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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/alias"
)
// Assert that aesCipherAsm implements the cbcEncAble and cbcDecAble interfaces.
var _ cbcEncAble = (*aesCipherAsm)(nil)
var _ cbcDecAble = (*aesCipherAsm)(nil)
type cbc struct {
b *aesCipherAsm
c code
iv [BlockSize]byte
}
func (b *aesCipherAsm) NewCBCEncrypter(iv []byte) cipher.BlockMode {
var c cbc
c.b = b
c.c = b.function
copy(c.iv[:], iv)
return &c
}
func (b *aesCipherAsm) NewCBCDecrypter(iv []byte) cipher.BlockMode {
var c cbc
c.b = b
c.c = b.function + 128 // decrypt function code is encrypt + 128
copy(c.iv[:], iv)
return &c
}
func (x *cbc) BlockSize() int { return BlockSize }
// cryptBlocksChain invokes the cipher message with chaining (KMC) instruction
// with the given function code. The length must be a multiple of BlockSize (16).
//
//go:noescape
func cryptBlocksChain(c code, iv, key, dst, src *byte, length int)
func (x *cbc) CryptBlocks(dst, src []byte) {
if len(src)%BlockSize != 0 {
panic("crypto/cipher: input not full blocks")
}
if len(dst) < len(src) {
panic("crypto/cipher: output smaller than input")
}
if alias.InexactOverlap(dst[:len(src)], src) {
panic("crypto/cipher: invalid buffer overlap")
}
if len(src) > 0 {
cryptBlocksChain(x.c, &x.iv[0], &x.b.key[0], &dst[0], &src[0], len(src))
}
}
func (x *cbc) SetIV(iv []byte) {
if len(iv) != BlockSize {
panic("cipher: incorrect length IV")
}
copy(x.iv[:], iv)
}
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