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ecb.go
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ecb.go
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// Copyright 2016 Andre Burgaud. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Electronic Code Book (ECB) mode.
// Implemented for legacy purpose only. ECB should be avoided
// as a mode of operation. Favor other modes available
// in the Go crypto/cipher package (i.e. CBC, GCM, CFB, OFB or CTR).
// See NIST SP 800-38A, pp 9
// The source code in this file is a modified copy of
// https://golang.org/src/crypto/cipher/cbc.go
// and released under the following
// Go Authors copyright and license:
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found at https://golang.org/LICENSE
// Package ecb implements block cipher mode of encryption ECB (Electronic Code
// Book) functions. This is implemented for legacy purposes only and should not
// be used for any new encryption needs. Use CBC (Cipher Block Chaining) instead.
package ecb
import (
"crypto/cipher"
)
type ecb struct {
b cipher.Block
blockSize int
tmp []byte
}
func newECB(b cipher.Block) *ecb {
return &ecb{
b: b,
blockSize: b.BlockSize(),
tmp: make([]byte, b.BlockSize()),
}
}
type ecbEncrypter ecb
// NewECBEncrypter returns a BlockMode which encrypts in elecronic codebook (ECB)
// mode, using the given Block (Cipher).
func NewECBEncrypter(b cipher.Block) cipher.BlockMode {
return (*ecbEncrypter)(newECB(b))
}
func (x *ecbEncrypter) BlockSize() int { return x.blockSize }
func (x *ecbEncrypter) CryptBlocks(dst, src []byte) {
if len(src)%x.blockSize != 0 {
panic("crypto/cipher: input not full blocks")
}
if len(dst) < len(src) {
panic("crypto/cipher: output smaller than input")
}
for len(src) > 0 {
x.b.Encrypt(dst[:x.blockSize], src[:x.blockSize])
src = src[x.blockSize:]
dst = dst[x.blockSize:]
}
}
type ecbDecrypter ecb
// NewECBDecrypter returns a BlockMode which decrypts in electronic codebook (ECB)
// mode, using the given Block.
func NewECBDecrypter(b cipher.Block) cipher.BlockMode {
return (*ecbDecrypter)(newECB(b))
}
func (x *ecbDecrypter) BlockSize() int { return x.blockSize }
func (x *ecbDecrypter) CryptBlocks(dst, src []byte) {
if len(src)%x.blockSize != 0 {
panic("crypto/cipher: input not full blocks")
}
if len(dst) < len(src) {
panic("crypto/cipher: output smaller than input")
}
if len(src) == 0 {
return
}
for len(src) > 0 {
x.b.Decrypt(dst[:x.blockSize], src[:x.blockSize])
src = src[x.blockSize:]
dst = dst[x.blockSize:]
}
}