static PbeParametersGenerator MakePbeGenerator(
string type,
IDigest digest,
byte[] key,
byte[] salt,
int iterationCount)
{
PbeParametersGenerator generator;
if (type.Equals(Pkcs5S1))
{
generator = new Pkcs5S1ParametersGenerator(digest);
}
else if (type.Equals(Pkcs5S2))
{
generator = new Pkcs5S2ParametersGenerator();
}
else if (type.Equals(Pkcs12))
{
generator = new Pkcs12ParametersGenerator(digest);
}
else if (type.Equals(OpenSsl))
{
generator = new OpenSslPbeParametersGenerator();
}
else
{
throw new ArgumentException("Unknown PBE type: " + type, "type");
}
generator.Init(key, salt, iterationCount);
return generator;
}
private static byte[] SingleIterationPBKDF2(byte[] P, byte[] S, int dkLen)
{
PbeParametersGenerator pGen = new Pkcs5S2ParametersGenerator(new Sha256Digest());
pGen.Init(P, S, 1);
KeyParameter key = (KeyParameter)pGen.GenerateDerivedMacParameters(dkLen * 8);
return key.GetKey();
}