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aes-256-cbc encryption and decryption interoperability (php/golang)
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| <?php | |
| class CryptHelper | |
| { | |
| const CIPHER_ALGO = 'AES-256-CBC'; | |
| /** | |
| * 加密 | |
| * @param $plaintext | |
| * @param $password | |
| * @return string | |
| */ | |
| public static function encrypt($plaintext, $password) | |
| { | |
| $method = self::CIPHER_ALGO; | |
| $key = md5($password); | |
| $iv = substr($key, 0, 16); | |
| // OPENSSL_RAW_DATA = 1 | |
| $ciphertext = openssl_encrypt($plaintext, $method, $key, 1, $iv); | |
| return bin2hex($ciphertext); | |
| } | |
| /** | |
| * @param $hexData | |
| * @param $password | |
| * @return false|string | |
| */ | |
| public static function decrypt($hexData, $password) | |
| { | |
| $method = self::CIPHER_ALGO; | |
| // 兼容php5.3 | |
| $data = pack('H*', $hexData); | |
| // $data = hex2bin($hexData); | |
| $key = md5($password); | |
| $iv = substr($key, 0, 16); | |
| return openssl_decrypt($data, $method, $key, 1, $iv); | |
| } | |
| } |
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| package xcrypt | |
| import ( | |
| "bytes" | |
| "crypto/aes" | |
| "crypto/cipher" | |
| "crypto/md5" | |
| "encoding/hex" | |
| "errors" | |
| ) | |
| func Encrypt(plaintext string, password string) (string, error) { | |
| pass := md5V(password) | |
| keyBytes := []byte(pass) | |
| key := keyBytes[:] | |
| iv := key[:16] | |
| block, err := aes.NewCipher(key) | |
| if err != nil { | |
| return "", err | |
| } | |
| paddedPlaintext := pkcs5Padding([]byte(plaintext), block.BlockSize()) | |
| mode := cipher.NewCBCEncrypter(block, iv) | |
| ciphertext := make([]byte, len(paddedPlaintext)) | |
| mode.CryptBlocks(ciphertext, paddedPlaintext) | |
| return hex.EncodeToString(ciphertext), nil | |
| } | |
| func Decrypt(hexData string, password string) (string, error) { | |
| data, err := hex.DecodeString(hexData) | |
| if err != nil { | |
| return "", err | |
| } | |
| pass := md5V(password) | |
| keyBytes := []byte(pass) | |
| key := keyBytes[:] | |
| iv := key[:16] | |
| block, err := aes.NewCipher(key) | |
| if err != nil { | |
| return "", err | |
| } | |
| if len(data) < aes.BlockSize { | |
| return "", errors.New("ciphertext too short") | |
| } | |
| mode := cipher.NewCBCDecrypter(block, iv) | |
| mode.CryptBlocks(data, data) | |
| return string(pkcs5UnPadding(data)), nil | |
| } | |
| func pkcs5UnPadding(data []byte) []byte { | |
| length := len(data) | |
| unpadding := int(data[length-1]) | |
| return data[:(length - unpadding)] | |
| } | |
| func md5V(str string) string { | |
| h := md5.New() | |
| h.Write([]byte(str)) | |
| return hex.EncodeToString(h.Sum(nil)) | |
| } | |
| func pkcs5Padding(cipherText []byte, blockSize int) []byte { | |
| padding := blockSize - len(cipherText)%blockSize | |
| padText := bytes.Repeat([]byte{byte(padding)}, padding) | |
| return append(cipherText, padText...) | |
| } |
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