python实现非对称加密算法_Python3非对称加密算法RSA实例详解

本文实例讲述了Python3非对称加密算法RSA。分享给大家供大家参考,具体如下:

python3 可以使用 Crypto.PublicKey.RSA 和 rsa 生成公钥、私钥。

其中 python3.6 Crypto 库的安装方式请参考前面一篇《Python3对称加密算法AES、DES3》

rsa 加解密的库使用 pip3 install rsa 就行了

C:\WINDOWS\system32>pip3 install rsa

Collecting rsa

Downloading https://files.pythonhosted.org/packages/e1/ae/baedc9cb175552e95f3395c43055a6a5e125ae4d48a1d7a924baca83e92e/rsa-3.4.2-py2.py3-none-any.whl (46kB)

100% |████████████████████████████████| 51kB 99kB/s

Collecting pyasn1>=0.1.3 (from rsa)

Downloading https://files.pythonhosted.org/packages/a0/70/2c27740f08e477499ce19eefe05dbcae6f19fdc49e9e82ce4768be0643b9/pyasn1-0.4.3-py2.py3-none-any.whl (72kB)

100% |████████████████████████████████| 81kB 289kB/s

Installing collected packages: pyasn1, rsa

Successfully installed pyasn1-0.4.3 rsa-3.4.2

使用 Crypto.PublicKey.RSA 生成公钥、私钥:

import Crypto.PublicKey.RSA

import Crypto.Random

x = Crypto.PublicKey.RSA.generate(2048)

a = x.exportKey("PEM") # 生成私钥

b = x.publickey().exportKey() # 生成公钥

with open("a.pem", "wb") as x:

x.write(a)

with open("b.pem", "wb") as x:

x.write(b)

y = Crypto.PublicKey.RSA.generate(2048, Crypto.Random.new().read) # 使用 Crypto.Random.new().read 伪随机数生成器

c = y.exportKey() # 生成私钥

d = y.publickey().exportKey() #生成公钥

with open("c.pem", "wb") as x:

x.write(c)

with open("d.pem", "wb") as x:

x.write(d)

使用 Crypto.PublicKey.RSA.importKey(private_key) 生成公钥和证书:

import Crypto.PublicKey.RSA

with open("a.pem", "rb") as x:

xx = Crypto.PublicKey.RSA.importKey(x.read())

b = xx.publickey().exportKey() # 生成公钥

with open("b.pem", "wb") as x:

x.write(b)

a = xx.exportKey("DER") # 生成 DER 格式的证书

with open("a.der", "wb") as x:

x.write(a)

使用 rsa 生成公钥、私钥:

import rsa

f, e = rsa.newkeys(2048) # 生成公钥、私钥

e = e.save_pkcs1() # 保存为 .pem 格式

with open("e.pem", "wb") as x: # 保存私钥

x.write(e)

f = f.save_pkcs1() # 保存为 .pem 格式

with open("f.pem", "wb") as x: # 保存公钥

x.write(f)

RSA非对称加密算法实现:

使用Crypto模块:

import Crypto.PublicKey.RSA

import Crypto.Cipher.PKCS1_v1_5

import Crypto.Random

import Crypto.Signature.PKCS1_v1_5

import Crypto.Hash

y = b"abcdefg1234567"

with open("b.pem", "rb") as x:

b = x.read()

cipher_public = Crypto.Cipher.PKCS1_v1_5.new(Crypto.PublicKey.RSA.importKey(b))

cipher_text = cipher_public.encrypt(y) # 使用公钥进行加密

with open("a.pem", "rb") as x:

a = x.read()

cipher_private = Crypto.Cipher.PKCS1_v1_5.new(Crypto.PublicKey.RSA.importKey(a))

text = cipher_private.decrypt(cipher_text, Crypto.Random.new().read) # 使用私钥进行解密

assert text == y # 断言验证

with open("c.pem", "rb") as x:

c = x.read()

c_rsa = Crypto.PublicKey.RSA.importKey(c)

signer = Crypto.Signature.PKCS1_v1_5.new(c_rsa)

msg_hash = Crypto.Hash.SHA256.new()

msg_hash.update(y)

sign = signer.sign(msg_hash) # 使用私钥进行'sha256'签名

with open("d.pem", "rb") as x:

d = x.read()

d_rsa = Crypto.PublicKey.RSA.importKey(d)

verifer = Crypto.Signature.PKCS1_v1_5.new(d_rsa)

msg_hash = Crypto.Hash.SHA256.new()

msg_hash.update(y)

verify = verifer.verify(msg_hash, sign) # 使用公钥验证签名

print(verify)

运行结果:

True

使用 rsa 模块:

import rsa

y = b"abcdefg1234567"

with open("e.pem", "rb") as x:

e = x.read()

e = rsa.PrivateKey.load_pkcs1(e) # load 私钥

with open("f.pem", "rb") as x:

f = x.read()

f = rsa.PublicKey.load_pkcs1(f) # load 公钥,由于之前生成的私钥缺少'RSA'字段,故无法 load

cipher_text = rsa.encrypt(y, f) # 使用公钥加密

text = rsa.decrypt(cipher_text, e) # 使用私钥解密

assert text == y # 断言验证

sign = rsa.sign(y, e, "SHA-256") # 使用私钥进行'sha256'签名

verify = rsa.verify(y, sign, f) # 使用公钥验证签名

print(verify)

运行结果:

True

PS:关于加密解密感兴趣的朋友还可以参考本站在线工具:

在线MD5/hash/SHA-1/SHA-2/SHA-256/SHA-512/SHA-3/RIPEMD-160加密工具:http://tools.zyiz.net/password/hash_md5_sha

希望本文所述对大家Python程序设计有所帮助。

你可能感兴趣的:(python实现非对称加密算法)