Dees_Troy | 83bd483 | 2013-05-04 12:39:56 +0000 | [diff] [blame] | 1 | /* |
| 2 | * --------------------------------------------------------------------------- |
| 3 | * OpenAES License |
| 4 | * --------------------------------------------------------------------------- |
| 5 | * Copyright (c) 2012, Nabil S. Al Ramli, www.nalramli.com |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions are met: |
| 10 | * |
| 11 | * - Redistributions of source code must retain the above copyright notice, |
| 12 | * this list of conditions and the following disclaimer. |
| 13 | * - Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 18 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| 21 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 22 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 23 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 24 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 25 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 26 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 27 | * POSSIBILITY OF SUCH DAMAGE. |
| 28 | * --------------------------------------------------------------------------- |
| 29 | */ |
| 30 | static const char _NR[] = { |
| 31 | 0x4e,0x61,0x62,0x69,0x6c,0x20,0x53,0x2e,0x20, |
| 32 | 0x41,0x6c,0x20,0x52,0x61,0x6d,0x6c,0x69,0x00 }; |
| 33 | |
| 34 | #include <stddef.h> |
| 35 | #include <time.h> |
Ethan Yonker | 6c41bfd | 2014-11-08 15:12:25 -0600 | [diff] [blame] | 36 | //#include <sys/timeb.h> |
| 37 | #include "ftime.h" |
Dees_Troy | 83bd483 | 2013-05-04 12:39:56 +0000 | [diff] [blame] | 38 | #include <malloc.h> |
| 39 | #include <string.h> |
Ethan Yonker | c798c9c | 2015-10-09 11:15:26 -0500 | [diff] [blame^] | 40 | #include <unistd.h> |
Dees_Troy | 83bd483 | 2013-05-04 12:39:56 +0000 | [diff] [blame] | 41 | |
| 42 | #ifdef WIN32 |
| 43 | #include <process.h> |
| 44 | #endif |
| 45 | |
| 46 | #include "oaes_config.h" |
| 47 | #include "oaes_lib.h" |
| 48 | |
| 49 | #ifdef OAES_HAVE_ISAAC |
| 50 | #include "rand.h" |
| 51 | #endif // OAES_HAVE_ISAAC |
| 52 | |
| 53 | #define OAES_RKEY_LEN 4 |
| 54 | #define OAES_COL_LEN 4 |
| 55 | #define OAES_ROUND_BASE 7 |
| 56 | |
| 57 | // the block is padded |
| 58 | #define OAES_FLAG_PAD 0x01 |
| 59 | |
| 60 | #ifndef min |
| 61 | # define min(a,b) (((a)<(b)) ? (a) : (b)) |
| 62 | #endif /* min */ |
| 63 | |
| 64 | typedef struct _oaes_key |
| 65 | { |
| 66 | size_t data_len; |
| 67 | uint8_t *data; |
| 68 | size_t exp_data_len; |
| 69 | uint8_t *exp_data; |
| 70 | size_t num_keys; |
| 71 | size_t key_base; |
| 72 | } oaes_key; |
| 73 | |
| 74 | typedef struct _oaes_ctx |
| 75 | { |
| 76 | #ifdef OAES_HAVE_ISAAC |
| 77 | randctx * rctx; |
| 78 | #endif // OAES_HAVE_ISAAC |
| 79 | |
| 80 | #ifdef OAES_DEBUG |
| 81 | oaes_step_cb step_cb; |
| 82 | #endif // OAES_DEBUG |
| 83 | |
| 84 | oaes_key * key; |
| 85 | OAES_OPTION options; |
| 86 | uint8_t iv[OAES_BLOCK_SIZE]; |
| 87 | } oaes_ctx; |
| 88 | |
| 89 | // "OAES<8-bit header version><8-bit type><16-bit options><8-bit flags><56-bit reserved>" |
| 90 | static uint8_t oaes_header[OAES_BLOCK_SIZE] = { |
| 91 | // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, |
| 92 | /*0*/ 0x4f, 0x41, 0x45, 0x53, 0x01, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 93 | }; |
| 94 | static uint8_t oaes_gf_8[] = { |
| 95 | 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 }; |
| 96 | |
| 97 | static uint8_t oaes_sub_byte_value[16][16] = { |
| 98 | // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, |
| 99 | /*0*/ 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, |
| 100 | /*1*/ 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, |
| 101 | /*2*/ 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, |
| 102 | /*3*/ 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, |
| 103 | /*4*/ 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, |
| 104 | /*5*/ 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, |
| 105 | /*6*/ 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, |
| 106 | /*7*/ 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, |
| 107 | /*8*/ 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, |
| 108 | /*9*/ 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, |
| 109 | /*a*/ 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, |
| 110 | /*b*/ 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, |
| 111 | /*c*/ 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, |
| 112 | /*d*/ 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, |
| 113 | /*e*/ 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, |
| 114 | /*f*/ 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16, |
| 115 | }; |
| 116 | |
| 117 | static uint8_t oaes_inv_sub_byte_value[16][16] = { |
| 118 | // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, |
| 119 | /*0*/ 0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb, |
| 120 | /*1*/ 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, |
| 121 | /*2*/ 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, |
| 122 | /*3*/ 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, |
| 123 | /*4*/ 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92, |
| 124 | /*5*/ 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84, |
| 125 | /*6*/ 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, |
| 126 | /*7*/ 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, |
| 127 | /*8*/ 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73, |
| 128 | /*9*/ 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e, |
| 129 | /*a*/ 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, |
| 130 | /*b*/ 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4, |
| 131 | /*c*/ 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, |
| 132 | /*d*/ 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef, |
| 133 | /*e*/ 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, |
| 134 | /*f*/ 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d, |
| 135 | }; |
| 136 | |
| 137 | static uint8_t oaes_gf_mul_2[16][16] = { |
| 138 | // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, |
| 139 | /*0*/ 0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12, 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e, |
| 140 | /*1*/ 0x20, 0x22, 0x24, 0x26, 0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e, |
| 141 | /*2*/ 0x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e, 0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e, |
| 142 | /*3*/ 0x60, 0x62, 0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76, 0x78, 0x7a, 0x7c, 0x7e, |
| 143 | /*4*/ 0x80, 0x82, 0x84, 0x86, 0x88, 0x8a, 0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e, |
| 144 | /*5*/ 0xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0, 0xb2, 0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe, |
| 145 | /*6*/ 0xc0, 0xc2, 0xc4, 0xc6, 0xc8, 0xca, 0xcc, 0xce, 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda, 0xdc, 0xde, |
| 146 | /*7*/ 0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee, 0xf0, 0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe, |
| 147 | /*8*/ 0x1b, 0x19, 0x1f, 0x1d, 0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d, 0x03, 0x01, 0x07, 0x05, |
| 148 | /*9*/ 0x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31, 0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d, 0x23, 0x21, 0x27, 0x25, |
| 149 | /*a*/ 0x5b, 0x59, 0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55, 0x4b, 0x49, 0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45, |
| 150 | /*b*/ 0x7b, 0x79, 0x7f, 0x7d, 0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61, 0x67, 0x65, |
| 151 | /*c*/ 0x9b, 0x99, 0x9f, 0x9d, 0x93, 0x91, 0x97, 0x95, 0x8b, 0x89, 0x8f, 0x8d, 0x83, 0x81, 0x87, 0x85, |
| 152 | /*d*/ 0xbb, 0xb9, 0xbf, 0xbd, 0xb3, 0xb1, 0xb7, 0xb5, 0xab, 0xa9, 0xaf, 0xad, 0xa3, 0xa1, 0xa7, 0xa5, |
| 153 | /*e*/ 0xdb, 0xd9, 0xdf, 0xdd, 0xd3, 0xd1, 0xd7, 0xd5, 0xcb, 0xc9, 0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5, |
| 154 | /*f*/ 0xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, 0xeb, 0xe9, 0xef, 0xed, 0xe3, 0xe1, 0xe7, 0xe5, |
| 155 | }; |
| 156 | |
| 157 | static uint8_t oaes_gf_mul_3[16][16] = { |
| 158 | // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, |
| 159 | /*0*/ 0x00, 0x03, 0x06, 0x05, 0x0c, 0x0f, 0x0a, 0x09, 0x18, 0x1b, 0x1e, 0x1d, 0x14, 0x17, 0x12, 0x11, |
| 160 | /*1*/ 0x30, 0x33, 0x36, 0x35, 0x3c, 0x3f, 0x3a, 0x39, 0x28, 0x2b, 0x2e, 0x2d, 0x24, 0x27, 0x22, 0x21, |
| 161 | /*2*/ 0x60, 0x63, 0x66, 0x65, 0x6c, 0x6f, 0x6a, 0x69, 0x78, 0x7b, 0x7e, 0x7d, 0x74, 0x77, 0x72, 0x71, |
| 162 | /*3*/ 0x50, 0x53, 0x56, 0x55, 0x5c, 0x5f, 0x5a, 0x59, 0x48, 0x4b, 0x4e, 0x4d, 0x44, 0x47, 0x42, 0x41, |
| 163 | /*4*/ 0xc0, 0xc3, 0xc6, 0xc5, 0xcc, 0xcf, 0xca, 0xc9, 0xd8, 0xdb, 0xde, 0xdd, 0xd4, 0xd7, 0xd2, 0xd1, |
| 164 | /*5*/ 0xf0, 0xf3, 0xf6, 0xf5, 0xfc, 0xff, 0xfa, 0xf9, 0xe8, 0xeb, 0xee, 0xed, 0xe4, 0xe7, 0xe2, 0xe1, |
| 165 | /*6*/ 0xa0, 0xa3, 0xa6, 0xa5, 0xac, 0xaf, 0xaa, 0xa9, 0xb8, 0xbb, 0xbe, 0xbd, 0xb4, 0xb7, 0xb2, 0xb1, |
| 166 | /*7*/ 0x90, 0x93, 0x96, 0x95, 0x9c, 0x9f, 0x9a, 0x99, 0x88, 0x8b, 0x8e, 0x8d, 0x84, 0x87, 0x82, 0x81, |
| 167 | /*8*/ 0x9b, 0x98, 0x9d, 0x9e, 0x97, 0x94, 0x91, 0x92, 0x83, 0x80, 0x85, 0x86, 0x8f, 0x8c, 0x89, 0x8a, |
| 168 | /*9*/ 0xab, 0xa8, 0xad, 0xae, 0xa7, 0xa4, 0xa1, 0xa2, 0xb3, 0xb0, 0xb5, 0xb6, 0xbf, 0xbc, 0xb9, 0xba, |
| 169 | /*a*/ 0xfb, 0xf8, 0xfd, 0xfe, 0xf7, 0xf4, 0xf1, 0xf2, 0xe3, 0xe0, 0xe5, 0xe6, 0xef, 0xec, 0xe9, 0xea, |
| 170 | /*b*/ 0xcb, 0xc8, 0xcd, 0xce, 0xc7, 0xc4, 0xc1, 0xc2, 0xd3, 0xd0, 0xd5, 0xd6, 0xdf, 0xdc, 0xd9, 0xda, |
| 171 | /*c*/ 0x5b, 0x58, 0x5d, 0x5e, 0x57, 0x54, 0x51, 0x52, 0x43, 0x40, 0x45, 0x46, 0x4f, 0x4c, 0x49, 0x4a, |
| 172 | /*d*/ 0x6b, 0x68, 0x6d, 0x6e, 0x67, 0x64, 0x61, 0x62, 0x73, 0x70, 0x75, 0x76, 0x7f, 0x7c, 0x79, 0x7a, |
| 173 | /*e*/ 0x3b, 0x38, 0x3d, 0x3e, 0x37, 0x34, 0x31, 0x32, 0x23, 0x20, 0x25, 0x26, 0x2f, 0x2c, 0x29, 0x2a, |
| 174 | /*f*/ 0x0b, 0x08, 0x0d, 0x0e, 0x07, 0x04, 0x01, 0x02, 0x13, 0x10, 0x15, 0x16, 0x1f, 0x1c, 0x19, 0x1a, |
| 175 | }; |
| 176 | |
| 177 | static uint8_t oaes_gf_mul_9[16][16] = { |
| 178 | // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, |
| 179 | /*0*/ 0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f, 0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77, |
| 180 | /*1*/ 0x90, 0x99, 0x82, 0x8b, 0xb4, 0xbd, 0xa6, 0xaf, 0xd8, 0xd1, 0xca, 0xc3, 0xfc, 0xf5, 0xee, 0xe7, |
| 181 | /*2*/ 0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04, 0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c, |
| 182 | /*3*/ 0xab, 0xa2, 0xb9, 0xb0, 0x8f, 0x86, 0x9d, 0x94, 0xe3, 0xea, 0xf1, 0xf8, 0xc7, 0xce, 0xd5, 0xdc, |
| 183 | /*4*/ 0x76, 0x7f, 0x64, 0x6d, 0x52, 0x5b, 0x40, 0x49, 0x3e, 0x37, 0x2c, 0x25, 0x1a, 0x13, 0x08, 0x01, |
| 184 | /*5*/ 0xe6, 0xef, 0xf4, 0xfd, 0xc2, 0xcb, 0xd0, 0xd9, 0xae, 0xa7, 0xbc, 0xb5, 0x8a, 0x83, 0x98, 0x91, |
| 185 | /*6*/ 0x4d, 0x44, 0x5f, 0x56, 0x69, 0x60, 0x7b, 0x72, 0x05, 0x0c, 0x17, 0x1e, 0x21, 0x28, 0x33, 0x3a, |
| 186 | /*7*/ 0xdd, 0xd4, 0xcf, 0xc6, 0xf9, 0xf0, 0xeb, 0xe2, 0x95, 0x9c, 0x87, 0x8e, 0xb1, 0xb8, 0xa3, 0xaa, |
| 187 | /*8*/ 0xec, 0xe5, 0xfe, 0xf7, 0xc8, 0xc1, 0xda, 0xd3, 0xa4, 0xad, 0xb6, 0xbf, 0x80, 0x89, 0x92, 0x9b, |
| 188 | /*9*/ 0x7c, 0x75, 0x6e, 0x67, 0x58, 0x51, 0x4a, 0x43, 0x34, 0x3d, 0x26, 0x2f, 0x10, 0x19, 0x02, 0x0b, |
| 189 | /*a*/ 0xd7, 0xde, 0xc5, 0xcc, 0xf3, 0xfa, 0xe1, 0xe8, 0x9f, 0x96, 0x8d, 0x84, 0xbb, 0xb2, 0xa9, 0xa0, |
| 190 | /*b*/ 0x47, 0x4e, 0x55, 0x5c, 0x63, 0x6a, 0x71, 0x78, 0x0f, 0x06, 0x1d, 0x14, 0x2b, 0x22, 0x39, 0x30, |
| 191 | /*c*/ 0x9a, 0x93, 0x88, 0x81, 0xbe, 0xb7, 0xac, 0xa5, 0xd2, 0xdb, 0xc0, 0xc9, 0xf6, 0xff, 0xe4, 0xed, |
| 192 | /*d*/ 0x0a, 0x03, 0x18, 0x11, 0x2e, 0x27, 0x3c, 0x35, 0x42, 0x4b, 0x50, 0x59, 0x66, 0x6f, 0x74, 0x7d, |
| 193 | /*e*/ 0xa1, 0xa8, 0xb3, 0xba, 0x85, 0x8c, 0x97, 0x9e, 0xe9, 0xe0, 0xfb, 0xf2, 0xcd, 0xc4, 0xdf, 0xd6, |
| 194 | /*f*/ 0x31, 0x38, 0x23, 0x2a, 0x15, 0x1c, 0x07, 0x0e, 0x79, 0x70, 0x6b, 0x62, 0x5d, 0x54, 0x4f, 0x46, |
| 195 | }; |
| 196 | |
| 197 | static uint8_t oaes_gf_mul_b[16][16] = { |
| 198 | // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, |
| 199 | /*0*/ 0x00, 0x0b, 0x16, 0x1d, 0x2c, 0x27, 0x3a, 0x31, 0x58, 0x53, 0x4e, 0x45, 0x74, 0x7f, 0x62, 0x69, |
| 200 | /*1*/ 0xb0, 0xbb, 0xa6, 0xad, 0x9c, 0x97, 0x8a, 0x81, 0xe8, 0xe3, 0xfe, 0xf5, 0xc4, 0xcf, 0xd2, 0xd9, |
| 201 | /*2*/ 0x7b, 0x70, 0x6d, 0x66, 0x57, 0x5c, 0x41, 0x4a, 0x23, 0x28, 0x35, 0x3e, 0x0f, 0x04, 0x19, 0x12, |
| 202 | /*3*/ 0xcb, 0xc0, 0xdd, 0xd6, 0xe7, 0xec, 0xf1, 0xfa, 0x93, 0x98, 0x85, 0x8e, 0xbf, 0xb4, 0xa9, 0xa2, |
| 203 | /*4*/ 0xf6, 0xfd, 0xe0, 0xeb, 0xda, 0xd1, 0xcc, 0xc7, 0xae, 0xa5, 0xb8, 0xb3, 0x82, 0x89, 0x94, 0x9f, |
| 204 | /*5*/ 0x46, 0x4d, 0x50, 0x5b, 0x6a, 0x61, 0x7c, 0x77, 0x1e, 0x15, 0x08, 0x03, 0x32, 0x39, 0x24, 0x2f, |
| 205 | /*6*/ 0x8d, 0x86, 0x9b, 0x90, 0xa1, 0xaa, 0xb7, 0xbc, 0xd5, 0xde, 0xc3, 0xc8, 0xf9, 0xf2, 0xef, 0xe4, |
| 206 | /*7*/ 0x3d, 0x36, 0x2b, 0x20, 0x11, 0x1a, 0x07, 0x0c, 0x65, 0x6e, 0x73, 0x78, 0x49, 0x42, 0x5f, 0x54, |
| 207 | /*8*/ 0xf7, 0xfc, 0xe1, 0xea, 0xdb, 0xd0, 0xcd, 0xc6, 0xaf, 0xa4, 0xb9, 0xb2, 0x83, 0x88, 0x95, 0x9e, |
| 208 | /*9*/ 0x47, 0x4c, 0x51, 0x5a, 0x6b, 0x60, 0x7d, 0x76, 0x1f, 0x14, 0x09, 0x02, 0x33, 0x38, 0x25, 0x2e, |
| 209 | /*a*/ 0x8c, 0x87, 0x9a, 0x91, 0xa0, 0xab, 0xb6, 0xbd, 0xd4, 0xdf, 0xc2, 0xc9, 0xf8, 0xf3, 0xee, 0xe5, |
| 210 | /*b*/ 0x3c, 0x37, 0x2a, 0x21, 0x10, 0x1b, 0x06, 0x0d, 0x64, 0x6f, 0x72, 0x79, 0x48, 0x43, 0x5e, 0x55, |
| 211 | /*c*/ 0x01, 0x0a, 0x17, 0x1c, 0x2d, 0x26, 0x3b, 0x30, 0x59, 0x52, 0x4f, 0x44, 0x75, 0x7e, 0x63, 0x68, |
| 212 | /*d*/ 0xb1, 0xba, 0xa7, 0xac, 0x9d, 0x96, 0x8b, 0x80, 0xe9, 0xe2, 0xff, 0xf4, 0xc5, 0xce, 0xd3, 0xd8, |
| 213 | /*e*/ 0x7a, 0x71, 0x6c, 0x67, 0x56, 0x5d, 0x40, 0x4b, 0x22, 0x29, 0x34, 0x3f, 0x0e, 0x05, 0x18, 0x13, |
| 214 | /*f*/ 0xca, 0xc1, 0xdc, 0xd7, 0xe6, 0xed, 0xf0, 0xfb, 0x92, 0x99, 0x84, 0x8f, 0xbe, 0xb5, 0xa8, 0xa3, |
| 215 | }; |
| 216 | |
| 217 | static uint8_t oaes_gf_mul_d[16][16] = { |
| 218 | // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, |
| 219 | /*0*/ 0x00, 0x0d, 0x1a, 0x17, 0x34, 0x39, 0x2e, 0x23, 0x68, 0x65, 0x72, 0x7f, 0x5c, 0x51, 0x46, 0x4b, |
| 220 | /*1*/ 0xd0, 0xdd, 0xca, 0xc7, 0xe4, 0xe9, 0xfe, 0xf3, 0xb8, 0xb5, 0xa2, 0xaf, 0x8c, 0x81, 0x96, 0x9b, |
| 221 | /*2*/ 0xbb, 0xb6, 0xa1, 0xac, 0x8f, 0x82, 0x95, 0x98, 0xd3, 0xde, 0xc9, 0xc4, 0xe7, 0xea, 0xfd, 0xf0, |
| 222 | /*3*/ 0x6b, 0x66, 0x71, 0x7c, 0x5f, 0x52, 0x45, 0x48, 0x03, 0x0e, 0x19, 0x14, 0x37, 0x3a, 0x2d, 0x20, |
| 223 | /*4*/ 0x6d, 0x60, 0x77, 0x7a, 0x59, 0x54, 0x43, 0x4e, 0x05, 0x08, 0x1f, 0x12, 0x31, 0x3c, 0x2b, 0x26, |
| 224 | /*5*/ 0xbd, 0xb0, 0xa7, 0xaa, 0x89, 0x84, 0x93, 0x9e, 0xd5, 0xd8, 0xcf, 0xc2, 0xe1, 0xec, 0xfb, 0xf6, |
| 225 | /*6*/ 0xd6, 0xdb, 0xcc, 0xc1, 0xe2, 0xef, 0xf8, 0xf5, 0xbe, 0xb3, 0xa4, 0xa9, 0x8a, 0x87, 0x90, 0x9d, |
| 226 | /*7*/ 0x06, 0x0b, 0x1c, 0x11, 0x32, 0x3f, 0x28, 0x25, 0x6e, 0x63, 0x74, 0x79, 0x5a, 0x57, 0x40, 0x4d, |
| 227 | /*8*/ 0xda, 0xd7, 0xc0, 0xcd, 0xee, 0xe3, 0xf4, 0xf9, 0xb2, 0xbf, 0xa8, 0xa5, 0x86, 0x8b, 0x9c, 0x91, |
| 228 | /*9*/ 0x0a, 0x07, 0x10, 0x1d, 0x3e, 0x33, 0x24, 0x29, 0x62, 0x6f, 0x78, 0x75, 0x56, 0x5b, 0x4c, 0x41, |
| 229 | /*a*/ 0x61, 0x6c, 0x7b, 0x76, 0x55, 0x58, 0x4f, 0x42, 0x09, 0x04, 0x13, 0x1e, 0x3d, 0x30, 0x27, 0x2a, |
| 230 | /*b*/ 0xb1, 0xbc, 0xab, 0xa6, 0x85, 0x88, 0x9f, 0x92, 0xd9, 0xd4, 0xc3, 0xce, 0xed, 0xe0, 0xf7, 0xfa, |
| 231 | /*c*/ 0xb7, 0xba, 0xad, 0xa0, 0x83, 0x8e, 0x99, 0x94, 0xdf, 0xd2, 0xc5, 0xc8, 0xeb, 0xe6, 0xf1, 0xfc, |
| 232 | /*d*/ 0x67, 0x6a, 0x7d, 0x70, 0x53, 0x5e, 0x49, 0x44, 0x0f, 0x02, 0x15, 0x18, 0x3b, 0x36, 0x21, 0x2c, |
| 233 | /*e*/ 0x0c, 0x01, 0x16, 0x1b, 0x38, 0x35, 0x22, 0x2f, 0x64, 0x69, 0x7e, 0x73, 0x50, 0x5d, 0x4a, 0x47, |
| 234 | /*f*/ 0xdc, 0xd1, 0xc6, 0xcb, 0xe8, 0xe5, 0xf2, 0xff, 0xb4, 0xb9, 0xae, 0xa3, 0x80, 0x8d, 0x9a, 0x97, |
| 235 | }; |
| 236 | |
| 237 | static uint8_t oaes_gf_mul_e[16][16] = { |
| 238 | // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, |
| 239 | /*0*/ 0x00, 0x0e, 0x1c, 0x12, 0x38, 0x36, 0x24, 0x2a, 0x70, 0x7e, 0x6c, 0x62, 0x48, 0x46, 0x54, 0x5a, |
| 240 | /*1*/ 0xe0, 0xee, 0xfc, 0xf2, 0xd8, 0xd6, 0xc4, 0xca, 0x90, 0x9e, 0x8c, 0x82, 0xa8, 0xa6, 0xb4, 0xba, |
| 241 | /*2*/ 0xdb, 0xd5, 0xc7, 0xc9, 0xe3, 0xed, 0xff, 0xf1, 0xab, 0xa5, 0xb7, 0xb9, 0x93, 0x9d, 0x8f, 0x81, |
| 242 | /*3*/ 0x3b, 0x35, 0x27, 0x29, 0x03, 0x0d, 0x1f, 0x11, 0x4b, 0x45, 0x57, 0x59, 0x73, 0x7d, 0x6f, 0x61, |
| 243 | /*4*/ 0xad, 0xa3, 0xb1, 0xbf, 0x95, 0x9b, 0x89, 0x87, 0xdd, 0xd3, 0xc1, 0xcf, 0xe5, 0xeb, 0xf9, 0xf7, |
| 244 | /*5*/ 0x4d, 0x43, 0x51, 0x5f, 0x75, 0x7b, 0x69, 0x67, 0x3d, 0x33, 0x21, 0x2f, 0x05, 0x0b, 0x19, 0x17, |
| 245 | /*6*/ 0x76, 0x78, 0x6a, 0x64, 0x4e, 0x40, 0x52, 0x5c, 0x06, 0x08, 0x1a, 0x14, 0x3e, 0x30, 0x22, 0x2c, |
| 246 | /*7*/ 0x96, 0x98, 0x8a, 0x84, 0xae, 0xa0, 0xb2, 0xbc, 0xe6, 0xe8, 0xfa, 0xf4, 0xde, 0xd0, 0xc2, 0xcc, |
| 247 | /*8*/ 0x41, 0x4f, 0x5d, 0x53, 0x79, 0x77, 0x65, 0x6b, 0x31, 0x3f, 0x2d, 0x23, 0x09, 0x07, 0x15, 0x1b, |
| 248 | /*9*/ 0xa1, 0xaf, 0xbd, 0xb3, 0x99, 0x97, 0x85, 0x8b, 0xd1, 0xdf, 0xcd, 0xc3, 0xe9, 0xe7, 0xf5, 0xfb, |
| 249 | /*a*/ 0x9a, 0x94, 0x86, 0x88, 0xa2, 0xac, 0xbe, 0xb0, 0xea, 0xe4, 0xf6, 0xf8, 0xd2, 0xdc, 0xce, 0xc0, |
| 250 | /*b*/ 0x7a, 0x74, 0x66, 0x68, 0x42, 0x4c, 0x5e, 0x50, 0x0a, 0x04, 0x16, 0x18, 0x32, 0x3c, 0x2e, 0x20, |
| 251 | /*c*/ 0xec, 0xe2, 0xf0, 0xfe, 0xd4, 0xda, 0xc8, 0xc6, 0x9c, 0x92, 0x80, 0x8e, 0xa4, 0xaa, 0xb8, 0xb6, |
| 252 | /*d*/ 0x0c, 0x02, 0x10, 0x1e, 0x34, 0x3a, 0x28, 0x26, 0x7c, 0x72, 0x60, 0x6e, 0x44, 0x4a, 0x58, 0x56, |
| 253 | /*e*/ 0x37, 0x39, 0x2b, 0x25, 0x0f, 0x01, 0x13, 0x1d, 0x47, 0x49, 0x5b, 0x55, 0x7f, 0x71, 0x63, 0x6d, |
| 254 | /*f*/ 0xd7, 0xd9, 0xcb, 0xc5, 0xef, 0xe1, 0xf3, 0xfd, 0xa7, 0xa9, 0xbb, 0xb5, 0x9f, 0x91, 0x83, 0x8d, |
| 255 | }; |
| 256 | |
| 257 | static OAES_RET oaes_sub_byte( uint8_t * byte ) |
| 258 | { |
| 259 | size_t _x, _y; |
| 260 | |
| 261 | if( NULL == byte ) |
| 262 | return OAES_RET_ARG1; |
| 263 | |
| 264 | _x = _y = *byte; |
| 265 | _x &= 0x0f; |
| 266 | _y &= 0xf0; |
| 267 | _y >>= 4; |
| 268 | *byte = oaes_sub_byte_value[_y][_x]; |
| 269 | |
| 270 | return OAES_RET_SUCCESS; |
| 271 | } |
| 272 | |
| 273 | static OAES_RET oaes_inv_sub_byte( uint8_t * byte ) |
| 274 | { |
| 275 | size_t _x, _y; |
| 276 | |
| 277 | if( NULL == byte ) |
| 278 | return OAES_RET_ARG1; |
| 279 | |
| 280 | _x = _y = *byte; |
| 281 | _x &= 0x0f; |
| 282 | _y &= 0xf0; |
| 283 | _y >>= 4; |
| 284 | *byte = oaes_inv_sub_byte_value[_y][_x]; |
| 285 | |
| 286 | return OAES_RET_SUCCESS; |
| 287 | } |
| 288 | |
| 289 | static OAES_RET oaes_word_rot_right( uint8_t word[OAES_COL_LEN] ) |
| 290 | { |
| 291 | uint8_t _temp[OAES_COL_LEN]; |
| 292 | |
| 293 | if( NULL == word ) |
| 294 | return OAES_RET_ARG1; |
| 295 | |
| 296 | memcpy( _temp + 1, word, OAES_COL_LEN - 1 ); |
| 297 | _temp[0] = word[OAES_COL_LEN - 1]; |
| 298 | memcpy( word, _temp, OAES_COL_LEN ); |
| 299 | |
| 300 | return OAES_RET_SUCCESS; |
| 301 | } |
| 302 | |
| 303 | static OAES_RET oaes_word_rot_left( uint8_t word[OAES_COL_LEN] ) |
| 304 | { |
| 305 | uint8_t _temp[OAES_COL_LEN]; |
| 306 | |
| 307 | if( NULL == word ) |
| 308 | return OAES_RET_ARG1; |
| 309 | |
| 310 | memcpy( _temp, word + 1, OAES_COL_LEN - 1 ); |
| 311 | _temp[OAES_COL_LEN - 1] = word[0]; |
| 312 | memcpy( word, _temp, OAES_COL_LEN ); |
| 313 | |
| 314 | return OAES_RET_SUCCESS; |
| 315 | } |
| 316 | |
| 317 | static OAES_RET oaes_shift_rows( uint8_t block[OAES_BLOCK_SIZE] ) |
| 318 | { |
| 319 | uint8_t _temp[OAES_BLOCK_SIZE]; |
| 320 | |
| 321 | if( NULL == block ) |
| 322 | return OAES_RET_ARG1; |
| 323 | |
| 324 | _temp[0x00] = block[0x00]; |
| 325 | _temp[0x01] = block[0x05]; |
| 326 | _temp[0x02] = block[0x0a]; |
| 327 | _temp[0x03] = block[0x0f]; |
| 328 | _temp[0x04] = block[0x04]; |
| 329 | _temp[0x05] = block[0x09]; |
| 330 | _temp[0x06] = block[0x0e]; |
| 331 | _temp[0x07] = block[0x03]; |
| 332 | _temp[0x08] = block[0x08]; |
| 333 | _temp[0x09] = block[0x0d]; |
| 334 | _temp[0x0a] = block[0x02]; |
| 335 | _temp[0x0b] = block[0x07]; |
| 336 | _temp[0x0c] = block[0x0c]; |
| 337 | _temp[0x0d] = block[0x01]; |
| 338 | _temp[0x0e] = block[0x06]; |
| 339 | _temp[0x0f] = block[0x0b]; |
| 340 | memcpy( block, _temp, OAES_BLOCK_SIZE ); |
| 341 | |
| 342 | return OAES_RET_SUCCESS; |
| 343 | } |
| 344 | |
| 345 | static OAES_RET oaes_inv_shift_rows( uint8_t block[OAES_BLOCK_SIZE] ) |
| 346 | { |
| 347 | uint8_t _temp[OAES_BLOCK_SIZE]; |
| 348 | |
| 349 | if( NULL == block ) |
| 350 | return OAES_RET_ARG1; |
| 351 | |
| 352 | _temp[0x00] = block[0x00]; |
| 353 | _temp[0x01] = block[0x0d]; |
| 354 | _temp[0x02] = block[0x0a]; |
| 355 | _temp[0x03] = block[0x07]; |
| 356 | _temp[0x04] = block[0x04]; |
| 357 | _temp[0x05] = block[0x01]; |
| 358 | _temp[0x06] = block[0x0e]; |
| 359 | _temp[0x07] = block[0x0b]; |
| 360 | _temp[0x08] = block[0x08]; |
| 361 | _temp[0x09] = block[0x05]; |
| 362 | _temp[0x0a] = block[0x02]; |
| 363 | _temp[0x0b] = block[0x0f]; |
| 364 | _temp[0x0c] = block[0x0c]; |
| 365 | _temp[0x0d] = block[0x09]; |
| 366 | _temp[0x0e] = block[0x06]; |
| 367 | _temp[0x0f] = block[0x03]; |
| 368 | memcpy( block, _temp, OAES_BLOCK_SIZE ); |
| 369 | |
| 370 | return OAES_RET_SUCCESS; |
| 371 | } |
| 372 | |
| 373 | static uint8_t oaes_gf_mul(uint8_t left, uint8_t right) |
| 374 | { |
| 375 | size_t _x, _y; |
| 376 | |
| 377 | _x = _y = left; |
| 378 | _x &= 0x0f; |
| 379 | _y &= 0xf0; |
| 380 | _y >>= 4; |
| 381 | |
| 382 | switch( right ) |
| 383 | { |
| 384 | case 0x02: |
| 385 | return oaes_gf_mul_2[_y][_x]; |
| 386 | break; |
| 387 | case 0x03: |
| 388 | return oaes_gf_mul_3[_y][_x]; |
| 389 | break; |
| 390 | case 0x09: |
| 391 | return oaes_gf_mul_9[_y][_x]; |
| 392 | break; |
| 393 | case 0x0b: |
| 394 | return oaes_gf_mul_b[_y][_x]; |
| 395 | break; |
| 396 | case 0x0d: |
| 397 | return oaes_gf_mul_d[_y][_x]; |
| 398 | break; |
| 399 | case 0x0e: |
| 400 | return oaes_gf_mul_e[_y][_x]; |
| 401 | break; |
| 402 | default: |
| 403 | return left; |
| 404 | break; |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | static OAES_RET oaes_mix_cols( uint8_t word[OAES_COL_LEN] ) |
| 409 | { |
| 410 | uint8_t _temp[OAES_COL_LEN]; |
| 411 | |
| 412 | if( NULL == word ) |
| 413 | return OAES_RET_ARG1; |
| 414 | |
| 415 | _temp[0] = oaes_gf_mul(word[0], 0x02) ^ oaes_gf_mul( word[1], 0x03 ) ^ |
| 416 | word[2] ^ word[3]; |
| 417 | _temp[1] = word[0] ^ oaes_gf_mul( word[1], 0x02 ) ^ |
| 418 | oaes_gf_mul( word[2], 0x03 ) ^ word[3]; |
| 419 | _temp[2] = word[0] ^ word[1] ^ |
| 420 | oaes_gf_mul( word[2], 0x02 ) ^ oaes_gf_mul( word[3], 0x03 ); |
| 421 | _temp[3] = oaes_gf_mul( word[0], 0x03 ) ^ word[1] ^ |
| 422 | word[2] ^ oaes_gf_mul( word[3], 0x02 ); |
| 423 | memcpy( word, _temp, OAES_COL_LEN ); |
| 424 | |
| 425 | return OAES_RET_SUCCESS; |
| 426 | } |
| 427 | |
| 428 | static OAES_RET oaes_inv_mix_cols( uint8_t word[OAES_COL_LEN] ) |
| 429 | { |
| 430 | uint8_t _temp[OAES_COL_LEN]; |
| 431 | |
| 432 | if( NULL == word ) |
| 433 | return OAES_RET_ARG1; |
| 434 | |
| 435 | _temp[0] = oaes_gf_mul( word[0], 0x0e ) ^ oaes_gf_mul( word[1], 0x0b ) ^ |
| 436 | oaes_gf_mul( word[2], 0x0d ) ^ oaes_gf_mul( word[3], 0x09 ); |
| 437 | _temp[1] = oaes_gf_mul( word[0], 0x09 ) ^ oaes_gf_mul( word[1], 0x0e ) ^ |
| 438 | oaes_gf_mul( word[2], 0x0b ) ^ oaes_gf_mul( word[3], 0x0d ); |
| 439 | _temp[2] = oaes_gf_mul( word[0], 0x0d ) ^ oaes_gf_mul( word[1], 0x09 ) ^ |
| 440 | oaes_gf_mul( word[2], 0x0e ) ^ oaes_gf_mul( word[3], 0x0b ); |
| 441 | _temp[3] = oaes_gf_mul( word[0], 0x0b ) ^ oaes_gf_mul( word[1], 0x0d ) ^ |
| 442 | oaes_gf_mul( word[2], 0x09 ) ^ oaes_gf_mul( word[3], 0x0e ); |
| 443 | memcpy( word, _temp, OAES_COL_LEN ); |
| 444 | |
| 445 | return OAES_RET_SUCCESS; |
| 446 | } |
| 447 | |
| 448 | OAES_RET oaes_sprintf( |
| 449 | char * buf, size_t * buf_len, const uint8_t * data, size_t data_len ) |
| 450 | { |
| 451 | size_t _i, _buf_len_in; |
| 452 | char _temp[4]; |
| 453 | |
| 454 | if( NULL == buf_len ) |
| 455 | return OAES_RET_ARG2; |
| 456 | |
| 457 | _buf_len_in = *buf_len; |
| 458 | *buf_len = data_len * 3 + data_len / OAES_BLOCK_SIZE + 1; |
| 459 | |
| 460 | if( NULL == buf ) |
| 461 | return OAES_RET_SUCCESS; |
| 462 | |
| 463 | if( *buf_len > _buf_len_in ) |
| 464 | return OAES_RET_BUF; |
| 465 | |
| 466 | if( NULL == data ) |
| 467 | return OAES_RET_ARG3; |
| 468 | |
| 469 | strcpy( buf, "" ); |
| 470 | |
| 471 | for( _i = 0; _i < data_len; _i++ ) |
| 472 | { |
| 473 | sprintf( _temp, "%02x ", data[_i] ); |
| 474 | strcat( buf, _temp ); |
| 475 | if( _i && 0 == ( _i + 1 ) % OAES_BLOCK_SIZE ) |
| 476 | strcat( buf, "\n" ); |
| 477 | } |
| 478 | |
| 479 | return OAES_RET_SUCCESS; |
| 480 | } |
| 481 | |
| 482 | #ifdef OAES_HAVE_ISAAC |
| 483 | static void oaes_get_seed( char buf[RANDSIZ + 1] ) |
| 484 | { |
| 485 | struct timeb timer; |
| 486 | struct tm *gmTimer; |
| 487 | char * _test = NULL; |
| 488 | |
| 489 | ftime (&timer); |
| 490 | gmTimer = gmtime( &timer.time ); |
| 491 | _test = (char *) calloc( sizeof( char ), timer.millitm ); |
| 492 | sprintf( buf, "%04d%02d%02d%02d%02d%02d%03d%p%d", |
| 493 | gmTimer->tm_year + 1900, gmTimer->tm_mon + 1, gmTimer->tm_mday, |
| 494 | gmTimer->tm_hour, gmTimer->tm_min, gmTimer->tm_sec, timer.millitm, |
| 495 | _test + timer.millitm, getpid() ); |
| 496 | |
| 497 | if( _test ) |
| 498 | free( _test ); |
| 499 | } |
| 500 | #else |
| 501 | static uint32_t oaes_get_seed() |
| 502 | { |
| 503 | struct timeb timer; |
| 504 | struct tm *gmTimer; |
| 505 | char * _test = NULL; |
| 506 | uint32_t _ret = 0; |
| 507 | |
| 508 | ftime (&timer); |
| 509 | gmTimer = gmtime( &timer.time ); |
| 510 | _test = (char *) calloc( sizeof( char ), timer.millitm ); |
| 511 | _ret = gmTimer->tm_year + 1900 + gmTimer->tm_mon + 1 + gmTimer->tm_mday + |
| 512 | gmTimer->tm_hour + gmTimer->tm_min + gmTimer->tm_sec + timer.millitm + |
| 513 | (uint32_t) ( _test + timer.millitm ) + getpid(); |
| 514 | |
| 515 | if( _test ) |
| 516 | free( _test ); |
| 517 | |
| 518 | return _ret; |
| 519 | } |
| 520 | #endif // OAES_HAVE_ISAAC |
| 521 | |
| 522 | static OAES_RET oaes_key_destroy( oaes_key ** key ) |
| 523 | { |
| 524 | if( NULL == *key ) |
| 525 | return OAES_RET_SUCCESS; |
| 526 | |
| 527 | if( (*key)->data ) |
| 528 | { |
| 529 | free( (*key)->data ); |
| 530 | (*key)->data = NULL; |
| 531 | } |
| 532 | |
| 533 | if( (*key)->exp_data ) |
| 534 | { |
| 535 | free( (*key)->exp_data ); |
| 536 | (*key)->exp_data = NULL; |
| 537 | } |
| 538 | |
| 539 | (*key)->data_len = 0; |
| 540 | (*key)->exp_data_len = 0; |
| 541 | (*key)->num_keys = 0; |
| 542 | (*key)->key_base = 0; |
| 543 | free( *key ); |
| 544 | *key = NULL; |
| 545 | |
| 546 | return OAES_RET_SUCCESS; |
| 547 | } |
| 548 | |
| 549 | static OAES_RET oaes_key_expand( OAES_CTX * ctx ) |
| 550 | { |
| 551 | size_t _i, _j; |
| 552 | oaes_ctx * _ctx = (oaes_ctx *) ctx; |
| 553 | |
| 554 | if( NULL == _ctx ) |
| 555 | return OAES_RET_ARG1; |
| 556 | |
| 557 | if( NULL == _ctx->key ) |
| 558 | return OAES_RET_NOKEY; |
| 559 | |
| 560 | _ctx->key->key_base = _ctx->key->data_len / OAES_RKEY_LEN; |
| 561 | _ctx->key->num_keys = _ctx->key->key_base + OAES_ROUND_BASE; |
| 562 | |
| 563 | _ctx->key->exp_data_len = _ctx->key->num_keys * OAES_RKEY_LEN * OAES_COL_LEN; |
| 564 | _ctx->key->exp_data = (uint8_t *) |
| 565 | calloc( _ctx->key->exp_data_len, sizeof( uint8_t )); |
| 566 | |
| 567 | if( NULL == _ctx->key->exp_data ) |
| 568 | return OAES_RET_MEM; |
| 569 | |
| 570 | // the first _ctx->key->data_len are a direct copy |
| 571 | memcpy( _ctx->key->exp_data, _ctx->key->data, _ctx->key->data_len ); |
| 572 | |
| 573 | // apply ExpandKey algorithm for remainder |
| 574 | for( _i = _ctx->key->key_base; _i < _ctx->key->num_keys * OAES_RKEY_LEN; _i++ ) |
| 575 | { |
| 576 | uint8_t _temp[OAES_COL_LEN]; |
| 577 | |
| 578 | memcpy( _temp, |
| 579 | _ctx->key->exp_data + ( _i - 1 ) * OAES_RKEY_LEN, OAES_COL_LEN ); |
| 580 | |
| 581 | // transform key column |
| 582 | if( 0 == _i % _ctx->key->key_base ) |
| 583 | { |
| 584 | oaes_word_rot_left( _temp ); |
| 585 | |
| 586 | for( _j = 0; _j < OAES_COL_LEN; _j++ ) |
| 587 | oaes_sub_byte( _temp + _j ); |
| 588 | |
| 589 | _temp[0] = _temp[0] ^ oaes_gf_8[ _i / _ctx->key->key_base - 1 ]; |
| 590 | } |
| 591 | else if( _ctx->key->key_base > 6 && 4 == _i % _ctx->key->key_base ) |
| 592 | { |
| 593 | for( _j = 0; _j < OAES_COL_LEN; _j++ ) |
| 594 | oaes_sub_byte( _temp + _j ); |
| 595 | } |
| 596 | |
| 597 | for( _j = 0; _j < OAES_COL_LEN; _j++ ) |
| 598 | { |
| 599 | _ctx->key->exp_data[ _i * OAES_RKEY_LEN + _j ] = |
| 600 | _ctx->key->exp_data[ ( _i - _ctx->key->key_base ) * |
| 601 | OAES_RKEY_LEN + _j ] ^ _temp[_j]; |
| 602 | } |
| 603 | } |
| 604 | |
| 605 | return OAES_RET_SUCCESS; |
| 606 | } |
| 607 | |
| 608 | static OAES_RET oaes_key_gen( OAES_CTX * ctx, size_t key_size ) |
| 609 | { |
| 610 | size_t _i; |
| 611 | oaes_key * _key = NULL; |
| 612 | oaes_ctx * _ctx = (oaes_ctx *) ctx; |
| 613 | OAES_RET _rc = OAES_RET_SUCCESS; |
| 614 | |
| 615 | if( NULL == _ctx ) |
| 616 | return OAES_RET_ARG1; |
| 617 | |
| 618 | _key = (oaes_key *) calloc( sizeof( oaes_key ), 1 ); |
| 619 | |
| 620 | if( NULL == _key ) |
| 621 | return OAES_RET_MEM; |
| 622 | |
| 623 | if( _ctx->key ) |
| 624 | oaes_key_destroy( &(_ctx->key) ); |
| 625 | |
| 626 | _key->data_len = key_size; |
| 627 | _key->data = (uint8_t *) calloc( key_size, sizeof( uint8_t )); |
| 628 | |
| 629 | if( NULL == _key->data ) |
| 630 | return OAES_RET_MEM; |
| 631 | |
| 632 | for( _i = 0; _i < key_size; _i++ ) |
| 633 | #ifdef OAES_HAVE_ISAAC |
| 634 | _key->data[_i] = (uint8_t) rand( _ctx->rctx ); |
| 635 | #else |
| 636 | _key->data[_i] = (uint8_t) rand(); |
| 637 | #endif // OAES_HAVE_ISAAC |
| 638 | |
| 639 | _ctx->key = _key; |
| 640 | _rc = _rc || oaes_key_expand( ctx ); |
| 641 | |
| 642 | if( _rc != OAES_RET_SUCCESS ) |
| 643 | { |
| 644 | oaes_key_destroy( &(_ctx->key) ); |
| 645 | return _rc; |
| 646 | } |
| 647 | |
| 648 | return OAES_RET_SUCCESS; |
| 649 | } |
| 650 | |
| 651 | OAES_RET oaes_key_gen_128( OAES_CTX * ctx ) |
| 652 | { |
| 653 | return oaes_key_gen( ctx, 16 ); |
| 654 | } |
| 655 | |
| 656 | OAES_RET oaes_key_gen_192( OAES_CTX * ctx ) |
| 657 | { |
| 658 | return oaes_key_gen( ctx, 24 ); |
| 659 | } |
| 660 | |
| 661 | OAES_RET oaes_key_gen_256( OAES_CTX * ctx ) |
| 662 | { |
| 663 | return oaes_key_gen( ctx, 32 ); |
| 664 | } |
| 665 | |
| 666 | OAES_RET oaes_key_export( OAES_CTX * ctx, |
| 667 | uint8_t * data, size_t * data_len ) |
| 668 | { |
| 669 | size_t _data_len_in; |
| 670 | oaes_ctx * _ctx = (oaes_ctx *) ctx; |
| 671 | |
| 672 | if( NULL == _ctx ) |
| 673 | return OAES_RET_ARG1; |
| 674 | |
| 675 | if( NULL == _ctx->key ) |
| 676 | return OAES_RET_NOKEY; |
| 677 | |
| 678 | if( NULL == data_len ) |
| 679 | return OAES_RET_ARG3; |
| 680 | |
| 681 | _data_len_in = *data_len; |
| 682 | // data + header |
| 683 | *data_len = _ctx->key->data_len + OAES_BLOCK_SIZE; |
| 684 | |
| 685 | if( NULL == data ) |
| 686 | return OAES_RET_SUCCESS; |
| 687 | |
| 688 | if( _data_len_in < *data_len ) |
| 689 | return OAES_RET_BUF; |
| 690 | |
| 691 | // header |
| 692 | memcpy( data, oaes_header, OAES_BLOCK_SIZE ); |
| 693 | data[5] = 0x01; |
| 694 | data[7] = _ctx->key->data_len; |
| 695 | memcpy( data + OAES_BLOCK_SIZE, _ctx->key->data, _ctx->key->data_len ); |
| 696 | |
| 697 | return OAES_RET_SUCCESS; |
| 698 | } |
| 699 | |
| 700 | OAES_RET oaes_key_export_data( OAES_CTX * ctx, |
| 701 | uint8_t * data, size_t * data_len ) |
| 702 | { |
| 703 | size_t _data_len_in; |
| 704 | oaes_ctx * _ctx = (oaes_ctx *) ctx; |
| 705 | |
| 706 | if( NULL == _ctx ) |
| 707 | return OAES_RET_ARG1; |
| 708 | |
| 709 | if( NULL == _ctx->key ) |
| 710 | return OAES_RET_NOKEY; |
| 711 | |
| 712 | if( NULL == data_len ) |
| 713 | return OAES_RET_ARG3; |
| 714 | |
| 715 | _data_len_in = *data_len; |
| 716 | *data_len = _ctx->key->data_len; |
| 717 | |
| 718 | if( NULL == data ) |
| 719 | return OAES_RET_SUCCESS; |
| 720 | |
| 721 | if( _data_len_in < *data_len ) |
| 722 | return OAES_RET_BUF; |
| 723 | |
| 724 | memcpy( data, _ctx->key->data, *data_len ); |
| 725 | |
| 726 | return OAES_RET_SUCCESS; |
| 727 | } |
| 728 | |
| 729 | OAES_RET oaes_key_import( OAES_CTX * ctx, |
| 730 | const uint8_t * data, size_t data_len ) |
| 731 | { |
| 732 | oaes_ctx * _ctx = (oaes_ctx *) ctx; |
| 733 | OAES_RET _rc = OAES_RET_SUCCESS; |
| 734 | int _key_length; |
| 735 | |
| 736 | if( NULL == _ctx ) |
| 737 | return OAES_RET_ARG1; |
| 738 | |
| 739 | if( NULL == data ) |
| 740 | return OAES_RET_ARG2; |
| 741 | |
| 742 | switch( data_len ) |
| 743 | { |
| 744 | case 16 + OAES_BLOCK_SIZE: |
| 745 | case 24 + OAES_BLOCK_SIZE: |
| 746 | case 32 + OAES_BLOCK_SIZE: |
| 747 | break; |
| 748 | default: |
| 749 | return OAES_RET_ARG3; |
| 750 | } |
| 751 | |
| 752 | // header |
| 753 | if( 0 != memcmp( data, oaes_header, 4 ) ) |
| 754 | return OAES_RET_HEADER; |
| 755 | |
| 756 | // header version |
| 757 | switch( data[4] ) |
| 758 | { |
| 759 | case 0x01: |
| 760 | break; |
| 761 | default: |
| 762 | return OAES_RET_HEADER; |
| 763 | } |
| 764 | |
| 765 | // header type |
| 766 | switch( data[5] ) |
| 767 | { |
| 768 | case 0x01: |
| 769 | break; |
| 770 | default: |
| 771 | return OAES_RET_HEADER; |
| 772 | } |
| 773 | |
| 774 | // options |
| 775 | _key_length = data[7]; |
| 776 | switch( _key_length ) |
| 777 | { |
| 778 | case 16: |
| 779 | case 24: |
| 780 | case 32: |
| 781 | break; |
| 782 | default: |
| 783 | return OAES_RET_HEADER; |
| 784 | } |
| 785 | |
| 786 | if( data_len != _key_length + OAES_BLOCK_SIZE ) |
| 787 | return OAES_RET_ARG3; |
| 788 | |
| 789 | if( _ctx->key ) |
| 790 | oaes_key_destroy( &(_ctx->key) ); |
| 791 | |
| 792 | _ctx->key = (oaes_key *) calloc( sizeof( oaes_key ), 1 ); |
| 793 | |
| 794 | if( NULL == _ctx->key ) |
| 795 | return OAES_RET_MEM; |
| 796 | |
| 797 | _ctx->key->data_len = _key_length; |
| 798 | _ctx->key->data = (uint8_t *) |
| 799 | calloc( _key_length, sizeof( uint8_t )); |
| 800 | |
| 801 | if( NULL == _ctx->key->data ) |
| 802 | { |
| 803 | oaes_key_destroy( &(_ctx->key) ); |
| 804 | return OAES_RET_MEM; |
| 805 | } |
| 806 | |
| 807 | memcpy( _ctx->key->data, data + OAES_BLOCK_SIZE, _key_length ); |
| 808 | _rc = _rc || oaes_key_expand( ctx ); |
| 809 | |
| 810 | if( _rc != OAES_RET_SUCCESS ) |
| 811 | { |
| 812 | oaes_key_destroy( &(_ctx->key) ); |
| 813 | return _rc; |
| 814 | } |
| 815 | |
| 816 | return OAES_RET_SUCCESS; |
| 817 | } |
| 818 | |
| 819 | OAES_RET oaes_key_import_data( OAES_CTX * ctx, |
| 820 | const uint8_t * data, size_t data_len ) |
| 821 | { |
| 822 | oaes_ctx * _ctx = (oaes_ctx *) ctx; |
| 823 | OAES_RET _rc = OAES_RET_SUCCESS; |
| 824 | |
| 825 | if( NULL == _ctx ) |
| 826 | return OAES_RET_ARG1; |
| 827 | |
| 828 | if( NULL == data ) |
| 829 | return OAES_RET_ARG2; |
| 830 | |
| 831 | switch( data_len ) |
| 832 | { |
| 833 | case 16: |
| 834 | case 24: |
| 835 | case 32: |
| 836 | break; |
| 837 | default: |
| 838 | return OAES_RET_ARG3; |
| 839 | } |
| 840 | |
| 841 | if( _ctx->key ) |
| 842 | oaes_key_destroy( &(_ctx->key) ); |
| 843 | |
| 844 | _ctx->key = (oaes_key *) calloc( sizeof( oaes_key ), 1 ); |
| 845 | |
| 846 | if( NULL == _ctx->key ) |
| 847 | return OAES_RET_MEM; |
| 848 | |
| 849 | _ctx->key->data_len = data_len; |
| 850 | _ctx->key->data = (uint8_t *) |
| 851 | calloc( data_len, sizeof( uint8_t )); |
| 852 | |
| 853 | if( NULL == _ctx->key->data ) |
| 854 | { |
| 855 | oaes_key_destroy( &(_ctx->key) ); |
| 856 | return OAES_RET_MEM; |
| 857 | } |
| 858 | |
| 859 | memcpy( _ctx->key->data, data, data_len ); |
| 860 | _rc = _rc || oaes_key_expand( ctx ); |
| 861 | |
| 862 | if( _rc != OAES_RET_SUCCESS ) |
| 863 | { |
| 864 | oaes_key_destroy( &(_ctx->key) ); |
| 865 | return _rc; |
| 866 | } |
| 867 | |
| 868 | return OAES_RET_SUCCESS; |
| 869 | } |
| 870 | |
| 871 | OAES_CTX * oaes_alloc() |
| 872 | { |
| 873 | oaes_ctx * _ctx = (oaes_ctx *) calloc( sizeof( oaes_ctx ), 1 ); |
| 874 | |
| 875 | if( NULL == _ctx ) |
| 876 | return NULL; |
| 877 | |
| 878 | #ifdef OAES_HAVE_ISAAC |
| 879 | { |
| 880 | ub4 _i = 0; |
| 881 | char _seed[RANDSIZ + 1]; |
| 882 | |
| 883 | _ctx->rctx = (randctx *) calloc( sizeof( randctx ), 1 ); |
| 884 | |
| 885 | if( NULL == _ctx->rctx ) |
| 886 | { |
| 887 | free( _ctx ); |
| 888 | return NULL; |
| 889 | } |
| 890 | |
| 891 | oaes_get_seed( _seed ); |
| 892 | memset( _ctx->rctx->randrsl, 0, RANDSIZ ); |
| 893 | memcpy( _ctx->rctx->randrsl, _seed, RANDSIZ ); |
| 894 | randinit( _ctx->rctx, TRUE); |
| 895 | } |
| 896 | #else |
| 897 | srand( oaes_get_seed() ); |
| 898 | #endif // OAES_HAVE_ISAAC |
| 899 | |
| 900 | _ctx->key = NULL; |
| 901 | oaes_set_option( _ctx, OAES_OPTION_CBC, NULL ); |
| 902 | |
| 903 | #ifdef OAES_DEBUG |
| 904 | _ctx->step_cb = NULL; |
| 905 | oaes_set_option( _ctx, OAES_OPTION_STEP_OFF, NULL ); |
| 906 | #endif // OAES_DEBUG |
| 907 | |
| 908 | return (OAES_CTX *) _ctx; |
| 909 | } |
| 910 | |
| 911 | OAES_RET oaes_free( OAES_CTX ** ctx ) |
| 912 | { |
| 913 | oaes_ctx ** _ctx = (oaes_ctx **) ctx; |
| 914 | |
| 915 | if( NULL == _ctx ) |
| 916 | return OAES_RET_ARG1; |
| 917 | |
| 918 | if( NULL == *_ctx ) |
| 919 | return OAES_RET_SUCCESS; |
| 920 | |
| 921 | if( (*_ctx)->key ) |
| 922 | oaes_key_destroy( &((*_ctx)->key) ); |
| 923 | |
| 924 | #ifdef OAES_HAVE_ISAAC |
| 925 | if( (*_ctx)->rctx ) |
| 926 | { |
| 927 | free( (*_ctx)->rctx ); |
| 928 | (*_ctx)->rctx = NULL; |
| 929 | } |
| 930 | #endif // OAES_HAVE_ISAAC |
| 931 | |
| 932 | free( *_ctx ); |
| 933 | *_ctx = NULL; |
| 934 | |
| 935 | return OAES_RET_SUCCESS; |
| 936 | } |
| 937 | |
| 938 | OAES_RET oaes_set_option( OAES_CTX * ctx, |
| 939 | OAES_OPTION option, const void * value ) |
| 940 | { |
| 941 | size_t _i; |
| 942 | oaes_ctx * _ctx = (oaes_ctx *) ctx; |
| 943 | |
| 944 | if( NULL == _ctx ) |
| 945 | return OAES_RET_ARG1; |
| 946 | |
| 947 | switch( option ) |
| 948 | { |
| 949 | case OAES_OPTION_ECB: |
| 950 | _ctx->options &= ~OAES_OPTION_CBC; |
| 951 | memset( _ctx->iv, 0, OAES_BLOCK_SIZE ); |
| 952 | break; |
| 953 | |
| 954 | case OAES_OPTION_CBC: |
| 955 | _ctx->options &= ~OAES_OPTION_ECB; |
| 956 | if( value ) |
| 957 | memcpy( _ctx->iv, value, OAES_BLOCK_SIZE ); |
| 958 | else |
| 959 | { |
| 960 | for( _i = 0; _i < OAES_BLOCK_SIZE; _i++ ) |
| 961 | #ifdef OAES_HAVE_ISAAC |
| 962 | _ctx->iv[_i] = (uint8_t) rand( _ctx->rctx ); |
| 963 | #else |
| 964 | _ctx->iv[_i] = (uint8_t) rand(); |
| 965 | #endif // OAES_HAVE_ISAAC |
| 966 | } |
| 967 | break; |
| 968 | |
| 969 | #ifdef OAES_DEBUG |
| 970 | |
| 971 | case OAES_OPTION_STEP_ON: |
| 972 | if( value ) |
| 973 | { |
| 974 | _ctx->options &= ~OAES_OPTION_STEP_OFF; |
| 975 | _ctx->step_cb = value; |
| 976 | } |
| 977 | else |
| 978 | { |
| 979 | _ctx->options &= ~OAES_OPTION_STEP_ON; |
| 980 | _ctx->options |= OAES_OPTION_STEP_OFF; |
| 981 | _ctx->step_cb = NULL; |
| 982 | return OAES_RET_ARG3; |
| 983 | } |
| 984 | break; |
| 985 | |
| 986 | case OAES_OPTION_STEP_OFF: |
| 987 | _ctx->options &= ~OAES_OPTION_STEP_ON; |
| 988 | _ctx->step_cb = NULL; |
| 989 | break; |
| 990 | |
| 991 | #endif // OAES_DEBUG |
| 992 | |
| 993 | default: |
| 994 | return OAES_RET_ARG2; |
| 995 | } |
| 996 | |
| 997 | _ctx->options |= option; |
| 998 | |
| 999 | return OAES_RET_SUCCESS; |
| 1000 | } |
| 1001 | |
| 1002 | static OAES_RET oaes_encrypt_block( |
| 1003 | OAES_CTX * ctx, uint8_t * c, size_t c_len ) |
| 1004 | { |
| 1005 | size_t _i, _j; |
| 1006 | oaes_ctx * _ctx = (oaes_ctx *) ctx; |
| 1007 | |
| 1008 | if( NULL == _ctx ) |
| 1009 | return OAES_RET_ARG1; |
| 1010 | |
| 1011 | if( NULL == c ) |
| 1012 | return OAES_RET_ARG2; |
| 1013 | |
| 1014 | if( c_len != OAES_BLOCK_SIZE ) |
| 1015 | return OAES_RET_ARG3; |
| 1016 | |
| 1017 | if( NULL == _ctx->key ) |
| 1018 | return OAES_RET_NOKEY; |
| 1019 | |
| 1020 | #ifdef OAES_DEBUG |
| 1021 | if( _ctx->step_cb ) |
| 1022 | _ctx->step_cb( c, "input", 1, NULL ); |
| 1023 | #endif // OAES_DEBUG |
| 1024 | |
| 1025 | // AddRoundKey(State, K0) |
| 1026 | for( _i = 0; _i < c_len; _i++ ) |
| 1027 | c[_i] = c[_i] ^ _ctx->key->exp_data[_i]; |
| 1028 | |
| 1029 | #ifdef OAES_DEBUG |
| 1030 | if( _ctx->step_cb ) |
| 1031 | { |
| 1032 | _ctx->step_cb( _ctx->key->exp_data, "k_sch", 1, NULL ); |
| 1033 | _ctx->step_cb( c, "k_add", 1, NULL ); |
| 1034 | } |
| 1035 | #endif // OAES_DEBUG |
| 1036 | |
| 1037 | // for round = 1 step 1 to Nr–1 |
| 1038 | for( _i = 1; _i < _ctx->key->num_keys - 1; _i++ ) |
| 1039 | { |
| 1040 | // SubBytes(state) |
| 1041 | for( _j = 0; _j < c_len; _j++ ) |
| 1042 | oaes_sub_byte( c + _j ); |
| 1043 | |
| 1044 | #ifdef OAES_DEBUG |
| 1045 | if( _ctx->step_cb ) |
| 1046 | _ctx->step_cb( c, "s_box", _i, NULL ); |
| 1047 | #endif // OAES_DEBUG |
| 1048 | |
| 1049 | // ShiftRows(state) |
| 1050 | oaes_shift_rows( c ); |
| 1051 | |
| 1052 | #ifdef OAES_DEBUG |
| 1053 | if( _ctx->step_cb ) |
| 1054 | _ctx->step_cb( c, "s_row", _i, NULL ); |
| 1055 | #endif // OAES_DEBUG |
| 1056 | |
| 1057 | // MixColumns(state) |
| 1058 | oaes_mix_cols( c ); |
| 1059 | oaes_mix_cols( c + 4 ); |
| 1060 | oaes_mix_cols( c + 8 ); |
| 1061 | oaes_mix_cols( c + 12 ); |
| 1062 | |
| 1063 | #ifdef OAES_DEBUG |
| 1064 | if( _ctx->step_cb ) |
| 1065 | _ctx->step_cb( c, "m_col", _i, NULL ); |
| 1066 | #endif // OAES_DEBUG |
| 1067 | |
| 1068 | // AddRoundKey(state, w[round*Nb, (round+1)*Nb-1]) |
| 1069 | for( _j = 0; _j < c_len; _j++ ) |
| 1070 | c[_j] = c[_j] ^ |
| 1071 | _ctx->key->exp_data[_i * OAES_RKEY_LEN * OAES_COL_LEN + _j]; |
| 1072 | |
| 1073 | #ifdef OAES_DEBUG |
| 1074 | if( _ctx->step_cb ) |
| 1075 | { |
| 1076 | _ctx->step_cb( _ctx->key->exp_data + _i * OAES_RKEY_LEN * OAES_COL_LEN, |
| 1077 | "k_sch", _i, NULL ); |
| 1078 | _ctx->step_cb( c, "k_add", _i, NULL ); |
| 1079 | } |
| 1080 | #endif // OAES_DEBUG |
| 1081 | |
| 1082 | } |
| 1083 | |
| 1084 | // SubBytes(state) |
| 1085 | for( _i = 0; _i < c_len; _i++ ) |
| 1086 | oaes_sub_byte( c + _i ); |
| 1087 | |
| 1088 | #ifdef OAES_DEBUG |
| 1089 | if( _ctx->step_cb ) |
| 1090 | _ctx->step_cb( c, "s_box", _ctx->key->num_keys - 1, NULL ); |
| 1091 | #endif // OAES_DEBUG |
| 1092 | |
| 1093 | // ShiftRows(state) |
| 1094 | oaes_shift_rows( c ); |
| 1095 | |
| 1096 | #ifdef OAES_DEBUG |
| 1097 | if( _ctx->step_cb ) |
| 1098 | _ctx->step_cb( c, "s_row", _ctx->key->num_keys - 1, NULL ); |
| 1099 | #endif // OAES_DEBUG |
| 1100 | |
| 1101 | // AddRoundKey(state, w[Nr*Nb, (Nr+1)*Nb-1]) |
| 1102 | for( _i = 0; _i < c_len; _i++ ) |
| 1103 | c[_i] = c[_i] ^ _ctx->key->exp_data[ |
| 1104 | ( _ctx->key->num_keys - 1 ) * OAES_RKEY_LEN * OAES_COL_LEN + _i ]; |
| 1105 | |
| 1106 | #ifdef OAES_DEBUG |
| 1107 | if( _ctx->step_cb ) |
| 1108 | { |
| 1109 | _ctx->step_cb( _ctx->key->exp_data + |
| 1110 | ( _ctx->key->num_keys - 1 ) * OAES_RKEY_LEN * OAES_COL_LEN, |
| 1111 | "k_sch", _ctx->key->num_keys - 1, NULL ); |
| 1112 | _ctx->step_cb( c, "output", _ctx->key->num_keys - 1, NULL ); |
| 1113 | } |
| 1114 | #endif // OAES_DEBUG |
| 1115 | |
| 1116 | return OAES_RET_SUCCESS; |
| 1117 | } |
| 1118 | |
| 1119 | static OAES_RET oaes_decrypt_block( |
| 1120 | OAES_CTX * ctx, uint8_t * c, size_t c_len ) |
| 1121 | { |
| 1122 | size_t _i, _j; |
| 1123 | oaes_ctx * _ctx = (oaes_ctx *) ctx; |
| 1124 | |
| 1125 | if( NULL == _ctx ) |
| 1126 | return OAES_RET_ARG1; |
| 1127 | |
| 1128 | if( NULL == c ) |
| 1129 | return OAES_RET_ARG2; |
| 1130 | |
| 1131 | if( c_len != OAES_BLOCK_SIZE ) |
| 1132 | return OAES_RET_ARG3; |
| 1133 | |
| 1134 | if( NULL == _ctx->key ) |
| 1135 | return OAES_RET_NOKEY; |
| 1136 | |
| 1137 | #ifdef OAES_DEBUG |
| 1138 | if( _ctx->step_cb ) |
| 1139 | _ctx->step_cb( c, "iinput", _ctx->key->num_keys - 1, NULL ); |
| 1140 | #endif // OAES_DEBUG |
| 1141 | |
| 1142 | // AddRoundKey(state, w[Nr*Nb, (Nr+1)*Nb-1]) |
| 1143 | for( _i = 0; _i < c_len; _i++ ) |
| 1144 | c[_i] = c[_i] ^ _ctx->key->exp_data[ |
| 1145 | ( _ctx->key->num_keys - 1 ) * OAES_RKEY_LEN * OAES_COL_LEN + _i ]; |
| 1146 | |
| 1147 | #ifdef OAES_DEBUG |
| 1148 | if( _ctx->step_cb ) |
| 1149 | { |
| 1150 | _ctx->step_cb( _ctx->key->exp_data + |
| 1151 | ( _ctx->key->num_keys - 1 ) * OAES_RKEY_LEN * OAES_COL_LEN, |
| 1152 | "ik_sch", _ctx->key->num_keys - 1, NULL ); |
| 1153 | _ctx->step_cb( c, "ik_add", _ctx->key->num_keys - 1, NULL ); |
| 1154 | } |
| 1155 | #endif // OAES_DEBUG |
| 1156 | |
| 1157 | for( _i = _ctx->key->num_keys - 2; _i > 0; _i-- ) |
| 1158 | { |
| 1159 | // InvShiftRows(state) |
| 1160 | oaes_inv_shift_rows( c ); |
| 1161 | |
| 1162 | #ifdef OAES_DEBUG |
| 1163 | if( _ctx->step_cb ) |
| 1164 | _ctx->step_cb( c, "is_row", _i, NULL ); |
| 1165 | #endif // OAES_DEBUG |
| 1166 | |
| 1167 | // InvSubBytes(state) |
| 1168 | for( _j = 0; _j < c_len; _j++ ) |
| 1169 | oaes_inv_sub_byte( c + _j ); |
| 1170 | |
| 1171 | #ifdef OAES_DEBUG |
| 1172 | if( _ctx->step_cb ) |
| 1173 | _ctx->step_cb( c, "is_box", _i, NULL ); |
| 1174 | #endif // OAES_DEBUG |
| 1175 | |
| 1176 | // AddRoundKey(state, w[round*Nb, (round+1)*Nb-1]) |
| 1177 | for( _j = 0; _j < c_len; _j++ ) |
| 1178 | c[_j] = c[_j] ^ |
| 1179 | _ctx->key->exp_data[_i * OAES_RKEY_LEN * OAES_COL_LEN + _j]; |
| 1180 | |
| 1181 | #ifdef OAES_DEBUG |
| 1182 | if( _ctx->step_cb ) |
| 1183 | { |
| 1184 | _ctx->step_cb( _ctx->key->exp_data + _i * OAES_RKEY_LEN * OAES_COL_LEN, |
| 1185 | "ik_sch", _i, NULL ); |
| 1186 | _ctx->step_cb( c, "ik_add", _i, NULL ); |
| 1187 | } |
| 1188 | #endif // OAES_DEBUG |
| 1189 | |
| 1190 | // InvMixColums(state) |
| 1191 | oaes_inv_mix_cols( c ); |
| 1192 | oaes_inv_mix_cols( c + 4 ); |
| 1193 | oaes_inv_mix_cols( c + 8 ); |
| 1194 | oaes_inv_mix_cols( c + 12 ); |
| 1195 | |
| 1196 | #ifdef OAES_DEBUG |
| 1197 | if( _ctx->step_cb ) |
| 1198 | _ctx->step_cb( c, "im_col", _i, NULL ); |
| 1199 | #endif // OAES_DEBUG |
| 1200 | |
| 1201 | } |
| 1202 | |
| 1203 | // InvShiftRows(state) |
| 1204 | oaes_inv_shift_rows( c ); |
| 1205 | |
| 1206 | #ifdef OAES_DEBUG |
| 1207 | if( _ctx->step_cb ) |
| 1208 | _ctx->step_cb( c, "is_row", 1, NULL ); |
| 1209 | #endif // OAES_DEBUG |
| 1210 | |
| 1211 | // InvSubBytes(state) |
| 1212 | for( _i = 0; _i < c_len; _i++ ) |
| 1213 | oaes_inv_sub_byte( c + _i ); |
| 1214 | |
| 1215 | #ifdef OAES_DEBUG |
| 1216 | if( _ctx->step_cb ) |
| 1217 | _ctx->step_cb( c, "is_box", 1, NULL ); |
| 1218 | #endif // OAES_DEBUG |
| 1219 | |
| 1220 | // AddRoundKey(state, w[0, Nb-1]) |
| 1221 | for( _i = 0; _i < c_len; _i++ ) |
| 1222 | c[_i] = c[_i] ^ _ctx->key->exp_data[_i]; |
| 1223 | |
| 1224 | #ifdef OAES_DEBUG |
| 1225 | if( _ctx->step_cb ) |
| 1226 | { |
| 1227 | _ctx->step_cb( _ctx->key->exp_data, "ik_sch", 1, NULL ); |
| 1228 | _ctx->step_cb( c, "ioutput", 1, NULL ); |
| 1229 | } |
| 1230 | #endif // OAES_DEBUG |
| 1231 | |
| 1232 | return OAES_RET_SUCCESS; |
| 1233 | } |
| 1234 | |
| 1235 | OAES_RET oaes_encrypt( OAES_CTX * ctx, |
| 1236 | const uint8_t * m, size_t m_len, uint8_t * c, size_t * c_len ) |
| 1237 | { |
| 1238 | size_t _i, _j, _c_len_in, _c_data_len; |
| 1239 | size_t _pad_len = m_len % OAES_BLOCK_SIZE == 0 ? |
| 1240 | 0 : OAES_BLOCK_SIZE - m_len % OAES_BLOCK_SIZE; |
| 1241 | oaes_ctx * _ctx = (oaes_ctx *) ctx; |
| 1242 | OAES_RET _rc = OAES_RET_SUCCESS; |
| 1243 | uint8_t _flags = _pad_len ? OAES_FLAG_PAD : 0; |
| 1244 | |
| 1245 | if( NULL == _ctx ) |
| 1246 | return OAES_RET_ARG1; |
| 1247 | |
| 1248 | if( NULL == m ) |
| 1249 | return OAES_RET_ARG2; |
| 1250 | |
| 1251 | if( NULL == c_len ) |
| 1252 | return OAES_RET_ARG5; |
| 1253 | |
| 1254 | _c_len_in = *c_len; |
| 1255 | // data + pad |
| 1256 | _c_data_len = m_len + _pad_len; |
| 1257 | // header + iv + data + pad |
| 1258 | *c_len = 2 * OAES_BLOCK_SIZE + m_len + _pad_len; |
| 1259 | |
| 1260 | if( NULL == c ) |
| 1261 | return OAES_RET_SUCCESS; |
| 1262 | |
| 1263 | if( _c_len_in < *c_len ) |
| 1264 | return OAES_RET_BUF; |
| 1265 | |
| 1266 | if( NULL == _ctx->key ) |
| 1267 | return OAES_RET_NOKEY; |
| 1268 | |
| 1269 | // header |
| 1270 | memcpy(c, oaes_header, OAES_BLOCK_SIZE ); |
| 1271 | memcpy(c + 6, &_ctx->options, sizeof(_ctx->options)); |
| 1272 | memcpy(c + 8, &_flags, sizeof(_flags)); |
| 1273 | // iv |
| 1274 | memcpy(c + OAES_BLOCK_SIZE, _ctx->iv, OAES_BLOCK_SIZE ); |
| 1275 | // data |
| 1276 | memcpy(c + 2 * OAES_BLOCK_SIZE, m, m_len ); |
| 1277 | |
| 1278 | for( _i = 0; _i < _c_data_len; _i += OAES_BLOCK_SIZE ) |
| 1279 | { |
| 1280 | uint8_t _block[OAES_BLOCK_SIZE]; |
| 1281 | size_t _block_size = min( m_len - _i, OAES_BLOCK_SIZE ); |
| 1282 | |
| 1283 | memcpy( _block, c + 2 * OAES_BLOCK_SIZE + _i, _block_size ); |
| 1284 | |
| 1285 | // insert pad |
| 1286 | for( _j = 0; _j < OAES_BLOCK_SIZE - _block_size; _j++ ) |
| 1287 | _block[ _block_size + _j ] = _j + 1; |
| 1288 | |
| 1289 | // CBC |
| 1290 | if( _ctx->options & OAES_OPTION_CBC ) |
| 1291 | { |
| 1292 | for( _j = 0; _j < OAES_BLOCK_SIZE; _j++ ) |
| 1293 | _block[_j] = _block[_j] ^ _ctx->iv[_j]; |
| 1294 | } |
| 1295 | |
| 1296 | _rc = _rc || |
| 1297 | oaes_encrypt_block( ctx, _block, OAES_BLOCK_SIZE ); |
| 1298 | memcpy( c + 2 * OAES_BLOCK_SIZE + _i, _block, OAES_BLOCK_SIZE ); |
| 1299 | |
| 1300 | if( _ctx->options & OAES_OPTION_CBC ) |
| 1301 | memcpy( _ctx->iv, _block, OAES_BLOCK_SIZE ); |
| 1302 | } |
| 1303 | |
| 1304 | return _rc; |
| 1305 | } |
| 1306 | |
| 1307 | OAES_RET oaes_decrypt( OAES_CTX * ctx, |
| 1308 | const uint8_t * c, size_t c_len, uint8_t * m, size_t * m_len ) |
| 1309 | { |
| 1310 | size_t _i, _j, _m_len_in; |
| 1311 | oaes_ctx * _ctx = (oaes_ctx *) ctx; |
| 1312 | OAES_RET _rc = OAES_RET_SUCCESS; |
| 1313 | uint8_t _iv[OAES_BLOCK_SIZE]; |
| 1314 | uint8_t _flags; |
| 1315 | OAES_OPTION _options; |
| 1316 | |
| 1317 | if( NULL == ctx ) |
| 1318 | return OAES_RET_ARG1; |
| 1319 | |
| 1320 | if( NULL == c ) |
| 1321 | return OAES_RET_ARG2; |
| 1322 | |
| 1323 | if( c_len % OAES_BLOCK_SIZE ) |
| 1324 | return OAES_RET_ARG3; |
| 1325 | |
| 1326 | if( NULL == m_len ) |
| 1327 | return OAES_RET_ARG5; |
| 1328 | |
| 1329 | _m_len_in = *m_len; |
| 1330 | *m_len = c_len - 2 * OAES_BLOCK_SIZE; |
| 1331 | |
| 1332 | if( NULL == m ) |
| 1333 | return OAES_RET_SUCCESS; |
| 1334 | |
| 1335 | if( _m_len_in < *m_len ) |
| 1336 | return OAES_RET_BUF; |
| 1337 | |
| 1338 | if( NULL == _ctx->key ) |
| 1339 | return OAES_RET_NOKEY; |
| 1340 | |
| 1341 | // header |
| 1342 | if( 0 != memcmp( c, oaes_header, 4 ) ) |
| 1343 | return OAES_RET_HEADER; |
| 1344 | |
| 1345 | // header version |
| 1346 | switch( c[4] ) |
| 1347 | { |
| 1348 | case 0x01: |
| 1349 | break; |
| 1350 | default: |
| 1351 | return OAES_RET_HEADER; |
| 1352 | } |
| 1353 | |
| 1354 | // header type |
| 1355 | switch( c[5] ) |
| 1356 | { |
| 1357 | case 0x02: |
| 1358 | break; |
| 1359 | default: |
| 1360 | return OAES_RET_HEADER; |
| 1361 | } |
| 1362 | |
| 1363 | // options |
| 1364 | memcpy(&_options, c + 6, sizeof(_options)); |
| 1365 | // validate that all options are valid |
| 1366 | if( _options & ~( |
| 1367 | OAES_OPTION_ECB |
| 1368 | | OAES_OPTION_CBC |
| 1369 | #ifdef OAES_DEBUG |
| 1370 | | OAES_OPTION_STEP_ON |
| 1371 | | OAES_OPTION_STEP_OFF |
| 1372 | #endif // OAES_DEBUG |
| 1373 | ) ) |
| 1374 | return OAES_RET_HEADER; |
| 1375 | if( ( _options & OAES_OPTION_ECB ) && |
| 1376 | ( _options & OAES_OPTION_CBC ) ) |
| 1377 | return OAES_RET_HEADER; |
| 1378 | if( _options == OAES_OPTION_NONE ) |
| 1379 | return OAES_RET_HEADER; |
| 1380 | |
| 1381 | // flags |
| 1382 | memcpy(&_flags, c + 8, sizeof(_flags)); |
| 1383 | // validate that all flags are valid |
| 1384 | if( _flags & ~( |
| 1385 | OAES_FLAG_PAD |
| 1386 | ) ) |
| 1387 | return OAES_RET_HEADER; |
| 1388 | |
| 1389 | // iv |
| 1390 | memcpy( _iv, c + OAES_BLOCK_SIZE, OAES_BLOCK_SIZE); |
| 1391 | // data + pad |
| 1392 | memcpy( m, c + 2 * OAES_BLOCK_SIZE, *m_len ); |
| 1393 | |
| 1394 | for( _i = 0; _i < *m_len; _i += OAES_BLOCK_SIZE ) |
| 1395 | { |
| 1396 | if( ( _options & OAES_OPTION_CBC ) && _i > 0 ) |
| 1397 | memcpy( _iv, c + OAES_BLOCK_SIZE + _i, OAES_BLOCK_SIZE ); |
| 1398 | |
| 1399 | _rc = _rc || |
| 1400 | oaes_decrypt_block( ctx, m + _i, min( *m_len - _i, OAES_BLOCK_SIZE ) ); |
| 1401 | |
| 1402 | // CBC |
| 1403 | if( _options & OAES_OPTION_CBC ) |
| 1404 | { |
| 1405 | for( _j = 0; _j < OAES_BLOCK_SIZE; _j++ ) |
| 1406 | m[ _i + _j ] = m[ _i + _j ] ^ _iv[_j]; |
| 1407 | } |
| 1408 | } |
| 1409 | |
| 1410 | // remove pad |
| 1411 | if( _flags & OAES_FLAG_PAD ) |
| 1412 | { |
| 1413 | int _is_pad = 1; |
| 1414 | size_t _temp = (size_t) m[*m_len - 1]; |
| 1415 | |
| 1416 | if( _temp <= 0x00 || _temp > 0x0f ) |
| 1417 | return OAES_RET_HEADER; |
| 1418 | for( _i = 0; _i < _temp; _i++ ) |
| 1419 | if( m[*m_len - 1 - _i] != _temp - _i ) |
| 1420 | _is_pad = 0; |
| 1421 | if( _is_pad ) |
| 1422 | { |
| 1423 | memset( m + *m_len - _temp, 0, _temp ); |
| 1424 | *m_len -= _temp; |
| 1425 | } |
| 1426 | else |
| 1427 | return OAES_RET_HEADER; |
| 1428 | } |
| 1429 | |
| 1430 | return OAES_RET_SUCCESS; |
| 1431 | } |