Subject: SignSHA256 is not working
Date: 2015-06-08 14:23:40
From: Per Härdig
Source: signsha256-not-working
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	I have used the example code from the SignandvalidateSHA256_2012 but is getting the error 'Unable to generate xml signature' when signing my assertion. I'm using .net 4.5

	Added the code to global.asax.cs

	protected void Application_Start(object sender, EventArgs e)

	{

	    //Enable SHA-256 XML signature support.

	        CryptoConfig.AddAlgorithm(

	         typeof(RSAPKCS1SHA256SignatureDescription),

	         "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256");

	}

	and then

	CryptoConfig.AddAlgorithm(typeof(RSAPKCS1SHA256SignatureDescription), "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256");

	String CertificatePath;

	var samlResponse = new ComponentPro.Saml2.Response();

	CertificatePath = "Certificate";

	CertificatePath = (CertificatePath.Substring(1, 2) == @":\") ? CertificatePath : Server.MapPath(".") + "\\" + CertificatePath;

	X509Certificate2 signingCert = new X509Certificate2(CertificatePath + "\\per.pfx", "password");

	var assertion = CreateAssertion();

	assertion.Sign(signingCert, "http://www.w3.org/2001/04/xmlenc#sha256", "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256");

	

	Signing SHA1 as below works fine

	assertion.Sign(signingCert);

	Error details:

	ComponentPro.Saml.SamlException was unhandled by user code

	  HResult=-2146233088

	  Message=Unable to generate XML signature.

	  Source=ComponentPro.Saml

	  StackTrace:

	       at ComponentPro.Saml.SamlUtil.ComputeSignature(XmlElement xmlElement, String elementId, AsymmetricAlgorithm signingKey, KeyInfo keyInfo, SignedXml signedXml, String inclusiveNamespacesPrefixList, String digestMethod, String signatureMethod)

	       at ComponentPro.Saml.SamlUtil.ComputeSignature(XmlElement xmlElement, String elementId, AsymmetricAlgorithm signingKey, X509Certificate2Collection x509Certificates, SignedXml signedXml, String inclusiveNamespacesPrefixList, String digestMethod, String signatureMethod)

	       at ComponentPro.Saml.SamlUtil.ComputeSignature(XmlElement xmlElement, String elementId, AsymmetricAlgorithm signingKey, X509Certificate2 x509Certificate, SignedXml signedXml, String inclusiveNamespacesPrefixList, String digestMethod, String signatureMethod)

	       at ComponentPro.Saml.SignableSamlObject.Sign(AsymmetricAlgorithm signingKey, X509Certificate2 x509Certificate, String inclusiveNamespacesPrefixList, String digestMethod, String signatureMethod)

	       at ComponentPro.Saml.SignableSamlObject.Sign(X509Certificate2 x509Certificate, String digestMethod, String signatureMethod)

	       at _Default.CreateSamlResponse() in c:\Users\sehardipe\Documents\Projects\SYMSSO\SYMSSO\Default.aspx.cs:line 76

	       at _Default.Page_Load(Object sender, EventArgs e) in c:\Users\sehardipe\Documents\Projects\SYMSSO\SYMSSO\Default.aspx.cs:line 54

	       at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)

	       at System.Web.UI.Control.OnLoad(EventArgs e)

	       at System.Web.UI.Control.LoadRecursive()

	       at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

	  InnerException: System.Security.Cryptography.CryptographicException

	       HResult=-2146893816

	       Message=Invalid algorithm specified.

	

	       Source=mscorlib

	       StackTrace:

	            at System.Security.Cryptography.CryptographicException.ThrowCryptographicException(Int32 hr)

	            at System.Security.Cryptography.Utils.SignValue(SafeKeyHandle hKey, Int32 keyNumber, Int32 calgKey, Int32 calgHash, Byte[] hash, Int32 cbHash, ObjectHandleOnStack retSignature)

	            at System.Security.Cryptography.Utils.SignValue(SafeKeyHandle hKey, Int32 keyNumber, Int32 calgKey, Int32 calgHash, Byte[] hash)

	            at System.Security.Cryptography.RSACryptoServiceProvider.SignHash(Byte[] rgbHash, Int32 calgHash)

	            at System.Security.Cryptography.RSAPKCS1SignatureFormatter.CreateSignature(Byte[] rgbHash)

	            at System.Security.Cryptography.AsymmetricSignatureFormatter.CreateSignature(HashAlgorithm hash)

	            at System.Security.Cryptography.Xml.SignedXml.ComputeSignature()

	            at ComponentPro.Saml.SamlUtil.ComputeSignature(XmlElement xmlElement, String elementId, AsymmetricAlgorithm signingKey, KeyInfo keyInfo, SignedXml signedXml, String inclusiveNamespacesPrefixList, String digestMethod, String signatureMethod)

	       InnerException:

	 

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