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https://github.com/golang/go
synced 2024-11-12 10:30:23 -07:00
crypto/x509: support DSA public keys in X.509 certs.
R=agl CC=golang-dev https://golang.org/cl/4517072
This commit is contained in:
Adam Langley
parent
3587085fb7
commit
d84415d8f0
@ -11,6 +11,7 @@ import (
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"bytes"
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"container/vector"
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"crypto"
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"crypto/dsa"
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"crypto/rsa"
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"crypto/sha1"
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"crypto/x509/crl"
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@ -168,8 +169,13 @@ type tbsCertificate struct {
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Extensions []extension "optional,explicit,tag:3"
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}
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type dsaAlgorithmParameters struct {
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P, Q, G asn1.RawValue
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}
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type algorithmIdentifier struct {
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Algorithm asn1.ObjectIdentifier
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Algorithm asn1.ObjectIdentifier
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Parameters asn1.RawValue "optional"
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}
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type rdnSequence []relativeDistinguishedNameSET
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@ -219,6 +225,7 @@ type PublicKeyAlgorithm int
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const (
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UnknownPublicKeyAlgorithm PublicKeyAlgorithm = iota
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RSA
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DSA
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)
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// Name represents an X.509 distinguished name. This only includes the common
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@ -337,15 +344,27 @@ func getSignatureAlgorithmFromOID(oid []int) SignatureAlgorithm {
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return UnknownSignatureAlgorithm
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}
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func getPublicKeyAlgorithmFromOID(oid []int) PublicKeyAlgorithm {
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if len(oid) == 7 && oid[0] == 1 && oid[1] == 2 && oid[2] == 840 &&
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oid[3] == 113549 && oid[4] == 1 && oid[5] == 1 {
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switch oid[6] {
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case 1:
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return RSA
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}
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}
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// RFC 3279, 2.3 Public Key Algorithms
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//
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// pkcs-1 OBJECT IDENTIFIER ::== { iso(1) member-body(2) us(840)
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// rsadsi(113549) pkcs(1) 1 }
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//
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// rsaEncryption OBJECT IDENTIFIER ::== { pkcs1-1 1 }
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//
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// id-dsa OBJECT IDENTIFIER ::== { iso(1) member-body(2) us(840)
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// x9-57(10040) x9cm(4) 1 }
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var (
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oidPublicKeyRsa = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 1}
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oidPublicKeyDsa = asn1.ObjectIdentifier{1, 2, 840, 10040, 4, 1}
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)
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func getPublicKeyAlgorithmFromOID(oid asn1.ObjectIdentifier) PublicKeyAlgorithm {
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switch {
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case oid.Equal(oidPublicKeyRsa):
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return RSA
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case oid.Equal(oidPublicKeyDsa):
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return DSA
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}
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return UnknownPublicKeyAlgorithm
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}
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@ -562,7 +581,8 @@ type generalSubtree struct {
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Max int "optional,tag:1"
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}
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func parsePublicKey(algo PublicKeyAlgorithm, asn1Data []byte) (interface{}, os.Error) {
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func parsePublicKey(algo PublicKeyAlgorithm, keyData *publicKeyInfo) (interface{}, os.Error) {
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asn1Data := keyData.PublicKey.RightAlign()
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switch algo {
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case RSA:
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p := new(rsaPublicKey)
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@ -580,10 +600,38 @@ func parsePublicKey(algo PublicKeyAlgorithm, asn1Data []byte) (interface{}, os.E
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N: new(big.Int).SetBytes(p.N.Bytes),
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}
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return pub, nil
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case DSA:
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p := new(asn1.RawValue)
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_, err := asn1.Unmarshal(asn1Data, p)
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if err != nil {
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return nil, err
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}
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if !rawValueIsInteger(p) {
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return nil, asn1.StructuralError{"tags don't match"}
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}
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paramsData := keyData.Algorithm.Parameters.FullBytes
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params := new(dsaAlgorithmParameters)
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_, err = asn1.Unmarshal(paramsData, params)
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if err != nil {
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return nil, err
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}
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if !rawValueIsInteger(¶ms.P) ||
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!rawValueIsInteger(¶ms.Q) ||
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!rawValueIsInteger(¶ms.G) {
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return nil, asn1.StructuralError{"tags don't match"}
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}
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pub := &dsa.PublicKey{
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Parameters: dsa.Parameters{
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P: new(big.Int).SetBytes(params.P.Bytes),
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Q: new(big.Int).SetBytes(params.Q.Bytes),
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G: new(big.Int).SetBytes(params.G.Bytes),
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},
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Y: new(big.Int).SetBytes(p.Bytes),
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}
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return pub, nil
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default:
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return nil, nil
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}
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panic("unreachable")
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}
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@ -600,7 +648,7 @@ func parseCertificate(in *certificate) (*Certificate, os.Error) {
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out.PublicKeyAlgorithm =
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getPublicKeyAlgorithmFromOID(in.TBSCertificate.PublicKey.Algorithm.Algorithm)
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var err os.Error
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out.PublicKey, err = parsePublicKey(out.PublicKeyAlgorithm, in.TBSCertificate.PublicKey.PublicKey.RightAlign())
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out.PublicKey, err = parsePublicKey(out.PublicKeyAlgorithm, &in.TBSCertificate.PublicKey)
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if err != nil {
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return nil, err
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}
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@ -1004,11 +1052,11 @@ func CreateCertificate(rand io.Reader, template, parent *Certificate, pub *rsa.P
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c := tbsCertificate{
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Version: 2,
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SerialNumber: asn1.RawValue{Bytes: template.SerialNumber, Tag: 2},
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SignatureAlgorithm: algorithmIdentifier{oidSHA1WithRSA},
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SignatureAlgorithm: algorithmIdentifier{Algorithm: oidSHA1WithRSA},
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Issuer: parent.Subject.toRDNSequence(),
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Validity: validity{template.NotBefore, template.NotAfter},
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Subject: template.Subject.toRDNSequence(),
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PublicKey: publicKeyInfo{nil, algorithmIdentifier{oidRSA}, encodedPublicKey},
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PublicKey: publicKeyInfo{nil, algorithmIdentifier{Algorithm: oidRSA}, encodedPublicKey},
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Extensions: extensions,
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}
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@ -1031,7 +1079,7 @@ func CreateCertificate(rand io.Reader, template, parent *Certificate, pub *rsa.P
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cert, err = asn1.Marshal(certificate{
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nil,
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c,
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algorithmIdentifier{oidSHA1WithRSA},
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algorithmIdentifier{Algorithm: oidSHA1WithRSA},
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asn1.BitString{Bytes: signature, BitLength: len(signature) * 8},
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})
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return
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@ -7,6 +7,7 @@ package x509
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import (
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"asn1"
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"big"
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"crypto/dsa"
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"crypto/rand"
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"crypto/rsa"
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"encoding/hex"
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@ -54,6 +55,12 @@ func fromBase10(base10 string) *big.Int {
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return i
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}
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func bigFromHexString(s string) *big.Int {
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ret := new(big.Int)
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ret.SetString(s, 16)
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return ret
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}
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var rsaPrivateKey = &rsa.PrivateKey{
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PublicKey: rsa.PublicKey{
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N: bigFromString("9353930466774385905609975137998169297361893554149986716853295022578535724979677252958524466350471210367835187480748268864277464700638583474144061408845077"),
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@ -245,3 +252,58 @@ func TestCreateSelfSignedCertificate(t *testing.T) {
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return
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}
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}
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var dsaCertPem = `-----BEGIN CERTIFICATE-----
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MIIEDTCCA82gAwIBAgIJALHPghaoxeDhMAkGByqGSM44BAMweTELMAkGA1UEBhMC
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VVMxCzAJBgNVBAgTAk5DMQ8wDQYDVQQHEwZOZXd0b24xFDASBgNVBAoTC0dvb2ds
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ZSwgSW5jMRIwEAYDVQQDEwlKb24gQWxsaWUxIjAgBgkqhkiG9w0BCQEWE2pvbmFs
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bGllQGdvb2dsZS5jb20wHhcNMTEwNTE0MDMwMTQ1WhcNMTEwNjEzMDMwMTQ1WjB5
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MQswCQYDVQQGEwJVUzELMAkGA1UECBMCTkMxDzANBgNVBAcTBk5ld3RvbjEUMBIG
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A1UEChMLR29vZ2xlLCBJbmMxEjAQBgNVBAMTCUpvbiBBbGxpZTEiMCAGCSqGSIb3
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DQEJARYTam9uYWxsaWVAZ29vZ2xlLmNvbTCCAbcwggEsBgcqhkjOOAQBMIIBHwKB
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gQC8hLUnQ7FpFYu4WXTj6DKvXvz8QrJkNJCVMTpKAT7uBpobk32S5RrPKXocd4gN
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8lyGB9ggS03EVlEwXvSmO0DH2MQtke2jl9j1HLydClMf4sbx5V6TV9IFw505U1iW
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jL7awRMgxge+FsudtJK254FjMFo03ZnOQ8ZJJ9E6AEDrlwIVAJpnBn9moyP11Ox5
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Asc/5dnjb6dPAoGBAJFHd4KVv1iTVCvEG6gGiYop5DJh28hUQcN9kul+2A0yPUSC
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X93oN00P8Vh3eYgSaCWZsha7zDG53MrVJ0Zf6v/X/CoZNhLldeNOepivTRAzn+Rz
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kKUYy5l1sxYLHQKF0UGNCXfFKZT0PCmgU+PWhYNBBMn6/cIh44vp85ideo5CA4GE
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AAKBgFmifCafzeRaohYKXJgMGSEaggCVCRq5xdyDCat+wbOkjC4mfG01/um3G8u5
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LxasjlWRKTR/tcAL7t0QuokVyQaYdVypZXNaMtx1db7YBuHjj3aP+8JOQRI9xz8c
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bp5NDJ5pISiFOv4p3GZfqZPcqckDt78AtkQrmnal2txhhjF6o4HeMIHbMB0GA1Ud
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DgQWBBQVyyr7hO11ZFFpWX50298Sa3V+rzCBqwYDVR0jBIGjMIGggBQVyyr7hO11
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ZFFpWX50298Sa3V+r6F9pHsweTELMAkGA1UEBhMCVVMxCzAJBgNVBAgTAk5DMQ8w
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DQYDVQQHEwZOZXd0b24xFDASBgNVBAoTC0dvb2dsZSwgSW5jMRIwEAYDVQQDEwlK
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b24gQWxsaWUxIjAgBgkqhkiG9w0BCQEWE2pvbmFsbGllQGdvb2dsZS5jb22CCQCx
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z4IWqMXg4TAMBgNVHRMEBTADAQH/MAkGByqGSM44BAMDLwAwLAIUPtn/5j8Q1jJI
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7ggOIsgrhgUdjGQCFCsmDq1H11q9+9Wp9IMeGrTSKHIM
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-----END CERTIFICATE-----
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`
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func TestParseCertificateWithDsaPublicKey(t *testing.T) {
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expectedKey := &dsa.PublicKey{
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Parameters: dsa.Parameters{
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P: bigFromHexString("00BC84B52743B169158BB85974E3E832AF5EFCFC42B264349095313A4A013EEE069A1B937D92E51ACF297A1C77880DF25C8607D8204B4DC45651305EF4A63B40C7D8C42D91EDA397D8F51CBC9D0A531FE2C6F1E55E9357D205C39D395358968CBEDAC11320C607BE16CB9DB492B6E78163305A34DD99CE43C64927D13A0040EB97"),
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Q: bigFromHexString("009A67067F66A323F5D4EC7902C73FE5D9E36FA74F"),
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G: bigFromHexString("009147778295BF5893542BC41BA806898A29E43261DBC85441C37D92E97ED80D323D44825FDDE8374D0FF15877798812682599B216BBCC31B9DCCAD527465FEAFFD7FC2A193612E575E34E7A98AF4D10339FE47390A518CB9975B3160B1D0285D1418D0977C52994F43C29A053E3D685834104C9FAFDC221E38BE9F3989D7A8E42"),
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},
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Y: bigFromHexString("59A27C269FCDE45AA2160A5C980C19211A820095091AB9C5DC8309AB7EC1B3A48C2E267C6D35FEE9B71BCBB92F16AC8E559129347FB5C00BEEDD10BA8915C90698755CA965735A32DC7575BED806E1E38F768FFBC24E41123DC73F1C6E9E4D0C9E692128853AFE29DC665FA993DCA9C903B7BF00B6442B9A76A5DADC6186317A"),
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}
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pemBlock, _ := pem.Decode([]byte(dsaCertPem))
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cert, err := ParseCertificate(pemBlock.Bytes)
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if err != nil {
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t.Fatal("Failed to parse certificate: %s", err)
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}
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if cert.PublicKeyAlgorithm != DSA {
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t.Errorf("Parsed key algorithm was not DSA")
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}
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parsedKey, ok := cert.PublicKey.(*dsa.PublicKey)
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if !ok {
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t.Fatal("Parsed key was not a DSA key: %s", err)
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}
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if expectedKey.Y.Cmp(parsedKey.Y) != 0 ||
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expectedKey.P.Cmp(parsedKey.P) != 0 ||
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expectedKey.Q.Cmp(parsedKey.Q) != 0 ||
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expectedKey.G.Cmp(parsedKey.G) != 0 {
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t.Fatal("Parsed key differs from expected key")
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}
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}
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