解密从电子邮件附加的gpg文件（file.pgp）

问题描述

我正在使用email.Message类和gnupg库来

I'm using email.Message class and gnupg library to:

1-解析从Twisted imap4客户端获取的电子邮件字符串。

1 - parse email string fetched from Twisted imap4 client.

2-获取附件，.pgp

2 - get the attached file, a .pgp

3-解密。

我可以解密典型的邮件内容，例如：

I can decrypt typical mail content, as:

-----BEGIN PGP MESSAGE-----
Version: PGP 9
(...)
-----END PGP MESSAGE-----

，但是依恋确实使我的生活变得地狱。

but the attachment affair is really making my life a hell.

我尝试了很多不同的方法，但是最合乎逻辑的应该是：

Well, I tried a lot of different ways, but the most logical should be this:

message = email.message_from_string(content)
if message.is_multipart():
    attachment = message.get_payload(1)
    gpg = gnupg.GPG(gnupghome=settings.PGP_PATH)
    return gpg.decrypt_file(attachment.get_payload(), passphrase=settings.PGP_PASSPH)

附件var的第一行是：

The attachment var first lines are:

From nobody Mon Oct 15 18:54:12 2012
Content-type: application/octet-stream;
 name="No_Norm_AMLT_908_1210201201.txt.pgp"
Content-Disposition: attachment; filename="No_Norm_AMLT_908_1210201201.txt.pgp"
Content-Transfer-Encoding: base64

然后是所有加密的东西。

And then all the encrypted stuff.

反正...真的很奇怪，有些东西我没得到。如果从普通的邮件客户端软件（例如Thunderbird）下载附件，则会得到一个看起来是二进制的.pgp文件（如果使用纯文本编辑器编辑该附件，则会出现奇怪的字符），并且可以使用bash命令对其进行解密：

Anyway... it's really strange, there's something I don't get. If I download the attachment from a normal mail client software (i.e. Thunderbird) I get a .pgp file that seems binary (strange characters appears if I edit it with a plain text editor) and I can decrypt it using the bash command:

gpg --decrypt No_Norm_AMLT_908_1210201201.txt.pgp

我不知道如何使用email.Message类和gnupg获得相同的结果（解密文件），我试图将附件的有效内容保存到文件中，这是与从Thunderbird下载的文件不同，我无法解密它，我还尝试将其放入StringIO，并使用base64对其进行编码。

I don't know how to get the same result (the file decrypted) using email.Message class and gnupg, I tried to save the payload of the attachment to a file, and this is different from the downloaded from Thunderbird one, I can't decrypt it, I tried also to put it into a StringIO, and also encoding it with base64.

我收到的消息从gpg获得的是：

The message I get from gpg is:

[GNUPG:] NODATA 1
[GNUPG:] NODATA 2
gpg: decrypt_message failed: eof

谢谢！

推荐答案

好了！我必须：

base64.decodestring(attachment.get_payload())

然后使用gpg对其解密，然后开始工作。可以通过以下标头找出原因：

then decrypt it using gpg, and worked. This can be figured out because of the header:

Content-Transfer-Encoding: base64

最终代码是：

message = email.message_from_string(content)
if message.is_multipart():
    attachment = message.get_payload(1)
    gpg = gnupg.GPG(gnupghome=settings.PGP_PATH)
    return gpg.decrypt_file(base64.decodestring(attachment.get_payload()),
                            passphrase=settings.PGP_PASSPH)

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