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ecb.go
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ecb.go
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// Copyright 2013 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.
// Electronic Code Book (ECB) mode.
// ECB provides confidentiality by assigning a fixed ciphertext block to each
// plaintext block.
// See NIST SP 800-38A, pp 08-09
package aescrypto
import (
"crypto/aes"
"crypto/cipher"
"errors"
)
type ecb struct {
b cipher.Block
blockSize int
}
func newECB(b cipher.Block) *ecb {
return &ecb{
b: b,
blockSize: b.BlockSize(),
}
}
type ecbEncrypter ecb
// NewECBEncrypter returns a BlockMode which encrypts in electronic code book
// mode, using the given Block.
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, src[:x.blockSize])
src = src[x.blockSize:]
dst = dst[x.blockSize:]
}
}
type ecbDecrypter ecb
// NewECBDecrypter returns a BlockMode which decrypts in electronic code book
// 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")
}
for len(src) > 0 {
x.b.Decrypt(dst, src[:x.blockSize])
src = src[x.blockSize:]
dst = dst[x.blockSize:]
}
}
// aes、ecb、pkcs5 加密
func AesEcbPkcs5Encrypt(src, key []byte) ([]byte, error) {
if len(src) == 0 {
return nil, errors.New("plain content empty")
}
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
ecb := NewECBEncrypter(block)
content := PKCS5Padding(src, block.BlockSize())
crypted := make([]byte, len(content))
ecb.CryptBlocks(crypted, content)
return crypted, nil
}
// aes、ecb、pkcs5 解密
func AesEcbPkcs5Decrypt(crypted, key []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
blockMode := NewECBDecrypter(block)
origData := make([]byte, len(crypted))
blockMode.CryptBlocks(origData, crypted)
origData,err = PKCS5UnPadding(origData)
if err != nil {
return nil, err
}
return origData, nil
}