public void TestSignAndVerifyHash() { byte[] data = new byte[100]; new Random().NextBytes(data); foreach (HashAlgorithm ha in new HashAlgorithm[] { MD5.Create(), SHA1.Create(), SHA256.Create(), SHA384.Create(), SHA512.Create() }) { Hash hash = Hash.FromBytes(ha.ComputeHash(data)); Assert.AreEqual(CryptoConfig.MapNameToOID(ha.GetType().FullName), hash.AlgorithmOID); using (RSAPrivateKey key = new RSAPrivateKey()) { byte[] sig = key.SignHash(hash); using (RSAPublicKey pub = key.PublicKey) { Assert.IsTrue(pub.VerifyHash(sig, Hash.FromBytes(ha.ComputeHash(data)))); data[0] = (byte)~data[0]; Assert.IsFalse(pub.VerifyHash(sig, Hash.FromBytes(ha.ComputeHash(data)))); } } } }