| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: noekeon.c,v 1.2 2001/06/16 23:42:17 mdw Exp $ |
| 4 | * |
| 5 | * The Noekeon block cipher |
| 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 | /*----- Revision history --------------------------------------------------* |
| 31 | * |
| 32 | * $Log: noekeon.c,v $ |
| 33 | * Revision 1.2 2001/06/16 23:42:17 mdw |
| 34 | * Typesetting fixes. |
| 35 | * |
| 36 | * Revision 1.1 2001/05/08 22:17:41 mdw |
| 37 | * New cipher Noekeon added. |
| 38 | * |
| 39 | */ |
| 40 | |
| 41 | /*----- Header files ------------------------------------------------------*/ |
| 42 | |
| 43 | #include <assert.h> |
| 44 | #include <stdio.h> |
| 45 | |
| 46 | #include <mLib/bits.h> |
| 47 | |
| 48 | #include "blkc.h" |
| 49 | #include "gcipher.h" |
| 50 | #include "noekeon.h" |
| 51 | |
| 52 | /*----- Global variables --------------------------------------------------*/ |
| 53 | |
| 54 | const octet noekeon_keysz[] = { KSZ_SET, NOEKEON_KEYSZ, 0 }; |
| 55 | |
| 56 | /*----- Magic constants ---------------------------------------------------*/ |
| 57 | |
| 58 | /* --- To generate the magic --- * |
| 59 | * |
| 60 | * perl -e'@@r=();$x=0x80;for(0..16){push(@@r,$x);$x<<=1;$x^=0x11b |
| 61 | * if$x&0x100;};print join(", ",map{sprintf"0x%02x",$_}@@r),"\n";' |
| 62 | */ |
| 63 | |
| 64 | static const octet rcon[17] = { |
| 65 | 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, |
| 66 | 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, |
| 67 | 0xd4 |
| 68 | }; |
| 69 | |
| 70 | /*----- Main code ---------------------------------------------------------*/ |
| 71 | |
| 72 | /* --- @noekeon_init@--- * |
| 73 | * |
| 74 | * Arguments: @noekeon_ctx *k@ = pointer to key block to fill in |
| 75 | * @const void *buf@ = pointer to buffer of key material |
| 76 | * @size_t sz@ = size of key material |
| 77 | * |
| 78 | * Returns: --- |
| 79 | * |
| 80 | * Use: Initializes a Noekeon key buffer. Noekeon accepts a 128-bit |
| 81 | * key. |
| 82 | */ |
| 83 | |
| 84 | void noekeon_init(noekeon_ctx *k, const void *buf, size_t sz) |
| 85 | { |
| 86 | const octet *p = buf; |
| 87 | static const noekeon_ctx nullkey = { { 0, 0, 0, 0 } }; |
| 88 | |
| 89 | KSZ_ASSERT(noekeon, sz); |
| 90 | k->k[0] = LOAD32(p + 0); |
| 91 | k->k[1] = LOAD32(p + 4); |
| 92 | k->k[2] = LOAD32(p + 8); |
| 93 | k->k[3] = LOAD32(p + 12); |
| 94 | noekeon_eblk(&nullkey, k->k, k->k); |
| 95 | } |
| 96 | |
| 97 | /* --- @noekeon_eblk@, @noekeon_dblk@ --- * |
| 98 | * |
| 99 | * Arguments: @const noekeon_ctx *k@ = pointer to key block |
| 100 | * @const uint32 s[2]@ = pointer to source block |
| 101 | * @uint32 d[2]@ = pointer to destination block |
| 102 | * |
| 103 | * Returns: --- |
| 104 | * |
| 105 | * Use: Low-level block encryption and decryption. |
| 106 | */ |
| 107 | |
| 108 | #define GAMMA(a, b, c, d) do { \ |
| 109 | uint32 _x; \ |
| 110 | b ^= ~(c | d); a ^= b & c; \ |
| 111 | _x = d; d = a; a = _x; \ |
| 112 | c ^= a ^ b ^ d; \ |
| 113 | b ^= ~(c | d); a ^= b & c; \ |
| 114 | } while (0) |
| 115 | |
| 116 | #define THETA(ka, kb, kc, kd, a, b, c, d) do { \ |
| 117 | uint32 _x; \ |
| 118 | _x = a ^ c; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); b ^= _x; d ^= _x; \ |
| 119 | a ^= ka; b ^= kb; c ^= kc; d ^= kd; \ |
| 120 | _x = b ^ d; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); a ^= _x; c ^= _x; \ |
| 121 | } while (0) |
| 122 | |
| 123 | #define ITHETA(ka, kb, kc, kd, a, b, c, d) do { \ |
| 124 | uint32 _x; \ |
| 125 | _x = b ^ d; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); a ^= _x; c ^= _x; \ |
| 126 | a ^= ka; b ^= kb; c ^= kc; d ^= kd; \ |
| 127 | _x = a ^ c; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); b ^= _x; d ^= _x; \ |
| 128 | } while (0) |
| 129 | |
| 130 | #define PI1(a, b, c, d) do { \ |
| 131 | b = ROL32(b, 1); c = ROL32(c, 5); d = ROL32(d, 2); \ |
| 132 | } while (0) |
| 133 | |
| 134 | #define PI2(a, b, c, d) do { \ |
| 135 | b = ROR32(b, 1); c = ROR32(c, 5); d = ROR32(d, 2); \ |
| 136 | } while (0) |
| 137 | |
| 138 | #define ROUND(r, ka, kb, kc, kd, a, b, c, d) do { \ |
| 139 | a ^= *r++; THETA(ka, kb, kc, kd, a, b, c, d); \ |
| 140 | PI1(a, b, c, d); GAMMA(a, b, c, d); PI2(a, b, c, d); \ |
| 141 | } while (0) |
| 142 | |
| 143 | #define IROUND(r, ka, kb, kc, kd, a, b, c, d) do { \ |
| 144 | ITHETA(ka, kb, kc, kd, a, b, c, d); a ^= *--r; \ |
| 145 | PI1(a, b, c, d); GAMMA(a, b, c, d); PI2(a, b, c, d); \ |
| 146 | } while (0) |
| 147 | |
| 148 | void noekeon_eblk(const noekeon_ctx *k, const uint32 *src, uint32 *dst) |
| 149 | { |
| 150 | uint32 ka = k->k[0], kb = k->k[1], kc = k->k[2], kd = k->k[3]; |
| 151 | uint32 a = src[0], b = src[1], c = src[2], d = src[3]; |
| 152 | const octet *r = rcon; |
| 153 | |
| 154 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 155 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 156 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 157 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 158 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 159 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 160 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 161 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 162 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 163 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 164 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 165 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 166 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 167 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 168 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 169 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 170 | |
| 171 | a ^= *r++; THETA(ka, kb, kc, kd, a, b, c, d); |
| 172 | |
| 173 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; |
| 174 | } |
| 175 | |
| 176 | void noekeon_dblk(const noekeon_ctx *k, const uint32 *src, uint32 *dst) |
| 177 | { |
| 178 | uint32 ka = k->k[0], kb = k->k[1], kc = k->k[2], kd = k->k[3]; |
| 179 | uint32 a = src[0], b = src[1], c = src[2], d = src[3]; |
| 180 | const octet *r = rcon + sizeof(rcon); |
| 181 | |
| 182 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 183 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 184 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 185 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 186 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 187 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 188 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 189 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 190 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 191 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 192 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 193 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 194 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 195 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 196 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 197 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
| 198 | |
| 199 | ITHETA(ka, kb, kc, kd, a, b, c, d); a ^= *--r; |
| 200 | |
| 201 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; |
| 202 | } |
| 203 | |
| 204 | BLKC_TEST(NOEKEON, noekeon) |
| 205 | |
| 206 | /*----- That's all, folks -------------------------------------------------*/ |