[164] | 1 | /* rabbit.c
|
---|
| 2 | *
|
---|
| 3 | * Copyright (C) 2006-2015 wolfSSL Inc.
|
---|
| 4 | *
|
---|
| 5 | * This file is part of wolfSSL. (formerly known as CyaSSL)
|
---|
| 6 | *
|
---|
| 7 | * wolfSSL is free software; you can redistribute it and/or modify
|
---|
| 8 | * it under the terms of the GNU General Public License as published by
|
---|
| 9 | * the Free Software Foundation; either version 2 of the License, or
|
---|
| 10 | * (at your option) any later version.
|
---|
| 11 | *
|
---|
| 12 | * wolfSSL is distributed in the hope that it will be useful,
|
---|
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
---|
| 15 | * GNU General Public License for more details.
|
---|
| 16 | *
|
---|
| 17 | * You should have received a copy of the GNU General Public License
|
---|
| 18 | * along with this program; if not, write to the Free Software
|
---|
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
|
---|
| 20 | */
|
---|
| 21 |
|
---|
| 22 | #ifdef HAVE_CONFIG_H
|
---|
| 23 | #include <config.h>
|
---|
| 24 | #endif
|
---|
| 25 |
|
---|
| 26 | #include <wolfssl/wolfcrypt/settings.h>
|
---|
| 27 |
|
---|
| 28 | #ifndef NO_RABBIT
|
---|
| 29 |
|
---|
| 30 | #include <wolfssl/wolfcrypt/rabbit.h>
|
---|
| 31 | #include <wolfssl/wolfcrypt/error-crypt.h>
|
---|
| 32 | #include <wolfssl/wolfcrypt/logging.h>
|
---|
| 33 | #ifdef NO_INLINE
|
---|
| 34 | #include <wolfssl/wolfcrypt/misc.h>
|
---|
| 35 | #else
|
---|
| 36 | #include <wolfcrypt/src/misc.c>
|
---|
| 37 | #endif
|
---|
| 38 |
|
---|
| 39 |
|
---|
| 40 | #ifdef BIG_ENDIAN_ORDER
|
---|
| 41 | #define LITTLE32(x) ByteReverseWord32(x)
|
---|
| 42 | #else
|
---|
| 43 | #define LITTLE32(x) (x)
|
---|
| 44 | #endif
|
---|
| 45 |
|
---|
| 46 | #define U32V(x) ((word32)(x) & 0xFFFFFFFFU)
|
---|
| 47 |
|
---|
| 48 |
|
---|
| 49 | /* Square a 32-bit unsigned integer to obtain the 64-bit result and return */
|
---|
| 50 | /* the upper 32 bits XOR the lower 32 bits */
|
---|
| 51 | static word32 RABBIT_g_func(word32 x)
|
---|
| 52 | {
|
---|
| 53 | /* Temporary variables */
|
---|
| 54 | word32 a, b, h, l;
|
---|
| 55 |
|
---|
| 56 | /* Construct high and low argument for squaring */
|
---|
| 57 | a = x&0xFFFF;
|
---|
| 58 | b = x>>16;
|
---|
| 59 |
|
---|
| 60 | /* Calculate high and low result of squaring */
|
---|
| 61 | h = (((U32V(a*a)>>17) + U32V(a*b))>>15) + b*b;
|
---|
| 62 | l = x*x;
|
---|
| 63 |
|
---|
| 64 | /* Return high XOR low */
|
---|
| 65 | return U32V(h^l);
|
---|
| 66 | }
|
---|
| 67 |
|
---|
| 68 |
|
---|
| 69 | /* Calculate the next internal state */
|
---|
| 70 | static void RABBIT_next_state(RabbitCtx* ctx)
|
---|
| 71 | {
|
---|
| 72 | /* Temporary variables */
|
---|
| 73 | word32 g[8], c_old[8], i;
|
---|
| 74 |
|
---|
| 75 | /* Save old counter values */
|
---|
| 76 | for (i=0; i<8; i++)
|
---|
| 77 | c_old[i] = ctx->c[i];
|
---|
| 78 |
|
---|
| 79 | /* Calculate new counter values */
|
---|
| 80 | ctx->c[0] = U32V(ctx->c[0] + 0x4D34D34D + ctx->carry);
|
---|
| 81 | ctx->c[1] = U32V(ctx->c[1] + 0xD34D34D3 + (ctx->c[0] < c_old[0]));
|
---|
| 82 | ctx->c[2] = U32V(ctx->c[2] + 0x34D34D34 + (ctx->c[1] < c_old[1]));
|
---|
| 83 | ctx->c[3] = U32V(ctx->c[3] + 0x4D34D34D + (ctx->c[2] < c_old[2]));
|
---|
| 84 | ctx->c[4] = U32V(ctx->c[4] + 0xD34D34D3 + (ctx->c[3] < c_old[3]));
|
---|
| 85 | ctx->c[5] = U32V(ctx->c[5] + 0x34D34D34 + (ctx->c[4] < c_old[4]));
|
---|
| 86 | ctx->c[6] = U32V(ctx->c[6] + 0x4D34D34D + (ctx->c[5] < c_old[5]));
|
---|
| 87 | ctx->c[7] = U32V(ctx->c[7] + 0xD34D34D3 + (ctx->c[6] < c_old[6]));
|
---|
| 88 | ctx->carry = (ctx->c[7] < c_old[7]);
|
---|
| 89 |
|
---|
| 90 | /* Calculate the g-values */
|
---|
| 91 | for (i=0;i<8;i++)
|
---|
| 92 | g[i] = RABBIT_g_func(U32V(ctx->x[i] + ctx->c[i]));
|
---|
| 93 |
|
---|
| 94 | /* Calculate new state values */
|
---|
| 95 | ctx->x[0] = U32V(g[0] + rotlFixed(g[7],16) + rotlFixed(g[6], 16));
|
---|
| 96 | ctx->x[1] = U32V(g[1] + rotlFixed(g[0], 8) + g[7]);
|
---|
| 97 | ctx->x[2] = U32V(g[2] + rotlFixed(g[1],16) + rotlFixed(g[0], 16));
|
---|
| 98 | ctx->x[3] = U32V(g[3] + rotlFixed(g[2], 8) + g[1]);
|
---|
| 99 | ctx->x[4] = U32V(g[4] + rotlFixed(g[3],16) + rotlFixed(g[2], 16));
|
---|
| 100 | ctx->x[5] = U32V(g[5] + rotlFixed(g[4], 8) + g[3]);
|
---|
| 101 | ctx->x[6] = U32V(g[6] + rotlFixed(g[5],16) + rotlFixed(g[4], 16));
|
---|
| 102 | ctx->x[7] = U32V(g[7] + rotlFixed(g[6], 8) + g[5]);
|
---|
| 103 | }
|
---|
| 104 |
|
---|
| 105 |
|
---|
| 106 | /* IV setup */
|
---|
| 107 | static void wc_RabbitSetIV(Rabbit* ctx, const byte* inIv)
|
---|
| 108 | {
|
---|
| 109 | /* Temporary variables */
|
---|
| 110 | word32 i0, i1, i2, i3, i;
|
---|
| 111 | word32 iv[2];
|
---|
| 112 |
|
---|
| 113 | if (inIv)
|
---|
| 114 | XMEMCPY(iv, inIv, sizeof(iv));
|
---|
| 115 | else
|
---|
| 116 | XMEMSET(iv, 0, sizeof(iv));
|
---|
| 117 |
|
---|
| 118 | /* Generate four subvectors */
|
---|
| 119 | i0 = LITTLE32(iv[0]);
|
---|
| 120 | i2 = LITTLE32(iv[1]);
|
---|
| 121 | i1 = (i0>>16) | (i2&0xFFFF0000);
|
---|
| 122 | i3 = (i2<<16) | (i0&0x0000FFFF);
|
---|
| 123 |
|
---|
| 124 | /* Modify counter values */
|
---|
| 125 | ctx->workCtx.c[0] = ctx->masterCtx.c[0] ^ i0;
|
---|
| 126 | ctx->workCtx.c[1] = ctx->masterCtx.c[1] ^ i1;
|
---|
| 127 | ctx->workCtx.c[2] = ctx->masterCtx.c[2] ^ i2;
|
---|
| 128 | ctx->workCtx.c[3] = ctx->masterCtx.c[3] ^ i3;
|
---|
| 129 | ctx->workCtx.c[4] = ctx->masterCtx.c[4] ^ i0;
|
---|
| 130 | ctx->workCtx.c[5] = ctx->masterCtx.c[5] ^ i1;
|
---|
| 131 | ctx->workCtx.c[6] = ctx->masterCtx.c[6] ^ i2;
|
---|
| 132 | ctx->workCtx.c[7] = ctx->masterCtx.c[7] ^ i3;
|
---|
| 133 |
|
---|
| 134 | /* Copy state variables */
|
---|
| 135 | for (i=0; i<8; i++)
|
---|
| 136 | ctx->workCtx.x[i] = ctx->masterCtx.x[i];
|
---|
| 137 | ctx->workCtx.carry = ctx->masterCtx.carry;
|
---|
| 138 |
|
---|
| 139 | /* Iterate the system four times */
|
---|
| 140 | for (i=0; i<4; i++)
|
---|
| 141 | RABBIT_next_state(&(ctx->workCtx));
|
---|
| 142 | }
|
---|
| 143 |
|
---|
| 144 |
|
---|
| 145 | /* Key setup */
|
---|
| 146 | static INLINE int DoKey(Rabbit* ctx, const byte* key, const byte* iv)
|
---|
| 147 | {
|
---|
| 148 | /* Temporary variables */
|
---|
| 149 | word32 k0, k1, k2, k3, i;
|
---|
| 150 |
|
---|
| 151 | /* Generate four subkeys */
|
---|
| 152 | k0 = LITTLE32(*(word32*)(key+ 0));
|
---|
| 153 | k1 = LITTLE32(*(word32*)(key+ 4));
|
---|
| 154 | k2 = LITTLE32(*(word32*)(key+ 8));
|
---|
| 155 | k3 = LITTLE32(*(word32*)(key+12));
|
---|
| 156 |
|
---|
| 157 | /* Generate initial state variables */
|
---|
| 158 | ctx->masterCtx.x[0] = k0;
|
---|
| 159 | ctx->masterCtx.x[2] = k1;
|
---|
| 160 | ctx->masterCtx.x[4] = k2;
|
---|
| 161 | ctx->masterCtx.x[6] = k3;
|
---|
| 162 | ctx->masterCtx.x[1] = U32V(k3<<16) | (k2>>16);
|
---|
| 163 | ctx->masterCtx.x[3] = U32V(k0<<16) | (k3>>16);
|
---|
| 164 | ctx->masterCtx.x[5] = U32V(k1<<16) | (k0>>16);
|
---|
| 165 | ctx->masterCtx.x[7] = U32V(k2<<16) | (k1>>16);
|
---|
| 166 |
|
---|
| 167 | /* Generate initial counter values */
|
---|
| 168 | ctx->masterCtx.c[0] = rotlFixed(k2, 16);
|
---|
| 169 | ctx->masterCtx.c[2] = rotlFixed(k3, 16);
|
---|
| 170 | ctx->masterCtx.c[4] = rotlFixed(k0, 16);
|
---|
| 171 | ctx->masterCtx.c[6] = rotlFixed(k1, 16);
|
---|
| 172 | ctx->masterCtx.c[1] = (k0&0xFFFF0000) | (k1&0xFFFF);
|
---|
| 173 | ctx->masterCtx.c[3] = (k1&0xFFFF0000) | (k2&0xFFFF);
|
---|
| 174 | ctx->masterCtx.c[5] = (k2&0xFFFF0000) | (k3&0xFFFF);
|
---|
| 175 | ctx->masterCtx.c[7] = (k3&0xFFFF0000) | (k0&0xFFFF);
|
---|
| 176 |
|
---|
| 177 | /* Clear carry bit */
|
---|
| 178 | ctx->masterCtx.carry = 0;
|
---|
| 179 |
|
---|
| 180 | /* Iterate the system four times */
|
---|
| 181 | for (i=0; i<4; i++)
|
---|
| 182 | RABBIT_next_state(&(ctx->masterCtx));
|
---|
| 183 |
|
---|
| 184 | /* Modify the counters */
|
---|
| 185 | for (i=0; i<8; i++)
|
---|
| 186 | ctx->masterCtx.c[i] ^= ctx->masterCtx.x[(i+4)&0x7];
|
---|
| 187 |
|
---|
| 188 | /* Copy master instance to work instance */
|
---|
| 189 | for (i=0; i<8; i++) {
|
---|
| 190 | ctx->workCtx.x[i] = ctx->masterCtx.x[i];
|
---|
| 191 | ctx->workCtx.c[i] = ctx->masterCtx.c[i];
|
---|
| 192 | }
|
---|
| 193 | ctx->workCtx.carry = ctx->masterCtx.carry;
|
---|
| 194 |
|
---|
| 195 | wc_RabbitSetIV(ctx, iv);
|
---|
| 196 |
|
---|
| 197 | return 0;
|
---|
| 198 | }
|
---|
| 199 |
|
---|
| 200 |
|
---|
| 201 | /* Key setup */
|
---|
| 202 | int wc_RabbitSetKey(Rabbit* ctx, const byte* key, const byte* iv)
|
---|
| 203 | {
|
---|
| 204 | #ifdef XSTREAM_ALIGN
|
---|
| 205 | if ((wolfssl_word)key % 4) {
|
---|
| 206 | int alignKey[4];
|
---|
| 207 |
|
---|
| 208 | /* iv aligned in SetIV */
|
---|
| 209 | WOLFSSL_MSG("wc_RabbitSetKey unaligned key");
|
---|
| 210 |
|
---|
| 211 | XMEMCPY(alignKey, key, sizeof(alignKey));
|
---|
| 212 |
|
---|
| 213 | return DoKey(ctx, (const byte*)alignKey, iv);
|
---|
| 214 | }
|
---|
| 215 | #endif /* XSTREAM_ALIGN */
|
---|
| 216 |
|
---|
| 217 | return DoKey(ctx, key, iv);
|
---|
| 218 | }
|
---|
| 219 |
|
---|
| 220 |
|
---|
| 221 | /* Encrypt/decrypt a message of any size */
|
---|
| 222 | static INLINE int DoProcess(Rabbit* ctx, byte* output, const byte* input,
|
---|
| 223 | word32 msglen)
|
---|
| 224 | {
|
---|
| 225 | /* Encrypt/decrypt all full blocks */
|
---|
| 226 | while (msglen >= 16) {
|
---|
| 227 | /* Iterate the system */
|
---|
| 228 | RABBIT_next_state(&(ctx->workCtx));
|
---|
| 229 |
|
---|
| 230 | /* Encrypt/decrypt 16 bytes of data */
|
---|
| 231 | *(word32*)(output+ 0) = *(word32*)(input+ 0) ^
|
---|
| 232 | LITTLE32(ctx->workCtx.x[0] ^ (ctx->workCtx.x[5]>>16) ^
|
---|
| 233 | U32V(ctx->workCtx.x[3]<<16));
|
---|
| 234 | *(word32*)(output+ 4) = *(word32*)(input+ 4) ^
|
---|
| 235 | LITTLE32(ctx->workCtx.x[2] ^ (ctx->workCtx.x[7]>>16) ^
|
---|
| 236 | U32V(ctx->workCtx.x[5]<<16));
|
---|
| 237 | *(word32*)(output+ 8) = *(word32*)(input+ 8) ^
|
---|
| 238 | LITTLE32(ctx->workCtx.x[4] ^ (ctx->workCtx.x[1]>>16) ^
|
---|
| 239 | U32V(ctx->workCtx.x[7]<<16));
|
---|
| 240 | *(word32*)(output+12) = *(word32*)(input+12) ^
|
---|
| 241 | LITTLE32(ctx->workCtx.x[6] ^ (ctx->workCtx.x[3]>>16) ^
|
---|
| 242 | U32V(ctx->workCtx.x[1]<<16));
|
---|
| 243 |
|
---|
| 244 | /* Increment pointers and decrement length */
|
---|
| 245 | input += 16;
|
---|
| 246 | output += 16;
|
---|
| 247 | msglen -= 16;
|
---|
| 248 | }
|
---|
| 249 |
|
---|
| 250 | /* Encrypt/decrypt remaining data */
|
---|
| 251 | if (msglen) {
|
---|
| 252 |
|
---|
| 253 | word32 i;
|
---|
| 254 | word32 tmp[4];
|
---|
| 255 | byte* buffer = (byte*)tmp;
|
---|
| 256 |
|
---|
| 257 | XMEMSET(tmp, 0, sizeof(tmp)); /* help static analysis */
|
---|
| 258 |
|
---|
| 259 | /* Iterate the system */
|
---|
| 260 | RABBIT_next_state(&(ctx->workCtx));
|
---|
| 261 |
|
---|
| 262 | /* Generate 16 bytes of pseudo-random data */
|
---|
| 263 | tmp[0] = LITTLE32(ctx->workCtx.x[0] ^
|
---|
| 264 | (ctx->workCtx.x[5]>>16) ^ U32V(ctx->workCtx.x[3]<<16));
|
---|
| 265 | tmp[1] = LITTLE32(ctx->workCtx.x[2] ^
|
---|
| 266 | (ctx->workCtx.x[7]>>16) ^ U32V(ctx->workCtx.x[5]<<16));
|
---|
| 267 | tmp[2] = LITTLE32(ctx->workCtx.x[4] ^
|
---|
| 268 | (ctx->workCtx.x[1]>>16) ^ U32V(ctx->workCtx.x[7]<<16));
|
---|
| 269 | tmp[3] = LITTLE32(ctx->workCtx.x[6] ^
|
---|
| 270 | (ctx->workCtx.x[3]>>16) ^ U32V(ctx->workCtx.x[1]<<16));
|
---|
| 271 |
|
---|
| 272 | /* Encrypt/decrypt the data */
|
---|
| 273 | for (i=0; i<msglen; i++)
|
---|
| 274 | output[i] = input[i] ^ buffer[i];
|
---|
| 275 | }
|
---|
| 276 |
|
---|
| 277 | return 0;
|
---|
| 278 | }
|
---|
| 279 |
|
---|
| 280 |
|
---|
| 281 | /* Encrypt/decrypt a message of any size */
|
---|
| 282 | int wc_RabbitProcess(Rabbit* ctx, byte* output, const byte* input, word32 msglen)
|
---|
| 283 | {
|
---|
| 284 | #ifdef XSTREAM_ALIGN
|
---|
| 285 | if ((wolfssl_word)input % 4 || (wolfssl_word)output % 4) {
|
---|
| 286 | #ifndef NO_WOLFSSL_ALLOC_ALIGN
|
---|
| 287 | byte* tmp;
|
---|
| 288 | WOLFSSL_MSG("wc_RabbitProcess unaligned");
|
---|
| 289 |
|
---|
| 290 | tmp = (byte*)XMALLOC(msglen, NULL, DYNAMIC_TYPE_TMP_BUFFER);
|
---|
| 291 | if (tmp == NULL) return MEMORY_E;
|
---|
| 292 |
|
---|
| 293 | XMEMCPY(tmp, input, msglen);
|
---|
| 294 | DoProcess(ctx, tmp, tmp, msglen);
|
---|
| 295 | XMEMCPY(output, tmp, msglen);
|
---|
| 296 |
|
---|
| 297 | XFREE(tmp, NULL, DYNAMIC_TYPE_TMP_BUFFER);
|
---|
| 298 |
|
---|
| 299 | return 0;
|
---|
| 300 | #else
|
---|
| 301 | return BAD_ALIGN_E;
|
---|
| 302 | #endif
|
---|
| 303 | }
|
---|
| 304 | #endif /* XSTREAM_ALIGN */
|
---|
| 305 |
|
---|
| 306 | return DoProcess(ctx, output, input, msglen);
|
---|
| 307 | }
|
---|
| 308 |
|
---|
| 309 |
|
---|
| 310 | #endif /* NO_RABBIT */
|
---|