/*
 Derived from source code of TrueCrypt 7.1a, which is
 Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed
 by the TrueCrypt License 3.0.

 Modifications and additions to the original source code (contained in this file)
 and all other portions of this file are Copyright (c) 2013-2016 IDRIX
 and are governed by the Apache License 2.0 the full text of which is
 contained in the file License.txt included in VeraCrypt binary and source
 code distribution packages.
*/

#include "Common/Pkcs5.h"
#include "Pkcs5Kdf.h"
#include "VolumePassword.h"

namespace VeraCrypt
{
	Pkcs5Kdf::Pkcs5Kdf (bool truecryptMode) : m_truecryptMode(truecryptMode)
	{
	}

	Pkcs5Kdf::~Pkcs5Kdf ()
	{
	}

	void Pkcs5Kdf::DeriveKey (const BufferPtr &key, const VolumePassword &password, int pim, const ConstBufferPtr &salt) const
	{
		DeriveKey (key, password, salt, GetIterationCount(pim));
	}

	shared_ptr <Pkcs5Kdf> Pkcs5Kdf::GetAlgorithm (const wstring &name, bool truecryptMode)
	{
		foreach (shared_ptr <Pkcs5Kdf> kdf, GetAvailableAlgorithms(truecryptMode))
		{
			if (kdf->GetName() == name)
				return kdf;
		}
		throw ParameterIncorrect (SRC_POS);
	}

	shared_ptr <Pkcs5Kdf> Pkcs5Kdf::GetAlgorithm (const Hash &hash, bool truecryptMode)
	{
		foreach (shared_ptr <Pkcs5Kdf> kdf, GetAvailableAlgorithms(truecryptMode))
		{
			if (typeid (*kdf->GetHash()) == typeid (hash))
				return kdf;
		}

		throw ParameterIncorrect (SRC_POS);
	}

	Pkcs5KdfList Pkcs5Kdf::GetAvailableAlgorithms (bool truecryptMode)
	{
		Pkcs5KdfList l;

		if (truecryptMode)
		{
			l.push_back (shared_ptr <Pkcs5Kdf> (new Pkcs5HmacRipemd160 (true)));
			l.push_back (shared_ptr <Pkcs5Kdf> (new Pkcs5HmacSha512 (true)));
			l.push_back (shared_ptr <Pkcs5Kdf> (new Pkcs5HmacWhirlpool (true)));
		}
		else
		{
			l.push_back (shared_ptr <Pkcs5Kdf> (new Pkcs5HmacSha512 (false)));
			l.push_back (shared_ptr <Pkcs5Kdf> (new Pkcs5HmacWhirlpool (false)));
			l.push_back (shared_ptr <Pkcs5Kdf> (new Pkcs5HmacSha256 ()));
			l.push_back (shared_ptr <Pkcs5Kdf> (new Pkcs5HmacRipemd160 (false)));
		}

		return l;
	}

	void Pkcs5Kdf::ValidateParameters (const BufferPtr &key, const VolumePassword &password, const ConstBufferPtr &salt, int iterationCount) const
	{
		if (key.Size() < 1 || password.Size() < 1 || salt.Size() < 1 || iterationCount < 1)
			throw ParameterIncorrect (SRC_POS);
	}

	void Pkcs5HmacRipemd160::DeriveKey (const BufferPtr &key, const VolumePassword &password, const ConstBufferPtr &salt, int iterationCount) const
	{
		ValidateParameters (key, password, salt, iterationCount);
		derive_key_ripemd160 ((char *) password.DataPtr(), (int) password.Size(), (char *) salt.Get(), (int) salt.Size(), iterationCount, (char *) key.Get(), (int) key.Size());
	}

	void Pkcs5HmacRipemd160_1000::DeriveKey (const BufferPtr &key, const VolumePassword &password, const ConstBufferPtr &salt, int iterationCount) const
	{
		ValidateParameters (key, password, salt, iterationCount);
		derive_key_ripemd160 ((char *) password.DataPtr(), (int) password.Size(), (char *) salt.Get(), (int) salt.Size(), iterationCount, (char *) key.Get(), (int) key.Size());
	}

	void Pkcs5HmacSha256_Boot::DeriveKey (const BufferPtr &key, const VolumePassword &password, const ConstBufferPtr &salt, int iterationCount) const
	{
		ValidateParameters (key, password, salt, iterationCount);
		derive_key_sha256 ((char *) password.DataPtr(), (int) password.Size(), (char *) salt.Get(), (int) salt.Size(), iterationCount, (char *) key.Get(), (int) key.Size());
	}

	void Pkcs5HmacSha256::DeriveKey (const BufferPtr &key, const VolumePassword &password, const ConstBufferPtr &salt, int iterationCount) const
	{
		ValidateParameters (key, password, salt, iterationCount);
		derive_key_sha256 ((char *) password.DataPtr(), (int) password.Size(), (char *) salt.Get(), (int) salt.Size(), iterationCount, (char *) key.Get(), (int) key.Size());
	}

	void Pkcs5HmacSha512::DeriveKey (const BufferPtr &key, const VolumePassword &password, const ConstBufferPtr &salt, int iterationCount) const
	{
		ValidateParameters (key, password, salt, iterationCount);
		derive_key_sha512 ((char *) password.DataPtr(), (int) password.Size(), (char *) salt.Get(), (int) salt.Size(), iterationCount, (char *) key.Get(), (int) key.Size());
	}

	void Pkcs5HmacWhirlpool::DeriveKey (const BufferPtr &key, const VolumePassword &password, const ConstBufferPtr &salt, int iterationCount) const
	{
		ValidateParameters (key, password, salt, iterationCount);
		derive_key_whirlpool ((char *) password.DataPtr(), (int) password.Size(), (char *) salt.Get(), (int) salt.Size(), iterationCount, (char *) key.Get(), (int) key.Size());
	}
}