pkcs7 python ecb ebe



一、关于PyCrypto
   由于我们今天主要调用PyCrypto库来实现加密，所以这里还是稍微做些介绍吧！PyCrypto是一个免费的加密算法库，支持常见的DES、AES加密以及MD5、SHA各种HASH运算。我们可以在其官方主页下载最新版本：https://www.dlitz.net/software/pycrypto/，我编写程序时最新的是v2.6.1，下载之后得到一个zip的发布包，其中提供了setup.py文件，可以知道该程序包是使用Distutils分发的，基本的命令应该是:

点击(此处)折叠或打开
python setup.py build
python setup.py install

=====如果提示找不到python.h要么python版本不是2.6要么就是没有devel安装

yum install python-devel

function mcrypt_decrypt ($cipher, $key, $data, $mode, $iv = null) {}

$str = str_replace(array('[0]', '[1]'), array('+', '/'), $str);
  $str = base64_decode($str);

  $key = strtoupper(md5($_secret_key));

  $string = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $str, MCRYPT_MODE_ECB);

class MyCrypt():
    def __init__(self, key):
        self.key = key
        self.mode = AES.MODE_ECB
        self.padding = '\0'
 
    def encrypt(self, text):
        cryptor = AES.new(self.key, self.mode)
        length = 16
        count = text.count('')
        if count < length:
            add = (length - count) + 1
            text += (self.padding * add)
        elif count > length:
            add = (length - (count % length)) + 1
            text += (self.padding * add)
        self.ciphertext = cryptor.encrypt(text)
        return self.ciphertext
 
    def decrypt(self, text):
        cryptor = AES.new(self.key, self.mode)
        plain_text = cryptor.decrypt(text)
        return plain_text.rstrip("\0")
 
if __name__ == '__main__':
    key = '1234567890abcdef'
    data = '{"a": "123中文", sss} '
    ec = MyCrypt(key)
    encrpt_data = ec.encrypt(data)
    decrpt_data = ec.decrypt(encrpt_data)
    print encrpt_data, decrpt_data, decrpt_data == data
 
    from base64 import b64encode, b64decode
    print b64encode(encrpt_data)

=========

====  ====
#!/usr/bin/env python
# -*- coding:utf-8 -*-
#@author: rui.xu
#这里使用pycrypto?库
#按照方法:easy_install pycrypto?
 
from Crypto.Cipher import AES
from binascii import b2a_hex, a2b_hex
 
class prpcrypt():
    def __init__(self,key):
        self.key = key
        self.mode = AES.MODE_CBC
    
    #加密函数，如果text不足16位就用空格补足为16位，
    #如果大于16当时不是16的倍数，那就补足为16的倍数。
    def encrypt(self,text):
        cryptor = AES.new(self.key,self.mode)
        #这里密钥key 长度必须为16（AES-128）,
        #24（AES-192）,或者32 （AES-256）Bytes 长度
        #目前AES-128 足够目前使用
        length = 16
        count = len(text)
        if count < length:
            add = (length-count)
            #\0 backspace
            text = text + ('\0' * add)
        elif count > length:
            add = (length-(count % length))
            text = text + ('\0' * add)
        self.ciphertext = cryptor.encrypt(text)
        #因为AES加密时候得到的字符串不一定是ascii字符集的，输出到终端或者保存时候可能存在问题
        #所以这里统一把加密后的字符串转化为16进制字符串
        return b2a_hex(self.ciphertext)
    
    #解密后，去掉补足的空格用strip() 去掉
    def decrypt(self,text):
        cryptor = AES.new(self.key,self.mode)
        plain_text  = cryptor.decrypt(a2b_hex(text))
        return plain_text.rstrip('\0')
 
if __name__ == '__main__':
    pc = prpcrypt('keyskeyskeyskeys') #初始化密钥
    import sys
    e = pc.encrypt(sys.argv[1]) #加密
    d = pc.decrypt(e) #解密
    print "加密:",e
    print "解密:",d

======pkcs7 这个蛮重要的，不然就不一样的编码了。。。。
For Linux or Mac and other OS:
        https://www.dlitz.net/software/pycrypto/

Step 2: Keep pkcs7.py file in your root directory.

https://github.com/janglin/crypto-pkcs7-example/blob/master/pkcs7.py

Step 3: First you have to define a self-created 16 digit key( key and IV will be 16 digit, 32,64…) which you know, only that key will decrypt data otherwise it will not decrypt. Here I am doing encoding by PKCS7 then encryption by crypto and again encoded by base64.

How to decrypt data

For decryption we have to follow apposite procedure means 1st  we have to decode by base64 , decrypt by Crypto and then decode by PKCS7.

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decodetext =  base64.b64decode(enc_cipher)
aes = AES.new(key, AES.MODE_CBC, iv)
cipher = aes.<b style="color:#000;background:#66ff99">decrypt</b>(decodetext)
pad_text = encoder.decode(cipher)
print pad_text