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 0 /* defined(_MSC_VER) */
 183 #  define ROTATE(a,n)   _lrotl(a,n)
 184 # elif defined(__MWERKS__)
 185 #  if defined(__POWERPC__)
 186 #   define ROTATE(a,n)  __rlwinm(a,n,0,31)
 187 #  elif defined(__MC68K__)
 188     /* Motorola specific tweak. <appro@fy.chalmers.se> */
 189 #   define ROTATE(a,n)  ( n<24 ? __rol(a,n) : __ror(a,32-n) )
 190 #  else
 191 #   define ROTATE(a,n)  __rol(a,n)
 192 #  endif
 193 # elif defined(__GNUC__) && __GNUC__>=2 && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM)
 194   /*
 195    * Some GNU C inline assembler templates. Note that these are
 196    * rotates by *constant* number of bits! But that's exactly
 197    * what we need here...
 198    *
 199    *                                    <appro@fy.chalmers.se>
 200    */
 201 #  if defined(__i386)
 202 #   define ROTATE(a,n)  ({ register unsigned int ret;   \
 203                                 asm (                   \
 204                                 "roll %1,%0"            \
 205                                 : "=r"(ret)             \
 206                                 : "I"(n), "0"(a)        \
 207                                 : "cc");                \
 208                            ret;                         \
 209                         })
 210 #  elif defined(__powerpc) || defined(__ppc)
 211 #   define ROTATE(a,n)  ({ register unsigned int ret;   \
 212                                 asm (                   \
 213                                 "rlwinm %0,%1,%2,0,31"  \
 214                                 : "=r"(ret)             \
 215                                 : "r"(a), "I"(n));      \
 216                            ret;                         \
 217                         })
 218 #  endif
 219 # endif
 220
 221 /*
 222  * Engage compiler specific "fetch in reverse byte order"
 223  * intrinsic function if available.
 224  */
 225 # if defined(__GNUC__) && __GNUC__>=2 && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM)
 226   /* some GNU C inline assembler templates by <appro@fy.chalmers.se> */
 227 #  if defined(__i386) && !defined(I386_ONLY)
 228 #   define BE_FETCH32(a)        ({ register unsigned int l=(a);\
 229                                 asm (                   \
 230                                 "bswapl %0"             \
 231                                 : "=r"(l) : "0"(l));    \
 232                           l;                            \
 233                         })
 234 #  elif defined(__powerpc)
 235 #   define LE_FETCH32(a)        ({ register unsigned int l;     \
 236                                 asm (                   \
 237                                 "lwbrx %0,0,%1"         \
 238                                 : "=r"(l)               \
 239                                 : "r"(a));              \
 240                            l;                           \
 241                         })
 242
 243 #  elif defined(__sparc) && defined(OPENSSL_SYS_ULTRASPARC)
 244 #  define LE_FETCH32(a) ({ register unsigned int l;             \
 245                                 asm (                           \
 246                                 "lda [%1]#ASI_PRIMARY_LITTLE,%0"\
 247                                 : "=r"(l)                       \
 248                                 : "r"(a));                      \
 249                            l;                                   \
 250                         })
 251 #  endif
 252 # endif
 253 #endif /* PEDANTIC */
 254
 255 #if HASH_LONG_LOG2==2   /* Engage only if sizeof(HASH_LONG)== 4 */
 256 /* A nice byte order reversal from Wei Dai <weidai@eskimo.com> */
 257 #ifdef ROTATE
 258 /* 5 instructions with rotate instruction, else 9 */
 259 #define REVERSE_FETCH32(a,l)    (                                       \
 260                 l=*(const HASH_LONG *)(a),                              \
 261                 ((ROTATE(l,8)&0x00FF00FF)|(ROTATE((l&0x00FF00FF),24)))  \
 262                                 )
 263 #else
 264 /* 6 instructions with rotate instruction, else 8 */
 265 #define REVERSE_FETCH32(a,l)    (                               \
 266                 l=*(const HASH_LONG *)(a),                      \
 267                 l=(((l>>8)&0x00FF00FF)|((l&0x00FF00FF)<<8)),    \
 268                 ROTATE(l,16)                                    \
 269                                 )
 270 /*
 271  * Originally the middle line started with l=(((l&0xFF00FF00)>>8)|...
 272  * It's rewritten as above for two reasons:
 273  *      - RISCs aren't good at long constants and have to explicitely
 274  *        compose 'em with several (well, usually 2) instructions in a
 275  *        register before performing the actual operation and (as you
 276  *        already realized:-) having same constant should inspire the
 277  *        compiler to permanently allocate the only register for it;
 278  *      - most modern CPUs have two ALUs, but usually only one has
 279  *        circuitry for shifts:-( this minor tweak inspires compiler
 280  *        to schedule shift instructions in a better way...
 281  *
 282  *                              <appro@fy.chalmers.se>
 283  */
 284 #endif
 285 #endif
 286
 287 #ifndef ROTATE
 288 #define ROTATE(a,n)     (((a)<<(n))|(((a)&0xffffffff)>>(32-(n))))
 289 #endif
 290
 291 /*
 292  * Make some obvious choices. E.g., HASH_BLOCK_DATA_ORDER_ALIGNED
 293  * and HASH_BLOCK_HOST_ORDER ought to be the same if input data
 294  * and host are of the same "endianess". It's possible to mask
 295  * this with blank #define HASH_BLOCK_DATA_ORDER though...
 296  *
 297  *                              <appro@fy.chalmers.se>
 298  */
 299 #if defined(B_ENDIAN)
 300 #  if defined(DATA_ORDER_IS_BIG_ENDIAN)
 301 #    if !defined(HASH_BLOCK_DATA_ORDER_ALIGNED) && HASH_LONG_LOG2==2
 302 #      define HASH_BLOCK_DATA_ORDER_ALIGNED     HASH_BLOCK_HOST_ORDER
 303 #    endif
 304 #  elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
 305 #    ifndef HOST_FETCH32
 306 #      ifdef LE_FETCH32
 307 #        define HOST_FETCH32(p,l)       LE_FETCH32(p)
 308 #      elif defined(REVERSE_FETCH32)
 309 #        define HOST_FETCH32(p,l)       REVERSE_FETCH32(p,l)
 310 #      endif
 311 #    endif
 312 #  endif
 313 #elif defined(L_ENDIAN)
 314 #  if defined(DATA_ORDER_IS_LITTLE_ENDIAN)
 315 #    if !defined(HASH_BLOCK_DATA_ORDER_ALIGNED) && HASH_LONG_LOG2==2
 316 #      define HASH_BLOCK_DATA_ORDER_ALIGNED     HASH_BLOCK_HOST_ORDER
 317 #    endif
 318 #  elif defined(DATA_ORDER_IS_BIG_ENDIAN)
 319 #    ifndef HOST_FETCH32
 320 #      ifdef BE_FETCH32
 321 #        define HOST_FETCH32(p,l)       BE_FETCH32(p)
 322 #      elif defined(REVERSE_FETCH32)
 323 #        define HOST_FETCH32(p,l)       REVERSE_FETCH32(p,l)
 324 #      endif
 325 #    endif
 326 #  endif
 327 #endif
 328
 329 #if !defined(HASH_BLOCK_DATA_ORDER_ALIGNED)
 330 #ifndef HASH_BLOCK_DATA_ORDER
 331 #error "HASH_BLOCK_DATA_ORDER must be defined!"
 332 #endif
 333 #endif
 334
 335 #if defined(DATA_ORDER_IS_BIG_ENDIAN)
 336
 337 #define HOST_c2l(c,l)   (l =(((unsigned long)(*((c)++)))<<24),          \
 338                          l|=(((unsigned long)(*((c)++)))<<16),          \
 339                          l|=(((unsigned long)(*((c)++)))<< 8),          \
 340                          l|=(((unsigned long)(*((c)++)))    ),          \
 341                          l)
 342 #define HOST_p_c2l(c,l,n)       {                                       \
 343                         switch (n) {                                    \
 344                         case 0: l =((unsigned long)(*((c)++)))<<24;     \
 345                         case 1: l|=((unsigned long)(*((c)++)))<<16;     \
 346                         case 2: l|=((unsigned long)(*((c)++)))<< 8;     \
 347                         case 3: l|=((unsigned long)(*((c)++)));         \
 348                                 } }
 349 #define HOST_p_c2l_p(c,l,sc,len) {                                      \
 350                         switch (sc) {                                   \
 351                         case 0: l =((unsigned long)(*((c)++)))<<24;     \
 352                                 if (--len == 0) break;                  \
 353                         case 1: l|=((unsigned long)(*((c)++)))<<16;     \
 354                                 if (--len == 0) break;                  \
 355                         case 2: l|=((unsigned long)(*((c)++)))<< 8;     \
 356                                 } }
 357 /* NOTE the pointer is not incremented at the end of this */
 358 #define HOST_c2l_p(c,l,n)       {                                       \
 359                         l=0; (c)+=n;                                    \
 360                         switch (n) {                                    \
 361                         case 3: l =((unsigned long)(*(--(c))))<< 8;     \
 362                         case 2: l|=((unsigned long)(*(--(c))))<<16;     \
 363                         case 1: l|=((unsigned long)(*(--(c))))<<24;     \
 364                                 } }
 365 #define HOST_l2c(l,c)   (*((c)++)=(unsigned char)(((l)>>24)&0xff),      \
 366                          *((c)++)=(unsigned char)(((l)>>16)&0xff),      \
 367                          *((c)++)=(unsigned char)(((l)>> 8)&0xff),      \
 368                          *((c)++)=(unsigned char)(((l)    )&0xff),      \
 369                          l)
 370
 371 #elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
 372
 373 #define HOST_c2l(c,l)   (l =(((unsigned long)(*((c)++)))    ),          \
 374                          l|=(((unsigned long)(*((c)++)))<< 8),          \
 375                          l|=(((unsigned long)(*((c)++)))<<16),          \
 376                          l|=(((unsigned long)(*((c)++)))<<24),          \
 377                          l)
 378 #define HOST_p_c2l(c,l,n)       {                                       \
 379                         switch (n) {                                    \
 380                         case 0: l =((unsigned long)(*((c)++)));         \
 381                         case 1: l|=((unsigned long)(*((c)++)))<< 8;     \
 382                         case 2: l|=((unsigned long)(*((c)++)))<<16;     \
 383                         case 3: l|=((unsigned long)(*((c)++)))<<24;     \
 384                                 } }
 385 #define HOST_p_c2l_p(c,l,sc,len) {                                      \
 386                         switch (sc) {                                   \
 387                         case 0: l =((unsigned long)(*((c)++)));         \
 388                                 if (--len == 0) break;                  \
 389                         case 1: l|=((unsigned long)(*((c)++)))<< 8;     \
 390                                 if (--len == 0) break;                  \
 391                         case 2: l|=((unsigned long)(*((c)++)))<<16;     \
 392                                 } }
 393 /* NOTE the pointer is not incremented at the end of this */
 394 #define HOST_c2l_p(c,l,n)       {                                       \
 395                         l=0; (c)+=n;                                    \
 396                         switch (n) {                                    \
 397                         case 3: l =((unsigned long)(*(--(c))))<<16;     \
 398                         case 2: l|=((unsigned long)(*(--(c))))<< 8;     \
 399                         case 1: l|=((unsigned long)(*(--(c))));         \
 400                                 } }
 401 #define HOST_l2c(l,c)   (*((c)++)=(unsigned char)(((l)    )&0xff),      \
 402                          *((c)++)=(unsigned char)(((l)>> 8)&0xff),      \
 403                          *((c)++)=(unsigned char)(((l)>>16)&0xff),      \
 404                          *((c)++)=(unsigned char)(((l)>>24)&0xff),      \
 405                          l)
 406
 407 #endif
 408
 409 /*
 410  * Time for some action:-)
 411  */
 412
 413 void HASH_UPDATE (HASH_CTX *c, const void *data_, unsigned long len)
 414         {
 415         const unsigned char *data=data_;
 416         register HASH_LONG * p;
 417         register unsigned long l;
 418         int sw,sc,ew,ec;
 419
 420         if (len==0) return;
 421
 422         l=(c->Nl+(len<<3))&0xffffffffL;
 423         /* 95-05-24 eay Fixed a bug with the overflow handling, thanks to
 424          * Wei Dai <weidai@eskimo.com> for pointing it out. */
 425         if (l < c->Nl) /* overflow */
 426                 c->Nh++;
 427         c->Nh+=(len>>29);
 428         c->Nl=l;
 429
 430         if (c->num != 0)
 431                 {
 432                 p=c->data;
 433                 sw=c->num>>2;
 434                 sc=c->num&0x03;
 435
 436                 if ((c->num+len) >= HASH_CBLOCK)
 437                         {
 438                         l=p[sw]; HOST_p_c2l(data,l,sc); p[sw++]=l;
 439                         for (; sw<HASH_LBLOCK; sw++)
 440                                 {
 441                                 HOST_c2l(data,l); p[sw]=l;
 442                                 }
 443                         HASH_BLOCK_HOST_ORDER (c,p,1);
 444                         len-=(HASH_CBLOCK-c->num);
 445                         c->num=0;
 446                         /* drop through and do the rest */
 447                         }
 448                 else
 449                         {
 450                         c->num+=len;
 451                         if ((sc+len) < 4) /* ugly, add char's to a word */
 452                                 {
 453                                 l=p[sw]; HOST_p_c2l_p(data,l,sc,len); p[sw]=l;
 454                                 }
 455                         else
 456                                 {
 457                                 ew=(c->num>>2);
 458                                 ec=(c->num&0x03);
 459                                 l=p[sw]; HOST_p_c2l(data,l,sc); p[sw++]=l;
 460                                 for (; sw < ew; sw++)
 461                                         {
 462                                         HOST_c2l(data,l); p[sw]=l;
 463                                         }
 464                                 if (ec)
 465                                         {
 466                                         HOST_c2l_p(data,l,ec); p[sw]=l;
 467                                         }
 468                                 }
 469                         return;
 470                         }
 471                 }
 472
 473         sw=len/HASH_CBLOCK;
 474         if (sw > 0)
 475                 {
 476 #if defined(HASH_BLOCK_DATA_ORDER_ALIGNED)
 477                 /*
 478                  * Note that HASH_BLOCK_DATA_ORDER_ALIGNED gets defined
 479                  * only if sizeof(HASH_LONG)==4.
 480                  */
 481                 if ((((unsigned long)data)%4) == 0)
 482                         {
 483                         /* data is properly aligned so that we can cast it: */
 484                         HASH_BLOCK_DATA_ORDER_ALIGNED (c,(HASH_LONG *)data,sw);
 485                         sw*=HASH_CBLOCK;
 486                         data+=sw;
 487                         len-=sw;
 488                         }
 489                 else
 490 #if !defined(HASH_BLOCK_DATA_ORDER)
 491                         while (sw--)
 492                                 {
 493                                 memcpy (p=c->data,data,HASH_CBLOCK);
 494                                 HASH_BLOCK_DATA_ORDER_ALIGNED(c,p,1);
 495                                 data+=HASH_CBLOCK;
 496                                 len-=HASH_CBLOCK;
 497                                 }
 498 #endif
 499 #endif
 500 #if defined(HASH_BLOCK_DATA_ORDER)
 501                         {
 502                         HASH_BLOCK_DATA_ORDER(c,data,sw);
 503                         sw*=HASH_CBLOCK;
 504                         data+=sw;
 505                         len-=sw;
 506                         }
 507 #endif
 508                 }
 509
 510         if (len!=0)
 511                 {
 512                 p = c->data;
 513                 c->num = len;
 514                 ew=len>>2;      /* words to copy */
 515                 ec=len&0x03;
 516                 for (; ew; ew--,p++)
 517                         {
 518                         HOST_c2l(data,l); *p=l;
 519                         }
 520                 HOST_c2l_p(data,l,ec);
 521                 *p=l;
 522                 }
 523         }
 524
 525
 526 void HASH_TRANSFORM (HASH_CTX *c, const unsigned char *data)
 527         {
 528 #if defined(HASH_BLOCK_DATA_ORDER_ALIGNED)
 529         if ((((unsigned long)data)%4) == 0)
 530                 /* data is properly aligned so that we can cast it: */
 531                 HASH_BLOCK_DATA_ORDER_ALIGNED (c,(HASH_LONG *)data,1);
 532         else
 533 #if !defined(HASH_BLOCK_DATA_ORDER)
 534                 {
 535                 memcpy (c->data,data,HASH_CBLOCK);
 536                 HASH_BLOCK_DATA_ORDER_ALIGNED (c,c->data,1);
 537                 }
 538 #endif
 539 #endif
 540 #if defined(HASH_BLOCK_DATA_ORDER)
 541         HASH_BLOCK_DATA_ORDER (c,data,1);
 542 #endif
 543         }
 544
 545
 546 void HASH_FINAL (unsigned char *md, HASH_CTX *c)
 547         {
 548         register HASH_LONG *p;
 549         register unsigned long l;
 550         register int i,j;
 551         static const unsigned char end[4]={0x80,0x00,0x00,0x00};
 552         const unsigned char *cp=end;
 553
 554         /* c->num should definitly have room for at least one more byte. */
 555         p=c->data;
 556         i=c->num>>2;
 557         j=c->num&0x03;
 558
 559 #if 0
 560         /* purify often complains about the following line as an
 561          * Uninitialized Memory Read.  While this can be true, the
 562          * following p_c2l macro will reset l when that case is true.
 563          * This is because j&0x03 contains the number of 'valid' bytes
 564          * already in p[i].  If and only if j&0x03 == 0, the UMR will
 565          * occur but this is also the only time p_c2l will do
 566          * l= *(cp++) instead of l|= *(cp++)
 567          * Many thanks to Alex Tang <altitude@cic.net> for pickup this
 568          * 'potential bug' */
 569 #ifdef PURIFY
 570         if (j==0) p[i]=0; /* Yeah, but that's not the way to fix it:-) */
 571 #endif
 572         l=p[i];
 573 #else
 574         l = (j==0) ? 0 : p[i];
 575 #endif
 576         HOST_p_c2l(cp,l,j); p[i++]=l; /* i is the next 'undefined word' */
 577
 578         if (i>(HASH_LBLOCK-2)) /* save room for Nl and Nh */
 579                 {
 580                 if (i<HASH_LBLOCK) p[i]=0;
 581                 HASH_BLOCK_HOST_ORDER (c,p,1);
 582                 i=0;
 583                 }
 584         for (; i<(HASH_LBLOCK-2); i++)
 585                 p[i]=0;
 586
 587 #if   defined(DATA_ORDER_IS_BIG_ENDIAN)
 588         p[HASH_LBLOCK-2]=c->Nh;
 589         p[HASH_LBLOCK-1]=c->Nl;
 590 #elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
 591         p[HASH_LBLOCK-2]=c->Nl;
 592         p[HASH_LBLOCK-1]=c->Nh;
 593 #endif
 594         HASH_BLOCK_HOST_ORDER (c,p,1);
 595
 596 #ifndef HASH_MAKE_STRING
 597 #error "HASH_MAKE_STRING must be defined!"
 598 #else
 599         HASH_MAKE_STRING(c,md);
 600 #endif
 601
 602         c->num=0;
 603         /* clear stuff, HASH_BLOCK may be leaving some stuff on the stack
 604          * but I'm not worried :-)
 605         memset((void *)c,0,sizeof(HASH_CTX));
 606          */
 607         }