public static void RunECDHE(int iterations)
{
Console.WriteLine("Running " + iterations + " diffie hellman key exchanges");
Stopwatch watch = new Stopwatch();
for (int i = 0; i < iterations; i++)
{
watch.Start();
// Both create their instances
ECDiffieHellman serverDiffie = new ECDiffieHellman();
ECDiffieHellman clientDiffie = new ECDiffieHellman();
// Exchange publics
/* START TRANSMISSION */
byte[] serverPublic = serverDiffie.GetPublicKey();
byte[] clientPublic = clientDiffie.GetPublicKey();
/* END TRANSMISSION */
// Calculate shared
byte[] key1 = serverDiffie.GetSharedSecretRaw(clientPublic);
byte[] key2 = clientDiffie.GetSharedSecretRaw(serverPublic);
watch.Stop();
if (key1.Length != key2.Length)
{
Console.WriteLine("CRITICAL: LENGTH MISSMATCH");
continue;
}
for (int x = 0; x < key1.Length; x++)
{
if (key1[x] != key2[x])
{
Console.WriteLine("CRITICAL: MISSMATCH");
break;
}
}
}
Console.WriteLine("Completed in " + watch.ElapsedMilliseconds + " ms, " + (watch.ElapsedMilliseconds / iterations) + " ms per exchange");
}
public byte[] GetSecurePublicPart()
{
byte[] publicPart = _diffieHellanInstance.GetPublicKey();
using (SHA256Managed sha = new SHA256Managed())
{
byte[] proofPart;
if (_isSigner)
{
// Sign the hash with the private key
proofPart = _rsa.SignData(publicPart, sha);
}
else
{
// Encrypt the public part with the opposite public
proofPart = _rsa.Encrypt(sha.ComputeHash(publicPart), false);
}
// Final has two lengths appended
byte[] final = new byte[(sizeof(ushort) * 2) + publicPart.Length + proofPart.Length];
// Write lengths to final
for (byte i = 0; i < sizeof(ushort); i++)
{
final[i] = ((byte)(publicPart.Length >> (i * 8)));
}
for (byte i = 0; i < sizeof(ushort); i++)
{
final[i + sizeof(ushort)] = ((byte)(proofPart.Length >> (i * 8)));
}
// Copy parts
Buffer.BlockCopy(publicPart, 0, final, (sizeof(ushort) * 2), publicPart.Length);
Buffer.BlockCopy(proofPart, 0, final, (sizeof(ushort) * 2) + publicPart.Length, proofPart.Length);
return(final);
}
}