| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: rijndael256.c,v 1.2 2004/04/08 01:36:15 mdw Exp $ |
| 4 | * |
| 5 | * The Rijndael block cipher, 256-bit version |
| 6 | * |
| 7 | * (c) 2001 Straylight/Edgeware |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of Catacomb. |
| 13 | * |
| 14 | * Catacomb is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU Library General Public License as |
| 16 | * published by the Free Software Foundation; either version 2 of the |
| 17 | * License, or (at your option) any later version. |
| 18 | * |
| 19 | * Catacomb is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU Library General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU Library General Public |
| 25 | * License along with Catacomb; if not, write to the Free |
| 26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 27 | * MA 02111-1307, USA. |
| 28 | */ |
| 29 | |
| 30 | /*----- Header files ------------------------------------------------------*/ |
| 31 | |
| 32 | #include <assert.h> |
| 33 | #include <stdio.h> |
| 34 | |
| 35 | #include <mLib/bits.h> |
| 36 | |
| 37 | #include "blkc.h" |
| 38 | #include "gcipher.h" |
| 39 | #include "rijndael.h" |
| 40 | #include "rijndael256.h" |
| 41 | #include "rijndael-base.h" |
| 42 | |
| 43 | /*----- Main code ---------------------------------------------------------*/ |
| 44 | |
| 45 | /* --- @rijndael256_init@ --- * |
| 46 | * |
| 47 | * Arguments: @rijndael_ctx *k@ = pointer to context to initialize |
| 48 | * @const void *buf@ = pointer to buffer of key material |
| 49 | * @size_t sz@ = size of the key material |
| 50 | * |
| 51 | * Returns: --- |
| 52 | * |
| 53 | * Use: Initializes a Rijndael context with a particular key. This |
| 54 | * implementation of Rijndael doesn't impose any particular |
| 55 | * limits on the key size except that it must be multiple of 4 |
| 56 | * bytes long. 256 bits seems sensible, though. |
| 57 | */ |
| 58 | |
| 59 | void rijndael256_init(rijndael_ctx *k, const void *buf, size_t sz) |
| 60 | { |
| 61 | rijndael_setup(k, RIJNDAEL256_BLKSZ / 4, buf, sz); |
| 62 | } |
| 63 | |
| 64 | /* --- @rijndael256_eblk@, @rijndael256_dblk@ --- * |
| 65 | * |
| 66 | * Arguments: @const rijndael_ctx *k@ = pointer to Rijndael context |
| 67 | * @const uint32 s[4]@ = pointer to source block |
| 68 | * @uint32 d[4]@ = pointer to destination block |
| 69 | * |
| 70 | * Returns: --- |
| 71 | * |
| 72 | * Use: Low-level block encryption and decryption. |
| 73 | */ |
| 74 | |
| 75 | #define DO(what, t, \ |
| 76 | aa, bb, cc, dd, ee, ff, gg, hh, \ |
| 77 | a, b, c, d, e, f, g, h, w) do { \ |
| 78 | aa = what(t, a, b, d, e) ^ *w++; \ |
| 79 | bb = what(t, b, c, e, f) ^ *w++; \ |
| 80 | cc = what(t, c, d, f, g) ^ *w++; \ |
| 81 | dd = what(t, d, e, g, h) ^ *w++; \ |
| 82 | ee = what(t, e, f, h, a) ^ *w++; \ |
| 83 | ff = what(t, f, g, a, b) ^ *w++; \ |
| 84 | gg = what(t, g, h, b, c) ^ *w++; \ |
| 85 | hh = what(t, h, a, c, d) ^ *w++; \ |
| 86 | } while (0) |
| 87 | |
| 88 | #define UNDO(what, t, \ |
| 89 | aa, bb, cc, dd, ee, ff, gg, hh, \ |
| 90 | a, b, c, d, e, f, g, h, w) do { \ |
| 91 | aa = what(t, a, h, f, e) ^ *w++; \ |
| 92 | bb = what(t, b, a, g, f) ^ *w++; \ |
| 93 | cc = what(t, c, b, h, g) ^ *w++; \ |
| 94 | dd = what(t, d, c, a, h) ^ *w++; \ |
| 95 | ee = what(t, e, d, b, a) ^ *w++; \ |
| 96 | ff = what(t, f, e, c, b) ^ *w++; \ |
| 97 | gg = what(t, g, f, d, c) ^ *w++; \ |
| 98 | hh = what(t, h, g, e, d) ^ *w++; \ |
| 99 | } while (0) |
| 100 | |
| 101 | void rijndael256_eblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst) |
| 102 | { |
| 103 | uint32 a = s[0], b = s[1], c = s[2], d = s[3]; |
| 104 | uint32 e = s[4], f = s[5], g = s[6], h = s[7]; |
| 105 | uint32 aa, bb, cc, dd, ee, ff, gg, hh; |
| 106 | uint32 *w = k->w; |
| 107 | |
| 108 | a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; |
| 109 | e ^= *w++; f ^= *w++; g ^= *w++; h ^= *w++; |
| 110 | |
| 111 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
| 112 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
| 113 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
| 114 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
| 115 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
| 116 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
| 117 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
| 118 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
| 119 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
| 120 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
| 121 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
| 122 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
| 123 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
| 124 | DO(SUB, S, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
| 125 | |
| 126 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; |
| 127 | dst[4] = e; dst[5] = f; dst[6] = g; dst[7] = h; |
| 128 | } |
| 129 | |
| 130 | void rijndael256_dblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst) |
| 131 | { |
| 132 | uint32 a = s[0], b = s[1], c = s[2], d = s[3]; |
| 133 | uint32 e = s[4], f = s[5], g = s[6], h = s[7]; |
| 134 | uint32 aa, bb, cc, dd, ee, ff, gg, hh; |
| 135 | uint32 *w = k->wi; |
| 136 | |
| 137 | a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; |
| 138 | e ^= *w++; f ^= *w++; g ^= *w++; h ^= *w++; |
| 139 | |
| 140 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
| 141 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
| 142 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
| 143 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
| 144 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
| 145 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
| 146 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
| 147 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
| 148 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
| 149 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
| 150 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
| 151 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
| 152 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
| 153 | UNDO(SUB, SI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
| 154 | |
| 155 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; |
| 156 | dst[4] = e; dst[5] = f; dst[6] = g; dst[7] = h; |
| 157 | } |
| 158 | |
| 159 | BLKC_TEST(RIJNDAEL256, rijndael256) |
| 160 | |
| 161 | /*----- That's all, folks -------------------------------------------------*/ |