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 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
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// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_bridges.hxx"


#ifndef TEST
#ifndef _SAL_TYPES_H_
#include <sal/types.h>
#endif
#else
typedef unsigned int sal_uInt32;
#endif

#include <string.h>

/*
 *	build a hash for a character buffer using the NIST algorithm
 */

class NIST_Hash
{

	// helper functions
	sal_uInt32 f1( sal_uInt32 x, sal_uInt32 y, sal_uInt32 z )
	{
		return z ^ ( x & ( y ^ z ) );
	}
	
	sal_uInt32 f2( sal_uInt32 x, sal_uInt32 y, sal_uInt32 z )
	{
		return x ^ y ^ z;
	}
	
	sal_uInt32 f3( sal_uInt32 x, sal_uInt32 y, sal_uInt32 z )
	{
		return ( x & y ) + ( z & ( x ^ y ) );
	}

	sal_uInt32 rotl( sal_uInt32 nValue, sal_uInt32 nBits )
	{
		return ( nValue << nBits ) | ( nValue >> (32-nBits) );
	}

	sal_uInt32 expand_nostore( sal_uInt32 index )
	{
		return data[index&15] ^ data[(index-14)&15] ^ data[(index-8)&15] ^ data[(index-3)&15];
	}

	sal_uInt32 expand_store( sal_uInt32 index )
	{
		return data[index&15] ^= data[(index-14)&15] ^ data[(index-8)&15] ^ data[(index-3)&15];
	}

	void subRound( sal_uInt32 a, sal_uInt32& b, sal_uInt32 c, sal_uInt32 d, sal_uInt32& e, sal_uInt32 constant, sal_uInt32 datum, sal_uInt32 nFunction )
	{
		e += rotl(a,5);
		switch( nFunction )
		{
			case 1: e += f1( b, c, d );break;
			case 2:
			case 4: e += f2( b, c, d );break;
			case 3: e += f3( b, c, d );break;
		}
		e += constant + datum;
		b = rotl( b, 30 );
	}

	void transform();
	void final();

	// data members
	sal_uInt32 data[16];
	sal_uInt32 hashdata[5];
public:
	NIST_Hash( const char* pString, sal_uInt32 nLen );
	
	sal_uInt32 *getHash() { return hashdata; }
};

void NIST_Hash::transform()
{
	// constants
	const sal_uInt32 K2		= 0x5A827999;
	const sal_uInt32 K3		= 0x6ED9EBA1;
	const sal_uInt32 K5		= 0x8F1BBCDC;
	const sal_uInt32 K10	= 0xCA62C1D6;

	sal_uInt32 a, b, c, d, e;
	a = hashdata[0];
	b = hashdata[1];
	c = hashdata[2];
	d = hashdata[3];
	e = hashdata[4];

	subRound( a, b, c, d, e, K2, data[ 0], 1 );
	subRound( e, a, b, c, d, K2, data[ 1], 1 );
	subRound( d, e, a, b, c, K2, data[ 2], 1 );
	subRound( c, d, e, a, b, K2, data[ 3], 1 );
	subRound( b, c, d, e, a, K2, data[ 4], 1 );
	subRound( a, b, c, d, e, K2, data[ 5], 1 );
	subRound( e, a, b, c, d, K2, data[ 6], 1 );
	subRound( d, e, a, b, c, K2, data[ 7], 1 );
	subRound( c, d, e, a, b, K2, data[ 8], 1 );
	subRound( b, c, d, e, a, K2, data[ 9], 1 );
	subRound( a, b, c, d, e, K2, data[10], 1 );
	subRound( e, a, b, c, d, K2, data[11], 1 );
	subRound( d, e, a, b, c, K2, data[12], 1 );
	subRound( c, d, e, a, b, K2, data[13], 1 );
	subRound( b, c, d, e, a, K2, data[14], 1 );
	subRound( a, b, c, d, e, K2, data[15], 1 );
	subRound( e, a, b, c, d, K2, expand_store( 16 ), 1 );
	subRound( d, e, a, b, c, K2, expand_store( 17 ), 1 );
	subRound( c, d, e, a, b, K2, expand_store( 18 ), 1 );
	subRound( b, c, d, e, a, K2, expand_store( 19 ), 1 );

	subRound( a, b, c, d, e, K3, expand_store( 20 ), 2 );
	subRound( e, a, b, c, d, K3, expand_store( 21 ), 2 );
	subRound( d, e, a, b, c, K3, expand_store( 22 ), 2 );
	subRound( c, d, e, a, b, K3, expand_store( 23 ), 2 );
	subRound( b, c, d, e, a, K3, expand_store( 24 ), 2 );
	subRound( a, b, c, d, e, K3, expand_store( 25 ), 2 );
	subRound( e, a, b, c, d, K3, expand_store( 26 ), 2 );
	subRound( d, e, a, b, c, K3, expand_store( 27 ), 2 );
	subRound( c, d, e, a, b, K3, expand_store( 28 ), 2 );
	subRound( b, c, d, e, a, K3, expand_store( 29 ), 2 );
	subRound( a, b, c, d, e, K3, expand_store( 30 ), 2 );
	subRound( e, a, b, c, d, K3, expand_store( 31 ), 2 );
	subRound( d, e, a, b, c, K3, expand_store( 32 ), 2 );
	subRound( c, d, e, a, b, K3, expand_store( 33 ), 2 );
	subRound( b, c, d, e, a, K3, expand_store( 34 ), 2 );
	subRound( a, b, c, d, e, K3, expand_store( 35 ), 2 );
	subRound( e, a, b, c, d, K3, expand_store( 36 ), 2 );
	subRound( d, e, a, b, c, K3, expand_store( 37 ), 2 );
	subRound( c, d, e, a, b, K3, expand_store( 38 ), 2 );
	subRound( b, c, d, e, a, K3, expand_store( 39 ), 2 );

	subRound( a, b, c, d, e, K5, expand_store( 40 ), 3 );
	subRound( e, a, b, c, d, K5, expand_store( 41 ), 3 );
	subRound( d, e, a, b, c, K5, expand_store( 42 ), 3 );
	subRound( c, d, e, a, b, K5, expand_store( 43 ), 3 );
	subRound( b, c, d, e, a, K5, expand_store( 44 ), 3 );
	subRound( a, b, c, d, e, K5, expand_store( 45 ), 3 );
	subRound( e, a, b, c, d, K5, expand_store( 46 ), 3 );
	subRound( d, e, a, b, c, K5, expand_store( 47 ), 3 );
	subRound( c, d, e, a, b, K5, expand_store( 48 ), 3 );
	subRound( b, c, d, e, a, K5, expand_store( 49 ), 3 );
	subRound( a, b, c, d, e, K5, expand_store( 50 ), 3 );
	subRound( e, a, b, c, d, K5, expand_store( 51 ), 3 );
	subRound( d, e, a, b, c, K5, expand_store( 52 ), 3 );
	subRound( c, d, e, a, b, K5, expand_store( 53 ), 3 );
	subRound( b, c, d, e, a, K5, expand_store( 54 ), 3 );
	subRound( a, b, c, d, e, K5, expand_store( 55 ), 3 );
	subRound( e, a, b, c, d, K5, expand_store( 56 ), 3 );
	subRound( d, e, a, b, c, K5, expand_store( 57 ), 3 );
	subRound( c, d, e, a, b, K5, expand_store( 58 ), 3 );
	subRound( b, c, d, e, a, K5, expand_store( 59 ), 3 );

	subRound( a, b, c, d, e, K10, expand_store( 60 ), 4 );
	subRound( e, a, b, c, d, K10, expand_store( 61 ), 4 );
	subRound( d, e, a, b, c, K10, expand_store( 62 ), 4 );
	subRound( c, d, e, a, b, K10, expand_store( 63 ), 4 );
	subRound( b, c, d, e, a, K10, expand_store( 64 ), 4 );
	subRound( a, b, c, d, e, K10, expand_store( 65 ), 4 );
	subRound( e, a, b, c, d, K10, expand_store( 66 ), 4 );
	subRound( d, e, a, b, c, K10, expand_store( 67 ), 4 );
	subRound( c, d, e, a, b, K10, expand_store( 68 ), 4 );
	subRound( b, c, d, e, a, K10, expand_store( 69 ), 4 );
	subRound( a, b, c, d, e, K10, expand_store( 70 ), 4 );
	subRound( e, a, b, c, d, K10, expand_store( 71 ), 4 );
	subRound( d, e, a, b, c, K10, expand_store( 72 ), 4 );
	subRound( c, d, e, a, b, K10, expand_store( 73 ), 4 );
	subRound( b, c, d, e, a, K10, expand_store( 74 ), 4 );
	subRound( a, b, c, d, e, K10, expand_store( 75 ), 4 );
	subRound( e, a, b, c, d, K10, expand_store( 76 ), 4 );
	subRound( d, e, a, b, c, K10, expand_nostore( 77 ), 4 );
	subRound( c, d, e, a, b, K10, expand_nostore( 78 ), 4 );
	subRound( b, c, d, e, a, K10, expand_nostore( 79 ), 4 );

	hashdata[0] += a;
	hashdata[1] += b;
	hashdata[2] += c;
	hashdata[3] += d;
	hashdata[4] += e;
}

#define BLOCKSIZE sizeof( data )

NIST_Hash::NIST_Hash( const char* pString, sal_uInt32 nLen ) 
{
	hashdata[0] = 0x67452301;
	hashdata[1] = 0xefcdab89;
	hashdata[2] = 0x98badcfe;
	hashdata[3] = 0x10325476;
	hashdata[4] = 0xc3d2e1f0;

	sal_uInt32 nBytes = nLen;

	while( nLen >= sizeof( data ) )
	{
		memcpy( data, pString, sizeof( data ) );
		pString += sizeof( data );
		nLen -= sizeof( data );
		transform();
	}
	memcpy( data, pString, nLen );
	((char*)data)[nLen++] = 0x80;
	if( nLen > sizeof( data ) - 8 )
	{
		memset( ((char*)data)+nLen, 0, sizeof( data ) - nLen );
		transform();
		memset( data, 0, sizeof( data ) - 8 );
	}
	else
		memset( ((char*)data)+nLen, 0, sizeof( data ) - 8 - nLen );
	data[14] = 0;
	data[15] = nBytes << 3;
	transform();
}

#ifdef TEST
#include <stdio.h>
int main( int argc, const char** argv )
{
	const char* pHash = argc < 2 ? argv[0] : argv[1];

	NIST_Hash aHash( pHash, strlen( pHash ) );
	sal_uInt32* pBits = aHash.getHash();

	printf( "text : %s\n"
			"bits : 0x%.8x 0x%.8x 0x%.8x 0x%.8x 0x%.8x\n",
			pHash,
			pBits[0], pBits[1], pBits[2],pBits[3],pBits[4]
			);
	return 0;
}

#endif