ruby - 如何使用 Ruby OpenSSL 库解码/提取 SMIME 签名电子邮件的 smime.p7m 文件内容

Question

我有一个签名的电子邮件消息作为字符串。我想获取带有附件和正文的完整未签名消息的字符串，我可以使用这些消息进行解析，例如 Mail gem。

我找到了问题:Decode/extract smime.p7m file contents (email with embedded files) with OpenSSL?现在我知道如何通过命令行来完成了。

我可以将我的字符串转储到临时文件，通过命令行解密，然后解析它。但这不是什么好主意。我想为 Ruby 使用 OpenSSL 库。

Answer 1

我想我应该写一个解决方案，因为我花了很长时间才弄明白。另请参阅我上面关于从何处获取的评论:

include OpenSSL

# assuming that mail contains the message that you have likely fetched with the mail gem
data = mail.to_s

# load your certificate and key
# if you need to convert from a .p12 file for example 
# check this https://stackoverflow.com/questions/13732826/convert-pem-to-crt-and-key
cert = X509::Certificate.new(File::read("your_cert.cer"))
key = PKey::RSA.new(File::read("your.key"))

# load the encrypted mail
p7enc = PKCS7::read_smime(data)

# this is the plain email that you can read back into the mail gem and extract the required data
Mail.read_from_string(p7enc.decrypt(key, cert))