mirror of https://github.com/oxen-io/oxen-core.git
131 lines
5.2 KiB
C
131 lines
5.2 KiB
C
/*
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* ---------------------------------------------------------------------------
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* OpenAES License
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* ---------------------------------------------------------------------------
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* Copyright (c) 2012, Nabil S. Al Ramli, www.nalramli.com
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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* ---------------------------------------------------------------------------
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*/
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#include <stddef.h>
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#include <string.h>
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#include <assert.h>
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#include "oaes_lib_expand.h"
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#define OAES_RKEY_LEN 4
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#define OAES_COL_LEN 4
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#define OAES_ROUND_BASE 7
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static uint8_t oaes_gf_8[] = {
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0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 };
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static uint8_t oaes_sub_byte_value[16][16] = {
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// 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f,
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/*0*/ { 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76 },
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/*1*/ { 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0 },
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/*2*/ { 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15 },
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/*3*/ { 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75 },
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/*4*/ { 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84 },
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/*5*/ { 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf },
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/*6*/ { 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8 },
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/*7*/ { 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2 },
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/*8*/ { 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73 },
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/*9*/ { 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb },
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/*a*/ { 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79 },
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/*b*/ { 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08 },
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/*c*/ { 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a },
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/*d*/ { 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e },
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/*e*/ { 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf },
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/*f*/ { 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 },
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};
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static void oaes_sub_byte( uint8_t * byte )
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{
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size_t _x, _y;
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if( NULL == byte )
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return;
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_x = _y = *byte;
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_x &= 0x0f;
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_y &= 0xf0;
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_y >>= 4;
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*byte = oaes_sub_byte_value[_y][_x];
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}
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static void oaes_word_rot_left( uint8_t word[OAES_COL_LEN] )
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{
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uint8_t _temp[OAES_COL_LEN];
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if( NULL == word )
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return;
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memcpy( _temp, word + 1, OAES_COL_LEN - 1 );
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_temp[OAES_COL_LEN - 1] = word[0];
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memcpy( word, _temp, OAES_COL_LEN );
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}
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void oaes_expand_key_256(const uint8_t *data, uint8_t *exp_data)
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{
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size_t _i, _j;
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const size_t key_base = 32 / OAES_RKEY_LEN;
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const size_t num_keys = key_base + OAES_ROUND_BASE;
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assert(num_keys * OAES_RKEY_LEN * OAES_COL_LEN == 240);
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// the first key->data_len are a direct copy
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memcpy(exp_data, data, 32 );
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// apply ExpandKey algorithm for remainder
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for( _i = key_base; _i < num_keys * OAES_RKEY_LEN; _i++ )
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{
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uint8_t _temp[OAES_COL_LEN];
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memcpy( _temp, exp_data + ( _i - 1 ) * OAES_RKEY_LEN, OAES_COL_LEN );
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// transform key column
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if( 0 == _i % key_base )
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{
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oaes_word_rot_left( _temp );
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for( _j = 0; _j < OAES_COL_LEN; _j++ )
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oaes_sub_byte( _temp + _j );
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_temp[0] = _temp[0] ^ oaes_gf_8[ _i / key_base - 1 ];
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}
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else if( key_base > 6 && 4 == _i % key_base )
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{
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for( _j = 0; _j < OAES_COL_LEN; _j++ )
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oaes_sub_byte( _temp + _j );
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}
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for( _j = 0; _j < OAES_COL_LEN; _j++ )
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{
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exp_data[ _i * OAES_RKEY_LEN + _j ] =
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exp_data[ ( _i - key_base ) *
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OAES_RKEY_LEN + _j ] ^ _temp[_j];
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}
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}
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}
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