crypto/x509 add sm2 support



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const (
	EncryptionAlgorithmDESCBC = iota


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var ContentEncryptionAlgorithm = EncryptionAlgorithmDESCBC

ContentEncryptionAlgorithm determines the algorithm used to encrypt the plaintext message. Change the value of this variable to change which algorithm is used in the Encrypt() function.

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var ErrNotEncryptedContent = errors.New("pkcs7: content data is a decryptable data type")

ErrNotEncryptedContent is returned when attempting to Decrypt data that is not encrypted data

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var ErrPKCS7UnsupportedAlgorithm = errors.New("pkcs7: cannot decrypt data: only RSA, DES, DES-EDE3, AES-256-CBC and AES-128-GCM supported")

ErrPKCS7UnsupportedAlgorithm tells you when our quick dev assumptions have failed

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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.

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var ErrUnsupportedContentType = errors.New("pkcs7: cannot parse data: unimplemented content type")

ErrUnsupportedContentType is returned when a PKCS7 content is not supported. Currently only Data (, Signed Data (, and Enveloped Data are supported (

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var ErrUnsupportedEncryptionAlgorithm = errors.New("pkcs7: cannot encrypt content: only DES-CBC and AES-128-GCM supported")

ErrUnsupportedEncryptionAlgorithm is returned when attempting to encrypt content with an unsupported algorithm.


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: AuthorityKeyId, BasicConstraintsValid, DNSNames, ExcludedDNSDomains, ExtKeyUsage, IsCA, KeyUsage, MaxPathLen, MaxPathLenZero, NotAfter, NotBefore, PermittedDNSDomains, PermittedDNSDomainsCritical, SerialNumber, SignatureAlgorithm, Subject, SubjectKeyId, and UnknownExtKeyUsage.

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 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 CreateCertificateRequestToMem2

func CreateCertificateRequestToMem2(template *CertificateRequest, privKey *sm2.PrivateKey) ([]byte, error)

func CreateCertificateRequestToPem

func CreateCertificateRequestToPem(FileName string, template *CertificateRequest, privKey *sm2.PrivateKey) error

func CreateCertificateToMem

func CreateCertificateToMem(template, parent *Certificate, pubKey *sm2.PublicKey, privKey *sm2.PrivateKey) ([]byte, error)

func CreateCertificateToPem

func CreateCertificateToPem(FileName string, template, parent *Certificate, pubKey *sm2.PublicKey, privKey *sm2.PrivateKey) error

func DegenerateCertificate

func DegenerateCertificate(cert []byte) ([]byte, error)

DegenerateCertificate creates a signed data structure containing only the provided certificate or certificate chain.

func MarshalECPrivateKey

func MarshalECPrivateKey(key interface{}) ([]byte, error)

MarshalECPrivateKey marshals an EC private key into ASN.1, DER format.

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 *sm2.PrivateKey, pwd []byte) ([]byte, error)

func MarshalSm2PrivateKey

func MarshalSm2PrivateKey(key *sm2.PrivateKey, pwd []byte) ([]byte, error)

func MarshalSm2PublicKey

func MarshalSm2PublicKey(key *sm2.PublicKey) ([]byte, error)

func MarshalSm2UnecryptedPrivateKey

func MarshalSm2UnecryptedPrivateKey(key *sm2.PrivateKey) ([]byte, error)

func PKCS7Encrypt

func PKCS7Encrypt(content []byte, recipients []*Certificate) ([]byte, error)

Encrypt creates and returns an envelope data PKCS7 structure with encrypted recipient keys for each recipient public key.

The algorithm used to perform encryption is determined by the current value of the global ContentEncryptionAlgorithm package variable. By default, the value is EncryptionAlgorithmDESCBC. To use a different algorithm, change the value before calling Encrypt(). For example:

ContentEncryptionAlgorithm = EncryptionAlgorithmAES128GCM

TODO(fullsailor): Add support for encrypting content with other algorithms

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 ParsePKCS8EcryptedPrivateKey

func ParsePKCS8EcryptedPrivateKey(der, pwd []byte) (*sm2.PrivateKey, error)

func ParsePKCS8PrivateKey

func ParsePKCS8PrivateKey(der, pwd []byte) (*sm2.PrivateKey, error)

func ParsePKCS8PrivateKey2

func ParsePKCS8PrivateKey2(der []byte) (key interface{}, err error)

ParsePKCS8PrivateKey parses an unencrypted, PKCS#8 private key. See RFC 5208.

func ParsePKCS8UnecryptedPrivateKey

func ParsePKCS8UnecryptedPrivateKey(der []byte) (*sm2.PrivateKey, error)

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 ParseSm2PrivateKey

func ParseSm2PrivateKey(der []byte) (*sm2.PrivateKey, error)

func ParseSm2PublicKey

func ParseSm2PublicKey(der []byte) (*sm2.PublicKey, error)

func ReadPrivateKeyFromPem

func ReadPrivateKeyFromPem(privateKeyPem []byte, pwd []byte) (*sm2.PrivateKey, error)

func ReadPublicKeyFromPem

func ReadPublicKeyFromPem(FileName string) (*sm2.PublicKey, error)

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 WritePrivateKeytoPem

func WritePrivateKeytoPem(key *sm2.PrivateKey, pwd []byte) ([]byte, error)

func WritePublicKeytoPem

func WritePublicKeytoPem(FileName string, key *sm2.PublicKey) error


type Attribute

type Attribute struct {
	Type  asn1.ObjectIdentifier
	Value interface{}

Attribute represents a key value pair attribute. Value must be marshalable byte `encoding/asn1`

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, (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
	ExcludedDNSDomains          []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 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

type EncryptedPrivateKeyInfo

type EncryptedPrivateKeyInfo struct {
	EncryptionAlgorithm Pbes2Algorithms
	EncryptedData       []byte

reference to

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

type Hash

type Hash uint
const (
	MD4        Hash = 1 + iota // import
	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
	SHA3_224                   // import
	SHA3_256                   // import
	SHA3_384                   // import
	SHA3_512                   // import
	SHA512_224                 // import crypto/sha512
	SHA512_256                 // import crypto/sha512

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.
	// CANotAuthorizedForThisName results when an intermediate or root
	// certificate has a name constraint which doesn't include the name
	// being checked.
	// TooManyIntermediates results when a path length constraint is
	// violated.
	// IncompatibleUsage results when the certificate's key usage indicates
	// that it may only be used for a different purpose.
	// NameMismatch results when the subject name of a parent certificate
	// does not match the issuer name in the child.

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

type MessageDigestMismatchError

type MessageDigestMismatchError struct {
	ExpectedDigest []byte
	ActualDigest   []byte

MessageDigestMismatchError is returned when the signer data digest does not match the computed digest for the contained content

func (*MessageDigestMismatchError) Error

func (err *MessageDigestMismatchError) Error() string

type PKCS7

type PKCS7 struct {
	Content      []byte
	Certificates []*Certificate
	CRLs         []pkix.CertificateList
	Signers      []signerInfo
	// contains filtered or unexported fields

PKCS7 Represents a PKCS7 structure

func ParsePKCS7

func ParsePKCS7(data []byte) (p7 *PKCS7, err error)

ParsePKCS7 decodes a DER encoded PKCS7.

func (*PKCS7) Decrypt

func (p7 *PKCS7) Decrypt(cert *Certificate, pk crypto.PrivateKey) ([]byte, error)

Decrypt decrypts encrypted content info for recipient cert and private key

func (*PKCS7) GetOnlySigner

func (p7 *PKCS7) GetOnlySigner() *Certificate

GetOnlySigner returns an x509.Certificate for the first signer of the signed data payload. If there are more or less than one signer, nil is returned

func (*PKCS7) UnmarshalSignedAttribute

func (p7 *PKCS7) UnmarshalSignedAttribute(attributeType asn1.ObjectIdentifier, out interface{}) error

UnmarshalSignedAttribute decodes a single attribute from the signer info

func (*PKCS7) Verify

func (p7 *PKCS7) Verify() (err error)

Verify checks the signatures of a PKCS7 object WARNING: Verify does not check signing time or verify certificate chains at this time.

type Pbes2Algorithms

type Pbes2Algorithms struct {
	IdPBES2     asn1.ObjectIdentifier
	Pbes2Params Pbes2Params

reference to

type Pbes2Encs

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

type Pbes2KDfs

type Pbes2KDfs struct {
	IdPBKDF2    asn1.ObjectIdentifier
	Pkdf2Params Pkdf2Params

reference to

type Pbes2Params

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

reference to

type Pkdf2Params

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

reference to

type PrivateKeyInfo

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

reference to

type PublicKeyAlgorithm

type PublicKeyAlgorithm int
const (
	UnknownPublicKeyAlgorithm PublicKeyAlgorithm = iota
	SM2 //add liuhy

func (PublicKeyAlgorithm) String

func (algo PublicKeyAlgorithm) String() string

type SignatureAlgorithm

type SignatureAlgorithm int
const (
	UnknownSignatureAlgorithm SignatureAlgorithm = iota
	//	SM3WithRSA reserve

func (SignatureAlgorithm) String

func (algo SignatureAlgorithm) String() string

type SignedData

type SignedData struct {
	// contains filtered or unexported fields

SignedData is an opaque data structure for creating signed data payloads

func NewSignedData

func NewSignedData(data []byte) (*SignedData, error)

NewSignedData initializes a SignedData with content

func (*SignedData) AddCertificate

func (sd *SignedData) AddCertificate(cert *Certificate)

AddCertificate adds the certificate to the payload. Useful for parent certificates

func (*SignedData) AddSigner

func (sd *SignedData) AddSigner(cert *Certificate, pkey crypto.PrivateKey, config SignerInfoConfig) error

AddSigner signs attributes about the content and adds certificate to payload

func (*SignedData) Detach

func (sd *SignedData) Detach()

Detach removes content from the signed data struct to make it a detached signature. This must be called right before Finish()

func (*SignedData) Finish

func (sd *SignedData) Finish() ([]byte, error)

Finish marshals the content and its signers

type SignerInfoConfig

type SignerInfoConfig struct {
	ExtraSignedAttributes []Attribute

SignerInfoConfig are optional values to include when adding a signer

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

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.