Question

我有一个用于创建加密电子邮件的电子邮件应用程序。它在Outlook中运行良好，我发送电子邮件的所有电子邮件交易对手都没有问题报告。但是，当我尝试使用Mimekit解密它时，我得到一个“错误数据”异常。

一些堆栈跟踪：

at System.Security.Cryptography.Pkcs.EnvelopedCms.DecryptContent(RecipientInfoCollection recipientInfos, X509Certificate2Collection extraStore)   
at System.Security.Cryptography.Pkcs.EnvelopedCms.Decrypt()
at MimeKit.Cryptography.WindowsSecure...

我的电子邮件mime看起来像这样：

From: x <x@x.com>
To: x <x2@x.com>
Subject:
 xxxxxxxx
 07-03-2014 14:48:46
Thread-Topic:
 xxxxxxx
 07-03-2014 14:48:46
Thread-Index: AQHPOgv3JHiUE6wuJk+EQu4eAA1oDA==
Date: Fri, 7 Mar 2014 14:48:48 +0100
Message-ID: <x>
Accept-Language: da-DK, en-US
Content-Language: en-US
Content-Type: application/pkcs7-mime; name="smime.p7m";
    smime-type=enveloped-data
Content-Disposition: attachment; filename="smime.p7m"
Content-Transfer-Encoding: base64
MIME-Version: 1.0

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Nuq2uYSRu4p5K4+lEAyRM2cdiPLVcDuGKQpBGQnhsB6DslLImiYXSzy6OcHIsUf4kyAGes5tsBxR
i1IfNHcW4G/7i4VUy+530PqA0+TECNkpgiGxrevWk0gF0NgD+DDNgDzZRjJaRpMx0ufbP9twVvv+
6J/meqKiykYcU/NUYV/TuNiERKrOOWZs697IyY/g3nPWHZurZXJbmk9MpND2wn5PZzRTx7qyBVfn
nenl/WtSVMmKA4D1dLnHoeN1hoAyQgrfqS4yymL26UemhCXIV87hAYwwoAbpfr4=

这是我执行加密的方式：

public static string EncryptContent(string content, X509Certificate2 certificate)
{
    byte[] contentBytes = Encoding.ASCII.GetBytes(content);

    var envelopedCms = new EnvelopedCms(SubjectIdentifierType.IssuerAndSerialNumber, new ContentInfo(contentBytes));
    var recipient = new CmsRecipient(SubjectIdentifierType.IssuerAndSerialNumber, certificate);

    envelopedCms.Encrypt(recipient);
    var encodedData = envelopedCms.Encode();
    var encodedDataBase64 = Convert.ToBase64String(encodedData, Base64FormattingOptions.InsertLineBreaks);

    return encodedDataBase64;
}

这就是我尝试解密的方式：

var primarySecureMimeContext = CreateSecureMimeContext(certificateInfo.PrimaryCertificate,
                                                                   certificateInfo.PrimaryPassword);
            var primaryDecryptedEntity = entity.Decrypt(primarySecureMimeContext);


private SecureMimeContext CreateSecureMimeContext(string certificateFilename, string certificatePassword)
    {
        var secureMimeContext = new WindowsSecureMimeContext();
        var certificate = new X509Certificate2(certificateFilename,
                                               certificatePassword);
        var bouncyX509Certificate = Org.BouncyCastle.Security.DotNetUtilities.FromX509Certificate(certificate);
        secureMimeContext.Import(bouncyX509Certificate);
        return secureMimeContext;
    }

当我直接使用封装的cms解密内容时，没有问题。

这是我自己解密后的电子邮件：

Content-Type: multipart/mixed;
    boundary="5511bd79-26dc-41e5-ac96-7adfdea5f6e5"

--5511bd79-26dc-41e5-ac96-7adfdea5f6e5
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable


--5511bd79-26dc-41e5-ac96-7adfdea5f6e5
Content-Type: application/octet-stream;
    name="TestFile.txt"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
    filename="TestFile.txt"

77u/VGVlZWVlZXN0
--5511bd79-26dc-41e5-ac96-7adfdea5f6e5--

任何人都可以看到导致这种情况的原因吗？

使用jstedfast建议的DummySecureMimeContext后，它可以工作。可以在此处找到更全面的演练：https://github.com/jstedfast/MimeKit/issues/38

Answer 1

我认为问题在于您将证书添加到上下文中的方式：

private SecureMimeContext CreateSecureMimeContext(string certificateFilename, string certificatePassword)
{
    var secureMimeContext = new WindowsSecureMimeContext();
    var certificate = new X509Certificate2(certificateFilename,
                                           certificatePassword);
    var bouncyX509Certificate = Org.BouncyCastle.Security.DotNetUtilities.FromX509Certificate(certificate);
    secureMimeContext.Import(bouncyX509Certificate);
    return secureMimeContext;
}

这样做是将证书添加到AddressBook证书存储区，但是您实际想要添加它以便解密它（因为您还需要私钥密码）是个人证书存储区。 / p>

试试这个：

private SecureMimeContext CreateSecureMimeContext (string certificateFilename, string certificatePassword)
{
    var secureMimeContext = new WindowsSecureMimeContext ();

    using (var stream = File.OpenRead (certificateFilename))
        secureMimeContext.Import (stream, certificatePassword);

    return secureMimeContext;
}

您获得的异常消息不是很有帮助，但我猜这意味着它无法找到证书和/或私钥。我写了一个测试程序并且没有成功再现这个bug，所以我可能是错的......但由于我的证书/私钥已经导入我的个人证书库，我不知道如何删除它们来测试这个理论

让我知道这对你有用。

更新：哎呀，我做错了。刚刚更新了上面的CreateSecureMimeContext（）以打开证书文件流，因为WindowsSecureMimeContext.Import（）接受流而不是文件名。

Mimekit在解密电子邮件时导致错误数据

1 个答案: