public virtual void Init(IDerivationParameters param)
{
DHKdfParameters dHKdfParameters = (DHKdfParameters)param;
algorithm = dHKdfParameters.Algorithm;
keySize = dHKdfParameters.KeySize;
z = dHKdfParameters.GetZ();
}
public override BigInteger CalculateAgreement(ICipherParameters pubKey)
{
BigInteger r = base.CalculateAgreement(pubKey);
int defaultKeySize = GeneratorUtilities.GetDefaultKeySize(algorithm);
DHKdfParameters parameters = new DHKdfParameters(new DerObjectIdentifier(algorithm), defaultKeySize, BigIntToBytes(r));
kdf.Init(parameters);
byte[] array = new byte[defaultKeySize / 8];
kdf.GenerateBytes(array, 0, array.Length);
return(new BigInteger(1, array));
}
public override BigInteger CalculateAgreement(
ICipherParameters pubKey)
{
BigInteger result = base.CalculateAgreement(pubKey);
int keySize = (int)algorithms[algorithm];
DHKdfParameters dhKdfParams = new DHKdfParameters(
new DerObjectIdentifier(algorithm), keySize, result.ToByteArrayUnsigned());
kdf.Init(dhKdfParams);
byte[] keyBytes = new byte[keySize / 8];
kdf.GenerateBytes(keyBytes, 0, keyBytes.Length);
return(new BigInteger(1, keyBytes));
}
public override BigInteger CalculateAgreement(
ICipherParameters pubKey)
{
// Note that the ec.KeyAgreement class in JCE only uses kdf in one
// of the engineGenerateSecret methods.
BigInteger result = base.CalculateAgreement(pubKey);
int keySize = GeneratorUtilities.GetDefaultKeySize(algorithm);
DHKdfParameters dhKdfParams = new DHKdfParameters(
new DerObjectIdentifier(algorithm),
keySize,
BigIntToBytes(result));
kdf.Init(dhKdfParams);
byte[] keyBytes = new byte[keySize / 8];
kdf.GenerateBytes(keyBytes, 0, keyBytes.Length);
return(new BigInteger(1, keyBytes));
}
