public void RSAPKCS1SHA256RoundTripTest()
{
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(2048))
{
RSAPKCS1SHA256SignatureDescription sd = new RSAPKCS1SHA256SignatureDescription();
using (HashAlgorithm digestAlgorithm = sd.CreateDigest())
{
// Create some data to sign
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
byte[] data = new byte[1025];
rng.GetBytes(data);
byte[] hash = digestAlgorithm.ComputeHash(data);
// Sign the data
AsymmetricSignatureFormatter formatter = sd.CreateFormatter(rsa);
byte[] signature = formatter.CreateSignature(hash);
Assert.IsNotNull(signature, "Failed to create a signature");
// Verify the signature
AsymmetricSignatureDeformatter deformatter = sd.CreateDeformatter(rsa);
Assert.IsTrue(deformatter.VerifySignature(hash, signature), "Failed to verify signature");
}
}
}
public void RSAPKCS1SHA256SignatureCreateTest()
{
RSAPKCS1SHA256SignatureDescription sd = new RSAPKCS1SHA256SignatureDescription();
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
// We should be using the PKCS1 signature deformatter
AsymmetricSignatureDeformatter deformatter = sd.CreateDeformatter(rsa);
Assert.IsInstanceOfType(deformatter, typeof(RSAPKCS1SignatureDeformatter));
// We should be using the PKCS1 signature formatter
AsymmetricSignatureFormatter formatter = sd.CreateFormatter(rsa);
Assert.IsInstanceOfType(formatter, typeof(RSAPKCS1SignatureFormatter));
}
// We should be using SHA256Managed for hashing
using (HashAlgorithm digestAlgorithm = sd.CreateDigest())
{
Assert.IsInstanceOfType(digestAlgorithm, typeof(SHA256Managed));
}
}