AES128 ECB
func EcbDecrypt(data, key []byte) []byte {
block, _ := aes.NewCipher(key)
decrypted := make([]byte, len(data))
size := block.BlockSize()
for bs, be := 0, size; bs < len(data); bs, be = bs+size, be+size {
block.Decrypt(decrypted[bs:be], data[bs:be])
}
return PKCS5UnPadding(decrypted)
}
func EcbEncrypt(data, key []byte) []byte {
block, _ := aes.NewCipher(key)
data = PKCS5Padding(data, block.BlockSize())
decrypted := make([]byte, len(data))
size := block.BlockSize()
for bs, be := 0, size; bs < len(data); bs, be = bs+size, be+size {
block.Encrypt(decrypted[bs:be], data[bs:be])
}
return decrypted
}
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)]
}
其他补码方式：
func PKCS7Padding(ciphertext []byte, blocksize int) []byte {
padding := blocksize - len(ciphertext)%blocksize
padtext := bytes.Repeat([]byte{byte(padding)}, padding)
return append(ciphertext, padtext...)
}
//去码
func PKCS7UnPadding(origData []byte) []byte {
length := len(origData)
unpadding := int(origData[length-1])
return origData[:(length - unpadding)]
}
func ZeroPadding(ciphertext []byte, blockSize int) []byte {
padding := blockSize - len(ciphertext)%blockSize
padtext := bytes.Repeat([]byte{0}, padding) //用0去填充
return append(ciphertext, padtext...)
}
func ZeroUnPadding(origData []byte) []byte {
return bytes.TrimFunc(origData,
func(r rune) bool {
return r == rune(0)
})
}
AES128 CBC
func AesEncryptCBC(origData []byte, key []byte,iv []byte) (encrypted []byte) {
// 分组秘钥
// NewCipher该函数限制了输入k的长度必须为16, 24或者32
block, _ := aes.NewCipher(key)
blockSize := block.BlockSize()
origData = ZeroPadding(origData, blockSize)
blockMode := cipher.NewCBCEncrypter(block, iv)
encrypted = make([]byte, len(origData))
blockMode.CryptBlocks(encrypted, origData)
return encrypted
}
func AesDecryptCBC(encrypted []byte, key []byte,iv []byte) (decrypted []byte) {
block, _ := aes.NewCipher(key)
//blockSize := block.BlockSize()
blockMode := cipher.NewCBCDecrypter(block, iv)
decrypted = make([]byte, len(encrypted))
blockMode.CryptBlocks(decrypted, encrypted)
decrypted = ZeroUnPadding(decrypted)
return decrypted
}
func ZeroPadding(ciphertext []byte, blockSize int) []byte {
padding := blockSize - len(ciphertext)%blockSize
padtext := bytes.Repeat([]byte{0}, padding) //用0去填充
return append(ciphertext, padtext...)
}
func ZeroUnPadding(origData []byte) []byte {
return bytes.TrimFunc(origData,
func(r rune) bool {
return r == rune(0)
})
}
