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/*
 *  FIPS-197 compliant AES implementation
 *
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Manuel Pégourié-Gonnard committed
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 *  Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
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Paul Bakker committed
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 *
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 *  This file is part of mbed TLS (https://tls.mbed.org)
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 *
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 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
/*
 *  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
 */

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#if !defined(POLARSSL_CONFIG_FILE)
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#include "polarssl/config.h"
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#else
#include POLARSSL_CONFIG_FILE
#endif
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#if defined(POLARSSL_AES_C)
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#include <string.h>

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#include "polarssl/aes.h"
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#if defined(POLARSSL_PADLOCK_C)
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#include "polarssl/padlock.h"
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#endif
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#if defined(POLARSSL_AESNI_C)
#include "polarssl/aesni.h"
#endif
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#if defined(POLARSSL_SELF_TEST)
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#if defined(POLARSSL_PLATFORM_C)
#include "polarssl/platform.h"
#else
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#include <stdio.h>
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#define polarssl_printf printf
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#endif /* POLARSSL_PLATFORM_C */
#endif /* POLARSSL_SELF_TEST */
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#if !defined(POLARSSL_AES_ALT)

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/* Implementation that should never be optimized out by the compiler */
static void polarssl_zeroize( void *v, size_t n ) {
    volatile unsigned char *p = v; while( n-- ) *p++ = 0;
}

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/*
 * 32-bit integer manipulation macros (little endian)
 */
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#ifndef GET_UINT32_LE
#define GET_UINT32_LE(n,b,i)                            \
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{                                                       \
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    (n) = ( (uint32_t) (b)[(i)    ]       )             \
        | ( (uint32_t) (b)[(i) + 1] <<  8 )             \
        | ( (uint32_t) (b)[(i) + 2] << 16 )             \
        | ( (uint32_t) (b)[(i) + 3] << 24 );            \
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}
#endif

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#ifndef PUT_UINT32_LE
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#define PUT_UINT32_LE(n,b,i)                                    \
{                                                               \
    (b)[(i)    ] = (unsigned char) ( ( (n)       ) & 0xFF );    \
    (b)[(i) + 1] = (unsigned char) ( ( (n) >>  8 ) & 0xFF );    \
    (b)[(i) + 2] = (unsigned char) ( ( (n) >> 16 ) & 0xFF );    \
    (b)[(i) + 3] = (unsigned char) ( ( (n) >> 24 ) & 0xFF );    \
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}
#endif

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#if defined(POLARSSL_PADLOCK_C) &&                      \
    ( defined(POLARSSL_HAVE_X86) || defined(PADLOCK_ALIGN16) )
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static int aes_padlock_ace = -1;
#endif

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#if defined(POLARSSL_AES_ROM_TABLES)
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/*
 * 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
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static const uint32_t FT0[256] = { FT };
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#undef V

#define V(a,b,c,d) 0x##b##c##d##a
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static const uint32_t FT1[256] = { FT };
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#undef V

#define V(a,b,c,d) 0x##c##d##a##b
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static const uint32_t FT2[256] = { FT };
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#undef V

#define V(a,b,c,d) 0x##d##a##b##c
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static const uint32_t FT3[256] = { FT };
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#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
329
static const uint32_t RT0[256] = { RT };
330 331 332
#undef V

#define V(a,b,c,d) 0x##b##c##d##a
333
static const uint32_t RT1[256] = { RT };
334 335 336
#undef V

#define V(a,b,c,d) 0x##c##d##a##b
337
static const uint32_t RT2[256] = { RT };
338 339 340
#undef V

#define V(a,b,c,d) 0x##d##a##b##c
341
static const uint32_t RT3[256] = { RT };
342 343 344 345 346 347 348
#undef V

#undef RT

/*
 * Round constants
 */
349
static const uint32_t RCON[10] =
350 351 352 353 354 355
{
    0x00000001, 0x00000002, 0x00000004, 0x00000008,
    0x00000010, 0x00000020, 0x00000040, 0x00000080,
    0x0000001B, 0x00000036
};

356
#else /* POLARSSL_AES_ROM_TABLES */
357 358 359 360 361

/*
 * Forward S-box & tables
 */
static unsigned char FSb[256];
362 363 364 365
static uint32_t FT0[256];
static uint32_t FT1[256];
static uint32_t FT2[256];
static uint32_t FT3[256];
366 367 368 369 370

/*
 * Reverse S-box & tables
 */
static unsigned char RSb[256];
371 372 373 374
static uint32_t RT0[256];
static uint32_t RT1[256];
static uint32_t RT2[256];
static uint32_t RT3[256];
375 376 377 378

/*
 * Round constants
 */
379
static uint32_t RCON[10];
380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410

/*
 * 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++ )
    {
411
        RCON[i] = (uint32_t) x;
412 413 414 415 416 417 418 419 420 421 422 423 424
        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]];

425 426 427 428
        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;
429 430 431 432 433 434 435 436 437 438 439 440 441 442 443
        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;

444 445 446 447
        FT0[i] = ( (uint32_t) y       ) ^
                 ( (uint32_t) x <<  8 ) ^
                 ( (uint32_t) x << 16 ) ^
                 ( (uint32_t) z << 24 );
448 449 450 451 452 453 454

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

        x = RSb[i];

455 456 457 458
        RT0[i] = ( (uint32_t) MUL( 0x0E, x )       ) ^
                 ( (uint32_t) MUL( 0x09, x ) <<  8 ) ^
                 ( (uint32_t) MUL( 0x0D, x ) << 16 ) ^
                 ( (uint32_t) MUL( 0x0B, x ) << 24 );
459 460 461 462 463 464 465

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

466
#endif /* POLARSSL_AES_ROM_TABLES */
467

468 469 470 471 472 473 474 475 476 477 478 479 480
void aes_init( aes_context *ctx )
{
    memset( ctx, 0, sizeof( aes_context ) );
}

void aes_free( aes_context *ctx )
{
    if( ctx == NULL )
        return;

    polarssl_zeroize( ctx, sizeof( aes_context ) );
}

481 482 483
/*
 * AES key schedule (encryption)
 */
484 485
int aes_setkey_enc( aes_context *ctx, const unsigned char *key,
                    unsigned int keysize )
486
{
487
    unsigned int i;
488
    uint32_t *RK;
489

490
#if !defined(POLARSSL_AES_ROM_TABLES)
491 492 493 494
    if( aes_init_done == 0 )
    {
        aes_gen_tables();
        aes_init_done = 1;
495

496 497 498 499 500 501 502 503
    }
#endif

    switch( keysize )
    {
        case 128: ctx->nr = 10; break;
        case 192: ctx->nr = 12; break;
        case 256: ctx->nr = 14; break;
504
        default : return( POLARSSL_ERR_AES_INVALID_KEY_LENGTH );
505 506
    }

507 508 509 510 511 512 513
#if defined(POLARSSL_PADLOCK_C) && defined(PADLOCK_ALIGN16)
    if( aes_padlock_ace == -1 )
        aes_padlock_ace = padlock_supports( PADLOCK_ACE );

    if( aes_padlock_ace )
        ctx->rk = RK = PADLOCK_ALIGN16( ctx->buf );
    else
514
#endif
515
    ctx->rk = RK = ctx->buf;
516

517 518
#if defined(POLARSSL_AESNI_C) && defined(POLARSSL_HAVE_X86_64)
    if( aesni_supports( POLARSSL_AESNI_AES ) )
519
        return( aesni_setkey_enc( (unsigned char *) ctx->rk, key, keysize ) );
520 521
#endif

522
    for( i = 0; i < ( keysize >> 5 ); i++ )
523
    {
524
        GET_UINT32_LE( RK[i], key, i << 2 );
525 526 527 528 529 530 531 532 533
    }

    switch( ctx->nr )
    {
        case 10:

            for( i = 0; i < 10; i++, RK += 4 )
            {
                RK[4]  = RK[0] ^ RCON[i] ^
534 535 536 537
                ( (uint32_t) FSb[ ( RK[3] >>  8 ) & 0xFF ]       ) ^
                ( (uint32_t) FSb[ ( RK[3] >> 16 ) & 0xFF ] <<  8 ) ^
                ( (uint32_t) FSb[ ( RK[3] >> 24 ) & 0xFF ] << 16 ) ^
                ( (uint32_t) FSb[ ( RK[3]       ) & 0xFF ] << 24 );
538 539 540 541 542 543 544 545 546 547 548 549

                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] ^
550 551 552 553
                ( (uint32_t) FSb[ ( RK[5] >>  8 ) & 0xFF ]       ) ^
                ( (uint32_t) FSb[ ( RK[5] >> 16 ) & 0xFF ] <<  8 ) ^
                ( (uint32_t) FSb[ ( RK[5] >> 24 ) & 0xFF ] << 16 ) ^
                ( (uint32_t) FSb[ ( RK[5]       ) & 0xFF ] << 24 );
554 555 556 557 558 559 560 561 562 563 564 565 566 567

                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] ^
568 569 570 571
                ( (uint32_t) FSb[ ( RK[7] >>  8 ) & 0xFF ]       ) ^
                ( (uint32_t) FSb[ ( RK[7] >> 16 ) & 0xFF ] <<  8 ) ^
                ( (uint32_t) FSb[ ( RK[7] >> 24 ) & 0xFF ] << 16 ) ^
                ( (uint32_t) FSb[ ( RK[7]       ) & 0xFF ] << 24 );
572 573 574 575 576 577

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

                RK[12] = RK[4] ^
578 579 580 581
                ( (uint32_t) FSb[ ( RK[11]       ) & 0xFF ]       ) ^
                ( (uint32_t) FSb[ ( RK[11] >>  8 ) & 0xFF ] <<  8 ) ^
                ( (uint32_t) FSb[ ( RK[11] >> 16 ) & 0xFF ] << 16 ) ^
                ( (uint32_t) FSb[ ( RK[11] >> 24 ) & 0xFF ] << 24 );
582 583 584 585 586 587 588

                RK[13] = RK[5] ^ RK[12];
                RK[14] = RK[6] ^ RK[13];
                RK[15] = RK[7] ^ RK[14];
            }
            break;
    }
589 590

    return( 0 );
591 592 593 594 595
}

/*
 * AES key schedule (decryption)
 */
596 597
int aes_setkey_dec( aes_context *ctx, const unsigned char *key,
                    unsigned int keysize )
598
{
599
    int i, j, ret;
600
    aes_context cty;
601 602
    uint32_t *RK;
    uint32_t *SK;
603 604

    aes_init( &cty );
605

606 607 608 609 610 611 612
#if defined(POLARSSL_PADLOCK_C) && defined(PADLOCK_ALIGN16)
    if( aes_padlock_ace == -1 )
        aes_padlock_ace = padlock_supports( PADLOCK_ACE );

    if( aes_padlock_ace )
        ctx->rk = RK = PADLOCK_ALIGN16( ctx->buf );
    else
613
#endif
614
    ctx->rk = RK = ctx->buf;
615

616 617
    /* Also checks keysize */
    if( ( ret = aes_setkey_enc( &cty, key, keysize ) ) != 0 )
618
        goto exit;
619

620 621
    ctx->nr = cty.nr;

622 623 624 625 626
#if defined(POLARSSL_AESNI_C) && defined(POLARSSL_HAVE_X86_64)
    if( aesni_supports( POLARSSL_AESNI_AES ) )
    {
        aesni_inverse_key( (unsigned char *) ctx->rk,
                           (const unsigned char *) cty.rk, ctx->nr );
627
        goto exit;
628 629 630
    }
#endif

631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653
    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++;

654 655
exit:
    aes_free( &cty );
656

657
    return( ret );
658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708
}

#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
 */
709
int aes_crypt_ecb( aes_context *ctx,
710
                    int mode,
711
                    const unsigned char input[16],
712 713 714
                    unsigned char output[16] )
{
    int i;
715
    uint32_t *RK, X0, X1, X2, X3, Y0, Y1, Y2, Y3;
716

717
#if defined(POLARSSL_AESNI_C) && defined(POLARSSL_HAVE_X86_64)
718
    if( aesni_supports( POLARSSL_AESNI_AES ) )
719 720 721
        return( aesni_crypt_ecb( ctx, mode, input, output ) );
#endif

722
#if defined(POLARSSL_PADLOCK_C) && defined(POLARSSL_HAVE_X86)
723
    if( aes_padlock_ace )
724 725
    {
        if( padlock_xcryptecb( ctx, mode, input, output ) == 0 )
726 727 728 729 730
            return( 0 );

        // If padlock data misaligned, we just fall back to
        // unaccelerated mode
        //
731 732 733 734 735
    }
#endif

    RK = ctx->rk;

736 737 738 739
    GET_UINT32_LE( X0, input,  0 ); X0 ^= *RK++;
    GET_UINT32_LE( X1, input,  4 ); X1 ^= *RK++;
    GET_UINT32_LE( X2, input,  8 ); X2 ^= *RK++;
    GET_UINT32_LE( X3, input, 12 ); X3 ^= *RK++;
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    if( mode == AES_DECRYPT )
    {
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        for( i = ( ctx->nr >> 1 ) - 1; i > 0; i-- )
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        {
            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++ ^ \
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                ( (uint32_t) RSb[ ( Y0       ) & 0xFF ]       ) ^
                ( (uint32_t) RSb[ ( Y3 >>  8 ) & 0xFF ] <<  8 ) ^
                ( (uint32_t) RSb[ ( Y2 >> 16 ) & 0xFF ] << 16 ) ^
                ( (uint32_t) RSb[ ( Y1 >> 24 ) & 0xFF ] << 24 );
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        X1 = *RK++ ^ \
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                ( (uint32_t) RSb[ ( Y1       ) & 0xFF ]       ) ^
                ( (uint32_t) RSb[ ( Y0 >>  8 ) & 0xFF ] <<  8 ) ^
                ( (uint32_t) RSb[ ( Y3 >> 16 ) & 0xFF ] << 16 ) ^
                ( (uint32_t) RSb[ ( Y2 >> 24 ) & 0xFF ] << 24 );
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        X2 = *RK++ ^ \
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                ( (uint32_t) RSb[ ( Y2       ) & 0xFF ]       ) ^
                ( (uint32_t) RSb[ ( Y1 >>  8 ) & 0xFF ] <<  8 ) ^
                ( (uint32_t) RSb[ ( Y0 >> 16 ) & 0xFF ] << 16 ) ^
                ( (uint32_t) RSb[ ( Y3 >> 24 ) & 0xFF ] << 24 );
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        X3 = *RK++ ^ \
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                ( (uint32_t) RSb[ ( Y3       ) & 0xFF ]       ) ^
                ( (uint32_t) RSb[ ( Y2 >>  8 ) & 0xFF ] <<  8 ) ^
                ( (uint32_t) RSb[ ( Y1 >> 16 ) & 0xFF ] << 16 ) ^
                ( (uint32_t) RSb[ ( Y0 >> 24 ) & 0xFF ] << 24 );
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    }
    else /* AES_ENCRYPT */
    {
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        for( i = ( ctx->nr >> 1 ) - 1; i > 0; i-- )
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        {
            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++ ^ \
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                ( (uint32_t) FSb[ ( Y0       ) & 0xFF ]       ) ^
                ( (uint32_t) FSb[ ( Y1 >>  8 ) & 0xFF ] <<  8 ) ^
                ( (uint32_t) FSb[ ( Y2 >> 16 ) & 0xFF ] << 16 ) ^
                ( (uint32_t) FSb[ ( Y3 >> 24 ) & 0xFF ] << 24 );
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        X1 = *RK++ ^ \
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                ( (uint32_t) FSb[ ( Y1       ) & 0xFF ]       ) ^
                ( (uint32_t) FSb[ ( Y2 >>  8 ) & 0xFF ] <<  8 ) ^
                ( (uint32_t) FSb[ ( Y3 >> 16 ) & 0xFF ] << 16 ) ^
                ( (uint32_t) FSb[ ( Y0 >> 24 ) & 0xFF ] << 24 );
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        X2 = *RK++ ^ \
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                ( (uint32_t) FSb[ ( Y2       ) & 0xFF ]       ) ^
                ( (uint32_t) FSb[ ( Y3 >>  8 ) & 0xFF ] <<  8 ) ^
                ( (uint32_t) FSb[ ( Y0 >> 16 ) & 0xFF ] << 16 ) ^
                ( (uint32_t) FSb[ ( Y1 >> 24 ) & 0xFF ] << 24 );
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        X3 = *RK++ ^ \
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                ( (uint32_t) FSb[ ( Y3       ) & 0xFF ]       ) ^
                ( (uint32_t) FSb[ ( Y0 >>  8 ) & 0xFF ] <<  8 ) ^
                ( (uint32_t) FSb[ ( Y1 >> 16 ) & 0xFF ] << 16 ) ^
                ( (uint32_t) FSb[ ( Y2 >> 24 ) & 0xFF ] << 24 );
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    }

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    PUT_UINT32_LE( X0, output,  0 );
    PUT_UINT32_LE( X1, output,  4 );
    PUT_UINT32_LE( X2, output,  8 );
    PUT_UINT32_LE( X3, output, 12 );
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    return( 0 );
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}

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#if defined(POLARSSL_CIPHER_MODE_CBC)
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/*
 * AES-CBC buffer encryption/decryption
 */
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int aes_crypt_cbc( aes_context *ctx,
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                    int mode,
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                    size_t length,
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                    unsigned char iv[16],
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                    const unsigned char *input,
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                    unsigned char *output )
{
    int i;
    unsigned char temp[16];

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    if( length % 16 )
        return( POLARSSL_ERR_AES_INVALID_INPUT_LENGTH );

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#if defined(POLARSSL_PADLOCK_C) && defined(POLARSSL_HAVE_X86)
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    if( aes_padlock_ace )
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    {
        if( padlock_xcryptcbc( ctx, mode, length, iv, input, output ) == 0 )
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            return( 0 );
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        // If padlock data misaligned, we just fall back to
        // unaccelerated mode
        //
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    }
#endif

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

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

            input  += 16;
            output += 16;
            length -= 16;
        }
    }
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    return( 0 );
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}
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#endif /* POLARSSL_CIPHER_MODE_CBC */
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#if defined(POLARSSL_CIPHER_MODE_CFB)
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/*
 * AES-CFB128 buffer encryption/decryption
 */
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int aes_crypt_cfb128( aes_context *ctx,
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                       int mode,
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                       size_t length,
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                       size_t *iv_off,
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                       unsigned char iv[16],
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                       const unsigned char *input,
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                       unsigned char *output )
{
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    int c;
    size_t n = *iv_off;
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    if( mode == AES_DECRYPT )
    {
        while( length-- )
        {
            if( n == 0 )
                aes_crypt_ecb( ctx, AES_ENCRYPT, iv, iv );

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

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

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

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

    *iv_off = n;
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    return( 0 );
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}
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/*
 * AES-CFB8 buffer encryption/decryption
 */
int aes_crypt_cfb8( aes_context *ctx,
                       int mode,
                       size_t length,
                       unsigned char iv[16],
                       const unsigned char *input,
                       unsigned char *output )
{
    unsigned char c;
    unsigned char ov[17];

    while( length-- )
    {
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        memcpy( ov, iv, 16 );
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        aes_crypt_ecb( ctx, AES_ENCRYPT, iv, iv );

        if( mode == AES_DECRYPT )
            ov[16] = *input;

        c = *output++ = (unsigned char)( iv[0] ^ *input++ );

        if( mode == AES_ENCRYPT )
            ov[16] = c;

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        memcpy( iv, ov + 1, 16 );
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    }

    return( 0 );
}
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#endif /*POLARSSL_CIPHER_MODE_CFB */

#if defined(POLARSSL_CIPHER_MODE_CTR)
/*
 * AES-CTR buffer encryption/decryption
 */
int aes_crypt_ctr( aes_context *ctx,
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                       size_t length,
                       size_t *nc_off,
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                       unsigned char nonce_counter[16],
                       unsigned char stream_block[16],
                       const unsigned char *input,
                       unsigned char *output )
{
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    int c, i;
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    size_t n = *nc_off;
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    while( length-- )
    {
        if( n == 0 ) {
            aes_crypt_ecb( ctx, AES_ENCRYPT, nonce_counter, stream_block );

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            for( i = 16; i > 0; i-- )
                if( ++nonce_counter[i - 1] != 0 )
                    break;
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        }
        c = *input++;
        *output++ = (unsigned char)( c ^ stream_block[n] );

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

    *nc_off = n;

    return( 0 );
}
#endif /* POLARSSL_CIPHER_MODE_CTR */
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#endif /* !POLARSSL_AES_ALT */
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#if defined(POLARSSL_SELF_TEST)
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/*
 * AES test vectors from:
 *
 * http://csrc.nist.gov/archive/aes/rijndael/rijndael-vals.zip
 */
static const unsigned char aes_test_ecb_dec[3][16] =
{
    { 0x44, 0x41, 0x6A, 0xC2, 0xD1, 0xF5, 0x3C, 0x58,
      0x33, 0x03, 0x91, 0x7E, 0x6B, 0xE9, 0xEB, 0xE0 },
    { 0x48, 0xE3, 0x1E, 0x9E, 0x25, 0x67, 0x18, 0xF2,
      0x92, 0x29, 0x31, 0x9C, 0x19, 0xF1, 0x5B, 0xA4 },
    { 0x05, 0x8C, 0xCF, 0xFD, 0xBB, 0xCB, 0x38, 0x2D,
      0x1F, 0x6F, 0x56, 0x58, 0x5D, 0x8A, 0x4A, 0xDE }
};

static const unsigned char aes_test_ecb_enc[3][16] =
{
    { 0xC3, 0x4C, 0x05, 0x2C, 0xC0, 0xDA, 0x8D, 0x73,
      0x45, 0x1A, 0xFE, 0x5F, 0x03, 0xBE, 0x29, 0x7F },
    { 0xF3, 0xF6, 0x75, 0x2A, 0xE8, 0xD7, 0x83, 0x11,
      0x38, 0xF0, 0x41, 0x56, 0x06, 0x31, 0xB1, 0x14 },
    { 0x8B, 0x79, 0xEE, 0xCC, 0x93, 0xA0, 0xEE, 0x5D,
      0xFF, 0x30, 0xB4, 0xEA, 0x21, 0x63, 0x6D, 0xA4 }
};

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#if defined(POLARSSL_CIPHER_MODE_CBC)
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static const unsigned char aes_test_cbc_dec[3][16] =
{
    { 0xFA, 0xCA, 0x37, 0xE0, 0xB0, 0xC8, 0x53, 0x73,
      0xDF, 0x70, 0x6E, 0x73, 0xF7, 0xC9, 0xAF, 0x86 },
    { 0x5D, 0xF6, 0x78, 0xDD, 0x17, 0xBA, 0x4E, 0x75,
      0xB6, 0x17, 0x68, 0xC6, 0xAD, 0xEF, 0x7C, 0x7B },
    { 0x48, 0x04, 0xE1, 0x81, 0x8F, 0xE6, 0x29, 0x75,
      0x19, 0xA3, 0xE8, 0x8C, 0x57, 0x31, 0x04, 0x13 }
};

static const unsigned char aes_test_cbc_enc[3][16] =
{
    { 0x8A, 0x05, 0xFC, 0x5E, 0x09, 0x5A, 0xF4, 0x84,
      0x8A, 0x08, 0xD3, 0x28, 0xD3, 0x68, 0x8E, 0x3D },
    { 0x7B, 0xD9, 0x66, 0xD5, 0x3A, 0xD8, 0xC1, 0xBB,
      0x85, 0xD2, 0xAD, 0xFA, 0xE8, 0x7B, 0xB1, 0x04 },
    { 0xFE, 0x3C, 0x53, 0x65, 0x3E, 0x2F, 0x45, 0xB5,
      0x6F, 0xCD, 0x88, 0xB2, 0xCC, 0x89, 0x8F, 0xF0 }
};
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#endif /* POLARSSL_CIPHER_MODE_CBC */
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#if defined(POLARSSL_CIPHER_MODE_CFB)
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/*
 * AES-CFB128 test vectors from:
 *
 * http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf
 */
static const unsigned char aes_test_cfb128_key[3][32] =
{
    { 0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE, 0xD2, 0xA6,
      0xAB, 0xF7, 0x15, 0x88, 0x09, 0xCF, 0x4F, 0x3C },
    { 0x8E, 0x73, 0xB0, 0xF7, 0xDA, 0x0E, 0x64, 0x52,
      0xC8, 0x10, 0xF3, 0x2B, 0x80, 0x90, 0x79, 0xE5,
      0x62, 0xF8, 0xEA, 0xD2, 0x52, 0x2C, 0x6B, 0x7B },
    { 0x60, 0x3D, 0xEB, 0x10, 0x15, 0xCA, 0x71, 0xBE,
      0x2B, 0x73, 0xAE, 0xF0, 0x85, 0x7D, 0x77, 0x81,
      0x1F, 0x35, 0x2C, 0x07, 0x3B, 0x61, 0x08, 0xD7,
      0x2D, 0x98, 0x10, 0xA3, 0x09, 0x14, 0xDF, 0xF4 }
};

static const unsigned char aes_test_cfb128_iv[16] =
{
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
    0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F
};

static const unsigned char aes_test_cfb128_pt[64] =
{
    0x6B, 0xC1, 0xBE, 0xE2, 0x2E, 0x40, 0x9F, 0x96,
    0xE9, 0x3D, 0x7E, 0x11, 0x73, 0x93, 0x17, 0x2A,
    0xAE, 0x2D, 0x8A, 0x57, 0x1E, 0x03, 0xAC, 0x9C,
    0x9E, 0xB7, 0x6F, 0xAC, 0x45, 0xAF, 0x8E, 0x51,
    0x30, 0xC8, 0x1C, 0x46, 0xA3, 0x5C, 0xE4, 0x11,
    0xE5, 0xFB, 0xC1, 0x19, 0x1A, 0x0A, 0x52, 0xEF,
    0xF6, 0x9F, 0x24, 0x45, 0xDF, 0x4F, 0x9B, 0x17,
    0xAD, 0x2B, 0x41, 0x7B, 0xE6, 0x6C, 0x37, 0x10
};

static const unsigned char aes_test_cfb128_ct[3][64] =
{
    { 0x3B, 0x3F, 0xD9, 0x2E, 0xB7, 0x2D, 0xAD, 0x20,
      0x33, 0x34, 0x49, 0xF8, 0xE8, 0x3C, 0xFB, 0x4A,
      0xC8, 0xA6, 0x45, 0x37, 0xA0, 0xB3, 0xA9, 0x3F,
      0xCD, 0xE3, 0xCD, 0xAD, 0x9F, 0x1C, 0xE5, 0x8B,
      0x26, 0x75, 0x1F, 0x67, 0xA3, 0xCB, 0xB1, 0x40,
      0xB1, 0x80, 0x8C, 0xF1, 0x87, 0xA4, 0xF4, 0xDF,
      0xC0, 0x4B, 0x05, 0x35, 0x7C, 0x5D, 0x1C, 0x0E,
      0xEA, 0xC4, 0xC6, 0x6F, 0x9F, 0xF7, 0xF2, 0xE6 },
    { 0xCD, 0xC8, 0x0D, 0x6F, 0xDD, 0xF1, 0x8C, 0xAB,
      0x34, 0xC2, 0x59, 0x09, 0xC9, 0x9A, 0x41, 0x74,
      0x67, 0xCE, 0x7F, 0x7F, 0x81, 0x17, 0x36, 0x21,
      0x96, 0x1A, 0x2B, 0x70, 0x17, 0x1D, 0x3D, 0x7A,
      0x2E, 0x1E, 0x8A, 0x1D, 0xD5, 0x9B, 0x88, 0xB1,
      0xC8, 0xE6, 0x0F, 0xED, 0x1E, 0xFA, 0xC4, 0xC9,
      0xC0, 0x5F, 0x9F, 0x9C, 0xA9, 0x83, 0x4F, 0xA0,
      0x42, 0xAE, 0x8F, 0xBA, 0x58, 0x4B, 0x09, 0xFF },
    { 0xDC, 0x7E, 0x84, 0xBF, 0xDA, 0x79, 0x16, 0x4B,
      0x7E, 0xCD, 0x84, 0x86, 0x98, 0x5D, 0x38, 0x60,
      0x39, 0xFF, 0xED, 0x14, 0x3B, 0x28, 0xB1, 0xC8,
      0x32, 0x11, 0x3C, 0x63, 0x31, 0xE5, 0x40, 0x7B,
      0xDF, 0x10, 0x13, 0x24, 0x15, 0xE5, 0x4B, 0x92,
      0xA1, 0x3E, 0xD0, 0xA8, 0x26, 0x7A, 0xE2, 0xF9,
      0x75, 0xA3, 0x85, 0x74, 0x1A, 0xB9, 0xCE, 0xF8,
      0x20, 0x31, 0x62, 0x3D, 0x55, 0xB1, 0xE4, 0x71 }
};
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#endif /* POLARSSL_CIPHER_MODE_CFB */

#if defined(POLARSSL_CIPHER_MODE_CTR)
/*
 * AES-CTR test vectors from:
 *
 * http://www.faqs.org/rfcs/rfc3686.html
 */

static const unsigned char aes_test_ctr_key[3][16] =
{
    { 0xAE, 0x68, 0x52, 0xF8, 0x12, 0x10, 0x67, 0xCC,
      0x4B, 0xF7, 0xA5, 0x76, 0x55, 0x77, 0xF3, 0x9E },
    { 0x7E, 0x24, 0x06, 0x78, 0x17, 0xFA, 0xE0, 0xD7,
      0x43, 0xD6, 0xCE, 0x1F, 0x32, 0x53, 0x91, 0x63 },
    { 0x76, 0x91, 0xBE, 0x03, 0x5E, 0x50, 0x20, 0xA8,
      0xAC, 0x6E, 0x61, 0x85, 0x29, 0xF9, 0xA0, 0xDC }
};

static const unsigned char aes_test_ctr_nonce_counter[3][16] =
{
    { 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 },
    { 0x00, 0x6C, 0xB6, 0xDB, 0xC0, 0x54, 0x3B, 0x59,
      0xDA, 0x48, 0xD9, 0x0B, 0x00, 0x00, 0x00, 0x01 },
    { 0x00, 0xE0, 0x01, 0x7B, 0x27, 0x77, 0x7F, 0x3F,
      0x4A, 0x17, 0x86, 0xF0, 0x00, 0x00, 0x00, 0x01 }
};

static const unsigned char aes_test_ctr_pt[3][48] =
{
    { 0x53, 0x69, 0x6E, 0x67, 0x6C, 0x65, 0x20, 0x62,
      0x6C, 0x6F, 0x63, 0x6B, 0x20, 0x6D, 0x73, 0x67 },

    { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
      0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
      0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
      0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F },

    { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
      0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
      0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
      0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
      0x20, 0x21, 0x22, 0x23 }
};

static const unsigned char aes_test_ctr_ct[3][48] =
{
    { 0xE4, 0x09, 0x5D, 0x4F, 0xB7, 0xA7, 0xB3, 0x79,
      0x2D, 0x61, 0x75, 0xA3, 0x26, 0x13, 0x11, 0xB8 },
    { 0x51, 0x04, 0xA1, 0x06, 0x16, 0x8A, 0x72, 0xD9,
      0x79, 0x0D, 0x41, 0xEE, 0x8E, 0xDA, 0xD3, 0x88,
      0xEB, 0x2E, 0x1E, 0xFC, 0x46, 0xDA, 0x57, 0xC8,
      0xFC, 0xE6, 0x30, 0xDF, 0x91, 0x41, 0xBE, 0x28 },
    { 0xC1, 0xCF, 0x48, 0xA8, 0x9F, 0x2F, 0xFD, 0xD9,
      0xCF, 0x46, 0x52, 0xE9, 0xEF, 0xDB, 0x72, 0xD7,
      0x45, 0x40, 0xA4, 0x2B, 0xDE, 0x6D, 0x78, 0x36,
      0xD5, 0x9A, 0x5C, 0xEA, 0xAE, 0xF3, 0x10, 0x53,
      0x25, 0xB2, 0x07, 0x2F }
};

static const int aes_test_ctr_len[3] =
    { 16, 32, 36 };
#endif /* POLARSSL_CIPHER_MODE_CTR */
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/*
 * Checkup routine
 */
int aes_self_test( int verbose )
{
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    int ret = 0, i, j, u, v;
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    unsigned char key[32];
    unsigned char buf[64];
    unsigned char iv[16];
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#if defined(POLARSSL_CIPHER_MODE_CBC)
    unsigned char prv[16];
#endif
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#if defined(POLARSSL_CIPHER_MODE_CTR) || defined(POLARSSL_CIPHER_MODE_CFB)
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    size_t offset;
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#endif
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#if defined(POLARSSL_CIPHER_MODE_CTR)
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    int len;
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    unsigned char nonce_counter[16];
    unsigned char stream_block[16];
#endif
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    aes_context ctx;

    memset( key, 0, 32 );
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    aes_init( &ctx );
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    /*
     * ECB mode
     */
    for( i = 0; i < 6; i++ )
    {
        u = i >> 1;
        v = i  & 1;

        if( verbose != 0 )
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            polarssl_printf( "  AES-ECB-%3d (%s): ", 128 + u * 64,
                             ( v == AES_DECRYPT ) ? "dec" : "enc" );
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        memset( buf, 0, 16 );

        if( v == AES_DECRYPT )
        {
            aes_setkey_dec( &ctx, key, 128 + u * 64 );

            for( j = 0; j < 10000; j++ )
                aes_crypt_ecb( &ctx, v, buf, buf );

            if( memcmp( buf, aes_test_ecb_dec[u], 16 ) != 0 )
            {
                if( verbose != 0 )
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                    polarssl_printf( "failed\n" );
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                ret = 1;
                goto exit;
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            }
        }
        else
        {
            aes_setkey_enc( &ctx, key, 128 + u * 64 );

            for( j = 0; j < 10000; j++ )
                aes_crypt_ecb( &ctx, v, buf, buf );

            if( memcmp( buf, aes_test_ecb_enc[u], 16 ) != 0 )
            {
                if( verbose != 0 )
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                    polarssl_printf( "failed\n" );
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                ret = 1;
                goto exit;
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            }
        }

        if( verbose != 0 )
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            polarssl_printf( "passed\n" );
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    }

    if( verbose != 0 )
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        polarssl_printf( "\n" );