/*
 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) 2013-2015 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 "Hash.h"

#include "Crypto/Rmd160.h"
#include "Crypto/Sha2.h"
#include "Crypto/Whirlpool.h"

namespace VeraCrypt
{
	HashList Hash::GetAvailableAlgorithms ()
	{
		HashList l;
		
		l.push_back (shared_ptr <Hash> (new Sha512 ()));
		l.push_back (shared_ptr <Hash> (new Whirlpool ()));
		l.push_back (shared_ptr <Hash> (new Sha256 ()));
		l.push_back (shared_ptr <Hash> (new Ripemd160 ()));

		return l;
	}

	void Hash::ValidateDataParameters (const ConstBufferPtr &data) const
	{
		if (data.Size() < 1)
			throw ParameterIncorrect (SRC_POS);
	}

	void Hash::ValidateDigestParameters (const BufferPtr &buffer) const
	{
		if (buffer.Size() != GetDigestSize ())
			throw ParameterIncorrect (SRC_POS);
	}

	// RIPEMD-160
	Ripemd160::Ripemd160 ()
	{
		Deprecated = true; // Mark RIPEMD-160 as deprecated like on Windows.
		Context.Allocate (sizeof (RMD160_CTX));
		Init();
	}

	void Ripemd160::GetDigest (const BufferPtr &buffer)
	{
		if_debug (ValidateDigestParameters (buffer));
		RMD160Final (buffer, (RMD160_CTX *) Context.Ptr());
	}

	void Ripemd160::Init ()
	{
		RMD160Init ((RMD160_CTX *) Context.Ptr());
	}

	void Ripemd160::ProcessData (const ConstBufferPtr &data)
	{
		if_debug (ValidateDataParameters (data));
		RMD160Update ((RMD160_CTX *) Context.Ptr(), data.Get(), (int) data.Size());
	}
	
	// SHA-256
	Sha256::Sha256 ()
	{
		Context.Allocate (sizeof (sha256_ctx));
		Init();
	}

	void Sha256::GetDigest (const BufferPtr &buffer)
	{
		if_debug (ValidateDigestParameters (buffer));
		sha256_end (buffer, (sha256_ctx *) Context.Ptr());
	}

	void Sha256::Init ()
	{
		sha256_begin ((sha256_ctx *) Context.Ptr());
	}

	void Sha256::ProcessData (const ConstBufferPtr &data)
	{
		if_debug (ValidateDataParameters (data));
		sha256_hash (data.Get(), (int) data.Size(), (sha256_ctx *) Context.Ptr());
	}

	// SHA-512
	Sha512::Sha512 ()
	{
		Context.Allocate (sizeof (sha512_ctx));
		Init();
	}

	void Sha512::GetDigest (const BufferPtr &buffer)
	{
		if_debug (ValidateDigestParameters (buffer));
		sha512_end (buffer, (sha512_ctx *) Context.Ptr());
	}

	void Sha512::Init ()
	{
		sha512_begin ((sha512_ctx *) Context.Ptr());
	}

	void Sha512::ProcessData (const ConstBufferPtr &data)
	{
		if_debug (ValidateDataParameters (data));
		sha512_hash (data.Get(), (int) data.Size(), (sha512_ctx *) Context.Ptr());
	}

	// Whirlpool
	Whirlpool::Whirlpool ()
	{
		Context.Allocate (sizeof (WHIRLPOOL_CTX));
		Init();
	}

	void Whirlpool::GetDigest (const BufferPtr &buffer)
	{
		if_debug (ValidateDigestParameters (buffer));
		WHIRLPOOL_finalize ((WHIRLPOOL_CTX *) Context.Ptr(), buffer);
	}

	void Whirlpool::Init ()
	{
		WHIRLPOOL_init ((WHIRLPOOL_CTX *) Context.Ptr());
	}

	void Whirlpool::ProcessData (const ConstBufferPtr &data)
	{
		if_debug (ValidateDataParameters (data));
		WHIRLPOOL_add (data.Get(), (int) data.Size() * 8, (WHIRLPOOL_CTX *) Context.Ptr());
	}
}