sm4不支持cbc模式么

you can try to code
# 电子密码本(ECB)
def encrypt_ecb(plain_text, key):
    """
    SM4(ECB)加密
    :param plain_text: 明文
    :param key: 密钥, 小于等于16字节
    """
    plain_text = _padding(plain_text, mode=SM4_ENCRYPT)
    if plain_text is None:
        return

    # 密钥检验
    key = _key_iv_check(key_iv=key)

    plain_hex = _hex(plain_text)
    cipher_hex_list = []
    for i in _range(len(plain_text) // BLOCK_BYTE):
        sub_hex = plain_hex[i * BLOCK_HEX:(i + 1) * BLOCK_HEX]
        cipher = encrypt(clear_num=int(sub_hex, 16),
                         mk=int(_hex(key), 16))
        cipher_hex_list.append(num2hex(num=cipher, width=BLOCK_HEX))

    cipher_text = b64encode(_unhex(''.join(cipher_hex_list)))
    return cipher_text if PY2 else cipher_text.decode(E_FMT)

def decrypt_ecb(cipher_text, key):
    """
    SM4(ECB)解密
    :param cipher_text: 密文
    :param key: 密钥, 小于等于16字节
    """
    cipher_text = b64decode(cipher_text)
    cipher_hex = _hex(cipher_text)

    # 密码检验
    key = _key_iv_check(key_iv=key)
    plain_hex_list = []
    for i in _range(len(cipher_text) // BLOCK_BYTE):
        sub_hex = cipher_hex[i * BLOCK_HEX:(i + 1) * BLOCK_HEX]
        plain = decrypt(cipher_num=int(sub_hex, 16),
                        mk=int(_hex(key), 16))
        plain_hex_list.append(num2hex(num=plain, width=BLOCK_HEX))

    plain_text = _padding(_unhex(''.join(plain_hex_list)),
                          mode=SM4_DECRYPT)
    return plain_text if PY2 else plain_text.decode(E_FMT)

# 密码块链接(CBC)
def encrypt_cbc(plain_text, key, iv):
    """
    SM4(CBC)加密
    :param plain_text: 明文
    :param key: 密钥, 小于等于16字节
    :param iv: 初始化向量, 小于等于16字节
    """
    plain_text = _padding(plain_text, mode=SM4_ENCRYPT)
    if plain_text is None:
        return

    # 密钥检验
    key = _key_iv_check(key_iv=key)
    # 初始化向量监测
    iv = _key_iv_check(key_iv=iv)

    plain_hex = _hex(plain_text)
    ivs = [int(_hex(iv), 16)]
    for i in _range(len(plain_text) // BLOCK_BYTE):
        sub_hex = plain_hex[i * BLOCK_HEX:(i + 1) * BLOCK_HEX]
        cipher = encrypt(clear_num=(int(sub_hex, 16) ^ ivs[i]),
                         mk=int(_hex(key), 16))
        ivs.append(cipher)

    cipher_text = b64encode(_unhex(''.join([num2hex(num=c, width=BLOCK_HEX)
                                            for c in ivs[1:]])))
    return cipher_text if PY2 else cipher_text.decode(E_FMT)

def decrypt_cbc(cipher_text, key, iv):
    """
    SM4(CBC)解密
    :param cipher_text: 密文
    :param key: 密钥 小于等于16字节
    :param iv: 初始化向量 小于等于16字节
    """
    cipher_text = b64decode(cipher_text)
    cipher_hex = _hex(cipher_text)

    # 密钥检测
    key = _key_iv_check(key_iv=key)
    # 初始化向量检测
    iv = _key_iv_check(key_iv=iv)
    ivs = [int(_hex(iv), 16)]
    plain_hex_list = []
    for i in _range(len(cipher_text) // BLOCK_BYTE):
        sub_hex = cipher_hex[i * BLOCK_HEX:(i + 1) * BLOCK_HEX]
        cipher = int(sub_hex, 16)
        plain = (ivs[i] ^ decrypt(cipher_num=cipher,
                                  mk=int(_hex(key), 16)))
        ivs.append(cipher)
        plain_hex_list.append(num2hex(num=plain, width=BLOCK_HEX))

    plain_text = _padding(_unhex(''.join(plain_hex_list)),
                          mode=SM4_DECRYPT)
    return plain_text if PY2 else plain_text.decode(E_FMT)
wechat-miniprogram / sm-crypto

sm4不支持cbc模式么 #8
