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pysm4

SM4算法

国密SM4(无线局域网SMS4)算法, 一个分组算法, 分组长度为128bit, 密钥长度为128bit, 算法具体内容参照SM4算法

pysm4

pysm4是国密SM4算法的Python实现, 提供了encryptdecryptencrypt_ecbdecrypt_ecbencrypt_cbcdecrypt_cbc等函数用于加密解密, 用法如下:

1. encryptdecrypt

>>> from pysm4 import encrypt, decrypt
# 明文
>>> clear_num = 0x0123456789abcdeffedcba9876543210
# 密钥
>>> mk = 0x0123456789abcdeffedcba9876543210
# 加密
>>> cipher_num = encrypt(clear_num, mk)
>>> hex(cipher_num)[2:].replace('L', '')
'681edf34d206965e86b3e94f536e4246'
# 解密
>>> clear_num == decrypt(cipher_num, mk)
True

2. encrypt_ecbdecrypt_ecb

>>> from pysm4 import encrypt_ecb, decrypt_ecb
# 明文
>>> plain_text = 'pysm4是国密SM4算法的Python实现'
# 密钥
>>> key = 'hello, world!'  # 密钥长度小于等于16字节
# 加密
>>> cipher_text = encrypt_ecb(plain_text, key)
>>> cipher_text
'ng3L4ldgvsZciAgx3LhplDvIzrd0+GXiNqNmd1VW0YOlwo+ojtpownOCbnxbq/3y'
# 解密
>>> plain_text == decrypt_ecb(cipher_text, key)
True

3. encrypt_cbcdecrypt_cbc

>>> from pysm4 import encrypt_cbc, decrypt_cbc
# 明文
>>> plain_text = 'pysm4是国密SM4算法的Python实现'
# 密钥
>>> key = 'hello, world!'  # 密钥 长度小于等于16字节
# 初始化向量
>>> iv = '11111111'        # 初始化向量  长度小于等于16字节
# 加密
>>> cipher_text = encrypt_cbc(plain_text, key, iv)
'cTsdKRSH2FqIJf22NHMjX5ZFHghR4ZtJ10wbNwj2//bJSElBXVeMtFycjdlVKP15'
# 解密
>>> plain_text == decrypt_cbc(cipher_text, key, iv)
True

pysm4实现了分组密码工作模式中的ECB(电子密码本)和CBC(密码块链接)模式, 具体内容请参考维基百科的分组密码工作模式

安装

$ python setup.py install

兼容

pysm4支持Python2.7和Python3.3以上版本,其他版本没有测试。

性能

验证SM4算法中的实例二:

实例二: 利用相同加密密钥对一组明文反复加密1000000次
明文: 01 23 45 67 89 ab cd ef fe dc ba 98 76 54 32 10
密钥: 01 23 45 67 89 ab cd ef fe dc ba 98 76 54 32 10 
密文: 59 52 98 c7 c6 fd 27 1f 04 02 f8 04 c3 3d 3f 66

使用pysm4在我个人电脑验证实例二时,耗时600多秒。性能比使用JAVA或C/C++实现版本差了很多。

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