如何使用M2Crypto封装在Python中进行3DES加密？ [英] How to 3DES encrypt in Python using the M2Crypto wrapper?

问题描述

我有一个使用RSA加密的硬件设备的工作测试，在Python中使用M2Crypto。现在我需要测试使用3DES加密的类似设备。但我不知道如何使用M2Crypto做三重DES加密。

I have a working test of a hardware device that uses RSA encryption, in Python using M2Crypto. Now I need to test a similar device that uses 3DES encryption. But I can't figure out how to use M2Crypto to do triple DES encryption.

我知道应该可以从此图表。但不幸的是， M2Crypto的文档我发现是粗略的。 （首页，位于 http://chandlerproject.org/ 似乎已经和Chandler一起走了。）

I know it should be possible from this chart. But unfortunately the documentation of M2Crypto I've found is sketchy. (The homepage at http://chandlerproject.org/ seems to be gone, along with Chandler.)

我搜索了3DES和OpenSSL API 并发现一些难以grok C代码解密，这使它看起来像我需要使用M2Crypto.EVP.Cipher。但我还没有找到任何使用它的DES的例子。我找到的最近的是此博客文章使用它的AES加密。它看起来像我只需要找出正确的参数 M2Crypto.EVP.Cipher .__ init __（）。我会继续挖掘，但我认为值得发布这个问题。

I've searched for 3DES and "OpenSSL API" and found some hard to grok C code for decrypting which makes it look like I need to use M2Crypto.EVP.Cipher. But I haven't found any examples of using it for DES. The closest I've found is this blog post on using it for AES encryption. It looks like I just need to figure out the correct arguments to M2Crypto.EVP.Cipher.__init__(). I'll keep digging, but I thought it worth posting this question.

推荐答案

以下代码适用于我：

with open(keyfile, 'rb') as f:
    key = f.read()
encrypt = 1
cipher = Cipher(alg='des_ede3_ecb', key=key, op=encrypt, iv='\0'*16)
ciphertext = cipher.update(plaintext)
ciphertext += cipher.final()

注意密钥文件是一个24字节

Note the keyfile is a 24-byte (binary) file with parity set as sometimes required for DES.

注意，当使用'des_ede3_ecb'时，我的iv参数被忽略，但我不能通过 None 。）

Note also that the iv argument is (I believe) ignored when using 'des_ede3_ecb', but I couldn't pass None.)

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