使用 .NET 4.6 我尝试执行以下操作:
- 从 PFX 文件加载解密密钥。
- 使用上述文件中的私钥解密 XML 文档。
我的代码基于How to: Decrypt XML Elements with Asymmetric Keys from MSDN。
CspParameters cspParams = new CspParameters();
cspParams.KeyContainerName = "XML_ENC_RSA_KEY";
// Load PFX
X509Certificate2 encryptionPfx = new X509Certificate2(@"file.pfx", "test_password");
RSACryptoServiceProvider rsaKey = new RSACryptoServiceProvider();
rsaKey = encryptionPfx.PrivateKey as RSACryptoServiceProvider;
// Decrypt XML
EncryptedXml encryptedXml = new EncryptedXml(xmlDocument);
encryptedXml.AddKeyNameMapping("TESTKEY", rsaKey);
encryptedXml.DecryptDocument();
运行此代码时,我得到以下InvalidCastException
方法抛出的内容GetDecryptionKey()
:
Object of type "System.Security.Cryptography.RSACryptoServiceProvider" cannot be cast to "System.Security.Cryptography.SymmetricAlgorithm".
据我了解 MSDN 示例,此代码应从EncryptedKey
XML 中提取元素并使用 RSA 密钥解密密钥。
我在这里想念什么?
这是完整的堆栈跟踪:
System.InvalidCastException wurde nicht behandelt.
HResult=-2147467262
Message=Das Objekt des Typs "System.Security.Cryptography.RSACryptoServiceProvider" kann nicht in Typ "System.Security.Cryptography.SymmetricAlgorithm" umgewandelt werden.
Source=System.Security
StackTrace:
bei System.Security.Cryptography.Xml.EncryptedXml.GetDecryptionKey(EncryptedData encryptedData, String symmetricAlgorithmUri)
bei System.Security.Cryptography.Xml.EncryptedXml.DecryptDocument()
bei XML_Encryption_Tools.XmlDecryption.DecryptDocument(XmlDocument xmlDocument) in C:\Users\user\Documents\Visual Studio 2015\Projects\XML Encryption Tools\XML Encryption Tools\XmlDecryption.cs:Zeile 38.
bei XML_Encryption_Tools.Program.Main(String[] args) in C:\Users\user\Documents\Visual Studio 2015\Projects\XML Encryption Tools\XML Encryption Tools\Program.cs:Zeile 17.
bei System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
bei System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
bei Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
bei System.Threading.ThreadHelper.ThreadStart_Context(Object state)
bei System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
bei System.Threading.ThreadHelper.ThreadStart()
InnerException:
这是加密的 XML:
<xenc:EncryptedData xmlns:xenc="http://www.w3.org/2001/04/xmlenc#" Id="G051f21d6-44b8-4ca8-abcd-bcec94a81ffa" Type="http://www.w3.org/2001/04/xmlenc#Element">
<xenc:EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#aes256-cbc"/>
<dsig:KeyInfo xmlns:dsig="http://www.w3.org/2000/09/xmldsig#">
<dsig:KeyName>TESTKEY</dsig:KeyName>
<xenc:EncryptedKey Id="EK65c1fdc2-a757-4482-8238-1d19c5d05006">
<xenc:EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p">
<dsig:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
</xenc:EncryptionMethod>
<xenc:CipherData>
<xenc:CipherValue>Here is cipherValue_1</xenc:CipherValue>
</xenc:CipherData>
</xenc:EncryptedKey>
</dsig:KeyInfo>
<xenc:CipherData>
<xenc:CipherValue>Here is cipherValue_2</xenc:CipherValue>
</xenc:CipherData>
</xenc:EncryptedData>