python国密sm2

Python中可以使用第三方库pycryptodome来实现SM2算法。以下是一个简单的示例代码：

from Crypto.PublicKey import ECC
from Crypto.Cipher import AES, PKCS1_OAEP
from Crypto.Hash import SHA256
from Crypto.Signature import DSS
from Crypto.Util.Padding import pad, unpad
from base64 import b64encode, b64decode

# 生成SM2密钥对
key = ECC.generate(curve='sm2')
priv_key = key.export_key(format='DER')
pub_key = key.public_key().export_key(format='DER')

# SM2加密
aes_key = b'ThisIsASecretKey'
plaintext = b'This is a secret message.'
cipher = SM2Cipher(pub_key)
ciphertext, iv = cipher.encrypt(aes_key, plaintext)

# SM2解密
cipher = SM2Cipher(priv_key)
decrypted_aes_key = cipher.decrypt(ciphertext, iv)
plaintext = AES.new(decrypted_aes_key, AES.MODE_CBC, iv).decrypt(ciphertext)

# SM2签名
h = SHA256.new(b'This is a message to be signed.')
signer = DSS.new(key, 'fips-186-3')
signature = signer.sign(h)

# SM2验签
verifier = DSS.new(key.public_key(), 'fips-186-3')
try:
    verifier.verify(h, signature)
    print("Signature is valid.")
except ValueError:
    print("Signature is invalid.")

需要注意的是，这里的SM2Cipher是自定义的一个加解密类。你可以在自己的代码中按照需要来实现该类。