Python RSA操作

公鑰加密、私鑰解密

# -*- coding: utf-8 -*-
import rsa

# rsa加密
def rsaEncrypt(str):
    # 生成公鑰、私鑰
    (pubkey, privkey) = rsa.newkeys(512)
    print("pub: ", pubkey)
    print("priv: ", privkey)
    # 明文編碼格式
    content = str.encode('utf-8')
    # 公鑰加密
    crypto = rsa.encrypt(content, pubkey)
    return (crypto, privkey)


# rsa解密
def rsaDecrypt(str, pk):
    # 私鑰解密
    content = rsa.decrypt(str, pk)
    con = content.decode('utf-8')
    return con


(a, b) = rsaEncrypt("hello")
print('加密后密文：')
print(a)
content = rsaDecrypt(a, b)
print('解密后明文：')
print(content)  

密鑰導出、簽名驗證

# -*- coding: utf-8 -*-
import rsa

# 先生成一對密鑰，然后保存.pem格式文件，當然也可以直接使用
(pubkey, privkey) = rsa.newkeys(1024)

pub = pubkey.save_pkcs1()
pubfile = open('public.pem', 'wb')
pubfile.write(pub)
pubfile.close()

pri = privkey.save_pkcs1()
prifile = open('private.pem', 'wb')
prifile.write(pri)
prifile.close()

# load公鑰和密鑰
message = 'lovesoo.org'
with open('public.pem', "rb") as publickfile:
    p = publickfile.read()
    pubkey = rsa.PublicKey.load_pkcs1(p)
    print(pubkey)
with open('private.pem', "rb") as privatefile:
    p = privatefile.read()
    privkey = rsa.PrivateKey.load_pkcs1(p)
    print(privkey)
# 用公鑰加密、再用私鑰解密
crypto = rsa.encrypt(message.encode('utf-8'), pubkey)
message = rsa.decrypt(crypto, privkey)
message = message.decode('utf-8')
print (message)

# sign 用私鑰簽名認證、再用公鑰驗證簽名
signature = rsa.sign(message.encode('utf-8'), privkey, 'SHA-1')
method_name = rsa.verify('lovesoo.org'.encode('utf-8'), signature, pubkey)
print(method_name)

對文件進行RSA加密解密

from rsa.bigfile import *
import rsa

with open('public.pem') as publickfile:
    p = publickfile.read()
    pubkey = rsa.PublicKey.load_pkcs1(p)

with open('private.pem') as privatefile:
    p = privatefile.read()
    privkey = rsa.PrivateKey.load_pkcs1(p)
with open('mysec.txt', 'rb') as infile, open('outputfile', 'wb') as outfile: #加密輸出
    encrypt_bigfile(infile, outfile, pubkey)

with open('outputfile', 'rb') as infile2, open('result', 'wb') as outfile2:  #解密輸出
    decrypt_bigfile(infile2, outfile2, privkey)

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4.0的主要變化
版本3.4是3.x范圍內的最后一個版本。版本4.0刪除了以下模塊，因為它們不安全：

rsa._version133
rsa._version200
rsa.bigfile
rsa.varblock
這些模塊在3.4版中被標記為已棄用。

此外，在4.0中，I / O函數經過簡化，可以在所有支持的Python版本上使用字節。

4.0版本不再支持Python 2.6和3.3。