python的rsa公钥解密方法 python的rsa公钥解密方法

示例：

# -*- coding: UTF-8 -*- import M2Crypto import base64 #私钥加密，公钥解密 def pri_encrypt(msg, file_name): rsa_pri = M2Crypto.RSA.load_key(file_name) ctxt_pri = rsa_pri.private_encrypt(msg, M2Crypto.RSA.pkcs1_padding) #这里的方法选择加密填充方式，所以在解密的时候要对应。 ctxt64_pri = base64.b64encode(ctxt_pri)#密文是base64 方便保存 encode成str print ('密文:%s'% ctxt64_pri) return ctxt64_pri def pub_decrypt_with_pubkeyfile(msg, file_name): rsa_pub = M2Crypto.RSA.load_pub_key(file_name) pub_decrypt(msg, rsa_pub) def pub_decrypt_with_pubkeystr(msg, pub_key): #将pub_key转成bio对象,再将bio对象转换成公钥对象 bio = M2Crypto.BIO.MemoryBuffer(pub_key) rsa_pub = M2Crypto.RSA.load_pub_key_bio(bio) pub_decrypt(msg, rsa_pub) def pub_decrypt(msg, rsa_pub): ctxt_pri = base64.b64decode(msg) # 先将str转成base64 maxlength = 128 output = '' while ctxt_pri: input = ctxt_pri[:maxlength] ctxt_pri = ctxt_pri[maxlength:] out = rsa_pub.public_decrypt(input, M2Crypto.RSA.pkcs1_padding) #解密 output = output + out print('明文:%s'% output) if __name__ == "__main__": prikey_file = './rsa/rsa_private_key.pem' pubkey_file = './rsa/rsa_public_key.pem' msg = 'Test String.' primsg = pri_encrypt(msg, prikey_file) pub_decrypt(primsg, pubkey_file)

公钥信息，要有开头和结尾信息：

pkey_str = '''-----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC2kcrRvxURhFijDoPpqZ/IgPlA gppkKrek6wSrua1zBiGTwHI2f+YCa5vC1JEiIi9uw4srS0OSCB6kY3bP2DGJagBo Egj/rYAGjtYJxJrEiTxVs5/GfPuQBYmU0XAtPXFzciZy446VPJLHMPnmTALmIOR5 Dddd1Zklod9IQBMjjwIDAQAB -----END PUBLIC KEY-----'''

python base64 decode incorrect padding错误解决方法

个人觉得原因应该是不同的语言/base64库编码规则不太统一的问题。 python中base64串的长度需为4的整数倍，故对长度不为4整数倍的base64串需要用"='补足

如下代码： data为base64编码字符串，经过补齐后的data即可被python base64解码
missing_padding = 4 - len(data) % 4 if missing_padding: data += b'=' * missing_pad ding
base64.b64decode(data))

其实一般使用场景是，私钥签名，公钥验证：
https://www.cnblogs.com/hhh5460/p/5243410.html
【python的rsa公钥解密方法】

#!/usr/bin/env python # -*- coding: utf-8 -*- """ @Author: xxx @Date: 2019-01-30 14:07 @Description : 本文件的作用描述 @File: login_with_janus.py """import M2Crypto import base64 import os import logging import jsonlogger = logging.getLogger('operation')current_path = os.path.dirname(os.path.dirname(os.path.abspath(__file__))) pub_key_file = os.path.abspath(os.path.join(current_path, "utils", "jar_file", "janus.pub"))def decrypt_by_default_public_key(token): # 补齐padding，这是因为java加密的长度和python加密的长度不一致 missing_padding = 4 - len(token) % 4 if missing_padding: token += '=' * missing_padding token = token.replace(" ", "+") rsa_pub = M2Crypto.RSA.load_pub_key(pub_key_file) # 先进行base64解码 logging.info(len(token)) cipher = base64.b64decode(token) maxlength = 128 output = '' while cipher: _input = cipher[:maxlength] cipher = cipher[maxlength:] out = rsa_pub.public_decrypt(_input, M2Crypto.RSA.pkcs1_padding)# 解密 output = output + out.decode() user_info = json.loads(output) return user_info

这篇文章：https://cloud.tencent.com/developer/article/1039467，没有尝试走通
参考：
https://blog.csdn.net/nyist327/article/details/48496595
https://www.cnblogs.com/yaks/p/6890625.html
转载于:https://www.cnblogs.com/shengulong/p/10339881.html