Imported Upstream version 2011-02-01.1upstream/2011-02-01.1

1 files changed, 18 insertions, 49 deletions

diff --git a/src/pkg/crypto/rsa/pkcs1v15.go b/src/pkg/crypto/rsa/pkcs1v15.go
index 714046250..2eaadee24 100644
--- a/src/pkg/crypto/rsa/pkcs1v15.go
+++ b/src/pkg/crypto/rsa/pkcs1v15.go
@@ -6,6 +6,7 @@ package rsa
 
 import (
 	"big"
+	"crypto"
 	"crypto/subtle"
 	"io"
 	"os"
@@ -139,19 +140,6 @@ func nonZeroRandomBytes(s []byte, rand io.Reader) (err os.Error) {
 	return
 }
 
-// Due to the design of PKCS#1 v1.5, we need to know the exact hash function in
-// use. A generic hash.Hash will not do.
-type PKCS1v15Hash int
-
-const (
-	HashMD5 PKCS1v15Hash = iota
-	HashSHA1
-	HashSHA256
-	HashSHA384
-	HashSHA512
-	HashMD5SHA1 // combined MD5 and SHA1 hash used for RSA signing in TLS.
-)
-
 // These are ASN1 DER structures:
 //   DigestInfo ::= SEQUENCE {
 //     digestAlgorithm AlgorithmIdentifier,
@@ -160,25 +148,20 @@ const (
 // For performance, we don't use the generic ASN1 encoder. Rather, we
 // precompute a prefix of the digest value that makes a valid ASN1 DER string
 // with the correct contents.
-var hashPrefixes = [][]byte{
-	// HashMD5
-	{0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05, 0x05, 0x00, 0x04, 0x10},
-	// HashSHA1
-	{0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14},
-	// HashSHA256
-	{0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20},
-	// HashSHA384
-	{0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05, 0x00, 0x04, 0x30},
-	// HashSHA512
-	{0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05, 0x00, 0x04, 0x40},
-	// HashMD5SHA1
-	{}, // A special TLS case which doesn't use an ASN1 prefix.
+var hashPrefixes = map[crypto.Hash][]byte{
+	crypto.MD5:       []byte{0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05, 0x05, 0x00, 0x04, 0x10},
+	crypto.SHA1:      []byte{0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14},
+	crypto.SHA256:    []byte{0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20},
+	crypto.SHA384:    []byte{0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05, 0x00, 0x04, 0x30},
+	crypto.SHA512:    {0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05, 0x00, 0x04, 0x40},
+	crypto.MD5SHA1:   {}, // A special TLS case which doesn't use an ASN1 prefix.
+	crypto.RIPEMD160: {0x30, 0x20, 0x30, 0x08, 0x06, 0x06, 0x28, 0xcf, 0x06, 0x03, 0x00, 0x31, 0x04, 0x14},
 }
 
-// SignPKCS1v15 calcuates the signature of hashed using RSASSA-PSS-SIGN from RSA PKCS#1 v1.5.
+// SignPKCS1v15 calculates the signature of hashed using RSASSA-PKCS1-V1_5-SIGN from RSA PKCS#1 v1.5.
 // Note that hashed must be the result of hashing the input message using the
 // given hash function.
-func SignPKCS1v15(rand io.Reader, priv *PrivateKey, hash PKCS1v15Hash, hashed []byte) (s []byte, err os.Error) {
+func SignPKCS1v15(rand io.Reader, priv *PrivateKey, hash crypto.Hash, hashed []byte) (s []byte, err os.Error) {
 	hashLen, prefix, err := pkcs1v15HashInfo(hash, len(hashed))
 	if err != nil {
 		return
@@ -211,7 +194,7 @@ func SignPKCS1v15(rand io.Reader, priv *PrivateKey, hash PKCS1v15Hash, hashed []
 // hashed is the result of hashing the input message using the given hash
 // function and sig is the signature. A valid signature is indicated by
 // returning a nil error.
-func VerifyPKCS1v15(pub *PublicKey, hash PKCS1v15Hash, hashed []byte, sig []byte) (err os.Error) {
+func VerifyPKCS1v15(pub *PublicKey, hash crypto.Hash, hashed []byte, sig []byte) (err os.Error) {
 	hashLen, prefix, err := pkcs1v15HashInfo(hash, len(hashed))
 	if err != nil {
 		return
@@ -246,28 +229,14 @@ func VerifyPKCS1v15(pub *PublicKey, hash PKCS1v15Hash, hashed []byte, sig []byte
 	return nil
 }
 
-func pkcs1v15HashInfo(hash PKCS1v15Hash, inLen int) (hashLen int, prefix []byte, err os.Error) {
-	switch hash {
-	case HashMD5:
-		hashLen = 16
-	case HashSHA1:
-		hashLen = 20
-	case HashSHA256:
-		hashLen = 32
-	case HashSHA384:
-		hashLen = 48
-	case HashSHA512:
-		hashLen = 64
-	case HashMD5SHA1:
-		hashLen = 36
-	default:
-		return 0, nil, os.ErrorString("unknown hash function")
-	}
-
+func pkcs1v15HashInfo(hash crypto.Hash, inLen int) (hashLen int, prefix []byte, err os.Error) {
+	hashLen = hash.Size()
 	if inLen != hashLen {
 		return 0, nil, os.ErrorString("input must be hashed message")
 	}
-
-	prefix = hashPrefixes[int(hash)]
+	prefix, ok := hashPrefixes[hash]
+	if !ok {
+		return 0, nil, os.ErrorString("unsupported hash function")
+	}
 	return
 }