// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package x509 parses X.509-encoded keys and certificates.
//
// On UNIX systems the environment variables SSL_CERT_FILE and SSL_CERT_DIR
// can be used to override the system default locations for the SSL certificate
// file and SSL certificate files directory, respectively.
//
// This is a fork of the go library crypto/x509 package, it's more relaxed
// about certificates that it'll accept, and exports the TBSCertificate
// structure.
package x509

import (
	"bytes"
	"crypto"
	"crypto/dsa"
	"crypto/ecdsa"
	"crypto/elliptic"
	"crypto/rsa"
	_ "crypto/sha1"
	_ "crypto/sha256"
	_ "crypto/sha512"
	"encoding/pem"
	"errors"
	"fmt"
	"io"
	"math/big"
	"net"
	"net/url"
	"strconv"
	"strings"
	"time"
	"unicode/utf8"

	cryptobyte_asn1 "golang.org/x/crypto/cryptobyte/asn1"

	"github.com/google/certificate-transparency-go/asn1"
	"github.com/google/certificate-transparency-go/tls"
	"github.com/google/certificate-transparency-go/x509/pkix"
	"golang.org/x/crypto/cryptobyte"
)

// pkixPublicKey reflects a PKIX public key structure. See SubjectPublicKeyInfo
// in RFC 3280.
type pkixPublicKey struct {
	Algo      pkix.AlgorithmIdentifier
	BitString asn1.BitString
}

// ParsePKIXPublicKey parses a DER encoded public key. These values are
// typically found in PEM blocks with "BEGIN PUBLIC KEY".
//
// Supported key types include RSA, DSA, and ECDSA. Unknown key
// types result in an error.
//
// On success, pub will be of type *rsa.PublicKey, *dsa.PublicKey,
// or *ecdsa.PublicKey.
func ParsePKIXPublicKey(derBytes []byte) (pub interface{}, err error) {
	var pki publicKeyInfo
	if rest, err := asn1.Unmarshal(derBytes, &pki); err != nil {
		return nil, err
	} else if len(rest) != 0 {
		return nil, errors.New("x509: trailing data after ASN.1 of public-key")
	}
	algo := getPublicKeyAlgorithmFromOID(pki.Algorithm.Algorithm)
	if algo == UnknownPublicKeyAlgorithm {
		return nil, errors.New("x509: unknown public key algorithm")
	}
	return parsePublicKey(algo, &pki)
}

func marshalPublicKey(pub interface{}) (publicKeyBytes []byte, publicKeyAlgorithm pkix.AlgorithmIdentifier, err error) {
	switch pub := pub.(type) {
	case *rsa.PublicKey:
		publicKeyBytes, err = asn1.Marshal(pkcs1PublicKey{
			N: pub.N,
			E: pub.E,
		})
		if err != nil {
			return nil, pkix.AlgorithmIdentifier{}, err
		}
		publicKeyAlgorithm.Algorithm = OIDPublicKeyRSA
		// This is a NULL parameters value which is required by
		// https://tools.ietf.org/html/rfc3279#section-2.3.1.
		publicKeyAlgorithm.Parameters = asn1.NullRawValue
	case *ecdsa.PublicKey:
		publicKeyBytes = elliptic.Marshal(pub.Curve, pub.X, pub.Y)
		oid, ok := OIDFromNamedCurve(pub.Curve)
		if !ok {
			return nil, pkix.AlgorithmIdentifier{}, errors.New("x509: unsupported elliptic curve")
		}
		publicKeyAlgorithm.Algorithm = OIDPublicKeyECDSA
		var paramBytes []byte
		paramBytes, err = asn1.Marshal(oid)
		if err != nil {
			return
		}
		publicKeyAlgorithm.Parameters.FullBytes = paramBytes
	default:
		return nil, pkix.AlgorithmIdentifier{}, errors.New("x509: only RSA and ECDSA public keys supported")
	}

	return publicKeyBytes, publicKeyAlgorithm, nil
}

// MarshalPKIXPublicKey serialises a public key to DER-encoded PKIX format.
func MarshalPKIXPublicKey(pub interface{}) ([]byte, error) {
	var publicKeyBytes []byte
	var publicKeyAlgorithm pkix.AlgorithmIdentifier
	var err error

	if publicKeyBytes, publicKeyAlgorithm, err = marshalPublicKey(pub); err != nil {
		return nil, err
	}

	pkix := pkixPublicKey{
		Algo: publicKeyAlgorithm,
		BitString: asn1.BitString{
			Bytes:     publicKeyBytes,
			BitLength: 8 * len(publicKeyBytes),
		},
	}

	ret, _ := asn1.Marshal(pkix)
	return ret, nil
}

// These structures reflect the ASN.1 structure of X.509 certificates.:

type certificate struct {
	Raw                asn1.RawContent
	TBSCertificate     tbsCertificate
	SignatureAlgorithm pkix.AlgorithmIdentifier
	SignatureValue     asn1.BitString
}

type tbsCertificate struct {
	Raw                asn1.RawContent
	Version            int `asn1:"optional,explicit,default:0,tag:0"`
	SerialNumber       *big.Int
	SignatureAlgorithm pkix.AlgorithmIdentifier
	Issuer             asn1.RawValue
	Validity           validity
	Subject            asn1.RawValue
	PublicKey          publicKeyInfo
	UniqueId           asn1.BitString   `asn1:"optional,tag:1"`
	SubjectUniqueId    asn1.BitString   `asn1:"optional,tag:2"`
	Extensions         []pkix.Extension `asn1:"optional,explicit,tag:3"`
}

type dsaAlgorithmParameters struct {
	P, Q, G *big.Int
}

type dsaSignature struct {
	R, S *big.Int
}

type ecdsaSignature dsaSignature

type validity struct {
	NotBefore, NotAfter time.Time
}

type publicKeyInfo struct {
	Raw       asn1.RawContent
	Algorithm pkix.AlgorithmIdentifier
	PublicKey asn1.BitString
}

// RFC 5280,  4.2.1.1
type authKeyId struct {
	Id []byte `asn1:"optional,tag:0"`
}

// SignatureAlgorithm indicates the algorithm used to sign a certificate.
type SignatureAlgorithm int

// SignatureAlgorithm values:
const (
	UnknownSignatureAlgorithm SignatureAlgorithm = iota
	MD2WithRSA
	MD5WithRSA
	SHA1WithRSA
	SHA256WithRSA
	SHA384WithRSA
	SHA512WithRSA
	DSAWithSHA1
	DSAWithSHA256
	ECDSAWithSHA1
	ECDSAWithSHA256
	ECDSAWithSHA384
	ECDSAWithSHA512
	SHA256WithRSAPSS
	SHA384WithRSAPSS
	SHA512WithRSAPSS
)

func (algo SignatureAlgorithm) isRSAPSS() bool {
	switch algo {
	case SHA256WithRSAPSS, SHA384WithRSAPSS, SHA512WithRSAPSS:
		return true
	default:
		return false
	}
}

func (algo SignatureAlgorithm) String() string {
	for _, details := range signatureAlgorithmDetails {
		if details.algo == algo {
			return details.name
		}
	}
	return strconv.Itoa(int(algo))
}

// PublicKeyAlgorithm indicates the algorithm used for a certificate's public key.
type PublicKeyAlgorithm int

// PublicKeyAlgorithm values:
const (
	UnknownPublicKeyAlgorithm PublicKeyAlgorithm = iota
	RSA
	DSA
	ECDSA
)

var publicKeyAlgoName = [...]string{
	RSA:   "RSA",
	DSA:   "DSA",
	ECDSA: "ECDSA",
}

func (algo PublicKeyAlgorithm) String() string {
	if 0 < algo && int(algo) < len(publicKeyAlgoName) {
		return publicKeyAlgoName[algo]
	}
	return strconv.Itoa(int(algo))
}

// OIDs for signature algorithms
//
// pkcs-1 OBJECT IDENTIFIER ::= {
//    iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) 1 }
//
//
// RFC 3279 2.2.1 RSA Signature Algorithms
//
// md2WithRSAEncryption OBJECT IDENTIFIER ::= { pkcs-1 2 }
//
// md5WithRSAEncryption OBJECT IDENTIFIER ::= { pkcs-1 4 }
//
// sha-1WithRSAEncryption OBJECT IDENTIFIER ::= { pkcs-1 5 }
//
// dsaWithSha1 OBJECT IDENTIFIER ::= {
//    iso(1) member-body(2) us(840) x9-57(10040) x9cm(4) 3 }
//
// RFC 3279 2.2.3 ECDSA Signature Algorithm
//
// ecdsa-with-SHA1 OBJECT IDENTIFIER ::= {
// 	  iso(1) member-body(2) us(840) ansi-x962(10045)
//    signatures(4) ecdsa-with-SHA1(1)}
//
//
// RFC 4055 5 PKCS #1 Version 1.5
//
// sha256WithRSAEncryption OBJECT IDENTIFIER ::= { pkcs-1 11 }
//
// sha384WithRSAEncryption OBJECT IDENTIFIER ::= { pkcs-1 12 }
//
// sha512WithRSAEncryption OBJECT IDENTIFIER ::= { pkcs-1 13 }
//
//
// RFC 5758 3.1 DSA Signature Algorithms
//
// dsaWithSha256 OBJECT IDENTIFIER ::= {
//    joint-iso-ccitt(2) country(16) us(840) organization(1) gov(101)
//    csor(3) algorithms(4) id-dsa-with-sha2(3) 2}
//
// RFC 5758 3.2 ECDSA Signature Algorithm
//
// ecdsa-with-SHA256 OBJECT IDENTIFIER ::= { iso(1) member-body(2)
//    us(840) ansi-X9-62(10045) signatures(4) ecdsa-with-SHA2(3) 2 }
//
// ecdsa-with-SHA384 OBJECT IDENTIFIER ::= { iso(1) member-body(2)
//    us(840) ansi-X9-62(10045) signatures(4) ecdsa-with-SHA2(3) 3 }
//
// ecdsa-with-SHA512 OBJECT IDENTIFIER ::= { iso(1) member-body(2)
//    us(840) ansi-X9-62(10045) signatures(4) ecdsa-with-SHA2(3) 4 }

var (
	oidSignatureMD2WithRSA      = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 2}
	oidSignatureMD5WithRSA      = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 4}
	oidSignatureSHA1WithRSA     = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 5}
	oidSignatureSHA256WithRSA   = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 11}
	oidSignatureSHA384WithRSA   = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 12}
	oidSignatureSHA512WithRSA   = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 13}
	oidSignatureRSAPSS          = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 10}
	oidSignatureDSAWithSHA1     = asn1.ObjectIdentifier{1, 2, 840, 10040, 4, 3}
	oidSignatureDSAWithSHA256   = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 3, 2}
	oidSignatureECDSAWithSHA1   = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 1}
	oidSignatureECDSAWithSHA256 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 2}
	oidSignatureECDSAWithSHA384 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 3}
	oidSignatureECDSAWithSHA512 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 4}

	oidSHA256 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 1}
	oidSHA384 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 2}
	oidSHA512 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 3}

	oidMGF1 = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 8}

	// oidISOSignatureSHA1WithRSA means the same as oidSignatureSHA1WithRSA
	// but it's specified by ISO. Microsoft's makecert.exe has been known
	// to produce certificates with this OID.
	oidISOSignatureSHA1WithRSA = asn1.ObjectIdentifier{1, 3, 14, 3, 2, 29}
)

var signatureAlgorithmDetails = []struct {
	algo       SignatureAlgorithm
	name       string
	oid        asn1.ObjectIdentifier
	pubKeyAlgo PublicKeyAlgorithm
	hash       crypto.Hash
}{
	{MD2WithRSA, "MD2-RSA", oidSignatureMD2WithRSA, RSA, crypto.Hash(0) /* no value for MD2 */},
	{MD5WithRSA, "MD5-RSA", oidSignatureMD5WithRSA, RSA, crypto.MD5},
	{SHA1WithRSA, "SHA1-RSA", oidSignatureSHA1WithRSA, RSA, crypto.SHA1},
	{SHA1WithRSA, "SHA1-RSA", oidISOSignatureSHA1WithRSA, RSA, crypto.SHA1},
	{SHA256WithRSA, "SHA256-RSA", oidSignatureSHA256WithRSA, RSA, crypto.SHA256},
	{SHA384WithRSA, "SHA384-RSA", oidSignatureSHA384WithRSA, RSA, crypto.SHA384},
	{SHA512WithRSA, "SHA512-RSA", oidSignatureSHA512WithRSA, RSA, crypto.SHA512},
	{SHA256WithRSAPSS, "SHA256-RSAPSS", oidSignatureRSAPSS, RSA, crypto.SHA256},
	{SHA384WithRSAPSS, "SHA384-RSAPSS", oidSignatureRSAPSS, RSA, crypto.SHA384},
	{SHA512WithRSAPSS, "SHA512-RSAPSS", oidSignatureRSAPSS, RSA, crypto.SHA512},
	{DSAWithSHA1, "DSA-SHA1", oidSignatureDSAWithSHA1, DSA, crypto.SHA1},
	{DSAWithSHA256, "DSA-SHA256", oidSignatureDSAWithSHA256, DSA, crypto.SHA256},
	{ECDSAWithSHA1, "ECDSA-SHA1", oidSignatureECDSAWithSHA1, ECDSA, crypto.SHA1},
	{ECDSAWithSHA256, "ECDSA-SHA256", oidSignatureECDSAWithSHA256, ECDSA, crypto.SHA256},
	{ECDSAWithSHA384, "ECDSA-SHA384", oidSignatureECDSAWithSHA384, ECDSA, crypto.SHA384},
	{ECDSAWithSHA512, "ECDSA-SHA512", oidSignatureECDSAWithSHA512, ECDSA, crypto.SHA512},
}

// pssParameters reflects the parameters in an AlgorithmIdentifier that
// specifies RSA PSS. See https://tools.ietf.org/html/rfc3447#appendix-A.2.3
type pssParameters struct {
	// The following three fields are not marked as
	// optional because the default values specify SHA-1,
	// which is no longer suitable for use in signatures.
	Hash         pkix.AlgorithmIdentifier `asn1:"explicit,tag:0"`
	MGF          pkix.AlgorithmIdentifier `asn1:"explicit,tag:1"`
	SaltLength   int                      `asn1:"explicit,tag:2"`
	TrailerField int                      `asn1:"optional,explicit,tag:3,default:1"`
}

// rsaPSSParameters returns an asn1.RawValue suitable for use as the Parameters
// in an AlgorithmIdentifier that specifies RSA PSS.
func rsaPSSParameters(hashFunc crypto.Hash) asn1.RawValue {
	var hashOID asn1.ObjectIdentifier

	switch hashFunc {
	case crypto.SHA256:
		hashOID = oidSHA256
	case crypto.SHA384:
		hashOID = oidSHA384
	case crypto.SHA512:
		hashOID = oidSHA512
	}

	params := pssParameters{
		Hash: pkix.AlgorithmIdentifier{
			Algorithm:  hashOID,
			Parameters: asn1.NullRawValue,
		},
		MGF: pkix.AlgorithmIdentifier{
			Algorithm: oidMGF1,
		},
		SaltLength:   hashFunc.Size(),
		TrailerField: 1,
	}

	mgf1Params := pkix.AlgorithmIdentifier{
		Algorithm:  hashOID,
		Parameters: asn1.NullRawValue,
	}

	var err error
	params.MGF.Parameters.FullBytes, err = asn1.Marshal(mgf1Params)
	if err != nil {
		panic(err)
	}

	serialized, err := asn1.Marshal(params)
	if err != nil {
		panic(err)
	}

	return asn1.RawValue{FullBytes: serialized}
}

// SignatureAlgorithmFromAI converts an PKIX algorithm identifier to the
// equivalent local constant.
func SignatureAlgorithmFromAI(ai pkix.AlgorithmIdentifier) SignatureAlgorithm {
	if !ai.Algorithm.Equal(oidSignatureRSAPSS) {
		for _, details := range signatureAlgorithmDetails {
			if ai.Algorithm.Equal(details.oid) {
				return details.algo
			}
		}
		return UnknownSignatureAlgorithm
	}

	// RSA PSS is special because it encodes important parameters
	// in the Parameters.

	var params pssParameters
	if _, err := asn1.Unmarshal(ai.Parameters.FullBytes, &params); err != nil {
		return UnknownSignatureAlgorithm
	}

	var mgf1HashFunc pkix.AlgorithmIdentifier
	if _, err := asn1.Unmarshal(params.MGF.Parameters.FullBytes, &mgf1HashFunc); err != nil {
		return UnknownSignatureAlgorithm
	}

	// PSS is greatly overburdened with options. This code forces
	// them into three buckets by requiring that the MGF1 hash
	// function always match the message hash function (as
	// recommended in
	// https://tools.ietf.org/html/rfc3447#section-8.1), that the
	// salt length matches the hash length, and that the trailer
	// field has the default value.
	if !bytes.Equal(params.Hash.Parameters.FullBytes, asn1.NullBytes) ||
		!params.MGF.Algorithm.Equal(oidMGF1) ||
		!mgf1HashFunc.Algorithm.Equal(params.Hash.Algorithm) ||
		!bytes.Equal(mgf1HashFunc.Parameters.FullBytes, asn1.NullBytes) ||
		params.TrailerField != 1 {
		return UnknownSignatureAlgorithm
	}

	switch {
	case params.Hash.Algorithm.Equal(oidSHA256) && params.SaltLength == 32:
		return SHA256WithRSAPSS
	case params.Hash.Algorithm.Equal(oidSHA384) && params.SaltLength == 48:
		return SHA384WithRSAPSS
	case params.Hash.Algorithm.Equal(oidSHA512) && params.SaltLength == 64:
		return SHA512WithRSAPSS
	}

	return UnknownSignatureAlgorithm
}

// RFC 3279, 2.3 Public Key Algorithms
//
// pkcs-1 OBJECT IDENTIFIER ::== { iso(1) member-body(2) us(840)
//    rsadsi(113549) pkcs(1) 1 }
//
// rsaEncryption OBJECT IDENTIFIER ::== { pkcs1-1 1 }
//
// id-dsa OBJECT IDENTIFIER ::== { iso(1) member-body(2) us(840)
//    x9-57(10040) x9cm(4) 1 }
//
// RFC 5480, 2.1.1 Unrestricted Algorithm Identifier and Parameters
//
// id-ecPublicKey OBJECT IDENTIFIER ::= {
//       iso(1) member-body(2) us(840) ansi-X9-62(10045) keyType(2) 1 }
var (
	OIDPublicKeyRSA         = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 1}
	OIDPublicKeyDSA         = asn1.ObjectIdentifier{1, 2, 840, 10040, 4, 1}
	OIDPublicKeyECDSA       = asn1.ObjectIdentifier{1, 2, 840, 10045, 2, 1}
	OIDPublicKeyRSAObsolete = asn1.ObjectIdentifier{2, 5, 8, 1, 1}
)

func getPublicKeyAlgorithmFromOID(oid asn1.ObjectIdentifier) PublicKeyAlgorithm {
	switch {
	case oid.Equal(OIDPublicKeyRSA):
		return RSA
	case oid.Equal(OIDPublicKeyDSA):
		return DSA
	case oid.Equal(OIDPublicKeyECDSA):
		return ECDSA
	}
	return UnknownPublicKeyAlgorithm
}

// RFC 5480, 2.1.1.1. Named Curve
//
// secp224r1 OBJECT IDENTIFIER ::= {
//   iso(1) identified-organization(3) certicom(132) curve(0) 33 }
//
// secp256r1 OBJECT IDENTIFIER ::= {
//   iso(1) member-body(2) us(840) ansi-X9-62(10045) curves(3)
//   prime(1) 7 }
//
// secp384r1 OBJECT IDENTIFIER ::= {
//   iso(1) identified-organization(3) certicom(132) curve(0) 34 }
//
// secp521r1 OBJECT IDENTIFIER ::= {
//   iso(1) identified-organization(3) certicom(132) curve(0) 35 }
//
// NB: secp256r1 is equivalent to prime256v1
var (
	OIDNamedCurveP224 = asn1.ObjectIdentifier{1, 3, 132, 0, 33}
	OIDNamedCurveP256 = asn1.ObjectIdentifier{1, 2, 840, 10045, 3, 1, 7}
	OIDNamedCurveP384 = asn1.ObjectIdentifier{1, 3, 132, 0, 34}
	OIDNamedCurveP521 = asn1.ObjectIdentifier{1, 3, 132, 0, 35}
)

func namedCurveFromOID(oid asn1.ObjectIdentifier) elliptic.Curve {
	switch {
	case oid.Equal(OIDNamedCurveP224):
		return elliptic.P224()
	case oid.Equal(OIDNamedCurveP256):
		return elliptic.P256()
	case oid.Equal(OIDNamedCurveP384):
		return elliptic.P384()
	case oid.Equal(OIDNamedCurveP521):
		return elliptic.P521()
	}
	return nil
}

// OIDFromNamedCurve returns the OID used to specify the use of the given
// elliptic curve.
func OIDFromNamedCurve(curve elliptic.Curve) (asn1.ObjectIdentifier, bool) {
	switch curve {
	case elliptic.P224():
		return OIDNamedCurveP224, true
	case elliptic.P256():
		return OIDNamedCurveP256, true
	case elliptic.P384():
		return OIDNamedCurveP384, true
	case elliptic.P521():
		return OIDNamedCurveP521, true
	}

	return nil, false
}

// KeyUsage represents the set of actions that are valid for a given key. It's
// a bitmap of the KeyUsage* constants.
type KeyUsage int

// KeyUsage values:
const (
	KeyUsageDigitalSignature KeyUsage = 1 << iota
	KeyUsageContentCommitment
	KeyUsageKeyEncipherment
	KeyUsageDataEncipherment
	KeyUsageKeyAgreement
	KeyUsageCertSign
	KeyUsageCRLSign
	KeyUsageEncipherOnly
	KeyUsageDecipherOnly
)

// RFC 5280, 4.2.1.12  Extended Key Usage
//
// anyExtendedKeyUsage OBJECT IDENTIFIER ::= { id-ce-extKeyUsage 0 }
//
// id-kp OBJECT IDENTIFIER ::= { id-pkix 3 }
//
// id-kp-serverAuth             OBJECT IDENTIFIER ::= { id-kp 1 }
// id-kp-clientAuth             OBJECT IDENTIFIER ::= { id-kp 2 }
// id-kp-codeSigning            OBJECT IDENTIFIER ::= { id-kp 3 }
// id-kp-emailProtection        OBJECT IDENTIFIER ::= { id-kp 4 }
// id-kp-timeStamping           OBJECT IDENTIFIER ::= { id-kp 8 }
// id-kp-OCSPSigning            OBJECT IDENTIFIER ::= { id-kp 9 }
var (
	oidExtKeyUsageAny                            = asn1.ObjectIdentifier{2, 5, 29, 37, 0}
	oidExtKeyUsageServerAuth                     = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 1}
	oidExtKeyUsageClientAuth                     = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 2}
	oidExtKeyUsageCodeSigning                    = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 3}
	oidExtKeyUsageEmailProtection                = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 4}
	oidExtKeyUsageIPSECEndSystem                 = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 5}
	oidExtKeyUsageIPSECTunnel                    = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 6}
	oidExtKeyUsageIPSECUser                      = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 7}
	oidExtKeyUsageTimeStamping                   = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 8}
	oidExtKeyUsageOCSPSigning                    = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 9}
	oidExtKeyUsageMicrosoftServerGatedCrypto     = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 311, 10, 3, 3}
	oidExtKeyUsageNetscapeServerGatedCrypto      = asn1.ObjectIdentifier{2, 16, 840, 1, 113730, 4, 1}
	oidExtKeyUsageMicrosoftCommercialCodeSigning = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 311, 2, 1, 22}
	oidExtKeyUsageMicrosoftKernelCodeSigning     = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 311, 61, 1, 1}
	// RFC 6962 s3.1
	oidExtKeyUsageCertificateTransparency = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 11129, 2, 4, 4}
)

// ExtKeyUsage represents an extended set of actions that are valid for a given key.
// Each of the ExtKeyUsage* constants define a unique action.
type ExtKeyUsage int

// ExtKeyUsage values:
const (
	ExtKeyUsageAny ExtKeyUsage = iota
	ExtKeyUsageServerAuth
	ExtKeyUsageClientAuth
	ExtKeyUsageCodeSigning
	ExtKeyUsageEmailProtection
	ExtKeyUsageIPSECEndSystem
	ExtKeyUsageIPSECTunnel
	ExtKeyUsageIPSECUser
	ExtKeyUsageTimeStamping
	ExtKeyUsageOCSPSigning
	ExtKeyUsageMicrosoftServerGatedCrypto
	ExtKeyUsageNetscapeServerGatedCrypto
	ExtKeyUsageMicrosoftCommercialCodeSigning
	ExtKeyUsageMicrosoftKernelCodeSigning
	ExtKeyUsageCertificateTransparency
)

// extKeyUsageOIDs contains the mapping between an ExtKeyUsage and its OID.
var extKeyUsageOIDs = []struct {
	extKeyUsage ExtKeyUsage
	oid         asn1.ObjectIdentifier
}{
	{ExtKeyUsageAny, oidExtKeyUsageAny},
	{ExtKeyUsageServerAuth, oidExtKeyUsageServerAuth},
	{ExtKeyUsageClientAuth, oidExtKeyUsageClientAuth},
	{ExtKeyUsageCodeSigning, oidExtKeyUsageCodeSigning},
	{ExtKeyUsageEmailProtection, oidExtKeyUsageEmailProtection},
	{ExtKeyUsageIPSECEndSystem, oidExtKeyUsageIPSECEndSystem},
	{ExtKeyUsageIPSECTunnel, oidExtKeyUsageIPSECTunnel},
	{ExtKeyUsageIPSECUser, oidExtKeyUsageIPSECUser},
	{ExtKeyUsageTimeStamping, oidExtKeyUsageTimeStamping},
	{ExtKeyUsageOCSPSigning, oidExtKeyUsageOCSPSigning},
	{ExtKeyUsageMicrosoftServerGatedCrypto, oidExtKeyUsageMicrosoftServerGatedCrypto},
	{ExtKeyUsageNetscapeServerGatedCrypto, oidExtKeyUsageNetscapeServerGatedCrypto},
	{ExtKeyUsageMicrosoftCommercialCodeSigning, oidExtKeyUsageMicrosoftCommercialCodeSigning},
	{ExtKeyUsageMicrosoftKernelCodeSigning, oidExtKeyUsageMicrosoftKernelCodeSigning},
	{ExtKeyUsageCertificateTransparency, oidExtKeyUsageCertificateTransparency},
}

func extKeyUsageFromOID(oid asn1.ObjectIdentifier) (eku ExtKeyUsage, ok bool) {
	for _, pair := range extKeyUsageOIDs {
		if oid.Equal(pair.oid) {
			return pair.extKeyUsage, true
		}
	}
	return
}

func oidFromExtKeyUsage(eku ExtKeyUsage) (oid asn1.ObjectIdentifier, ok bool) {
	for _, pair := range extKeyUsageOIDs {
		if eku == pair.extKeyUsage {
			return pair.oid, true
		}
	}
	return
}

// SerializedSCT represents a single TLS-encoded signed certificate timestamp, from RFC6962 s3.3.
type SerializedSCT struct {
	Val []byte `tls:"minlen:1,maxlen:65535"`
}

// SignedCertificateTimestampList is a list of signed certificate timestamps, from RFC6962 s3.3.
type SignedCertificateTimestampList struct {
	SCTList []SerializedSCT `tls:"minlen:1,maxlen:65335"`
}

// A Certificate represents an X.509 certificate.
type Certificate struct {
	Raw                     []byte // Complete ASN.1 DER content (certificate, signature algorithm and signature).
	RawTBSCertificate       []byte // Certificate part of raw ASN.1 DER content.
	RawSubjectPublicKeyInfo []byte // DER encoded SubjectPublicKeyInfo.
	RawSubject              []byte // DER encoded Subject
	RawIssuer               []byte // DER encoded Issuer

	Signature          []byte
	SignatureAlgorithm SignatureAlgorithm

	PublicKeyAlgorithm PublicKeyAlgorithm
	PublicKey          interface{}

	Version             int
	SerialNumber        *big.Int
	Issuer              pkix.Name
	Subject             pkix.Name
	NotBefore, NotAfter time.Time // Validity bounds.
	KeyUsage            KeyUsage

	// Extensions contains raw X.509 extensions. When parsing certificates,
	// this can be used to extract non-critical extensions that are not
	// parsed by this package. When marshaling certificates, the Extensions
	// field is ignored, see ExtraExtensions.
	Extensions []pkix.Extension

	// ExtraExtensions contains extensions to be copied, raw, into any
	// marshaled certificates. Values override any extensions that would
	// otherwise be produced based on the other fields. The ExtraExtensions
	// field is not populated when parsing certificates, see Extensions.
	ExtraExtensions []pkix.Extension

	// UnhandledCriticalExtensions contains a list of extension IDs that
	// were not (fully) processed when parsing. Verify will fail if this
	// slice is non-empty, unless verification is delegated to an OS
	// library which understands all the critical extensions.
	//
	// Users can access these extensions using Extensions and can remove
	// elements from this slice if they believe that they have been
	// handled.
	UnhandledCriticalExtensions []asn1.ObjectIdentifier

	ExtKeyUsage        []ExtKeyUsage           // Sequence of extended key usages.
	UnknownExtKeyUsage []asn1.ObjectIdentifier // Encountered extended key usages unknown to this package.

	// BasicConstraintsValid indicates whether IsCA, MaxPathLen,
	// and MaxPathLenZero are valid.
	BasicConstraintsValid bool
	IsCA                  bool

	// MaxPathLen and MaxPathLenZero indicate the presence and
	// value of the BasicConstraints' "pathLenConstraint".
	//
	// When parsing a certificate, a positive non-zero MaxPathLen
	// means that the field was specified, -1 means it was unset,
	// and MaxPathLenZero being true mean that the field was
	// explicitly set to zero. The case of MaxPathLen==0 with MaxPathLenZero==false
	// should be treated equivalent to -1 (unset).
	//
	// When generating a certificate, an unset pathLenConstraint
	// can be requested with either MaxPathLen == -1 or using the
	// zero value for both MaxPathLen and MaxPathLenZero.
	MaxPathLen int
	// MaxPathLenZero indicates that BasicConstraintsValid==true
	// and MaxPathLen==0 should be interpreted as an actual
	// maximum path length of zero. Otherwise, that combination is
	// interpreted as MaxPathLen not being set.
	MaxPathLenZero bool

	SubjectKeyId   []byte
	AuthorityKeyId []byte

	// RFC 5280, 4.2.2.1 (Authority Information Access)
	OCSPServer            []string
	IssuingCertificateURL []string

	// Subject Alternate Name values
	DNSNames       []string
	EmailAddresses []string
	IPAddresses    []net.IP
	URIs           []*url.URL

	// Name constraints
	PermittedDNSDomainsCritical bool // if true then the name constraints are marked critical.
	PermittedDNSDomains         []string
	ExcludedDNSDomains          []string
	PermittedIPRanges           []*net.IPNet
	ExcludedIPRanges            []*net.IPNet
	PermittedEmailAddresses     []string
	ExcludedEmailAddresses      []string
	PermittedURIDomains         []string
	ExcludedURIDomains          []string

	// CRL Distribution Points
	CRLDistributionPoints []string

	PolicyIdentifiers []asn1.ObjectIdentifier

	// Certificate Transparency SCT extension contents; this is a TLS-encoded
	// SignedCertificateTimestampList (RFC 6962 s3.3).
	RawSCT  []byte
	SCTList SignedCertificateTimestampList
}

// ErrUnsupportedAlgorithm results from attempting to perform an operation that
// involves algorithms that are not currently implemented.
var ErrUnsupportedAlgorithm = errors.New("x509: cannot verify signature: algorithm unimplemented")

// InsecureAlgorithmError results when the signature algorithm for a certificate
// is known to be insecure.
type InsecureAlgorithmError SignatureAlgorithm

func (e InsecureAlgorithmError) Error() string {
	return fmt.Sprintf("x509: cannot verify signature: insecure algorithm %v", SignatureAlgorithm(e))
}

// ConstraintViolationError results when a requested usage is not permitted by
// a certificate. For example: checking a signature when the public key isn't a
// certificate signing key.
type ConstraintViolationError struct{}

func (ConstraintViolationError) Error() string {
	return "x509: invalid signature: parent certificate cannot sign this kind of certificate"
}

// Equal indicates whether two Certificate objects are equal (by comparing their
// DER-encoded values).
func (c *Certificate) Equal(other *Certificate) bool {
	return bytes.Equal(c.Raw, other.Raw)
}

func (c *Certificate) hasSANExtension() bool {
	return oidInExtensions(OIDExtensionSubjectAltName, c.Extensions)
}

// Entrust have a broken root certificate (CN=Entrust.net Certification
// Authority (2048)) which isn't marked as a CA certificate and is thus invalid
// according to PKIX.
// We recognise this certificate by its SubjectPublicKeyInfo and exempt it
// from the Basic Constraints requirement.
// See http://www.entrust.net/knowledge-base/technote.cfm?tn=7869
//
// TODO(agl): remove this hack once their reissued root is sufficiently
// widespread.
var entrustBrokenSPKI = []byte{
	0x30, 0x82, 0x01, 0x22, 0x30, 0x0d, 0x06, 0x09,
	0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01,
	0x01, 0x05, 0x00, 0x03, 0x82, 0x01, 0x0f, 0x00,
	0x30, 0x82, 0x01, 0x0a, 0x02, 0x82, 0x01, 0x01,
	0x00, 0x97, 0xa3, 0x2d, 0x3c, 0x9e, 0xde, 0x05,
	0xda, 0x13, 0xc2, 0x11, 0x8d, 0x9d, 0x8e, 0xe3,
	0x7f, 0xc7, 0x4b, 0x7e, 0x5a, 0x9f, 0xb3, 0xff,
	0x62, 0xab, 0x73, 0xc8, 0x28, 0x6b, 0xba, 0x10,
	0x64, 0x82, 0x87, 0x13, 0xcd, 0x57, 0x18, 0xff,
	0x28, 0xce, 0xc0, 0xe6, 0x0e, 0x06, 0x91, 0x50,
	0x29, 0x83, 0xd1, 0xf2, 0xc3, 0x2a, 0xdb, 0xd8,
	0xdb, 0x4e, 0x04, 0xcc, 0x00, 0xeb, 0x8b, 0xb6,
	0x96, 0xdc, 0xbc, 0xaa, 0xfa, 0x52, 0x77, 0x04,
	0xc1, 0xdb, 0x19, 0xe4, 0xae, 0x9c, 0xfd, 0x3c,
	0x8b, 0x03, 0xef, 0x4d, 0xbc, 0x1a, 0x03, 0x65,
	0xf9, 0xc1, 0xb1, 0x3f, 0x72, 0x86, 0xf2, 0x38,
	0xaa, 0x19, 0xae, 0x10, 0x88, 0x78, 0x28, 0xda,
	0x75, 0xc3, 0x3d, 0x02, 0x82, 0x02, 0x9c, 0xb9,
	0xc1, 0x65, 0x77, 0x76, 0x24, 0x4c, 0x98, 0xf7,
	0x6d, 0x31, 0x38, 0xfb, 0xdb, 0xfe, 0xdb, 0x37,
	0x02, 0x76, 0xa1, 0x18, 0x97, 0xa6, 0xcc, 0xde,
	0x20, 0x09, 0x49, 0x36, 0x24, 0x69, 0x42, 0xf6,
	0xe4, 0x37, 0x62, 0xf1, 0x59, 0x6d, 0xa9, 0x3c,
	0xed, 0x34, 0x9c, 0xa3, 0x8e, 0xdb, 0xdc, 0x3a,
	0xd7, 0xf7, 0x0a, 0x6f, 0xef, 0x2e, 0xd8, 0xd5,
	0x93, 0x5a, 0x7a, 0xed, 0x08, 0x49, 0x68, 0xe2,
	0x41, 0xe3, 0x5a, 0x90, 0xc1, 0x86, 0x55, 0xfc,
	0x51, 0x43, 0x9d, 0xe0, 0xb2, 0xc4, 0x67, 0xb4,
	0xcb, 0x32, 0x31, 0x25, 0xf0, 0x54, 0x9f, 0x4b,
	0xd1, 0x6f, 0xdb, 0xd4, 0xdd, 0xfc, 0xaf, 0x5e,
	0x6c, 0x78, 0x90, 0x95, 0xde, 0xca, 0x3a, 0x48,
	0xb9, 0x79, 0x3c, 0x9b, 0x19, 0xd6, 0x75, 0x05,
	0xa0, 0xf9, 0x88, 0xd7, 0xc1, 0xe8, 0xa5, 0x09,
	0xe4, 0x1a, 0x15, 0xdc, 0x87, 0x23, 0xaa, 0xb2,
	0x75, 0x8c, 0x63, 0x25, 0x87, 0xd8, 0xf8, 0x3d,
	0xa6, 0xc2, 0xcc, 0x66, 0xff, 0xa5, 0x66, 0x68,
	0x55, 0x02, 0x03, 0x01, 0x00, 0x01,
}

// CheckSignatureFrom verifies that the signature on c is a valid signature
// from parent.
func (c *Certificate) CheckSignatureFrom(parent *Certificate) error {
	// RFC 5280, 4.2.1.9:
	// "If the basic constraints extension is not present in a version 3
	// certificate, or the extension is present but the cA boolean is not
	// asserted, then the certified public key MUST NOT be used to verify
	// certificate signatures."
	// (except for Entrust, see comment above entrustBrokenSPKI)
	if (parent.Version == 3 && !parent.BasicConstraintsValid ||
		parent.BasicConstraintsValid && !parent.IsCA) &&
		!bytes.Equal(c.RawSubjectPublicKeyInfo, entrustBrokenSPKI) {
		return ConstraintViolationError{}
	}

	if parent.KeyUsage != 0 && parent.KeyUsage&KeyUsageCertSign == 0 {
		return ConstraintViolationError{}
	}

	if parent.PublicKeyAlgorithm == UnknownPublicKeyAlgorithm {
		return ErrUnsupportedAlgorithm
	}

	// TODO(agl): don't ignore the path length constraint.

	return parent.CheckSignature(c.SignatureAlgorithm, c.RawTBSCertificate, c.Signature)
}

// CheckSignature verifies that signature is a valid signature over signed from
// c's public key.
func (c *Certificate) CheckSignature(algo SignatureAlgorithm, signed, signature []byte) error {
	return checkSignature(algo, signed, signature, c.PublicKey)
}

func (c *Certificate) hasNameConstraints() bool {
	for _, e := range c.Extensions {
		if len(e.Id) == 4 && e.Id[0] == OIDExtensionNameConstraints[0] && e.Id[1] == OIDExtensionNameConstraints[1] && e.Id[2] == OIDExtensionNameConstraints[2] && e.Id[3] == OIDExtensionNameConstraints[3] {
			return true
		}
	}

	return false
}

func (c *Certificate) getSANExtension() ([]byte, bool) {
	for _, e := range c.Extensions {
		if len(e.Id) == 4 && e.Id[0] == OIDExtensionSubjectAltName[0] && e.Id[1] == OIDExtensionSubjectAltName[1] && e.Id[2] == OIDExtensionSubjectAltName[2] && e.Id[3] == OIDExtensionSubjectAltName[3] {
			return e.Value, true
		}
	}

	return nil, false
}

func signaturePublicKeyAlgoMismatchError(expectedPubKeyAlgo PublicKeyAlgorithm, pubKey interface{}) error {
	return fmt.Errorf("x509: signature algorithm specifies an %s public key, but have public key of type %T", expectedPubKeyAlgo.String(), pubKey)
}

// CheckSignature verifies that signature is a valid signature over signed from
// a crypto.PublicKey.
func checkSignature(algo SignatureAlgorithm, signed, signature []byte, publicKey crypto.PublicKey) (err error) {
	var hashType crypto.Hash
	var pubKeyAlgo PublicKeyAlgorithm

	for _, details := range signatureAlgorithmDetails {
		if details.algo == algo {
			hashType = details.hash
			pubKeyAlgo = details.pubKeyAlgo
		}
	}

	switch hashType {
	case crypto.Hash(0):
		return ErrUnsupportedAlgorithm
	case crypto.MD5:
		return InsecureAlgorithmError(algo)
	}

	if !hashType.Available() {
		return ErrUnsupportedAlgorithm
	}
	h := hashType.New()

	h.Write(signed)
	digest := h.Sum(nil)

	switch pub := publicKey.(type) {
	case *rsa.PublicKey:
		if pubKeyAlgo != RSA {
			return signaturePublicKeyAlgoMismatchError(pubKeyAlgo, pub)
		}
		if algo.isRSAPSS() {
			return rsa.VerifyPSS(pub, hashType, digest, signature, &rsa.PSSOptions{SaltLength: rsa.PSSSaltLengthEqualsHash})
		} else {
			return rsa.VerifyPKCS1v15(pub, hashType, digest, signature)
		}
	case *dsa.PublicKey:
		if pubKeyAlgo != DSA {
			return signaturePublicKeyAlgoMismatchError(pubKeyAlgo, pub)
		}
		dsaSig := new(dsaSignature)
		if rest, err := asn1.Unmarshal(signature, dsaSig); err != nil {
			return err
		} else if len(rest) != 0 {
			return errors.New("x509: trailing data after DSA signature")
		}
		if dsaSig.R.Sign() <= 0 || dsaSig.S.Sign() <= 0 {
			return errors.New("x509: DSA signature contained zero or negative values")
		}
		if !dsa.Verify(pub, digest, dsaSig.R, dsaSig.S) {
			return errors.New("x509: DSA verification failure")
		}
		return
	case *ecdsa.PublicKey:
		if pubKeyAlgo != ECDSA {
			return signaturePublicKeyAlgoMismatchError(pubKeyAlgo, pub)
		}
		ecdsaSig := new(ecdsaSignature)
		if rest, err := asn1.Unmarshal(signature, ecdsaSig); err != nil {
			return err
		} else if len(rest) != 0 {
			return errors.New("x509: trailing data after ECDSA signature")
		}
		if ecdsaSig.R.Sign() <= 0 || ecdsaSig.S.Sign() <= 0 {
			return errors.New("x509: ECDSA signature contained zero or negative values")
		}
		if !ecdsa.Verify(pub, digest, ecdsaSig.R, ecdsaSig.S) {
			return errors.New("x509: ECDSA verification failure")
		}
		return
	}
	return ErrUnsupportedAlgorithm
}

// CheckCRLSignature checks that the signature in crl is from c.
func (c *Certificate) CheckCRLSignature(crl *pkix.CertificateList) error {
	algo := SignatureAlgorithmFromAI(crl.SignatureAlgorithm)
	return c.CheckSignature(algo, crl.TBSCertList.Raw, crl.SignatureValue.RightAlign())
}

// UnhandledCriticalExtension results when the certificate contains an extension
// that is marked as critical but which is not handled by this library.
type UnhandledCriticalExtension struct {
	ID asn1.ObjectIdentifier
}

func (h UnhandledCriticalExtension) Error() string {
	return fmt.Sprintf("x509: unhandled critical extension (%v)", h.ID)
}

// RemoveCTPoison takes a DER-encoded TBSCertificate and removes the CT poison
// extension (preserving the order of other extensions), and returns the result
// still as a DER-encoded TBSCertificate.  This function will fail if there is
// not exactly 1 CT poison extension present.
func RemoveCTPoison(tbsData []byte) ([]byte, error) {
	return BuildPrecertTBS(tbsData, nil)
}

// BuildPrecertTBS builds a Certificate Transparency pre-certificate (RFC 6962
// s3.1) from the given DER-encoded TBSCertificate, returning a DER-encoded
// TBSCertificate.
//
// This function removes the CT poison extension (there must be exactly 1 of
// these), preserving the order of other extensions.
//
// If preIssuer is provided, this should be a special intermediate certificate
// that was used to sign the precert (indicated by having the special
// CertificateTransparency extended key usage).  In this case, the issuance
// information of the pre-cert is updated to reflect the next issuer in the
// chain, i.e. the issuer of this special intermediate:
//  - The precert's Issuer is changed to the Issuer of the intermediate
//  - The precert's AuthorityKeyId is changed to the AuthorityKeyId of the
//    intermediate.
func BuildPrecertTBS(tbsData []byte, preIssuer *Certificate) ([]byte, error) {
	var tbs tbsCertificate
	rest, err := asn1.Unmarshal(tbsData, &tbs)
	if err != nil {
		return nil, fmt.Errorf("failed to parse TBSCertificate: %v", err)
	} else if rLen := len(rest); rLen > 0 {
		return nil, fmt.Errorf("trailing data (%d bytes) after TBSCertificate", rLen)
	}
	poisonAt := -1
	for i, ext := range tbs.Extensions {
		if ext.Id.Equal(OIDExtensionCTPoison) {
			if poisonAt != -1 {
				return nil, errors.New("multiple CT poison extensions present")
			}
			poisonAt = i
		}
	}
	if poisonAt == -1 {
		return nil, errors.New("no CT poison extension present")
	}
	tbs.Extensions = append(tbs.Extensions[:poisonAt], tbs.Extensions[poisonAt+1:]...)
	tbs.Raw = nil

	if preIssuer != nil {
		// Update the precert's Issuer field.  Use the RawIssuer rather than the
		// parsed Issuer to avoid any chance of ASN.1 differences (e.g. switching
		// from UTF8String to PrintableString).
		tbs.Issuer.FullBytes = preIssuer.RawIssuer

		// Also need to update the cert's AuthorityKeyID extension
		// to that of the preIssuer.
		var issuerKeyID []byte
		for _, ext := range preIssuer.Extensions {
			if ext.Id.Equal(OIDExtensionAuthorityKeyId) {
				issuerKeyID = ext.Value
				break
			}
		}

		// Check the preIssuer has the CT EKU.
		seenCTEKU := false
		for _, eku := range preIssuer.ExtKeyUsage {
			if eku == ExtKeyUsageCertificateTransparency {
				seenCTEKU = true
				break
			}
		}
		if !seenCTEKU {
			return nil, fmt.Errorf("issuer does not have CertificateTransparency extended key usage")
		}

		keyAt := -1
		for i, ext := range tbs.Extensions {
			if ext.Id.Equal(OIDExtensionAuthorityKeyId) {
				keyAt = i
				break
			}
		}
		if keyAt >= 0 {
			// PreCert has an auth-key-id; replace it with the value from the preIssuer
			if issuerKeyID != nil {
				tbs.Extensions[keyAt].Value = issuerKeyID
			} else {
				tbs.Extensions = append(tbs.Extensions[:keyAt], tbs.Extensions[keyAt+1:]...)
			}
		} else if issuerKeyID != nil {
			// PreCert did not have an auth-key-id, but the preIssuer does, so add it at the end.
			authKeyIDExt := pkix.Extension{
				Id:       OIDExtensionAuthorityKeyId,
				Critical: false,
				Value:    issuerKeyID,
			}
			tbs.Extensions = append(tbs.Extensions, authKeyIDExt)
		}
	}

	data, err := asn1.Marshal(tbs)
	if err != nil {
		return nil, fmt.Errorf("failed to re-marshal TBSCertificate: %v", err)
	}
	return data, nil
}

type basicConstraints struct {
	IsCA       bool `asn1:"optional"`
	MaxPathLen int  `asn1:"optional,default:-1"`
}

// RFC 5280, 4.2.1.4
type policyInformation struct {
	Policy asn1.ObjectIdentifier
	// policyQualifiers omitted
}

const (
	nameTypeEmail = 1
	nameTypeDNS   = 2
	nameTypeURI   = 6
	nameTypeIP    = 7
)

// RFC 5280, 4.2.2.1
type authorityInfoAccess struct {
	Method   asn1.ObjectIdentifier
	Location asn1.RawValue
}

// RFC 5280, 4.2.1.14
type distributionPoint struct {
	DistributionPoint distributionPointName `asn1:"optional,tag:0"`
	Reason            asn1.BitString        `asn1:"optional,tag:1"`
	CRLIssuer         asn1.RawValue         `asn1:"optional,tag:2"`
}

type distributionPointName struct {
	FullName     []asn1.RawValue  `asn1:"optional,tag:0"`
	RelativeName pkix.RDNSequence `asn1:"optional,tag:1"`
}

func parsePublicKey(algo PublicKeyAlgorithm, keyData *publicKeyInfo) (interface{}, error) {
	asn1Data := keyData.PublicKey.RightAlign()
	switch algo {
	case RSA:
		// RSA public keys must have a NULL in the parameters
		// (https://tools.ietf.org/html/rfc3279#section-2.3.1).
		if !bytes.Equal(keyData.Algorithm.Parameters.FullBytes, asn1.NullBytes) {
			return nil, errors.New("x509: RSA key missing NULL parameters")
		}

		p := new(pkcs1PublicKey)
		rest, err := asn1.Unmarshal(asn1Data, p)
		if err != nil {
			return nil, err
		}
		if len(rest) != 0 {
			return nil, errors.New("x509: trailing data after RSA public key")
		}

		if p.N.Sign() <= 0 {
			return nil, errors.New("x509: RSA modulus is not a positive number")
		}
		if p.E <= 0 {
			return nil, errors.New("x509: RSA public exponent is not a positive number")
		}

		pub := &rsa.PublicKey{
			E: p.E,
			N: p.N,
		}
		return pub, nil
	case DSA:
		var p *big.Int
		rest, err := asn1.Unmarshal(asn1Data, &p)
		if err != nil {
			return nil, err
		}
		if len(rest) != 0 {
			return nil, errors.New("x509: trailing data after DSA public key")
		}
		paramsData := keyData.Algorithm.Parameters.FullBytes
		params := new(dsaAlgorithmParameters)
		rest, err = asn1.Unmarshal(paramsData, params)
		if err != nil {
			return nil, err
		}
		if len(rest) != 0 {
			return nil, errors.New("x509: trailing data after DSA parameters")
		}
		if p.Sign() <= 0 || params.P.Sign() <= 0 || params.Q.Sign() <= 0 || params.G.Sign() <= 0 {
			return nil, errors.New("x509: zero or negative DSA parameter")
		}
		pub := &dsa.PublicKey{
			Parameters: dsa.Parameters{
				P: params.P,
				Q: params.Q,
				G: params.G,
			},
			Y: p,
		}
		return pub, nil
	case ECDSA:
		paramsData := keyData.Algorithm.Parameters.FullBytes
		namedCurveOID := new(asn1.ObjectIdentifier)
		rest, err := asn1.Unmarshal(paramsData, namedCurveOID)
		if err != nil {
			return nil, err
		}
		if len(rest) != 0 {
			return nil, errors.New("x509: trailing data after ECDSA parameters")
		}
		namedCurve := namedCurveFromOID(*namedCurveOID)
		if namedCurve == nil {
			return nil, errors.New("x509: unsupported elliptic curve")
		}
		x, y := elliptic.Unmarshal(namedCurve, asn1Data)
		if x == nil {
			return nil, errors.New("x509: failed to unmarshal elliptic curve point")
		}
		pub := &ecdsa.PublicKey{
			Curve: namedCurve,
			X:     x,
			Y:     y,
		}
		return pub, nil
	default:
		return nil, nil
	}
}

// NonFatalErrors is an error type which can hold a number of other errors.
// It's used to collect a range of non-fatal errors which occur while parsing
// a certificate, that way we can still match on certs which technically are
// invalid.
type NonFatalErrors struct {
	Errors []error
}

// Adds an error to the list of errors contained by NonFatalErrors.
func (e *NonFatalErrors) AddError(err error) {
	e.Errors = append(e.Errors, err)
}

// Returns a string consisting of the values of Error() from all of the errors
// contained in |e|
func (e NonFatalErrors) Error() string {
	r := "NonFatalErrors: "
	for _, err := range e.Errors {
		r += err.Error() + "; "
	}
	return r
}

// Returns true if |e| contains at least one error
func (e *NonFatalErrors) HasError() bool {
	return len(e.Errors) > 0
}

func parseDistributionPoints(data []byte, crldp *[]string) error {
	// CRLDistributionPoints ::= SEQUENCE SIZE (1..MAX) OF DistributionPoint
	//
	// DistributionPoint ::= SEQUENCE {
	//     distributionPoint       [0]     DistributionPointName OPTIONAL,
	//     reasons                 [1]     ReasonFlags OPTIONAL,
	//     cRLIssuer               [2]     GeneralNames OPTIONAL }
	//
	// DistributionPointName ::= CHOICE {
	//     fullName                [0]     GeneralNames,
	//     nameRelativeToCRLIssuer [1]     RelativeDistinguishedName }

	var cdp []distributionPoint
	if rest, err := asn1.Unmarshal(data, &cdp); err != nil {
		return err
	} else if len(rest) != 0 {
		return errors.New("x509: trailing data after X.509 CRL distribution point")
	}

	for _, dp := range cdp {
		// Per RFC 5280, 4.2.1.13, one of distributionPoint or cRLIssuer may be empty.
		if len(dp.DistributionPoint.FullName) == 0 {
			continue
		}

		for _, fullName := range dp.DistributionPoint.FullName {
			if fullName.Tag == 6 {
				*crldp = append(*crldp, string(fullName.Bytes))
			}
		}
	}
	return nil
}

func forEachSAN(extension []byte, callback func(tag int, data []byte) error) error {
	// RFC 5280, 4.2.1.6

	// SubjectAltName ::= GeneralNames
	//
	// GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
	//
	// GeneralName ::= CHOICE {
	//      otherName                       [0]     OtherName,
	//      rfc822Name                      [1]     IA5String,
	//      dNSName                         [2]     IA5String,
	//      x400Address                     [3]     ORAddress,
	//      directoryName                   [4]     Name,
	//      ediPartyName                    [5]     EDIPartyName,
	//      uniformResourceIdentifier       [6]     IA5String,
	//      iPAddress                       [7]     OCTET STRING,
	//      registeredID                    [8]     OBJECT IDENTIFIER }
	var seq asn1.RawValue
	rest, err := asn1.Unmarshal(extension, &seq)
	if err != nil {
		return err
	} else if len(rest) != 0 {
		return errors.New("x509: trailing data after X.509 extension")
	}
	if !seq.IsCompound || seq.Tag != asn1.TagSequence || seq.Class != asn1.ClassUniversal {
		return asn1.StructuralError{Msg: "bad SAN sequence"}
	}

	rest = seq.Bytes
	for len(rest) > 0 {
		var v asn1.RawValue
		rest, err = asn1.Unmarshal(rest, &v)
		if err != nil {
			return err
		}

		if err := callback(v.Tag, v.Bytes); err != nil {
			return err
		}
	}

	return nil
}

func parseSANExtension(value []byte, nfe *NonFatalErrors) (dnsNames, emailAddresses []string, ipAddresses []net.IP, uris []*url.URL, err error) {
	err = forEachSAN(value, func(tag int, data []byte) error {
		switch tag {
		case nameTypeEmail:
			mailbox := string(data)
			if _, ok := parseRFC2821Mailbox(mailbox); !ok {
				return fmt.Errorf("x509: cannot parse rfc822Name %q", mailbox)
			}
			emailAddresses = append(emailAddresses, mailbox)
		case nameTypeDNS:
			domain := string(data)
			if _, ok := domainToReverseLabels(domain); !ok {
				return fmt.Errorf("x509: cannot parse dnsName %q", string(data))
			}
			dnsNames = append(dnsNames, domain)
		case nameTypeURI:
			uri, err := url.Parse(string(data))
			if err != nil {
				return fmt.Errorf("x509: cannot parse URI %q: %s", string(data), err)
			}
			if len(uri.Host) > 0 {
				if _, ok := domainToReverseLabels(uri.Host); !ok {
					return fmt.Errorf("x509: cannot parse URI %q: invalid domain", string(data))
				}
			}
			uris = append(uris, uri)
		case nameTypeIP:
			switch len(data) {
			case net.IPv4len, net.IPv6len:
				ipAddresses = append(ipAddresses, data)
			default:
				nfe.AddError(fmt.Errorf("x509: certificate contained IP address of length %d : %v", len(data), data))
			}
		}

		return nil
	})

	return
}

// isValidIPMask returns true iff mask consists of zero or more 1 bits, followed by zero bits.
func isValidIPMask(mask []byte) bool {
	seenZero := false

	for _, b := range mask {
		if seenZero {
			if b != 0 {
				return false
			}

			continue
		}

		switch b {
		case 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe:
			seenZero = true
		case 0xff:
		default:
			return false
		}
	}

	return true
}

func parseNameConstraintsExtension(out *Certificate, e pkix.Extension) (unhandled bool, err error) {
	// RFC 5280, 4.2.1.10

	// NameConstraints ::= SEQUENCE {
	//      permittedSubtrees       [0]     GeneralSubtrees OPTIONAL,
	//      excludedSubtrees        [1]     GeneralSubtrees OPTIONAL }
	//
	// GeneralSubtrees ::= SEQUENCE SIZE (1..MAX) OF GeneralSubtree
	//
	// GeneralSubtree ::= SEQUENCE {
	//      base                    GeneralName,
	//      minimum         [0]     BaseDistance DEFAULT 0,
	//      maximum         [1]     BaseDistance OPTIONAL }
	//
	// BaseDistance ::= INTEGER (0..MAX)

	outer := cryptobyte.String(e.Value)
	var toplevel, permitted, excluded cryptobyte.String
	var havePermitted, haveExcluded bool
	if !outer.ReadASN1(&toplevel, cryptobyte_asn1.SEQUENCE) ||
		!outer.Empty() ||
		!toplevel.ReadOptionalASN1(&permitted, &havePermitted, cryptobyte_asn1.Tag(0).ContextSpecific().Constructed()) ||
		!toplevel.ReadOptionalASN1(&excluded, &haveExcluded, cryptobyte_asn1.Tag(1).ContextSpecific().Constructed()) ||
		!toplevel.Empty() {
		return false, errors.New("x509: invalid NameConstraints extension")
	}

	if !havePermitted && !haveExcluded || len(permitted) == 0 && len(excluded) == 0 {
		// https://tools.ietf.org/html/rfc5280#section-4.2.1.10:
		//   “either the permittedSubtrees field
		//   or the excludedSubtrees MUST be
		//   present”
		return false, errors.New("x509: empty name constraints extension")
	}

	getValues := func(subtrees cryptobyte.String) (dnsNames []string, ips []*net.IPNet, emails, uriDomains []string, err error) {
		for !subtrees.Empty() {
			var seq, value cryptobyte.String
			var tag cryptobyte_asn1.Tag
			if !subtrees.ReadASN1(&seq, cryptobyte_asn1.SEQUENCE) ||
				!seq.ReadAnyASN1(&value, &tag) {
				return nil, nil, nil, nil, fmt.Errorf("x509: invalid NameConstraints extension")
			}

			var (
				dnsTag   = cryptobyte_asn1.Tag(2).ContextSpecific()
				emailTag = cryptobyte_asn1.Tag(1).ContextSpecific()
				ipTag    = cryptobyte_asn1.Tag(7).ContextSpecific()
				uriTag   = cryptobyte_asn1.Tag(6).ContextSpecific()
			)

			switch tag {
			case dnsTag:
				domain := string(value)
				if err := isIA5String(domain); err != nil {
					return nil, nil, nil, nil, errors.New("x509: invalid constraint value: " + err.Error())
				}

				trimmedDomain := domain
				if len(trimmedDomain) > 0 && trimmedDomain[0] == '.' {
					// constraints can have a leading
					// period to exclude the domain
					// itself, but that's not valid in a
					// normal domain name.
					trimmedDomain = trimmedDomain[1:]
				}
				if _, ok := domainToReverseLabels(trimmedDomain); !ok {
					return nil, nil, nil, nil, fmt.Errorf("x509: failed to parse dnsName constraint %q", domain)
				}
				dnsNames = append(dnsNames, domain)

			case ipTag:
				l := len(value)
				var ip, mask []byte

				switch l {
				case 8:
					ip = value[:4]
					mask = value[4:]

				case 32:
					ip = value[:16]
					mask = value[16:]

				default:
					return nil, nil, nil, nil, fmt.Errorf("x509: IP constraint contained value of length %d", l)
				}

				if !isValidIPMask(mask) {
					return nil, nil, nil, nil, fmt.Errorf("x509: IP constraint contained invalid mask %x", mask)
				}

				ips = append(ips, &net.IPNet{IP: net.IP(ip), Mask: net.IPMask(mask)})

			case emailTag:
				constraint := string(value)
				if err := isIA5String(constraint); err != nil {
					return nil, nil, nil, nil, errors.New("x509: invalid constraint value: " + err.Error())
				}

				// If the constraint contains an @ then
				// it specifies an exact mailbox name.
				if strings.Contains(constraint, "@") {
					if _, ok := parseRFC2821Mailbox(constraint); !ok {
						return nil, nil, nil, nil, fmt.Errorf("x509: failed to parse rfc822Name constraint %q", constraint)
					}
				} else {
					// Otherwise it's a domain name.
					domain := constraint
					if len(domain) > 0 && domain[0] == '.' {
						domain = domain[1:]
					}
					if _, ok := domainToReverseLabels(domain); !ok {
						return nil, nil, nil, nil, fmt.Errorf("x509: failed to parse rfc822Name constraint %q", constraint)
					}
				}
				emails = append(emails, constraint)

			case uriTag:
				domain := string(value)
				if err := isIA5String(domain); err != nil {
					return nil, nil, nil, nil, errors.New("x509: invalid constraint value: " + err.Error())
				}

				if net.ParseIP(domain) != nil {
					return nil, nil, nil, nil, fmt.Errorf("x509: failed to parse URI constraint %q: cannot be IP address", domain)
				}

				trimmedDomain := domain
				if len(trimmedDomain) > 0 && trimmedDomain[0] == '.' {
					// constraints can have a leading
					// period to exclude the domain itself,
					// but that's not valid in a normal
					// domain name.
					trimmedDomain = trimmedDomain[1:]
				}
				if _, ok := domainToReverseLabels(trimmedDomain); !ok {
					return nil, nil, nil, nil, fmt.Errorf("x509: failed to parse URI constraint %q", domain)
				}
				uriDomains = append(uriDomains, domain)

			default:
				unhandled = true
			}
		}

		return dnsNames, ips, emails, uriDomains, nil
	}

	if out.PermittedDNSDomains, out.PermittedIPRanges, out.PermittedEmailAddresses, out.PermittedURIDomains, err = getValues(permitted); err != nil {
		return false, err
	}
	if out.ExcludedDNSDomains, out.ExcludedIPRanges, out.ExcludedEmailAddresses, out.ExcludedURIDomains, err = getValues(excluded); err != nil {
		return false, err
	}
	out.PermittedDNSDomainsCritical = e.Critical

	return unhandled, nil
}

func parseCertificate(in *certificate) (*Certificate, error) {
	var nfe NonFatalErrors

	out := new(Certificate)
	out.Raw = in.Raw
	out.RawTBSCertificate = in.TBSCertificate.Raw
	out.RawSubjectPublicKeyInfo = in.TBSCertificate.PublicKey.Raw
	out.RawSubject = in.TBSCertificate.Subject.FullBytes
	out.RawIssuer = in.TBSCertificate.Issuer.FullBytes

	out.Signature = in.SignatureValue.RightAlign()
	out.SignatureAlgorithm = SignatureAlgorithmFromAI(in.TBSCertificate.SignatureAlgorithm)

	out.PublicKeyAlgorithm =
		getPublicKeyAlgorithmFromOID(in.TBSCertificate.PublicKey.Algorithm.Algorithm)
	var err error
	out.PublicKey, err = parsePublicKey(out.PublicKeyAlgorithm, &in.TBSCertificate.PublicKey)
	if err != nil {
		return nil, err
	}

	out.Version = in.TBSCertificate.Version + 1
	out.SerialNumber = in.TBSCertificate.SerialNumber

	var issuer, subject pkix.RDNSequence
	if rest, err := asn1.Unmarshal(in.TBSCertificate.Subject.FullBytes, &subject); err != nil {
		return nil, err
	} else if len(rest) != 0 {
		return nil, errors.New("x509: trailing data after X.509 subject")
	}
	if rest, err := asn1.Unmarshal(in.TBSCertificate.Issuer.FullBytes, &issuer); err != nil {
		return nil, err
	} else if len(rest) != 0 {
		return nil, errors.New("x509: trailing data after X.509 subject")
	}

	out.Issuer.FillFromRDNSequence(&issuer)
	out.Subject.FillFromRDNSequence(&subject)

	out.NotBefore = in.TBSCertificate.Validity.NotBefore
	out.NotAfter = in.TBSCertificate.Validity.NotAfter

	for _, e := range in.TBSCertificate.Extensions {
		out.Extensions = append(out.Extensions, e)
		unhandled := false

		if len(e.Id) == 4 && e.Id[0] == OIDExtensionArc[0] && e.Id[1] == OIDExtensionArc[1] && e.Id[2] == OIDExtensionArc[2] {
			switch e.Id[3] {
			case OIDExtensionKeyUsage[3]:
				// RFC 5280, 4.2.1.3
				var usageBits asn1.BitString
				if rest, err := asn1.Unmarshal(e.Value, &usageBits); err != nil {
					return nil, err
				} else if len(rest) != 0 {
					return nil, errors.New("x509: trailing data after X.509 KeyUsage")
				}

				var usage int
				for i := 0; i < 9; i++ {
					if usageBits.At(i) != 0 {
						usage |= 1 << uint(i)
					}
				}
				out.KeyUsage = KeyUsage(usage)

			case OIDExtensionBasicConstraints[3]:
				// RFC 5280, 4.2.1.9
				var constraints basicConstraints
				if rest, err := asn1.Unmarshal(e.Value, &constraints); err != nil {
					return nil, err
				} else if len(rest) != 0 {
					return nil, errors.New("x509: trailing data after X.509 BasicConstraints")
				}

				out.BasicConstraintsValid = true
				out.IsCA = constraints.IsCA
				out.MaxPathLen = constraints.MaxPathLen
				out.MaxPathLenZero = out.MaxPathLen == 0
				// TODO: map out.MaxPathLen to 0 if it has the -1 default value? (Issue 19285)

			case OIDExtensionSubjectAltName[3]:
				out.DNSNames, out.EmailAddresses, out.IPAddresses, out.URIs, err = parseSANExtension(e.Value, &nfe)
				if err != nil {
					return nil, err
				}

				if len(out.DNSNames) == 0 && len(out.EmailAddresses) == 0 && len(out.IPAddresses) == 0 && len(out.URIs) == 0 {
					// If we didn't parse anything then we do the critical check, below.
					unhandled = true
				}

			case OIDExtensionNameConstraints[3]:
				unhandled, err = parseNameConstraintsExtension(out, e)
				if err != nil {
					return nil, err
				}

			case OIDExtensionCRLDistributionPoints[3]:
				// RFC 5280, 4.2.1.13
				if err := parseDistributionPoints(e.Value, &out.CRLDistributionPoints); err != nil {
					return nil, err
				}

			case OIDExtensionAuthorityKeyId[3]:
				// RFC 5280, 4.2.1.1
				var a authKeyId
				if rest, err := asn1.Unmarshal(e.Value, &a); err != nil {
					return nil, err
				} else if len(rest) != 0 {
					return nil, errors.New("x509: trailing data after X.509 authority key-id")
				}
				out.AuthorityKeyId = a.Id

			case OIDExtensionExtendedKeyUsage[3]:
				// RFC 5280, 4.2.1.12.  Extended Key Usage

				// id-ce-extKeyUsage OBJECT IDENTIFIER ::= { id-ce 37 }
				//
				// ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId
				//
				// KeyPurposeId ::= OBJECT IDENTIFIER

				var keyUsage []asn1.ObjectIdentifier
				if rest, err := asn1.Unmarshal(e.Value, &keyUsage); err != nil {
					return nil, err
				} else if len(rest) != 0 {
					return nil, errors.New("x509: trailing data after X.509 ExtendedKeyUsage")
				}

				for _, u := range keyUsage {
					if extKeyUsage, ok := extKeyUsageFromOID(u); ok {
						out.ExtKeyUsage = append(out.ExtKeyUsage, extKeyUsage)
					} else {
						out.UnknownExtKeyUsage = append(out.UnknownExtKeyUsage, u)
					}
				}

			case OIDExtensionSubjectKeyId[3]:
				// RFC 5280, 4.2.1.2
				var keyid []byte
				if rest, err := asn1.Unmarshal(e.Value, &keyid); err != nil {
					return nil, err
				} else if len(rest) != 0 {
					return nil, errors.New("x509: trailing data after X.509 key-id")
				}
				out.SubjectKeyId = keyid

			case OIDExtensionCertificatePolicies[3]:
				// RFC 5280 4.2.1.4: Certificate Policies
				var policies []policyInformation
				if rest, err := asn1.Unmarshal(e.Value, &policies); err != nil {
					return nil, err
				} else if len(rest) != 0 {
					return nil, errors.New("x509: trailing data after X.509 certificate policies")
				}
				out.PolicyIdentifiers = make([]asn1.ObjectIdentifier, len(policies))
				for i, policy := range policies {
					out.PolicyIdentifiers[i] = policy.Policy
				}

			default:
				// Unknown extensions are recorded if critical.
				unhandled = true
			}
		} else if e.Id.Equal(OIDExtensionAuthorityInfoAccess) {
			// RFC 5280 4.2.2.1: Authority Information Access
			var aia []authorityInfoAccess
			if rest, err := asn1.Unmarshal(e.Value, &aia); err != nil {
				return nil, err
			} else if len(rest) != 0 {
				return nil, errors.New("x509: trailing data after X.509 authority information")
			}

			for _, v := range aia {
				// GeneralName: uniformResourceIdentifier [6] IA5String
				if v.Location.Tag != 6 {
					continue
				}
				if v.Method.Equal(OIDAuthorityInfoAccessOCSP) {
					out.OCSPServer = append(out.OCSPServer, string(v.Location.Bytes))
				} else if v.Method.Equal(OIDAuthorityInfoAccessIssuers) {
					out.IssuingCertificateURL = append(out.IssuingCertificateURL, string(v.Location.Bytes))
				}
			}
		} else if e.Id.Equal(OIDExtensionCTSCT) {
			if rest, err := asn1.Unmarshal(e.Value, &out.RawSCT); err != nil {
				nfe.AddError(fmt.Errorf("failed to asn1.Unmarshal SCT list extension: %v", err))
			} else if len(rest) != 0 {
				nfe.AddError(errors.New("trailing data after ASN1-encoded SCT list"))
			} else {
				if rest, err := tls.Unmarshal(out.RawSCT, &out.SCTList); err != nil {
					nfe.AddError(fmt.Errorf("failed to tls.Unmarshal SCT list: %v", err))
				} else if len(rest) != 0 {
					nfe.AddError(errors.New("trailing data after TLS-encoded SCT list"))
				}
			}
		} else {
			// Unknown extensions are recorded if critical.
			unhandled = true
		}

		if e.Critical && unhandled {
			out.UnhandledCriticalExtensions = append(out.UnhandledCriticalExtensions, e.Id)
		}
	}
	if nfe.HasError() {
		return out, nfe
	}
	return out, nil
}

// ParseTBSCertificate parses a single TBSCertificate from the given ASN.1 DER data.
// The parsed data is returned in a Certificate struct for ease of access.
func ParseTBSCertificate(asn1Data []byte) (*Certificate, error) {
	var tbsCert tbsCertificate
	rest, err := asn1.Unmarshal(asn1Data, &tbsCert)
	if err != nil {
		return nil, err
	}
	if len(rest) > 0 {
		return nil, asn1.SyntaxError{Msg: "trailing data"}
	}
	return parseCertificate(&certificate{
		Raw:            tbsCert.Raw,
		TBSCertificate: tbsCert})
}

// ParseCertificate parses a single certificate from the given ASN.1 DER data.
func ParseCertificate(asn1Data []byte) (*Certificate, error) {
	var cert certificate
	rest, err := asn1.Unmarshal(asn1Data, &cert)
	if err != nil {
		return nil, err
	}
	if len(rest) > 0 {
		return nil, asn1.SyntaxError{Msg: "trailing data"}
	}

	return parseCertificate(&cert)
}

// ParseCertificates parses one or more certificates from the given ASN.1 DER
// data. The certificates must be concatenated with no intermediate padding.
func ParseCertificates(asn1Data []byte) ([]*Certificate, error) {
	var v []*certificate

	for len(asn1Data) > 0 {
		cert := new(certificate)
		var err error
		asn1Data, err = asn1.Unmarshal(asn1Data, cert)
		if err != nil {
			return nil, err
		}
		v = append(v, cert)
	}

	ret := make([]*Certificate, len(v))
	for i, ci := range v {
		cert, err := parseCertificate(ci)
		if err != nil {
			return nil, err
		}
		ret[i] = cert
	}

	return ret, nil
}

func reverseBitsInAByte(in byte) byte {
	b1 := in>>4 | in<<4
	b2 := b1>>2&0x33 | b1<<2&0xcc
	b3 := b2>>1&0x55 | b2<<1&0xaa
	return b3
}

// asn1BitLength returns the bit-length of bitString by considering the
// most-significant bit in a byte to be the "first" bit. This convention
// matches ASN.1, but differs from almost everything else.
func asn1BitLength(bitString []byte) int {
	bitLen := len(bitString) * 8

	for i := range bitString {
		b := bitString[len(bitString)-i-1]

		for bit := uint(0); bit < 8; bit++ {
			if (b>>bit)&1 == 1 {
				return bitLen
			}
			bitLen--
		}
	}

	return 0
}

// OID values for standard extensions from RFC 5280.
var (
	OIDExtensionArc                        = asn1.ObjectIdentifier{2, 5, 29} // id-ce RFC5280 s4.2.1
	OIDExtensionSubjectKeyId               = asn1.ObjectIdentifier{2, 5, 29, 14}
	OIDExtensionKeyUsage                   = asn1.ObjectIdentifier{2, 5, 29, 15}
	OIDExtensionExtendedKeyUsage           = asn1.ObjectIdentifier{2, 5, 29, 37}
	OIDExtensionAuthorityKeyId             = asn1.ObjectIdentifier{2, 5, 29, 35}
	OIDExtensionBasicConstraints           = asn1.ObjectIdentifier{2, 5, 29, 19}
	OIDExtensionSubjectAltName             = asn1.ObjectIdentifier{2, 5, 29, 17}
	OIDExtensionCertificatePolicies        = asn1.ObjectIdentifier{2, 5, 29, 32}
	OIDExtensionNameConstraints            = asn1.ObjectIdentifier{2, 5, 29, 30}
	OIDExtensionCRLDistributionPoints      = asn1.ObjectIdentifier{2, 5, 29, 31}
	OIDExtensionIssuerAltName              = asn1.ObjectIdentifier{2, 5, 29, 18}
	OIDExtensionSubjectDirectoryAttributes = asn1.ObjectIdentifier{2, 5, 29, 9}
	OIDExtensionInhibitAnyPolicy           = asn1.ObjectIdentifier{2, 5, 29, 54}
	OIDExtensionPolicyConstraints          = asn1.ObjectIdentifier{2, 5, 29, 36}
	OIDExtensionPolicyMappings             = asn1.ObjectIdentifier{2, 5, 29, 33}
	OIDExtensionFreshestCRL                = asn1.ObjectIdentifier{2, 5, 29, 46}

	OIDExtensionAuthorityInfoAccess = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 1, 1}
	OIDExtensionSubjectInfoAccess   = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 1, 11}
	// OIDExtensionCTPoison is defined in RFC 6962 s3.1.
	OIDExtensionCTPoison = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 11129, 2, 4, 3}
	// OIDExtensionCTSCT is defined in RFC 6962 s3.3.
	OIDExtensionCTSCT = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 11129, 2, 4, 2}
)

var (
	OIDAuthorityInfoAccessOCSP    = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 48, 1}
	OIDAuthorityInfoAccessIssuers = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 48, 2}
)

// oidInExtensions returns whether an extension with the given oid exists in
// extensions.
func oidInExtensions(oid asn1.ObjectIdentifier, extensions []pkix.Extension) bool {
	for _, e := range extensions {
		if e.Id.Equal(oid) {
			return true
		}
	}
	return false
}

// marshalSANs marshals a list of addresses into a the contents of an X.509
// SubjectAlternativeName extension.
func marshalSANs(dnsNames, emailAddresses []string, ipAddresses []net.IP, uris []*url.URL) (derBytes []byte, err error) {
	var rawValues []asn1.RawValue
	for _, name := range dnsNames {
		rawValues = append(rawValues, asn1.RawValue{Tag: nameTypeDNS, Class: asn1.ClassContextSpecific, Bytes: []byte(name)})
	}
	for _, email := range emailAddresses {
		rawValues = append(rawValues, asn1.RawValue{Tag: nameTypeEmail, Class: asn1.ClassContextSpecific, Bytes: []byte(email)})
	}
	for _, rawIP := range ipAddresses {
		// If possible, we always want to encode IPv4 addresses in 4 bytes.
		ip := rawIP.To4()
		if ip == nil {
			ip = rawIP
		}
		rawValues = append(rawValues, asn1.RawValue{Tag: nameTypeIP, Class: asn1.ClassContextSpecific, Bytes: ip})
	}
	for _, uri := range uris {
		rawValues = append(rawValues, asn1.RawValue{Tag: nameTypeURI, Class: asn1.ClassContextSpecific, Bytes: []byte(uri.String())})
	}
	return asn1.Marshal(rawValues)
}

func isIA5String(s string) error {
	for _, r := range s {
		if r >= utf8.RuneSelf {
			return fmt.Errorf("x509: %q cannot be encoded as an IA5String", s)
		}
	}

	return nil
}

func buildExtensions(template *Certificate, subjectIsEmpty bool, authorityKeyId []byte) (ret []pkix.Extension, err error) {
	ret = make([]pkix.Extension, 11 /* maximum number of elements. */)
	n := 0

	if template.KeyUsage != 0 &&
		!oidInExtensions(OIDExtensionKeyUsage, template.ExtraExtensions) {
		ret[n].Id = OIDExtensionKeyUsage
		ret[n].Critical = true

		var a [2]byte
		a[0] = reverseBitsInAByte(byte(template.KeyUsage))
		a[1] = reverseBitsInAByte(byte(template.KeyUsage >> 8))

		l := 1
		if a[1] != 0 {
			l = 2
		}

		bitString := a[:l]
		ret[n].Value, err = asn1.Marshal(asn1.BitString{Bytes: bitString, BitLength: asn1BitLength(bitString)})
		if err != nil {
			return
		}
		n++
	}

	if (len(template.ExtKeyUsage) > 0 || len(template.UnknownExtKeyUsage) > 0) &&
		!oidInExtensions(OIDExtensionExtendedKeyUsage, template.ExtraExtensions) {
		ret[n].Id = OIDExtensionExtendedKeyUsage

		var oids []asn1.ObjectIdentifier
		for _, u := range template.ExtKeyUsage {
			if oid, ok := oidFromExtKeyUsage(u); ok {
				oids = append(oids, oid)
			} else {
				panic("internal error")
			}
		}

		oids = append(oids, template.UnknownExtKeyUsage...)

		ret[n].Value, err = asn1.Marshal(oids)
		if err != nil {
			return
		}
		n++
	}

	if template.BasicConstraintsValid && !oidInExtensions(OIDExtensionBasicConstraints, template.ExtraExtensions) {
		// Leaving MaxPathLen as zero indicates that no maximum path
		// length is desired, unless MaxPathLenZero is set. A value of
		// -1 causes encoding/asn1 to omit the value as desired.
		maxPathLen := template.MaxPathLen
		if maxPathLen == 0 && !template.MaxPathLenZero {
			maxPathLen = -1
		}
		ret[n].Id = OIDExtensionBasicConstraints
		ret[n].Value, err = asn1.Marshal(basicConstraints{template.IsCA, maxPathLen})
		ret[n].Critical = true
		if err != nil {
			return
		}
		n++
	}

	if len(template.SubjectKeyId) > 0 && !oidInExtensions(OIDExtensionSubjectKeyId, template.ExtraExtensions) {
		ret[n].Id = OIDExtensionSubjectKeyId
		ret[n].Value, err = asn1.Marshal(template.SubjectKeyId)
		if err != nil {
			return
		}
		n++
	}

	if len(authorityKeyId) > 0 && !oidInExtensions(OIDExtensionAuthorityKeyId, template.ExtraExtensions) {
		ret[n].Id = OIDExtensionAuthorityKeyId
		ret[n].Value, err = asn1.Marshal(authKeyId{authorityKeyId})
		if err != nil {
			return
		}
		n++
	}

	if (len(template.OCSPServer) > 0 || len(template.IssuingCertificateURL) > 0) &&
		!oidInExtensions(OIDExtensionAuthorityInfoAccess, template.ExtraExtensions) {
		ret[n].Id = OIDExtensionAuthorityInfoAccess
		var aiaValues []authorityInfoAccess
		for _, name := range template.OCSPServer {
			aiaValues = append(aiaValues, authorityInfoAccess{
				Method:   OIDAuthorityInfoAccessOCSP,
				Location: asn1.RawValue{Tag: 6, Class: asn1.ClassContextSpecific, Bytes: []byte(name)},
			})
		}
		for _, name := range template.IssuingCertificateURL {
			aiaValues = append(aiaValues, authorityInfoAccess{
				Method:   OIDAuthorityInfoAccessIssuers,
				Location: asn1.RawValue{Tag: 6, Class: asn1.ClassContextSpecific, Bytes: []byte(name)},
			})
		}
		ret[n].Value, err = asn1.Marshal(aiaValues)
		if err != nil {
			return
		}
		n++
	}

	if (len(template.DNSNames) > 0 || len(template.EmailAddresses) > 0 || len(template.IPAddresses) > 0 || len(template.URIs) > 0) &&
		!oidInExtensions(OIDExtensionSubjectAltName, template.ExtraExtensions) {
		ret[n].Id = OIDExtensionSubjectAltName
		// https://tools.ietf.org/html/rfc5280#section-4.2.1.6
		// “If the subject field contains an empty sequence ... then
		// subjectAltName extension ... is marked as critical”
		ret[n].Critical = subjectIsEmpty
		ret[n].Value, err = marshalSANs(template.DNSNames, template.EmailAddresses, template.IPAddresses, template.URIs)
		if err != nil {
			return
		}
		n++
	}

	if len(template.PolicyIdentifiers) > 0 &&
		!oidInExtensions(OIDExtensionCertificatePolicies, template.ExtraExtensions) {
		ret[n].Id = OIDExtensionCertificatePolicies
		policies := make([]policyInformation, len(template.PolicyIdentifiers))
		for i, policy := range template.PolicyIdentifiers {
			policies[i].Policy = policy
		}
		ret[n].Value, err = asn1.Marshal(policies)
		if err != nil {
			return
		}
		n++
	}

	if (len(template.PermittedDNSDomains) > 0 || len(template.ExcludedDNSDomains) > 0 ||
		len(template.PermittedIPRanges) > 0 || len(template.ExcludedIPRanges) > 0 ||
		len(template.PermittedEmailAddresses) > 0 || len(template.ExcludedEmailAddresses) > 0 ||
		len(template.PermittedURIDomains) > 0 || len(template.ExcludedURIDomains) > 0) &&
		!oidInExtensions(OIDExtensionNameConstraints, template.ExtraExtensions) {
		ret[n].Id = OIDExtensionNameConstraints
		ret[n].Critical = template.PermittedDNSDomainsCritical

		ipAndMask := func(ipNet *net.IPNet) []byte {
			maskedIP := ipNet.IP.Mask(ipNet.Mask)
			ipAndMask := make([]byte, 0, len(maskedIP)+len(ipNet.Mask))
			ipAndMask = append(ipAndMask, maskedIP...)
			ipAndMask = append(ipAndMask, ipNet.Mask...)
			return ipAndMask
		}

		serialiseConstraints := func(dns []string, ips []*net.IPNet, emails []string, uriDomains []string) (der []byte, err error) {
			var b cryptobyte.Builder

			for _, name := range dns {
				if err = isIA5String(name); err != nil {
					return nil, err
				}

				b.AddASN1(cryptobyte_asn1.SEQUENCE, func(b *cryptobyte.Builder) {
					b.AddASN1(cryptobyte_asn1.Tag(2).ContextSpecific(), func(b *cryptobyte.Builder) {
						b.AddBytes([]byte(name))
					})
				})
			}

			for _, ipNet := range ips {
				b.AddASN1(cryptobyte_asn1.SEQUENCE, func(b *cryptobyte.Builder) {
					b.AddASN1(cryptobyte_asn1.Tag(7).ContextSpecific(), func(b *cryptobyte.Builder) {
						b.AddBytes(ipAndMask(ipNet))
					})
				})
			}

			for _, email := range emails {
				if err = isIA5String(email); err != nil {
					return nil, err
				}

				b.AddASN1(cryptobyte_asn1.SEQUENCE, func(b *cryptobyte.Builder) {
					b.AddASN1(cryptobyte_asn1.Tag(1).ContextSpecific(), func(b *cryptobyte.Builder) {
						b.AddBytes([]byte(email))
					})
				})
			}

			for _, uriDomain := range uriDomains {
				if err = isIA5String(uriDomain); err != nil {
					return nil, err
				}

				b.AddASN1(cryptobyte_asn1.SEQUENCE, func(b *cryptobyte.Builder) {
					b.AddASN1(cryptobyte_asn1.Tag(6).ContextSpecific(), func(b *cryptobyte.Builder) {
						b.AddBytes([]byte(uriDomain))
					})
				})
			}

			return b.Bytes()
		}

		permitted, err := serialiseConstraints(template.PermittedDNSDomains, template.PermittedIPRanges, template.PermittedEmailAddresses, template.PermittedURIDomains)
		if err != nil {
			return nil, err
		}

		excluded, err := serialiseConstraints(template.ExcludedDNSDomains, template.ExcludedIPRanges, template.ExcludedEmailAddresses, template.ExcludedURIDomains)
		if err != nil {
			return nil, err
		}

		var b cryptobyte.Builder
		b.AddASN1(cryptobyte_asn1.SEQUENCE, func(b *cryptobyte.Builder) {
			if len(permitted) > 0 {
				b.AddASN1(cryptobyte_asn1.Tag(0).ContextSpecific().Constructed(), func(b *cryptobyte.Builder) {
					b.AddBytes(permitted)
				})
			}

			if len(excluded) > 0 {
				b.AddASN1(cryptobyte_asn1.Tag(1).ContextSpecific().Constructed(), func(b *cryptobyte.Builder) {
					b.AddBytes(excluded)
				})
			}
		})

		ret[n].Value, err = b.Bytes()
		if err != nil {
			return nil, err
		}
		n++
	}

	if len(template.CRLDistributionPoints) > 0 &&
		!oidInExtensions(OIDExtensionCRLDistributionPoints, template.ExtraExtensions) {
		ret[n].Id = OIDExtensionCRLDistributionPoints

		var crlDp []distributionPoint
		for _, name := range template.CRLDistributionPoints {
			dp := distributionPoint{
				DistributionPoint: distributionPointName{
					FullName: []asn1.RawValue{
						asn1.RawValue{Tag: 6, Class: asn1.ClassContextSpecific, Bytes: []byte(name)},
					},
				},
			}
			crlDp = append(crlDp, dp)
		}

		ret[n].Value, err = asn1.Marshal(crlDp)
		if err != nil {
			return
		}
		n++
	}

	if (len(template.RawSCT) > 0 || len(template.SCTList.SCTList) > 0) && !oidInExtensions(OIDExtensionCTSCT, template.ExtraExtensions) {
		rawSCT := template.RawSCT
		if len(template.SCTList.SCTList) > 0 {
			rawSCT, err = tls.Marshal(template.SCTList)
			if err != nil {
				return
			}
		}
		ret[n].Id = OIDExtensionCTSCT
		ret[n].Value, err = asn1.Marshal(rawSCT)
		if err != nil {
			return
		}
		n++
	}

	// Adding another extension here? Remember to update the maximum number
	// of elements in the make() at the top of the function.

	return append(ret[:n], template.ExtraExtensions...), nil
}

func subjectBytes(cert *Certificate) ([]byte, error) {
	if len(cert.RawSubject) > 0 {
		return cert.RawSubject, nil
	}

	return asn1.Marshal(cert.Subject.ToRDNSequence())
}

// signingParamsForPublicKey returns the parameters to use for signing with
// priv. If requestedSigAlgo is not zero then it overrides the default
// signature algorithm.
func signingParamsForPublicKey(pub interface{}, requestedSigAlgo SignatureAlgorithm) (hashFunc crypto.Hash, sigAlgo pkix.AlgorithmIdentifier, err error) {
	var pubType PublicKeyAlgorithm

	switch pub := pub.(type) {
	case *rsa.PublicKey:
		pubType = RSA
		hashFunc = crypto.SHA256
		sigAlgo.Algorithm = oidSignatureSHA256WithRSA
		sigAlgo.Parameters = asn1.NullRawValue

	case *ecdsa.PublicKey:
		pubType = ECDSA

		switch pub.Curve {
		case elliptic.P224(), elliptic.P256():
			hashFunc = crypto.SHA256
			sigAlgo.Algorithm = oidSignatureECDSAWithSHA256
		case elliptic.P384():
			hashFunc = crypto.SHA384
			sigAlgo.Algorithm = oidSignatureECDSAWithSHA384
		case elliptic.P521():
			hashFunc = crypto.SHA512
			sigAlgo.Algorithm = oidSignatureECDSAWithSHA512
		default:
			err = errors.New("x509: unknown elliptic curve")
		}

	default:
		err = errors.New("x509: only RSA and ECDSA keys supported")
	}

	if err != nil {
		return
	}

	if requestedSigAlgo == 0 {
		return
	}

	found := false
	for _, details := range signatureAlgorithmDetails {
		if details.algo == requestedSigAlgo {
			if details.pubKeyAlgo != pubType {
				err = errors.New("x509: requested SignatureAlgorithm does not match private key type")
				return
			}
			sigAlgo.Algorithm, hashFunc = details.oid, details.hash
			if hashFunc == 0 {
				err = errors.New("x509: cannot sign with hash function requested")
				return
			}
			if requestedSigAlgo.isRSAPSS() {
				sigAlgo.Parameters = rsaPSSParameters(hashFunc)
			}
			found = true
			break
		}
	}

	if !found {
		err = errors.New("x509: unknown SignatureAlgorithm")
	}

	return
}

// emptyASN1Subject is the ASN.1 DER encoding of an empty Subject, which is
// just an empty SEQUENCE.
var emptyASN1Subject = []byte{0x30, 0}

// CreateCertificate creates a new X.509v3 certificate based on a template.
// The following members of template are used: AuthorityKeyId,
// BasicConstraintsValid, DNSNames, ExcludedDNSDomains, ExtKeyUsage,
// IsCA, KeyUsage, MaxPathLen, MaxPathLenZero, NotAfter, NotBefore,
// PermittedDNSDomains, PermittedDNSDomainsCritical, SerialNumber,
// SignatureAlgorithm, Subject, SubjectKeyId, UnknownExtKeyUsage,
// and RawSCT.
//
// The certificate is signed by parent. If parent is equal to template then the
// certificate is self-signed. The parameter pub is the public key of the
// signee and priv is the private key of the signer.
//
// The returned slice is the certificate in DER encoding.
//
// All keys types that are implemented via crypto.Signer are supported (This
// includes *rsa.PublicKey and *ecdsa.PublicKey.)
//
// The AuthorityKeyId will be taken from the SubjectKeyId of parent, if any,
// unless the resulting certificate is self-signed. Otherwise the value from
// template will be used.
func CreateCertificate(rand io.Reader, template, parent *Certificate, pub, priv interface{}) (cert []byte, err error) {
	key, ok := priv.(crypto.Signer)
	if !ok {
		return nil, errors.New("x509: certificate private key does not implement crypto.Signer")
	}

	if template.SerialNumber == nil {
		return nil, errors.New("x509: no SerialNumber given")
	}

	hashFunc, signatureAlgorithm, err := signingParamsForPublicKey(key.Public(), template.SignatureAlgorithm)
	if err != nil {
		return nil, err
	}

	publicKeyBytes, publicKeyAlgorithm, err := marshalPublicKey(pub)
	if err != nil {
		return nil, err
	}

	asn1Issuer, err := subjectBytes(parent)
	if err != nil {
		return
	}

	asn1Subject, err := subjectBytes(template)
	if err != nil {
		return
	}

	authorityKeyId := template.AuthorityKeyId
	if !bytes.Equal(asn1Issuer, asn1Subject) && len(parent.SubjectKeyId) > 0 {
		authorityKeyId = parent.SubjectKeyId
	}

	extensions, err := buildExtensions(template, bytes.Equal(asn1Subject, emptyASN1Subject), authorityKeyId)
	if err != nil {
		return
	}

	encodedPublicKey := asn1.BitString{BitLength: len(publicKeyBytes) * 8, Bytes: publicKeyBytes}
	c := tbsCertificate{
		Version:            2,
		SerialNumber:       template.SerialNumber,
		SignatureAlgorithm: signatureAlgorithm,
		Issuer:             asn1.RawValue{FullBytes: asn1Issuer},
		Validity:           validity{template.NotBefore.UTC(), template.NotAfter.UTC()},
		Subject:            asn1.RawValue{FullBytes: asn1Subject},
		PublicKey:          publicKeyInfo{nil, publicKeyAlgorithm, encodedPublicKey},
		Extensions:         extensions,
	}

	tbsCertContents, err := asn1.Marshal(c)
	if err != nil {
		return
	}

	c.Raw = tbsCertContents

	h := hashFunc.New()
	h.Write(tbsCertContents)
	digest := h.Sum(nil)

	var signerOpts crypto.SignerOpts
	signerOpts = hashFunc
	if template.SignatureAlgorithm != 0 && template.SignatureAlgorithm.isRSAPSS() {
		signerOpts = &rsa.PSSOptions{
			SaltLength: rsa.PSSSaltLengthEqualsHash,
			Hash:       hashFunc,
		}
	}

	var signature []byte
	signature, err = key.Sign(rand, digest, signerOpts)
	if err != nil {
		return
	}

	return asn1.Marshal(certificate{
		nil,
		c,
		signatureAlgorithm,
		asn1.BitString{Bytes: signature, BitLength: len(signature) * 8},
	})
}

// pemCRLPrefix is the magic string that indicates that we have a PEM encoded
// CRL.
var pemCRLPrefix = []byte("-----BEGIN X509 CRL")

// pemType is the type of a PEM encoded CRL.
var pemType = "X509 CRL"

// ParseCRL parses a CRL from the given bytes. It's often the case that PEM
// encoded CRLs will appear where they should be DER encoded, so this function
// will transparently handle PEM encoding as long as there isn't any leading
// garbage.
func ParseCRL(crlBytes []byte) (*pkix.CertificateList, error) {
	if bytes.HasPrefix(crlBytes, pemCRLPrefix) {
		block, _ := pem.Decode(crlBytes)
		if block != nil && block.Type == pemType {
			crlBytes = block.Bytes
		}
	}
	return ParseDERCRL(crlBytes)
}

// ParseDERCRL parses a DER encoded CRL from the given bytes.
func ParseDERCRL(derBytes []byte) (*pkix.CertificateList, error) {
	certList := new(pkix.CertificateList)
	if rest, err := asn1.Unmarshal(derBytes, certList); err != nil {
		return nil, err
	} else if len(rest) != 0 {
		return nil, errors.New("x509: trailing data after CRL")
	}
	return certList, nil
}

// CreateCRL returns a DER encoded CRL, signed by this Certificate, that
// contains the given list of revoked certificates.
func (c *Certificate) CreateCRL(rand io.Reader, priv interface{}, revokedCerts []pkix.RevokedCertificate, now, expiry time.Time) (crlBytes []byte, err error) {
	key, ok := priv.(crypto.Signer)
	if !ok {
		return nil, errors.New("x509: certificate private key does not implement crypto.Signer")
	}

	hashFunc, signatureAlgorithm, err := signingParamsForPublicKey(key.Public(), 0)
	if err != nil {
		return nil, err
	}

	// Force revocation times to UTC per RFC 5280.
	revokedCertsUTC := make([]pkix.RevokedCertificate, len(revokedCerts))
	for i, rc := range revokedCerts {
		rc.RevocationTime = rc.RevocationTime.UTC()
		revokedCertsUTC[i] = rc
	}

	tbsCertList := pkix.TBSCertificateList{
		Version:             1,
		Signature:           signatureAlgorithm,
		Issuer:              c.Subject.ToRDNSequence(),
		ThisUpdate:          now.UTC(),
		NextUpdate:          expiry.UTC(),
		RevokedCertificates: revokedCertsUTC,
	}

	// Authority Key Id
	if len(c.SubjectKeyId) > 0 {
		var aki pkix.Extension
		aki.Id = OIDExtensionAuthorityKeyId
		aki.Value, err = asn1.Marshal(authKeyId{Id: c.SubjectKeyId})
		if err != nil {
			return
		}
		tbsCertList.Extensions = append(tbsCertList.Extensions, aki)
	}

	tbsCertListContents, err := asn1.Marshal(tbsCertList)
	if err != nil {
		return
	}

	h := hashFunc.New()
	h.Write(tbsCertListContents)
	digest := h.Sum(nil)

	var signature []byte
	signature, err = key.Sign(rand, digest, hashFunc)
	if err != nil {
		return
	}

	return asn1.Marshal(pkix.CertificateList{
		TBSCertList:        tbsCertList,
		SignatureAlgorithm: signatureAlgorithm,
		SignatureValue:     asn1.BitString{Bytes: signature, BitLength: len(signature) * 8},
	})
}

// CertificateRequest represents a PKCS #10, certificate signature request.
type CertificateRequest struct {
	Raw                      []byte // Complete ASN.1 DER content (CSR, signature algorithm and signature).
	RawTBSCertificateRequest []byte // Certificate request info part of raw ASN.1 DER content.
	RawSubjectPublicKeyInfo  []byte // DER encoded SubjectPublicKeyInfo.
	RawSubject               []byte // DER encoded Subject.

	Version            int
	Signature          []byte
	SignatureAlgorithm SignatureAlgorithm

	PublicKeyAlgorithm PublicKeyAlgorithm
	PublicKey          interface{}

	Subject pkix.Name

	// Attributes is the dried husk of a bug and shouldn't be used.
	Attributes []pkix.AttributeTypeAndValueSET

	// Extensions contains raw X.509 extensions. When parsing CSRs, this
	// can be used to extract extensions that are not parsed by this
	// package.
	Extensions []pkix.Extension

	// ExtraExtensions contains extensions to be copied, raw, into any
	// marshaled CSR. Values override any extensions that would otherwise
	// be produced based on the other fields but are overridden by any
	// extensions specified in Attributes.
	//
	// The ExtraExtensions field is not populated when parsing CSRs, see
	// Extensions.
	ExtraExtensions []pkix.Extension

	// Subject Alternate Name values.
	DNSNames       []string
	EmailAddresses []string
	IPAddresses    []net.IP
	URIs           []*url.URL
}

// These structures reflect the ASN.1 structure of X.509 certificate
// signature requests (see RFC 2986):

type tbsCertificateRequest struct {
	Raw           asn1.RawContent
	Version       int
	Subject       asn1.RawValue
	PublicKey     publicKeyInfo
	RawAttributes []asn1.RawValue `asn1:"tag:0"`
}

type certificateRequest struct {
	Raw                asn1.RawContent
	TBSCSR             tbsCertificateRequest
	SignatureAlgorithm pkix.AlgorithmIdentifier
	SignatureValue     asn1.BitString
}

// oidExtensionRequest is a PKCS#9 OBJECT IDENTIFIER that indicates requested
// extensions in a CSR.
var oidExtensionRequest = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 9, 14}

// newRawAttributes converts AttributeTypeAndValueSETs from a template
// CertificateRequest's Attributes into tbsCertificateRequest RawAttributes.
func newRawAttributes(attributes []pkix.AttributeTypeAndValueSET) ([]asn1.RawValue, error) {
	var rawAttributes []asn1.RawValue
	b, err := asn1.Marshal(attributes)
	if err != nil {
		return nil, err
	}
	rest, err := asn1.Unmarshal(b, &rawAttributes)
	if err != nil {
		return nil, err
	}
	if len(rest) != 0 {
		return nil, errors.New("x509: failed to unmarshal raw CSR Attributes")
	}
	return rawAttributes, nil
}

// parseRawAttributes Unmarshals RawAttributes intos AttributeTypeAndValueSETs.
func parseRawAttributes(rawAttributes []asn1.RawValue) []pkix.AttributeTypeAndValueSET {
	var attributes []pkix.AttributeTypeAndValueSET
	for _, rawAttr := range rawAttributes {
		var attr pkix.AttributeTypeAndValueSET
		rest, err := asn1.Unmarshal(rawAttr.FullBytes, &attr)
		// Ignore attributes that don't parse into pkix.AttributeTypeAndValueSET
		// (i.e.: challengePassword or unstructuredName).
		if err == nil && len(rest) == 0 {
			attributes = append(attributes, attr)
		}
	}
	return attributes
}

// parseCSRExtensions parses the attributes from a CSR and extracts any
// requested extensions.
func parseCSRExtensions(rawAttributes []asn1.RawValue) ([]pkix.Extension, error) {
	// pkcs10Attribute reflects the Attribute structure from section 4.1 of
	// https://tools.ietf.org/html/rfc2986.
	type pkcs10Attribute struct {
		Id     asn1.ObjectIdentifier
		Values []asn1.RawValue `asn1:"set"`
	}

	var ret []pkix.Extension
	for _, rawAttr := range rawAttributes {
		var attr pkcs10Attribute
		if rest, err := asn1.Unmarshal(rawAttr.FullBytes, &attr); err != nil || len(rest) != 0 || len(attr.Values) == 0 {
			// Ignore attributes that don't parse.
			continue
		}

		if !attr.Id.Equal(oidExtensionRequest) {
			continue
		}

		var extensions []pkix.Extension
		if _, err := asn1.Unmarshal(attr.Values[0].FullBytes, &extensions); err != nil {
			return nil, err
		}
		ret = append(ret, extensions...)
	}

	return ret, nil
}

// CreateCertificateRequest creates a new certificate request based on a
// template. The following members of template are used: Attributes, DNSNames,
// EmailAddresses, ExtraExtensions, IPAddresses, URIs, SignatureAlgorithm, and
// Subject. The private key is the private key of the signer.
//
// The returned slice is the certificate request in DER encoding.
//
// All keys types that are implemented via crypto.Signer are supported (This
// includes *rsa.PublicKey and *ecdsa.PublicKey.)
func CreateCertificateRequest(rand io.Reader, template *CertificateRequest, priv interface{}) (csr []byte, err error) {
	key, ok := priv.(crypto.Signer)
	if !ok {
		return nil, errors.New("x509: certificate private key does not implement crypto.Signer")
	}

	var hashFunc crypto.Hash
	var sigAlgo pkix.AlgorithmIdentifier
	hashFunc, sigAlgo, err = signingParamsForPublicKey(key.Public(), template.SignatureAlgorithm)
	if err != nil {
		return nil, err
	}

	var publicKeyBytes []byte
	var publicKeyAlgorithm pkix.AlgorithmIdentifier
	publicKeyBytes, publicKeyAlgorithm, err = marshalPublicKey(key.Public())
	if err != nil {
		return nil, err
	}

	var extensions []pkix.Extension

	if (len(template.DNSNames) > 0 || len(template.EmailAddresses) > 0 || len(template.IPAddresses) > 0 || len(template.URIs) > 0) &&
		!oidInExtensions(OIDExtensionSubjectAltName, template.ExtraExtensions) {
		sanBytes, err := marshalSANs(template.DNSNames, template.EmailAddresses, template.IPAddresses, template.URIs)
		if err != nil {
			return nil, err
		}

		extensions = append(extensions, pkix.Extension{
			Id:    OIDExtensionSubjectAltName,
			Value: sanBytes,
		})
	}

	extensions = append(extensions, template.ExtraExtensions...)

	var attributes []pkix.AttributeTypeAndValueSET
	attributes = append(attributes, template.Attributes...)

	if len(extensions) > 0 {
		// specifiedExtensions contains all the extensions that we
		// found specified via template.Attributes.
		specifiedExtensions := make(map[string]bool)

		for _, atvSet := range template.Attributes {
			if !atvSet.Type.Equal(oidExtensionRequest) {
				continue
			}

			for _, atvs := range atvSet.Value {
				for _, atv := range atvs {
					specifiedExtensions[atv.Type.String()] = true
				}
			}
		}

		atvs := make([]pkix.AttributeTypeAndValue, 0, len(extensions))
		for _, e := range extensions {
			if specifiedExtensions[e.Id.String()] {
				// Attributes already contained a value for
				// this extension and it takes priority.
				continue
			}

			atvs = append(atvs, pkix.AttributeTypeAndValue{
				// There is no place for the critical flag in a CSR.
				Type:  e.Id,
				Value: e.Value,
			})
		}

		// Append the extensions to an existing attribute if possible.
		appended := false
		for _, atvSet := range attributes {
			if !atvSet.Type.Equal(oidExtensionRequest) || len(atvSet.Value) == 0 {
				continue
			}

			atvSet.Value[0] = append(atvSet.Value[0], atvs...)
			appended = true
			break
		}

		// Otherwise, add a new attribute for the extensions.
		if !appended {
			attributes = append(attributes, pkix.AttributeTypeAndValueSET{
				Type: oidExtensionRequest,
				Value: [][]pkix.AttributeTypeAndValue{
					atvs,
				},
			})
		}
	}

	asn1Subject := template.RawSubject
	if len(asn1Subject) == 0 {
		asn1Subject, err = asn1.Marshal(template.Subject.ToRDNSequence())
		if err != nil {
			return
		}
	}

	rawAttributes, err := newRawAttributes(attributes)
	if err != nil {
		return
	}

	tbsCSR := tbsCertificateRequest{
		Version: 0, // PKCS #10, RFC 2986
		Subject: asn1.RawValue{FullBytes: asn1Subject},
		PublicKey: publicKeyInfo{
			Algorithm: publicKeyAlgorithm,
			PublicKey: asn1.BitString{
				Bytes:     publicKeyBytes,
				BitLength: len(publicKeyBytes) * 8,
			},
		},
		RawAttributes: rawAttributes,
	}

	tbsCSRContents, err := asn1.Marshal(tbsCSR)
	if err != nil {
		return
	}
	tbsCSR.Raw = tbsCSRContents

	h := hashFunc.New()
	h.Write(tbsCSRContents)
	digest := h.Sum(nil)

	var signature []byte
	signature, err = key.Sign(rand, digest, hashFunc)
	if err != nil {
		return
	}

	return asn1.Marshal(certificateRequest{
		TBSCSR:             tbsCSR,
		SignatureAlgorithm: sigAlgo,
		SignatureValue: asn1.BitString{
			Bytes:     signature,
			BitLength: len(signature) * 8,
		},
	})
}

// ParseCertificateRequest parses a single certificate request from the
// given ASN.1 DER data.
func ParseCertificateRequest(asn1Data []byte) (*CertificateRequest, error) {
	var csr certificateRequest

	rest, err := asn1.Unmarshal(asn1Data, &csr)
	if err != nil {
		return nil, err
	} else if len(rest) != 0 {
		return nil, asn1.SyntaxError{Msg: "trailing data"}
	}

	return parseCertificateRequest(&csr)
}

func parseCertificateRequest(in *certificateRequest) (*CertificateRequest, error) {
	out := &CertificateRequest{
		Raw: in.Raw,
		RawTBSCertificateRequest: in.TBSCSR.Raw,
		RawSubjectPublicKeyInfo:  in.TBSCSR.PublicKey.Raw,
		RawSubject:               in.TBSCSR.Subject.FullBytes,

		Signature:          in.SignatureValue.RightAlign(),
		SignatureAlgorithm: SignatureAlgorithmFromAI(in.SignatureAlgorithm),

		PublicKeyAlgorithm: getPublicKeyAlgorithmFromOID(in.TBSCSR.PublicKey.Algorithm.Algorithm),

		Version:    in.TBSCSR.Version,
		Attributes: parseRawAttributes(in.TBSCSR.RawAttributes),
	}

	var err error
	out.PublicKey, err = parsePublicKey(out.PublicKeyAlgorithm, &in.TBSCSR.PublicKey)
	if err != nil {
		return nil, err
	}

	var subject pkix.RDNSequence
	if rest, err := asn1.Unmarshal(in.TBSCSR.Subject.FullBytes, &subject); err != nil {
		return nil, err
	} else if len(rest) != 0 {
		return nil, errors.New("x509: trailing data after X.509 Subject")
	}

	out.Subject.FillFromRDNSequence(&subject)

	if out.Extensions, err = parseCSRExtensions(in.TBSCSR.RawAttributes); err != nil {
		return nil, err
	}

	var nfe NonFatalErrors
	for _, extension := range out.Extensions {
		if extension.Id.Equal(OIDExtensionSubjectAltName) {
			out.DNSNames, out.EmailAddresses, out.IPAddresses, out.URIs, err = parseSANExtension(extension.Value, &nfe)
			if err != nil {
				return nil, err
			}
		}
	}

	return out, nil
}

// CheckSignature reports whether the signature on c is valid.
func (c *CertificateRequest) CheckSignature() error {
	return checkSignature(c.SignatureAlgorithm, c.RawTBSCertificateRequest, c.Signature, c.PublicKey)
}
