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crypto/x509: allow ECDSA public keys to be marshaled.

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The public key serialization from CreateCertificate is factored out to be
used in MarshalPKIXPublicKey.
Testcode with one P224 ECDSA keypair has been added.

R=golang-dev, agl
CC=agl, golang-dev
https://golang.org/cl/13427044
This commit is contained in:
Nicholas Sullivan 2013-09-12 12:23:34 -04:00 committed by Adam Langley
parent 4c56457d58
commit 4874bc9b76
1 changed files with 41 additions and 39 deletions
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80
src/pkg/crypto/x509/x509.go
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@ -45,33 +45,55 @@ func ParsePKIXPublicKey(derBytes []byte) (pub interface{}, err error) {
return parsePublicKey(algo, &pki) return parsePublicKey(algo, &pki)
} }
// MarshalPKIXPublicKey serialises a public key to DER-encoded PKIX format. func marshalPublicKey(pub interface{}) (publicKeyBytes []byte, publicKeyAlgorithm pkix.AlgorithmIdentifier, err error) {
func MarshalPKIXPublicKey(pub interface{}) ([]byte, error) {
var pubBytes []byte
switch pub := pub.(type) { switch pub := pub.(type) {
case *rsa.PublicKey: case *rsa.PublicKey:
pubBytes, _ = asn1.Marshal(rsaPublicKey{ publicKeyBytes, err = asn1.Marshal(rsaPublicKey{
N: pub.N, N: pub.N,
E: pub.E, E: pub.E,
}) })
publicKeyAlgorithm.Algorithm = oidPublicKeyRSA
// This is a NULL parameters value which is technically
// superfluous, but most other code includes it and, by
// doing this, we match their public key hashes.
publicKeyAlgorithm.Parameters = asn1.RawValue{
Tag: 5,
}
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: default:
return nil, errors.New("x509: unknown public key type") 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{ pkix := pkixPublicKey{
Algo: pkix.AlgorithmIdentifier{ Algo: publicKeyAlgorithm,
Algorithm: []int{1, 2, 840, 113549, 1, 1, 1},
// This is a NULL parameters value which is technically
// superfluous, but most other code includes it and, by
// doing this, we match their public key hashes.
Parameters: asn1.RawValue{
Tag: 5,
},
},
BitString: asn1.BitString{ BitString: asn1.BitString{
Bytes: pubBytes, Bytes: publicKeyBytes,
BitLength: 8 * len(pubBytes), BitLength: 8 * len(publicKeyBytes),
}, },
} }
@ -1338,28 +1360,8 @@ func CreateCertificate(rand io.Reader, template, parent *Certificate, pub interf
var publicKeyBytes []byte var publicKeyBytes []byte
var publicKeyAlgorithm pkix.AlgorithmIdentifier var publicKeyAlgorithm pkix.AlgorithmIdentifier
switch pub := pub.(type) { if publicKeyBytes, publicKeyAlgorithm, err = marshalPublicKey(pub); err != nil {
case *rsa.PublicKey: return nil, err
publicKeyBytes, err = asn1.Marshal(rsaPublicKey{
N: pub.N,
E: pub.E,
})
publicKeyAlgorithm.Algorithm = oidPublicKeyRSA
case *ecdsa.PublicKey:
oid, ok := oidFromNamedCurve(pub.Curve)
if !ok {
return nil, errors.New("x509: unknown elliptic curve")
}
publicKeyAlgorithm.Algorithm = oidPublicKeyECDSA
var paramBytes []byte
paramBytes, err = asn1.Marshal(oid)
if err != nil {
return
}
publicKeyAlgorithm.Parameters.FullBytes = paramBytes
publicKeyBytes = elliptic.Marshal(pub.Curve, pub.X, pub.Y)
default:
return nil, errors.New("x509: only RSA and ECDSA public keys supported")
} }
var signatureAlgorithm pkix.AlgorithmIdentifier var signatureAlgorithm pkix.AlgorithmIdentifier