在 MSDN site about SignedXml 的帮助下,我可以很容易地验证 XML DSig 是否正确。如果使用 sha1 签名方法,它会完美地工作。
但是,当我收到 SignatureMethod RSA-SHA512 ( http://www.w3.org/2001/04/xmldsig-more#rsa-sha512 ) 时,CheckSignature() 因 CryptograhicException 中断:无法为提供的签名算法创建 SignatureDescription。
CheckSignature() 似乎无法验证 RSA-SHA512 签名。
有谁知道如何检查这些签名?
从 MSDN 站点获取的代码是:
public static bool VerifyXml(XmlDocument doc, bool removeSignatureElement = false)
{
// Check arguments.
if (doc == null)
throw new ArgumentException("doc");
// Create a new SignedXml object and pass it the XML document class.
SignedXml signedXml = new SignedXml(doc);
// Find the "Signature" node and create a new XmlNodeList object.
XmlNodeList nodeList = doc.GetElementsByTagName("Signature", Constants.NamespaceDSig);
// Throw an exception if no signature was found.
if (nodeList.Count < 1)
{
throw new CryptographicException("Verification failed: No Signature was found in the document.");
}
// This example only supports one signature for the entire XML document. Throw an exception if more than one signature was found.
if (nodeList.Count > 1)
{
throw new CryptographicException("Verification failed: More that one signature was found for the document.");
}
// Load the first <signature> node.
signedXml.LoadXml((XmlElement)nodeList[0]);
// Check the signature and return the result.
bool signedCorrectly = signedXml.CheckSignature(); // throws the Exception!!!
return signedCorrectly;
}
签名的 XML 是:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<Notification xmlns="http://www.xxxxxxxxxxx.xx/xxxxx">
<xenc:EncryptedData xmlns:xenc="http://www.w3.org/2001/04/xmlenc#" Type="http://www.w3.org/2001/04/xmlenc#Content"> ... </xenc:EncryptedData>
<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
<ds:SignedInfo>
<ds:CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
<ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha512"/>
<ds:Reference URI="">
<ds:Transforms>
<ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
<ds:Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments"/>
</ds:Transforms>
<ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
<ds:DigestValue>WsHcyNL7Jh8HSzR9ArzTqomBkHs=</ds:DigestValue>
</ds:Reference>
</ds:SignedInfo>
<ds:SignatureValue>
pWDatSEbypIUVQR9NFmLkB9kKWjMb6rKWGFFvGqT5tOUILeDhMHUqjCRB9v/g6yYdogC9TRWouhz
...VoZAIBs7EqCbLt7RgpB4GHWc9E3qp65NaCgluw==
</ds:SignatureValue>
<ds:KeyInfo>
<ds:X509Data>
<ds:X509Certificate>
MIIG+zCCBOOgAwIBAgIHAe2+sRfTfDANBgkqhkiG9w0BAQUFADCBkTELMAkGA1UEBhMCQVQxDTAL
...tvawqBjOfkw1yeDzsDMJHfMuAcpYfrEL
</ds:X509Certificate>
</ds:X509Data>
</ds:KeyInfo>
</ds:Signature>
</Notification>
最佳答案
您可以验证RSA SHA512签名,但您必须自己实现并注册签名描述。
签名说明:
public sealed class RSAPKCS1SHA512SignatureDescription : SignatureDescription
{
public RSAPKCS1SHA512SignatureDescription()
{
KeyAlgorithm = typeof( RSACryptoServiceProvider ).FullName;
DigestAlgorithm = typeof( SHA512Managed ).FullName;
FormatterAlgorithm = typeof( RSAPKCS1SignatureFormatter ).FullName;
DeformatterAlgorithm = typeof( RSAPKCS1SignatureDeformatter ).FullName;
}
public override AsymmetricSignatureDeformatter CreateDeformatter( AsymmetricAlgorithm key )
{
if( key == null )
{
throw new ArgumentNullException( "key" );
}
var deformatter = new RSAPKCS1SignatureDeformatter( key );
deformatter.SetHashAlgorithm( "SHA512" );
return deformatter;
}
public override AsymmetricSignatureFormatter CreateFormatter( AsymmetricAlgorithm key )
{
if( key == null )
{
throw new ArgumentNullException( "key" );
}
var formatter = new RSAPKCS1SignatureFormatter( key );
formatter.SetHashAlgorithm( "SHA512" );
return formatter;
}
}
在您的代码中,您必须使用 CryptoConfig 注册此描述:
const string XmlDsigRsaSha512 = "http://www.w3.org/2001/04/xmldsig-more#rsa-sha512";
CryptoConfig.AddAlgorithm( typeof( RSAPKCS1SHA512SignatureDescription ), XmlDsigRsaSha512 );
我在 Windows 7 64 位上使用 .Net 4.0 对其进行了测试。
关于c# - 如何在 .NET 中验证 RSA-SHA512 XML 签名?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20499059/