CBD_TN/CBD_FOTA_BootLoader/packages/tinycrypt-v1.0.0/src/tiny_aes.c

/*
 *  FIPS-197 compliant AES implementation
 *
 *  Based on TropicSSL: Copyright (C) 2017 Shanghai Real-Thread Technology Co., Ltd
 * 
 *  Based on XySSL: Copyright (C) 2006-2008  Christophe Devine
 *
 *  Copyright (C) 2009  Paul Bakker <polarssl_maintainer at polarssl dot org>
 *
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *    * Neither the names of PolarSSL or XySSL nor the names of its contributors
 *      may be used to endorse or promote products derived from this software
 *      without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 *  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 *  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/*
 *  The AES block cipher was designed by Vincent Rijmen and Joan Daemen.
 *
 *  http://csrc.nist.gov/encryption/aes/rijndael/Rijndael.pdf
 *  http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
 */

#include "tinycrypt_config.h"

#if defined(TINY_CRYPT_AES)

#include "tinycrypt.h"
#include <string.h>

/*
 * 32-bit integer manipulation macros (little endian)
 */
#ifndef GET_ULONG_LE
#define GET_ULONG_LE(n,b,i)                             \
{                                                       \
    (n) = ( (unsigned long) (b)[(i)    ]       )        \
        | ( (unsigned long) (b)[(i) + 1] <<  8 )        \
        | ( (unsigned long) (b)[(i) + 2] << 16 )        \
        | ( (unsigned long) (b)[(i) + 3] << 24 );       \
}
#endif

#ifndef PUT_ULONG_LE
#define PUT_ULONG_LE(n,b,i)                             \
{                                                       \
    (b)[(i)    ] = (unsigned char) ( (n)       );       \
    (b)[(i) + 1] = (unsigned char) ( (n) >>  8 );       \
    (b)[(i) + 2] = (unsigned char) ( (n) >> 16 );       \
    (b)[(i) + 3] = (unsigned char) ( (n) >> 24 );       \
}
#endif

#if defined(TINY_CRYPT_AES_ROM_TABLES)
/*
 * Forward S-box
 */
static const unsigned char FSb[256] = {
	0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5,
	0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
	0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0,
	0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
	0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC,
	0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
	0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A,
	0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
	0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0,
	0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
	0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B,
	0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
	0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85,
	0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
	0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5,
	0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
	0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17,
	0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
	0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88,
	0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
	0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C,
	0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
	0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9,
	0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
	0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6,
	0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
	0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E,
	0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
	0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94,
	0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
	0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68,
	0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16
};

/*
 * Forward tables
 */
#define FT \
\
    V(A5,63,63,C6), V(84,7C,7C,F8), V(99,77,77,EE), V(8D,7B,7B,F6), \
    V(0D,F2,F2,FF), V(BD,6B,6B,D6), V(B1,6F,6F,DE), V(54,C5,C5,91), \
    V(50,30,30,60), V(03,01,01,02), V(A9,67,67,CE), V(7D,2B,2B,56), \
    V(19,FE,FE,E7), V(62,D7,D7,B5), V(E6,AB,AB,4D), V(9A,76,76,EC), \
    V(45,CA,CA,8F), V(9D,82,82,1F), V(40,C9,C9,89), V(87,7D,7D,FA), \
    V(15,FA,FA,EF), V(EB,59,59,B2), V(C9,47,47,8E), V(0B,F0,F0,FB), \
    V(EC,AD,AD,41), V(67,D4,D4,B3), V(FD,A2,A2,5F), V(EA,AF,AF,45), \
    V(BF,9C,9C,23), V(F7,A4,A4,53), V(96,72,72,E4), V(5B,C0,C0,9B), \
    V(C2,B7,B7,75), V(1C,FD,FD,E1), V(AE,93,93,3D), V(6A,26,26,4C), \
    V(5A,36,36,6C), V(41,3F,3F,7E), V(02,F7,F7,F5), V(4F,CC,CC,83), \
    V(5C,34,34,68), V(F4,A5,A5,51), V(34,E5,E5,D1), V(08,F1,F1,F9), \
    V(93,71,71,E2), V(73,D8,D8,AB), V(53,31,31,62), V(3F,15,15,2A), \
    V(0C,04,04,08), V(52,C7,C7,95), V(65,23,23,46), V(5E,C3,C3,9D), \
    V(28,18,18,30), V(A1,96,96,37), V(0F,05,05,0A), V(B5,9A,9A,2F), \
    V(09,07,07,0E), V(36,12,12,24), V(9B,80,80,1B), V(3D,E2,E2,DF), \
    V(26,EB,EB,CD), V(69,27,27,4E), V(CD,B2,B2,7F), V(9F,75,75,EA), \
    V(1B,09,09,12), V(9E,83,83,1D), V(74,2C,2C,58), V(2E,1A,1A,34), \
    V(2D,1B,1B,36), V(B2,6E,6E,DC), V(EE,5A,5A,B4), V(FB,A0,A0,5B), \
    V(F6,52,52,A4), V(4D,3B,3B,76), V(61,D6,D6,B7), V(CE,B3,B3,7D), \
    V(7B,29,29,52), V(3E,E3,E3,DD), V(71,2F,2F,5E), V(97,84,84,13), \
    V(F5,53,53,A6), V(68,D1,D1,B9), V(00,00,00,00), V(2C,ED,ED,C1), \
    V(60,20,20,40), V(1F,FC,FC,E3), V(C8,B1,B1,79), V(ED,5B,5B,B6), \
    V(BE,6A,6A,D4), V(46,CB,CB,8D), V(D9,BE,BE,67), V(4B,39,39,72), \
    V(DE,4A,4A,94), V(D4,4C,4C,98), V(E8,58,58,B0), V(4A,CF,CF,85), \
    V(6B,D0,D0,BB), V(2A,EF,EF,C5), V(E5,AA,AA,4F), V(16,FB,FB,ED), \
    V(C5,43,43,86), V(D7,4D,4D,9A), V(55,33,33,66), V(94,85,85,11), \
    V(CF,45,45,8A), V(10,F9,F9,E9), V(06,02,02,04), V(81,7F,7F,FE), \
    V(F0,50,50,A0), V(44,3C,3C,78), V(BA,9F,9F,25), V(E3,A8,A8,4B), \
    V(F3,51,51,A2), V(FE,A3,A3,5D), V(C0,40,40,80), V(8A,8F,8F,05), \
    V(AD,92,92,3F), V(BC,9D,9D,21), V(48,38,38,70), V(04,F5,F5,F1), \
    V(DF,BC,BC,63), V(C1,B6,B6,77), V(75,DA,DA,AF), V(63,21,21,42), \
    V(30,10,10,20), V(1A,FF,FF,E5), V(0E,F3,F3,FD), V(6D,D2,D2,BF), \
    V(4C,CD,CD,81), V(14,0C,0C,18), V(35,13,13,26), V(2F,EC,EC,C3), \
    V(E1,5F,5F,BE), V(A2,97,97,35), V(CC,44,44,88), V(39,17,17,2E), \
    V(57,C4,C4,93), V(F2,A7,A7,55), V(82,7E,7E,FC), V(47,3D,3D,7A), \
    V(AC,64,64,C8), V(E7,5D,5D,BA), V(2B,19,19,32), V(95,73,73,E6), \
    V(A0,60,60,C0), V(98,81,81,19), V(D1,4F,4F,9E), V(7F,DC,DC,A3), \
    V(66,22,22,44), V(7E,2A,2A,54), V(AB,90,90,3B), V(83,88,88,0B), \
    V(CA,46,46,8C), V(29,EE,EE,C7), V(D3,B8,B8,6B), V(3C,14,14,28), \
    V(79,DE,DE,A7), V(E2,5E,5E,BC), V(1D,0B,0B,16), V(76,DB,DB,AD), \
    V(3B,E0,E0,DB), V(56,32,32,64), V(4E,3A,3A,74), V(1E,0A,0A,14), \
    V(DB,49,49,92), V(0A,06,06,0C), V(6C,24,24,48), V(E4,5C,5C,B8), \
    V(5D,C2,C2,9F), V(6E,D3,D3,BD), V(EF,AC,AC,43), V(A6,62,62,C4), \
    V(A8,91,91,39), V(A4,95,95,31), V(37,E4,E4,D3), V(8B,79,79,F2), \
    V(32,E7,E7,D5), V(43,C8,C8,8B), V(59,37,37,6E), V(B7,6D,6D,DA), \
    V(8C,8D,8D,01), V(64,D5,D5,B1), V(D2,4E,4E,9C), V(E0,A9,A9,49), \
    V(B4,6C,6C,D8), V(FA,56,56,AC), V(07,F4,F4,F3), V(25,EA,EA,CF), \
    V(AF,65,65,CA), V(8E,7A,7A,F4), V(E9,AE,AE,47), V(18,08,08,10), \
    V(D5,BA,BA,6F), V(88,78,78,F0), V(6F,25,25,4A), V(72,2E,2E,5C), \
    V(24,1C,1C,38), V(F1,A6,A6,57), V(C7,B4,B4,73), V(51,C6,C6,97), \
    V(23,E8,E8,CB), V(7C,DD,DD,A1), V(9C,74,74,E8), V(21,1F,1F,3E), \
    V(DD,4B,4B,96), V(DC,BD,BD,61), V(86,8B,8B,0D), V(85,8A,8A,0F), \
    V(90,70,70,E0), V(42,3E,3E,7C), V(C4,B5,B5,71), V(AA,66,66,CC), \
    V(D8,48,48,90), V(05,03,03,06), V(01,F6,F6,F7), V(12,0E,0E,1C), \
    V(A3,61,61,C2), V(5F,35,35,6A), V(F9,57,57,AE), V(D0,B9,B9,69), \
    V(91,86,86,17), V(58,C1,C1,99), V(27,1D,1D,3A), V(B9,9E,9E,27), \
    V(38,E1,E1,D9), V(13,F8,F8,EB), V(B3,98,98,2B), V(33,11,11,22), \
    V(BB,69,69,D2), V(70,D9,D9,A9), V(89,8E,8E,07), V(A7,94,94,33), \
    V(B6,9B,9B,2D), V(22,1E,1E,3C), V(92,87,87,15), V(20,E9,E9,C9), \
    V(49,CE,CE,87), V(FF,55,55,AA), V(78,28,28,50), V(7A,DF,DF,A5), \
    V(8F,8C,8C,03), V(F8,A1,A1,59), V(80,89,89,09), V(17,0D,0D,1A), \
    V(DA,BF,BF,65), V(31,E6,E6,D7), V(C6,42,42,84), V(B8,68,68,D0), \
    V(C3,41,41,82), V(B0,99,99,29), V(77,2D,2D,5A), V(11,0F,0F,1E), \
    V(CB,B0,B0,7B), V(FC,54,54,A8), V(D6,BB,BB,6D), V(3A,16,16,2C)

#define V(a,b,c,d) 0x##a##b##c##d
static const unsigned long FT0[256] = { FT };

#undef V

#define V(a,b,c,d) 0x##b##c##d##a
static const unsigned long FT1[256] = { FT };

#undef V

#define V(a,b,c,d) 0x##c##d##a##b
static const unsigned long FT2[256] = { FT };

#undef V

#define V(a,b,c,d) 0x##d##a##b##c
static const unsigned long FT3[256] = { FT };

#undef V

#undef FT

/*
 * Reverse S-box
 */
static const unsigned char RSb[256] = {
	0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38,
	0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
	0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87,
	0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
	0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D,
	0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
	0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2,
	0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
	0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16,
	0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
	0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA,
	0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
	0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A,
	0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
	0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02,
	0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
	0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA,
	0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
	0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85,
	0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
	0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89,
	0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
	0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20,
	0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
	0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31,
	0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
	0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D,
	0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
	0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0,
	0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
	0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26,
	0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D
};

/*
 * Reverse tables
 */
#define RT \
\
    V(50,A7,F4,51), V(53,65,41,7E), V(C3,A4,17,1A), V(96,5E,27,3A), \
    V(CB,6B,AB,3B), V(F1,45,9D,1F), V(AB,58,FA,AC), V(93,03,E3,4B), \
    V(55,FA,30,20), V(F6,6D,76,AD), V(91,76,CC,88), V(25,4C,02,F5), \
    V(FC,D7,E5,4F), V(D7,CB,2A,C5), V(80,44,35,26), V(8F,A3,62,B5), \
    V(49,5A,B1,DE), V(67,1B,BA,25), V(98,0E,EA,45), V(E1,C0,FE,5D), \
    V(02,75,2F,C3), V(12,F0,4C,81), V(A3,97,46,8D), V(C6,F9,D3,6B), \
    V(E7,5F,8F,03), V(95,9C,92,15), V(EB,7A,6D,BF), V(DA,59,52,95), \
    V(2D,83,BE,D4), V(D3,21,74,58), V(29,69,E0,49), V(44,C8,C9,8E), \
    V(6A,89,C2,75), V(78,79,8E,F4), V(6B,3E,58,99), V(DD,71,B9,27), \
    V(B6,4F,E1,BE), V(17,AD,88,F0), V(66,AC,20,C9), V(B4,3A,CE,7D), \
    V(18,4A,DF,63), V(82,31,1A,E5), V(60,33,51,97), V(45,7F,53,62), \
    V(E0,77,64,B1), V(84,AE,6B,BB), V(1C,A0,81,FE), V(94,2B,08,F9), \
    V(58,68,48,70), V(19,FD,45,8F), V(87,6C,DE,94), V(B7,F8,7B,52), \
    V(23,D3,73,AB), V(E2,02,4B,72), V(57,8F,1F,E3), V(2A,AB,55,66), \
    V(07,28,EB,B2), V(03,C2,B5,2F), V(9A,7B,C5,86), V(A5,08,37,D3), \
    V(F2,87,28,30), V(B2,A5,BF,23), V(BA,6A,03,02), V(5C,82,16,ED), \
    V(2B,1C,CF,8A), V(92,B4,79,A7), V(F0,F2,07,F3), V(A1,E2,69,4E), \
    V(CD,F4,DA,65), V(D5,BE,05,06), V(1F,62,34,D1), V(8A,FE,A6,C4), \
    V(9D,53,2E,34), V(A0,55,F3,A2), V(32,E1,8A,05), V(75,EB,F6,A4), \
    V(39,EC,83,0B), V(AA,EF,60,40), V(06,9F,71,5E), V(51,10,6E,BD), \
    V(F9,8A,21,3E), V(3D,06,DD,96), V(AE,05,3E,DD), V(46,BD,E6,4D), \
    V(B5,8D,54,91), V(05,5D,C4,71), V(6F,D4,06,04), V(FF,15,50,60), \
    V(24,FB,98,19), V(97,E9,BD,D6), V(CC,43,40,89), V(77,9E,D9,67), \
    V(BD,42,E8,B0), V(88,8B,89,07), V(38,5B,19,E7), V(DB,EE,C8,79), \
    V(47,0A,7C,A1), V(E9,0F,42,7C), V(C9,1E,84,F8), V(00,00,00,00), \
    V(83,86,80,09), V(48,ED,2B,32), V(AC,70,11,1E), V(4E,72,5A,6C), \
    V(FB,FF,0E,FD), V(56,38,85,0F), V(1E,D5,AE,3D), V(27,39,2D,36), \
    V(64,D9,0F,0A), V(21,A6,5C,68), V(D1,54,5B,9B), V(3A,2E,36,24), \
    V(B1,67,0A,0C), V(0F,E7,57,93), V(D2,96,EE,B4), V(9E,91,9B,1B), \
    V(4F,C5,C0,80), V(A2,20,DC,61), V(69,4B,77,5A), V(16,1A,12,1C), \
    V(0A,BA,93,E2), V(E5,2A,A0,C0), V(43,E0,22,3C), V(1D,17,1B,12), \
    V(0B,0D,09,0E), V(AD,C7,8B,F2), V(B9,A8,B6,2D), V(C8,A9,1E,14), \
    V(85,19,F1,57), V(4C,07,75,AF), V(BB,DD,99,EE), V(FD,60,7F,A3), \
    V(9F,26,01,F7), V(BC,F5,72,5C), V(C5,3B,66,44), V(34,7E,FB,5B), \
    V(76,29,43,8B), V(DC,C6,23,CB), V(68,FC,ED,B6), V(63,F1,E4,B8), \
    V(CA,DC,31,D7), V(10,85,63,42), V(40,22,97,13), V(20,11,C6,84), \
    V(7D,24,4A,85), V(F8,3D,BB,D2), V(11,32,F9,AE), V(6D,A1,29,C7), \
    V(4B,2F,9E,1D), V(F3,30,B2,DC), V(EC,52,86,0D), V(D0,E3,C1,77), \
    V(6C,16,B3,2B), V(99,B9,70,A9), V(FA,48,94,11), V(22,64,E9,47), \
    V(C4,8C,FC,A8), V(1A,3F,F0,A0), V(D8,2C,7D,56), V(EF,90,33,22), \
    V(C7,4E,49,87), V(C1,D1,38,D9), V(FE,A2,CA,8C), V(36,0B,D4,98), \
    V(CF,81,F5,A6), V(28,DE,7A,A5), V(26,8E,B7,DA), V(A4,BF,AD,3F), \
    V(E4,9D,3A,2C), V(0D,92,78,50), V(9B,CC,5F,6A), V(62,46,7E,54), \
    V(C2,13,8D,F6), V(E8,B8,D8,90), V(5E,F7,39,2E), V(F5,AF,C3,82), \
    V(BE,80,5D,9F), V(7C,93,D0,69), V(A9,2D,D5,6F), V(B3,12,25,CF), \
    V(3B,99,AC,C8), V(A7,7D,18,10), V(6E,63,9C,E8), V(7B,BB,3B,DB), \
    V(09,78,26,CD), V(F4,18,59,6E), V(01,B7,9A,EC), V(A8,9A,4F,83), \
    V(65,6E,95,E6), V(7E,E6,FF,AA), V(08,CF,BC,21), V(E6,E8,15,EF), \
    V(D9,9B,E7,BA), V(CE,36,6F,4A), V(D4,09,9F,EA), V(D6,7C,B0,29), \
    V(AF,B2,A4,31), V(31,23,3F,2A), V(30,94,A5,C6), V(C0,66,A2,35), \
    V(37,BC,4E,74), V(A6,CA,82,FC), V(B0,D0,90,E0), V(15,D8,A7,33), \
    V(4A,98,04,F1), V(F7,DA,EC,41), V(0E,50,CD,7F), V(2F,F6,91,17), \
    V(8D,D6,4D,76), V(4D,B0,EF,43), V(54,4D,AA,CC), V(DF,04,96,E4), \
    V(E3,B5,D1,9E), V(1B,88,6A,4C), V(B8,1F,2C,C1), V(7F,51,65,46), \
    V(04,EA,5E,9D), V(5D,35,8C,01), V(73,74,87,FA), V(2E,41,0B,FB), \
    V(5A,1D,67,B3), V(52,D2,DB,92), V(33,56,10,E9), V(13,47,D6,6D), \
    V(8C,61,D7,9A), V(7A,0C,A1,37), V(8E,14,F8,59), V(89,3C,13,EB), \
    V(EE,27,A9,CE), V(35,C9,61,B7), V(ED,E5,1C,E1), V(3C,B1,47,7A), \
    V(59,DF,D2,9C), V(3F,73,F2,55), V(79,CE,14,18), V(BF,37,C7,73), \
    V(EA,CD,F7,53), V(5B,AA,FD,5F), V(14,6F,3D,DF), V(86,DB,44,78), \
    V(81,F3,AF,CA), V(3E,C4,68,B9), V(2C,34,24,38), V(5F,40,A3,C2), \
    V(72,C3,1D,16), V(0C,25,E2,BC), V(8B,49,3C,28), V(41,95,0D,FF), \
    V(71,01,A8,39), V(DE,B3,0C,08), V(9C,E4,B4,D8), V(90,C1,56,64), \
    V(61,84,CB,7B), V(70,B6,32,D5), V(74,5C,6C,48), V(42,57,B8,D0)

#define V(a,b,c,d) 0x##a##b##c##d
static const unsigned long RT0[256] = { RT };

#undef V

#define V(a,b,c,d) 0x##b##c##d##a
static const unsigned long RT1[256] = { RT };

#undef V

#define V(a,b,c,d) 0x##c##d##a##b
static const unsigned long RT2[256] = { RT };

#undef V

#define V(a,b,c,d) 0x##d##a##b##c
static const unsigned long RT3[256] = { RT };

#undef V

#undef RT

/*
 * Round constants
 */
static const unsigned long RCON[10] = {
	0x00000001, 0x00000002, 0x00000004, 0x00000008,
	0x00000010, 0x00000020, 0x00000040, 0x00000080,
	0x0000001B, 0x00000036
};

#else

/*
 * Forward S-box & tables
 */
static unsigned char FSb[256];
static unsigned long FT0[256];
static unsigned long FT1[256];
static unsigned long FT2[256];
static unsigned long FT3[256];

/*
 * Reverse S-box & tables
 */
static unsigned char RSb[256];
static unsigned long RT0[256];
static unsigned long RT1[256];
static unsigned long RT2[256];
static unsigned long RT3[256];

/*
 * Round constants
 */
static unsigned long RCON[10];

/*
 * Tables generation code
 */
#define ROTL8(x) ( ( x << 8 ) & 0xFFFFFFFF ) | ( x >> 24 )
#define XTIME(x) ( ( x << 1 ) ^ ( ( x & 0x80 ) ? 0x1B : 0x00 ) )
#define MUL(x,y) ( ( x && y ) ? pow[(log[x]+log[y]) % 255] : 0 )

static int aes_init_done = 0;

static void aes_gen_tables(void)
{
	int i, x, y, z;
	int pow[256];
	int log[256];

	/*
	 * compute pow and log tables over GF(2^8)
	 */
	for (i = 0, x = 1; i < 256; i++) {
		pow[i] = x;
		log[x] = i;
		x = (x ^ XTIME(x)) & 0xFF;
	}

	/*
	 * calculate the round constants
	 */
	for (i = 0, x = 1; i < 10; i++) {
		RCON[i] = (unsigned long)x;
		x = XTIME(x) & 0xFF;
	}

	/*
	 * generate the forward and reverse S-boxes
	 */
	FSb[0x00] = 0x63;
	RSb[0x63] = 0x00;

	for (i = 1; i < 256; i++) {
		x = pow[255 - log[i]];

		y = x;
		y = ((y << 1) | (y >> 7)) & 0xFF;
		x ^= y;
		y = ((y << 1) | (y >> 7)) & 0xFF;
		x ^= y;
		y = ((y << 1) | (y >> 7)) & 0xFF;
		x ^= y;
		y = ((y << 1) | (y >> 7)) & 0xFF;
		x ^= y ^ 0x63;

		FSb[i] = (unsigned char)x;
		RSb[x] = (unsigned char)i;
	}

	/*
	 * generate the forward and reverse tables
	 */
	for (i = 0; i < 256; i++) {
		x = FSb[i];
		y = XTIME(x) & 0xFF;
		z = (y ^ x) & 0xFF;

		FT0[i] = ((unsigned long)y) ^
		    ((unsigned long)x << 8) ^
		    ((unsigned long)x << 16) ^ ((unsigned long)z << 24);

		FT1[i] = ROTL8(FT0[i]);
		FT2[i] = ROTL8(FT1[i]);
		FT3[i] = ROTL8(FT2[i]);

		x = RSb[i];

		RT0[i] = ((unsigned long)MUL(0x0E, x)) ^
		    ((unsigned long)MUL(0x09, x) << 8) ^
		    ((unsigned long)MUL(0x0D, x) << 16) ^
		    ((unsigned long)MUL(0x0B, x) << 24);

		RT1[i] = ROTL8(RT0[i]);
		RT2[i] = ROTL8(RT1[i]);
		RT3[i] = ROTL8(RT2[i]);
	}
}

#endif

/*
 * AES key schedule (encryption)
 */
void tiny_aes_setkey_enc(tiny_aes_context * ctx, unsigned char *key, int keysize)
{
	int i;
	unsigned long *RK;

#if !defined(TINY_CRYPT_AES_ROM_TABLES)
	if (aes_init_done == 0) {
		aes_gen_tables();
		aes_init_done = 1;
	}
#endif

	switch (keysize) {
	case 128:
		ctx->nr = 10;
		break;
	case 192:
		ctx->nr = 12;
		break;
	case 256:
		ctx->nr = 14;
		break;
	default:
		return;
	}

	ctx->rk = RK = ctx->buf;

	for (i = 0; i < (keysize >> 5); i++) {
		GET_ULONG_LE(RK[i], key, i << 2);
	}

	switch (ctx->nr) {
	case 10:

		for (i = 0; i < 10; i++, RK += 4) {
			RK[4] = RK[0] ^ RCON[i] ^
			    ((unsigned long)FSb[(RK[3] >> 8) & 0xFF]) ^
			    ((unsigned long)FSb[(RK[3] >> 16) & 0xFF] << 8) ^
			    ((unsigned long)FSb[(RK[3] >> 24) & 0xFF] << 16) ^
			    ((unsigned long)FSb[(RK[3]) & 0xFF] << 24);

			RK[5] = RK[1] ^ RK[4];
			RK[6] = RK[2] ^ RK[5];
			RK[7] = RK[3] ^ RK[6];
		}
		break;

	case 12:

		for (i = 0; i < 8; i++, RK += 6) {
			RK[6] = RK[0] ^ RCON[i] ^
			    ((unsigned long)FSb[(RK[5] >> 8) & 0xFF]) ^
			    ((unsigned long)FSb[(RK[5] >> 16) & 0xFF] << 8) ^
			    ((unsigned long)FSb[(RK[5] >> 24) & 0xFF] << 16) ^
			    ((unsigned long)FSb[(RK[5]) & 0xFF] << 24);

			RK[7] = RK[1] ^ RK[6];
			RK[8] = RK[2] ^ RK[7];
			RK[9] = RK[3] ^ RK[8];
			RK[10] = RK[4] ^ RK[9];
			RK[11] = RK[5] ^ RK[10];
		}
		break;

	case 14:

		for (i = 0; i < 7; i++, RK += 8) {
			RK[8] = RK[0] ^ RCON[i] ^
			    ((unsigned long)FSb[(RK[7] >> 8) & 0xFF]) ^
			    ((unsigned long)FSb[(RK[7] >> 16) & 0xFF] << 8) ^
			    ((unsigned long)FSb[(RK[7] >> 24) & 0xFF] << 16) ^
			    ((unsigned long)FSb[(RK[7]) & 0xFF] << 24);

			RK[9] = RK[1] ^ RK[8];
			RK[10] = RK[2] ^ RK[9];
			RK[11] = RK[3] ^ RK[10];

			RK[12] = RK[4] ^
			    ((unsigned long)FSb[(RK[11]) & 0xFF]) ^
			    ((unsigned long)FSb[(RK[11] >> 8) & 0xFF] << 8) ^
			    ((unsigned long)FSb[(RK[11] >> 16) & 0xFF] << 16) ^
			    ((unsigned long)FSb[(RK[11] >> 24) & 0xFF] << 24);

			RK[13] = RK[5] ^ RK[12];
			RK[14] = RK[6] ^ RK[13];
			RK[15] = RK[7] ^ RK[14];
		}
		break;

	default:

		break;
	}
}

/*
 * AES key schedule (decryption)
 */
void tiny_aes_setkey_dec(tiny_aes_context * ctx, unsigned char *key, int keysize)
{
	int i, j;
	tiny_aes_context cty;
	unsigned long *RK;
	unsigned long *SK;

	switch (keysize) {
	case 128:
		ctx->nr = 10;
		break;
	case 192:
		ctx->nr = 12;
		break;
	case 256:
		ctx->nr = 14;
		break;
	default:
		return;
	}

	ctx->rk = RK = ctx->buf;

	tiny_aes_setkey_enc(&cty, key, keysize);
	SK = cty.rk + cty.nr * 4;

	*RK++ = *SK++;
	*RK++ = *SK++;
	*RK++ = *SK++;
	*RK++ = *SK++;

	for (i = ctx->nr - 1, SK -= 8; i > 0; i--, SK -= 8) {
		for (j = 0; j < 4; j++, SK++) {
			*RK++ = RT0[FSb[(*SK) & 0xFF]] ^
			    RT1[FSb[(*SK >> 8) & 0xFF]] ^
			    RT2[FSb[(*SK >> 16) & 0xFF]] ^
			    RT3[FSb[(*SK >> 24) & 0xFF]];
		}
	}

	*RK++ = *SK++;
	*RK++ = *SK++;
	*RK++ = *SK++;
	*RK++ = *SK++;

	memset(&cty, 0, sizeof(tiny_aes_context));
}

#define AES_FROUND(X0,X1,X2,X3,Y0,Y1,Y2,Y3)     \
{                                               \
    X0 = *RK++ ^ FT0[ ( Y0       ) & 0xFF ] ^   \
                 FT1[ ( Y1 >>  8 ) & 0xFF ] ^   \
                 FT2[ ( Y2 >> 16 ) & 0xFF ] ^   \
                 FT3[ ( Y3 >> 24 ) & 0xFF ];    \
                                                \
    X1 = *RK++ ^ FT0[ ( Y1       ) & 0xFF ] ^   \
                 FT1[ ( Y2 >>  8 ) & 0xFF ] ^   \
                 FT2[ ( Y3 >> 16 ) & 0xFF ] ^   \
                 FT3[ ( Y0 >> 24 ) & 0xFF ];    \
                                                \
    X2 = *RK++ ^ FT0[ ( Y2       ) & 0xFF ] ^   \
                 FT1[ ( Y3 >>  8 ) & 0xFF ] ^   \
                 FT2[ ( Y0 >> 16 ) & 0xFF ] ^   \
                 FT3[ ( Y1 >> 24 ) & 0xFF ];    \
                                                \
    X3 = *RK++ ^ FT0[ ( Y3       ) & 0xFF ] ^   \
                 FT1[ ( Y0 >>  8 ) & 0xFF ] ^   \
                 FT2[ ( Y1 >> 16 ) & 0xFF ] ^   \
                 FT3[ ( Y2 >> 24 ) & 0xFF ];    \
}

#define AES_RROUND(X0,X1,X2,X3,Y0,Y1,Y2,Y3)     \
{                                               \
    X0 = *RK++ ^ RT0[ ( Y0       ) & 0xFF ] ^   \
                 RT1[ ( Y3 >>  8 ) & 0xFF ] ^   \
                 RT2[ ( Y2 >> 16 ) & 0xFF ] ^   \
                 RT3[ ( Y1 >> 24 ) & 0xFF ];    \
                                                \
    X1 = *RK++ ^ RT0[ ( Y1       ) & 0xFF ] ^   \
                 RT1[ ( Y0 >>  8 ) & 0xFF ] ^   \
                 RT2[ ( Y3 >> 16 ) & 0xFF ] ^   \
                 RT3[ ( Y2 >> 24 ) & 0xFF ];    \
                                                \
    X2 = *RK++ ^ RT0[ ( Y2       ) & 0xFF ] ^   \
                 RT1[ ( Y1 >>  8 ) & 0xFF ] ^   \
                 RT2[ ( Y0 >> 16 ) & 0xFF ] ^   \
                 RT3[ ( Y3 >> 24 ) & 0xFF ];    \
                                                \
    X3 = *RK++ ^ RT0[ ( Y3       ) & 0xFF ] ^   \
                 RT1[ ( Y2 >>  8 ) & 0xFF ] ^   \
                 RT2[ ( Y1 >> 16 ) & 0xFF ] ^   \
                 RT3[ ( Y0 >> 24 ) & 0xFF ];    \
}

/*
 * AES-ECB block encryption/decryption
 */
void tiny_aes_crypt_ecb(tiny_aes_context * ctx,
		   int mode, unsigned char input[16], unsigned char output[16])
{
	int i;
	unsigned long *RK, X0, X1, X2, X3, Y0, Y1, Y2, Y3;

	RK = ctx->rk;

	GET_ULONG_LE(X0, input, 0);
	X0 ^= *RK++;
	GET_ULONG_LE(X1, input, 4);
	X1 ^= *RK++;
	GET_ULONG_LE(X2, input, 8);
	X2 ^= *RK++;
	GET_ULONG_LE(X3, input, 12);
	X3 ^= *RK++;

	if (mode == AES_DECRYPT) {
		for (i = (ctx->nr >> 1) - 1; i > 0; i--) {
			AES_RROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3);
			AES_RROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3);
		}

		AES_RROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3);

		X0 = *RK++ ^
		    ((unsigned long)RSb[(Y0) & 0xFF]) ^
		    ((unsigned long)RSb[(Y3 >> 8) & 0xFF] << 8) ^
		    ((unsigned long)RSb[(Y2 >> 16) & 0xFF] << 16) ^
		    ((unsigned long)RSb[(Y1 >> 24) & 0xFF] << 24);

		X1 = *RK++ ^
		    ((unsigned long)RSb[(Y1) & 0xFF]) ^
		    ((unsigned long)RSb[(Y0 >> 8) & 0xFF] << 8) ^
		    ((unsigned long)RSb[(Y3 >> 16) & 0xFF] << 16) ^
		    ((unsigned long)RSb[(Y2 >> 24) & 0xFF] << 24);

		X2 = *RK++ ^
		    ((unsigned long)RSb[(Y2) & 0xFF]) ^
		    ((unsigned long)RSb[(Y1 >> 8) & 0xFF] << 8) ^
		    ((unsigned long)RSb[(Y0 >> 16) & 0xFF] << 16) ^
		    ((unsigned long)RSb[(Y3 >> 24) & 0xFF] << 24);

		X3 = *RK++ ^
		    ((unsigned long)RSb[(Y3) & 0xFF]) ^
		    ((unsigned long)RSb[(Y2 >> 8) & 0xFF] << 8) ^
		    ((unsigned long)RSb[(Y1 >> 16) & 0xFF] << 16) ^
		    ((unsigned long)RSb[(Y0 >> 24) & 0xFF] << 24);
	} else {		/* AES_ENCRYPT */
		for (i = (ctx->nr >> 1) - 1; i > 0; i--) {
			AES_FROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3);
			AES_FROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3);
		}

		AES_FROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3);

		X0 = *RK++ ^
		    ((unsigned long)FSb[(Y0) & 0xFF]) ^
		    ((unsigned long)FSb[(Y1 >> 8) & 0xFF] << 8) ^
		    ((unsigned long)FSb[(Y2 >> 16) & 0xFF] << 16) ^
		    ((unsigned long)FSb[(Y3 >> 24) & 0xFF] << 24);

		X1 = *RK++ ^
		    ((unsigned long)FSb[(Y1) & 0xFF]) ^
		    ((unsigned long)FSb[(Y2 >> 8) & 0xFF] << 8) ^
		    ((unsigned long)FSb[(Y3 >> 16) & 0xFF] << 16) ^
		    ((unsigned long)FSb[(Y0 >> 24) & 0xFF] << 24);

		X2 = *RK++ ^
		    ((unsigned long)FSb[(Y2) & 0xFF]) ^
		    ((unsigned long)FSb[(Y3 >> 8) & 0xFF] << 8) ^
		    ((unsigned long)FSb[(Y0 >> 16) & 0xFF] << 16) ^
		    ((unsigned long)FSb[(Y1 >> 24) & 0xFF] << 24);

		X3 = *RK++ ^
		    ((unsigned long)FSb[(Y3) & 0xFF]) ^
		    ((unsigned long)FSb[(Y0 >> 8) & 0xFF] << 8) ^
		    ((unsigned long)FSb[(Y1 >> 16) & 0xFF] << 16) ^
		    ((unsigned long)FSb[(Y2 >> 24) & 0xFF] << 24);
	}

	PUT_ULONG_LE(X0, output, 0);
	PUT_ULONG_LE(X1, output, 4);
	PUT_ULONG_LE(X2, output, 8);
	PUT_ULONG_LE(X3, output, 12);
}

/*
 * AES-CBC buffer encryption/decryption
 */
void tiny_aes_crypt_cbc(tiny_aes_context * ctx,
		   int mode,
		   int length,
		   unsigned char iv[16],
		   unsigned char *input, unsigned char *output)
{
	int i;
	unsigned char temp[16];

	if (mode == AES_DECRYPT) {
		while (length > 0) {
			memcpy(temp, input, 16);
			tiny_aes_crypt_ecb(ctx, mode, input, output);

			for (i = 0; i < 16; i++)
				output[i] = (unsigned char)(output[i] ^ iv[i]);

			memcpy(iv, temp, 16);

			input += 16;
			output += 16;
			length -= 16;
		}
	} else {
		while (length > 0) {
			for (i = 0; i < 16; i++)
				output[i] = (unsigned char)(input[i] ^ iv[i]);

			tiny_aes_crypt_ecb(ctx, mode, output, output);
			memcpy(iv, output, 16);

			input += 16;
			output += 16;
			length -= 16;
		}
	}
}

/*
 * AES-CFB128 buffer encryption/decryption
 */
void tiny_aes_crypt_cfb128(tiny_aes_context * ctx,
		      int mode,
		      int length,
		      int *iv_off,
		      unsigned char iv[16],
		      unsigned char *input, unsigned char *output)
{
	int c, n = *iv_off;

	if (mode == AES_DECRYPT) {
		while (length--) {
			if (n == 0)
				tiny_aes_crypt_ecb(ctx, AES_ENCRYPT, iv, iv);

			c = *input++;
			*output++ = (unsigned char)(c ^ iv[n]);
			iv[n] = (unsigned char)c;

			n = (n + 1) & 0x0F;
		}
	} else {
		while (length--) {
			if (n == 0)
				tiny_aes_crypt_ecb(ctx, AES_ENCRYPT, iv, iv);

			iv[n] = *output++ = (unsigned char)(iv[n] ^ *input++);

			n = (n + 1) & 0x0F;
		}
	}

	*iv_off = n;
}

#endif