lib/libmd/rmd160c.c

   1 /* crypto/ripemd/rmd_dgst.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  *
  58  * $FreeBSD: src/lib/libmd/rmd160c.c,v 1.7 2006/01/17 15:35:56 phk Exp $
  59  * $DragonFly: src/lib/libmd/rmd160c.c,v 1.6 2008/09/30 16:57:05 swildner Exp $
  60  */
  61
  62 #include <sys/types.h>
  63
  64 #include <stdio.h>
  65 #include <string.h>
  66
  67 #include <machine/endian.h>
  68
  69 #include "rmd_locl.h"
  70
  71 /*
  72  * The assembly-language code is not position-independent, so don't
  73  * try to use it in a shared library.
  74  */
  75 #ifdef PIC
  76 #undef RMD160_ASM
  77 #endif
  78
  79 char *RMD160_version="RIPEMD160 part of SSLeay 0.9.0b 11-Oct-1998";
  80
  81 #ifdef RMD160_ASM
  82 void ripemd160_block_x86(RIPEMD160_CTX *c, const u_int32_t *p,int num);
  83 #define ripemd160_block ripemd160_block_x86
  84 #else
  85 void ripemd160_block(RIPEMD160_CTX *c, const u_int32_t *p,int num);
  86 #endif
  87
  88 void
  89 RIPEMD160_Init(RIPEMD160_CTX *c)
  90         {
  91         c->A=RIPEMD160_A;
  92         c->B=RIPEMD160_B;
  93         c->C=RIPEMD160_C;
  94         c->D=RIPEMD160_D;
  95         c->E=RIPEMD160_E;
  96         c->Nl=0;
  97         c->Nh=0;
  98         c->num=0;
  99         }
 100
 101 void
 102 RIPEMD160_Update(RIPEMD160_CTX *c, const void *in, size_t len)
 103         {
 104         u_int32_t *p;
 105         int sw,sc;
 106         u_int32_t l;
 107         const unsigned char *data = in;
 108
 109         if (len == 0) return;
 110
 111         l=(c->Nl+(len<<3))&0xffffffffL;
 112         if (l < c->Nl) /* overflow */
 113                 c->Nh++;
 114         c->Nh+=(len>>29);
 115         c->Nl=l;
 116
 117         if (c->num != 0)
 118                 {
 119                 p=c->data;
 120                 sw=c->num>>2;
 121                 sc=c->num&0x03;
 122
 123                 if ((c->num+len) >= RIPEMD160_CBLOCK)
 124                         {
 125                         l= p[sw];
 126                         p_c2l(data,l,sc);
 127                         p[sw++]=l;
 128                         for (; sw<RIPEMD160_LBLOCK; sw++)
 129                                 {
 130                                 c2l(data,l);
 131                                 p[sw]=l;
 132                                 }
 133                         len-=(RIPEMD160_CBLOCK-c->num);
 134
 135                         ripemd160_block(c,p,64);
 136                         c->num=0;
 137                         /* drop through and do the rest */
 138                         }
 139                 else
 140                         {
 141                         int ew,ec;
 142
 143                         c->num+=(int)len;
 144                         if ((sc+len) < 4) /* ugly, add char's to a word */
 145                                 {
 146                                 l= p[sw];
 147                                 p_c2l_p(data,l,sc,len);
 148                                 p[sw]=l;
 149                                 }
 150                         else
 151                                 {
 152                                 ew=(c->num>>2);
 153                                 ec=(c->num&0x03);
 154                                 l= p[sw];
 155                                 p_c2l(data,l,sc);
 156                                 p[sw++]=l;
 157                                 for (; sw < ew; sw++)
 158                                         { c2l(data,l); p[sw]=l; }
 159                                 if (ec)
 160                                         {
 161                                         c2l_p(data,l,ec);
 162                                         p[sw]=l;
 163                                         }
 164                                 }
 165                         return;
 166                         }
 167                 }
 168         /* we now can process the input data in blocks of RIPEMD160_CBLOCK
 169          * chars and save the leftovers to c->data. */
 170 #if BYTE_ORDER == LITTLE_ENDIAN
 171         if ((((unsigned long)data)%sizeof(u_int32_t)) == 0)
 172                 {
 173                 sw=(int)len/RIPEMD160_CBLOCK;
 174                 if (sw > 0)
 175                         {
 176                         sw*=RIPEMD160_CBLOCK;
 177                         ripemd160_block(c,(u_int32_t *)data,sw);
 178                         data+=sw;
 179                         len-=sw;
 180                         }
 181                 }
 182 #endif
 183         p=c->data;
 184         while (len >= RIPEMD160_CBLOCK)
 185                 {
 186 #if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == BIG_ENDIAN
 187                 if (p != (u_int32_t *)data)
 188                         memcpy(p,data,RIPEMD160_CBLOCK);
 189                 data+=RIPEMD160_CBLOCK;
 190 #if BYTE_ORDER == BIG_ENDIAN
 191                 for (sw=(RIPEMD160_LBLOCK/4); sw; sw--)
 192                         {
 193                         Endian_Reverse32(p[0]);
 194                         Endian_Reverse32(p[1]);
 195                         Endian_Reverse32(p[2]);
 196                         Endian_Reverse32(p[3]);
 197                         p+=4;
 198                         }
 199 #endif
 200 #else
 201                 for (sw=(RIPEMD160_LBLOCK/4); sw; sw--)
 202                         {
 203                         c2l(data,l); *(p++)=l;
 204                         c2l(data,l); *(p++)=l;
 205                         c2l(data,l); *(p++)=l;
 206                         c2l(data,l); *(p++)=l;
 207                         }
 208 #endif
 209                 p=c->data;
 210                 ripemd160_block(c,p,64);
 211                 len-=RIPEMD160_CBLOCK;
 212                 }
 213         sc=(int)len;
 214         c->num=sc;
 215         if (sc)
 216                 {
 217                 sw=sc>>2;       /* words to copy */
 218 #if BYTE_ORDER == LITTLE_ENDIAN
 219                 p[sw]=0;
 220                 memcpy(p,data,sc);
 221 #else
 222                 sc&=0x03;
 223                 for ( ; sw; sw--)
 224                         { c2l(data,l); *(p++)=l; }
 225                 c2l_p(data,l,sc);
 226                 *p=l;
 227 #endif
 228                 }
 229         }
 230
 231 void
 232 RIPEMD160_Transform(RIPEMD160_CTX *c, unsigned char *b)
 233         {
 234         u_int32_t p[16];
 235 #if BYTE_ORDER != LITTLE_ENDIAN
 236         u_int32_t *q;
 237         int i;
 238 #endif
 239
 240 #if BYTE_ORDER == BIG_ENDIAN || BYTE_ORDER == LITTLE_ENDIAN
 241         memcpy(p,b,64);
 242 #if BYTE_ORDER == BIG_ENDIAN
 243         q=p;
 244         for (i=(RIPEMD160_LBLOCK/4); i; i--)
 245                 {
 246                 Endian_Reverse32(q[0]);
 247                 Endian_Reverse32(q[1]);
 248                 Endian_Reverse32(q[2]);
 249                 Endian_Reverse32(q[3]);
 250                 q+=4;
 251                 }
 252 #endif
 253 #else
 254         q=p;
 255         for (i=(RIPEMD160_LBLOCK/4); i; i--)
 256                 {
 257                 u_int32_t l;
 258                 c2l(b,l); *(q++)=l;
 259                 c2l(b,l); *(q++)=l;
 260                 c2l(b,l); *(q++)=l;
 261                 c2l(b,l); *(q++)=l;
 262                 }
 263 #endif
 264         ripemd160_block(c,p,64);
 265         }
 266
 267 #ifndef RMD160_ASM
 268
 269 void
 270 ripemd160_block(RIPEMD160_CTX *ctx, const u_int32_t *X, int num)
 271         {
 272         u_int32_t A,B,C,D,E;
 273         u_int32_t a,b,c,d,e;
 274
 275         for (;;)
 276                 {
 277                 A=ctx->A; B=ctx->B; C=ctx->C; D=ctx->D; E=ctx->E;
 278
 279         RIP1(A,B,C,D,E,WL00,SL00);
 280         RIP1(E,A,B,C,D,WL01,SL01);
 281         RIP1(D,E,A,B,C,WL02,SL02);
 282         RIP1(C,D,E,A,B,WL03,SL03);
 283         RIP1(B,C,D,E,A,WL04,SL04);
 284         RIP1(A,B,C,D,E,WL05,SL05);
 285         RIP1(E,A,B,C,D,WL06,SL06);
 286         RIP1(D,E,A,B,C,WL07,SL07);
 287         RIP1(C,D,E,A,B,WL08,SL08);
 288         RIP1(B,C,D,E,A,WL09,SL09);
 289         RIP1(A,B,C,D,E,WL10,SL10);
 290         RIP1(E,A,B,C,D,WL11,SL11);
 291         RIP1(D,E,A,B,C,WL12,SL12);
 292         RIP1(C,D,E,A,B,WL13,SL13);
 293         RIP1(B,C,D,E,A,WL14,SL14);
 294         RIP1(A,B,C,D,E,WL15,SL15);
 295
 296         RIP2(E,A,B,C,D,WL16,SL16,KL1);
 297         RIP2(D,E,A,B,C,WL17,SL17,KL1);
 298         RIP2(C,D,E,A,B,WL18,SL18,KL1);
 299         RIP2(B,C,D,E,A,WL19,SL19,KL1);
 300         RIP2(A,B,C,D,E,WL20,SL20,KL1);
 301         RIP2(E,A,B,C,D,WL21,SL21,KL1);
 302         RIP2(D,E,A,B,C,WL22,SL22,KL1);
 303         RIP2(C,D,E,A,B,WL23,SL23,KL1);
 304         RIP2(B,C,D,E,A,WL24,SL24,KL1);
 305         RIP2(A,B,C,D,E,WL25,SL25,KL1);
 306         RIP2(E,A,B,C,D,WL26,SL26,KL1);
 307         RIP2(D,E,A,B,C,WL27,SL27,KL1);
 308         RIP2(C,D,E,A,B,WL28,SL28,KL1);
 309         RIP2(B,C,D,E,A,WL29,SL29,KL1);
 310         RIP2(A,B,C,D,E,WL30,SL30,KL1);
 311         RIP2(E,A,B,C,D,WL31,SL31,KL1);
 312
 313         RIP3(D,E,A,B,C,WL32,SL32,KL2);
 314         RIP3(C,D,E,A,B,WL33,SL33,KL2);
 315         RIP3(B,C,D,E,A,WL34,SL34,KL2);
 316         RIP3(A,B,C,D,E,WL35,SL35,KL2);
 317         RIP3(E,A,B,C,D,WL36,SL36,KL2);
 318         RIP3(D,E,A,B,C,WL37,SL37,KL2);
 319         RIP3(C,D,E,A,B,WL38,SL38,KL2);
 320         RIP3(B,C,D,E,A,WL39,SL39,KL2);
 321         RIP3(A,B,C,D,E,WL40,SL40,KL2);
 322         RIP3(E,A,B,C,D,WL41,SL41,KL2);
 323         RIP3(D,E,A,B,C,WL42,SL42,KL2);
 324         RIP3(C,D,E,A,B,WL43,SL43,KL2);
 325         RIP3(B,C,D,E,A,WL44,SL44,KL2);
 326         RIP3(A,B,C,D,E,WL45,SL45,KL2);
 327         RIP3(E,A,B,C,D,WL46,SL46,KL2);
 328         RIP3(D,E,A,B,C,WL47,SL47,KL2);
 329
 330         RIP4(C,D,E,A,B,WL48,SL48,KL3);
 331         RIP4(B,C,D,E,A,WL49,SL49,KL3);
 332         RIP4(A,B,C,D,E,WL50,SL50,KL3);
 333         RIP4(E,A,B,C,D,WL51,SL51,KL3);
 334         RIP4(D,E,A,B,C,WL52,SL52,KL3);
 335         RIP4(C,D,E,A,B,WL53,SL53,KL3);
 336         RIP4(B,C,D,E,A,WL54,SL54,KL3);
 337         RIP4(A,B,C,D,E,WL55,SL55,KL3);
 338         RIP4(E,A,B,C,D,WL56,SL56,KL3);
 339         RIP4(D,E,A,B,C,WL57,SL57,KL3);
 340         RIP4(C,D,E,A,B,WL58,SL58,KL3);
 341         RIP4(B,C,D,E,A,WL59,SL59,KL3);
 342         RIP4(A,B,C,D,E,WL60,SL60,KL3);
 343         RIP4(E,A,B,C,D,WL61,SL61,KL3);
 344         RIP4(D,E,A,B,C,WL62,SL62,KL3);
 345         RIP4(C,D,E,A,B,WL63,SL63,KL3);
 346
 347         RIP5(B,C,D,E,A,WL64,SL64,KL4);
 348         RIP5(A,B,C,D,E,WL65,SL65,KL4);
 349         RIP5(E,A,B,C,D,WL66,SL66,KL4);
 350         RIP5(D,E,A,B,C,WL67,SL67,KL4);
 351         RIP5(C,D,E,A,B,WL68,SL68,KL4);
 352         RIP5(B,C,D,E,A,WL69,SL69,KL4);
 353         RIP5(A,B,C,D,E,WL70,SL70,KL4);
 354         RIP5(E,A,B,C,D,WL71,SL71,KL4);
 355         RIP5(D,E,A,B,C,WL72,SL72,KL4);
 356         RIP5(C,D,E,A,B,WL73,SL73,KL4);
 357         RIP5(B,C,D,E,A,WL74,SL74,KL4);
 358         RIP5(A,B,C,D,E,WL75,SL75,KL4);
 359         RIP5(E,A,B,C,D,WL76,SL76,KL4);
 360         RIP5(D,E,A,B,C,WL77,SL77,KL4);
 361         RIP5(C,D,E,A,B,WL78,SL78,KL4);
 362         RIP5(B,C,D,E,A,WL79,SL79,KL4);
 363
 364         a=A; b=B; c=C; d=D; e=E;
 365         /* Do other half */
 366         A=ctx->A; B=ctx->B; C=ctx->C; D=ctx->D; E=ctx->E;
 367
 368         RIP5(A,B,C,D,E,WR00,SR00,KR0);
 369         RIP5(E,A,B,C,D,WR01,SR01,KR0);
 370         RIP5(D,E,A,B,C,WR02,SR02,KR0);
 371         RIP5(C,D,E,A,B,WR03,SR03,KR0);
 372         RIP5(B,C,D,E,A,WR04,SR04,KR0);
 373         RIP5(A,B,C,D,E,WR05,SR05,KR0);
 374         RIP5(E,A,B,C,D,WR06,SR06,KR0);
 375         RIP5(D,E,A,B,C,WR07,SR07,KR0);
 376         RIP5(C,D,E,A,B,WR08,SR08,KR0);
 377         RIP5(B,C,D,E,A,WR09,SR09,KR0);
 378         RIP5(A,B,C,D,E,WR10,SR10,KR0);
 379         RIP5(E,A,B,C,D,WR11,SR11,KR0);
 380         RIP5(D,E,A,B,C,WR12,SR12,KR0);
 381         RIP5(C,D,E,A,B,WR13,SR13,KR0);
 382         RIP5(B,C,D,E,A,WR14,SR14,KR0);
 383         RIP5(A,B,C,D,E,WR15,SR15,KR0);
 384
 385         RIP4(E,A,B,C,D,WR16,SR16,KR1);
 386         RIP4(D,E,A,B,C,WR17,SR17,KR1);
 387         RIP4(C,D,E,A,B,WR18,SR18,KR1);
 388         RIP4(B,C,D,E,A,WR19,SR19,KR1);
 389         RIP4(A,B,C,D,E,WR20,SR20,KR1);
 390         RIP4(E,A,B,C,D,WR21,SR21,KR1);
 391         RIP4(D,E,A,B,C,WR22,SR22,KR1);
 392         RIP4(C,D,E,A,B,WR23,SR23,KR1);
 393         RIP4(B,C,D,E,A,WR24,SR24,KR1);
 394         RIP4(A,B,C,D,E,WR25,SR25,KR1);
 395         RIP4(E,A,B,C,D,WR26,SR26,KR1);
 396         RIP4(D,E,A,B,C,WR27,SR27,KR1);
 397         RIP4(C,D,E,A,B,WR28,SR28,KR1);
 398         RIP4(B,C,D,E,A,WR29,SR29,KR1);
 399         RIP4(A,B,C,D,E,WR30,SR30,KR1);
 400         RIP4(E,A,B,C,D,WR31,SR31,KR1);
 401
 402         RIP3(D,E,A,B,C,WR32,SR32,KR2);
 403         RIP3(C,D,E,A,B,WR33,SR33,KR2);
 404         RIP3(B,C,D,E,A,WR34,SR34,KR2);
 405         RIP3(A,B,C,D,E,WR35,SR35,KR2);
 406         RIP3(E,A,B,C,D,WR36,SR36,KR2);
 407         RIP3(D,E,A,B,C,WR37,SR37,KR2);
 408         RIP3(C,D,E,A,B,WR38,SR38,KR2);
 409         RIP3(B,C,D,E,A,WR39,SR39,KR2);
 410         RIP3(A,B,C,D,E,WR40,SR40,KR2);
 411         RIP3(E,A,B,C,D,WR41,SR41,KR2);
 412         RIP3(D,E,A,B,C,WR42,SR42,KR2);
 413         RIP3(C,D,E,A,B,WR43,SR43,KR2);
 414         RIP3(B,C,D,E,A,WR44,SR44,KR2);
 415         RIP3(A,B,C,D,E,WR45,SR45,KR2);
 416         RIP3(E,A,B,C,D,WR46,SR46,KR2);
 417         RIP3(D,E,A,B,C,WR47,SR47,KR2);
 418
 419         RIP2(C,D,E,A,B,WR48,SR48,KR3);
 420         RIP2(B,C,D,E,A,WR49,SR49,KR3);
 421         RIP2(A,B,C,D,E,WR50,SR50,KR3);
 422         RIP2(E,A,B,C,D,WR51,SR51,KR3);
 423         RIP2(D,E,A,B,C,WR52,SR52,KR3);
 424         RIP2(C,D,E,A,B,WR53,SR53,KR3);
 425         RIP2(B,C,D,E,A,WR54,SR54,KR3);
 426         RIP2(A,B,C,D,E,WR55,SR55,KR3);
 427         RIP2(E,A,B,C,D,WR56,SR56,KR3);
 428         RIP2(D,E,A,B,C,WR57,SR57,KR3);
 429         RIP2(C,D,E,A,B,WR58,SR58,KR3);
 430         RIP2(B,C,D,E,A,WR59,SR59,KR3);
 431         RIP2(A,B,C,D,E,WR60,SR60,KR3);
 432         RIP2(E,A,B,C,D,WR61,SR61,KR3);
 433         RIP2(D,E,A,B,C,WR62,SR62,KR3);
 434         RIP2(C,D,E,A,B,WR63,SR63,KR3);
 435
 436         RIP1(B,C,D,E,A,WR64,SR64);
 437         RIP1(A,B,C,D,E,WR65,SR65);
 438         RIP1(E,A,B,C,D,WR66,SR66);
 439         RIP1(D,E,A,B,C,WR67,SR67);
 440         RIP1(C,D,E,A,B,WR68,SR68);
 441         RIP1(B,C,D,E,A,WR69,SR69);
 442         RIP1(A,B,C,D,E,WR70,SR70);
 443         RIP1(E,A,B,C,D,WR71,SR71);
 444         RIP1(D,E,A,B,C,WR72,SR72);
 445         RIP1(C,D,E,A,B,WR73,SR73);
 446         RIP1(B,C,D,E,A,WR74,SR74);
 447         RIP1(A,B,C,D,E,WR75,SR75);
 448         RIP1(E,A,B,C,D,WR76,SR76);
 449         RIP1(D,E,A,B,C,WR77,SR77);
 450         RIP1(C,D,E,A,B,WR78,SR78);
 451         RIP1(B,C,D,E,A,WR79,SR79);
 452
 453         D     =ctx->B+c+D;
 454         ctx->B=ctx->C+d+E;
 455         ctx->C=ctx->D+e+A;
 456         ctx->D=ctx->E+a+B;
 457         ctx->E=ctx->A+b+C;
 458         ctx->A=D;
 459
 460         X+=16;
 461         num-=64;
 462         if (num <= 0) break;
 463                 }
 464         }
 465 #endif
 466
 467 void
 468 RIPEMD160_Final(unsigned char *md, RIPEMD160_CTX *c)
 469         {
 470         int i,j;
 471         u_int32_t l;
 472         u_int32_t *p;
 473         static unsigned char end[4]={0x80,0x00,0x00,0x00};
 474         unsigned char *cp=end;
 475
 476         /* c->num should definitly have room for at least one more byte. */
 477         p=c->data;
 478         j=c->num;
 479         i=j>>2;
 480
 481         /* purify often complains about the following line as an
 482          * Uninitialized Memory Read.  While this can be true, the
 483          * following p_c2l macro will reset l when that case is true.
 484          * This is because j&0x03 contains the number of 'valid' bytes
 485          * already in p[i].  If and only if j&0x03 == 0, the UMR will
 486          * occur but this is also the only time p_c2l will do
 487          * l= *(cp++) instead of l|= *(cp++)
 488          * Many thanks to Alex Tang <altitude@cic.net> for pickup this
 489          * 'potential bug' */
 490 #ifdef PURIFY
 491         if ((j&0x03) == 0) p[i]=0;
 492 #endif
 493         l=p[i];
 494         p_c2l(cp,l,j&0x03);
 495         p[i]=l;
 496         i++;
 497         /* i is the next 'undefined word' */
 498         if (c->num >= RIPEMD160_LAST_BLOCK)
 499                 {
 500                 for (; i<RIPEMD160_LBLOCK; i++)
 501                         p[i]=0;
 502                 ripemd160_block(c,p,64);
 503                 i=0;
 504                 }
 505         for (; i<(RIPEMD160_LBLOCK-2); i++)
 506                 p[i]=0;
 507         p[RIPEMD160_LBLOCK-2]=c->Nl;
 508         p[RIPEMD160_LBLOCK-1]=c->Nh;
 509         ripemd160_block(c,p,64);
 510         cp=md;
 511         l=c->A; l2c(l,cp);
 512         l=c->B; l2c(l,cp);
 513         l=c->C; l2c(l,cp);
 514         l=c->D; l2c(l,cp);
 515         l=c->E; l2c(l,cp);
 516
 517         /* clear stuff, ripemd160_block may be leaving some stuff on the stack
 518          * but I'm not worried :-) */
 519         c->num=0;
 520 /*      memset((char *)&c,0,sizeof(c));*/
 521         }
 522
 523 #ifdef undef
 524 int
 525 printit(unsigned long *l)
 526         {
 527         int i,ii;
 528
 529         for (i=0; i<2; i++)
 530                 {
 531                 for (ii=0; ii<8; ii++)
 532                         {
 533                         fprintf(stderr,"%08lx ",l[i*8+ii]);
 534                         }
 535                 fprintf(stderr,"\n");
 536                 }
 537         }
 538 #endif