用python实现国密sm2的数字签名加密解密
时间: 2023-09-12 20:10:17 浏览: 114
实现SM2数字签名,加密和解密需要使用SM2算法库,可以使用Python的第三方库pycryptodome或gmssl。以下是使用pycryptodome实现SM2数字签名,加密和解密的示例代码:
1. SM2数字签名
```python
from Crypto.PublicKey import ECC
from Crypto.Signature import DSS
from Crypto.Hash import SHA256
from Crypto.Cipher import AES
from Crypto.Util.Padding import pad, unpad
from binascii import b2a_hex, a2b_hex
# 生成SM2密钥对
private_key = ECC.generate(curve='sm2')
public_key = private_key.public_key()
# 待签名数据
data = b'hello, world'
# 计算消息摘要
digest = SHA256.new(data)
# 对消息摘要进行数字签名
signer = DSS.new(private_key, 'fips-186-3')
signature = signer.sign(digest)
# 验证数字签名
verifier = DSS.new(public_key, 'fips-186-3')
try:
verifier.verify(digest, signature)
print("Signature is valid.")
except ValueError:
print("Signature is invalid.")
```
2. SM2加密和解密
```python
from Crypto.Cipher import SM2Cipher
from Crypto.PublicKey import ECC
from Crypto.Util.Padding import pad, unpad
from binascii import b2a_hex, a2b_hex
# 生成SM2密钥对
private_key = ECC.generate(curve='sm2')
public_key = private_key.public_key()
# 加密数据
plaintext = b'hello, world'
cipher = SM2Cipher.new(public_key)
ciphertext = cipher.encrypt(plaintext)
# 解密数据
cipher = SM2Cipher.new(private_key)
decrypttext = cipher.decrypt(ciphertext)
print("Plaintext:", plaintext)
print("Ciphertext:", b2a_hex(ciphertext))
print("Decrypttext:", decrypttext)
```
注意,以上代码只是示例,实际使用时需要注意安全性和数据格式转换等问题。