// Create a signature deformatter for DSA decryption.
public static AsymmetricSignatureDeformatter CreateDSADeformatter(DSA dsa)
{
// Create a DSA signature deformatter to verify the signature.
SignatureDescription signatureDescription = new SignatureDescription();
signatureDescription.DeformatterAlgorithm = "System.Security.Cryptography.DSASignatureDeformatter";
AsymmetricSignatureDeformatter asymmetricDeformatter = signatureDescription.CreateDeformatter(dsa);
Console.WriteLine("\nCreated deformatter : " + asymmetricDeformatter.ToString());
return(asymmetricDeformatter);
}
public void DSASignatureDescription()
{
// internal class - we cannot create one without CryptoConfig
SignatureDescription sd = (SignatureDescription)CryptoConfig.CreateFromName("http://www.w3.org/2000/09/xmldsig#dsa-sha1");
Assert.AreEqual("System.Security.Cryptography.SHA1CryptoServiceProvider", sd.DigestAlgorithm);
Assert.AreEqual("System.Security.Cryptography.DSASignatureDeformatter", sd.DeformatterAlgorithm);
Assert.AreEqual("System.Security.Cryptography.DSASignatureFormatter", sd.FormatterAlgorithm);
Assert.AreEqual("System.Security.Cryptography.DSACryptoServiceProvider", sd.KeyAlgorithm);
HashAlgorithm hash = sd.CreateDigest();
Assert.AreEqual("System.Security.Cryptography.SHA1CryptoServiceProvider", hash.ToString());
Assert.AreEqual(dsa.ToString(), sd.KeyAlgorithm);
AsymmetricSignatureDeformatter asd = sd.CreateDeformatter(dsa);
Assert.AreEqual("System.Security.Cryptography.DSASignatureDeformatter", asd.ToString());
AsymmetricSignatureFormatter asf = sd.CreateFormatter(dsa);
Assert.AreEqual("System.Security.Cryptography.DSASignatureFormatter", asf.ToString());
}
void RSASignatureDescriptionCore(string name, string expectedDigestAlgorithm, string expectedSelectedDigestAlgorithm)
{
// internal class - we cannot create one without CryptoConfig
SignatureDescription sd = (SignatureDescription)CryptoConfig.CreateFromName(name);
Assert.AreEqual(expectedDigestAlgorithm, sd.DigestAlgorithm);
Assert.AreEqual("System.Security.Cryptography.RSAPKCS1SignatureDeformatter", sd.DeformatterAlgorithm);
Assert.AreEqual("System.Security.Cryptography.RSAPKCS1SignatureFormatter", sd.FormatterAlgorithm);
Assert.AreEqual("System.Security.Cryptography.RSA", sd.KeyAlgorithm);
HashAlgorithm hash = sd.CreateDigest();
Assert.AreEqual(expectedSelectedDigestAlgorithm, hash.ToString());
Assert.AreEqual("System.Security.Cryptography.RSA", sd.KeyAlgorithm);
AsymmetricSignatureDeformatter asd = sd.CreateDeformatter(rsa);
Assert.AreEqual("System.Security.Cryptography.RSAPKCS1SignatureDeformatter", asd.ToString());
AsymmetricSignatureFormatter asf = sd.CreateFormatter(rsa);
Assert.AreEqual("System.Security.Cryptography.RSAPKCS1SignatureFormatter", asf.ToString());
}
