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

发布于 2024-12-03 06:02:45 字数 358 浏览 1 评论 0 原文

我有一封签名电子邮件作为字符串。我想获取带有完整未签名消息的字符串，其中包含附件和正文，我可以使用它进行解析，例如 Mail gem。

我发现问题：解码/提取 smime .p7m 文件内容（带有嵌入文件的电子邮件）与 OpenSSL？现在我知道如何通过命令行执行此操作。

我可以将字符串转储到临时文件，通过命令行解密，然后解析它。但这不是一个好主意。我想为 Ruby 使用 OpenSSL 库。

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山人契 2024-12-10 06:02:45

我想我应该写一个解决方案，因为我花了很长时间才弄清楚这个问题。另请参阅我上面的评论，了解此内容的来源：

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))

I thought I'd write up a solution, because it took me quite some time to figure this out. Also see my comment above on where this was taken from:

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))

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