crypto/md32_common.h

   1 /* crypto/md32_common.h */
   2 /* ====================================================================
   3  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the
  15  *    distribution.
  16  *
  17  * 3. All advertising materials mentioning features or use of this
  18  *    software must display the following acknowledgment:
  19  *    "This product includes software developed by the OpenSSL Project
  20  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  21  *
  22  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  23  *    endorse or promote products derived from this software without
  24  *    prior written permission. For written permission, please contact
  25  *    licensing@OpenSSL.org.
  26  *
  27  * 5. Products derived from this software may not be called "OpenSSL"
  28  *    nor may "OpenSSL" appear in their names without prior written
  29  *    permission of the OpenSSL Project.
  30  *
  31  * 6. Redistributions of any form whatsoever must retain the following
  32  *    acknowledgment:
  33  *    "This product includes software developed by the OpenSSL Project
  34  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  35  *
  36  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  37  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  38  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  39  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  42  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  43  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  44  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  45  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  46  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  47  * OF THE POSSIBILITY OF SUCH DAMAGE.
  48  * ====================================================================
  49  *
  50  * This product includes cryptographic software written by Eric Young
  51  * (eay@cryptsoft.com).  This product includes software written by Tim
  52  * Hudson (tjh@cryptsoft.com).
  53  *
  54  */
  55
  56 /*
  57  * This is a generic 32 bit "collector" for message digest algorithms.
  58  * Whenever needed it collects input character stream into chunks of
  59  * 32 bit values and invokes a block function that performs actual hash
  60  * calculations.
  61  *
  62  * Porting guide.
  63  *
  64  * Obligatory macros:
  65  *
  66  * DATA_ORDER_IS_BIG_ENDIAN or DATA_ORDER_IS_LITTLE_ENDIAN
  67  *      this macro defines byte order of input stream.
  68  * HASH_CBLOCK
  69  *      size of a unit chunk HASH_BLOCK operates on.
  70  * HASH_LONG
  71  *      has to be at lest 32 bit wide, if it's wider, then
  72  *      HASH_LONG_LOG2 *has to* be defined along
  73  * HASH_CTX
  74  *      context structure that at least contains following
  75  *      members:
  76  *              typedef struct {
  77  *                      ...
  78  *                      HASH_LONG       Nl,Nh;
  79  *                      HASH_LONG       data[HASH_LBLOCK];
  80  *                      int             num;
  81  *                      ...
  82  *                      } HASH_CTX;
  83  * HASH_UPDATE
  84  *      name of "Update" function, implemented here.
  85  * HASH_TRANSFORM
  86  *      name of "Transform" function, implemented here.
  87  * HASH_FINAL
  88  *      name of "Final" function, implemented here.
  89  * HASH_BLOCK_HOST_ORDER
  90  *      name of "block" function treating *aligned* input message
  91  *      in host byte order, implemented externally.
  92  * HASH_BLOCK_DATA_ORDER
  93  *      name of "block" function treating *unaligned* input message
  94  *      in original (data) byte order, implemented externally (it
  95  *      actually is optional if data and host are of the same
  96  *      "endianess").
  97  * HASH_MAKE_STRING
  98  *      macro convering context variables to an ASCII hash string.
  99  *
 100  * Optional macros:
 101  *
 102  * B_ENDIAN or L_ENDIAN
 103  *      defines host byte-order.
 104  * HASH_LONG_LOG2
 105  *      defaults to 2 if not states otherwise.
 106  * HASH_LBLOCK
 107  *      assumed to be HASH_CBLOCK/4 if not stated otherwise.
 108  * HASH_BLOCK_DATA_ORDER_ALIGNED
 109  *      alternative "block" function capable of treating
 110  *      aligned input message in original (data) order,
 111  *      implemented externally.
 112  *
 113  * MD5 example:
 114  *
 115  *      #define DATA_ORDER_IS_LITTLE_ENDIAN
 116  *
 117  *      #define HASH_LONG               MD5_LONG
 118  *      #define HASH_LONG_LOG2          MD5_LONG_LOG2
 119  *      #define HASH_CTX                MD5_CTX
 120  *      #define HASH_CBLOCK             MD5_CBLOCK
 121  *      #define HASH_LBLOCK             MD5_LBLOCK
 122  *      #define HASH_UPDATE             MD5_Update
 123  *      #define HASH_TRANSFORM          MD5_Transform
 124  *      #define HASH_FINAL              MD5_Final
 125  *      #define HASH_BLOCK_HOST_ORDER   md5_block_host_order
 126  *      #define HASH_BLOCK_DATA_ORDER   md5_block_data_order
 127  *
 128  *                                      <appro@fy.chalmers.se>
 129  */
 130
 131 #if !defined(DATA_ORDER_IS_BIG_ENDIAN) && !defined(DATA_ORDER_IS_LITTLE_ENDIAN)
 132 #error "DATA_ORDER must be defined!"
 133 #endif
 134
 135 #ifndef HASH_CBLOCK
 136 #error "HASH_CBLOCK must be defined!"
 137 #endif
 138 #ifndef HASH_LONG
 139 #error "HASH_LONG must be defined!"
 140 #endif
 141 #ifndef HASH_CTX
 142 #error "HASH_CTX must be defined!"
 143 #endif
 144
 145 #ifndef HASH_UPDATE
 146 #error "HASH_UPDATE must be defined!"
 147 #endif
 148 #ifndef HASH_TRANSFORM
 149 #error "HASH_TRANSFORM must be defined!"
 150 #endif
 151 #ifndef HASH_FINAL
 152 #error "HASH_FINAL must be defined!"
 153 #endif
 154
 155 #ifndef HASH_BLOCK_HOST_ORDER
 156 #error "HASH_BLOCK_HOST_ORDER must be defined!"
 157 #endif
 158
 159 #if 0
 160 /*
 161  * Moved below as it's required only if HASH_BLOCK_DATA_ORDER_ALIGNED
 162  * isn't defined.
 163  */
 164 #ifndef HASH_BLOCK_DATA_ORDER
 165 #error "HASH_BLOCK_DATA_ORDER must be defined!"
 166 #endif
 167 #endif
 168
 169 #ifndef HASH_LBLOCK
 170 #define HASH_LBLOCK     (HASH_CBLOCK/4)
 171 #endif
 172
 173 #ifndef HASH_LONG_LOG2
 174 #define HASH_LONG_LOG2  2
 175 #endif
 176
 177 /*
 178  * Engage compiler specific rotate intrinsic function if available.
 179  */
 180 #undef ROTATE
 181 #ifndef PEDANTIC
 182 # if defined(_MSC_VER)
 183 #  define ROTATE(a,n)   _lrotl(a,n)
 184 # elif defined(__MWERKS__)
 185 #  ifdef __POWERPC__
 186 #   define ROTATE(a,n)  __rlwinm(a,n,0,31)
 187 #  else
 188 #   define ROTATE(a,n)  __rol(a,n)
 189 #  endif
 190 # elif defined(__GNUC__) && __GNUC__>=2 && !defined(NO_ASM)
 191   /*
 192    * Some GNU C inline assembler templates. Note that these are
 193    * rotates by *constant* number of bits! But that's exactly
 194    * what we need here...
 195    *
 196    *                                    <appro@fy.chalmers.se>
 197    */
 198 #  if defined(__i386)
 199 #   define ROTATE(a,n)  ({ register unsigned int ret;   \
 200                                 asm volatile (          \
 201                                 "roll %1,%0"            \
 202                                 : "=r"(ret)             \
 203                                 : "I"(n), "0"(a)        \
 204                                 : "cc");                \
 205                            ret;                         \
 206                         })
 207 #  elif defined(__powerpc)
 208 #   define ROTATE(a,n)  ({ register unsigned int ret;   \
 209                                 asm volatile (          \
 210                                 "rlwinm %0,%1,%2,0,31"  \
 211                                 : "=r"(ret)             \
 212                                 : "r"(a), "I"(n));      \
 213                            ret;                         \
 214                         })
 215 #  endif
 216 # endif
 217
 218 /*
 219  * Engage compiler specific "fetch in reverse byte order"
 220  * intrinsic function if available.
 221  */
 222 # if defined(__GNUC__) && __GNUC__>=2 && !defined(NO_ASM)
 223   /* some GNU C inline assembler templates by <appro@fy.chalmers.se> */
 224 #  if defined(__i386) && !defined(I386_ONLY)
 225 #   define BE_FETCH32(a)        ({ register unsigned int l=(a);\
 226                                 asm volatile (          \
 227                                 "bswapl %0"             \
 228                                 : "=r"(l) : "0"(l));    \
 229                           l;                            \
 230                         })
 231 #  elif defined(__powerpc)
 232 #   define LE_FETCH32(a)        ({ register unsigned int l;     \
 233                                 asm volatile (          \
 234                                 "lwbrx %0,0,%1"         \
 235                                 : "=r"(l)               \
 236                                 : "r"(a));              \
 237                            l;                           \
 238                         })
 239
 240 #  elif defined(__sparc) && defined(ULTRASPARC)
 241 #  define LE_FETCH32(a) ({ register unsigned int l;             \
 242                                 asm volatile (                  \
 243                                 "lda [%1]#ASI_PRIMARY_LITTLE,%0"\
 244                                 : "=r"(l)                       \
 245                                 : "r"(a));                      \
 246                            l;                                   \
 247                         })
 248 #  endif
 249 # endif
 250 #endif /* PEDANTIC */
 251
 252 #if HASH_LONG_LOG2==2   /* Engage only if sizeof(HASH_LONG)== 4 */
 253 /* A nice byte order reversal from Wei Dai <weidai@eskimo.com> */
 254 #ifdef ROTATE
 255 /* 5 instructions with rotate instruction, else 9 */
 256 #define REVERSE_FETCH32(a,l)    (                                       \
 257                 l=*(const HASH_LONG *)(a),                              \
 258                 ((ROTATE(l,8)&0x00FF00FF)|(ROTATE((l&0x00FF00FF),24)))  \
 259                                 )
 260 #else
 261 /* 6 instructions with rotate instruction, else 8 */
 262 #define REVERSE_FETCH32(a,l)    (                               \
 263                 l=*(const HASH_LONG *)(a),                      \
 264                 l=(((l>>8)&0x00FF00FF)|((l&0x00FF00FF)<<8)),    \
 265                 ROTATE(l,16)                                    \
 266                                 )
 267 /*
 268  * Originally the middle line started with l=(((l&0xFF00FF00)>>8)|...
 269  * It's rewritten as above for two reasons:
 270  *      - RISCs aren't good at long constants and have to explicitely
 271  *        compose 'em with several (well, usually 2) instructions in a
 272  *        register before performing the actual operation and (as you
 273  *        already realized:-) having same constant should inspire the
 274  *        compiler to permanently allocate the only register for it;
 275  *      - most modern CPUs have two ALUs, but usually only one has
 276  *        circuitry for shifts:-( this minor tweak inspires compiler
 277  *        to schedule shift instructions in a better way...
 278  *
 279  *                              <appro@fy.chalmers.se>
 280  */
 281 #endif
 282 #endif
 283
 284 #ifndef ROTATE
 285 #define ROTATE(a,n)     (((a)<<(n))|(((a)&0xffffffff)>>(32-(n))))
 286 #endif
 287
 288 /*
 289  * Make some obvious choices. E.g., HASH_BLOCK_DATA_ORDER_ALIGNED
 290  * and HASH_BLOCK_HOST_ORDER ought to be the same if input data
 291  * and host are of the same "endianess". It's possible to mask
 292  * this with blank #define HASH_BLOCK_DATA_ORDER though...
 293  *
 294  *                              <appro@fy.chalmers.se>
 295  */
 296 #if defined(B_ENDIAN)
 297 #  if defined(DATA_ORDER_IS_BIG_ENDIAN)
 298 #    if !defined(HASH_BLOCK_DATA_ORDER_ALIGNED) && HASH_LONG_LOG2==2
 299 #      define HASH_BLOCK_DATA_ORDER_ALIGNED     HASH_BLOCK_HOST_ORDER
 300 #    endif
 301 #  elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
 302 #    ifndef HOST_FETCH32
 303 #      ifdef LE_FETCH32
 304 #        define HOST_FETCH32(p,l)       LE_FETCH32(p)
 305 #      elif defined(REVERSE_FETCH32)
 306 #        define HOST_FETCH32(p,l)       REVERSE_FETCH32(p,l)
 307 #      endif
 308 #    endif
 309 #  endif
 310 #elif defined(L_ENDIAN)
 311 #  if defined(DATA_ORDER_IS_LITTLE_ENDIAN)
 312 #    if !defined(HASH_BLOCK_DATA_ORDER_ALIGNED) && HASH_LONG_LOG2==2
 313 #      define HASH_BLOCK_DATA_ORDER_ALIGNED     HASH_BLOCK_HOST_ORDER
 314 #    endif
 315 #  elif defined(DATA_ORDER_IS_BIG_ENDIAN)
 316 #    ifndef HOST_FETCH32
 317 #      ifdef BE_FETCH32
 318 #        define HOST_FETCH32(p,l)       BE_FETCH32(p)
 319 #      elif defined(REVERSE_FETCH32)
 320 #        define HOST_FETCH32(p,l)       REVERSE_FETCH32(p,l)
 321 #      endif
 322 #    endif
 323 #  endif
 324 #endif
 325
 326 #if !defined(HASH_BLOCK_DATA_ORDER_ALIGNED)
 327 #ifndef HASH_BLOCK_DATA_ORDER
 328 #error "HASH_BLOCK_DATA_ORDER must be defined!"
 329 #endif
 330 #endif
 331
 332 #if defined(DATA_ORDER_IS_BIG_ENDIAN)
 333
 334 #define HOST_c2l(c,l)   (l =(((unsigned long)(*((c)++)))<<24),          \
 335                          l|=(((unsigned long)(*((c)++)))<<16),          \
 336                          l|=(((unsigned long)(*((c)++)))<< 8),          \
 337                          l|=(((unsigned long)(*((c)++)))    ),          \
 338                          l)
 339 #define HOST_p_c2l(c,l,n)       {                                       \
 340                         switch (n) {                                    \
 341                         case 0: l =((unsigned long)(*((c)++)))<<24;     \
 342                         case 1: l|=((unsigned long)(*((c)++)))<<16;     \
 343                         case 2: l|=((unsigned long)(*((c)++)))<< 8;     \
 344                         case 3: l|=((unsigned long)(*((c)++)));         \
 345                                 } }
 346 #define HOST_p_c2l_p(c,l,sc,len) {                                      \
 347                         switch (sc) {                                   \
 348                         case 0: l =((unsigned long)(*((c)++)))<<24;     \
 349                                 if (--len == 0) break;                  \
 350                         case 1: l|=((unsigned long)(*((c)++)))<<16;     \
 351                                 if (--len == 0) break;                  \
 352                         case 2: l|=((unsigned long)(*((c)++)))<< 8;     \
 353                                 } }
 354 /* NOTE the pointer is not incremented at the end of this */
 355 #define HOST_c2l_p(c,l,n)       {                                       \
 356                         l=0; (c)+=n;                                    \
 357                         switch (n) {                                    \
 358                         case 3: l =((unsigned long)(*(--(c))))<< 8;     \
 359                         case 2: l|=((unsigned long)(*(--(c))))<<16;     \
 360                         case 1: l|=((unsigned long)(*(--(c))))<<24;     \
 361                                 } }
 362 #define HOST_l2c(l,c)   (*((c)++)=(unsigned char)(((l)>>24)&0xff),      \
 363                          *((c)++)=(unsigned char)(((l)>>16)&0xff),      \
 364                          *((c)++)=(unsigned char)(((l)>> 8)&0xff),      \
 365                          *((c)++)=(unsigned char)(((l)    )&0xff),      \
 366                          l)
 367
 368 #elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
 369
 370 #define HOST_c2l(c,l)   (l =(((unsigned long)(*((c)++)))    ),          \
 371                          l|=(((unsigned long)(*((c)++)))<< 8),          \
 372                          l|=(((unsigned long)(*((c)++)))<<16),          \
 373                          l|=(((unsigned long)(*((c)++)))<<24),          \
 374                          l)
 375 #define HOST_p_c2l(c,l,n)       {                                       \
 376                         switch (n) {                                    \
 377                         case 0: l =((unsigned long)(*((c)++)));         \
 378                         case 1: l|=((unsigned long)(*((c)++)))<< 8;     \
 379                         case 2: l|=((unsigned long)(*((c)++)))<<16;     \
 380                         case 3: l|=((unsigned long)(*((c)++)))<<24;     \
 381                                 } }
 382 #define HOST_p_c2l_p(c,l,sc,len) {                                      \
 383                         switch (sc) {                                   \
 384                         case 0: l =((unsigned long)(*((c)++)));         \
 385                                 if (--len == 0) break;                  \
 386                         case 1: l|=((unsigned long)(*((c)++)))<< 8;     \
 387                                 if (--len == 0) break;                  \
 388                         case 2: l|=((unsigned long)(*((c)++)))<<16;     \
 389                                 } }
 390 /* NOTE the pointer is not incremented at the end of this */
 391 #define HOST_c2l_p(c,l,n)       {                                       \
 392                         l=0; (c)+=n;                                    \
 393                         switch (n) {                                    \
 394                         case 3: l =((unsigned long)(*(--(c))))<<16;     \
 395                         case 2: l|=((unsigned long)(*(--(c))))<< 8;     \
 396                         case 1: l|=((unsigned long)(*(--(c))));         \
 397                                 } }
 398 #define HOST_l2c(l,c)   (*((c)++)=(unsigned char)(((l)    )&0xff),      \
 399                          *((c)++)=(unsigned char)(((l)>> 8)&0xff),      \
 400                          *((c)++)=(unsigned char)(((l)>>16)&0xff),      \
 401                          *((c)++)=(unsigned char)(((l)>>24)&0xff),      \
 402                          l)
 403
 404 #endif
 405
 406 /*
 407  * Time for some action:-)
 408  */
 409
 410 void HASH_UPDATE (HASH_CTX *c, const unsigned char *data, unsigned long len)
 411         {
 412         register HASH_LONG * p;
 413         register unsigned long l;
 414         int sw,sc,ew,ec;
 415
 416         if (len==0) return;
 417
 418         l=(c->Nl+(len<<3))&0xffffffffL;
 419         /* 95-05-24 eay Fixed a bug with the overflow handling, thanks to
 420          * Wei Dai <weidai@eskimo.com> for pointing it out. */
 421         if (l < c->Nl) /* overflow */
 422                 c->Nh++;
 423         c->Nh+=(len>>29);
 424         c->Nl=l;
 425
 426         if (c->num != 0)
 427                 {
 428                 p=c->data;
 429                 sw=c->num>>2;
 430                 sc=c->num&0x03;
 431
 432                 if ((c->num+len) >= HASH_CBLOCK)
 433                         {
 434                         l=p[sw]; HOST_p_c2l(data,l,sc); p[sw++]=l;
 435                         for (; sw<HASH_LBLOCK; sw++)
 436                                 {
 437                                 HOST_c2l(data,l); p[sw]=l;
 438                                 }
 439                         HASH_BLOCK_HOST_ORDER (c,p,1);
 440                         len-=(HASH_CBLOCK-c->num);
 441                         c->num=0;
 442                         /* drop through and do the rest */
 443                         }
 444                 else
 445                         {
 446                         c->num+=len;
 447                         if ((sc+len) < 4) /* ugly, add char's to a word */
 448                                 {
 449                                 l=p[sw]; HOST_p_c2l_p(data,l,sc,len); p[sw]=l;
 450                                 }
 451                         else
 452                                 {
 453                                 ew=(c->num>>2);
 454                                 ec=(c->num&0x03);
 455                                 l=p[sw]; HOST_p_c2l(data,l,sc); p[sw++]=l;
 456                                 for (; sw < ew; sw++)
 457                                         {
 458                                         HOST_c2l(data,l); p[sw]=l;
 459                                         }
 460                                 if (ec)
 461                                         {
 462                                         HOST_c2l_p(data,l,ec); p[sw]=l;
 463                                         }
 464                                 }
 465                         return;
 466                         }
 467                 }
 468
 469         sw=len/HASH_CBLOCK;
 470         if (sw > 0)
 471                 {
 472 #if defined(HASH_BLOCK_DATA_ORDER_ALIGNED)
 473                 /*
 474                  * Note that HASH_BLOCK_DATA_ORDER_ALIGNED gets defined
 475                  * only if sizeof(HASH_LONG)==4.
 476                  */
 477                 if ((((unsigned long)data)%4) == 0)
 478                         {
 479                         /* data is properly aligned so that we can cast it: */
 480                         HASH_BLOCK_DATA_ORDER_ALIGNED (c,(HASH_LONG *)data,sw);
 481                         sw*=HASH_CBLOCK;
 482                         data+=sw;
 483                         len-=sw;
 484                         }
 485                 else
 486 #if !defined(HASH_BLOCK_DATA_ORDER)
 487                         while (sw--)
 488                                 {
 489                                 memcpy (p=c->data,data,HASH_CBLOCK);
 490                                 HASH_BLOCK_DATA_ORDER_ALIGNED(c,p,1);
 491                                 data+=HASH_CBLOCK;
 492                                 len-=HASH_CBLOCK;
 493                                 }
 494 #endif
 495 #endif
 496 #if defined(HASH_BLOCK_DATA_ORDER)
 497                         {
 498                         HASH_BLOCK_DATA_ORDER(c,data,sw);
 499                         sw*=HASH_CBLOCK;
 500                         data+=sw;
 501                         len-=sw;
 502                         }
 503 #endif
 504                 }
 505
 506         if (len!=0)
 507                 {
 508                 p = c->data;
 509                 c->num = len;
 510                 ew=len>>2;      /* words to copy */
 511                 ec=len&0x03;
 512                 for (; ew; ew--,p++)
 513                         {
 514                         HOST_c2l(data,l); *p=l;
 515                         }
 516                 HOST_c2l_p(data,l,ec);
 517                 *p=l;
 518                 }
 519         }
 520
 521
 522 void HASH_TRANSFORM (HASH_CTX *c, const unsigned char *data)
 523         {
 524 #if defined(HASH_BLOCK_DATA_ORDER_ALIGNED)
 525         if ((((unsigned long)data)%4) == 0)
 526                 /* data is properly aligned so that we can cast it: */
 527                 HASH_BLOCK_DATA_ORDER_ALIGNED (c,(HASH_LONG *)data,1);
 528         else
 529 #if !defined(HASH_BLOCK_DATA_ORDER)
 530                 {
 531                 memcpy (c->data,data,HASH_CBLOCK);
 532                 HASH_BLOCK_DATA_ORDER_ALIGNED (c,c->data,1);
 533                 }
 534 #endif
 535 #endif
 536 #if defined(HASH_BLOCK_DATA_ORDER)
 537         HASH_BLOCK_DATA_ORDER (c,data,1);
 538 #endif
 539         }
 540
 541
 542 void HASH_FINAL (unsigned char *md, HASH_CTX *c)
 543         {
 544         register HASH_LONG *p;
 545         register unsigned long l;
 546         register int i,j;
 547         static const unsigned char end[4]={0x80,0x00,0x00,0x00};
 548         const unsigned char *cp=end;
 549
 550         /* c->num should definitly have room for at least one more byte. */
 551         p=c->data;
 552         i=c->num>>2;
 553         j=c->num&0x03;
 554
 555 #if 0
 556         /* purify often complains about the following line as an
 557          * Uninitialized Memory Read.  While this can be true, the
 558          * following p_c2l macro will reset l when that case is true.
 559          * This is because j&0x03 contains the number of 'valid' bytes
 560          * already in p[i].  If and only if j&0x03 == 0, the UMR will
 561          * occur but this is also the only time p_c2l will do
 562          * l= *(cp++) instead of l|= *(cp++)
 563          * Many thanks to Alex Tang <altitude@cic.net> for pickup this
 564          * 'potential bug' */
 565 #ifdef PURIFY
 566         if (j==0) p[i]=0; /* Yeah, but that's not the way to fix it:-) */
 567 #endif
 568         l=p[i];
 569 #else
 570         l = (j==0) ? 0 : p[i];
 571 #endif
 572         HOST_p_c2l(cp,l,j); p[i++]=l; /* i is the next 'undefined word' */
 573
 574         if (i>(HASH_LBLOCK-2)) /* save room for Nl and Nh */
 575                 {
 576                 if (i<HASH_LBLOCK) p[i]=0;
 577                 HASH_BLOCK_HOST_ORDER (c,p,1);
 578                 i=0;
 579                 }
 580         for (; i<(HASH_LBLOCK-2); i++)
 581                 p[i]=0;
 582
 583 #if   defined(DATA_ORDER_IS_BIG_ENDIAN)
 584         p[HASH_LBLOCK-2]=c->Nh;
 585         p[HASH_LBLOCK-1]=c->Nl;
 586 #elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
 587         p[HASH_LBLOCK-2]=c->Nl;
 588         p[HASH_LBLOCK-1]=c->Nh;
 589 #endif
 590         HASH_BLOCK_HOST_ORDER (c,p,1);
 591
 592 #ifndef HASH_MAKE_STRING
 593 #error "HASH_MAKE_STRING must be defined!"
 594 #else
 595         HASH_MAKE_STRING(c,md);
 596 #endif
 597
 598         c->num=0;
 599         /* clear stuff, HASH_BLOCK may be leaving some stuff on the stack
 600          * but I'm not worried :-)
 601         memset((void *)c,0,sizeof(HASH_CTX));
 602          */
 603         }