80 lines
1.9 KiB
Go
80 lines
1.9 KiB
Go
|
// Copyright 2012 The Go Authors. All rights reserved.
|
||
|
|
// Use of this source code is governed by a BSD-style
|
||
|
|
// license that can be found in the LICENSE file.
|
||
|
|
|
||
|
|
package aes12
|
||
|
|
|
||
|
|
// defined in asm_amd64.s
|
||
|
|
func hasAsm() bool
|
||
|
|
func encryptBlockAsm(nr int, xk *uint32, dst, src *byte)
|
||
|
|
func decryptBlockAsm(nr int, xk *uint32, dst, src *byte)
|
||
|
|
func expandKeyAsm(nr int, key *byte, enc *uint32, dec *uint32)
|
||
|
|
|
||
|
|
type aesCipherAsm struct {
|
||
|
|
aesCipher
|
||
|
|
}
|
||
|
|
|
||
|
|
var useAsm = hasAsm()
|
||
|
|
|
||
|
|
func newCipher(key []byte) (Block, error) {
|
||
|
|
if !useAsm {
|
||
|
|
return newCipherGeneric(key)
|
||
|
|
}
|
||
|
|
n := len(key) + 28
|
||
|
|
c := aesCipherAsm{aesCipher{make([]uint32, n), make([]uint32, n)}}
|
||
|
|
rounds := 10
|
||
|
|
switch len(key) {
|
||
|
|
case 128 / 8:
|
||
|
|
rounds = 10
|
||
|
|
case 192 / 8:
|
||
|
|
rounds = 12
|
||
|
|
case 256 / 8:
|
||
|
|
rounds = 14
|
||
|
|
}
|
||
|
|
expandKeyAsm(rounds, &key[0], &c.enc[0], &c.dec[0])
|
||
|
|
if hasGCMAsm() {
|
||
|
|
return &aesCipherGCM{c}, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
return &c, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *aesCipherAsm) BlockSize() int { return BlockSize }
|
||
|
|
|
||
|
|
func (c *aesCipherAsm) Encrypt(dst, src []byte) {
|
||
|
|
if len(src) < BlockSize {
|
||
|
|
panic("crypto/aes: input not full block")
|
||
|
|
}
|
||
|
|
if len(dst) < BlockSize {
|
||
|
|
panic("crypto/aes: output not full block")
|
||
|
|
}
|
||
|
|
encryptBlockAsm(len(c.enc)/4-1, &c.enc[0], &dst[0], &src[0])
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *aesCipherAsm) Decrypt(dst, src []byte) {
|
||
|
|
if len(src) < BlockSize {
|
||
|
|
panic("crypto/aes: input not full block")
|
||
|
|
}
|
||
|
|
if len(dst) < BlockSize {
|
||
|
|
panic("crypto/aes: output not full block")
|
||
|
|
}
|
||
|
|
decryptBlockAsm(len(c.dec)/4-1, &c.dec[0], &dst[0], &src[0])
|
||
|
|
}
|
||
|
|
|
||
|
|
// expandKey is used by BenchmarkExpand to ensure that the asm implementation
|
||
|
|
// of key expansion is used for the benchmark when it is available.
|
||
|
|
func expandKey(key []byte, enc, dec []uint32) {
|
||
|
|
if useAsm {
|
||
|
|
rounds := 10 // rounds needed for AES128
|
||
|
|
switch len(key) {
|
||
|
|
case 192 / 8:
|
||
|
|
rounds = 12
|
||
|
|
case 256 / 8:
|
||
|
|
rounds = 14
|
||
|
|
}
|
||
|
|
expandKeyAsm(rounds, &key[0], &enc[0], &dec[0])
|
||
|
|
} else {
|
||
|
|
expandKeyGo(key, enc, dec)
|
||
|
|
}
|
||
|
|
}
|