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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 bf59f081c1
commit 554ac03637
12 changed files with 87 additions and 66 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/pkg/crypto/hmac/hmac.go
View File

@ -49,14 +49,13 @@ func (h *hmac) tmpPad(xor byte) {
}
func (h *hmac) Sum(in []byte) []byte {
sum := h.inner.Sum(nil)
origLen := len(in)
in = h.inner.Sum(in)
h.tmpPad(0x5c)
for i, b := range sum {
h.tmp[padSize+i] = b
}
copy(h.tmp[padSize:], in[origLen:])
h.outer.Reset()
h.outer.Write(h.tmp)
return h.outer.Sum(in)
return h.outer.Sum(in[:origLen])
}
func (h *hmac) Write(p []byte) (n int, err error) {

17
src/pkg/crypto/md5/md5.go
View File

@ -79,8 +79,7 @@ func (d *digest) Write(p []byte) (nn int, err error) {
func (d0 *digest) Sum(in []byte) []byte {
// Make a copy of d0 so that caller can keep writing and summing.
d := new(digest)
*d = *d0
d := *d0
// Padding. Add a 1 bit and 0 bits until 56 bytes mod 64.
len := d.len
@ -103,11 +102,13 @@ func (d0 *digest) Sum(in []byte) []byte {
panic("d.nx != 0")
}
for _, s := range d.s {
in = append(in, byte(s>>0))
in = append(in, byte(s>>8))
in = append(in, byte(s>>16))
in = append(in, byte(s>>24))
var digest [Size]byte
for i, s := range d.s {
digest[i*4] = byte(s)
digest[i*4+1] = byte(s >> 8)
digest[i*4+2] = byte(s >> 16)
digest[i*4+3] = byte(s >> 24)
}
return in
return append(in, digest[:]...)
}

8
src/pkg/crypto/openpgp/s2k/s2k.go
View File

@ -26,6 +26,7 @@ var zero [1]byte
// 4880, section 3.7.1.2) using the given hash, input passphrase and salt.
func Salted(out []byte, h hash.Hash, in []byte, salt []byte) {
done := 0
var digest []byte
for i := 0; done < len(out); i++ {
h.Reset()
@ -34,7 +35,8 @@ func Salted(out []byte, h hash.Hash, in []byte, salt []byte) {
}
h.Write(salt)
h.Write(in)
n := copy(out[done:], h.Sum(nil))
digest = h.Sum(digest[:0])
n := copy(out[done:], digest)
done += n
}
}
@ -52,6 +54,7 @@ func Iterated(out []byte, h hash.Hash, in []byte, salt []byte, count int) {
}
done := 0
var digest []byte
for i := 0; done < len(out); i++ {
h.Reset()
for j := 0; j < i; j++ {
@ -68,7 +71,8 @@ func Iterated(out []byte, h hash.Hash, in []byte, salt []byte, count int) {
written += len(combined)
}
}
n := copy(out[done:], h.Sum(nil))
digest = h.Sum(digest[:0])
n := copy(out[done:], digest)
done += n
}
}

17
src/pkg/crypto/ripemd160/ripemd160.go
View File

@ -83,8 +83,7 @@ func (d *digest) Write(p []byte) (nn int, err error) {
func (d0 *digest) Sum(in []byte) []byte {
// Make a copy of d0 so that caller can keep writing and summing.
d := new(digest)
*d = *d0
d := *d0
// Padding. Add a 1 bit and 0 bits until 56 bytes mod 64.
tc := d.tc
@ -107,11 +106,13 @@ func (d0 *digest) Sum(in []byte) []byte {
panic("d.nx != 0")
}
for _, s := range d.s {
in = append(in, byte(s))
in = append(in, byte(s>>8))
in = append(in, byte(s>>16))
in = append(in, byte(s>>24))
var digest [Size]byte
for i, s := range d.s {
digest[i*4] = byte(s)
digest[i*4+1] = byte(s >> 8)
digest[i*4+2] = byte(s >> 16)
digest[i*4+3] = byte(s >> 24)
}
return in
return append(in, digest[:]...)
}

3
src/pkg/crypto/rsa/rsa.go
View File

@ -189,12 +189,13 @@ func incCounter(c *[4]byte) {
// specified in PKCS#1 v2.1.
func mgf1XOR(out []byte, hash hash.Hash, seed []byte) {
var counter [4]byte
var digest []byte
done := 0
for done < len(out) {
hash.Write(seed)
hash.Write(counter[0:4])
digest := hash.Sum(nil)
digest = hash.Sum(digest[:0])
hash.Reset()
for i := 0; i < len(digest) && done < len(out); i++ {

17
src/pkg/crypto/sha1/sha1.go
View File

@ -81,8 +81,7 @@ func (d *digest) Write(p []byte) (nn int, err error) {
func (d0 *digest) Sum(in []byte) []byte {
// Make a copy of d0 so that caller can keep writing and summing.
d := new(digest)
*d = *d0
d := *d0
// Padding. Add a 1 bit and 0 bits until 56 bytes mod 64.
len := d.len
@ -105,11 +104,13 @@ func (d0 *digest) Sum(in []byte) []byte {
panic("d.nx != 0")
}
for _, s := range d.h {
in = append(in, byte(s>>24))
in = append(in, byte(s>>16))
in = append(in, byte(s>>8))
in = append(in, byte(s))
var digest [Size]byte
for i, s := range d.h {
digest[i*4] = byte(s >> 24)
digest[i*4+1] = byte(s >> 16)
digest[i*4+2] = byte(s >> 8)
digest[i*4+3] = byte(s)
}
return in
return append(in, digest[:]...)
}

20
src/pkg/crypto/sha256/sha256.go
View File

@ -125,8 +125,7 @@ func (d *digest) Write(p []byte) (nn int, err error) {
func (d0 *digest) Sum(in []byte) []byte {
// Make a copy of d0 so that caller can keep writing and summing.
d := new(digest)
*d = *d0
d := *d0
// Padding. Add a 1 bit and 0 bits until 56 bytes mod 64.
len := d.len
@ -150,14 +149,19 @@ func (d0 *digest) Sum(in []byte) []byte {
}
h := d.h[:]
size := Size
if d.is224 {
h = d.h[:7]
size = Size224
}
for _, s := range h {
in = append(in, byte(s>>24))
in = append(in, byte(s>>16))
in = append(in, byte(s>>8))
in = append(in, byte(s))
var digest [Size]byte
for i, s := range h {
digest[i*4] = byte(s >> 24)
digest[i*4+1] = byte(s >> 16)
digest[i*4+2] = byte(s >> 8)
digest[i*4+3] = byte(s)
}
return in
return append(in, digest[:size]...)
}

25
src/pkg/crypto/sha512/sha512.go
View File

@ -150,18 +150,23 @@ func (d0 *digest) Sum(in []byte) []byte {
}
h := d.h[:]
size := Size
if d.is384 {
h = d.h[:6]
size = Size384
}
for _, s := range h {
in = append(in, byte(s>>56))
in = append(in, byte(s>>48))
in = append(in, byte(s>>40))
in = append(in, byte(s>>32))
in = append(in, byte(s>>24))
in = append(in, byte(s>>16))
in = append(in, byte(s>>8))
in = append(in, byte(s))
var digest [Size]byte
for i, s := range h {
digest[i*8] = byte(s >> 56)
digest[i*8+1] = byte(s >> 48)
digest[i*8+2] = byte(s >> 40)
digest[i*8+3] = byte(s >> 32)
digest[i*8+4] = byte(s >> 24)
digest[i*8+5] = byte(s >> 16)
digest[i*8+6] = byte(s >> 8)
digest[i*8+7] = byte(s)
}
return in
return append(in, digest[:size]...)
}

14
src/pkg/crypto/tls/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
src/pkg/crypto/tls/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
src/pkg/crypto/tls/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
src/pkg/crypto/tls/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)