sm2

package
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 Go to latest Published: Jun 14, 2022 License: Apache-2.0 Imports: 37 Imported by: 0

Documentation

Overview

crypto/x509 add sm2 support

Index

Constants

This section is empty.

Variables

View Source 
var ErrUnsupportedAlgorithm = errors.New("x509: cannot verify signature: algorithm unimplemented")

ErrUnsupportedAlgorithm results from attempting to perform an operation that involves algorithms that are not currently implemented.

Functions

func Compress 

func Compress(a *PublicKey) []byte

func CreateCertificate 

func CreateCertificate(rand io.Reader, template, parent *Certificate, pub, priv interface{}) (cert []byte, err error)

CreateCertificate creates a new certificate based on a template. The following members of template are used: SerialNumber, Subject, NotBefore, NotAfter, KeyUsage, ExtKeyUsage, UnknownExtKeyUsage, BasicConstraintsValid, IsCA, MaxPathLen, SubjectKeyId, DNSNames, PermittedDNSDomainsCritical, PermittedDNSDomains, SignatureAlgorithm.

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.)

func CreateCertificateRequest 

func CreateCertificateRequest(rand io.Reader, template *CertificateRequest, priv interface{}) (csr []byte, err error)

CreateCertificateRequest creates a new certificate request based on a template. The following members of template are used: Subject, Attributes, SignatureAlgorithm, Extensions, DNSNames, EmailAddresses, and IPAddresses. 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 CreateCertificateRequestToMem 

func CreateCertificateRequestToMem(template *CertificateRequest, privKey *PrivateKey) ([]byte, error)

func CreateCertificateRequestToPem 

func CreateCertificateRequestToPem(FileName string, template *CertificateRequest,
	privKey *PrivateKey) (bool, error)

func CreateCertificateToMem 

func CreateCertificateToMem(template, parent *Certificate, pubKey *PublicKey, privKey *PrivateKey) ([]byte, error)

func CreateCertificateToPem 

func CreateCertificateToPem(FileName string, template, parent *Certificate, pubKey *PublicKey, privKey *PrivateKey) (bool, error)

func Decrypt 

func Decrypt(priv *PrivateKey, data []byte) ([]byte, error)

func Encrypt 

func Encrypt(pub *PublicKey, data []byte) ([]byte, error)

* sm2密文结构如下: * x * y * hash * CipherText

func MarshalPKCS1PrivateKey 

func MarshalPKCS1PrivateKey(key *rsa.PrivateKey) []byte

MarshalPKCS1PrivateKey converts a private key to ASN.1 DER encoded form.

func MarshalPKIXPublicKey 

func MarshalPKIXPublicKey(pub interface{}) ([]byte, error)

MarshalPKIXPublicKey serialises a public key to DER-encoded PKIX format.

func MarshalSm2EcryptedPrivateKey 

func MarshalSm2EcryptedPrivateKey(PrivKey *PrivateKey, pwd []byte) ([]byte, error)

func MarshalSm2PrivateKey 

func MarshalSm2PrivateKey(key *PrivateKey, pwd []byte) ([]byte, error)

func MarshalSm2PublicKey 

func MarshalSm2PublicKey(key *PublicKey) ([]byte, error)

func MarshalSm2UnecryptedPrivateKey 

func MarshalSm2UnecryptedPrivateKey(key *PrivateKey) ([]byte, error)

func P256Sm2 

func P256Sm2() elliptic.Curve

func ParseCRL 

func ParseCRL(crlBytes []byte) (*pkix.CertificateList, error)

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 ParseDERCRL 

func ParseDERCRL(derBytes []byte) (*pkix.CertificateList, error)

ParseDERCRL parses a DER encoded CRL from the given bytes.

func ParsePKCS1PrivateKey 

func ParsePKCS1PrivateKey(der []byte) (*rsa.PrivateKey, error)

ParsePKCS1PrivateKey returns an RSA private key from its ASN.1 PKCS#1 DER encoded form.

func ParsePKIXPublicKey 

func ParsePKIXPublicKey(derBytes []byte) (pub interface{}, err error)

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 RegisterHash 

func RegisterHash(h Hash, f func() hash.Hash)

RegisterHash registers a function that returns a new instance of the given hash function. This is intended to be called from the init function in packages that implement hash functions.

func Sign 

func Sign(priv *PrivateKey, hash []byte) (r, s *big.Int, err error)

func SignDataToSignDigit 

func SignDataToSignDigit(sign []byte) (*big.Int, *big.Int, error)

func SignDigitToSignData 

func SignDigitToSignData(r, s *big.Int) ([]byte, error)

func Sm2Sign 

func Sm2Sign(priv *PrivateKey, msg, uid []byte) (r, s *big.Int, err error)

func Sm2Verify 

func Sm2Verify(pub *PublicKey, msg, uid []byte, r, s *big.Int) bool

func Verify 

func Verify(pub *PublicKey, hash []byte, r, s *big.Int) bool

func WritePrivateKeytoMem 

func WritePrivateKeytoMem(key *PrivateKey, pwd []byte) ([]byte, error)

func WritePrivateKeytoPem 

func WritePrivateKeytoPem(FileName string, key *PrivateKey, pwd []byte) (bool, error)

func WritePublicKeytoMem 

func WritePublicKeytoMem(key *PublicKey, _ []byte) ([]byte, error)

func WritePublicKeytoPem 

func WritePublicKeytoPem(FileName string, key *PublicKey, _ []byte) (bool, error)

func ZA 

func ZA(pub *PublicKey, uid []byte) ([]byte, error)

ZA = H256(ENTLA || IDA || a || b || xG || yG || xA || yA)

Types

type CertPool 

type CertPool struct {
	// contains filtered or unexported fields
}

CertPool is a set of certificates.

func NewCertPool 

func NewCertPool() *CertPool

NewCertPool returns a new, empty CertPool.

func SystemCertPool 

func SystemCertPool() (*CertPool, error)

SystemCertPool returns a copy of the system cert pool.

Any mutations to the returned pool are not written to disk and do not affect any other pool.

func (*CertPool) AddCert 

func (s *CertPool) AddCert(cert *Certificate)

AddCert adds a certificate to a pool.

func (*CertPool) AppendCertsFromPEM 

func (s *CertPool) AppendCertsFromPEM(pemCerts []byte) (ok bool)

AppendCertsFromPEM attempts to parse a series of PEM encoded certificates. It appends any certificates found to s and reports whether any certificates were successfully parsed.

On many Linux systems, /etc/ssl/cert.pem will contain the system wide set of root CAs in a format suitable for this function.

func (*CertPool) Subjects 

func (s *CertPool) Subjects() [][]byte

Subjects returns a list of the DER-encoded subjects of all of the certificates in the pool.

type 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 bool // if true then the next two fields are valid.
	IsCA                  bool
	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

	// Name constraints
	PermittedDNSDomainsCritical bool // if true then the name constraints are marked critical.
	PermittedDNSDomains         []string

	// CRL Distribution Points
	CRLDistributionPoints []string

	PolicyIdentifiers []asn1.ObjectIdentifier
}

A Certificate represents an X.509 certificate.

func ParseCertificate 

func ParseCertificate(asn1Data []byte) (*Certificate, error)

ParseCertificate parses a single certificate from the given ASN.1 DER data.

func ParseCertificates 

func ParseCertificates(asn1Data []byte) ([]*Certificate, error)

ParseCertificates parses one or more certificates from the given ASN.1 DER data. The certificates must be concatenated with no intermediate padding.

func ReadCertificateFromMem 

func ReadCertificateFromMem(data []byte) (*Certificate, error)

func ReadCertificateFromPem 

func ReadCertificateFromPem(FileName string) (*Certificate, error)

func (*Certificate) CheckCRLSignature 

func (c *Certificate) CheckCRLSignature(crl *pkix.CertificateList) error

CheckCRLSignature checks that the signature in crl is from c.

func (*Certificate) CheckSignature 

func (c *Certificate) CheckSignature(algo SignatureAlgorithm, signed, signature []byte) error

CheckSignature verifies that signature is a valid signature over signed from c's public key.

func (*Certificate) CheckSignatureFrom 

func (c *Certificate) CheckSignatureFrom(parent *Certificate) error

CheckSignatureFrom verifies that the signature on c is a valid signature from parent.

func (*Certificate) CreateCRL 

func (c *Certificate) CreateCRL(rand io.Reader, priv interface{}, revokedCerts []pkix.RevokedCertificate, now, expiry time.Time) (crlBytes []byte, err error)

CreateCRL returns a DER encoded CRL, signed by this Certificate, that contains the given list of revoked certificates.

func (*Certificate) Equal 

func (c *Certificate) Equal(other *Certificate) bool

func (*Certificate) Verify 

func (c *Certificate) Verify(opts VerifyOptions) (chains [][]*Certificate, err error)

Verify attempts to verify c by building one or more chains from c to a certificate in opts.Roots, using certificates in opts.Intermediates if needed. If successful, it returns one or more chains where the first element of the chain is c and the last element is from opts.Roots.

If opts.Roots is nil and system roots are unavailable the returned error will be of type SystemRootsError.

WARNING: this doesn't do any revocation checking.

func (*Certificate) VerifyHostname 

func (c *Certificate) VerifyHostname(h string) error

VerifyHostname returns nil if c is a valid certificate for the named host. Otherwise it returns an error describing the mismatch.

type CertificateInvalidError 

type CertificateInvalidError struct {
	Cert   *Certificate
	Reason InvalidReason
}

CertificateInvalidError results when an odd error occurs. Users of this library probably want to handle all these errors uniformly.

func (CertificateInvalidError) Error 

func (e CertificateInvalidError) Error() string

type CertificateRequest 

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
}

CertificateRequest represents a PKCS #10, certificate signature request.

func ParseCertificateRequest 

func ParseCertificateRequest(asn1Data []byte) (*CertificateRequest, error)

ParseCertificateRequest parses a single certificate request from the given ASN.1 DER data.

func ReadCertificateRequestFromMem 

func ReadCertificateRequestFromMem(data []byte) (*CertificateRequest, error)

func ReadCertificateRequestFromPem 

func ReadCertificateRequestFromPem(FileName string) (*CertificateRequest, error)

func (*CertificateRequest) CheckSignature 

func (c *CertificateRequest) CheckSignature() error

CheckSignature reports whether the signature on c is valid.

type ConstraintViolationError 

type ConstraintViolationError struct{}

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.

func (ConstraintViolationError) Error 

func (ConstraintViolationError) Error() string

type EncryptedPrivateKeyInfo 

type EncryptedPrivateKeyInfo struct {
	EncryptionAlgorithm Pbes2Algorithms
	EncryptedData       []byte
}

reference to https://www.rfc-editor.org/rfc/rfc5958.txt

type ExtKeyUsage 

type ExtKeyUsage int

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

const (
	ExtKeyUsageAny ExtKeyUsage = iota
	ExtKeyUsageServerAuth
	ExtKeyUsageClientAuth
	ExtKeyUsageCodeSigning
	ExtKeyUsageEmailProtection
	ExtKeyUsageIPSECEndSystem
	ExtKeyUsageIPSECTunnel
	ExtKeyUsageIPSECUser
	ExtKeyUsageTimeStamping
	ExtKeyUsageOCSPSigning
	ExtKeyUsageMicrosoftServerGatedCrypto
	ExtKeyUsageNetscapeServerGatedCrypto
)

type Hash 

type Hash uint
const (
	MD4        Hash = 1 + iota // import golang.org/x/crypto/md4
	MD5                        // import crypto/md5
	SHA1                       // import crypto/sha1
	SHA224                     // import crypto/sha256
	SHA256                     // import crypto/sha256
	SHA384                     // import crypto/sha512
	SHA512                     // import crypto/sha512
	MD5SHA1                    // no implementation; MD5+SHA1 used for TLS RSA
	RIPEMD160                  // import golang.org/x/crypto/ripemd160
	SHA3_224                   // import golang.org/x/crypto/sha3
	SHA3_256                   // import golang.org/x/crypto/sha3
	SHA3_384                   // import golang.org/x/crypto/sha3
	SHA3_512                   // import golang.org/x/crypto/sha3
	SHA512_224                 // import crypto/sha512
	SHA512_256                 // import crypto/sha512
	SM3
)

func (Hash) Available 

func (h Hash) Available() bool

Available reports whether the given hash function is linked into the binary.

func (Hash) HashFunc 

func (h Hash) HashFunc() crypto.Hash

HashFunc simply returns the value of h so that Hash implements SignerOpts.

func (Hash) New 

func (h Hash) New() hash.Hash

New returns a new hash.Hash calculating the given hash function. New panics if the hash function is not linked into the binary.

func (Hash) Size 

func (h Hash) Size() int

Size returns the length, in bytes, of a digest resulting from the given hash function. It doesn't require that the hash function in question be linked into the program.

type HostnameError 

type HostnameError struct {
	Certificate *Certificate
	Host        string
}

HostnameError results when the set of authorized names doesn't match the requested name.

func (HostnameError) Error 

func (h HostnameError) Error() string

type InsecureAlgorithmError 

type InsecureAlgorithmError SignatureAlgorithm

An InsecureAlgorithmError

func (InsecureAlgorithmError) Error 

func (e InsecureAlgorithmError) Error() string

type InvalidReason 

type InvalidReason int
const (
	// NotAuthorizedToSign results when a certificate is signed by another
	// which isn't marked as a CA certificate.
	NotAuthorizedToSign InvalidReason = iota
	// Expired results when a certificate has expired, based on the time
	// given in the VerifyOptions.
	Expired
	// CANotAuthorizedForThisName results when an intermediate or root
	// certificate has a name constraint which doesn't include the name
	// being checked.
	CANotAuthorizedForThisName
	// TooManyIntermediates results when a path length constraint is
	// violated.
	TooManyIntermediates
	// IncompatibleUsage results when the certificate's key usage indicates
	// that it may only be used for a different purpose.
	IncompatibleUsage
	// NameMismatch results when the subject name of a parent certificate
	// does not match the issuer name in the child.
	NameMismatch
)

type KeyUsage 

type KeyUsage int

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

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

type Pbes2Algorithms 

type Pbes2Algorithms struct {
	IdPBES2     asn1.ObjectIdentifier
	Pbes2Params Pbes2Params
}

reference to https://www.ietf.org/rfc/rfc2898.txt

type Pbes2Encs 

type Pbes2Encs struct {
	EncryAlgo asn1.ObjectIdentifier
	IV        []byte
}

type Pbes2KDfs 

type Pbes2KDfs struct {
	IdPBKDF2    asn1.ObjectIdentifier
	Pkdf2Params Pkdf2Params
}

reference to https://www.ietf.org/rfc/rfc2898.txt

type Pbes2Params 

type Pbes2Params struct {
	KeyDerivationFunc Pbes2KDfs // PBES2-KDFs
	EncryptionScheme  Pbes2Encs // PBES2-Encs
}

reference to https://www.ietf.org/rfc/rfc2898.txt

type Pkdf2Params 

type Pkdf2Params struct {
	Salt           []byte
	IterationCount int
	Prf            pkix.AlgorithmIdentifier
}

reference to https://www.ietf.org/rfc/rfc2898.txt

type PrivateKey 

type PrivateKey struct {
	PublicKey
	D *big.Int
}

func GenerateKey 

func GenerateKey() (*PrivateKey, error)

func ParsePKCS8EcryptedPrivateKey 

func ParsePKCS8EcryptedPrivateKey(der, pwd []byte) (*PrivateKey, error)

func ParsePKCS8PrivateKey 

func ParsePKCS8PrivateKey(der, pwd []byte) (*PrivateKey, error)

func ParsePKCS8UnecryptedPrivateKey 

func ParsePKCS8UnecryptedPrivateKey(der []byte) (*PrivateKey, error)

func ParseSm2PrivateKey 

func ParseSm2PrivateKey(der []byte) (*PrivateKey, error)

func ReadPrivateKeyFromMem 

func ReadPrivateKeyFromMem(data []byte, pwd []byte) (*PrivateKey, error)

func ReadPrivateKeyFromPem 

func ReadPrivateKeyFromPem(FileName string, pwd []byte) (*PrivateKey, error)

func (*PrivateKey) Decrypt 

func (priv *PrivateKey) Decrypt(data []byte) ([]byte, error)

func (*PrivateKey) Public 

func (priv *PrivateKey) Public() crypto.PublicKey

The SM2's private key contains the public key

func (*PrivateKey) Sign 

func (priv *PrivateKey) Sign(rand io.Reader, msg []byte, opts crypto.SignerOpts) ([]byte, error)

sign format = 30 + len(z) + 02 + len(r) + r + 02 + len(s) + s, z being what follows its size, ie 02+len(r)+r+02+len(s)+s

type PrivateKeyInfo 

type PrivateKeyInfo struct {
	Version             int // v1 or v2
	PrivateKeyAlgorithm []asn1.ObjectIdentifier
	PrivateKey          []byte
}

reference to https://www.rfc-editor.org/rfc/rfc5958.txt

type PublicKey 

type PublicKey struct {
	elliptic.Curve
	X, Y *big.Int
}

func Decompress 

func Decompress(a []byte) *PublicKey

func ParseSm2PublicKey 

func ParseSm2PublicKey(der []byte) (*PublicKey, error)

func ReadPublicKeyFromMem 

func ReadPublicKeyFromMem(data []byte, _ []byte) (*PublicKey, error)

func ReadPublicKeyFromPem 

func ReadPublicKeyFromPem(FileName string, pwd []byte) (*PublicKey, error)

func (*PublicKey) Encrypt 

func (pub *PublicKey) Encrypt(data []byte) ([]byte, error)

func (*PublicKey) Verify 

func (pub *PublicKey) Verify(msg []byte, sign []byte) bool

type PublicKeyAlgorithm 

type PublicKeyAlgorithm int
const (
	UnknownPublicKeyAlgorithm PublicKeyAlgorithm = iota
	RSA
	DSA
	ECDSA
)

type SignatureAlgorithm 

type SignatureAlgorithm int
const (
	UnknownSignatureAlgorithm SignatureAlgorithm = iota
	MD2WithRSA
	MD5WithRSA
	//	SM3WithRSA reserve
	SHA1WithRSA
	SHA256WithRSA
	SHA384WithRSA
	SHA512WithRSA
	DSAWithSHA1
	DSAWithSHA256
	ECDSAWithSHA1
	ECDSAWithSHA256
	ECDSAWithSHA384
	ECDSAWithSHA512
	SHA256WithRSAPSS
	SHA384WithRSAPSS
	SHA512WithRSAPSS
	SM2WithSM3
	SM2WithSHA1
	SM2WithSHA256
)

func (SignatureAlgorithm) String 

func (algo SignatureAlgorithm) String() string

type SystemRootsError 

type SystemRootsError struct {
	Err error
}

SystemRootsError results when we fail to load the system root certificates.

func (SystemRootsError) Error 

func (se SystemRootsError) Error() string

type UnhandledCriticalExtension 

type UnhandledCriticalExtension struct{}

func (UnhandledCriticalExtension) Error 

func (h UnhandledCriticalExtension) Error() string

type UnknownAuthorityError 

type UnknownAuthorityError struct {
	Cert *Certificate
	// contains filtered or unexported fields
}

UnknownAuthorityError results when the certificate issuer is unknown

func (UnknownAuthorityError) Error 

func (e UnknownAuthorityError) Error() string

type VerifyOptions 

type VerifyOptions struct {
	DNSName       string
	Intermediates *CertPool
	Roots         *CertPool // if nil, the system roots are used
	CurrentTime   time.Time // if zero, the current time is used
	// KeyUsage specifies which Extended Key Usage values are acceptable.
	// An empty list means ExtKeyUsageServerAuth. Key usage is considered a
	// constraint down the chain which mirrors Windows CryptoAPI behavior,
	// but not the spec. To accept any key usage, include ExtKeyUsageAny.
	KeyUsages []ExtKeyUsage
}

VerifyOptions contains parameters for Certificate.Verify. It's a structure because other PKIX verification APIs have ended up needing many options.

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