create or verify the signature of the pkcs7

Hello

I'm working on windows xp sp3. Visula studio 2008.

Please check the code to generate and check the pkcs7 signature SHA2 support below

exception is raising to the

function: signCMS.CheckSignature (false);

exceptions: System.Security.Cryptography.CryptographicException: could not find the original signer.

This code is correct?

Please help me.

CspParameters csp = new CspParameters (24, "Microsoft Enhanced RSA and AES Cryptographic Provider (Prototype)" ");
CSP. KeyNumber = (int) KeyNumber.Signature;
CSP. KeyContainerName = "MyCont";
CSP. Flags = CspProviderFlags.UseMachineKeyStore;
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider (csp);
Byte [] PlainData = new byte [] {23, 54, 2, 3, 5, 2, 5, 2};
ContentInfo contInfo = new ContentInfo (PlainData);
CmsSigner cmssigner = new CmsSigner (csp);
CmsSigner. DigestAlgorithm = new Oid ("sha256");
CmsSigner. IncludeOption = System.Security.Cryptography.X509Certificates.X509IncludeOption.WholeChain;
SignedCms signCMS = new SignedCms (contInfo);
signCMS.ComputeSignature (cmssigner);
Byte [] "signed data" = signCMS.Encode ();
ContentInfo contVerify = new ContentInfo (SignedData);
signCMS = new SignedCms (contVerify);
signCMS.Decode (SignedData);
signCMS.CheckSignature (false); System.Security.Cryptography.CryptographicException: Could not find the original signer.

Hello

The question you have posted is related to Visual Studio and will be well suited in the MSDN Community. Click on the link below.

http://social.msdn.Microsoft.com/forums/EU/category/VisualStudio

Thanks and regards.

Thahaseena M
Microsoft Answers Support Engineer.

Tags: Windows

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