public void TestSignature(ElipticCurve curve, int iterations)
{
ECKeysGenerator keyGen = new ECKeysGenerator(curve);
ECSignature signature = new ECSignature(curve);
for (int i = 0; i < iterations; i++)
{
Console.WriteLine($"signature curve {curve.Name} test {i}... ");
//generovanie klucoveho paru
byte[] privateKey1;
byte[] publicKey1;
keyGen.GenerateKeyPair(out privateKey1, out publicKey1);
byte[] privateKey2;
byte[] publicKey2;
keyGen.GenerateKeyPair(out privateKey2, out publicKey2);
string str1 = RandomString(random.Next(100));
string str2 = RandomString(random.Next(100));
while (str1 == str2)
{
str2 = RandomString(random.Next(100));
}
byte[] sign1 = signature.Signature(str1, privateKey1);
byte[] sign2 = signature.Signature(str2, privateKey1);
Console.WriteLine(Convert.ToBase64String(sign1));
if (!signature.VerifySignature(str1, sign1, publicKey1))
{
Write($"Signature should be valid !!! ", ConsoleColor.Red);
throw new Exception("Fatal error");
}
if (signature.VerifySignature(str1, sign1, publicKey2))
{
Write($"Signature should not be valid because of wrong public key !!!", ConsoleColor.DarkYellow);
}
if (signature.VerifySignature(str2, sign1, publicKey1))
{
Console.WriteLine();
Write($"Signature should not be valid because of changed message!!!", ConsoleColor.DarkYellow);
}
else
{
Write("OK", ConsoleColor.Green);
}
}
}
public ProtectedSource Get([FromBody] ProtectedSourceRequest request)
{
//read source code
string sourceCode = System.IO.File.ReadAllText(Path.Combine(SOURCE_FILES_DIR, request.FileName));
//generate key pair and derive shared secret
byte[] dhServerPublic;
byte[] dhServerPrivate;
keyGen.GenerateKeyPair(out dhServerPrivate, out dhServerPublic);
byte[] sharedSecret = diffieHelman.SharedSecret(dhServerPrivate, request.DhClientPublic);
//send encrypted and signed source back to client;
//send also servers public key so client can derive common secret
return(new ProtectedSource()
{
SourceCode = AesHandler.EncryptStringToBytes_Aes(sourceCode, sharedSecret),
DhPublicServer = dhServerPublic,
Signature = signatureMaker.Signature(sourceCode, signatureKey)
});
}