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// Copyright 2016 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 aes
import (
"crypto/cipher"
"crypto/internal/subtle"
)
// defined in asm_ppc64le.s
//go:noescape
func setEncryptKeyAsm(key *byte, keylen int, enc *uint32) int
//go:noescape
func setDecryptKeyAsm(key *byte, keylen int, dec *uint32) int
//go:noescape
func doEncryptKeyAsm(key *byte, keylen int, dec *uint32) int
//go:noescape
func encryptBlockAsm(dst, src *byte, enc *uint32)
//go:noescape
func decryptBlockAsm(dst, src *byte, dec *uint32)
type aesCipherAsm struct {
aesCipher
}
func newCipher(key []byte) (cipher.Block, error) {
n := 64 // size is fixed for all and round value is stored inside it too
c := aesCipherAsm{aesCipher{make([]uint32, n), make([]uint32, n)}}
k := len(key)
ret := 0
ret += setEncryptKeyAsm(&key[0], k*8, &c.enc[0])
ret += setDecryptKeyAsm(&key[0], k*8, &c.dec[0])
if ret > 0 {
return nil, KeySizeError(k)
}
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")
}
if subtle.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
panic("crypto/aes: invalid buffer overlap")
}
encryptBlockAsm(&dst[0], &src[0], &c.enc[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")
}
if subtle.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
panic("crypto/aes: invalid buffer overlap")
}
decryptBlockAsm(&dst[0], &src[0], &c.dec[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) {
setEncryptKeyAsm(&key[0], len(key)*8, &enc[0])
setDecryptKeyAsm(&key[0], len(key)*8, &dec[0])
}
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