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POHow to change CSP parameter of RSACryptoServiceProvider
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2012-07-28T09:01:55.440
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2012-07-30T12:29:40.340
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2012-07-28T09:43:57.870
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I am doing rsa-sha256 xml signing using SignedXML class. But the problem is I need to change CSP to support sha256. This is how I am selecting certificate, <pre><code>public X509Certificate2 GetCertificateFromStore() { X509Store st = new X509Store(StoreName.My, StoreLocation.CurrentUser); st.Open(OpenFlags.ReadOnly); X509Certificate2Collection col = st.Certificates.Find(X509FindType.FindByTimeValid, (object)DateTime.Now, false); X509Certificate2 x509Certificate =null; X509Certificate2Collection sel = X509Certificate2UI.SelectFromCollection(col, "Certificate", "Select single certificate to sign", X509SelectionFlag.SingleSelection); if (sel.Count > 0) { X509Certificate2Enumerator en = sel.GetEnumerator(); en.MoveNext(); x509Certificate = en.Current; } st.Close(); //x509Certificate.s return x509Certificate; } </code></pre> This is how I am trying to change CSP parameter. <pre><code>byte[] privateKeyBlob; RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); rsa = cert.PrivateKey as RSACryptoServiceProvider; try { privateKeyBlob = rsa.ExportCspBlob(true); } catch { throw new ApplicationException("Private key fails to export"); } // To use the RSA-SHA256 the CryptoAPI needs to select a special CSP: Microsoft Enhanced RSA and AES Cryptographic Provider // By reinstantiating a CSP of type 24 we ensure that we get the right CSP. CspParameters cp = new CspParameters(24); rsa = new RSACryptoServiceProvider(cp); rsa.ImportCspBlob(privateKeyBlob); signer.SigningKey = rsa; signer.KeyInfo = getKeyInfo(signer, cert); </code></pre> Problem is I am using USB device token and I doubt private key is not exportable. On exporting its throwing an error 'Key not valid for use in specified state.'. Can anybody help how to do this?
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<c#><.net><cryptography><digital-signature><signedxml>
Title
How to change CSP parameter of RSACryptoServiceProvider
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