c# - 使用 C# 读取 .p7m 文件

Question

如何使用 C# 应用程序检索 .P7M 文件的所有信息。示例 .p7m 文件:如果可能的话，请给我代码或示例链接

MIME-Version: 1.0
Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="----6975263937A7DDC0C0034052D76E8275"

This is an S/MIME signed message

------6975263937A7DDC0C0034052D76E8275
MIME-Version: 1.0
Subject: MVCI - Restart Needed a
X-Relevance-Evaluation-Period: 0:0:1
X-Relevance-Child-Evaluation-Period: 0:0:1
Content-Type: multipart/digest; boundary="AD27641"

--AD27641

Subject: MVCI - Restart Needed a
X-Relevant-When: pending restart and (not exists file "C:\Windows\System32\No_Reboot.txt")
X-Fixlet-ID: 27641
X-Fixlet-Category: Computer Support
X-Fixlet-Source: BigFix
X-Fixlet-Source-Severity: Moderate
X-Fixlet-Source-ID: <Unspecified>
X-Fixlet-Source-Release-Date: 9/12/2006
X-Fixlet-Download-Size: 0
Content-Type: multipart/related; boundary="F27641"

--F27641
Content-Type: text/html; charset=us-ascii

<custom>
--F27641
Content-id: Action1
Content-Type: application/x-Fixlet-Windows-Shell

// only run this action on computers that are not locked
continue if {not locked of action lock state}

restart
action requires restart

// only run this action on computers that are not locked
continue if {not locked of action lock state}

action parameter query "RestartWaitTime" with description "Please enter the number of seconds to wait after warning the user before forcing a restart on the computer:"

restart {parameter "RestartWaitTime" of action}
action requires restart

--F27641--

--AD27641--

------6975263937A7DDC0C0034052D76E8275
Content-Type: application/x-pkcs7-signature; name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"

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------6975263937A7DDC0C0034052D76E8275--

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如果有任何建议和问题请回放然后告诉我。我在等待重播。

Answer 1

作为上面发布的非免费/非开源解决方案的替代方案，我建议您查看我的免费/开源 S/MIME 库:MimeKit

要处理您的输入数据，您需要执行以下操作:

var entity = MimeEntity.Load (stream);

if (entity is MultipartSigned) {
    var signed = (MultipartSigned) entity;

    foreach (var signature in signed.Verify ()) {
        try {
            bool valid = signature.Verify ();

            // If valid is true, then it signifies that the signed content has
            // not been modified since this particular signer signed the content.
            //
            // However, if it is false, then it indicates that the signed content
            // has been modified.
        } catch (DigitalSignatureVerifyException) {
            // There was an error verifying the signature.
        }

        // If you'd like to get a copy of the certificate used for signing,
        // you could do this:
        var wrapper = (SecureMimeDigitalCertificate) signature.Certificate;
        var cert = wrapper.Certificate;

        // The cert is a BouncyCastle X509Certificate, so if you want to convert
        // it to a System.Security X509Certificate2, you can do this:
        var x509certificate2 = new X509Certificate2 (cert.GetEncoded ());
    }
}