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wolfSSL SSL/TLS library, support up to TLS1.3

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wolfcrypt/src/idea.c@11:cee25a834751, 2017-05-30 (annotated)

Committer:
wolfSSL
Date:
Tue May 30 01:44:10 2017 +0000
Revision:
11:cee25a834751
wolfSSL 3.11.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wolfSSL 11:cee25a834751 1 /* idea.c
wolfSSL 11:cee25a834751 2 *
wolfSSL 11:cee25a834751 3 * Copyright (C) 2006-2016 wolfSSL Inc.
wolfSSL 11:cee25a834751 4 *
wolfSSL 11:cee25a834751 5 * This file is part of wolfSSL.
wolfSSL 11:cee25a834751 6 *
wolfSSL 11:cee25a834751 7 * wolfSSL is free software; you can redistribute it and/or modify
wolfSSL 11:cee25a834751 8 * it under the terms of the GNU General Public License as published by
wolfSSL 11:cee25a834751 9 * the Free Software Foundation; either version 2 of the License, or
wolfSSL 11:cee25a834751 10 * (at your option) any later version.
wolfSSL 11:cee25a834751 11 *
wolfSSL 11:cee25a834751 12 * wolfSSL is distributed in the hope that it will be useful,
wolfSSL 11:cee25a834751 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
wolfSSL 11:cee25a834751 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
wolfSSL 11:cee25a834751 15 * GNU General Public License for more details.
wolfSSL 11:cee25a834751 16 *
wolfSSL 11:cee25a834751 17 * You should have received a copy of the GNU General Public License
wolfSSL 11:cee25a834751 18 * along with this program; if not, write to the Free Software
wolfSSL 11:cee25a834751 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
wolfSSL 11:cee25a834751 20 */
wolfSSL 11:cee25a834751 21
wolfSSL 11:cee25a834751 22
wolfSSL 11:cee25a834751 23 #ifdef HAVE_CONFIG_H
wolfSSL 11:cee25a834751 24 #include <config.h>
wolfSSL 11:cee25a834751 25 #endif
wolfSSL 11:cee25a834751 26
wolfSSL 11:cee25a834751 27 #include <wolfssl/wolfcrypt/settings.h>
wolfSSL 11:cee25a834751 28
wolfSSL 11:cee25a834751 29 #ifdef HAVE_IDEA
wolfSSL 11:cee25a834751 30
wolfSSL 11:cee25a834751 31 #include <wolfssl/wolfcrypt/idea.h>
wolfSSL 11:cee25a834751 32
wolfSSL 11:cee25a834751 33 #include <wolfssl/wolfcrypt/error-crypt.h>
wolfSSL 11:cee25a834751 34 #include <wolfssl/wolfcrypt/logging.h>
wolfSSL 11:cee25a834751 35
wolfSSL 11:cee25a834751 36 #ifdef NO_INLINE
wolfSSL 11:cee25a834751 37 #include <wolfssl/wolfcrypt/misc.h>
wolfSSL 11:cee25a834751 38 #else
wolfSSL 11:cee25a834751 39 #define WOLFSSL_MISC_INCLUDED
wolfSSL 11:cee25a834751 40 #include <wolfcrypt/src/misc.c>
wolfSSL 11:cee25a834751 41 #endif
wolfSSL 11:cee25a834751 42
wolfSSL 11:cee25a834751 43 /* multiplication of x and y modulo 2^16+1
wolfSSL 11:cee25a834751 44 * IDEA specify a special case when an entry value is 0 ( x or y)
wolfSSL 11:cee25a834751 45 * then it must be replaced by 2^16
wolfSSL 11:cee25a834751 46 */
wolfSSL 11:cee25a834751 47 static INLINE word16 idea_mult(word16 x, word16 y)
wolfSSL 11:cee25a834751 48 {
wolfSSL 11:cee25a834751 49 long mul, res;
wolfSSL 11:cee25a834751 50
wolfSSL 11:cee25a834751 51 mul = (long)x * (long)y;
wolfSSL 11:cee25a834751 52 if (mul) {
wolfSSL 11:cee25a834751 53 res = (mul & IDEA_MASK) - ((word32)mul >> 16);
wolfSSL 11:cee25a834751 54 if (res <= 0)
wolfSSL 11:cee25a834751 55 res += IDEA_MODULO;
wolfSSL 11:cee25a834751 56
wolfSSL 11:cee25a834751 57 return (word16) (res & IDEA_MASK);
wolfSSL 11:cee25a834751 58 }
wolfSSL 11:cee25a834751 59
wolfSSL 11:cee25a834751 60 if (!x)
wolfSSL 11:cee25a834751 61 return ((IDEA_MODULO - y) & IDEA_MASK);
wolfSSL 11:cee25a834751 62
wolfSSL 11:cee25a834751 63 /* !y */
wolfSSL 11:cee25a834751 64 return ((IDEA_MODULO - x) & IDEA_MASK);
wolfSSL 11:cee25a834751 65 }
wolfSSL 11:cee25a834751 66
wolfSSL 11:cee25a834751 67 /* compute 1/a modulo 2^16+1 using Extended euclidean algorithm
wolfSSL 11:cee25a834751 68 * adapted from fp_invmod */
wolfSSL 11:cee25a834751 69 static INLINE word16 idea_invmod(word16 x)
wolfSSL 11:cee25a834751 70 {
wolfSSL 11:cee25a834751 71 int u, v, b, d;
wolfSSL 11:cee25a834751 72
wolfSSL 11:cee25a834751 73 if (x <= 1)
wolfSSL 11:cee25a834751 74 return x;
wolfSSL 11:cee25a834751 75
wolfSSL 11:cee25a834751 76 u = IDEA_MODULO;
wolfSSL 11:cee25a834751 77 v = x;
wolfSSL 11:cee25a834751 78 d = 1;
wolfSSL 11:cee25a834751 79 b = 0;
wolfSSL 11:cee25a834751 80
wolfSSL 11:cee25a834751 81 do {
wolfSSL 11:cee25a834751 82 while (!(u & 1)) {
wolfSSL 11:cee25a834751 83 u >>= 1;
wolfSSL 11:cee25a834751 84 if (b & 1)
wolfSSL 11:cee25a834751 85 b -= IDEA_MODULO;
wolfSSL 11:cee25a834751 86 b >>= 1;
wolfSSL 11:cee25a834751 87 }
wolfSSL 11:cee25a834751 88
wolfSSL 11:cee25a834751 89 while (!(v & 1)) {
wolfSSL 11:cee25a834751 90 v >>= 1;
wolfSSL 11:cee25a834751 91 if (d & 1) {
wolfSSL 11:cee25a834751 92 d -= IDEA_MODULO;
wolfSSL 11:cee25a834751 93 }
wolfSSL 11:cee25a834751 94 d >>= 1;
wolfSSL 11:cee25a834751 95 }
wolfSSL 11:cee25a834751 96
wolfSSL 11:cee25a834751 97 if (u >= v) {
wolfSSL 11:cee25a834751 98 u -= v;
wolfSSL 11:cee25a834751 99 b -= d;
wolfSSL 11:cee25a834751 100 } else {
wolfSSL 11:cee25a834751 101 v -= u;
wolfSSL 11:cee25a834751 102 d -= b;
wolfSSL 11:cee25a834751 103 }
wolfSSL 11:cee25a834751 104 } while (u != 0);
wolfSSL 11:cee25a834751 105
wolfSSL 11:cee25a834751 106 /* d is now the inverse, put positive value if required */
wolfSSL 11:cee25a834751 107 while (d < 0)
wolfSSL 11:cee25a834751 108 d += IDEA_MODULO;
wolfSSL 11:cee25a834751 109
wolfSSL 11:cee25a834751 110 /* d must be < IDEA_MODULO */
wolfSSL 11:cee25a834751 111 while (d >= (int)IDEA_MODULO)
wolfSSL 11:cee25a834751 112 d -= IDEA_MODULO;
wolfSSL 11:cee25a834751 113
wolfSSL 11:cee25a834751 114 return (word16)(d & IDEA_MASK);
wolfSSL 11:cee25a834751 115 }
wolfSSL 11:cee25a834751 116
wolfSSL 11:cee25a834751 117 /* generate the 52 16-bits key sub-blocks from the 128 key */
wolfSSL 11:cee25a834751 118 int wc_IdeaSetKey(Idea *idea, const byte* key, word16 keySz,
wolfSSL 11:cee25a834751 119 const byte *iv, int dir)
wolfSSL 11:cee25a834751 120 {
wolfSSL 11:cee25a834751 121 word16 idx = 0;
wolfSSL 11:cee25a834751 122 word32 t;
wolfSSL 11:cee25a834751 123 short i;
wolfSSL 11:cee25a834751 124
wolfSSL 11:cee25a834751 125 if (idea == NULL || key == NULL || keySz != IDEA_KEY_SIZE ||
wolfSSL 11:cee25a834751 126 (dir != IDEA_ENCRYPTION && dir != IDEA_DECRYPTION))
wolfSSL 11:cee25a834751 127 return BAD_FUNC_ARG;
wolfSSL 11:cee25a834751 128
wolfSSL 11:cee25a834751 129 /* initial key schedule for 0 -> 7 */
wolfSSL 11:cee25a834751 130 for (i = 0; i < IDEA_ROUNDS; i++) {
wolfSSL 11:cee25a834751 131 idea->skey[i] = (word16)key[idx++] << 8;
wolfSSL 11:cee25a834751 132 idea->skey[i] |= (word16)key[idx++];
wolfSSL 11:cee25a834751 133 }
wolfSSL 11:cee25a834751 134
wolfSSL 11:cee25a834751 135 /* shift phase key schedule for 8 -> 51 */
wolfSSL 11:cee25a834751 136 for (i = IDEA_ROUNDS; i < IDEA_SK_NUM; i++) {
wolfSSL 11:cee25a834751 137 t = (word32)idea->skey[((i+1) & 7) ? i-7 : i-15] << 9;
wolfSSL 11:cee25a834751 138 t |= (word32)idea->skey[((i+2) & 7) < 2 ? i-14 : i-6] >> 7;
wolfSSL 11:cee25a834751 139 idea->skey[i] = (word16)(t & IDEA_MASK);
wolfSSL 11:cee25a834751 140 }
wolfSSL 11:cee25a834751 141
wolfSSL 11:cee25a834751 142 /* compute decryption key from encryption key */
wolfSSL 11:cee25a834751 143 if (dir == IDEA_DECRYPTION) {
wolfSSL 11:cee25a834751 144 word16 enckey[IDEA_SK_NUM];
wolfSSL 11:cee25a834751 145
wolfSSL 11:cee25a834751 146 /* put encryption key in tmp buffer */
wolfSSL 11:cee25a834751 147 XMEMCPY(enckey, idea->skey, sizeof(idea->skey));
wolfSSL 11:cee25a834751 148
wolfSSL 11:cee25a834751 149 idx = 0;
wolfSSL 11:cee25a834751 150
wolfSSL 11:cee25a834751 151 idea->skey[6*IDEA_ROUNDS] = idea_invmod(enckey[idx++]);
wolfSSL 11:cee25a834751 152 idea->skey[6*IDEA_ROUNDS+1] = (IDEA_2EXP16 - enckey[idx++]) & IDEA_MASK;
wolfSSL 11:cee25a834751 153 idea->skey[6*IDEA_ROUNDS+2] = (IDEA_2EXP16 - enckey[idx++]) & IDEA_MASK;
wolfSSL 11:cee25a834751 154 idea->skey[6*IDEA_ROUNDS+3] = idea_invmod(enckey[idx++]);
wolfSSL 11:cee25a834751 155
wolfSSL 11:cee25a834751 156 for (i = 6*(IDEA_ROUNDS-1); i >= 0; i -= 6) {
wolfSSL 11:cee25a834751 157 idea->skey[i+4] = enckey[idx++];
wolfSSL 11:cee25a834751 158 idea->skey[i+5] = enckey[idx++];
wolfSSL 11:cee25a834751 159
wolfSSL 11:cee25a834751 160 idea->skey[i] = idea_invmod(enckey[idx++]);
wolfSSL 11:cee25a834751 161 if (i) {
wolfSSL 11:cee25a834751 162 idea->skey[i+2] = (IDEA_2EXP16 - enckey[idx++]) & IDEA_MASK;
wolfSSL 11:cee25a834751 163 idea->skey[i+1] = (IDEA_2EXP16 - enckey[idx++]) & IDEA_MASK;
wolfSSL 11:cee25a834751 164 }
wolfSSL 11:cee25a834751 165 else {
wolfSSL 11:cee25a834751 166 idea->skey[1] = (IDEA_2EXP16 - enckey[idx++]) & IDEA_MASK;
wolfSSL 11:cee25a834751 167 idea->skey[2] = (IDEA_2EXP16 - enckey[idx++]) & IDEA_MASK;
wolfSSL 11:cee25a834751 168 }
wolfSSL 11:cee25a834751 169
wolfSSL 11:cee25a834751 170 idea->skey[i+3] = idea_invmod(enckey[idx++]);
wolfSSL 11:cee25a834751 171 }
wolfSSL 11:cee25a834751 172
wolfSSL 11:cee25a834751 173 /* erase temporary buffer */
wolfSSL 11:cee25a834751 174 ForceZero(enckey, sizeof(enckey));
wolfSSL 11:cee25a834751 175 }
wolfSSL 11:cee25a834751 176
wolfSSL 11:cee25a834751 177 /* set the iv */
wolfSSL 11:cee25a834751 178 return wc_IdeaSetIV(idea, iv);
wolfSSL 11:cee25a834751 179 }
wolfSSL 11:cee25a834751 180
wolfSSL 11:cee25a834751 181 /* set the IV in the Idea key structure */
wolfSSL 11:cee25a834751 182 int wc_IdeaSetIV(Idea *idea, const byte* iv)
wolfSSL 11:cee25a834751 183 {
wolfSSL 11:cee25a834751 184 if (idea == NULL)
wolfSSL 11:cee25a834751 185 return BAD_FUNC_ARG;
wolfSSL 11:cee25a834751 186
wolfSSL 11:cee25a834751 187 if (iv != NULL)
wolfSSL 11:cee25a834751 188 XMEMCPY(idea->reg, iv, IDEA_BLOCK_SIZE);
wolfSSL 11:cee25a834751 189 else
wolfSSL 11:cee25a834751 190 XMEMSET(idea->reg, 0, IDEA_BLOCK_SIZE);
wolfSSL 11:cee25a834751 191
wolfSSL 11:cee25a834751 192 return 0;
wolfSSL 11:cee25a834751 193 }
wolfSSL 11:cee25a834751 194
wolfSSL 11:cee25a834751 195 /* encryption/decryption for a block (64 bits)
wolfSSL 11:cee25a834751 196 */
wolfSSL 11:cee25a834751 197 void wc_IdeaCipher(Idea *idea, byte* out, const byte* in)
wolfSSL 11:cee25a834751 198 {
wolfSSL 11:cee25a834751 199 word32 t1, t2;
wolfSSL 11:cee25a834751 200 word16 i, skey_idx = 0, idx = 0;
wolfSSL 11:cee25a834751 201 word16 x[4];
wolfSSL 11:cee25a834751 202
wolfSSL 11:cee25a834751 203 /* put input byte block in word16 */
wolfSSL 11:cee25a834751 204 for (i = 0; i < IDEA_BLOCK_SIZE/2; i++) {
wolfSSL 11:cee25a834751 205 x[i] = (word16)in[idx++] << 8;
wolfSSL 11:cee25a834751 206 x[i] |= (word16)in[idx++];
wolfSSL 11:cee25a834751 207 }
wolfSSL 11:cee25a834751 208
wolfSSL 11:cee25a834751 209 for (i = 0; i < IDEA_ROUNDS; i++) {
wolfSSL 11:cee25a834751 210 x[0] = idea_mult(x[0], idea->skey[skey_idx++]);
wolfSSL 11:cee25a834751 211 x[1] = ((word32)x[1] + (word32)idea->skey[skey_idx++]) & IDEA_MASK;
wolfSSL 11:cee25a834751 212 x[2] = ((word32)x[2] + (word32)idea->skey[skey_idx++]) & IDEA_MASK;
wolfSSL 11:cee25a834751 213 x[3] = idea_mult(x[3], idea->skey[skey_idx++]);
wolfSSL 11:cee25a834751 214
wolfSSL 11:cee25a834751 215 t2 = x[0] ^ x[2];
wolfSSL 11:cee25a834751 216 t2 = idea_mult((word16)t2, idea->skey[skey_idx++]);
wolfSSL 11:cee25a834751 217 t1 = (t2 + (x[1] ^ x[3])) & IDEA_MASK;
wolfSSL 11:cee25a834751 218 t1 = idea_mult((word16)t1, idea->skey[skey_idx++]);
wolfSSL 11:cee25a834751 219 t2 = (t1 + t2) & IDEA_MASK;
wolfSSL 11:cee25a834751 220
wolfSSL 11:cee25a834751 221 x[0] ^= t1;
wolfSSL 11:cee25a834751 222 x[3] ^= t2;
wolfSSL 11:cee25a834751 223
wolfSSL 11:cee25a834751 224 t2 ^= x[1];
wolfSSL 11:cee25a834751 225 x[1] = x[2] ^ (word16)t1;
wolfSSL 11:cee25a834751 226 x[2] = (word16)t2;
wolfSSL 11:cee25a834751 227 }
wolfSSL 11:cee25a834751 228
wolfSSL 11:cee25a834751 229 x[0] = idea_mult(x[0], idea->skey[skey_idx++]);
wolfSSL 11:cee25a834751 230 out[0] = (x[0] >> 8) & 0xFF;
wolfSSL 11:cee25a834751 231 out[1] = x[0] & 0xFF;
wolfSSL 11:cee25a834751 232
wolfSSL 11:cee25a834751 233 x[2] = ((word32)x[2] + (word32)idea->skey[skey_idx++]) & IDEA_MASK;
wolfSSL 11:cee25a834751 234 out[2] = (x[2] >> 8) & 0xFF;
wolfSSL 11:cee25a834751 235 out[3] = x[2] & 0xFF;
wolfSSL 11:cee25a834751 236
wolfSSL 11:cee25a834751 237 x[1] = ((word32)x[1] + (word32)idea->skey[skey_idx++]) & IDEA_MASK;
wolfSSL 11:cee25a834751 238 out[4] = (x[1] >> 8) & 0xFF;
wolfSSL 11:cee25a834751 239 out[5] = x[1] & 0xFF;
wolfSSL 11:cee25a834751 240
wolfSSL 11:cee25a834751 241 x[3] = idea_mult(x[3], idea->skey[skey_idx++]);
wolfSSL 11:cee25a834751 242 out[6] = (x[3] >> 8) & 0xFF;
wolfSSL 11:cee25a834751 243 out[7] = x[3] & 0xFF;
wolfSSL 11:cee25a834751 244 }
wolfSSL 11:cee25a834751 245
wolfSSL 11:cee25a834751 246 int wc_IdeaCbcEncrypt(Idea *idea, byte* out, const byte* in, word32 len)
wolfSSL 11:cee25a834751 247 {
wolfSSL 11:cee25a834751 248 int blocks;
wolfSSL 11:cee25a834751 249
wolfSSL 11:cee25a834751 250 if (idea == NULL || out == NULL || in == NULL)
wolfSSL 11:cee25a834751 251 return BAD_FUNC_ARG;
wolfSSL 11:cee25a834751 252
wolfSSL 11:cee25a834751 253 blocks = len / IDEA_BLOCK_SIZE;
wolfSSL 11:cee25a834751 254 while (blocks--) {
wolfSSL 11:cee25a834751 255 xorbuf((byte*)idea->reg, in, IDEA_BLOCK_SIZE);
wolfSSL 11:cee25a834751 256 wc_IdeaCipher(idea, (byte*)idea->reg, (byte*)idea->reg);
wolfSSL 11:cee25a834751 257 XMEMCPY(out, idea->reg, IDEA_BLOCK_SIZE);
wolfSSL 11:cee25a834751 258
wolfSSL 11:cee25a834751 259 out += IDEA_BLOCK_SIZE;
wolfSSL 11:cee25a834751 260 in += IDEA_BLOCK_SIZE;
wolfSSL 11:cee25a834751 261 }
wolfSSL 11:cee25a834751 262
wolfSSL 11:cee25a834751 263 return 0;
wolfSSL 11:cee25a834751 264 }
wolfSSL 11:cee25a834751 265
wolfSSL 11:cee25a834751 266 int wc_IdeaCbcDecrypt(Idea *idea, byte* out, const byte* in, word32 len)
wolfSSL 11:cee25a834751 267 {
wolfSSL 11:cee25a834751 268 int blocks;
wolfSSL 11:cee25a834751 269
wolfSSL 11:cee25a834751 270 if (idea == NULL || out == NULL || in == NULL)
wolfSSL 11:cee25a834751 271 return BAD_FUNC_ARG;
wolfSSL 11:cee25a834751 272
wolfSSL 11:cee25a834751 273 blocks = len / IDEA_BLOCK_SIZE;
wolfSSL 11:cee25a834751 274 while (blocks--) {
wolfSSL 11:cee25a834751 275 XMEMCPY((byte*)idea->tmp, in, IDEA_BLOCK_SIZE);
wolfSSL 11:cee25a834751 276 wc_IdeaCipher(idea, out, (byte*)idea->tmp);
wolfSSL 11:cee25a834751 277 xorbuf(out, (byte*)idea->reg, IDEA_BLOCK_SIZE);
wolfSSL 11:cee25a834751 278 XMEMCPY(idea->reg, idea->tmp, IDEA_BLOCK_SIZE);
wolfSSL 11:cee25a834751 279
wolfSSL 11:cee25a834751 280 out += IDEA_BLOCK_SIZE;
wolfSSL 11:cee25a834751 281 in += IDEA_BLOCK_SIZE;
wolfSSL 11:cee25a834751 282 }
wolfSSL 11:cee25a834751 283
wolfSSL 11:cee25a834751 284 return 0;
wolfSSL 11:cee25a834751 285 }
wolfSSL 11:cee25a834751 286
wolfSSL 11:cee25a834751 287 #endif /* HAVE_IDEA */
wolfSSL 11:cee25a834751 288