Question

我为Encrypt / Decrypt Streams编写了一个代码块。代码在我的本地机器上工作。但是当我在网上发布我的代码时解密函数抛出“错误数据”异常这是我的加密和解密功能

private static MemoryStream EncryptStream(XmlDocument xmlDoc, XmlElement elementToEncrypt, string password)
{
    CspParameters cspParams = new CspParameters();
    cspParams.KeyContainerName = password;
    RSACryptoServiceProvider rsaKey = new RSACryptoServiceProvider(cspParams);
    RijndaelManaged sessionKey = null;
    try
    {

        if (xmlDoc == null)
            throw new ArgumentNullException("xmlDoc");
        if (rsaKey == null)
            throw new ArgumentNullException("rsaKey");
        if (elementToEncrypt == null)
            throw new ArgumentNullException("elementToEncrypt");

        sessionKey = new RijndaelManaged();
        sessionKey.KeySize = 256;

        EncryptedXml eXml = new EncryptedXml();
        byte[] encryptedElement = eXml.EncryptData(elementToEncrypt, sessionKey, false);

        EncryptedData edElement = new EncryptedData();
        edElement.Type = EncryptedXml.XmlEncElementUrl;
        edElement.Id = EncryptionElementID;
        edElement.EncryptionMethod = new EncryptionMethod(EncryptedXml.XmlEncAES256Url);

        EncryptedKey ek = new EncryptedKey();
        byte[] encryptedKey = EncryptedXml.EncryptKey(sessionKey.Key, rsaKey, false);
        ek.CipherData = new CipherData(encryptedKey);
        ek.EncryptionMethod = new EncryptionMethod(EncryptedXml.XmlEncRSA15Url);

        edElement.KeyInfo = new KeyInfo();

        KeyInfoName kin = new KeyInfoName();
        kin.Value = KeyName;

        ek.KeyInfo.AddClause(kin);
        edElement.CipherData.CipherValue = encryptedElement;
        edElement.KeyInfo.AddClause(new KeyInfoEncryptedKey(ek));

        EncryptedXml.ReplaceElement(elementToEncrypt, edElement, false);

        if (sessionKey != null)
        {
            sessionKey.Clear();
        }
        rsaKey.Clear();
        MemoryStream stream = new MemoryStream();
        xmlDoc.Save(stream);
        stream.Position = 0;
        Encoding encodeing = System.Text.UnicodeEncoding.Default;
        return stream;
    }
    catch (Exception e)
    {
        if (sessionKey != null)
        {
            sessionKey.Clear();
        }
        rsaKey.Clear();
        throw (e);
    }
}

private static MemoryStream DecryptStream(XmlDocument xmlDoc, string password)
{
    CspParameters cspParams = new CspParameters();
    cspParams.KeyContainerName = password;
    RSACryptoServiceProvider rsaKey = new RSACryptoServiceProvider(cspParams);
    EncryptedXml exml = null;
    try
    {
        if (xmlDoc == null)
            throw new ArgumentNullException("xmlDoc");
        if (rsaKey == null)
            throw new ArgumentNullException("rsaKey");

        exml = new EncryptedXml(xmlDoc);
        exml.AddKeyNameMapping(KeyName, rsaKey);

        exml.DecryptDocument();
        rsaKey.Clear();

        MemoryStream outStream = new MemoryStream();
        xmlDoc.Save(outStream);
        outStream.Position = 0;
        return outStream;
    }
    catch (Exception e)
    {
        rsaKey.Clear();
        throw (e);
    }
}

在“exml.DecryptDocument（）;”上抛出异常线。

您对问题和解决方案有什么了解吗？

修改

在MSDN页面中，有如下的评论

要将XML加密与X.509证书一起使用，您必须拥有安装了Microsoft Enhanced Cryptographic Provider和X.509 证书必须使用增强型提供商。如果你没有安装了Microsoft Enhanced Cryptographic Provider或X.509 证书不使用增强型提供程序，a 当您启动时，将抛出带有“未知错误”的CryptographicException 解密XML文档。

您对“Microsoft Enhanced Cryptographic Provider”和“X.509 certificate”有什么想法吗？我的问题可以与这些相关吗？

Answer 1

在尝试解密另一台PC时，解密功能抛出“错误数据”异常的原因是CspParameters链接到运行加密的PC上的会话。

需要在XML中嵌入和加密cspParams对象，以便在另一台PC上启用Decryption。幸运的是，我们可以使用EncryptionProperty。

private static MemoryStream EncryptStream(XmlDocument xmlDoc, XmlElement elementToEncrypt, string password)
{
    CspParameters cspParams = new CspParameters();
    cspParams.KeyContainerName = password;
    RSACryptoServiceProvider rsaKey = new RSACryptoServiceProvider(cspParams);
    RijndaelManaged sessionKey = null;
    try
    {
        if (xmlDoc == null)
            throw new ArgumentNullException("xmlDoc");
        if (rsaKey == null)
            throw new ArgumentNullException("rsaKey");
        if (elementToEncrypt == null)
            throw new ArgumentNullException("elementToEncrypt");

        sessionKey = new RijndaelManaged();
        sessionKey.KeySize = 256;

        EncryptedXml eXml = new EncryptedXml();
        byte[] encryptedElement = eXml.EncryptData(elementToEncrypt, sessionKey, false);

        EncryptedData edElement = new EncryptedData();
        edElement.Type = EncryptedXml.XmlEncElementUrl;
        edElement.Id = EncryptionElementID;
        edElement.EncryptionMethod = new EncryptionMethod(EncryptedXml.XmlEncAES256Url);

        EncryptedKey ek = new EncryptedKey();
        byte[] encryptedKey = EncryptedXml.EncryptKey(sessionKey.Key, rsaKey, false);
        ek.CipherData = new CipherData(encryptedKey);
        ek.EncryptionMethod = new EncryptionMethod(EncryptedXml.XmlEncRSA15Url);

        // Save some more information about the key using the EncryptionProperty element.

        // Create a new "EncryptionProperty" XmlElement object. 
        var property = new XmlDocument().CreateElement("EncryptionProperty", EncryptedXml.XmlEncNamespaceUrl);

        // Set the value of the EncryptionProperty" XmlElement object.
        property.InnerText = RijndaelManagedEncryption.EncryptRijndael(Convert.ToBase64String(rsaKey.ExportCspBlob(true)),
                        "Your Salt string here");

        // Create the EncryptionProperty object using the XmlElement object. 
        var encProperty = new EncryptionProperty(property);

        // Add the EncryptionProperty object to the EncryptedKey object.
        ek.AddProperty(encProperty);

        edElement.KeyInfo = new KeyInfo();

        KeyInfoName kin = new KeyInfoName();
        kin.Value = KeyName;

        ek.KeyInfo.AddClause(kin);
        edElement.CipherData.CipherValue = encryptedElement;
        edElement.KeyInfo.AddClause(new KeyInfoEncryptedKey(ek));

        EncryptedXml.ReplaceElement(elementToEncrypt, edElement, false);

        if (sessionKey != null)
        {
            sessionKey.Clear();
        }
        rsaKey.Clear();
        MemoryStream stream = new MemoryStream();
        xmlDoc.Save(stream);
        stream.Position = 0;
        Encoding encodeing = System.Text.UnicodeEncoding.Default;
        return stream;
    }
    catch (Exception)
    {
        if (sessionKey != null)
        {
            sessionKey.Clear();
        }
        rsaKey.Clear();
        throw;
    }
}

private static MemoryStream DecryptStream(XmlDocument xmlDoc, string password)
{
    CspParameters cspParams = new CspParameters();
    cspParams.KeyContainerName = password;
    RSACryptoServiceProvider rsaKey = new RSACryptoServiceProvider(cspParams);

    var keyInfo = xmlDoc.GetElementsByTagName("EncryptionProperty")[0].InnerText;
        rsaKey.ImportCspBlob(
            Convert.FromBase64String(RijndaelManagedEncryption.DecryptRijndael(keyInfo,
                "Your Salt string here")));
    EncryptedXml exml = null;
    try
    {
        if (xmlDoc == null)
            throw new ArgumentNullException("xmlDoc");
        if (rsaKey == null)
            throw new ArgumentNullException("rsaKey");

        exml = new EncryptedXml(xmlDoc);
        exml.AddKeyNameMapping(KeyName, rsaKey);

        exml.DecryptDocument();
        rsaKey.Clear();

        MemoryStream outStream = new MemoryStream();
        xmlDoc.Save(outStream);
        outStream.Position = 0;
        return outStream;
    }
    catch (Exception)
    {
        rsaKey.Clear();
        throw;
    }
}

查看RijndaelManagedEncryption类的here。

Answer 2

不要重新发明加密协议。 你会错的。例如，错误处理存储在CSPs中的RSA密钥并期望它们神奇地出现在任何机器上。

要加密传输中的数据，请使用SSL / TLS。 .Net提供了与SslStream开箱即用的功能。对于WCF，请参阅How to: Configure an IIS-hosted WCF service with SSL。

EncryptedXml DecryptDocument方法抛出“错误数据”异常

2 个答案: