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crypto: allocate less.

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The code in hash functions themselves could write directly into the
output buffer for a savings of about 50ns. But it's a little ugly so I
wasted a copy.

R=bradfitz
CC=golang-dev
https://golang.org/cl/5440111
This commit is contained in:
Adam Langley 2011-12-06 18:25:14 -05:00
parent 119592d80f
commit ba3c11f6db
4 changed files with 21 additions and 16 deletions
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14
cipher_suites.go
View File

@ -96,7 +96,7 @@ func macSHA1(version uint16, key []byte) macFunction {
type macFunction interface {
Size() int
MAC(seq, data []byte) []byte
MAC(digestBuf, seq, data []byte) []byte
}
// ssl30MAC implements the SSLv3 MAC function, as defined in
@ -114,7 +114,7 @@ var ssl30Pad1 = [48]byte{0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0
var ssl30Pad2 = [48]byte{0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c}
func (s ssl30MAC) MAC(seq, record []byte) []byte {
func (s ssl30MAC) MAC(digestBuf, seq, record []byte) []byte {
padLength := 48
if s.h.Size() == 20 {
padLength = 40
@ -127,13 +127,13 @@ func (s ssl30MAC) MAC(seq, record []byte) []byte {
s.h.Write(record[:1])
s.h.Write(record[3:5])
s.h.Write(record[recordHeaderLen:])
digest := s.h.Sum(nil)
digestBuf = s.h.Sum(digestBuf[:0])
s.h.Reset()
s.h.Write(s.key)
s.h.Write(ssl30Pad2[:padLength])
s.h.Write(digest)
return s.h.Sum(nil)
s.h.Write(digestBuf)
return s.h.Sum(digestBuf[:0])
}
// tls10MAC implements the TLS 1.0 MAC function. RFC 2246, section 6.2.3.
@ -145,11 +145,11 @@ func (s tls10MAC) Size() int {
return s.h.Size()
}
func (s tls10MAC) MAC(seq, record []byte) []byte {
func (s tls10MAC) MAC(digestBuf, seq, record []byte) []byte {
s.h.Reset()
s.h.Write(seq)
s.h.Write(record)
return s.h.Sum(nil)
return s.h.Sum(digestBuf[:0])
}
func rsaKA() keyAgreement {

9
conn.go
View File

@ -118,6 +118,9 @@ type halfConn struct {
nextCipher interface{} // next encryption state
nextMac macFunction // next MAC algorithm
// used to save allocating a new buffer for each MAC.
inDigestBuf, outDigestBuf []byte
}
// prepareCipherSpec sets the encryption and MAC states
@ -280,12 +283,13 @@ func (hc *halfConn) decrypt(b *block) (bool, alert) {
b.data[4] = byte(n)
b.resize(recordHeaderLen + n)
remoteMAC := payload[n:]
localMAC := hc.mac.MAC(hc.seq[0:], b.data)
localMAC := hc.mac.MAC(hc.inDigestBuf, hc.seq[0:], b.data)
hc.incSeq()
if subtle.ConstantTimeCompare(localMAC, remoteMAC) != 1 || paddingGood != 255 {
return false, alertBadRecordMAC
}
hc.inDigestBuf = localMAC
}
return true, 0
@ -312,12 +316,13 @@ func padToBlockSize(payload []byte, blockSize int) (prefix, finalBlock []byte) {
func (hc *halfConn) encrypt(b *block) (bool, alert) {
// mac
if hc.mac != nil {
mac := hc.mac.MAC(hc.seq[0:], b.data)
mac := hc.mac.MAC(hc.outDigestBuf, hc.seq[0:], b.data)
hc.incSeq()
n := len(b.data)
b.resize(n + len(mac))
copy(b.data[n:], mac)
hc.outDigestBuf = mac
}
payload := b.data[recordHeaderLen:]

8
handshake_client.go
View File

@ -231,10 +231,10 @@ func (c *Conn) clientHandshake() error {
if cert != nil {
certVerify := new(certificateVerifyMsg)
var digest [36]byte
copy(digest[0:16], finishedHash.serverMD5.Sum(nil))
copy(digest[16:36], finishedHash.serverSHA1.Sum(nil))
signed, err := rsa.SignPKCS1v15(c.config.rand(), c.config.Certificates[0].PrivateKey, crypto.MD5SHA1, digest[0:])
digest := make([]byte, 0, 36)
digest = finishedHash.serverMD5.Sum(digest)
digest = finishedHash.serverSHA1.Sum(digest)
signed, err := rsa.SignPKCS1v15(c.config.rand(), c.config.Certificates[0].PrivateKey, crypto.MD5SHA1, digest)
if err != nil {
return c.sendAlert(alertInternalError)
}

6
handshake_server.go
View File

@ -234,9 +234,9 @@ FindCipherSuite:
return c.sendAlert(alertUnexpectedMessage)
}
digest := make([]byte, 36)
copy(digest[0:16], finishedHash.serverMD5.Sum(nil))
copy(digest[16:36], finishedHash.serverSHA1.Sum(nil))
digest := make([]byte, 0, 36)
digest = finishedHash.serverMD5.Sum(digest)
digest = finishedHash.serverSHA1.Sum(digest)
err = rsa.VerifyPKCS1v15(pub, crypto.MD5SHA1, digest, certVerify.signature)
if err != nil {
c.sendAlert(alertBadCertificate)