/*
* ---------------------------------------------------------------------------
* OpenAES License
* ---------------------------------------------------------------------------
* Copyright (c) 2012, Nabil S. Al Ramli, www.nalramli.com
* 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.
*
* 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 HOLDER 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.
* ---------------------------------------------------------------------------
*/
/*static const char _NR[] = {
0x4e,0x61,0x62,0x69,0x6c,0x20,0x53,0x2e,0x20,
0x41,0x6c,0x20,0x52,0x61,0x6d,0x6c,0x69,0x00 };*/
#include <stddef.h>
#include <time.h>
//#include <sys/timeb.h>
#include "ftime.h"
#include <malloc.h>
#include <string.h>
#include <unistd.h>
#ifdef WIN32
#include <process.h>
#endif
#include "oaes_config.h"
#include "oaes_lib.h"
#ifdef OAES_HAVE_ISAAC
#include "rand.h"
#endif // OAES_HAVE_ISAAC
#define OAES_RKEY_LEN 4
#define OAES_COL_LEN 4
#define OAES_ROUND_BASE 7
// the block is padded
#define OAES_FLAG_PAD 0x01
#ifndef min
# define min(a,b) (((a)<(b)) ? (a) : (b))
#endif /* min */
typedef struct _oaes_key
{
size_t data_len;
uint8_t *data;
size_t exp_data_len;
uint8_t *exp_data;
size_t num_keys;
size_t key_base;
} oaes_key;
typedef struct _oaes_ctx
{
#ifdef OAES_HAVE_ISAAC
randctx * rctx;
#endif // OAES_HAVE_ISAAC
#ifdef OAES_DEBUG
oaes_step_cb step_cb;
#endif // OAES_DEBUG
oaes_key * key;
OAES_OPTION options;
uint8_t iv[OAES_BLOCK_SIZE];
} oaes_ctx;
// "OAES<8-bit header version><8-bit type><16-bit options><8-bit flags><56-bit reserved>"
static uint8_t oaes_header[OAES_BLOCK_SIZE] = {
// 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f,
/*0*/ 0x4f, 0x41, 0x45, 0x53, 0x01, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
static uint8_t oaes_gf_8[] = {
0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 };
static uint8_t oaes_sub_byte_value[16][16] = {
// 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f,
/*0*/{ 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76},
/*1*/{ 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0},
/*2*/{ 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15},
/*3*/{ 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75},
/*4*/{ 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84},
/*5*/{ 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf},
/*6*/{ 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8},
/*7*/{ 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2},
/*8*/{ 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73},
/*9*/{ 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb},
/*a*/{ 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79},
/*b*/{ 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08},
/*c*/{ 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a},
/*d*/{ 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e},
/*e*/{ 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf},
/*f*/{ 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16},
};
static uint8_t oaes_inv_sub_byte_value[16][16] = {
// 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f,
/*0*/{ 0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb},
/*1*/{ 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb},
/*2*/{ 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e},
/*3*/{ 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25},
/*4*/{ 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92},
/*5*/{ 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84},
/*6*/{ 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06},
/*7*/{ 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b},
/*8*/{ 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73},
/*9*/{ 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e},
/*a*/{ 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b},
/*b*/{ 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4},
/*c*/{ 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f},
/*d*/{ 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef},
/*e*/{ 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61},
/*f*/{ 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d},
};
static uint8_t oaes_gf_mul_2[16][16] = {
// 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f,
/*0*/{ 0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12, 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e},
/*1*/{ 0x20, 0x22, 0x24, 0x26, 0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e},
/*2*/{ 0x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e, 0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e},
/*3*/{ 0x60, 0x62, 0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76, 0x78, 0x7a, 0x7c, 0x7e},
/*4*/{ 0x80, 0x82, 0x84, 0x86, 0x88, 0x8a, 0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e},
/*5*/{ 0xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0, 0xb2, 0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe},
/*6*/{ 0xc0, 0xc2, 0xc4, 0xc6, 0xc8, 0xca, 0xcc, 0xce, 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda, 0xdc, 0xde},
/*7*/{ 0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee, 0xf0, 0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe},
/*8*/{ 0x1b, 0x19, 0x1f, 0x1d, 0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d, 0x03, 0x01, 0x07, 0x05},
/*9*/{ 0x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31, 0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d, 0x23, 0x21, 0x27, 0x25},
/*a*/{ 0x5b, 0x59, 0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55, 0x4b, 0x49, 0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45},
/*b*/{ 0x7b, 0x79, 0x7f, 0x7d, 0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61, 0x67, 0x65},
/*c*/{ 0x9b, 0x99, 0x9f, 0x9d, 0x93, 0x91, 0x97, 0x95, 0x8b, 0x89, 0x8f, 0x8d, 0x83, 0x81, 0x87, 0x85},
/*d*/{ 0xbb, 0xb9, 0xbf, 0xbd, 0xb3, 0xb1, 0xb7, 0xb5, 0xab, 0xa9, 0xaf, 0xad, 0xa3, 0xa1, 0xa7, 0xa5},
/*e*/{ 0xdb, 0xd9, 0xdf, 0xdd, 0xd3, 0xd1, 0xd7, 0xd5, 0xcb, 0xc9, 0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5},
/*f*/{ 0xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, 0xeb, 0xe9, 0xef, 0xed, 0xe3, 0xe1, 0xe7, 0xe5},
};
static uint8_t oaes_gf_mul_3[16][16] = {
// 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f,
/*0*/{ 0x00, 0x03, 0x06, 0x05, 0x0c, 0x0f, 0x0a, 0x09, 0x18, 0x1b, 0x1e, 0x1d, 0x14, 0x17, 0x12, 0x11},
/*1*/{ 0x30, 0x33, 0x36, 0x35, 0x3c, 0x3f, 0x3a, 0x39, 0x28, 0x2b, 0x2e, 0x2d, 0x24, 0x27, 0x22, 0x21},
/*2*/{ 0x60, 0x63, 0x66, 0x65, 0x6c, 0x6f, 0x6a, 0x69, 0x78, 0x7b, 0x7e, 0x7d, 0x74, 0x77, 0x72, 0x71},
/*3*/{ 0x50, 0x53, 0x56, 0x55, 0x5c, 0x5f, 0x5a, 0x59, 0x48, 0x4b, 0x4e, 0x4d, 0x44, 0x47, 0x42, 0x41},
/*4*/{ 0xc0, 0xc3, 0xc6, 0xc5, 0xcc, 0xcf, 0xca, 0xc9, 0xd8, 0xdb, 0xde, 0xdd, 0xd4, 0xd7, 0xd2, 0xd1},
/*5*/{ 0xf0, 0xf3, 0xf6, 0xf5, 0xfc, 0xff, 0xfa, 0xf9, 0xe8, 0xeb, 0xee, 0xed, 0xe4, 0xe7, 0xe2, 0xe1},
/*6*/{ 0xa0, 0xa3, 0xa6, 0xa5, 0xac, 0xaf, 0xaa, 0xa9, 0xb8, 0xbb, 0xbe, 0xbd, 0xb4, 0xb7, 0xb2, 0xb1},
/*7*/{ 0x90, 0x93, 0x96, 0x95, 0x9c, 0x9f, 0x9a, 0x99, 0x88, 0x8b, 0x8e, 0x8d, 0x84, 0x87, 0x82, 0x81},
/*8*/{ 0x9b, 0x98, 0x9d, 0x9e, 0x97, 0x94, 0x91, 0x92, 0x83, 0x80, 0x85, 0x86, 0x8f, 0x8c, 0x89, 0x8a},
/*9*/{ 0xab, 0xa8, 0xad, 0xae, 0xa7, 0xa4, 0xa1, 0xa2, 0xb3, 0xb0, 0xb5, 0xb6, 0xbf, 0xbc, 0xb9, 0xba},
/*a*/{ 0xfb, 0xf8, 0xfd, 0xfe, 0xf7, 0xf4, 0xf1, 0xf2, 0xe3, 0xe0, 0xe5, 0xe6, 0xef, 0xec, 0xe9, 0xea},
/*b*/{ 0xcb, 0xc8, 0xcd, 0xce, 0xc7, 0xc4, 0xc1, 0xc2, 0xd3, 0xd0, 0xd5, 0xd6, 0xdf, 0xdc, 0xd9, 0xda},
/*c*/{ 0x5b, 0x58, 0x5d, 0x5e, 0x57, 0x54, 0x51, 0x52, 0x43, 0x40, 0x45, 0x46, 0x4f, 0x4c, 0x49, 0x4a},
/*d*/{ 0x6b, 0x68, 0x6d, 0x6e, 0x67, 0x64, 0x61, 0x62, 0x73, 0x70, 0x75, 0x76, 0x7f, 0x7c, 0x79, 0x7a},
/*e*/{ 0x3b, 0x38, 0x3d, 0x3e, 0x37, 0x34, 0x31, 0x32, 0x23, 0x20, 0x25, 0x26, 0x2f, 0x2c, 0x29, 0x2a},
/*f*/{ 0x0b, 0x08, 0x0d, 0x0e, 0x07, 0x04, 0x01, 0x02, 0x13, 0x10, 0x15, 0x16, 0x1f, 0x1c, 0x19, 0x1a},
};
static uint8_t oaes_gf_mul_9[16][16] = {
// 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f,
/*0*/{ 0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f, 0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77},
/*1*/{ 0x90, 0x99, 0x82, 0x8b, 0xb4, 0xbd, 0xa6, 0xaf, 0xd8, 0xd1, 0xca, 0xc3, 0xfc, 0xf5, 0xee, 0xe7},
/*2*/{ 0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04, 0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c},
/*3*/{ 0xab, 0xa2, 0xb9, 0xb0, 0x8f, 0x86, 0x9d, 0x94, 0xe3, 0xea, 0xf1, 0xf8, 0xc7, 0xce, 0xd5, 0xdc},
/*4*/{ 0x76, 0x7f, 0x64, 0x6d, 0x52, 0x5b, 0x40, 0x49, 0x3e, 0x37, 0x2c, 0x25, 0x1a, 0x13, 0x08, 0x01},
/*5*/{ 0xe6, 0xef, 0xf4, 0xfd, 0xc2, 0xcb, 0xd0, 0xd9, 0xae, 0xa7, 0xbc, 0xb5, 0x8a, 0x83, 0x98, 0x91},
/*6*/{ 0x4d, 0x44, 0x5f, 0x56, 0x69, 0x60, 0x7b, 0x72, 0x05, 0x0c, 0x17, 0x1e, 0x21, 0x28, 0x33, 0x3a},
/*7*/{ 0xdd, 0xd4, 0xcf, 0xc6, 0xf9, 0xf0, 0xeb, 0xe2, 0x95, 0x9c, 0x87, 0x8e, 0xb1, 0xb8, 0xa3, 0xaa},
/*8*/{ 0xec, 0xe5, 0xfe, 0xf7, 0xc8, 0xc1, 0xda, 0xd3, 0xa4, 0xad, 0xb6, 0xbf, 0x80, 0x89, 0x92, 0x9b},
/*9*/{ 0x7c, 0x75, 0x6e, 0x67, 0x58, 0x51, 0x4a, 0x43, 0x34, 0x3d, 0x26, 0x2f, 0x10, 0x19, 0x02, 0x0b},
/*a*/{ 0xd7, 0xde, 0xc5, 0xcc, 0xf3, 0xfa, 0xe1, 0xe8, 0x9f, 0x96, 0x8d, 0x84, 0xbb, 0xb2, 0xa9, 0xa0},
/*b*/{ 0x47, 0x4e, 0x55, 0x5c, 0x63, 0x6a, 0x71, 0x78, 0x0f, 0x06, 0x1d, 0x14, 0x2b, 0x22, 0x39, 0x30},
/*c*/{ 0x9a, 0x93, 0x88, 0x81, 0xbe, 0xb7, 0xac, 0xa5, 0xd2, 0xdb, 0xc0, 0xc9, 0xf6, 0xff, 0xe4, 0xed},
/*d*/{ 0x0a, 0x03, 0x18, 0x11, 0x2e, 0x27, 0x3c, 0x35, 0x42, 0x4b, 0x50, 0x59, 0x66, 0x6f, 0x74, 0x7d},
/*e*/{ 0xa1, 0xa8, 0xb3, 0xba, 0x85, 0x8c, 0x97, 0x9e, 0xe9, 0xe0, 0xfb, 0xf2, 0xcd, 0xc4, 0xdf, 0xd6},
/*f*/{ 0x31, 0x38, 0x23, 0x2a, 0x15, 0x1c, 0x07, 0x0e, 0x79, 0x70, 0x6b, 0x62, 0x5d, 0x54, 0x4f, 0x46},
};
static uint8_t oaes_gf_mul_b[16][16] = {
// 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f,
/*0*/{ 0x00, 0x0b, 0x16, 0x1d, 0x2c, 0x27, 0x3a, 0x31, 0x58, 0x53, 0x4e, 0x45, 0x74, 0x7f, 0x62, 0x69},
/*1*/{ 0xb0, 0xbb, 0xa6, 0xad, 0x9c, 0x97, 0x8a, 0x81, 0xe8, 0xe3, 0xfe, 0xf5, 0xc4, 0xcf, 0xd2, 0xd9},
/*2*/{ 0x7b, 0x70, 0x6d, 0x66, 0x57, 0x5c, 0x41, 0x4a, 0x23, 0x28, 0x35, 0x3e, 0x0f, 0x04, 0x19, 0x12},
/*3*/{ 0xcb, 0xc0, 0xdd, 0xd6, 0xe7, 0xec, 0xf1, 0xfa, 0x93, 0x98, 0x85, 0x8e, 0xbf, 0xb4, 0xa9, 0xa2},
/*4*/{ 0xf6, 0xfd, 0xe0, 0xeb, 0xda, 0xd1, 0xcc, 0xc7, 0xae, 0xa5, 0xb8, 0xb3, 0x82, 0x89, 0x94, 0x9f},
/*5*/{ 0x46, 0x4d, 0x50, 0x5b, 0x6a, 0x61, 0x7c, 0x77, 0x1e, 0x15, 0x08, 0x03, 0x32, 0x39, 0x24, 0x2f},
/*6*/{ 0x8d, 0x86, 0x9b, 0x90, 0xa1, 0xaa, 0xb7, 0xbc, 0xd5, 0xde, 0xc3, 0xc8, 0xf9, 0xf2, 0xef, 0xe4},
/*7*/{ 0x3d, 0x36, 0x2b, 0x20, 0x11, 0x1a, 0x07, 0x0c, 0x65, 0x6e, 0x73, 0x78, 0x49, 0x42, 0x5f, 0x54},
/*8*/{ 0xf7, 0xfc, 0xe1, 0xea, 0xdb, 0xd0, 0xcd, 0xc6, 0xaf, 0xa4, 0xb9, 0xb2, 0x83, 0x88, 0x95, 0x9e},
/*9*/{ 0x47, 0x4c, 0x51, 0x5a, 0x6b, 0x60, 0x7d, 0x76, 0x1f, 0x14, 0x09, 0x02, 0x33, 0x38, 0x25, 0x2e},
/*a*/{ 0x8c, 0x87, 0x9a, 0x91, 0xa0, 0xab, 0xb6, 0xbd, 0xd4, 0xdf, 0xc2, 0xc9, 0xf8, 0xf3, 0xee, 0xe5},
/*b*/{ 0x3c, 0x37, 0x2a, 0x21, 0x10, 0x1b, 0x06, 0x0d, 0x64, 0x6f, 0x72, 0x79, 0x48, 0x43, 0x5e, 0x55},
/*c*/{ 0x01, 0x0a, 0x17, 0x1c, 0x2d, 0x26, 0x3b, 0x30, 0x59, 0x52, 0x4f, 0x44, 0x75, 0x7e, 0x63, 0x68},
/*d*/{ 0xb1, 0xba, 0xa7, 0xac, 0x9d, 0x96, 0x8b, 0x80, 0xe9, 0xe2, 0xff, 0xf4, 0xc5, 0xce, 0xd3, 0xd8},
/*e*/{ 0x7a, 0x71, 0x6c, 0x67, 0x56, 0x5d, 0x40, 0x4b, 0x22, 0x29, 0x34, 0x3f, 0x0e, 0x05, 0x18, 0x13},
/*f*/{ 0xca, 0xc1, 0xdc, 0xd7, 0xe6, 0xed, 0xf0, 0xfb, 0x92, 0x99, 0x84, 0x8f, 0xbe, 0xb5, 0xa8, 0xa3},
};
static uint8_t oaes_gf_mul_d[16][16] = {
// 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f,
/*0*/{ 0x00, 0x0d, 0x1a, 0x17, 0x34, 0x39, 0x2e, 0x23, 0x68, 0x65, 0x72, 0x7f, 0x5c, 0x51, 0x46, 0x4b},
/*1*/{ 0xd0, 0xdd, 0xca, 0xc7, 0xe4, 0xe9, 0xfe, 0xf3, 0xb8, 0xb5, 0xa2, 0xaf, 0x8c, 0x81, 0x96, 0x9b},
/*2*/{ 0xbb, 0xb6, 0xa1, 0xac, 0x8f, 0x82, 0x95, 0x98, 0xd3, 0xde, 0xc9, 0xc4, 0xe7, 0xea, 0xfd, 0xf0},
/*3*/{ 0x6b, 0x66, 0x71, 0x7c, 0x5f, 0x52, 0x45, 0x48, 0x03, 0x0e, 0x19, 0x14, 0x37, 0x3a, 0x2d, 0x20},
/*4*/{ 0x6d, 0x60, 0x77, 0x7a, 0x59, 0x54, 0x43, 0x4e, 0x05, 0x08, 0x1f, 0x12, 0x31, 0x3c, 0x2b, 0x26},
/*5*/{ 0xbd, 0xb0, 0xa7, 0xaa, 0x89, 0x84, 0x93, 0x9e, 0xd5, 0xd8, 0xcf, 0xc2, 0xe1, 0xec, 0xfb, 0xf6},
/*6*/{ 0xd6, 0xdb, 0xcc, 0xc1, 0xe2, 0xef, 0xf8, 0xf5, 0xbe, 0xb3, 0xa4, 0xa9, 0x8a, 0x87, 0x90, 0x9d},
/*7*/{ 0x06, 0x0b, 0x1c, 0x11, 0x32, 0x3f, 0x28, 0x25, 0x6e, 0x63, 0x74, 0x79, 0x5a, 0x57, 0x40, 0x4d},
/*8*/{ 0xda, 0xd7, 0xc0, 0xcd, 0xee, 0xe3, 0xf4, 0xf9, 0xb2, 0xbf, 0xa8, 0xa5, 0x86, 0x8b, 0x9c, 0x91},
/*9*/{ 0x0a, 0x07, 0x10, 0x1d, 0x3e, 0x33, 0x24, 0x29, 0x62, 0x6f, 0x78, 0x75, 0x56, 0x5b, 0x4c, 0x41},
/*a*/{ 0x61, 0x6c, 0x7b, 0x76, 0x55, 0x58, 0x4f, 0x42, 0x09, 0x04, 0x13, 0x1e, 0x3d, 0x30, 0x27, 0x2a},
/*b*/{ 0xb1, 0xbc, 0xab, 0xa6, 0x85, 0x88, 0x9f, 0x92, 0xd9, 0xd4, 0xc3, 0xce, 0xed, 0xe0, 0xf7, 0xfa},
/*c*/{ 0xb7, 0xba, 0xad, 0xa0, 0x83, 0x8e, 0x99, 0x94, 0xdf, 0xd2, 0xc5, 0xc8, 0xeb, 0xe6, 0xf1, 0xfc},
/*d*/{ 0x67, 0x6a, 0x7d, 0x70, 0x53, 0x5e, 0x49, 0x44, 0x0f, 0x02, 0x15, 0x18, 0x3b, 0x36, 0x21, 0x2c},
/*e*/{ 0x0c, 0x01, 0x16, 0x1b, 0x38, 0x35, 0x22, 0x2f, 0x64, 0x69, 0x7e, 0x73, 0x50, 0x5d, 0x4a, 0x47},
/*f*/{ 0xdc, 0xd1, 0xc6, 0xcb, 0xe8, 0xe5, 0xf2, 0xff, 0xb4, 0xb9, 0xae, 0xa3, 0x80, 0x8d, 0x9a, 0x97},
};
static uint8_t oaes_gf_mul_e[16][16] = {
// 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f,
/*0*/{ 0x00, 0x0e, 0x1c, 0x12, 0x38, 0x36, 0x24, 0x2a, 0x70, 0x7e, 0x6c, 0x62, 0x48, 0x46, 0x54, 0x5a},
/*1*/{ 0xe0, 0xee, 0xfc, 0xf2, 0xd8, 0xd6, 0xc4, 0xca, 0x90, 0x9e, 0x8c, 0x82, 0xa8, 0xa6, 0xb4, 0xba},
/*2*/{ 0xdb, 0xd5, 0xc7, 0xc9, 0xe3, 0xed, 0xff, 0xf1, 0xab, 0xa5, 0xb7, 0xb9, 0x93, 0x9d, 0x8f, 0x81},
/*3*/{ 0x3b, 0x35, 0x27, 0x29, 0x03, 0x0d, 0x1f, 0x11, 0x4b, 0x45, 0x57, 0x59, 0x73, 0x7d, 0x6f, 0x61},
/*4*/{ 0xad, 0xa3, 0xb1, 0xbf, 0x95, 0x9b, 0x89, 0x87, 0xdd, 0xd3, 0xc1, 0xcf, 0xe5, 0xeb, 0xf9, 0xf7},
/*5*/{ 0x4d, 0x43, 0x51, 0x5f, 0x75, 0x7b, 0x69, 0x67, 0x3d, 0x33, 0x21, 0x2f, 0x05, 0x0b, 0x19, 0x17},
/*6*/{ 0x76, 0x78, 0x6a, 0x64, 0x4e, 0x40, 0x52, 0x5c, 0x06, 0x08, 0x1a, 0x14, 0x3e, 0x30, 0x22, 0x2c},
/*7*/{ 0x96, 0x98, 0x8a, 0x84, 0xae, 0xa0, 0xb2, 0xbc, 0xe6, 0xe8, 0xfa, 0xf4, 0xde, 0xd0, 0xc2, 0xcc},
/*8*/{ 0x41, 0x4f, 0x5d, 0x53, 0x79, 0x77, 0x65, 0x6b, 0x31, 0x3f, 0x2d, 0x23, 0x09, 0x07, 0x15, 0x1b},
/*9*/{ 0xa1, 0xaf, 0xbd, 0xb3, 0x99, 0x97, 0x85, 0x8b, 0xd1, 0xdf, 0xcd, 0xc3, 0xe9, 0xe7, 0xf5, 0xfb},
/*a*/{ 0x9a, 0x94, 0x86, 0x88, 0xa2, 0xac, 0xbe, 0xb0, 0xea, 0xe4, 0xf6, 0xf8, 0xd2, 0xdc, 0xce, 0xc0},
/*b*/{ 0x7a, 0x74, 0x66, 0x68, 0x42, 0x4c, 0x5e, 0x50, 0x0a, 0x04, 0x16, 0x18, 0x32, 0x3c, 0x2e, 0x20},
/*c*/{ 0xec, 0xe2, 0xf0, 0xfe, 0xd4, 0xda, 0xc8, 0xc6, 0x9c, 0x92, 0x80, 0x8e, 0xa4, 0xaa, 0xb8, 0xb6},
/*d*/{ 0x0c, 0x02, 0x10, 0x1e, 0x34, 0x3a, 0x28, 0x26, 0x7c, 0x72, 0x60, 0x6e, 0x44, 0x4a, 0x58, 0x56},
/*e*/{ 0x37, 0x39, 0x2b, 0x25, 0x0f, 0x01, 0x13, 0x1d, 0x47, 0x49, 0x5b, 0x55, 0x7f, 0x71, 0x63, 0x6d},
/*f*/{ 0xd7, 0xd9, 0xcb, 0xc5, 0xef, 0xe1, 0xf3, 0xfd, 0xa7, 0xa9, 0xbb, 0xb5, 0x9f, 0x91, 0x83, 0x8d},
};
static OAES_RET oaes_sub_byte( uint8_t * byte )
{
size_t _x, _y;
if( NULL == byte )
return OAES_RET_ARG1;
_x = _y = *byte;
_x &= 0x0f;
_y &= 0xf0;
_y >>= 4;
*byte = oaes_sub_byte_value[_y][_x];
return OAES_RET_SUCCESS;
}
static OAES_RET oaes_inv_sub_byte( uint8_t * byte )
{
size_t _x, _y;
if( NULL == byte )
return OAES_RET_ARG1;
_x = _y = *byte;
_x &= 0x0f;
_y &= 0xf0;
_y >>= 4;
*byte = oaes_inv_sub_byte_value[_y][_x];
return OAES_RET_SUCCESS;
}
/*static OAES_RET oaes_word_rot_right( uint8_t word[OAES_COL_LEN] )
{
uint8_t _temp[OAES_COL_LEN];
if( NULL == word )
return OAES_RET_ARG1;
memcpy( _temp + 1, word, OAES_COL_LEN - 1 );
_temp[0] = word[OAES_COL_LEN - 1];
memcpy( word, _temp, OAES_COL_LEN );
return OAES_RET_SUCCESS;
}*/
static OAES_RET oaes_word_rot_left( uint8_t word[OAES_COL_LEN] )
{
uint8_t _temp[OAES_COL_LEN];
if( NULL == word )
return OAES_RET_ARG1;
memcpy( _temp, word + 1, OAES_COL_LEN - 1 );
_temp[OAES_COL_LEN - 1] = word[0];
memcpy( word, _temp, OAES_COL_LEN );
return OAES_RET_SUCCESS;
}
static OAES_RET oaes_shift_rows( uint8_t block[OAES_BLOCK_SIZE] )
{
uint8_t _temp[OAES_BLOCK_SIZE];
if( NULL == block )
return OAES_RET_ARG1;
_temp[0x00] = block[0x00];
_temp[0x01] = block[0x05];
_temp[0x02] = block[0x0a];
_temp[0x03] = block[0x0f];
_temp[0x04] = block[0x04];
_temp[0x05] = block[0x09];
_temp[0x06] = block[0x0e];
_temp[0x07] = block[0x03];
_temp[0x08] = block[0x08];
_temp[0x09] = block[0x0d];
_temp[0x0a] = block[0x02];
_temp[0x0b] = block[0x07];
_temp[0x0c] = block[0x0c];
_temp[0x0d] = block[0x01];
_temp[0x0e] = block[0x06];
_temp[0x0f] = block[0x0b];
memcpy( block, _temp, OAES_BLOCK_SIZE );
return OAES_RET_SUCCESS;
}
static OAES_RET oaes_inv_shift_rows( uint8_t block[OAES_BLOCK_SIZE] )
{
uint8_t _temp[OAES_BLOCK_SIZE];
if( NULL == block )
return OAES_RET_ARG1;
_temp[0x00] = block[0x00];
_temp[0x01] = block[0x0d];
_temp[0x02] = block[0x0a];
_temp[0x03] = block[0x07];
_temp[0x04] = block[0x04];
_temp[0x05] = block[0x01];
_temp[0x06] = block[0x0e];
_temp[0x07] = block[0x0b];
_temp[0x08] = block[0x08];
_temp[0x09] = block[0x05];
_temp[0x0a] = block[0x02];
_temp[0x0b] = block[0x0f];
_temp[0x0c] = block[0x0c];
_temp[0x0d] = block[0x09];
_temp[0x0e] = block[0x06];
_temp[0x0f] = block[0x03];
memcpy( block, _temp, OAES_BLOCK_SIZE );
return OAES_RET_SUCCESS;
}
static uint8_t oaes_gf_mul(uint8_t left, uint8_t right)
{
size_t _x, _y;
_x = _y = left;
_x &= 0x0f;
_y &= 0xf0;
_y >>= 4;
switch( right )
{
case 0x02:
return oaes_gf_mul_2[_y][_x];
break;
case 0x03:
return oaes_gf_mul_3[_y][_x];
break;
case 0x09:
return oaes_gf_mul_9[_y][_x];
break;
case 0x0b:
return oaes_gf_mul_b[_y][_x];
break;
case 0x0d:
return oaes_gf_mul_d[_y][_x];
break;
case 0x0e:
return oaes_gf_mul_e[_y][_x];
break;
default:
return left;
break;
}
}
static OAES_RET oaes_mix_cols( uint8_t word[OAES_COL_LEN] )
{
uint8_t _temp[OAES_COL_LEN];
if( NULL == word )
return OAES_RET_ARG1;
_temp[0] = oaes_gf_mul(word[0], 0x02) ^ oaes_gf_mul( word[1], 0x03 ) ^
word[2] ^ word[3];
_temp[1] = word[0] ^ oaes_gf_mul( word[1], 0x02 ) ^
oaes_gf_mul( word[2], 0x03 ) ^ word[3];
_temp[2] = word[0] ^ word[1] ^
oaes_gf_mul( word[2], 0x02 ) ^ oaes_gf_mul( word[3], 0x03 );
_temp[3] = oaes_gf_mul( word[0], 0x03 ) ^ word[1] ^
word[2] ^ oaes_gf_mul( word[3], 0x02 );
memcpy( word, _temp, OAES_COL_LEN );
return OAES_RET_SUCCESS;
}
static OAES_RET oaes_inv_mix_cols( uint8_t word[OAES_COL_LEN] )
{
uint8_t _temp[OAES_COL_LEN];
if( NULL == word )
return OAES_RET_ARG1;
_temp[0] = oaes_gf_mul( word[0], 0x0e ) ^ oaes_gf_mul( word[1], 0x0b ) ^
oaes_gf_mul( word[2], 0x0d ) ^ oaes_gf_mul( word[3], 0x09 );
_temp[1] = oaes_gf_mul( word[0], 0x09 ) ^ oaes_gf_mul( word[1], 0x0e ) ^
oaes_gf_mul( word[2], 0x0b ) ^ oaes_gf_mul( word[3], 0x0d );
_temp[2] = oaes_gf_mul( word[0], 0x0d ) ^ oaes_gf_mul( word[1], 0x09 ) ^
oaes_gf_mul( word[2], 0x0e ) ^ oaes_gf_mul( word[3], 0x0b );
_temp[3] = oaes_gf_mul( word[0], 0x0b ) ^ oaes_gf_mul( word[1], 0x0d ) ^
oaes_gf_mul( word[2], 0x09 ) ^ oaes_gf_mul( word[3], 0x0e );
memcpy( word, _temp, OAES_COL_LEN );
return OAES_RET_SUCCESS;
}
OAES_RET oaes_sprintf(
char * buf, size_t * buf_len, const uint8_t * data, size_t data_len )
{
size_t _i, _buf_len_in;
char _temp[4];
if( NULL == buf_len )
return OAES_RET_ARG2;
_buf_len_in = *buf_len;
*buf_len = data_len * 3 + data_len / OAES_BLOCK_SIZE + 1;
if( NULL == buf )
return OAES_RET_SUCCESS;
if( *buf_len > _buf_len_in )
return OAES_RET_BUF;
if( NULL == data )
return OAES_RET_ARG3;
strcpy( buf, "" );
for( _i = 0; _i < data_len; _i++ )
{
sprintf( _temp, "%02x ", data[_i] );
strcat( buf, _temp );
if( _i && 0 == ( _i + 1 ) % OAES_BLOCK_SIZE )
strcat( buf, "\n" );
}
return OAES_RET_SUCCESS;
}
#ifdef OAES_HAVE_ISAAC
static void oaes_get_seed( char buf[RANDSIZ + 1] )
{
struct timeb timer;
struct tm *gmTimer;
char * _test = NULL;
ftime (&timer);
gmTimer = gmtime( &timer.time );
_test = (char *) calloc( sizeof( char ), timer.millitm );
sprintf( buf, "%04d%02d%02d%02d%02d%02d%03d%p%d",
gmTimer->tm_year + 1900, gmTimer->tm_mon + 1, gmTimer->tm_mday,
gmTimer->tm_hour, gmTimer->tm_min, gmTimer->tm_sec, timer.millitm,
_test + timer.millitm, getpid() );
if( _test )
free( _test );
}
#else
static uint32_t oaes_get_seed()
{
struct timeb timer;
struct tm *gmTimer;
char * _test = NULL;
uint32_t _ret = 0;
ftime (&timer);
gmTimer = gmtime( &timer.time );
_test = (char *) calloc( sizeof( char ), timer.millitm );
_ret = gmTimer->tm_year + 1900 + gmTimer->tm_mon + 1 + gmTimer->tm_mday +
gmTimer->tm_hour + gmTimer->tm_min + gmTimer->tm_sec + timer.millitm +
(uint32_t) ( _test + timer.millitm ) + getpid();
if( _test )
free( _test );
return _ret;
}
#endif // OAES_HAVE_ISAAC
static OAES_RET oaes_key_destroy( oaes_key ** key )
{
if( NULL == *key )
return OAES_RET_SUCCESS;
if( (*key)->data )
{
free( (*key)->data );
(*key)->data = NULL;
}
if( (*key)->exp_data )
{
free( (*key)->exp_data );
(*key)->exp_data = NULL;
}
(*key)->data_len = 0;
(*key)->exp_data_len = 0;
(*key)->num_keys = 0;
(*key)->key_base = 0;
free( *key );
*key = NULL;
return OAES_RET_SUCCESS;
}
static OAES_RET oaes_key_expand( OAES_CTX * ctx )
{
size_t _i, _j;
oaes_ctx * _ctx = (oaes_ctx *) ctx;
if( NULL == _ctx )
return OAES_RET_ARG1;
if( NULL == _ctx->key )
return OAES_RET_NOKEY;
_ctx->key->key_base = _ctx->key->data_len / OAES_RKEY_LEN;
_ctx->key->num_keys = _ctx->key->key_base + OAES_ROUND_BASE;
_ctx->key->exp_data_len = _ctx->key->num_keys * OAES_RKEY_LEN * OAES_COL_LEN;
_ctx->key->exp_data = (uint8_t *)
calloc( _ctx->key->exp_data_len, sizeof( uint8_t ));
if( NULL == _ctx->key->exp_data )
return OAES_RET_MEM;
// the first _ctx->key->data_len are a direct copy
memcpy( _ctx->key->exp_data, _ctx->key->data, _ctx->key->data_len );
// apply ExpandKey algorithm for remainder
for( _i = _ctx->key->key_base; _i < _ctx->key->num_keys * OAES_RKEY_LEN; _i++ )
{
uint8_t _temp[OAES_COL_LEN];
memcpy( _temp,
_ctx->key->exp_data + ( _i - 1 ) * OAES_RKEY_LEN, OAES_COL_LEN );
// transform key column
if( 0 == _i % _ctx->key->key_base )
{
oaes_word_rot_left( _temp );
for( _j = 0; _j < OAES_COL_LEN; _j++ )
oaes_sub_byte( _temp + _j );
_temp[0] = _temp[0] ^ oaes_gf_8[ _i / _ctx->key->key_base - 1 ];
}
else if( _ctx->key->key_base > 6 && 4 == _i % _ctx->key->key_base )
{
for( _j = 0; _j < OAES_COL_LEN; _j++ )
oaes_sub_byte( _temp + _j );
}
for( _j = 0; _j < OAES_COL_LEN; _j++ )
{
_ctx->key->exp_data[ _i * OAES_RKEY_LEN + _j ] =
_ctx->key->exp_data[ ( _i - _ctx->key->key_base ) *
OAES_RKEY_LEN + _j ] ^ _temp[_j];
}
}
return OAES_RET_SUCCESS;
}
static OAES_RET oaes_key_gen( OAES_CTX * ctx, size_t key_size )
{
size_t _i;
oaes_key * _key = NULL;
oaes_ctx * _ctx = (oaes_ctx *) ctx;
OAES_RET _rc = OAES_RET_SUCCESS;
if( NULL == _ctx )
return OAES_RET_ARG1;
_key = (oaes_key *) calloc( sizeof( oaes_key ), 1 );
if( NULL == _key )
return OAES_RET_MEM;
if( _ctx->key )
oaes_key_destroy( &(_ctx->key) );
_key->data_len = key_size;
_key->data = (uint8_t *) calloc( key_size, sizeof( uint8_t ));
if( NULL == _key->data )
return OAES_RET_MEM;
for( _i = 0; _i < key_size; _i++ )
#ifdef OAES_HAVE_ISAAC
_key->data[_i] = (uint8_t) rand( _ctx->rctx );
#else
_key->data[_i] = (uint8_t) rand();
#endif // OAES_HAVE_ISAAC
_ctx->key = _key;
_rc = _rc || oaes_key_expand( ctx );
if( _rc != OAES_RET_SUCCESS )
{
oaes_key_destroy( &(_ctx->key) );
return _rc;
}
return OAES_RET_SUCCESS;
}
OAES_RET oaes_key_gen_128( OAES_CTX * ctx )
{
return oaes_key_gen( ctx, 16 );
}
OAES_RET oaes_key_gen_192( OAES_CTX * ctx )
{
return oaes_key_gen( ctx, 24 );
}
OAES_RET oaes_key_gen_256( OAES_CTX * ctx )
{
return oaes_key_gen( ctx, 32 );
}
OAES_RET oaes_key_export( OAES_CTX * ctx,
uint8_t * data, size_t * data_len )
{
size_t _data_len_in;
oaes_ctx * _ctx = (oaes_ctx *) ctx;
if( NULL == _ctx )
return OAES_RET_ARG1;
if( NULL == _ctx->key )
return OAES_RET_NOKEY;
if( NULL == data_len )
return OAES_RET_ARG3;
_data_len_in = *data_len;
// data + header
*data_len = _ctx->key->data_len + OAES_BLOCK_SIZE;
if( NULL == data )
return OAES_RET_SUCCESS;
if( _data_len_in < *data_len )
return OAES_RET_BUF;
// header
memcpy( data, oaes_header, OAES_BLOCK_SIZE );
data[5] = 0x01;
data[7] = _ctx->key->data_len;
memcpy( data + OAES_BLOCK_SIZE, _ctx->key->data, _ctx->key->data_len );
return OAES_RET_SUCCESS;
}
OAES_RET oaes_key_export_data( OAES_CTX * ctx,
uint8_t * data, size_t * data_len )
{
size_t _data_len_in;
oaes_ctx * _ctx = (oaes_ctx *) ctx;
if( NULL == _ctx )
return OAES_RET_ARG1;
if( NULL == _ctx->key )
return OAES_RET_NOKEY;
if( NULL == data_len )
return OAES_RET_ARG3;
_data_len_in = *data_len;
*data_len = _ctx->key->data_len;
if( NULL == data )
return OAES_RET_SUCCESS;
if( _data_len_in < *data_len )
return OAES_RET_BUF;
memcpy( data, _ctx->key->data, *data_len );
return OAES_RET_SUCCESS;
}
OAES_RET oaes_key_import( OAES_CTX * ctx,
const uint8_t * data, size_t data_len )
{
oaes_ctx * _ctx = (oaes_ctx *) ctx;
OAES_RET _rc = OAES_RET_SUCCESS;
int _key_length;
if( NULL == _ctx )
return OAES_RET_ARG1;
if( NULL == data )
return OAES_RET_ARG2;
switch( data_len )
{
case 16 + OAES_BLOCK_SIZE:
case 24 + OAES_BLOCK_SIZE:
case 32 + OAES_BLOCK_SIZE:
break;
default:
return OAES_RET_ARG3;
}
// header
if( 0 != memcmp( data, oaes_header, 4 ) )
return OAES_RET_HEADER;
// header version
switch( data[4] )
{
case 0x01:
break;
default:
return OAES_RET_HEADER;
}
// header type
switch( data[5] )
{
case 0x01:
break;
default:
return OAES_RET_HEADER;
}
// options
_key_length = data[7];
switch( _key_length )
{
case 16:
case 24:
case 32:
break;
default:
return OAES_RET_HEADER;
}
if( data_len != (size_t)_key_length + OAES_BLOCK_SIZE )
return OAES_RET_ARG3;
if( _ctx->key )
oaes_key_destroy( &(_ctx->key) );
_ctx->key = (oaes_key *) calloc( sizeof( oaes_key ), 1 );
if( NULL == _ctx->key )
return OAES_RET_MEM;
_ctx->key->data_len = _key_length;
_ctx->key->data = (uint8_t *)
calloc( _key_length, sizeof( uint8_t ));
if( NULL == _ctx->key->data )
{
oaes_key_destroy( &(_ctx->key) );
return OAES_RET_MEM;
}
memcpy( _ctx->key->data, data + OAES_BLOCK_SIZE, _key_length );
_rc = _rc || oaes_key_expand( ctx );
if( _rc != OAES_RET_SUCCESS )
{
oaes_key_destroy( &(_ctx->key) );
return _rc;
}
return OAES_RET_SUCCESS;
}
OAES_RET oaes_key_import_data( OAES_CTX * ctx,
const uint8_t * data, size_t data_len )
{
oaes_ctx * _ctx = (oaes_ctx *) ctx;
OAES_RET _rc = OAES_RET_SUCCESS;
if( NULL == _ctx )
return OAES_RET_ARG1;
if( NULL == data )
return OAES_RET_ARG2;
switch( data_len )
{
case 16:
case 24:
case 32:
break;
default:
return OAES_RET_ARG3;
}
if( _ctx->key )
oaes_key_destroy( &(_ctx->key) );
_ctx->key = (oaes_key *) calloc( sizeof( oaes_key ), 1 );
if( NULL == _ctx->key )
return OAES_RET_MEM;
_ctx->key->data_len = data_len;
_ctx->key->data = (uint8_t *)
calloc( data_len, sizeof( uint8_t ));
if( NULL == _ctx->key->data )
{
oaes_key_destroy( &(_ctx->key) );
return OAES_RET_MEM;
}
memcpy( _ctx->key->data, data, data_len );
_rc = _rc || oaes_key_expand( ctx );
if( _rc != OAES_RET_SUCCESS )
{
oaes_key_destroy( &(_ctx->key) );
return _rc;
}
return OAES_RET_SUCCESS;
}
OAES_CTX * oaes_alloc()
{
oaes_ctx * _ctx = (oaes_ctx *) calloc( sizeof( oaes_ctx ), 1 );
if( NULL == _ctx )
return NULL;
#ifdef OAES_HAVE_ISAAC
{
char _seed[RANDSIZ + 1];
_ctx->rctx = (randctx *) calloc( sizeof( randctx ), 1 );
if( NULL == _ctx->rctx )
{
free( _ctx );
return NULL;
}
oaes_get_seed( _seed );
memset( _ctx->rctx->randrsl, 0, RANDSIZ );
memcpy( _ctx->rctx->randrsl, _seed, RANDSIZ );
randinit( _ctx->rctx, TRUE);
}
#else
srand( oaes_get_seed() );
#endif // OAES_HAVE_ISAAC
_ctx->key = NULL;
oaes_set_option( _ctx, OAES_OPTION_CBC, NULL );
#ifdef OAES_DEBUG
_ctx->step_cb = NULL;
oaes_set_option( _ctx, OAES_OPTION_STEP_OFF, NULL );
#endif // OAES_DEBUG
return (OAES_CTX *) _ctx;
}
OAES_RET oaes_free( OAES_CTX ** ctx )
{
oaes_ctx ** _ctx = (oaes_ctx **) ctx;
if( NULL == _ctx )
return OAES_RET_ARG1;
if( NULL == *_ctx )
return OAES_RET_SUCCESS;
if( (*_ctx)->key )
oaes_key_destroy( &((*_ctx)->key) );
#ifdef OAES_HAVE_ISAAC
if( (*_ctx)->rctx )
{
free( (*_ctx)->rctx );
(*_ctx)->rctx = NULL;
}
#endif // OAES_HAVE_ISAAC
free( *_ctx );
*_ctx = NULL;
return OAES_RET_SUCCESS;
}
OAES_RET oaes_set_option( OAES_CTX * ctx,
OAES_OPTION option, const void * value )
{
size_t _i;
oaes_ctx * _ctx = (oaes_ctx *) ctx;
if( NULL == _ctx )
return OAES_RET_ARG1;
switch( option )
{
case OAES_OPTION_ECB:
_ctx->options &= ~OAES_OPTION_CBC;
memset( _ctx->iv, 0, OAES_BLOCK_SIZE );
break;
case OAES_OPTION_CBC:
_ctx->options &= ~OAES_OPTION_ECB;
if( value )
memcpy( _ctx->iv, value, OAES_BLOCK_SIZE );
else
{
for( _i = 0; _i < OAES_BLOCK_SIZE; _i++ )
#ifdef OAES_HAVE_ISAAC
_ctx->iv[_i] = (uint8_t) rand( _ctx->rctx );
#else
_ctx->iv[_i] = (uint8_t) rand();
#endif // OAES_HAVE_ISAAC
}
break;
#ifdef OAES_DEBUG
case OAES_OPTION_STEP_ON:
if( value )
{
_ctx->options &= ~OAES_OPTION_STEP_OFF;
_ctx->step_cb = value;
}
else
{
_ctx->options &= ~OAES_OPTION_STEP_ON;
_ctx->options |= OAES_OPTION_STEP_OFF;
_ctx->step_cb = NULL;
return OAES_RET_ARG3;
}
break;
case OAES_OPTION_STEP_OFF:
_ctx->options &= ~OAES_OPTION_STEP_ON;
_ctx->step_cb = NULL;
break;
#endif // OAES_DEBUG
default:
return OAES_RET_ARG2;
}
_ctx->options |= option;
return OAES_RET_SUCCESS;
}
static OAES_RET oaes_encrypt_block(
OAES_CTX * ctx, uint8_t * c, size_t c_len )
{
size_t _i, _j;
oaes_ctx * _ctx = (oaes_ctx *) ctx;
if( NULL == _ctx )
return OAES_RET_ARG1;
if( NULL == c )
return OAES_RET_ARG2;
if( c_len != OAES_BLOCK_SIZE )
return OAES_RET_ARG3;
if( NULL == _ctx->key )
return OAES_RET_NOKEY;
#ifdef OAES_DEBUG
if( _ctx->step_cb )
_ctx->step_cb( c, "input", 1, NULL );
#endif // OAES_DEBUG
// AddRoundKey(State, K0)
for( _i = 0; _i < c_len; _i++ )
c[_i] = c[_i] ^ _ctx->key->exp_data[_i];
#ifdef OAES_DEBUG
if( _ctx->step_cb )
{
_ctx->step_cb( _ctx->key->exp_data, "k_sch", 1, NULL );
_ctx->step_cb( c, "k_add", 1, NULL );
}
#endif // OAES_DEBUG
// for round = 1 step 1 to Nr–1
for( _i = 1; _i < _ctx->key->num_keys - 1; _i++ )
{
// SubBytes(state)
for( _j = 0; _j < c_len; _j++ )
oaes_sub_byte( c + _j );
#ifdef OAES_DEBUG
if( _ctx->step_cb )
_ctx->step_cb( c, "s_box", _i, NULL );
#endif // OAES_DEBUG
// ShiftRows(state)
oaes_shift_rows( c );
#ifdef OAES_DEBUG
if( _ctx->step_cb )
_ctx->step_cb( c, "s_row", _i, NULL );
#endif // OAES_DEBUG
// MixColumns(state)
oaes_mix_cols( c );
oaes_mix_cols( c + 4 );
oaes_mix_cols( c + 8 );
oaes_mix_cols( c + 12 );
#ifdef OAES_DEBUG
if( _ctx->step_cb )
_ctx->step_cb( c, "m_col", _i, NULL );
#endif // OAES_DEBUG
// AddRoundKey(state, w[round*Nb, (round+1)*Nb-1])
for( _j = 0; _j < c_len; _j++ )
c[_j] = c[_j] ^
_ctx->key->exp_data[_i * OAES_RKEY_LEN * OAES_COL_LEN + _j];
#ifdef OAES_DEBUG
if( _ctx->step_cb )
{
_ctx->step_cb( _ctx->key->exp_data + _i * OAES_RKEY_LEN * OAES_COL_LEN,
"k_sch", _i, NULL );
_ctx->step_cb( c, "k_add", _i, NULL );
}
#endif // OAES_DEBUG
}
// SubBytes(state)
for( _i = 0; _i < c_len; _i++ )
oaes_sub_byte( c + _i );
#ifdef OAES_DEBUG
if( _ctx->step_cb )
_ctx->step_cb( c, "s_box", _ctx->key->num_keys - 1, NULL );
#endif // OAES_DEBUG
// ShiftRows(state)
oaes_shift_rows( c );
#ifdef OAES_DEBUG
if( _ctx->step_cb )
_ctx->step_cb( c, "s_row", _ctx->key->num_keys - 1, NULL );
#endif // OAES_DEBUG
// AddRoundKey(state, w[Nr*Nb, (Nr+1)*Nb-1])
for( _i = 0; _i < c_len; _i++ )
c[_i] = c[_i] ^ _ctx->key->exp_data[
( _ctx->key->num_keys - 1 ) * OAES_RKEY_LEN * OAES_COL_LEN + _i ];
#ifdef OAES_DEBUG
if( _ctx->step_cb )
{
_ctx->step_cb( _ctx->key->exp_data +
( _ctx->key->num_keys - 1 ) * OAES_RKEY_LEN * OAES_COL_LEN,
"k_sch", _ctx->key->num_keys - 1, NULL );
_ctx->step_cb( c, "output", _ctx->key->num_keys - 1, NULL );
}
#endif // OAES_DEBUG
return OAES_RET_SUCCESS;
}
static OAES_RET oaes_decrypt_block(
OAES_CTX * ctx, uint8_t * c, size_t c_len )
{
size_t _i, _j;
oaes_ctx * _ctx = (oaes_ctx *) ctx;
if( NULL == _ctx )
return OAES_RET_ARG1;
if( NULL == c )
return OAES_RET_ARG2;
if( c_len != OAES_BLOCK_SIZE )
return OAES_RET_ARG3;
if( NULL == _ctx->key )
return OAES_RET_NOKEY;
#ifdef OAES_DEBUG
if( _ctx->step_cb )
_ctx->step_cb( c, "iinput", _ctx->key->num_keys - 1, NULL );
#endif // OAES_DEBUG
// AddRoundKey(state, w[Nr*Nb, (Nr+1)*Nb-1])
for( _i = 0; _i < c_len; _i++ )
c[_i] = c[_i] ^ _ctx->key->exp_data[
( _ctx->key->num_keys - 1 ) * OAES_RKEY_LEN * OAES_COL_LEN + _i ];
#ifdef OAES_DEBUG
if( _ctx->step_cb )
{
_ctx->step_cb( _ctx->key->exp_data +
( _ctx->key->num_keys - 1 ) * OAES_RKEY_LEN * OAES_COL_LEN,
"ik_sch", _ctx->key->num_keys - 1, NULL );
_ctx->step_cb( c, "ik_add", _ctx->key->num_keys - 1, NULL );
}
#endif // OAES_DEBUG
for( _i = _ctx->key->num_keys - 2; _i > 0; _i-- )
{
// InvShiftRows(state)
oaes_inv_shift_rows( c );
#ifdef OAES_DEBUG
if( _ctx->step_cb )
_ctx->step_cb( c, "is_row", _i, NULL );
#endif // OAES_DEBUG
// InvSubBytes(state)
for( _j = 0; _j < c_len; _j++ )
oaes_inv_sub_byte( c + _j );
#ifdef OAES_DEBUG
if( _ctx->step_cb )
_ctx->step_cb( c, "is_box", _i, NULL );
#endif // OAES_DEBUG
// AddRoundKey(state, w[round*Nb, (round+1)*Nb-1])
for( _j = 0; _j < c_len; _j++ )
c[_j] = c[_j] ^
_ctx->key->exp_data[_i * OAES_RKEY_LEN * OAES_COL_LEN + _j];
#ifdef OAES_DEBUG
if( _ctx->step_cb )
{
_ctx->step_cb( _ctx->key->exp_data + _i * OAES_RKEY_LEN * OAES_COL_LEN,
"ik_sch", _i, NULL );
_ctx->step_cb( c, "ik_add", _i, NULL );
}
#endif // OAES_DEBUG
// InvMixColums(state)
oaes_inv_mix_cols( c );
oaes_inv_mix_cols( c + 4 );
oaes_inv_mix_cols( c + 8 );
oaes_inv_mix_cols( c + 12 );
#ifdef OAES_DEBUG
if( _ctx->step_cb )
_ctx->step_cb( c, "im_col", _i, NULL );
#endif // OAES_DEBUG
}
// InvShiftRows(state)
oaes_inv_shift_rows( c );
#ifdef OAES_DEBUG
if( _ctx->step_cb )
_ctx->step_cb( c, "is_row", 1, NULL );
#endif // OAES_DEBUG
// InvSubBytes(state)
for( _i = 0; _i < c_len; _i++ )
oaes_inv_sub_byte( c + _i );
#ifdef OAES_DEBUG
if( _ctx->step_cb )
_ctx->step_cb( c, "is_box", 1, NULL );
#endif // OAES_DEBUG
// AddRoundKey(state, w[0, Nb-1])
for( _i = 0; _i < c_len; _i++ )
c[_i] = c[_i] ^ _ctx->key->exp_data[_i];
#ifdef OAES_DEBUG
if( _ctx->step_cb )
{
_ctx->step_cb( _ctx->key->exp_data, "ik_sch", 1, NULL );
_ctx->step_cb( c, "ioutput", 1, NULL );
}
#endif // OAES_DEBUG
return OAES_RET_SUCCESS;
}
OAES_RET oaes_encrypt( OAES_CTX * ctx,
const uint8_t * m, size_t m_len, uint8_t * c, size_t * c_len )
{
size_t _i, _j, _c_len_in, _c_data_len;
size_t _pad_len = m_len % OAES_BLOCK_SIZE == 0 ?
0 : OAES_BLOCK_SIZE - m_len % OAES_BLOCK_SIZE;
oaes_ctx * _ctx = (oaes_ctx *) ctx;
OAES_RET _rc = OAES_RET_SUCCESS;
uint8_t _flags = _pad_len ? OAES_FLAG_PAD : 0;
if( NULL == _ctx )
return OAES_RET_ARG1;
if( NULL == m )
return OAES_RET_ARG2;
if( NULL == c_len )
return OAES_RET_ARG5;
_c_len_in = *c_len;
// data + pad
_c_data_len = m_len + _pad_len;
// header + iv + data + pad
*c_len = 2 * OAES_BLOCK_SIZE + m_len + _pad_len;
if( NULL == c )
return OAES_RET_SUCCESS;
if( _c_len_in < *c_len )
return OAES_RET_BUF;
if( NULL == _ctx->key )
return OAES_RET_NOKEY;
// header
memcpy(c, oaes_header, OAES_BLOCK_SIZE );
memcpy(c + 6, &_ctx->options, sizeof(_ctx->options));
memcpy(c + 8, &_flags, sizeof(_flags));
// iv
memcpy(c + OAES_BLOCK_SIZE, _ctx->iv, OAES_BLOCK_SIZE );
// data
memcpy(c + 2 * OAES_BLOCK_SIZE, m, m_len );
for( _i = 0; _i < _c_data_len; _i += OAES_BLOCK_SIZE )
{
uint8_t _block[OAES_BLOCK_SIZE];
size_t _block_size = min( m_len - _i, OAES_BLOCK_SIZE );
memcpy( _block, c + 2 * OAES_BLOCK_SIZE + _i, _block_size );
// insert pad
for( _j = 0; _j < OAES_BLOCK_SIZE - _block_size; _j++ )
_block[ _block_size + _j ] = _j + 1;
// CBC
if( _ctx->options & OAES_OPTION_CBC )
{
for( _j = 0; _j < OAES_BLOCK_SIZE; _j++ )
_block[_j] = _block[_j] ^ _ctx->iv[_j];
}
_rc = _rc ||
oaes_encrypt_block( ctx, _block, OAES_BLOCK_SIZE );
memcpy( c + 2 * OAES_BLOCK_SIZE + _i, _block, OAES_BLOCK_SIZE );
if( _ctx->options & OAES_OPTION_CBC )
memcpy( _ctx->iv, _block, OAES_BLOCK_SIZE );
}
return _rc;
}
OAES_RET oaes_decrypt( OAES_CTX * ctx,
const uint8_t * c, size_t c_len, uint8_t * m, size_t * m_len )
{
size_t _i, _j, _m_len_in;
oaes_ctx * _ctx = (oaes_ctx *) ctx;
OAES_RET _rc = OAES_RET_SUCCESS;
uint8_t _iv[OAES_BLOCK_SIZE];
uint8_t _flags;
OAES_OPTION _options;
if( NULL == ctx )
return OAES_RET_ARG1;
if( NULL == c )
return OAES_RET_ARG2;
if( c_len % OAES_BLOCK_SIZE )
return OAES_RET_ARG3;
if( NULL == m_len )
return OAES_RET_ARG5;
_m_len_in = *m_len;
*m_len = c_len - 2 * OAES_BLOCK_SIZE;
if( NULL == m )
return OAES_RET_SUCCESS;
if( _m_len_in < *m_len )
return OAES_RET_BUF;
if( NULL == _ctx->key )
return OAES_RET_NOKEY;
// header
if( 0 != memcmp( c, oaes_header, 4 ) )
return OAES_RET_HEADER;
// header version
switch( c[4] )
{
case 0x01:
break;
default:
return OAES_RET_HEADER;
}
// header type
switch( c[5] )
{
case 0x02:
break;
default:
return OAES_RET_HEADER;
}
// options
memcpy(&_options, c + 6, sizeof(_options));
// validate that all options are valid
if( _options & ~(
OAES_OPTION_ECB
| OAES_OPTION_CBC
#ifdef OAES_DEBUG
| OAES_OPTION_STEP_ON
| OAES_OPTION_STEP_OFF
#endif // OAES_DEBUG
) )
return OAES_RET_HEADER;
if( ( _options & OAES_OPTION_ECB ) &&
( _options & OAES_OPTION_CBC ) )
return OAES_RET_HEADER;
if( _options == OAES_OPTION_NONE )
return OAES_RET_HEADER;
// flags
memcpy(&_flags, c + 8, sizeof(_flags));
// validate that all flags are valid
if( _flags & ~(
OAES_FLAG_PAD
) )
return OAES_RET_HEADER;
// iv
memcpy( _iv, c + OAES_BLOCK_SIZE, OAES_BLOCK_SIZE);
// data + pad
memcpy( m, c + 2 * OAES_BLOCK_SIZE, *m_len );
for( _i = 0; _i < *m_len; _i += OAES_BLOCK_SIZE )
{
if( ( _options & OAES_OPTION_CBC ) && _i > 0 )
memcpy( _iv, c + OAES_BLOCK_SIZE + _i, OAES_BLOCK_SIZE );
_rc = _rc ||
oaes_decrypt_block( ctx, m + _i, min( *m_len - _i, OAES_BLOCK_SIZE ) );
// CBC
if( _options & OAES_OPTION_CBC )
{
for( _j = 0; _j < OAES_BLOCK_SIZE; _j++ )
m[ _i + _j ] = m[ _i + _j ] ^ _iv[_j];
}
}
// remove pad
if( _flags & OAES_FLAG_PAD )
{
int _is_pad = 1;
size_t _temp = (size_t) m[*m_len - 1];
if( _temp <= 0x00 || _temp > 0x0f )
return OAES_RET_HEADER;
for( _i = 0; _i < _temp; _i++ )
if( m[*m_len - 1 - _i] != _temp - _i )
_is_pad = 0;
if( _is_pad )
{
memset( m + *m_len - _temp, 0, _temp );
*m_len -= _temp;
}
else
return OAES_RET_HEADER;
}
return OAES_RET_SUCCESS;
}
