public void GeneratesSameSharedKey()
{
byte[] serverSharedSecret;
byte[] clientSharedSecret;
using (X25519EcdheRsaSha256 serverCipherSuite = new X25519EcdheRsaSha256(this.random))
{
int expectedSize = serverCipherSuite.CalculateServerMessageSize(this.privateKey);
Assert.IsTrue(expectedSize > 0);
byte[] serverKeyExchangeMessage = new byte[expectedSize];
serverCipherSuite.EncodeServerKeyExchangeMessage(serverKeyExchangeMessage, this.privateKey);
byte[] clientKeyExchange;
using (X25519EcdheRsaSha256 clientCipherSuite = new X25519EcdheRsaSha256(this.random))
{
clientSharedSecret = new byte[clientCipherSuite.SharedKeySize()];
Assert.IsTrue(clientCipherSuite.VerifyServerMessageAndGenerateSharedKey(clientSharedSecret, serverKeyExchangeMessage, this.publicKey));
clientKeyExchange = new byte[clientCipherSuite.CalculateClientMessageSize()];
clientCipherSuite.EncodeClientKeyExchangeMessage(clientKeyExchange);
}
serverSharedSecret = new byte[serverCipherSuite.SharedKeySize()];
Assert.IsTrue(serverCipherSuite.VerifyClientMessageAndGenerateSharedKey(serverSharedSecret, clientKeyExchange));
}
CollectionAssert.AreEqual(serverSharedSecret, clientSharedSecret);
}
public void VerifySignature()
{
byte[] data;
using (X25519EcdheRsaSha256 cipherSuite = new X25519EcdheRsaSha256(this.random))
{
int expectedSize = cipherSuite.CalculateServerMessageSize(this.privateKey);
Assert.IsTrue(expectedSize > 0);
data = new byte[expectedSize];
cipherSuite.EncodeServerKeyExchangeMessage(data, this.privateKey);
}
using (X25519EcdheRsaSha256 cipherSuite = new X25519EcdheRsaSha256(this.random))
{
byte[] sharedKey = new byte[cipherSuite.SharedKeySize()];
Assert.IsTrue(cipherSuite.VerifyServerMessageAndGenerateSharedKey(sharedKey, data, this.publicKey));
}
}
public void RandomSignatureFails()
{
byte[] data;
using (X25519EcdheRsaSha256 cipherSuite = new X25519EcdheRsaSha256(this.random))
{
int expectedSize = cipherSuite.CalculateServerMessageSize(this.privateKey);
Assert.IsTrue(expectedSize > 0);
data = new byte[expectedSize];
cipherSuite.EncodeServerKeyExchangeMessage(data, this.privateKey);
}
// overwrite signature with random data
byte[] randomSignature = new byte[this.privateKey.KeySize / 8];
random.GetBytes(randomSignature);
new ByteSpan(randomSignature).CopyTo(new ByteSpan(data, data.Length - randomSignature.Length, randomSignature.Length));
using (X25519EcdheRsaSha256 cipherSuite = new X25519EcdheRsaSha256(this.random))
{
byte[] sharedKey = new byte[cipherSuite.SharedKeySize()];
Assert.IsFalse(cipherSuite.VerifyServerMessageAndGenerateSharedKey(sharedKey, data, this.publicKey));
}
}