x509

package
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 Go to latest Published: Jun 9, 2011 License: BSD-3-Clause Imports: 14 Imported by: 0

Documentation

Overview

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

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func CreateCertificate 

func CreateCertificate(rand io.Reader, template, parent *Certificate, pub *rsa.PublicKey, priv *rsa.PrivateKey) (cert []byte, err os.Error)

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

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.

func MarshalPKCS1PrivateKey 

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

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

func ParseCRL 

func ParseCRL(crlBytes []byte) (certList *pkix.CertificateList, err os.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) (certList *pkix.CertificateList, err os.Error)

ParseDERCRL parses a DER encoded CRL from the given bytes.

func ParsePKCS1PrivateKey 

func ParsePKCS1PrivateKey(der []byte) (key *rsa.PrivateKey, err os.Error)

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

Types

type CertPool 

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

Roots is a set of certificates.

func NewCertPool 

func NewCertPool() *CertPool

NewCertPool returns a new, empty CertPool.

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 root certificates. It appends any certificates found to s and returns true if any certificates were successfully parsed.

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

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.

	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

	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

	SubjectKeyId   []byte
	AuthorityKeyId []byte

	// Subject Alternate Name values
	DNSNames       []string
	EmailAddresses []string

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

	PolicyIdentifiers []asn1.ObjectIdentifier
}

A Certificate represents an X.509 certificate.

func ParseCertificate 

func ParseCertificate(asn1Data []byte) (*Certificate, os.Error)

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

func ParseCertificates 

func ParseCertificates(asn1Data []byte) ([]*Certificate, os.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) (err os.Error)

CheckCRLSignature checks that the signature in crl is from c.

func (*Certificate) CheckSignature 

func (c *Certificate) CheckSignature(algo SignatureAlgorithm, signed, signature []byte) (err os.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) (err os.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 *rsa.PrivateKey, revokedCerts []pkix.RevokedCertificate, now, expiry *time.Time) (crlBytes []byte, err os.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 os.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 chains where the first element of the chain is c and the last element is from opts.Roots.

WARNING: this doesn't do any revocation checking.

func (*Certificate) VerifyHostname 

func (c *Certificate) VerifyHostname(h string) os.Error

VerifyHostname returns nil if c is a valid certificate for the named host. Otherwise it returns an os.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) String 

func (e CertificateInvalidError) String() string

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) String 

func (ConstraintViolationError) String() 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
	ExtKeyUsageTimeStamping
	ExtKeyUsageOCSPSigning
)

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) String 

func (h HostnameError) String() 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
)

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 PublicKeyAlgorithm 

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

type SignatureAlgorithm 

type SignatureAlgorithm int
const (
	UnknownSignatureAlgorithm SignatureAlgorithm = iota
	MD2WithRSA
	MD5WithRSA
	SHA1WithRSA
	SHA256WithRSA
	SHA384WithRSA
	SHA512WithRSA
	DSAWithSHA1
	DSAWithSHA256
)

type UnhandledCriticalExtension 

type UnhandledCriticalExtension struct{}

func (UnhandledCriticalExtension) String 

func (h UnhandledCriticalExtension) String() string

type UnknownAuthorityError 

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

UnknownAuthorityError results when the certificate issuer is unknown

func (UnknownAuthorityError) String 

func (e UnknownAuthorityError) String() string

type UnsupportedAlgorithmError 

type UnsupportedAlgorithmError struct{}

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

func (UnsupportedAlgorithmError) String 

func (UnsupportedAlgorithmError) String() string

type VerifyOptions 

type VerifyOptions struct {
	DNSName       string
	Intermediates *CertPool
	Roots         *CertPool
	CurrentTime   int64 // if 0, the current system time is used.
}

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

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.

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