x509

package
v1.15.0 Latest Latest
Warning

This package is not in the latest version of its module.

 Go to latest Published: Sep 26, 2023 License: MIT Imports: 16 Imported by: 0

Documentation

Overview

Package x509 parses X.509-encoded keys and certificates.

Index

Examples

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.

View Source 
var IncorrectPasswordError = errors.New("x509: decryption password incorrect")

IncorrectPasswordError is returned when an incorrect password is detected.

Functions

func CreateCertificate 

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

CreateCertificate creates a new X.509v3 certificate based on a template. The following members of template are used:

  • AuthorityKeyId
  • BasicConstraintsValid
  • CRLDistributionPoints
  • DNSNames
  • EmailAddresses
  • ExcludedDNSDomains
  • ExcludedEmailAddresses
  • ExcludedIPRanges
  • ExcludedURIDomains
  • ExtKeyUsage
  • ExtraExtensions
  • IPAddresses
  • IsCA
  • IssuingCertificateURL
  • KeyUsage
  • MaxPathLen
  • MaxPathLenZero
  • NotAfter
  • NotBefore
  • OCSPServer
  • PermittedDNSDomains
  • PermittedDNSDomainsCritical
  • PermittedEmailAddresses
  • PermittedIPRanges
  • PermittedURIDomains
  • PolicyIdentifiers
  • SerialNumber
  • SignatureAlgorithm
  • Subject
  • SubjectKeyId
  • URIs
  • 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.

The currently supported key types are *rsa.PublicKey, *ecdsa.PublicKey and ed25519.PublicKey. pub must be a supported key type, and priv must be a crypto.Signer with a supported public key.

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.

If SubjectKeyId from template is empty and the template is a CA, SubjectKeyId will be generated from the hash of the public key.

func CreateCertificateRequest added in v1.3.0 

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:

  • SignatureAlgorithm
  • Subject
  • DNSNames
  • EmailAddresses
  • IPAddresses
  • URIs
  • ExtraExtensions
  • Attributes (deprecated)

priv is the private key to sign the CSR with, and the corresponding public key will be included in the CSR. It must implement crypto.Signer and its Public() method must return a *rsa.PublicKey or a *ecdsa.PublicKey or a ed25519.PublicKey. (A *rsa.PrivateKey, *ecdsa.PrivateKey or ed25519.PrivateKey satisfies this.)

The returned slice is the certificate request in DER encoding.

func CreateRevocationList added in v1.15.0 

func CreateRevocationList(rand io.Reader, template *RevocationList, issuer *Certificate, priv crypto.Signer) ([]byte, error)

CreateRevocationList creates a new X.509 v2 Certificate Revocation List, according to RFC 5280, based on template.

The CRL is signed by priv which should be the private key associated with the public key in the issuer certificate.

The issuer may not be nil, and the crlSign bit must be set in KeyUsage in order to use it as a CRL issuer.

The issuer distinguished name CRL field and authority key identifier extension are populated using the issuer certificate. issuer must have SubjectKeyId set.

func DecryptPEMBlock added in v1.1.0 

func DecryptPEMBlock(b *pem.Block, password []byte) ([]byte, error)

DecryptPEMBlock takes a password encrypted PEM block and the password used to encrypt it and returns a slice of decrypted DER encoded bytes. It inspects the DEK-Info header to determine the algorithm used for decryption. If no DEK-Info header is present, an error is returned. If an incorrect password is detected an IncorrectPasswordError is returned. Because of deficiencies in the encrypted-PEM format, it's not always possible to detect an incorrect password. In these cases no error will be returned but the decrypted DER bytes will be random noise.

func EncryptPEMBlock added in v1.1.0 

func EncryptPEMBlock(rand io.Reader, blockType string, data, password []byte, alg PEMCipher) (*pem.Block, error)

EncryptPEMBlock returns a PEM block of the specified type holding the given DER-encoded data encrypted with the specified algorithm and password.

func IsEncryptedPEMBlock added in v1.1.0 

func IsEncryptedPEMBlock(b *pem.Block) bool

IsEncryptedPEMBlock returns if the PEM block is password encrypted.

func MarshalECPrivateKey added in v1.2.0 

func MarshalECPrivateKey(key *ecdsa.PrivateKey) ([]byte, error)

MarshalECPrivateKey converts an EC private key to SEC 1, ASN.1 DER form.

This kind of key is commonly encoded in PEM blocks of type "EC PRIVATE KEY". For a more flexible key format which is not EC specific, use MarshalPKCS8PrivateKey.

func MarshalPKCS1PrivateKey 

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

MarshalPKCS1PrivateKey converts an RSA private key to PKCS #1, ASN.1 DER form.

This kind of key is commonly encoded in PEM blocks of type "RSA PRIVATE KEY". For a more flexible key format which is not RSA specific, use MarshalPKCS8PrivateKey.

func MarshalPKCS1PublicKey added in v1.10.0 

func MarshalPKCS1PublicKey(key *rsa.PublicKey) []byte

MarshalPKCS1PublicKey converts an RSA public key to PKCS #1, ASN.1 DER form.

This kind of key is commonly encoded in PEM blocks of type "RSA PUBLIC KEY".

func MarshalPKCS8PrivateKey added in v1.10.0 

func MarshalPKCS8PrivateKey(key interface{}) ([]byte, error)

MarshalPKCS8PrivateKey converts a private key to PKCS #8, ASN.1 DER form.

The following key types are currently supported: *rsa.PrivateKey, *ecdsa.PrivateKey and ed25519.PrivateKey. Unsupported key types result in an error.

This kind of key is commonly encoded in PEM blocks of type "PRIVATE KEY".

func MarshalPKIXPublicKey 

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

MarshalPKIXPublicKey converts a public key to PKIX, ASN.1 DER form. The encoded public key is a SubjectPublicKeyInfo structure (see RFC 5280, Section 4.1).

The following key types are currently supported: *rsa.PublicKey, *ecdsa.PublicKey and ed25519.PublicKey. Unsupported key types result in an error.

This kind of key is commonly encoded in PEM blocks of type "PUBLIC KEY".

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 ParseECPrivateKey added in v1.1.0 

func ParseECPrivateKey(der []byte) (*ecdsa.PrivateKey, error)

ParseECPrivateKey parses an EC private key in SEC 1, ASN.1 DER form.

This kind of key is commonly encoded in PEM blocks of type "EC PRIVATE KEY".

func ParsePKCS1PrivateKey 

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

ParsePKCS1PrivateKey parses an RSA private key in PKCS #1, ASN.1 DER form.

This kind of key is commonly encoded in PEM blocks of type "RSA PRIVATE KEY".

func ParsePKCS1PublicKey added in v1.10.0 

func ParsePKCS1PublicKey(der []byte) (*rsa.PublicKey, error)

ParsePKCS1PublicKey parses an RSA public key in PKCS #1, ASN.1 DER form.

This kind of key is commonly encoded in PEM blocks of type "RSA PUBLIC KEY".

func ParsePKCS8PrivateKey 

func ParsePKCS8PrivateKey(der []byte) (key interface{}, err error)

ParsePKCS8PrivateKey parses an unencrypted private key in PKCS #8, ASN.1 DER form.

It returns a *rsa.PrivateKey, a *ecdsa.PrivateKey, or a ed25519.PrivateKey. More types might be supported in the future.

This kind of key is commonly encoded in PEM blocks of type "PRIVATE KEY".

func ParsePKIXPublicKey 

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

ParsePKIXPublicKey parses a public key in PKIX, ASN.1 DER form. The encoded public key is a SubjectPublicKeyInfo structure (see RFC 5280, Section 4.1).

It returns a *rsa.PublicKey, *dsa.PublicKey, *ecdsa.PublicKey, or ed25519.PublicKey. More types might be supported in the future.

This kind of key is commonly encoded in PEM blocks of type "PUBLIC KEY".

Example 
package main

import (
	"crypto/dsa"
	"crypto/ecdsa"
	"crypto/ed25519"
	"crypto/rsa"
	"crypto/x509"
	"encoding/pem"
	"fmt"
)

func main() {
	const pubPEM = `
-----BEGIN PUBLIC KEY-----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-----END PUBLIC KEY-----`

	block, _ := pem.Decode([]byte(pubPEM))
	if block == nil {
		panic("failed to parse PEM block containing the public key")
	}

	pub, err := x509.ParsePKIXPublicKey(block.Bytes)
	if err != nil {
		panic("failed to parse DER encoded public key: " + err.Error())
	}

	switch pub := pub.(type) {
	case *rsa.PublicKey:
		fmt.Println("pub is of type RSA:", pub)
	case *dsa.PublicKey:
		fmt.Println("pub is of type DSA:", pub)
	case *ecdsa.PublicKey:
		fmt.Println("pub is of type ECDSA:", pub)
	case ed25519.PublicKey:
		fmt.Println("pub is of type Ed25519:", pub)
	default:
		panic("unknown type of public key")
	}
}

Output:

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 added in v1.7.0 

func SystemCertPool() (*CertPool, error)

SystemCertPool returns a copy of the system cert pool.

On Unix systems other than macOS 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. The latter can be a colon-separated list.

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

New changes in the system cert pool might not be reflected in subsequent calls.

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
	RawTBSCertificate       []byte
	RawSubjectPublicKeyInfo []byte
	RawSubject              []byte
	RawIssuer               []byte

	Signature          []byte
	SignatureAlgorithm SignatureAlgorithm

	PublicKeyAlgorithm PublicKeyAlgorithm
	PublicKey          interface{}

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

	Extensions []pkix.Extension

	ExtraExtensions []pkix.Extension

	UnhandledCriticalExtensions []asn1.ObjectIdentifier

	ExtKeyUsage        []ExtKeyUsage
	UnknownExtKeyUsage []asn1.ObjectIdentifier

	BasicConstraintsValid bool
	IsCA                  bool

	MaxPathLen int

	MaxPathLenZero bool

	SubjectKeyId   []byte
	AuthorityKeyId []byte

	OCSPServer            []string
	IssuingCertificateURL []string

	DNSNames       []string
	EmailAddresses []string
	IPAddresses    []net.IP
	URIs           []*url.URL

	PermittedDNSDomainsCritical bool
	PermittedDNSDomains         []string
	ExcludedDNSDomains          []string
	PermittedIPRanges           []*net.IPNet
	ExcludedIPRanges            []*net.IPNet
	PermittedEmailAddresses     []string
	ExcludedEmailAddresses      []string
	PermittedURIDomains         []string
	ExcludedURIDomains          []string

	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 (*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.

Note: this method does not generate an RFC 5280 conformant X.509 v2 CRL. To generate a standards compliant CRL, use CreateRevocationList instead.

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, the platform verifier might be used, and verification details might differ from what is described below. If system roots are unavailable the returned error will be of type SystemRootsError.

Name constraints in the intermediates will be applied to all names claimed in the chain, not just opts.DNSName. Thus it is invalid for a leaf to claim example.com if an intermediate doesn't permit it, even if example.com is not the name being validated. Note that DirectoryName constraints are not supported.

Name constraint validation follows the rules from RFC 5280, with the addition that DNS name constraints may use the leading period format defined for emails and URIs. When a constraint has a leading period it indicates that at least one additional label must be prepended to the constrained name to be considered valid.

Extended Key Usage values are enforced nested down a chain, so an intermediate or root that enumerates EKUs prevents a leaf from asserting an EKU not in that list. (While this is not specified, it is common practice in order to limit the types of certificates a CA can issue.)

WARNING: this function doesn't do any revocation checking.

Example 
package main

import (
	"crypto/x509"
	"encoding/pem"
)

func main() {
	// Verifying with a custom list of root certificates.

	const rootPEM = `
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----`

	const certPEM = `
-----BEGIN CERTIFICATE-----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==
-----END CERTIFICATE-----`

	// First, create the set of root certificates. For this example we only
	// have one. It's also possible to omit this in order to use the
	// default root set of the current operating system.
	roots := x509.NewCertPool()
	ok := roots.AppendCertsFromPEM([]byte(rootPEM))
	if !ok {
		panic("failed to parse root certificate")
	}

	block, _ := pem.Decode([]byte(certPEM))
	if block == nil {
		panic("failed to parse certificate PEM")
	}
	cert, err := x509.ParseCertificate(block.Bytes)
	if err != nil {
		panic("failed to parse certificate: " + err.Error())
	}

	opts := x509.VerifyOptions{
		DNSName: "mail.google.com",
		Roots:   roots,
	}

	if _, err := cert.Verify(opts); err != nil {
		panic("failed to verify certificate: " + err.Error())
	}
}

Output:

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.

IP addresses can be optionally enclosed in square brackets and are checked against the IPAddresses field. Other names are checked case insensitively against the DNSNames field. If the names are valid hostnames, the certificate fields can have a wildcard as the left-most label.

The legacy Common Name field is ignored unless it's a valid hostname, the certificate doesn't have any Subject Alternative Names, and the GODEBUG environment variable is set to "x509ignoreCN=0". Support for Common Name is deprecated will be entirely removed in the future.

type CertificateInvalidError 

type CertificateInvalidError struct {
	Cert   *Certificate
	Reason InvalidReason
	Detail string
}

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 added in v1.3.0 

type CertificateRequest struct {
	Raw                      []byte
	RawTBSCertificateRequest []byte
	RawSubjectPublicKeyInfo  []byte
	RawSubject               []byte

	Version            int
	Signature          []byte
	SignatureAlgorithm SignatureAlgorithm

	PublicKeyAlgorithm PublicKeyAlgorithm
	PublicKey          interface{}

	Subject pkix.Name

	Attributes []pkix.AttributeTypeAndValueSET

	Extensions []pkix.Extension

	ExtraExtensions []pkix.Extension

	DNSNames       []string
	EmailAddresses []string
	IPAddresses    []net.IP
	URIs           []*url.URL
}

CertificateRequest represents a PKCS #10, certificate signature request.

func ParseCertificateRequest added in v1.3.0 

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

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

func (*CertificateRequest) CheckSignature added in v1.5.0 

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 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
	ExtKeyUsageMicrosoftCommercialCodeSigning
	ExtKeyUsageMicrosoftKernelCodeSigning
)

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 added in v1.6.0 

type InsecureAlgorithmError SignatureAlgorithm

An InsecureAlgorithmError

func (InsecureAlgorithmError) Error added in v1.6.0 

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 permit a DNS or
	// other name (including IP address) in the leaf certificate.
	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
	// NameConstraintsWithoutSANs results when a leaf certificate doesn't
	// contain a Subject Alternative Name extension, but a CA certificate
	// contains name constraints, and the Common Name can be interpreted as
	// a hostname.
	//
	// This error is only returned when legacy Common Name matching is enabled
	// by setting the GODEBUG environment variable to "x509ignoreCN=1". This
	// setting might be removed in the future.
	NameConstraintsWithoutSANs
	// UnconstrainedName results when a CA certificate contains permitted
	// name constraints, but leaf certificate contains a name of an
	// unsupported or unconstrained type.
	UnconstrainedName
	// TooManyConstraints results when the number of comparison operations
	// needed to check a certificate exceeds the limit set by
	// VerifyOptions.MaxConstraintComparisions. This limit exists to
	// prevent pathological certificates can consuming excessive amounts of
	// CPU time to verify.
	TooManyConstraints
	// CANotAuthorizedForExtKeyUsage results when an intermediate or root
	// certificate does not permit a requested extended key usage.
	CANotAuthorizedForExtKeyUsage
)

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 PEMCipher added in v1.1.0 

type PEMCipher int
const (
	PEMCipherDES PEMCipher
	PEMCipher3DES
	PEMCipherAES128
	PEMCipherAES192
	PEMCipherAES256
)

Possible values for the EncryptPEMBlock encryption algorithm.

type PublicKeyAlgorithm 

type PublicKeyAlgorithm int
const (
	UnknownPublicKeyAlgorithm PublicKeyAlgorithm = iota
	RSA
	DSA
	ECDSA
	Ed25519
)

func (PublicKeyAlgorithm) String added in v1.10.0 

func (algo PublicKeyAlgorithm) String() string

type RevocationList added in v1.15.0 

type RevocationList struct {
	SignatureAlgorithm SignatureAlgorithm

	RevokedCertificates []pkix.RevokedCertificate

	Number *big.Int

	ThisUpdate time.Time

	NextUpdate time.Time

	ExtraExtensions []pkix.Extension
}

RevocationList contains the fields used to create an X.509 v2 Certificate Revocation list with CreateRevocationList.

type SignatureAlgorithm 

type SignatureAlgorithm int
const (
	UnknownSignatureAlgorithm SignatureAlgorithm = iota
	MD2WithRSA
	MD5WithRSA
	SHA1WithRSA
	SHA256WithRSA
	SHA384WithRSA
	SHA512WithRSA
	DSAWithSHA1
	DSAWithSHA256
	ECDSAWithSHA1
	ECDSAWithSHA256
	ECDSAWithSHA384
	ECDSAWithSHA512
	SHA256WithRSAPSS
	SHA384WithRSAPSS
	SHA512WithRSAPSS
	PureEd25519
)

func (SignatureAlgorithm) String added in v1.6.0 

func (algo SignatureAlgorithm) String() string

type SystemRootsError added in v1.1.0 

type SystemRootsError struct {
	Err error
}

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

func (SystemRootsError) Error added in v1.1.0 

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

	CurrentTime time.Time

	KeyUsages []ExtKeyUsage

	MaxConstraintComparisions int
}

VerifyOptions contains parameters for Certificate.Verify.

Source Files

View all Source files

Directories

Path Synopsis
Package pkix contains shared, low level structures used for ASN.1 parsing and serialization of X.509 certificates, CRL and OCSP.
 Package pkix contains shared, low level structures used for ASN.1 parsing and serialization of X.509 certificates, CRL and OCSP.

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
y or Y : Canonical URL
go.dev uses cookies from Google to deliver and enhance the quality of its services and to analyze traffic. Learn more.