/*
* blake256 kernel implementation.
*
* ==========================(LICENSE BEGIN)============================
* Copyright (c) 2014 djm34
* Copyright (c) 2014 tpruvot
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* ===========================(LICENSE END)=============================
*
* @author   djm34
*/
__constant static const int sigma[16][16] = {
		{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
		{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
		{ 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 },
		{ 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 },
		{ 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 },
		{ 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 },
		{ 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 },
		{ 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 },
		{ 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 },
		{ 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 },
		{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
		{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
		{ 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 },
		{ 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 },
		{ 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 },
		{ 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 }
};


__constant static const sph_u32  c_IV256[8] = {
	0x6A09E667, 0xBB67AE85,
	0x3C6EF372, 0xA54FF53A,
	0x510E527F, 0x9B05688C,
	0x1F83D9AB, 0x5BE0CD19
};

/* Second part (64-80) msg never change, store it */
__constant static const sph_u32  c_Padding[16] = {
	0, 0, 0, 0,
	0x80000000, 0, 0, 0,
	0, 0, 0, 0,
	0, 1, 0, 640,
};
__constant static const sph_u32  c_u256[16] = {
	0x243F6A88, 0x85A308D3,
	0x13198A2E, 0x03707344,
	0xA4093822, 0x299F31D0,
	0x082EFA98, 0xEC4E6C89,
	0x452821E6, 0x38D01377,
	0xBE5466CF, 0x34E90C6C,
	0xC0AC29B7, 0xC97C50DD,
	0x3F84D5B5, 0xB5470917
};

#define GS(a,b,c,d,x) { \
	const sph_u32 idx1 = sigma[r][x]; \
	const sph_u32 idx2 = sigma[r][x+1]; \
	v[a] += (m[idx1] ^ c_u256[idx2]) + v[b]; \
	v[d] ^= v[a]; \
    v[d] = rotate(v[d], 16U); \
	v[c] += v[d]; \
    v[b] ^= v[c]; \
	v[b] = rotate(v[b], 20U); \
\
	v[a] += (m[idx2] ^ c_u256[idx1]) + v[b]; \
    v[d] ^= v[a]; \
	v[d] = rotate(v[d], 24U); \
	v[c] += v[d]; \
    v[b] ^= v[c]; \
	v[b] = rotate(v[b], 25U); \
}