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HomeBackend DevelopmentPython Tutorialpython实现RSA加密(解密)算法

RSA是目前最有影响力的公钥加密算法,它能够抵抗到目前为止已知的绝大多数密码攻击,已被ISO推荐为公钥数据加密标准。

今天只有短的RSA钥匙才可能被强力方式解破。到2008年为止,世界上还没有任何可靠的攻击RSA算法的方式。只要其密钥的长度足够长,用RSA加密的信息实际上是不能被解破的。但在分布式计算和量子计算机理论日趋成熟的今天,RSA加密安全性受到了挑战。

RSA算法基于一个十分简单的数论事实:将两个大素数相乘十分容易,但是想要对其乘积进行因式分解却极其困难,因此可以将乘积公开作为加密密钥。

核心代码:

# -*- encoding:gbk -*- import math,random#导入模块 def prime_num(max_num):#生成小于max_num的素数列表 prime_num=[] for i in xrange(2,max_num): temp=0 sqrt_max_num=int(math.sqrt(i))+1 for j in xrange(2,sqrt_max_num): if i%j==0: temp=j break if temp==0: prime_num.append(i) return prime_num def rsa_key():#生成密钥的函数 prime=prime_num(400)#小于400的素数列表 p=random.choice(prime[-50:-1])#从后50个素数中随机选择一个作为p q=random.choice(prime[-50:-1])#从后50个素数中随机选择一个作为q while(p==q):#如果p和q相等则重新选择 q=random.choice(prime[-50:-1]) N=p*q r=(p-1)*(q-1) r_prime=prime_num(r) e=random.choice(r_prime)#随机选一个素数 d=0 for n in xrange(2,r): if (e*n)%r==1: d=n break return ((N,e),(N,d)) def encrypt(pub_key,origal):#生成加密用的公钥 N,e=pub_key return (origal**e)%N def decrypt(pri_key,encry):#生成解密用的私钥 N,d=pri_key return (encry**d)%N

下面一段代码给大家介绍python_rsa加密解密

使用python进行rsa加密与加密,包括公钥加密私钥解密,私钥加密公钥解密。(需要安装M2Crypto库)。

代码:

#!/usr/bin/env python
#encoding=utf-8 
'''
测试rsa加密解密
'''
from M2Crypto import RSA 
msg = 'aaaa-aaaa'
rsa_pub = RSA.load_pub_key('rsa_pub.pem')
rsa_pri = RSA.load_key('rsa_pri.pem')
print '*************************************************************'
print '公钥加密,私钥解密'
ctxt = rsa_pub.public_encrypt(msg, RSA.pkcs1_padding)
ctxt64 = ctxt.encode('base64')
print ('密文:%s'% ctxt64)
rsa_pri = RSA.load_key('rsa_pri.pem')
txt = rsa_pri.private_decrypt(ctxt, RSA.pkcs1_padding)
print('明文:%s'% txt)
print '*************************************************************'
print '私钥加密,公钥解密'
ctxt_pri = rsa_pri.private_encrypt(msg, RSA.pkcs1_padding)
ctxt64_pri = ctxt.encode('base64')
print ('密文:%s'% ctxt64_pri)
txt_pri = rsa_pub.public_decrypt(ctxt_pri, RSA.pkcs1_padding)
print('明文:%s'% txt_pri)

库的安装说明

M2Crypto库的下载地址:

https://github.com/martinpaljak/M2Crypto

或者:https://pypi.python.org/pypi/M2Crypto

依赖的库:openssh-devel gcc swig (这3个库在centos上可以直接使用yum安装)

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