hc128.c

00001 /* hc128.c
00002  *
00003  * Copyright (C) 2006-2016 wolfSSL Inc.
00004  *
00005  * This file is part of wolfSSL.
00006  *
00007  * wolfSSL is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2 of the License, or
00010  * (at your option) any later version.
00011  *
00012  * wolfSSL is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
00020  */
00021 
00022 
00023 #ifdef HAVE_CONFIG_H
00024     #include <config.h>
00025 #endif
00026 
00027 #include <wolfssl/wolfcrypt/settings.h>
00028 
00029 #ifdef HAVE_HC128
00030 
00031 #include <wolfssl/wolfcrypt/hc128.h>
00032 #include <wolfssl/wolfcrypt/error-crypt.h>
00033 #include <wolfssl/wolfcrypt/logging.h>
00034 #ifdef NO_INLINE
00035     #include <wolfssl/wolfcrypt/hc128.h>
00036         #include <wolfssl/wolfcrypt/misc.h>
00037 #else
00038     #include <wolfcrypt/src/misc.c>
00039 #endif
00040 
00041 
00042 #ifdef BIG_ENDIAN_ORDER
00043     #define LITTLE32(x) ByteReverseWord32(x)
00044 #else
00045     #define LITTLE32(x) (x)
00046 #endif
00047 
00048 
00049 /*h1 function*/
00050 #define h1(ctx, x, y) {                         \
00051      byte a,c;                                  \
00052      a = (byte) (x);                            \
00053      c = (byte) ((x) >> 16);                    \
00054      y = (ctx->T[512+a])+(ctx->T[512+256+c]);   \
00055 }
00056 
00057 /*h2 function*/
00058 #define h2(ctx, x, y) {                         \
00059      byte a,c;                                  \
00060      a = (byte) (x);                            \
00061      c = (byte) ((x) >> 16);                    \
00062      y = (ctx->T[a])+(ctx->T[256+c]);           \
00063 }
00064 
00065 /*one step of HC-128, update P and generate 32 bits keystream*/
00066 #define step_P(ctx,u,v,a,b,c,d,n){              \
00067      word32 tem0,tem1,tem2,tem3;                \
00068      h1((ctx),(ctx->X[(d)]),tem3);              \
00069      tem0 = rotrFixed((ctx->T[(v)]),23);        \
00070      tem1 = rotrFixed((ctx->X[(c)]),10);        \
00071      tem2 = rotrFixed((ctx->X[(b)]),8);         \
00072      (ctx->T[(u)]) += tem2+(tem0 ^ tem1);       \
00073      (ctx->X[(a)]) = (ctx->T[(u)]);             \
00074      (n) = tem3 ^ (ctx->T[(u)]) ;               \
00075 }       
00076 
00077 /*one step of HC-128, update Q and generate 32 bits keystream*/
00078 #define step_Q(ctx,u,v,a,b,c,d,n){              \
00079      word32 tem0,tem1,tem2,tem3;                \
00080      h2((ctx),(ctx->Y[(d)]),tem3);              \
00081      tem0 = rotrFixed((ctx->T[(v)]),(32-23));   \
00082      tem1 = rotrFixed((ctx->Y[(c)]),(32-10));   \
00083      tem2 = rotrFixed((ctx->Y[(b)]),(32-8));    \
00084      (ctx->T[(u)]) += tem2 + (tem0 ^ tem1);     \
00085      (ctx->Y[(a)]) = (ctx->T[(u)]);             \
00086      (n) = tem3 ^ (ctx->T[(u)]) ;               \
00087 }   
00088 
00089 /*16 steps of HC-128, generate 512 bits keystream*/
00090 static void generate_keystream(HC128* ctx, word32* keystream)  
00091 {
00092    word32 cc,dd;
00093    cc = ctx->counter1024 & 0x1ff;
00094    dd = (cc+16)&0x1ff;
00095 
00096    if (ctx->counter1024 < 512)  
00097    {        
00098       ctx->counter1024 = (ctx->counter1024 + 16) & 0x3ff;
00099       step_P(ctx, cc+0, cc+1, 0, 6, 13,4, keystream[0]);
00100       step_P(ctx, cc+1, cc+2, 1, 7, 14,5, keystream[1]);
00101       step_P(ctx, cc+2, cc+3, 2, 8, 15,6, keystream[2]);
00102       step_P(ctx, cc+3, cc+4, 3, 9, 0, 7, keystream[3]);
00103       step_P(ctx, cc+4, cc+5, 4, 10,1, 8, keystream[4]);
00104       step_P(ctx, cc+5, cc+6, 5, 11,2, 9, keystream[5]);
00105       step_P(ctx, cc+6, cc+7, 6, 12,3, 10,keystream[6]);
00106       step_P(ctx, cc+7, cc+8, 7, 13,4, 11,keystream[7]);
00107       step_P(ctx, cc+8, cc+9, 8, 14,5, 12,keystream[8]);
00108       step_P(ctx, cc+9, cc+10,9, 15,6, 13,keystream[9]);
00109       step_P(ctx, cc+10,cc+11,10,0, 7, 14,keystream[10]);
00110       step_P(ctx, cc+11,cc+12,11,1, 8, 15,keystream[11]);
00111       step_P(ctx, cc+12,cc+13,12,2, 9, 0, keystream[12]);
00112       step_P(ctx, cc+13,cc+14,13,3, 10,1, keystream[13]);
00113       step_P(ctx, cc+14,cc+15,14,4, 11,2, keystream[14]);
00114       step_P(ctx, cc+15,dd+0, 15,5, 12,3, keystream[15]);
00115    }
00116    else                 
00117    {
00118       ctx->counter1024 = (ctx->counter1024 + 16) & 0x3ff;
00119       step_Q(ctx, 512+cc+0, 512+cc+1, 0, 6, 13,4, keystream[0]);
00120       step_Q(ctx, 512+cc+1, 512+cc+2, 1, 7, 14,5, keystream[1]);
00121       step_Q(ctx, 512+cc+2, 512+cc+3, 2, 8, 15,6, keystream[2]);
00122       step_Q(ctx, 512+cc+3, 512+cc+4, 3, 9, 0, 7, keystream[3]);
00123       step_Q(ctx, 512+cc+4, 512+cc+5, 4, 10,1, 8, keystream[4]);
00124       step_Q(ctx, 512+cc+5, 512+cc+6, 5, 11,2, 9, keystream[5]);
00125       step_Q(ctx, 512+cc+6, 512+cc+7, 6, 12,3, 10,keystream[6]);
00126       step_Q(ctx, 512+cc+7, 512+cc+8, 7, 13,4, 11,keystream[7]);
00127       step_Q(ctx, 512+cc+8, 512+cc+9, 8, 14,5, 12,keystream[8]);
00128       step_Q(ctx, 512+cc+9, 512+cc+10,9, 15,6, 13,keystream[9]);
00129       step_Q(ctx, 512+cc+10,512+cc+11,10,0, 7, 14,keystream[10]);
00130       step_Q(ctx, 512+cc+11,512+cc+12,11,1, 8, 15,keystream[11]);
00131       step_Q(ctx, 512+cc+12,512+cc+13,12,2, 9, 0, keystream[12]);
00132       step_Q(ctx, 512+cc+13,512+cc+14,13,3, 10,1, keystream[13]);
00133       step_Q(ctx, 512+cc+14,512+cc+15,14,4, 11,2, keystream[14]);
00134       step_Q(ctx, 512+cc+15,512+dd+0, 15,5, 12,3, keystream[15]);
00135    }
00136 }
00137 
00138 
00139 /* The following defines the initialization functions */
00140 #define f1(x)  (rotrFixed((x),7)  ^ rotrFixed((x),18) ^ ((x) >> 3))
00141 #define f2(x)  (rotrFixed((x),17) ^ rotrFixed((x),19) ^ ((x) >> 10))
00142 
00143 /*update table P*/
00144 #define update_P(ctx,u,v,a,b,c,d){                  \
00145      word32 tem0,tem1,tem2,tem3;                    \
00146      tem0 = rotrFixed((ctx->T[(v)]),23);            \
00147      tem1 = rotrFixed((ctx->X[(c)]),10);            \
00148      tem2 = rotrFixed((ctx->X[(b)]),8);             \
00149      h1((ctx),(ctx->X[(d)]),tem3);                  \
00150      (ctx->T[(u)]) = ((ctx->T[(u)]) + tem2+(tem0^tem1)) ^ tem3;     \
00151      (ctx->X[(a)]) = (ctx->T[(u)]);                 \
00152 }  
00153 
00154 /*update table Q*/
00155 #define update_Q(ctx,u,v,a,b,c,d){                  \
00156      word32 tem0,tem1,tem2,tem3;                    \
00157      tem0 = rotrFixed((ctx->T[(v)]),(32-23));       \
00158      tem1 = rotrFixed((ctx->Y[(c)]),(32-10));       \
00159      tem2 = rotrFixed((ctx->Y[(b)]),(32-8));        \
00160      h2((ctx),(ctx->Y[(d)]),tem3);                  \
00161      (ctx->T[(u)]) = ((ctx->T[(u)]) + tem2+(tem0^tem1)) ^ tem3;     \
00162      (ctx->Y[(a)]) = (ctx->T[(u)]);                 \
00163 }     
00164 
00165 /*16 steps of HC-128, without generating keystream, */
00166 /*but use the outputs to update P and Q*/
00167 static void setup_update(HC128* ctx)  /*each time 16 steps*/
00168 {
00169    word32 cc,dd;
00170    cc = ctx->counter1024 & 0x1ff;
00171    dd = (cc+16)&0x1ff;
00172 
00173    if (ctx->counter1024 < 512)  
00174    {        
00175       ctx->counter1024 = (ctx->counter1024 + 16) & 0x3ff;
00176       update_P(ctx, cc+0, cc+1, 0, 6, 13, 4);
00177       update_P(ctx, cc+1, cc+2, 1, 7, 14, 5);
00178       update_P(ctx, cc+2, cc+3, 2, 8, 15, 6);
00179       update_P(ctx, cc+3, cc+4, 3, 9, 0,  7);
00180       update_P(ctx, cc+4, cc+5, 4, 10,1,  8);
00181       update_P(ctx, cc+5, cc+6, 5, 11,2,  9);
00182       update_P(ctx, cc+6, cc+7, 6, 12,3,  10);
00183       update_P(ctx, cc+7, cc+8, 7, 13,4,  11);
00184       update_P(ctx, cc+8, cc+9, 8, 14,5,  12);
00185       update_P(ctx, cc+9, cc+10,9, 15,6,  13);
00186       update_P(ctx, cc+10,cc+11,10,0, 7,  14);
00187       update_P(ctx, cc+11,cc+12,11,1, 8,  15);
00188       update_P(ctx, cc+12,cc+13,12,2, 9,  0);
00189       update_P(ctx, cc+13,cc+14,13,3, 10, 1);
00190       update_P(ctx, cc+14,cc+15,14,4, 11, 2);
00191       update_P(ctx, cc+15,dd+0, 15,5, 12, 3);   
00192    }
00193    else                 
00194    {
00195       ctx->counter1024 = (ctx->counter1024 + 16) & 0x3ff;
00196       update_Q(ctx, 512+cc+0, 512+cc+1, 0, 6, 13, 4);
00197       update_Q(ctx, 512+cc+1, 512+cc+2, 1, 7, 14, 5);
00198       update_Q(ctx, 512+cc+2, 512+cc+3, 2, 8, 15, 6);
00199       update_Q(ctx, 512+cc+3, 512+cc+4, 3, 9, 0,  7);
00200       update_Q(ctx, 512+cc+4, 512+cc+5, 4, 10,1,  8);
00201       update_Q(ctx, 512+cc+5, 512+cc+6, 5, 11,2,  9);
00202       update_Q(ctx, 512+cc+6, 512+cc+7, 6, 12,3,  10);
00203       update_Q(ctx, 512+cc+7, 512+cc+8, 7, 13,4,  11);
00204       update_Q(ctx, 512+cc+8, 512+cc+9, 8, 14,5,  12);
00205       update_Q(ctx, 512+cc+9, 512+cc+10,9, 15,6,  13);
00206       update_Q(ctx, 512+cc+10,512+cc+11,10,0, 7,  14);
00207       update_Q(ctx, 512+cc+11,512+cc+12,11,1, 8,  15);
00208       update_Q(ctx, 512+cc+12,512+cc+13,12,2, 9,  0);
00209       update_Q(ctx, 512+cc+13,512+cc+14,13,3, 10, 1);
00210       update_Q(ctx, 512+cc+14,512+cc+15,14,4, 11, 2);
00211       update_Q(ctx, 512+cc+15,512+dd+0, 15,5, 12, 3); 
00212    }       
00213 }
00214 
00215 
00216 /* for the 128-bit key:  key[0]...key[15]
00217 *  key[0] is the least significant byte of ctx->key[0] (K_0);
00218 *  key[3] is the most significant byte of ctx->key[0]  (K_0);
00219 *  ...
00220 *  key[12] is the least significant byte of ctx->key[3] (K_3)
00221 *  key[15] is the most significant byte of ctx->key[3]  (K_3)
00222 *
00223 *  for the 128-bit iv:  iv[0]...iv[15]
00224 *  iv[0] is the least significant byte of ctx->iv[0] (IV_0);
00225 *  iv[3] is the most significant byte of ctx->iv[0]  (IV_0);
00226 *  ...
00227 *  iv[12] is the least significant byte of ctx->iv[3] (IV_3)
00228 *  iv[15] is the most significant byte of ctx->iv[3]  (IV_3)
00229 */
00230 
00231 
00232 
00233 static void Hc128_SetIV(HC128* ctx, const byte* inIv)
00234 { 
00235     word32 i;
00236     word32 iv[4];
00237 
00238     if (inIv)
00239         XMEMCPY(iv, inIv, sizeof(iv));
00240     else
00241         XMEMSET(iv,    0, sizeof(iv));
00242     
00243     for (i = 0; i < (128 >> 5); i++)
00244         ctx->iv[i] = LITTLE32(iv[i]);
00245     
00246     for (; i < 8; i++) ctx->iv[i] = ctx->iv[i-4];
00247   
00248     /* expand the key and IV into the table T */ 
00249     /* (expand the key and IV into the table P and Q) */ 
00250     
00251     for (i = 0; i < 8;  i++)   ctx->T[i] = ctx->key[i];
00252     for (i = 8; i < 16; i++)   ctx->T[i] = ctx->iv[i-8];
00253 
00254     for (i = 16; i < (256+16); i++) 
00255         ctx->T[i] = f2(ctx->T[i-2]) + ctx->T[i-7] + f1(ctx->T[i-15]) +
00256                                                        ctx->T[i-16]+i;
00257     
00258     for (i = 0; i < 16;  i++)  ctx->T[i] = ctx->T[256+i];
00259 
00260     for (i = 16; i < 1024; i++) 
00261         ctx->T[i] = f2(ctx->T[i-2]) + ctx->T[i-7] + f1(ctx->T[i-15]) +
00262                                                        ctx->T[i-16]+256+i;
00263     
00264     /* initialize counter1024, X and Y */
00265     ctx->counter1024 = 0;
00266     for (i = 0; i < 16; i++) ctx->X[i] = ctx->T[512-16+i];
00267     for (i = 0; i < 16; i++) ctx->Y[i] = ctx->T[512+512-16+i];
00268     
00269     /* run the cipher 1024 steps before generating the output */
00270     for (i = 0; i < 64; i++)  setup_update(ctx);  
00271 }
00272 
00273 
00274 static INLINE int DoKey(HC128* ctx, const byte* key, const byte* iv)
00275 { 
00276   word32 i;  
00277 
00278   /* Key size in bits 128 */ 
00279   for (i = 0; i < (128 >> 5); i++)
00280       ctx->key[i] = LITTLE32(((word32*)key)[i]);
00281  
00282   for ( ; i < 8 ; i++) ctx->key[i] = ctx->key[i-4];
00283 
00284   Hc128_SetIV(ctx, iv);
00285 
00286   return 0;
00287 }
00288 
00289 
00290 /* Key setup */
00291 int wc_Hc128_SetKey(HC128* ctx, const byte* key, const byte* iv)
00292 {
00293 #ifdef XSTREAM_ALIGN
00294     if ((wolfssl_word)key % 4) {
00295         int alignKey[4];
00296 
00297         /* iv gets aligned in SetIV */
00298         WOLFSSL_MSG("Hc128SetKey unaligned key");
00299 
00300         XMEMCPY(alignKey, key, sizeof(alignKey));
00301 
00302         return DoKey(ctx, (const byte*)alignKey, iv);
00303     }
00304 #endif /* XSTREAM_ALIGN */
00305 
00306     return DoKey(ctx, key, iv);
00307 }
00308 
00309 
00310 
00311 /* The following defines the encryption of data stream */
00312 static INLINE int DoProcess(HC128* ctx, byte* output, const byte* input,
00313                             word32 msglen)
00314 {
00315   word32 i, keystream[16];
00316 
00317   for ( ; msglen >= 64; msglen -= 64, input += 64, output += 64)
00318   {
00319       generate_keystream(ctx, keystream);
00320 
00321       /* unroll loop */
00322       ((word32*)output)[0]  = ((word32*)input)[0]  ^ LITTLE32(keystream[0]);
00323       ((word32*)output)[1]  = ((word32*)input)[1]  ^ LITTLE32(keystream[1]);
00324       ((word32*)output)[2]  = ((word32*)input)[2]  ^ LITTLE32(keystream[2]);
00325       ((word32*)output)[3]  = ((word32*)input)[3]  ^ LITTLE32(keystream[3]);
00326       ((word32*)output)[4]  = ((word32*)input)[4]  ^ LITTLE32(keystream[4]);
00327       ((word32*)output)[5]  = ((word32*)input)[5]  ^ LITTLE32(keystream[5]);
00328       ((word32*)output)[6]  = ((word32*)input)[6]  ^ LITTLE32(keystream[6]);
00329       ((word32*)output)[7]  = ((word32*)input)[7]  ^ LITTLE32(keystream[7]);
00330       ((word32*)output)[8]  = ((word32*)input)[8]  ^ LITTLE32(keystream[8]);
00331       ((word32*)output)[9]  = ((word32*)input)[9]  ^ LITTLE32(keystream[9]);
00332       ((word32*)output)[10] = ((word32*)input)[10] ^ LITTLE32(keystream[10]);
00333       ((word32*)output)[11] = ((word32*)input)[11] ^ LITTLE32(keystream[11]);
00334       ((word32*)output)[12] = ((word32*)input)[12] ^ LITTLE32(keystream[12]);
00335       ((word32*)output)[13] = ((word32*)input)[13] ^ LITTLE32(keystream[13]);
00336       ((word32*)output)[14] = ((word32*)input)[14] ^ LITTLE32(keystream[14]);
00337       ((word32*)output)[15] = ((word32*)input)[15] ^ LITTLE32(keystream[15]);
00338   }
00339 
00340   if (msglen > 0)
00341   {
00342       XMEMSET(keystream, 0, sizeof(keystream)); /* hush the static analysis */
00343       generate_keystream(ctx, keystream);
00344 
00345 #ifdef BIG_ENDIAN_ORDER
00346       {
00347           word32 wordsLeft = msglen / sizeof(word32);
00348           if (msglen % sizeof(word32)) wordsLeft++;
00349           
00350           ByteReverseWords(keystream, keystream, wordsLeft * sizeof(word32));
00351       }
00352 #endif
00353 
00354       for (i = 0; i < msglen; i++)
00355           output[i] = input[i] ^ ((byte*)keystream)[i];
00356   }
00357 
00358   return 0;
00359 }
00360 
00361 
00362 /* Encrypt/decrypt a message of any size */
00363 int wc_Hc128_Process(HC128* ctx, byte* output, const byte* input, word32 msglen)
00364 {
00365 #ifdef XSTREAM_ALIGN
00366     if ((wolfssl_word)input % 4 || (wolfssl_word)output % 4) {
00367         #ifndef NO_WOLFSSL_ALLOC_ALIGN
00368             byte* tmp;
00369             WOLFSSL_MSG("Hc128Process unaligned");
00370 
00371             tmp = (byte*)XMALLOC(msglen, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00372             if (tmp == NULL) return MEMORY_E;
00373 
00374             XMEMCPY(tmp, input, msglen);
00375             DoProcess(ctx, tmp, tmp, msglen);
00376             XMEMCPY(output, tmp, msglen);
00377 
00378             XFREE(tmp, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00379 
00380             return 0;
00381         #else
00382             return BAD_ALIGN_E;
00383         #endif
00384     }
00385 #endif /* XSTREAM_ALIGN */
00386 
00387     return DoProcess(ctx, output, input, msglen);
00388 }
00389 
00390 
00391 #else  /* HAVE_HC128 */
00392 
00393 
00394 #ifdef _MSC_VER
00395     /* 4206 warning for blank file */
00396     #pragma warning(disable: 4206)
00397 #endif
00398 
00399 
00400 #endif /* HAVE_HC128 */
00401