python 使用pycryptodom库编写SM4算法的Enc模式，Dec模式，Ecb模式加解密

好的，下面是使用pycryptodom库编写SM4算法的Enc模式，Dec模式，Ecb模式加解密的示例代码：

from Crypto.Cipher import SM4

# SM4加密函数，使用ECB模式
def sm4_encrypt_ecb(key, plaintext):
    cipher = SM4.new(key, SM4.MODE_ECB)
    ciphertext = cipher.encrypt(plaintext)
    return ciphertext.hex()

# SM4解密函数，使用ECB模式
def sm4_decrypt_ecb(key, ciphertext):
    cipher = SM4.new(key, SM4.MODE_ECB)
    plaintext = cipher.decrypt(bytes.fromhex(ciphertext))
    return plaintext.decode()

# SM4加密函数，使用CBC模式
def sm4_encrypt_cbc(key, iv, plaintext):
    cipher = SM4.new(key, SM4.MODE_CBC, iv)
    ciphertext = cipher.encrypt(plaintext)
    return ciphertext.hex()

# SM4解密函数，使用CBC模式
def sm4_decrypt_cbc(key, iv, ciphertext):
    cipher = SM4.new(key, SM4.MODE_CBC, iv)
    plaintext = cipher.decrypt(bytes.fromhex(ciphertext))
    return plaintext.decode()

# 测试代码
if __name__ == '__main__':
    # SM4密钥，长度为16字节
    key = b'0123456789abcdef'
    # 明文，长度必须是16的倍数
    plaintext = b'Hello, SM4!'
    # 初始化向量，长度为16字节
    iv = b'1234567890abcdef'

    # 测试ECB模式加解密
    ciphertext = sm4_encrypt_ecb(key, plaintext)
    print('SM4 ECB mode encrypted ciphertext:', ciphertext)
    decrypted_plaintext = sm4_decrypt_ecb(key, ciphertext)
    print('SM4 ECB mode decrypted plaintext:', decrypted_plaintext)

    # 测试CBC模式加解密
    ciphertext = sm4_encrypt_cbc(key, iv, plaintext)
    print('SM4 CBC mode encrypted ciphertext:', ciphertext)
    decrypted_plaintext = sm4_decrypt_cbc(key, iv, ciphertext)
    print('SM4 CBC mode decrypted plaintext:', decrypted_plaintext)

注：本示例代码仅供参考，请勿用于非法用途。