Francois Berder / cyassl-lib

fork of cyassl-lib

Dependents:   TLS_cyassl TLS_cyassl

ctaocrypt/src/hc128.c@0:714293de3836, 2013-09-05 (annotated)

Committer:
ashleymills
Date:
Thu Sep 05 10:33:04 2013 +0000
Revision:
0:714293de3836
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ashleymills 0:714293de3836 1 /* hc128.c
ashleymills 0:714293de3836 2 *
ashleymills 0:714293de3836 3 * Copyright (C) 2006-2013 wolfSSL Inc.
ashleymills 0:714293de3836 4 *
ashleymills 0:714293de3836 5 * This file is part of CyaSSL.
ashleymills 0:714293de3836 6 *
ashleymills 0:714293de3836 7 * CyaSSL is free software; you can redistribute it and/or modify
ashleymills 0:714293de3836 8 * it under the terms of the GNU General Public License as published by
ashleymills 0:714293de3836 9 * the Free Software Foundation; either version 2 of the License, or
ashleymills 0:714293de3836 10 * (at your option) any later version.
ashleymills 0:714293de3836 11 *
ashleymills 0:714293de3836 12 * CyaSSL is distributed in the hope that it will be useful,
ashleymills 0:714293de3836 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
ashleymills 0:714293de3836 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
ashleymills 0:714293de3836 15 * GNU General Public License for more details.
ashleymills 0:714293de3836 16 *
ashleymills 0:714293de3836 17 * You should have received a copy of the GNU General Public License
ashleymills 0:714293de3836 18 * along with this program; if not, write to the Free Software
ashleymills 0:714293de3836 19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
ashleymills 0:714293de3836 20 */
ashleymills 0:714293de3836 21
ashleymills 0:714293de3836 22 #ifdef HAVE_CONFIG_H
ashleymills 0:714293de3836 23 #include <config.h>
ashleymills 0:714293de3836 24 #endif
ashleymills 0:714293de3836 25
ashleymills 0:714293de3836 26 #include <cyassl/ctaocrypt/settings.h>
ashleymills 0:714293de3836 27
ashleymills 0:714293de3836 28 #ifdef HAVE_HC128
ashleymills 0:714293de3836 29
ashleymills 0:714293de3836 30 #include <cyassl/ctaocrypt/hc128.h>
ashleymills 0:714293de3836 31 #include <cyassl/ctaocrypt/ctaoerror2.h>
ashleymills 0:714293de3836 32 #include <cyassl/ctaocrypt/logging.h>
ashleymills 0:714293de3836 33 #ifdef NO_INLINE
ashleymills 0:714293de3836 34 #include <cyassl/ctaocrypt/hc128.h>
ashleymills 0:714293de3836 35 #include <cyassl/ctaocrypt/misc.h>
ashleymills 0:714293de3836 36 #else
ashleymills 0:714293de3836 37 #include <ctaocrypt/src/misc.c>
ashleymills 0:714293de3836 38 #endif
ashleymills 0:714293de3836 39
ashleymills 0:714293de3836 40
ashleymills 0:714293de3836 41 #ifdef BIG_ENDIAN_ORDER
ashleymills 0:714293de3836 42 #define LITTLE32(x) ByteReverseWord32(x)
ashleymills 0:714293de3836 43 #else
ashleymills 0:714293de3836 44 #define LITTLE32(x) (x)
ashleymills 0:714293de3836 45 #endif
ashleymills 0:714293de3836 46
ashleymills 0:714293de3836 47
ashleymills 0:714293de3836 48 /*h1 function*/
ashleymills 0:714293de3836 49 #define h1(ctx, x, y) { \
ashleymills 0:714293de3836 50 byte a,c; \
ashleymills 0:714293de3836 51 a = (byte) (x); \
ashleymills 0:714293de3836 52 c = (byte) ((x) >> 16); \
ashleymills 0:714293de3836 53 y = (ctx->T[512+a])+(ctx->T[512+256+c]); \
ashleymills 0:714293de3836 54 }
ashleymills 0:714293de3836 55
ashleymills 0:714293de3836 56 /*h2 function*/
ashleymills 0:714293de3836 57 #define h2(ctx, x, y) { \
ashleymills 0:714293de3836 58 byte a,c; \
ashleymills 0:714293de3836 59 a = (byte) (x); \
ashleymills 0:714293de3836 60 c = (byte) ((x) >> 16); \
ashleymills 0:714293de3836 61 y = (ctx->T[a])+(ctx->T[256+c]); \
ashleymills 0:714293de3836 62 }
ashleymills 0:714293de3836 63
ashleymills 0:714293de3836 64 /*one step of HC-128, update P and generate 32 bits keystream*/
ashleymills 0:714293de3836 65 #define step_P(ctx,u,v,a,b,c,d,n){ \
ashleymills 0:714293de3836 66 word32 tem0,tem1,tem2,tem3; \
ashleymills 0:714293de3836 67 h1((ctx),(ctx->X[(d)]),tem3); \
ashleymills 0:714293de3836 68 tem0 = rotrFixed((ctx->T[(v)]),23); \
ashleymills 0:714293de3836 69 tem1 = rotrFixed((ctx->X[(c)]),10); \
ashleymills 0:714293de3836 70 tem2 = rotrFixed((ctx->X[(b)]),8); \
ashleymills 0:714293de3836 71 (ctx->T[(u)]) += tem2+(tem0 ^ tem1); \
ashleymills 0:714293de3836 72 (ctx->X[(a)]) = (ctx->T[(u)]); \
ashleymills 0:714293de3836 73 (n) = tem3 ^ (ctx->T[(u)]) ; \
ashleymills 0:714293de3836 74 }
ashleymills 0:714293de3836 75
ashleymills 0:714293de3836 76 /*one step of HC-128, update Q and generate 32 bits keystream*/
ashleymills 0:714293de3836 77 #define step_Q(ctx,u,v,a,b,c,d,n){ \
ashleymills 0:714293de3836 78 word32 tem0,tem1,tem2,tem3; \
ashleymills 0:714293de3836 79 h2((ctx),(ctx->Y[(d)]),tem3); \
ashleymills 0:714293de3836 80 tem0 = rotrFixed((ctx->T[(v)]),(32-23)); \
ashleymills 0:714293de3836 81 tem1 = rotrFixed((ctx->Y[(c)]),(32-10)); \
ashleymills 0:714293de3836 82 tem2 = rotrFixed((ctx->Y[(b)]),(32-8)); \
ashleymills 0:714293de3836 83 (ctx->T[(u)]) += tem2 + (tem0 ^ tem1); \
ashleymills 0:714293de3836 84 (ctx->Y[(a)]) = (ctx->T[(u)]); \
ashleymills 0:714293de3836 85 (n) = tem3 ^ (ctx->T[(u)]) ; \
ashleymills 0:714293de3836 86 }
ashleymills 0:714293de3836 87
ashleymills 0:714293de3836 88 /*16 steps of HC-128, generate 512 bits keystream*/
ashleymills 0:714293de3836 89 static void generate_keystream(HC128* ctx, word32* keystream)
ashleymills 0:714293de3836 90 {
ashleymills 0:714293de3836 91 word32 cc,dd;
ashleymills 0:714293de3836 92 cc = ctx->counter1024 & 0x1ff;
ashleymills 0:714293de3836 93 dd = (cc+16)&0x1ff;
ashleymills 0:714293de3836 94
ashleymills 0:714293de3836 95 if (ctx->counter1024 < 512)
ashleymills 0:714293de3836 96 {
ashleymills 0:714293de3836 97 ctx->counter1024 = (ctx->counter1024 + 16) & 0x3ff;
ashleymills 0:714293de3836 98 step_P(ctx, cc+0, cc+1, 0, 6, 13,4, keystream[0]);
ashleymills 0:714293de3836 99 step_P(ctx, cc+1, cc+2, 1, 7, 14,5, keystream[1]);
ashleymills 0:714293de3836 100 step_P(ctx, cc+2, cc+3, 2, 8, 15,6, keystream[2]);
ashleymills 0:714293de3836 101 step_P(ctx, cc+3, cc+4, 3, 9, 0, 7, keystream[3]);
ashleymills 0:714293de3836 102 step_P(ctx, cc+4, cc+5, 4, 10,1, 8, keystream[4]);
ashleymills 0:714293de3836 103 step_P(ctx, cc+5, cc+6, 5, 11,2, 9, keystream[5]);
ashleymills 0:714293de3836 104 step_P(ctx, cc+6, cc+7, 6, 12,3, 10,keystream[6]);
ashleymills 0:714293de3836 105 step_P(ctx, cc+7, cc+8, 7, 13,4, 11,keystream[7]);
ashleymills 0:714293de3836 106 step_P(ctx, cc+8, cc+9, 8, 14,5, 12,keystream[8]);
ashleymills 0:714293de3836 107 step_P(ctx, cc+9, cc+10,9, 15,6, 13,keystream[9]);
ashleymills 0:714293de3836 108 step_P(ctx, cc+10,cc+11,10,0, 7, 14,keystream[10]);
ashleymills 0:714293de3836 109 step_P(ctx, cc+11,cc+12,11,1, 8, 15,keystream[11]);
ashleymills 0:714293de3836 110 step_P(ctx, cc+12,cc+13,12,2, 9, 0, keystream[12]);
ashleymills 0:714293de3836 111 step_P(ctx, cc+13,cc+14,13,3, 10,1, keystream[13]);
ashleymills 0:714293de3836 112 step_P(ctx, cc+14,cc+15,14,4, 11,2, keystream[14]);
ashleymills 0:714293de3836 113 step_P(ctx, cc+15,dd+0, 15,5, 12,3, keystream[15]);
ashleymills 0:714293de3836 114 }
ashleymills 0:714293de3836 115 else
ashleymills 0:714293de3836 116 {
ashleymills 0:714293de3836 117 ctx->counter1024 = (ctx->counter1024 + 16) & 0x3ff;
ashleymills 0:714293de3836 118 step_Q(ctx, 512+cc+0, 512+cc+1, 0, 6, 13,4, keystream[0]);
ashleymills 0:714293de3836 119 step_Q(ctx, 512+cc+1, 512+cc+2, 1, 7, 14,5, keystream[1]);
ashleymills 0:714293de3836 120 step_Q(ctx, 512+cc+2, 512+cc+3, 2, 8, 15,6, keystream[2]);
ashleymills 0:714293de3836 121 step_Q(ctx, 512+cc+3, 512+cc+4, 3, 9, 0, 7, keystream[3]);
ashleymills 0:714293de3836 122 step_Q(ctx, 512+cc+4, 512+cc+5, 4, 10,1, 8, keystream[4]);
ashleymills 0:714293de3836 123 step_Q(ctx, 512+cc+5, 512+cc+6, 5, 11,2, 9, keystream[5]);
ashleymills 0:714293de3836 124 step_Q(ctx, 512+cc+6, 512+cc+7, 6, 12,3, 10,keystream[6]);
ashleymills 0:714293de3836 125 step_Q(ctx, 512+cc+7, 512+cc+8, 7, 13,4, 11,keystream[7]);
ashleymills 0:714293de3836 126 step_Q(ctx, 512+cc+8, 512+cc+9, 8, 14,5, 12,keystream[8]);
ashleymills 0:714293de3836 127 step_Q(ctx, 512+cc+9, 512+cc+10,9, 15,6, 13,keystream[9]);
ashleymills 0:714293de3836 128 step_Q(ctx, 512+cc+10,512+cc+11,10,0, 7, 14,keystream[10]);
ashleymills 0:714293de3836 129 step_Q(ctx, 512+cc+11,512+cc+12,11,1, 8, 15,keystream[11]);
ashleymills 0:714293de3836 130 step_Q(ctx, 512+cc+12,512+cc+13,12,2, 9, 0, keystream[12]);
ashleymills 0:714293de3836 131 step_Q(ctx, 512+cc+13,512+cc+14,13,3, 10,1, keystream[13]);
ashleymills 0:714293de3836 132 step_Q(ctx, 512+cc+14,512+cc+15,14,4, 11,2, keystream[14]);
ashleymills 0:714293de3836 133 step_Q(ctx, 512+cc+15,512+dd+0, 15,5, 12,3, keystream[15]);
ashleymills 0:714293de3836 134 }
ashleymills 0:714293de3836 135 }
ashleymills 0:714293de3836 136
ashleymills 0:714293de3836 137
ashleymills 0:714293de3836 138 /* The following defines the initialization functions */
ashleymills 0:714293de3836 139 #define f1(x) (rotrFixed((x),7) ^ rotrFixed((x),18) ^ ((x) >> 3))
ashleymills 0:714293de3836 140 #define f2(x) (rotrFixed((x),17) ^ rotrFixed((x),19) ^ ((x) >> 10))
ashleymills 0:714293de3836 141
ashleymills 0:714293de3836 142 /*update table P*/
ashleymills 0:714293de3836 143 #define update_P(ctx,u,v,a,b,c,d){ \
ashleymills 0:714293de3836 144 word32 tem0,tem1,tem2,tem3; \
ashleymills 0:714293de3836 145 tem0 = rotrFixed((ctx->T[(v)]),23); \
ashleymills 0:714293de3836 146 tem1 = rotrFixed((ctx->X[(c)]),10); \
ashleymills 0:714293de3836 147 tem2 = rotrFixed((ctx->X[(b)]),8); \
ashleymills 0:714293de3836 148 h1((ctx),(ctx->X[(d)]),tem3); \
ashleymills 0:714293de3836 149 (ctx->T[(u)]) = ((ctx->T[(u)]) + tem2+(tem0^tem1)) ^ tem3; \
ashleymills 0:714293de3836 150 (ctx->X[(a)]) = (ctx->T[(u)]); \
ashleymills 0:714293de3836 151 }
ashleymills 0:714293de3836 152
ashleymills 0:714293de3836 153 /*update table Q*/
ashleymills 0:714293de3836 154 #define update_Q(ctx,u,v,a,b,c,d){ \
ashleymills 0:714293de3836 155 word32 tem0,tem1,tem2,tem3; \
ashleymills 0:714293de3836 156 tem0 = rotrFixed((ctx->T[(v)]),(32-23)); \
ashleymills 0:714293de3836 157 tem1 = rotrFixed((ctx->Y[(c)]),(32-10)); \
ashleymills 0:714293de3836 158 tem2 = rotrFixed((ctx->Y[(b)]),(32-8)); \
ashleymills 0:714293de3836 159 h2((ctx),(ctx->Y[(d)]),tem3); \
ashleymills 0:714293de3836 160 (ctx->T[(u)]) = ((ctx->T[(u)]) + tem2+(tem0^tem1)) ^ tem3; \
ashleymills 0:714293de3836 161 (ctx->Y[(a)]) = (ctx->T[(u)]); \
ashleymills 0:714293de3836 162 }
ashleymills 0:714293de3836 163
ashleymills 0:714293de3836 164 /*16 steps of HC-128, without generating keystream, */
ashleymills 0:714293de3836 165 /*but use the outputs to update P and Q*/
ashleymills 0:714293de3836 166 static void setup_update(HC128* ctx) /*each time 16 steps*/
ashleymills 0:714293de3836 167 {
ashleymills 0:714293de3836 168 word32 cc,dd;
ashleymills 0:714293de3836 169 cc = ctx->counter1024 & 0x1ff;
ashleymills 0:714293de3836 170 dd = (cc+16)&0x1ff;
ashleymills 0:714293de3836 171
ashleymills 0:714293de3836 172 if (ctx->counter1024 < 512)
ashleymills 0:714293de3836 173 {
ashleymills 0:714293de3836 174 ctx->counter1024 = (ctx->counter1024 + 16) & 0x3ff;
ashleymills 0:714293de3836 175 update_P(ctx, cc+0, cc+1, 0, 6, 13, 4);
ashleymills 0:714293de3836 176 update_P(ctx, cc+1, cc+2, 1, 7, 14, 5);
ashleymills 0:714293de3836 177 update_P(ctx, cc+2, cc+3, 2, 8, 15, 6);
ashleymills 0:714293de3836 178 update_P(ctx, cc+3, cc+4, 3, 9, 0, 7);
ashleymills 0:714293de3836 179 update_P(ctx, cc+4, cc+5, 4, 10,1, 8);
ashleymills 0:714293de3836 180 update_P(ctx, cc+5, cc+6, 5, 11,2, 9);
ashleymills 0:714293de3836 181 update_P(ctx, cc+6, cc+7, 6, 12,3, 10);
ashleymills 0:714293de3836 182 update_P(ctx, cc+7, cc+8, 7, 13,4, 11);
ashleymills 0:714293de3836 183 update_P(ctx, cc+8, cc+9, 8, 14,5, 12);
ashleymills 0:714293de3836 184 update_P(ctx, cc+9, cc+10,9, 15,6, 13);
ashleymills 0:714293de3836 185 update_P(ctx, cc+10,cc+11,10,0, 7, 14);
ashleymills 0:714293de3836 186 update_P(ctx, cc+11,cc+12,11,1, 8, 15);
ashleymills 0:714293de3836 187 update_P(ctx, cc+12,cc+13,12,2, 9, 0);
ashleymills 0:714293de3836 188 update_P(ctx, cc+13,cc+14,13,3, 10, 1);
ashleymills 0:714293de3836 189 update_P(ctx, cc+14,cc+15,14,4, 11, 2);
ashleymills 0:714293de3836 190 update_P(ctx, cc+15,dd+0, 15,5, 12, 3);
ashleymills 0:714293de3836 191 }
ashleymills 0:714293de3836 192 else
ashleymills 0:714293de3836 193 {
ashleymills 0:714293de3836 194 ctx->counter1024 = (ctx->counter1024 + 16) & 0x3ff;
ashleymills 0:714293de3836 195 update_Q(ctx, 512+cc+0, 512+cc+1, 0, 6, 13, 4);
ashleymills 0:714293de3836 196 update_Q(ctx, 512+cc+1, 512+cc+2, 1, 7, 14, 5);
ashleymills 0:714293de3836 197 update_Q(ctx, 512+cc+2, 512+cc+3, 2, 8, 15, 6);
ashleymills 0:714293de3836 198 update_Q(ctx, 512+cc+3, 512+cc+4, 3, 9, 0, 7);
ashleymills 0:714293de3836 199 update_Q(ctx, 512+cc+4, 512+cc+5, 4, 10,1, 8);
ashleymills 0:714293de3836 200 update_Q(ctx, 512+cc+5, 512+cc+6, 5, 11,2, 9);
ashleymills 0:714293de3836 201 update_Q(ctx, 512+cc+6, 512+cc+7, 6, 12,3, 10);
ashleymills 0:714293de3836 202 update_Q(ctx, 512+cc+7, 512+cc+8, 7, 13,4, 11);
ashleymills 0:714293de3836 203 update_Q(ctx, 512+cc+8, 512+cc+9, 8, 14,5, 12);
ashleymills 0:714293de3836 204 update_Q(ctx, 512+cc+9, 512+cc+10,9, 15,6, 13);
ashleymills 0:714293de3836 205 update_Q(ctx, 512+cc+10,512+cc+11,10,0, 7, 14);
ashleymills 0:714293de3836 206 update_Q(ctx, 512+cc+11,512+cc+12,11,1, 8, 15);
ashleymills 0:714293de3836 207 update_Q(ctx, 512+cc+12,512+cc+13,12,2, 9, 0);
ashleymills 0:714293de3836 208 update_Q(ctx, 512+cc+13,512+cc+14,13,3, 10, 1);
ashleymills 0:714293de3836 209 update_Q(ctx, 512+cc+14,512+cc+15,14,4, 11, 2);
ashleymills 0:714293de3836 210 update_Q(ctx, 512+cc+15,512+dd+0, 15,5, 12, 3);
ashleymills 0:714293de3836 211 }
ashleymills 0:714293de3836 212 }
ashleymills 0:714293de3836 213
ashleymills 0:714293de3836 214
ashleymills 0:714293de3836 215 /* for the 128-bit key: key[0]...key[15]
ashleymills 0:714293de3836 216 * key[0] is the least significant byte of ctx->key[0] (K_0);
ashleymills 0:714293de3836 217 * key[3] is the most significant byte of ctx->key[0] (K_0);
ashleymills 0:714293de3836 218 * ...
ashleymills 0:714293de3836 219 * key[12] is the least significant byte of ctx->key[3] (K_3)
ashleymills 0:714293de3836 220 * key[15] is the most significant byte of ctx->key[3] (K_3)
ashleymills 0:714293de3836 221 *
ashleymills 0:714293de3836 222 * for the 128-bit iv: iv[0]...iv[15]
ashleymills 0:714293de3836 223 * iv[0] is the least significant byte of ctx->iv[0] (IV_0);
ashleymills 0:714293de3836 224 * iv[3] is the most significant byte of ctx->iv[0] (IV_0);
ashleymills 0:714293de3836 225 * ...
ashleymills 0:714293de3836 226 * iv[12] is the least significant byte of ctx->iv[3] (IV_3)
ashleymills 0:714293de3836 227 * iv[15] is the most significant byte of ctx->iv[3] (IV_3)
ashleymills 0:714293de3836 228 */
ashleymills 0:714293de3836 229
ashleymills 0:714293de3836 230
ashleymills 0:714293de3836 231
ashleymills 0:714293de3836 232 static void Hc128_SetIV(HC128* ctx, const byte* iv)
ashleymills 0:714293de3836 233 {
ashleymills 0:714293de3836 234 word32 i;
ashleymills 0:714293de3836 235
ashleymills 0:714293de3836 236 for (i = 0; i < (128 >> 5); i++)
ashleymills 0:714293de3836 237 ctx->iv[i] = LITTLE32(((word32*)iv)[i]);
ashleymills 0:714293de3836 238
ashleymills 0:714293de3836 239 for (; i < 8; i++) ctx->iv[i] = ctx->iv[i-4];
ashleymills 0:714293de3836 240
ashleymills 0:714293de3836 241 /* expand the key and IV into the table T */
ashleymills 0:714293de3836 242 /* (expand the key and IV into the table P and Q) */
ashleymills 0:714293de3836 243
ashleymills 0:714293de3836 244 for (i = 0; i < 8; i++) ctx->T[i] = ctx->key[i];
ashleymills 0:714293de3836 245 for (i = 8; i < 16; i++) ctx->T[i] = ctx->iv[i-8];
ashleymills 0:714293de3836 246
ashleymills 0:714293de3836 247 for (i = 16; i < (256+16); i++)
ashleymills 0:714293de3836 248 ctx->T[i] = f2(ctx->T[i-2]) + ctx->T[i-7] + f1(ctx->T[i-15]) +
ashleymills 0:714293de3836 249 ctx->T[i-16]+i;
ashleymills 0:714293de3836 250
ashleymills 0:714293de3836 251 for (i = 0; i < 16; i++) ctx->T[i] = ctx->T[256+i];
ashleymills 0:714293de3836 252
ashleymills 0:714293de3836 253 for (i = 16; i < 1024; i++)
ashleymills 0:714293de3836 254 ctx->T[i] = f2(ctx->T[i-2]) + ctx->T[i-7] + f1(ctx->T[i-15]) +
ashleymills 0:714293de3836 255 ctx->T[i-16]+256+i;
ashleymills 0:714293de3836 256
ashleymills 0:714293de3836 257 /* initialize counter1024, X and Y */
ashleymills 0:714293de3836 258 ctx->counter1024 = 0;
ashleymills 0:714293de3836 259 for (i = 0; i < 16; i++) ctx->X[i] = ctx->T[512-16+i];
ashleymills 0:714293de3836 260 for (i = 0; i < 16; i++) ctx->Y[i] = ctx->T[512+512-16+i];
ashleymills 0:714293de3836 261
ashleymills 0:714293de3836 262 /* run the cipher 1024 steps before generating the output */
ashleymills 0:714293de3836 263 for (i = 0; i < 64; i++) setup_update(ctx);
ashleymills 0:714293de3836 264 }
ashleymills 0:714293de3836 265
ashleymills 0:714293de3836 266
ashleymills 0:714293de3836 267 static INLINE int DoKey(HC128* ctx, const byte* key, const byte* iv)
ashleymills 0:714293de3836 268 {
ashleymills 0:714293de3836 269 word32 i;
ashleymills 0:714293de3836 270
ashleymills 0:714293de3836 271 /* Key size in bits 128 */
ashleymills 0:714293de3836 272 for (i = 0; i < (128 >> 5); i++)
ashleymills 0:714293de3836 273 ctx->key[i] = LITTLE32(((word32*)key)[i]);
ashleymills 0:714293de3836 274
ashleymills 0:714293de3836 275 for ( ; i < 8 ; i++) ctx->key[i] = ctx->key[i-4];
ashleymills 0:714293de3836 276
ashleymills 0:714293de3836 277 Hc128_SetIV(ctx, iv);
ashleymills 0:714293de3836 278
ashleymills 0:714293de3836 279 return 0;
ashleymills 0:714293de3836 280 }
ashleymills 0:714293de3836 281
ashleymills 0:714293de3836 282
ashleymills 0:714293de3836 283 /* Key setup */
ashleymills 0:714293de3836 284 int Hc128_SetKey(HC128* ctx, const byte* key, const byte* iv)
ashleymills 0:714293de3836 285 {
ashleymills 0:714293de3836 286 #ifdef XSTREAM_ALIGN
ashleymills 0:714293de3836 287 if ((word)key % 4 || (word)iv % 4) {
ashleymills 0:714293de3836 288 int alignKey[4];
ashleymills 0:714293de3836 289 int alignIv[4];
ashleymills 0:714293de3836 290
ashleymills 0:714293de3836 291 CYASSL_MSG("Hc128SetKey unaligned key/iv");
ashleymills 0:714293de3836 292
ashleymills 0:714293de3836 293 XMEMCPY(alignKey, key, sizeof(alignKey));
ashleymills 0:714293de3836 294 XMEMCPY(alignIv, iv, sizeof(alignIv));
ashleymills 0:714293de3836 295
ashleymills 0:714293de3836 296 return DoKey(ctx, (const byte*)alignKey, (const byte*)alignIv);
ashleymills 0:714293de3836 297 }
ashleymills 0:714293de3836 298 #endif /* XSTREAM_ALIGN */
ashleymills 0:714293de3836 299
ashleymills 0:714293de3836 300 return DoKey(ctx, key, iv);
ashleymills 0:714293de3836 301 }
ashleymills 0:714293de3836 302
ashleymills 0:714293de3836 303
ashleymills 0:714293de3836 304
ashleymills 0:714293de3836 305 /* The following defines the encryption of data stream */
ashleymills 0:714293de3836 306 static INLINE int DoProcess(HC128* ctx, byte* output, const byte* input,
ashleymills 0:714293de3836 307 word32 msglen)
ashleymills 0:714293de3836 308 {
ashleymills 0:714293de3836 309 word32 i, keystream[16];
ashleymills 0:714293de3836 310
ashleymills 0:714293de3836 311 for ( ; msglen >= 64; msglen -= 64, input += 64, output += 64)
ashleymills 0:714293de3836 312 {
ashleymills 0:714293de3836 313 generate_keystream(ctx, keystream);
ashleymills 0:714293de3836 314
ashleymills 0:714293de3836 315 /* unroll loop */
ashleymills 0:714293de3836 316 ((word32*)output)[0] = ((word32*)input)[0] ^ LITTLE32(keystream[0]);
ashleymills 0:714293de3836 317 ((word32*)output)[1] = ((word32*)input)[1] ^ LITTLE32(keystream[1]);
ashleymills 0:714293de3836 318 ((word32*)output)[2] = ((word32*)input)[2] ^ LITTLE32(keystream[2]);
ashleymills 0:714293de3836 319 ((word32*)output)[3] = ((word32*)input)[3] ^ LITTLE32(keystream[3]);
ashleymills 0:714293de3836 320 ((word32*)output)[4] = ((word32*)input)[4] ^ LITTLE32(keystream[4]);
ashleymills 0:714293de3836 321 ((word32*)output)[5] = ((word32*)input)[5] ^ LITTLE32(keystream[5]);
ashleymills 0:714293de3836 322 ((word32*)output)[6] = ((word32*)input)[6] ^ LITTLE32(keystream[6]);
ashleymills 0:714293de3836 323 ((word32*)output)[7] = ((word32*)input)[7] ^ LITTLE32(keystream[7]);
ashleymills 0:714293de3836 324 ((word32*)output)[8] = ((word32*)input)[8] ^ LITTLE32(keystream[8]);
ashleymills 0:714293de3836 325 ((word32*)output)[9] = ((word32*)input)[9] ^ LITTLE32(keystream[9]);
ashleymills 0:714293de3836 326 ((word32*)output)[10] = ((word32*)input)[10] ^ LITTLE32(keystream[10]);
ashleymills 0:714293de3836 327 ((word32*)output)[11] = ((word32*)input)[11] ^ LITTLE32(keystream[11]);
ashleymills 0:714293de3836 328 ((word32*)output)[12] = ((word32*)input)[12] ^ LITTLE32(keystream[12]);
ashleymills 0:714293de3836 329 ((word32*)output)[13] = ((word32*)input)[13] ^ LITTLE32(keystream[13]);
ashleymills 0:714293de3836 330 ((word32*)output)[14] = ((word32*)input)[14] ^ LITTLE32(keystream[14]);
ashleymills 0:714293de3836 331 ((word32*)output)[15] = ((word32*)input)[15] ^ LITTLE32(keystream[15]);
ashleymills 0:714293de3836 332 }
ashleymills 0:714293de3836 333
ashleymills 0:714293de3836 334 if (msglen > 0)
ashleymills 0:714293de3836 335 {
ashleymills 0:714293de3836 336 generate_keystream(ctx, keystream);
ashleymills 0:714293de3836 337
ashleymills 0:714293de3836 338 #ifdef BIG_ENDIAN_ORDER
ashleymills 0:714293de3836 339 {
ashleymills 0:714293de3836 340 word32 wordsLeft = msglen / sizeof(word32);
ashleymills 0:714293de3836 341 if (msglen % sizeof(word32)) wordsLeft++;
ashleymills 0:714293de3836 342
ashleymills 0:714293de3836 343 ByteReverseWords(keystream, keystream, wordsLeft * sizeof(word32));
ashleymills 0:714293de3836 344 }
ashleymills 0:714293de3836 345 #endif
ashleymills 0:714293de3836 346
ashleymills 0:714293de3836 347 for (i = 0; i < msglen; i++)
ashleymills 0:714293de3836 348 output[i] = input[i] ^ ((byte*)keystream)[i];
ashleymills 0:714293de3836 349 }
ashleymills 0:714293de3836 350
ashleymills 0:714293de3836 351 return 0;
ashleymills 0:714293de3836 352 }
ashleymills 0:714293de3836 353
ashleymills 0:714293de3836 354
ashleymills 0:714293de3836 355 /* Encrypt/decrypt a message of any size */
ashleymills 0:714293de3836 356 int Hc128_Process(HC128* ctx, byte* output, const byte* input, word32 msglen)
ashleymills 0:714293de3836 357 {
ashleymills 0:714293de3836 358 #ifdef XSTREAM_ALIGN
ashleymills 0:714293de3836 359 if ((word)input % 4 || (word)output % 4) {
ashleymills 0:714293de3836 360 #ifndef NO_CYASSL_ALLOC_ALIGN
ashleymills 0:714293de3836 361 byte* tmp;
ashleymills 0:714293de3836 362 CYASSL_MSG("Hc128Process unaligned");
ashleymills 0:714293de3836 363
ashleymills 0:714293de3836 364 tmp = (byte*)XMALLOC(msglen, NULL, DYNAMIC_TYPE_TMP_BUFFER);
ashleymills 0:714293de3836 365 if (tmp == NULL) return MEMORY_E;
ashleymills 0:714293de3836 366
ashleymills 0:714293de3836 367 XMEMCPY(tmp, input, msglen);
ashleymills 0:714293de3836 368 DoProcess(ctx, tmp, tmp, msglen);
ashleymills 0:714293de3836 369 XMEMCPY(output, tmp, msglen);
ashleymills 0:714293de3836 370
ashleymills 0:714293de3836 371 XFREE(tmp, NULL, DYNAMIC_TYPE_TMP_BUFFER);
ashleymills 0:714293de3836 372
ashleymills 0:714293de3836 373 return 0;
ashleymills 0:714293de3836 374 #else
ashleymills 0:714293de3836 375 return BAD_ALIGN_E;
ashleymills 0:714293de3836 376 #endif
ashleymills 0:714293de3836 377 }
ashleymills 0:714293de3836 378 #endif /* XSTREAM_ALIGN */
ashleymills 0:714293de3836 379
ashleymills 0:714293de3836 380 return DoProcess(ctx, output, input, msglen);
ashleymills 0:714293de3836 381 }
ashleymills 0:714293de3836 382
ashleymills 0:714293de3836 383
ashleymills 0:714293de3836 384 #else /* HAVE_HC128 */
ashleymills 0:714293de3836 385
ashleymills 0:714293de3836 386
ashleymills 0:714293de3836 387 #ifdef _MSC_VER
ashleymills 0:714293de3836 388 /* 4206 warning for blank file */
ashleymills 0:714293de3836 389 #pragma warning(disable: 4206)
ashleymills 0:714293de3836 390 #endif
ashleymills 0:714293de3836 391
ashleymills 0:714293de3836 392
ashleymills 0:714293de3836 393 #endif /* HAVE_HC128 */