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golang aes ecb pKCS5Padding like java 3DES_ECB_PKCS5Padding
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package idcardocr | |
import ( | |
"bytes" | |
"crypto/cipher" | |
"crypto/des" | |
) | |
// 3DES加密 | |
func ECB3DesEncrypt(content, key []byte) ([]byte, error) { | |
block, err := des.NewTripleDESCipher(key) | |
if err != nil { | |
return nil, err | |
} | |
ecb := NewECBEncrypter(block) | |
content = pKCS5Padding(content, block.BlockSize()) | |
crypted := make([]byte, len(content)) | |
ecb.CryptBlocks(crypted, content) | |
return crypted, nil | |
} | |
// 3DES解密 | |
func ECB3DesDecrypt(crypted, key []byte) ([]byte, error) { | |
block, err := des.NewTripleDESCipher(key) | |
if err != nil { | |
return nil, err | |
} | |
blockMode := NewECBDecrypter(block) | |
origData := make([]byte, len([]byte(crypted))) | |
blockMode.CryptBlocks(origData, []byte(crypted)) | |
origData = pKCS5UnPadding(origData) | |
return origData, nil | |
} | |
func pKCS5Padding(ciphertext []byte, blockSize int) []byte { | |
padding := blockSize - len(ciphertext)%blockSize | |
padtext := bytes.Repeat([]byte{byte(padding)}, padding) | |
return append(ciphertext, padtext...) | |
} | |
func pKCS5UnPadding(origData []byte) []byte { | |
length := len(origData) | |
// 去掉最后一个字节 unpadding 次 | |
unpadding := int(origData[length-1]) | |
return origData[:(length - unpadding)] | |
} | |
type ecb struct { | |
b cipher.Block | |
blockSize int | |
} | |
func newECB(b cipher.Block) *ecb { | |
return &ecb{ | |
b: b, | |
blockSize: b.BlockSize(), | |
} | |
} | |
// 引入golang官方 https://codereview.appspot.com/7860047/ | |
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:] | |
} | |
} | |
// end |
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