python rsa模块【sign 加签验签】的使用

https://www.cnblogs.com/kayb/p/8157556.html

https://www.jianshu.com/p/518fa5d59f89

**https://blog.csdn.net/ctwy291314/article/details/88822130

公钥加密、私钥解密

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

# rsa加密
def rsaEncrypt(str):
    # 生成公钥、私钥
    (pubkey, privkey) = rsa.newkeys(512)
    print("pub: ", pubkey)
    print("priv: ", privkey)
    # 明文编码格式
    content = str.encode('utf-8')
    # 公钥加密
    crypto = rsa.encrypt(content, pubkey)
    return (crypto, privkey)


# rsa解密
def rsaDecrypt(str, pk):
    # 私钥解密
    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)  

密钥导出、签名验证

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

# 先生成一对密钥，然后保存.pem格式文件，当然也可以直接使用
(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公钥和密钥
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)
# 用公钥加密、再用私钥解密
crypto = rsa.encrypt(message.encode('utf-8'), pubkey)
message = rsa.decrypt(crypto, privkey)
message = message.decode('utf-8')
print (message)

# sign 用私钥签名认证、再用公钥验证签名
signature = rsa.sign(message.encode('utf-8'), privkey, 'SHA-1')
method_name = rsa.verify('lovesoo.org'.encode('utf-8'), signature, pubkey)
print(method_name)

对文件进行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: #加密输出
    encrypt_bigfile(infile, outfile, pubkey)

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

4.0的主要变化
版本3.4是3.x范围内的最后一个版本。版本4.0删除了以下模块，因为它们不安全：

rsa._version133
rsa._version200
rsa.bigfile
rsa.varblock
这些模块在3.4版中被标记为已弃用。

此外，在4.0中，I / O函数经过简化，可以在所有支持的Python版本上使用字节。

4.0版本不再支持Python 2.6和3.3。