BasicAgreementWithKdf
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Crypto.Agreement.Kdf;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities;
using System;
using Org.BouncyCastle.Math;
using System;
namespace Org.BouncyCastle.Crypto.Agreement
{
internal static class BasicAgreementWithKdf
{
internal static BigInteger CalculateAgreementWithKdf(string algorithm, IDerivationFunction kdf, int fieldSize, BigInteger result)
{
int defaultKeySize = GeneratorUtilities.GetDefaultKeySize(algorithm);
DHKdfParameters parameters = new DHKdfParameters(new DerObjectIdentifier(algorithm), defaultKeySize, BigIntegers.AsUnsignedByteArray(fieldSize, result));
kdf.Init(parameters);
byte[] array = new byte[defaultKeySize / 8];
kdf.GenerateBytes(array, 0, array.Length);
return new BigInteger(1, array);
}
}
}
namespace Org.BouncyCastle.Crypto.Agreement
{
public class ECMqvWithKdfBasicAgreement : ECMqvBasicAgreement
{
private readonly string m_algorithm;
private readonly IDerivationFunction m_kdf;
public ECMqvWithKdfBasicAgreement(string algorithm, IDerivationFunction kdf)
{
if (algorithm == null)
throw new ArgumentNullException("algorithm");
m_algorithm = algorithm;
if (kdf == null)
throw new ArgumentNullException("kdf");
m_kdf = kdf;
}
public override BigInteger CalculateAgreement(ICipherParameters pubKey)
{
BigInteger result = base.CalculateAgreement(pubKey);
BigInteger result;
return BasicAgreementWithKdf.CalculateAgreementWithKdf(m_algorithm, m_kdf, GetFieldSize(), result);
}
}
}