crypto用python加密cryptoJS解密

问题：如何将后台python加密的密文使用cryptoJS解密？crypto-js解密报错malformed utf-8 data

解决：注意python端Crypto模块和前端crypto-js的配合使用

方法：

python代码：

def pad(data):
    length = 16 - (len(data) % 16)
    return data + chr(length)*length

def unpad(data):
    return data[:-ord(data[-1])]

def encrypt(message, passphrase):
    IV = Random.new().read(BLOCK_SIZE)
    aes = AES.new(passphrase, AES.MODE_CFB, IV, segment_size=128)
    return base64.b64encode(IV + aes.encrypt(pad(message)))

def decrypt(encrypted, passphrase):
    encrypted = base64.b64decode(encrypted)
    IV = encrypted[:BLOCK_SIZE]
    aes = AES.new(passphrase, AES.MODE_CFB, IV, segment_size=128)
    return unpad(aes.decrypt(encrypted[BLOCK_SIZE:]))

前端代码：

<script src="https://cdn.rawgit.com/CryptoStore/crypto-js/3.1.2/build/rollups/aes.js"></script>
<script src="https://cdn.rawgit.com/CryptoStore/crypto-js/3.1.2/build/components/mode-cfb-min.js"></script>
<script>
    var base64ciphertextFromPython = "...";
    var ciphertext = CryptoJS.enc.Base64.parse(base64ciphertextFromPython);

    // split iv and ciphertext
    var iv = ciphertext.clone();
    iv.sigBytes = 16;
    iv.clamp();
    ciphertext.words.splice(0, 4); // delete 4 words = 16 bytes
    ciphertext.sigBytes -= 16;

    var key = CryptoJS.enc.Utf8.parse("1234567890123456");

    // decryption
    var decrypted = CryptoJS.AES.decrypt({ciphertext: ciphertext}, key, {
      iv: iv,
      mode: CryptoJS.mode.CFB
    });
    console.log ( decrypted.toString(CryptoJS.enc.Utf8));
</script>

参考：

https://codeday.me/bug/20191008/1875367.html