} // End Function GenerateElGamalKeyPair
public static Org.BouncyCastle.Crypto.AsymmetricCipherKeyPair GenerateDHKeyPair(
int length
, Org.BouncyCastle.Security.SecureRandom secureRandom
)
{
// Org.BouncyCastle.Math.BigInteger p = new BigInteger("123", 10);
// Org.BouncyCastle.Math.BigInteger g = new BigInteger("456", 10);
// Org.BouncyCastle.Crypto.Parameters.DHParameters dhParams =
// new Org.BouncyCastle.Crypto.Parameters.DHParameters(p, g);
Org.BouncyCastle.Crypto.Generators.DHParametersGenerator pg =
new Org.BouncyCastle.Crypto.Generators.DHParametersGenerator();
pg.Init(length, 100, secureRandom);
Org.BouncyCastle.Crypto.Parameters.DHParameters dhp = pg.GenerateParameters();
Org.BouncyCastle.Crypto.Parameters.DHKeyGenerationParameters pars =
new Org.BouncyCastle.Crypto.Parameters.DHKeyGenerationParameters(secureRandom, dhp);
Org.BouncyCastle.Crypto.Generators.DHKeyPairGenerator keyGenerator =
new Org.BouncyCastle.Crypto.Generators.DHKeyPairGenerator();
keyGenerator.Init(pars);
return(keyGenerator.GenerateKeyPair());
} // End Function GenerateDHKeyPair
// https://stackoverflow.com/questions/33813108/bouncycastle-diffie-hellman
public static Org.BouncyCastle.Crypto.AsymmetricCipherKeyPair GenerateDiffieHellmanKeyPair(Org.BouncyCastle.Security.SecureRandom random
, int keystrength
)
{
const int DefaultPrimeProbability = 30;
Org.BouncyCastle.Crypto.IAsymmetricCipherKeyPairGenerator keypairGen = new Org.BouncyCastle.Crypto.Generators.DHKeyPairGenerator();
Org.BouncyCastle.Crypto.Generators.DHParametersGenerator pGen = new Org.BouncyCastle.Crypto.Generators.DHParametersGenerator();
pGen.Init(keystrength, DefaultPrimeProbability, random);
Org.BouncyCastle.Crypto.Parameters.DHParameters parameters = pGen.GenerateParameters();
Org.BouncyCastle.Crypto.KeyGenerationParameters genParam = new Org.BouncyCastle.Crypto.Parameters.DHKeyGenerationParameters(new Org.BouncyCastle.Security.SecureRandom(), parameters);
keypairGen.Init(genParam);
Org.BouncyCastle.Crypto.AsymmetricCipherKeyPair kp = keypairGen.GenerateKeyPair();
return(kp);
}
