RSA算法的python实现-创新互联
小编给大家分享一下RSA算法的python实现,相信大部分人都还不怎么了解,因此分享这篇文章给大家参考一下,希望大家阅读完这篇文章后大有收获,下面让我们一起去了解一下吧!
为大关等地区用户提供了全套网页设计制作服务,及大关网站建设行业解决方案。主营业务为成都网站设计、成都做网站、大关网站设计,以传统方式定制建设网站,并提供域名空间备案等一条龙服务,秉承以专业、用心的态度为用户提供真诚的服务。我们深信只要达到每一位用户的要求,就会得到认可,从而选择与我们长期合作。这样,我们也可以走得更远!## {{{ http://code.activestate.com/recipes/572196/ (r2) #!/usr/bin/python # -*- coding: utf-8 -*- """\ The author takes no responsibility for anything having anything to do with this code. Use at your own risk, or don't use at all. This is a Python implementation functions used in the RSA algorithm, as well as a file-like object for writing encrypted files that it can later read using the same password. This is useful for if you want store sensitive data to a file with a user-given password. The RSA keys are obtained as follows: 1. Choose two prime numbers p and q 2. Compute n=pq 3. Compute φ(n)=totient(p,q) 4. Choose e coprime to φ(n) such that gcd(e,n)=1 5. Compute d=modInverse(e,φ(n)) 6. e is the publickey; n is also made public; d is the privatekey Encryption is as follows: 1. Size of data to be encrypted must be less than n 2. ciphertext=pow(plaintext,publickey,n) Decryption is as follows: 1. Size of data to be encrypted must be less than n 2. plaintext=pow(ciphertext,privatekey,n) """ import random,md5 def RabinMillerWitness(test,possible): #calculates (a**b)%n via binary exponentiation, yielding itermediate #results as Rabin-Miller requires #written by Josiah Carlson #modified and optimized by Collin Stocks a,b,n=long(test%possible),possible-1,possible if a==1: return False A=a t=1L while t<=b: t<<=1 #t=2**k, and t>b t>>=2 while t: A=pow(A,2,n) if t&b: A=(A*a)%n if A==1: return False t>>=1 return True smallprimes = (3,5,7,11,13,17,19,23,29,31,37,41,43, 47,53,59,61,67,71,73,79,83,89,97) def getPrime(b,seed): #Generates an integer of b bits that is probably prime #written by Josiah Carlson #modified (heavily) and optimized by Collin Stocks bits=int(b) assert 64<=bits k=bits<<1 possible=seed|1 # make it odd good=0 while not good: possible+=2 # keep it odd good=1 for i in smallprimes: if possible%i==0: good=0 break else: for i in xrange(k): test=random.randrange(2,possible)|1 if RabinMillerWitness(test,possible): good=0 break return possible def egcd(a,b): # Extended Euclidean Algorithm # returns x, y, gcd(a,b) such that ax + by = gcd(a,b) u, u1 = 1, 0 v, v1 = 0, 1 while b: q = a // b u, u1 = u1, u - q * u1 v, v1 = v1, v - q * v1 a, b = b, a - q * b return u, v, a def gcd(a,b): # 2.8 times faster than egcd(a,b)[2] a,b=(b,a) if a以上是“RSA算法的python实现”这篇文章的所有内容,感谢各位的阅读!相信大家都有了一定的了解,希望分享的内容对大家有所帮助,如果还想学习更多知识,欢迎关注创新互联行业资讯频道!
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