sm2加解密 python

好的，关于sm2加解密，你可以使用Python的cryptography库来实现。具体步骤如下：

1. 安装cryptography库：在命令行中输入`pip install cryptography`即可安装。

2. 生成密钥对：使用cryptography库中的`generate_key_pair()`函数生成密钥对。示例代码如下：

   from cryptography.hazmat.primitives.asymmetric import ec
   from cryptography.hazmat.primitives.asymmetric import utils
   from cryptography.hazmat.primitives.serialization import Encoding
   from cryptography.hazmat.primitives.serialization import PrivateFormat
   from cryptography.hazmat.primitives.serialization import PublicFormat

   private_key = ec.generate_private_key(ec.SECP256R1())
   public_key = private_key.public_key()

   # 将私钥和公钥分别保存到文件中
   with open('private_key.pem', 'wb') as f:
       f.write(private_key.private_bytes(Encoding.PEM, PrivateFormat.PKCS8, utils.NoEncryption()))
   with open('public_key.pem', 'wb') as f:
       f.write(public_key.public_bytes(Encoding.PEM, PublicFormat.SubjectPublicKeyInfo))

3. 加密数据：使用cryptography库中的`SM2.encrypt()`函数加密数据。示例代码如下：

   from cryptography.hazmat.primitives.asymmetric import ec
   from cryptography.hazmat.primitives.asymmetric import utils
   from cryptography.hazmat.primitives.serialization import Encoding
   from cryptography.hazmat.primitives.serialization import PublicFormat
   from cryptography.hazmat.primitives.asymmetric import padding

   # 读取公钥
   with open('public_key.pem', 'rb') as f:
       public_key = ec.EllipticCurvePublicKey.from_encoded_point(ec.SECP256R1(), f.read())

   # 加密数据
   plaintext = b'Hello, world!'
   ciphertext = public_key.encrypt(plaintext, padding.OAEP(padding.MGF1(algorithm=utils.Prehashed(ec.ECDSA(utils.PrehashedSHA256()))), algorithm=utils.Prehashed(ec.ECDSA(utils.PrehashedSHA256()))))

4. 解密数据：使用cryptography库中的`SM2.decrypt()`函数解密数据。示例代码如下：

   from cryptography.hazmat.primitives.asymmetric import ec
   from cryptography.hazmat.primitives.asymmetric import utils
   from cryptography.hazmat.primitives.serialization import Encoding
   from cryptography.hazmat.primitives.serialization import PrivateFormat
   from cryptography.hazmat.primitives.asymmetric import padding

   # 读取私钥
   with open('private_key.pem', 'rb') as f:
       private_key = ec.EllipticCurvePrivateKey.from_private_bytes(f.read())

   # 解密数据
   plaintext = private_key.decrypt(ciphertext, padding.OAEP(padding.MGF1(algorithm=utils.Prehashed(ec.ECDSA(utils.PrehashedSHA256()))), algorithm=utils.Prehashed(ec.ECDSA(utils.PrehashedSHA256()))))
   print(plaintext)