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MastersThesis/PQ_TIIGER_TLS/sal/miracl-ubuntu22-11-04-24/includes/aes.cpp

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update tiigertls
2024-04-15 09:53:30 +00:00
/*
* Copyright (c) 2012-2020 MIRACL UK Ltd.
*
* This file is part of MIRACL Core
* (see https://github.com/miracl/core).
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Implementation of the NIST Advanced Ecryption Standard
*
* SU=m, SU is Stack Usage
*/
#include <stdlib.h>
#include "arch.h"
#include "core.h"
using namespace core;
/* this is fixed */
#define NB 4
/* Rotates 32-bit word left by 1, 2 or 3 byte */
#define ROTL8(x) (((x)<<8)|((x)>>24))
#define ROTL16(x) (((x)<<16)|((x)>>16))
#define ROTL24(x) (((x)<<24)|((x)>>8))
static const uchar InCo[4] = {0xB, 0xD, 0x9, 0xE}; /* Inverse Coefficients */
static const uchar ptab[] =
{
1, 3, 5, 15, 17, 51, 85, 255, 26, 46, 114, 150, 161, 248, 19, 53,
95, 225, 56, 72, 216, 115, 149, 164, 247, 2, 6, 10, 30, 34, 102, 170,
229, 52, 92, 228, 55, 89, 235, 38, 106, 190, 217, 112, 144, 171, 230, 49,
83, 245, 4, 12, 20, 60, 68, 204, 79, 209, 104, 184, 211, 110, 178, 205,
76, 212, 103, 169, 224, 59, 77, 215, 98, 166, 241, 8, 24, 40, 120, 136,
131, 158, 185, 208, 107, 189, 220, 127, 129, 152, 179, 206, 73, 219, 118, 154,
181, 196, 87, 249, 16, 48, 80, 240, 11, 29, 39, 105, 187, 214, 97, 163,
254, 25, 43, 125, 135, 146, 173, 236, 47, 113, 147, 174, 233, 32, 96, 160,
251, 22, 58, 78, 210, 109, 183, 194, 93, 231, 50, 86, 250, 21, 63, 65,
195, 94, 226, 61, 71, 201, 64, 192, 91, 237, 44, 116, 156, 191, 218, 117,
159, 186, 213, 100, 172, 239, 42, 126, 130, 157, 188, 223, 122, 142, 137, 128,
155, 182, 193, 88, 232, 35, 101, 175, 234, 37, 111, 177, 200, 67, 197, 84,
252, 31, 33, 99, 165, 244, 7, 9, 27, 45, 119, 153, 176, 203, 70, 202,
69, 207, 74, 222, 121, 139, 134, 145, 168, 227, 62, 66, 198, 81, 243, 14,
18, 54, 90, 238, 41, 123, 141, 140, 143, 138, 133, 148, 167, 242, 13, 23,
57, 75, 221, 124, 132, 151, 162, 253, 28, 36, 108, 180, 199, 82, 246, 1
};
static const uchar ltab[] =
{
0, 255, 25, 1, 50, 2, 26, 198, 75, 199, 27, 104, 51, 238, 223, 3,
100, 4, 224, 14, 52, 141, 129, 239, 76, 113, 8, 200, 248, 105, 28, 193,
125, 194, 29, 181, 249, 185, 39, 106, 77, 228, 166, 114, 154, 201, 9, 120,
101, 47, 138, 5, 33, 15, 225, 36, 18, 240, 130, 69, 53, 147, 218, 142,
150, 143, 219, 189, 54, 208, 206, 148, 19, 92, 210, 241, 64, 70, 131, 56,
102, 221, 253, 48, 191, 6, 139, 98, 179, 37, 226, 152, 34, 136, 145, 16,
126, 110, 72, 195, 163, 182, 30, 66, 58, 107, 40, 84, 250, 133, 61, 186,
43, 121, 10, 21, 155, 159, 94, 202, 78, 212, 172, 229, 243, 115, 167, 87,
175, 88, 168, 80, 244, 234, 214, 116, 79, 174, 233, 213, 231, 230, 173, 232,
44, 215, 117, 122, 235, 22, 11, 245, 89, 203, 95, 176, 156, 169, 81, 160,
127, 12, 246, 111, 23, 196, 73, 236, 216, 67, 31, 45, 164, 118, 123, 183,
204, 187, 62, 90, 251, 96, 177, 134, 59, 82, 161, 108, 170, 85, 41, 157,
151, 178, 135, 144, 97, 190, 220, 252, 188, 149, 207, 205, 55, 63, 91, 209,
83, 57, 132, 60, 65, 162, 109, 71, 20, 42, 158, 93, 86, 242, 211, 171,
68, 17, 146, 217, 35, 32, 46, 137, 180, 124, 184, 38, 119, 153, 227, 165,
103, 74, 237, 222, 197, 49, 254, 24, 13, 99, 140, 128, 192, 247, 112, 7
};
static const uchar fbsub[] =
{
99, 124, 119, 123, 242, 107, 111, 197, 48, 1, 103, 43, 254, 215, 171, 118,
202, 130, 201, 125, 250, 89, 71, 240, 173, 212, 162, 175, 156, 164, 114, 192,
183, 253, 147, 38, 54, 63, 247, 204, 52, 165, 229, 241, 113, 216, 49, 21,
4, 199, 35, 195, 24, 150, 5, 154, 7, 18, 128, 226, 235, 39, 178, 117,
9, 131, 44, 26, 27, 110, 90, 160, 82, 59, 214, 179, 41, 227, 47, 132,
83, 209, 0, 237, 32, 252, 177, 91, 106, 203, 190, 57, 74, 76, 88, 207,
208, 239, 170, 251, 67, 77, 51, 133, 69, 249, 2, 127, 80, 60, 159, 168,
81, 163, 64, 143, 146, 157, 56, 245, 188, 182, 218, 33, 16, 255, 243, 210,
205, 12, 19, 236, 95, 151, 68, 23, 196, 167, 126, 61, 100, 93, 25, 115,
96, 129, 79, 220, 34, 42, 144, 136, 70, 238, 184, 20, 222, 94, 11, 219,
224, 50, 58, 10, 73, 6, 36, 92, 194, 211, 172, 98, 145, 149, 228, 121,
231, 200, 55, 109, 141, 213, 78, 169, 108, 86, 244, 234, 101, 122, 174, 8,
186, 120, 37, 46, 28, 166, 180, 198, 232, 221, 116, 31, 75, 189, 139, 138,
112, 62, 181, 102, 72, 3, 246, 14, 97, 53, 87, 185, 134, 193, 29, 158,
225, 248, 152, 17, 105, 217, 142, 148, 155, 30, 135, 233, 206, 85, 40, 223,
140, 161, 137, 13, 191, 230, 66, 104, 65, 153, 45, 15, 176, 84, 187, 22
};
static const uchar rbsub[] =
{
82, 9, 106, 213, 48, 54, 165, 56, 191, 64, 163, 158, 129, 243, 215, 251,
124, 227, 57, 130, 155, 47, 255, 135, 52, 142, 67, 68, 196, 222, 233, 203,
84, 123, 148, 50, 166, 194, 35, 61, 238, 76, 149, 11, 66, 250, 195, 78,
8, 46, 161, 102, 40, 217, 36, 178, 118, 91, 162, 73, 109, 139, 209, 37,
114, 248, 246, 100, 134, 104, 152, 22, 212, 164, 92, 204, 93, 101, 182, 146,
108, 112, 72, 80, 253, 237, 185, 218, 94, 21, 70, 87, 167, 141, 157, 132,
144, 216, 171, 0, 140, 188, 211, 10, 247, 228, 88, 5, 184, 179, 69, 6,
208, 44, 30, 143, 202, 63, 15, 2, 193, 175, 189, 3, 1, 19, 138, 107,
58, 145, 17, 65, 79, 103, 220, 234, 151, 242, 207, 206, 240, 180, 230, 115,
150, 172, 116, 34, 231, 173, 53, 133, 226, 249, 55, 232, 28, 117, 223, 110,
71, 241, 26, 113, 29, 41, 197, 137, 111, 183, 98, 14, 170, 24, 190, 27,
252, 86, 62, 75, 198, 210, 121, 32, 154, 219, 192, 254, 120, 205, 90, 244,
31, 221, 168, 51, 136, 7, 199, 49, 177, 18, 16, 89, 39, 128, 236, 95,
96, 81, 127, 169, 25, 181, 74, 13, 45, 229, 122, 159, 147, 201, 156, 239,
160, 224, 59, 77, 174, 42, 245, 176, 200, 235, 187, 60, 131, 83, 153, 97,
23, 43, 4, 126, 186, 119, 214, 38, 225, 105, 20, 99, 85, 33, 12, 125
};
static const unsign32 rco[] =
{1, 2, 4, 8, 16, 32, 64, 128, 27, 54, 108, 216, 171, 77, 154, 47};
static const unsign32 ftable[] =
{
0xa56363c6, 0x847c7cf8, 0x997777ee, 0x8d7b7bf6, 0xdf2f2ff, 0xbd6b6bd6,
0xb16f6fde, 0x54c5c591, 0x50303060, 0x3010102, 0xa96767ce, 0x7d2b2b56,
0x19fefee7, 0x62d7d7b5, 0xe6abab4d, 0x9a7676ec, 0x45caca8f, 0x9d82821f,
0x40c9c989, 0x877d7dfa, 0x15fafaef, 0xeb5959b2, 0xc947478e, 0xbf0f0fb,
0xecadad41, 0x67d4d4b3, 0xfda2a25f, 0xeaafaf45, 0xbf9c9c23, 0xf7a4a453,
0x967272e4, 0x5bc0c09b, 0xc2b7b775, 0x1cfdfde1, 0xae93933d, 0x6a26264c,
0x5a36366c, 0x413f3f7e, 0x2f7f7f5, 0x4fcccc83, 0x5c343468, 0xf4a5a551,
0x34e5e5d1, 0x8f1f1f9, 0x937171e2, 0x73d8d8ab, 0x53313162, 0x3f15152a,
0xc040408, 0x52c7c795, 0x65232346, 0x5ec3c39d, 0x28181830, 0xa1969637,
0xf05050a, 0xb59a9a2f, 0x907070e, 0x36121224, 0x9b80801b, 0x3de2e2df,
0x26ebebcd, 0x6927274e, 0xcdb2b27f, 0x9f7575ea, 0x1b090912, 0x9e83831d,
0x742c2c58, 0x2e1a1a34, 0x2d1b1b36, 0xb26e6edc, 0xee5a5ab4, 0xfba0a05b,
0xf65252a4, 0x4d3b3b76, 0x61d6d6b7, 0xceb3b37d, 0x7b292952, 0x3ee3e3dd,
0x712f2f5e, 0x97848413, 0xf55353a6, 0x68d1d1b9, 0x0, 0x2cededc1,
0x60202040, 0x1ffcfce3, 0xc8b1b179, 0xed5b5bb6, 0xbe6a6ad4, 0x46cbcb8d,
0xd9bebe67, 0x4b393972, 0xde4a4a94, 0xd44c4c98, 0xe85858b0, 0x4acfcf85,
0x6bd0d0bb, 0x2aefefc5, 0xe5aaaa4f, 0x16fbfbed, 0xc5434386, 0xd74d4d9a,
0x55333366, 0x94858511, 0xcf45458a, 0x10f9f9e9, 0x6020204, 0x817f7ffe,
0xf05050a0, 0x443c3c78, 0xba9f9f25, 0xe3a8a84b, 0xf35151a2, 0xfea3a35d,
0xc0404080, 0x8a8f8f05, 0xad92923f, 0xbc9d9d21, 0x48383870, 0x4f5f5f1,
0xdfbcbc63, 0xc1b6b677, 0x75dadaaf, 0x63212142, 0x30101020, 0x1affffe5,
0xef3f3fd, 0x6dd2d2bf, 0x4ccdcd81, 0x140c0c18, 0x35131326, 0x2fececc3,
0xe15f5fbe, 0xa2979735, 0xcc444488, 0x3917172e, 0x57c4c493, 0xf2a7a755,
0x827e7efc, 0x473d3d7a, 0xac6464c8, 0xe75d5dba, 0x2b191932, 0x957373e6,
0xa06060c0, 0x98818119, 0xd14f4f9e, 0x7fdcdca3, 0x66222244, 0x7e2a2a54,
0xab90903b, 0x8388880b, 0xca46468c, 0x29eeeec7, 0xd3b8b86b, 0x3c141428,
0x79dedea7, 0xe25e5ebc, 0x1d0b0b16, 0x76dbdbad, 0x3be0e0db, 0x56323264,
0x4e3a3a74, 0x1e0a0a14, 0xdb494992, 0xa06060c, 0x6c242448, 0xe45c5cb8,
0x5dc2c29f, 0x6ed3d3bd, 0xefacac43, 0xa66262c4, 0xa8919139, 0xa4959531,
0x37e4e4d3, 0x8b7979f2, 0x32e7e7d5, 0x43c8c88b, 0x5937376e, 0xb76d6dda,
0x8c8d8d01, 0x64d5d5b1, 0xd24e4e9c, 0xe0a9a949, 0xb46c6cd8, 0xfa5656ac,
0x7f4f4f3, 0x25eaeacf, 0xaf6565ca, 0x8e7a7af4, 0xe9aeae47, 0x18080810,
0xd5baba6f, 0x887878f0, 0x6f25254a, 0x722e2e5c, 0x241c1c38, 0xf1a6a657,
0xc7b4b473, 0x51c6c697, 0x23e8e8cb, 0x7cdddda1, 0x9c7474e8, 0x211f1f3e,
0xdd4b4b96, 0xdcbdbd61, 0x868b8b0d, 0x858a8a0f, 0x907070e0, 0x423e3e7c,
0xc4b5b571, 0xaa6666cc, 0xd8484890, 0x5030306, 0x1f6f6f7, 0x120e0e1c,
0xa36161c2, 0x5f35356a, 0xf95757ae, 0xd0b9b969, 0x91868617, 0x58c1c199,
0x271d1d3a, 0xb99e9e27, 0x38e1e1d9, 0x13f8f8eb, 0xb398982b, 0x33111122,
0xbb6969d2, 0x70d9d9a9, 0x898e8e07, 0xa7949433, 0xb69b9b2d, 0x221e1e3c,
0x92878715, 0x20e9e9c9, 0x49cece87, 0xff5555aa, 0x78282850, 0x7adfdfa5,
0x8f8c8c03, 0xf8a1a159, 0x80898909, 0x170d0d1a, 0xdabfbf65, 0x31e6e6d7,
0xc6424284, 0xb86868d0, 0xc3414182, 0xb0999929, 0x772d2d5a, 0x110f0f1e,
0xcbb0b07b, 0xfc5454a8, 0xd6bbbb6d, 0x3a16162c
};
static const unsign32 rtable[] =
{
0x50a7f451, 0x5365417e, 0xc3a4171a, 0x965e273a, 0xcb6bab3b, 0xf1459d1f,
0xab58faac, 0x9303e34b, 0x55fa3020, 0xf66d76ad, 0x9176cc88, 0x254c02f5,
0xfcd7e54f, 0xd7cb2ac5, 0x80443526, 0x8fa362b5, 0x495ab1de, 0x671bba25,
0x980eea45, 0xe1c0fe5d, 0x2752fc3, 0x12f04c81, 0xa397468d, 0xc6f9d36b,
0xe75f8f03, 0x959c9215, 0xeb7a6dbf, 0xda595295, 0x2d83bed4, 0xd3217458,
0x2969e049, 0x44c8c98e, 0x6a89c275, 0x78798ef4, 0x6b3e5899, 0xdd71b927,
0xb64fe1be, 0x17ad88f0, 0x66ac20c9, 0xb43ace7d, 0x184adf63, 0x82311ae5,
0x60335197, 0x457f5362, 0xe07764b1, 0x84ae6bbb, 0x1ca081fe, 0x942b08f9,
0x58684870, 0x19fd458f, 0x876cde94, 0xb7f87b52, 0x23d373ab, 0xe2024b72,
0x578f1fe3, 0x2aab5566, 0x728ebb2, 0x3c2b52f, 0x9a7bc586, 0xa50837d3,
0xf2872830, 0xb2a5bf23, 0xba6a0302, 0x5c8216ed, 0x2b1ccf8a, 0x92b479a7,
0xf0f207f3, 0xa1e2694e, 0xcdf4da65, 0xd5be0506, 0x1f6234d1, 0x8afea6c4,
0x9d532e34, 0xa055f3a2, 0x32e18a05, 0x75ebf6a4, 0x39ec830b, 0xaaef6040,
0x69f715e, 0x51106ebd, 0xf98a213e, 0x3d06dd96, 0xae053edd, 0x46bde64d,
0xb58d5491, 0x55dc471, 0x6fd40604, 0xff155060, 0x24fb9819, 0x97e9bdd6,
0xcc434089, 0x779ed967, 0xbd42e8b0, 0x888b8907, 0x385b19e7, 0xdbeec879,
0x470a7ca1, 0xe90f427c, 0xc91e84f8, 0x0, 0x83868009, 0x48ed2b32,
0xac70111e, 0x4e725a6c, 0xfbff0efd, 0x5638850f, 0x1ed5ae3d, 0x27392d36,
0x64d90f0a, 0x21a65c68, 0xd1545b9b, 0x3a2e3624, 0xb1670a0c, 0xfe75793,
0xd296eeb4, 0x9e919b1b, 0x4fc5c080, 0xa220dc61, 0x694b775a, 0x161a121c,
0xaba93e2, 0xe52aa0c0, 0x43e0223c, 0x1d171b12, 0xb0d090e, 0xadc78bf2,
0xb9a8b62d, 0xc8a91e14, 0x8519f157, 0x4c0775af, 0xbbdd99ee, 0xfd607fa3,
0x9f2601f7, 0xbcf5725c, 0xc53b6644, 0x347efb5b, 0x7629438b, 0xdcc623cb,
0x68fcedb6, 0x63f1e4b8, 0xcadc31d7, 0x10856342, 0x40229713, 0x2011c684,
0x7d244a85, 0xf83dbbd2, 0x1132f9ae, 0x6da129c7, 0x4b2f9e1d, 0xf330b2dc,
0xec52860d, 0xd0e3c177, 0x6c16b32b, 0x99b970a9, 0xfa489411, 0x2264e947,
0xc48cfca8, 0x1a3ff0a0, 0xd82c7d56, 0xef903322, 0xc74e4987, 0xc1d138d9,
0xfea2ca8c, 0x360bd498, 0xcf81f5a6, 0x28de7aa5, 0x268eb7da, 0xa4bfad3f,
0xe49d3a2c, 0xd927850, 0x9bcc5f6a, 0x62467e54, 0xc2138df6, 0xe8b8d890,
0x5ef7392e, 0xf5afc382, 0xbe805d9f, 0x7c93d069, 0xa92dd56f, 0xb31225cf,
0x3b99acc8, 0xa77d1810, 0x6e639ce8, 0x7bbb3bdb, 0x97826cd, 0xf418596e,
0x1b79aec, 0xa89a4f83, 0x656e95e6, 0x7ee6ffaa, 0x8cfbc21, 0xe6e815ef,
0xd99be7ba, 0xce366f4a, 0xd4099fea, 0xd67cb029, 0xafb2a431, 0x31233f2a,
0x3094a5c6, 0xc066a235, 0x37bc4e74, 0xa6ca82fc, 0xb0d090e0, 0x15d8a733,
0x4a9804f1, 0xf7daec41, 0xe50cd7f, 0x2ff69117, 0x8dd64d76, 0x4db0ef43,
0x544daacc, 0xdf0496e4, 0xe3b5d19e, 0x1b886a4c, 0xb81f2cc1, 0x7f516546,
0x4ea5e9d, 0x5d358c01, 0x737487fa, 0x2e410bfb, 0x5a1d67b3, 0x52d2db92,
0x335610e9, 0x1347d66d, 0x8c61d79a, 0x7a0ca137, 0x8e14f859, 0x893c13eb,
0xee27a9ce, 0x35c961b7, 0xede51ce1, 0x3cb1477a, 0x59dfd29c, 0x3f73f255,
0x79ce1418, 0xbf37c773, 0xeacdf753, 0x5baafd5f, 0x146f3ddf, 0x86db4478,
0x81f3afca, 0x3ec468b9, 0x2c342438, 0x5f40a3c2, 0x72c31d16, 0xc25e2bc,
0x8b493c28, 0x41950dff, 0x7101a839, 0xdeb30c08, 0x9ce4b4d8, 0x90c15664,
0x6184cb7b, 0x70b632d5, 0x745c6c48, 0x4257b8d0
};
#define MR_TOBYTE(x) ((uchar)((x)))
static unsign32 pack(const uchar *b)
{
/* pack bytes into a 32-bit Word */
return ((unsign32)b[3] << 24) | ((unsign32)b[2] << 16) | ((unsign32)b[1] << 8) | (unsign32)b[0];
}
static void unpack(unsign32 a, uchar *b)
{
/* unpack bytes from a word */
b[0] = MR_TOBYTE(a);
b[1] = MR_TOBYTE(a >> 8);
b[2] = MR_TOBYTE(a >> 16);
b[3] = MR_TOBYTE(a >> 24);
}
/* SU= 8 */
static uchar bmul(uchar x, uchar y)
{
/* x.y= AntiLog(Log(x) + Log(y)) */
if (x && y) return ptab[(ltab[x] + ltab[y]) % 255];
else return 0;
}
static unsign32 SubByte(unsign32 a)
{
uchar b[4];
unpack(a, b);
b[0] = fbsub[b[0]];
b[1] = fbsub[b[1]];
b[2] = fbsub[b[2]];
b[3] = fbsub[b[3]];
return pack(b);
}
/* SU= 16 */
static uchar product(unsign32 x, unsign32 y)
{
/* dot product of two 4-byte arrays */
uchar xb[4], yb[4];
unpack(x, xb);
unpack(y, yb);
return bmul(xb[0], yb[0])^bmul(xb[1], yb[1])^bmul(xb[2], yb[2])^bmul(xb[3], yb[3]);
}
static unsign32 InvMixCol(unsign32 x)
{
/* matrix Multiplication */
unsign32 y, m;
uchar b[4];
m = pack(InCo);
b[3] = product(m, x);
m = ROTL24(m);
b[2] = product(m, x);
m = ROTL24(m);
b[1] = product(m, x);
m = ROTL24(m);
b[0] = product(m, x);
y = pack(b);
return y;
}
/* SU= 8 */
/* reset cipher */
void core::AES_reset(core::aes *a, int mode, char *iv)
{
/* reset mode, or reset iv */
int i;
a->mode = mode;
for (i = 0; i < 4 * NB; i++)
a->f[i] = 0;
if (mode != ECB && iv != NULL)
{
for (i = 0; i < 4 * NB; i++)
a->f[i] = iv[i];
}
}
void core::AES_getreg(core::aes *a, char *ir)
{
int i;
for (i = 0; i < 4 * NB; i++) ir[i] = a->f[i];
}
/* SU= 72 */
/* Initialise cipher */
int core::AES_init(core::aes* a, int mode, int nk, char *key, char *iv)
{
/* Key length Nk=16, 24 or 32 bytes */
/* Key Scheduler. Create expanded encryption key */
int i, j, k, N, nr;
unsign32 CipherKey[8];
nk /= 4;
if (nk != 4 && nk != 6 && nk != 8) return 0;
nr = 6 + nk;
a->Nk = nk;
a->Nr = nr;
AES_reset(a, mode, iv);
N = NB * (nr + 1);
for (i = j = 0; i < nk; i++, j += 4)
{
CipherKey[i] = pack((uchar *)&key[j]);
}
for (i = 0; i < nk; i++) a->fkey[i] = CipherKey[i];
for (j = nk, k = 0; j < N; j += nk, k++)
{
a->fkey[j] = a->fkey[j - nk] ^ SubByte(ROTL24(a->fkey[j - 1]))^rco[k];
if (nk <= 6)
{
for (i = 1; i < nk && (i + j) < N; i++)
a->fkey[i + j] = a->fkey[i + j - nk] ^ a->fkey[i + j - 1];
}
else
{
for (i = 1; i < 4 && (i + j) < N; i++)
a->fkey[i + j] = a->fkey[i + j - nk] ^ a->fkey[i + j - 1];
if ((j + 4) < N) a->fkey[j + 4] = a->fkey[j + 4 - nk] ^ SubByte(a->fkey[j + 3]);
for (i = 5; i < nk && (i + j) < N; i++)
a->fkey[i + j] = a->fkey[i + j - nk] ^ a->fkey[i + j - 1];
}
}
/* now for the expanded decrypt key in reverse order */
for (j = 0; j < NB; j++) a->rkey[j + N - NB] = a->fkey[j];
for (i = NB; i < N - NB; i += NB)
{
k = N - NB - i;
for (j = 0; j < NB; j++) a->rkey[k + j] = InvMixCol(a->fkey[i + j]);
}
for (j = N - NB; j < N; j++) a->rkey[j - N + NB] = a->fkey[j];
return 1;
}
/* SU= 80 */
/* Encrypt a single block */
void core::AES_ecb_encrypt(core::aes *a, uchar *buff)
{
int i, j, k;
unsign32 p[4], q[4], *x, *y, *t;
for (i = j = 0; i < NB; i++, j += 4)
{
p[i] = pack((uchar *)&buff[j]);
p[i] ^= a->fkey[i];
}
k = NB;
x = p;
y = q;
/* State alternates between x and y */
for (i = 1; i < a->Nr; i++)
{
y[0] = a->fkey[k] ^ ftable[MR_TOBYTE(x[0])] ^
ROTL8(ftable[MR_TOBYTE(x[1] >> 8)])^
ROTL16(ftable[MR_TOBYTE(x[2] >> 16)])^
ROTL24(ftable[x[3] >> 24]);
y[1] = a->fkey[k + 1] ^ ftable[MR_TOBYTE(x[1])] ^
ROTL8(ftable[MR_TOBYTE(x[2] >> 8)])^
ROTL16(ftable[MR_TOBYTE(x[3] >> 16)])^
ROTL24(ftable[x[0] >> 24]);
y[2] = a->fkey[k + 2] ^ ftable[MR_TOBYTE(x[2])] ^
ROTL8(ftable[MR_TOBYTE(x[3] >> 8)])^
ROTL16(ftable[MR_TOBYTE(x[0] >> 16)])^
ROTL24(ftable[x[1] >> 24]);
y[3] = a->fkey[k + 3] ^ ftable[MR_TOBYTE(x[3])] ^
ROTL8(ftable[MR_TOBYTE(x[0] >> 8)])^
ROTL16(ftable[MR_TOBYTE(x[1] >> 16)])^
ROTL24(ftable[x[2] >> 24]);
k += 4;
t = x;
x = y;
y = t; /* swap pointers */
}
/* Last Round */
y[0] = a->fkey[k] ^ (unsign32)fbsub[MR_TOBYTE(x[0])] ^
ROTL8((unsign32)fbsub[MR_TOBYTE(x[1] >> 8)])^
ROTL16((unsign32)fbsub[MR_TOBYTE(x[2] >> 16)])^
ROTL24((unsign32)fbsub[x[3] >> 24]);
y[1] = a->fkey[k + 1] ^ (unsign32)fbsub[MR_TOBYTE(x[1])] ^
ROTL8((unsign32)fbsub[MR_TOBYTE(x[2] >> 8)])^
ROTL16((unsign32)fbsub[MR_TOBYTE(x[3] >> 16)])^
ROTL24((unsign32)fbsub[x[0] >> 24]);
y[2] = a->fkey[k + 2] ^ (unsign32)fbsub[MR_TOBYTE(x[2])] ^
ROTL8((unsign32)fbsub[MR_TOBYTE(x[3] >> 8)])^
ROTL16((unsign32)fbsub[MR_TOBYTE(x[0] >> 16)])^
ROTL24((unsign32)fbsub[x[1] >> 24]);
y[3] = a->fkey[k + 3] ^ (unsign32)fbsub[MR_TOBYTE(x[3])] ^
ROTL8((unsign32)fbsub[MR_TOBYTE(x[0] >> 8)])^
ROTL16((unsign32)fbsub[MR_TOBYTE(x[1] >> 16)])^
ROTL24((unsign32)fbsub[x[2] >> 24]);
for (i = j = 0; i < NB; i++, j += 4)
{
unpack(y[i], (uchar *)&buff[j]);
x[i] = y[i] = 0; /* clean up stack */
}
}
/* SU= 80 */
/* Decrypt a single block */
void core::AES_ecb_decrypt(core::aes *a, uchar *buff)
{
int i, j, k;
unsign32 p[4], q[4], *x, *y, *t;
for (i = j = 0; i < NB; i++, j += 4)
{
p[i] = pack((uchar *)&buff[j]);
p[i] ^= a->rkey[i];
}
k = NB;
x = p;
y = q;
/* State alternates between x and y */
for (i = 1; i < a->Nr; i++)
{
/* Nr is number of rounds. May be odd. */
y[0] = a->rkey[k] ^ rtable[MR_TOBYTE(x[0])] ^
ROTL8(rtable[MR_TOBYTE(x[3] >> 8)])^
ROTL16(rtable[MR_TOBYTE(x[2] >> 16)])^
ROTL24(rtable[x[1] >> 24]);
y[1] = a->rkey[k + 1] ^ rtable[MR_TOBYTE(x[1])] ^
ROTL8(rtable[MR_TOBYTE(x[0] >> 8)])^
ROTL16(rtable[MR_TOBYTE(x[3] >> 16)])^
ROTL24(rtable[x[2] >> 24]);
y[2] = a->rkey[k + 2] ^ rtable[MR_TOBYTE(x[2])] ^
ROTL8(rtable[MR_TOBYTE(x[1] >> 8)])^
ROTL16(rtable[MR_TOBYTE(x[0] >> 16)])^
ROTL24(rtable[x[3] >> 24]);
y[3] = a->rkey[k + 3] ^ rtable[MR_TOBYTE(x[3])] ^
ROTL8(rtable[MR_TOBYTE(x[2] >> 8)])^
ROTL16(rtable[MR_TOBYTE(x[1] >> 16)])^
ROTL24(rtable[x[0] >> 24]);
k += 4;
t = x;
x = y;
y = t; /* swap pointers */
}
/* Last Round */
y[0] = a->rkey[k] ^ (unsign32)rbsub[MR_TOBYTE(x[0])] ^
ROTL8((unsign32)rbsub[MR_TOBYTE(x[3] >> 8)])^
ROTL16((unsign32)rbsub[MR_TOBYTE(x[2] >> 16)])^
ROTL24((unsign32)rbsub[x[1] >> 24]);
y[1] = a->rkey[k + 1] ^ (unsign32)rbsub[MR_TOBYTE(x[1])] ^
ROTL8((unsign32)rbsub[MR_TOBYTE(x[0] >> 8)])^
ROTL16((unsign32)rbsub[MR_TOBYTE(x[3] >> 16)])^
ROTL24((unsign32)rbsub[x[2] >> 24]);
y[2] = a->rkey[k + 2] ^ (unsign32)rbsub[MR_TOBYTE(x[2])] ^
ROTL8((unsign32)rbsub[MR_TOBYTE(x[1] >> 8)])^
ROTL16((unsign32)rbsub[MR_TOBYTE(x[0] >> 16)])^
ROTL24((unsign32)rbsub[x[3] >> 24]);
y[3] = a->rkey[k + 3] ^ (unsign32)rbsub[MR_TOBYTE(x[3])] ^
ROTL8((unsign32)rbsub[MR_TOBYTE(x[2] >> 8)])^
ROTL16((unsign32)rbsub[MR_TOBYTE(x[1] >> 16)])^
ROTL24((unsign32)rbsub[x[0] >> 24]);
for (i = j = 0; i < NB; i++, j += 4)
{
unpack(y[i], (uchar *)&buff[j]);
x[i] = y[i] = 0; /* clean up stack */
}
}
/* simple default increment function */
static void increment(char *f)
{
int i;
for (i = 0; i < 16; i++)
{
f[i]++;
if (f[i] != 0) break;
}
}
/* SU= 40 */
/* Encrypt using selected mode of operation */
unsign32 core::AES_encrypt(core::aes* a, char *buff)
{
int j, bytes;
char st[16];
unsign32 fell_off;
/* Supported Modes of Operation */
fell_off = 0;
switch (a->mode)
{
case ECB:
AES_ecb_encrypt(a, (uchar *)buff);
return 0;
case CBC:
for (j = 0; j < 4 * NB; j++) buff[j] ^= a->f[j];
AES_ecb_encrypt(a, (uchar *)buff);
for (j = 0; j < 4 * NB; j++) a->f[j] = buff[j];
return 0;
case CFB1:
case CFB2:
case CFB4:
bytes = a->mode - CFB1 + 1;
for (j = 0; j < bytes; j++) fell_off = (fell_off << 8) | a->f[j];
for (j = 0; j < 4 * NB; j++) st[j] = a->f[j];
for (j = bytes; j < 4 * NB; j++) a->f[j - bytes] = a->f[j];
AES_ecb_encrypt(a, (uchar *)st);
for (j = 0; j < bytes; j++)
{
buff[j] ^= st[j];
a->f[16 - bytes + j] = buff[j];
}
return fell_off;
case OFB1:
case OFB2:
case OFB4:
case OFB8:
case OFB16:
bytes = a->mode - OFB1 + 1;
AES_ecb_encrypt(a, (uchar *)(a->f));
for (j = 0; j < bytes; j++) buff[j] ^= a->f[j];
return 0;
case CTR1:
case CTR2:
case CTR4:
case CTR8:
case CTR16:
bytes = a->mode - CTR1 + 1;
for (j = 0; j < 4 * NB; j++) st[j] = a->f[j];
AES_ecb_encrypt(a, (uchar *)st);
for (j = 0; j < bytes; j++) buff[j] ^= st[j];
increment(a->f);
return 0;
default:
return 0;
}
}
/* SU= 40 */
/* Decrypt using selected mode of operation */
unsign32 core::AES_decrypt(core::aes *a, char *buff)
{
int j, bytes;
char st[16];
unsign32 fell_off;
/* Supported modes of operation */
fell_off = 0;
switch (a->mode)
{
case ECB:
AES_ecb_decrypt(a, (uchar *)buff);
return 0;
case CBC:
for (j = 0; j < 4 * NB; j++)
{
st[j] = a->f[j];
a->f[j] = buff[j];
}
AES_ecb_decrypt(a, (uchar *)buff);
for (j = 0; j < 4 * NB; j++)
{
buff[j] ^= st[j];
st[j] = 0;
}
return 0;
case CFB1:
case CFB2:
case CFB4:
bytes = a->mode - CFB1 + 1;
for (j = 0; j < bytes; j++) fell_off = (fell_off << 8) | a->f[j];
for (j = 0; j < 4 * NB; j++) st[j] = a->f[j];
for (j = bytes; j < 4 * NB; j++) a->f[j - bytes] = a->f[j];
AES_ecb_encrypt(a, (uchar *)st);
for (j = 0; j < bytes; j++)
{
a->f[16 - bytes + j] = buff[j];
buff[j] ^= st[j];
}
return fell_off;
case OFB1:
case OFB2:
case OFB4:
case OFB8:
case OFB16:
bytes = a->mode - OFB1 + 1;
AES_ecb_encrypt(a, (uchar *)(a->f));
for (j = 0; j < bytes; j++) buff[j] ^= a->f[j];
return 0;
case CTR1:
case CTR2:
case CTR4:
case CTR8:
case CTR16:
bytes = a->mode - CTR1 + 1;
for (j = 0; j < 4 * NB; j++) st[j] = a->f[j];
AES_ecb_encrypt(a, (uchar *)st);
for (j = 0; j < bytes; j++) buff[j] ^= st[j];
increment(a->f);
return 0;
default:
return 0;
}
}
/* Clean up and delete left-overs */
void core::AES_end(core::aes *a)
{
/* clean up */
int i;
for (i = 0; i < NB * (a->Nr + 1); i++)
a->fkey[i] = a->rkey[i] = 0;
for (i = 0; i < 4 * NB; i++)
a->f[i] = 0;
}
/* AES encryption/decryption. Encrypt byte array M using key K and returns ciphertext */
void core::AES_CBC_IV0_ENCRYPT(octet *k, octet *m, octet *c)
{
/* AES CBC encryption, with Null IV and key k */
/* Input is from an octet string m, output is to an octet string c */
/* Input is padded as necessary to make up a full final block */
aes a;
int fin;
int i, j, ipt, opt;
char buff[16];
int padlen;
OCT_clear(c);
if (m->len == 0) return;
AES_init(&a, CBC, k->len, k->val, NULL);
ipt = opt = 0;
fin = 0;
for (;;)
{
for (i = 0; i < 16; i++)
{
if (ipt < m->len) buff[i] = m->val[ipt++];
else
{
fin = 1;
break;
}
}
if (fin) break;
AES_encrypt(&a, buff);
for (i = 0; i < 16; i++)
if (opt < c->max) c->val[opt++] = buff[i];
}
/* last block, filled up to i-th index */
padlen = 16 - i;
for (j = i; j < 16; j++) buff[j] = padlen;
AES_encrypt(&a, buff);
for (i = 0; i < 16; i++)
if (opt < c->max) c->val[opt++] = buff[i];
AES_end(&a);
c->len = opt;
}
/* decrypts and returns TRUE if all consistent, else returns FALSE */
int core::AES_CBC_IV0_DECRYPT(octet *k, octet *c, octet *m)
{
/* padding is removed */
aes a;
int i, ipt, opt, ch;
char buff[16];
int fin, bad;
int padlen;
ipt = opt = 0;
OCT_clear(m);
if (c->len == 0) return 1;
ch = c->val[ipt++];
AES_init(&a, CBC, k->len, k->val, NULL);
fin = 0;
for (;;)
{
for (i = 0; i < 16; i++)
{
buff[i] = ch;
if (ipt >= c->len)
{
fin = 1;
break;
}
else ch = c->val[ipt++];
}
AES_decrypt(&a, buff);
if (fin) break;
for (i = 0; i < 16; i++)
if (opt < m->max) m->val[opt++] = buff[i];
}
AES_end(&a);
bad = 0;
padlen = buff[15];
if (i != 15 || padlen < 1 || padlen > 16) bad = 1;
if (padlen >= 2 && padlen <= 16)
for (i = 16 - padlen; i < 16; i++) if (buff[i] != padlen) bad = 1;
if (!bad) for (i = 0; i < 16 - padlen; i++)
if (opt < m->max) m->val[opt++] = buff[i];
m->len = opt;
if (bad) return 0;
return 1;
}
/*
#include <stdio.h>
#define KK 32
int main()
{
int i;
aes a;
unsign32 t;
uchar x,y;
char key[KK];
char block[16];
char iv[16];
for (i=0;i<KK;i++) key[i]=5;
key[0]=1;
for (i=0;i<16;i++) iv[i]=i;
for (i=0;i<16;i++) block[i]=i;
AES_init(&a,CTR16,KK,key,iv);
printf("Plain= ");
for (i=0;i<16;i++) printf("%02x",block[i]);
printf("\n");
AES_encrypt(&a,block);
printf("Encrypt= ");
for (i=0;i<16;i++) printf("%02x",(uchar)block[i]);
printf("\n");
AES_reset(&a,CTR16,iv);
AES_decrypt(&a,block);
printf("Decrypt= ");
for (i=0;i<16;i++) printf("%02x",(uchar)block[i]);
printf("\n");
AES_end(&a);
return 0;
}
*/
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