apps/enc.c

   1 /* apps/enc.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
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include "apps.h"
  63 #include <openssl/bio.h>
  64 #include <openssl/err.h>
  65 #include <openssl/evp.h>
  66 #include <openssl/objects.h>
  67 #include <openssl/x509.h>
  68 #include <openssl/rand.h>
  69 #ifndef NO_MD5
  70 #include <openssl/md5.h>
  71 #endif
  72 #include <openssl/pem.h>
  73
  74 int set_hex(char *in,unsigned char *out,int size);
  75 #undef SIZE
  76 #undef BSIZE
  77 #undef PROG
  78
  79 #define SIZE    (512)
  80 #define BSIZE   (8*1024)
  81 #define PROG    enc_main
  82
  83 int MAIN(int argc, char **argv)
  84         {
  85         static const char magic[]="Salted__";
  86         char mbuf[8];   /* should be 1 smaller than magic */
  87         char *strbuf=NULL;
  88         unsigned char *buff=NULL,*bufsize=NULL;
  89         int bsize=BSIZE,verbose=0;
  90         int ret=1,inl;
  91         unsigned char key[24],iv[MD5_DIGEST_LENGTH];
  92         unsigned char salt[PKCS5_SALT_LEN];
  93         char *str=NULL;
  94         char *hkey=NULL,*hiv=NULL,*hsalt = NULL;
  95         int enc=1,printkey=0,i,base64=0;
  96         int debug=0,olb64=0,nosalt=0;
  97         const EVP_CIPHER *cipher=NULL,*c;
  98         char *inf=NULL,*outf=NULL;
  99         BIO *in=NULL,*out=NULL,*b64=NULL,*benc=NULL,*rbio=NULL,*wbio=NULL;
 100 #define PROG_NAME_SIZE  16
 101         char pname[PROG_NAME_SIZE];
 102
 103         apps_startup();
 104
 105         if (bio_err == NULL)
 106                 if ((bio_err=BIO_new(BIO_s_file())) != NULL)
 107                         BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
 108
 109         /* first check the program name */
 110         program_name(argv[0],pname,PROG_NAME_SIZE);
 111         if (strcmp(pname,"base64") == 0)
 112                 base64=1;
 113
 114         cipher=EVP_get_cipherbyname(pname);
 115         if (!base64 && (cipher == NULL) && (strcmp(pname,"enc") != 0))
 116                 {
 117                 BIO_printf(bio_err,"%s is an unknown cipher\n",pname);
 118                 goto bad;
 119                 }
 120
 121         argc--;
 122         argv++;
 123         while (argc >= 1)
 124                 {
 125                 if      (strcmp(*argv,"-e") == 0)
 126                         enc=1;
 127                 else if (strcmp(*argv,"-in") == 0)
 128                         {
 129                         if (--argc < 1) goto bad;
 130                         inf= *(++argv);
 131                         }
 132                 else if (strcmp(*argv,"-out") == 0)
 133                         {
 134                         if (--argc < 1) goto bad;
 135                         outf= *(++argv);
 136                         }
 137                 else if (strcmp(*argv,"-d") == 0)
 138                         enc=0;
 139                 else if (strcmp(*argv,"-p") == 0)
 140                         printkey=1;
 141                 else if (strcmp(*argv,"-v") == 0)
 142                         verbose=1;
 143                 else if (strcmp(*argv,"-salt") == 0)
 144                         nosalt=0;
 145                 else if (strcmp(*argv,"-nosalt") == 0)
 146                         nosalt=1;
 147                 else if (strcmp(*argv,"-debug") == 0)
 148                         debug=1;
 149                 else if (strcmp(*argv,"-P") == 0)
 150                         printkey=2;
 151                 else if (strcmp(*argv,"-A") == 0)
 152                         olb64=1;
 153                 else if (strcmp(*argv,"-a") == 0)
 154                         base64=1;
 155                 else if (strcmp(*argv,"-base64") == 0)
 156                         base64=1;
 157                 else if (strcmp(*argv,"-bufsize") == 0)
 158                         {
 159                         if (--argc < 1) goto bad;
 160                         bufsize=(unsigned char *)*(++argv);
 161                         }
 162                 else if (strcmp(*argv,"-k") == 0)
 163                         {
 164                         if (--argc < 1) goto bad;
 165                         str= *(++argv);
 166                         }
 167                 else if (strcmp(*argv,"-kfile") == 0)
 168                         {
 169                         static char buf[128];
 170                         FILE *infile;
 171                         char *file;
 172
 173                         if (--argc < 1) goto bad;
 174                         file= *(++argv);
 175                         infile=fopen(file,"r");
 176                         if (infile == NULL)
 177                                 {
 178                                 BIO_printf(bio_err,"unable to read key from '%s'\n",
 179                                         file);
 180                                 goto bad;
 181                                 }
 182                         buf[0]='\0';
 183                         fgets(buf,128,infile);
 184                         fclose(infile);
 185                         i=strlen(buf);
 186                         if ((i > 0) &&
 187                                 ((buf[i-1] == '\n') || (buf[i-1] == '\r')))
 188                                 buf[--i]='\0';
 189                         if ((i > 0) &&
 190                                 ((buf[i-1] == '\n') || (buf[i-1] == '\r')))
 191                                 buf[--i]='\0';
 192                         if (i < 1)
 193                                 {
 194                                 BIO_printf(bio_err,"zero length password\n");
 195                                 goto bad;
 196                                 }
 197                         str=buf;
 198                         }
 199                 else if (strcmp(*argv,"-K") == 0)
 200                         {
 201                         if (--argc < 1) goto bad;
 202                         hkey= *(++argv);
 203                         }
 204                 else if (strcmp(*argv,"-S") == 0)
 205                         {
 206                         if (--argc < 1) goto bad;
 207                         hsalt= *(++argv);
 208                         }
 209                 else if (strcmp(*argv,"-iv") == 0)
 210                         {
 211                         if (--argc < 1) goto bad;
 212                         hiv= *(++argv);
 213                         }
 214                 else if ((argv[0][0] == '-') &&
 215                         ((c=EVP_get_cipherbyname(&(argv[0][1]))) != NULL))
 216                         {
 217                         cipher=c;
 218                         }
 219                 else if (strcmp(*argv,"-none") == 0)
 220                         cipher=NULL;
 221                 else
 222                         {
 223                         BIO_printf(bio_err,"unknown option '%s'\n",*argv);
 224 bad:
 225                         BIO_printf(bio_err,"options are\n");
 226                         BIO_printf(bio_err,"%-14s input file\n","-in <file>");
 227                         BIO_printf(bio_err,"%-14s output fileencrypt\n","-out <file>");
 228                         BIO_printf(bio_err,"%-14s encrypt\n","-e");
 229                         BIO_printf(bio_err,"%-14s decrypt\n","-d");
 230                         BIO_printf(bio_err,"%-14s base64 encode/decode, depending on encryption flag\n","-a/-base64");
 231                         BIO_printf(bio_err,"%-14s key is the next argument\n","-k");
 232                         BIO_printf(bio_err,"%-14s key is the first line of the file argument\n","-kfile");
 233                         BIO_printf(bio_err,"%-14s key/iv in hex is the next argument\n","-K/-iv");
 234                         BIO_printf(bio_err,"%-14s print the iv/key (then exit if -P)\n","-[pP]");
 235                         BIO_printf(bio_err,"%-14s buffer size\n","-bufsize <n>");
 236
 237                         BIO_printf(bio_err,"Cipher Types\n");
 238                         BIO_printf(bio_err,"des     : 56 bit key DES encryption\n");
 239                         BIO_printf(bio_err,"des_ede :112 bit key ede DES encryption\n");
 240                         BIO_printf(bio_err,"des_ede3:168 bit key ede DES encryption\n");
 241 #ifndef NO_IDEA
 242                         BIO_printf(bio_err,"idea    :128 bit key IDEA encryption\n");
 243 #endif
 244 #ifndef NO_RC4
 245                         BIO_printf(bio_err,"rc2     :128 bit key RC2 encryption\n");
 246 #endif
 247 #ifndef NO_BF
 248                         BIO_printf(bio_err,"bf      :128 bit key BlowFish encryption\n");
 249 #endif
 250 #ifndef NO_RC4
 251                         BIO_printf(bio_err," -%-5s :128 bit key RC4 encryption\n",
 252                                 LN_rc4);
 253 #endif
 254
 255                         BIO_printf(bio_err," -%-12s -%-12s -%-12s -%-12s",
 256                                 LN_des_ecb,LN_des_cbc,
 257                                 LN_des_cfb64,LN_des_ofb64);
 258                         BIO_printf(bio_err," -%-4s (%s)\n",
 259                                 "des", LN_des_cbc);
 260
 261                         BIO_printf(bio_err," -%-12s -%-12s -%-12s -%-12s",
 262                                 LN_des_ede,LN_des_ede_cbc,
 263                                 LN_des_ede_cfb64,LN_des_ede_ofb64);
 264                         BIO_printf(bio_err," -desx -none\n");
 265
 266
 267                         BIO_printf(bio_err," -%-12s -%-12s -%-12s -%-12s",
 268                                 LN_des_ede3,LN_des_ede3_cbc,
 269                                 LN_des_ede3_cfb64,LN_des_ede3_ofb64);
 270                         BIO_printf(bio_err," -%-4s (%s)\n",
 271                                 "des3", LN_des_ede3_cbc);
 272
 273 #ifndef NO_IDEA
 274                         BIO_printf(bio_err," -%-12s -%-12s -%-12s -%-12s",
 275                                 LN_idea_ecb, LN_idea_cbc,
 276                                 LN_idea_cfb64, LN_idea_ofb64);
 277                         BIO_printf(bio_err," -%-4s (%s)\n","idea",LN_idea_cbc);
 278 #endif
 279 #ifndef NO_RC2
 280                         BIO_printf(bio_err," -%-12s -%-12s -%-12s -%-12s",
 281                                 LN_rc2_ecb, LN_rc2_cbc,
 282                                 LN_rc2_cfb64, LN_rc2_ofb64);
 283                         BIO_printf(bio_err," -%-4s (%s)\n","rc2", LN_rc2_cbc);
 284 #endif
 285 #ifndef NO_BF
 286                         BIO_printf(bio_err," -%-12s -%-12s -%-12s -%-12s",
 287                                 LN_bf_ecb, LN_bf_cbc,
 288                                 LN_bf_cfb64, LN_bf_ofb64);
 289                         BIO_printf(bio_err," -%-4s (%s)\n","bf", LN_bf_cbc);
 290 #endif
 291 #ifndef NO_CAST
 292                         BIO_printf(bio_err," -%-12s -%-12s -%-12s -%-12s",
 293                                 LN_cast5_ecb, LN_cast5_cbc,
 294                                 LN_cast5_cfb64, LN_cast5_ofb64);
 295                         BIO_printf(bio_err," -%-4s (%s)\n","cast", LN_cast5_cbc);
 296 #endif
 297 #ifndef NO_RC5
 298                         BIO_printf(bio_err," -%-12s -%-12s -%-12s -%-12s",
 299                                 LN_rc5_ecb, LN_rc5_cbc,
 300                                 LN_rc5_cfb64, LN_rc5_ofb64);
 301                         BIO_printf(bio_err," -%-4s (%s)\n","rc5", LN_rc5_cbc);
 302 #endif
 303                         goto end;
 304                         }
 305                 argc--;
 306                 argv++;
 307                 }
 308
 309         if (bufsize != NULL)
 310                 {
 311                 unsigned long n;
 312
 313                 for (n=0; *bufsize; bufsize++)
 314                         {
 315                         i= *bufsize;
 316                         if ((i <= '9') && (i >= '0'))
 317                                 n=n*10+i-'0';
 318                         else if (i == 'k')
 319                                 {
 320                                 n*=1024;
 321                                 bufsize++;
 322                                 break;
 323                                 }
 324                         }
 325                 if (*bufsize != '\0')
 326                         {
 327                         BIO_printf(bio_err,"invalid 'bufsize' specified.\n");
 328                         goto end;
 329                         }
 330
 331                 /* It must be large enough for a base64 encoded line */
 332                 if (n < 80) n=80;
 333
 334                 bsize=(int)n;
 335                 if (verbose) BIO_printf(bio_err,"bufsize=%d\n",bsize);
 336                 }
 337
 338         strbuf=Malloc(SIZE);
 339         buff=(unsigned char *)Malloc(EVP_ENCODE_LENGTH(bsize));
 340         if ((buff == NULL) || (strbuf == NULL))
 341                 {
 342                 BIO_printf(bio_err,"Malloc failure %ld\n",(long)EVP_ENCODE_LENGTH(bsize));
 343                 goto end;
 344                 }
 345
 346         in=BIO_new(BIO_s_file());
 347         out=BIO_new(BIO_s_file());
 348         if ((in == NULL) || (out == NULL))
 349                 {
 350                 ERR_print_errors(bio_err);
 351                 goto end;
 352                 }
 353         if (debug)
 354                 {
 355                 BIO_set_callback(in,BIO_debug_callback);
 356                 BIO_set_callback(out,BIO_debug_callback);
 357                 BIO_set_callback_arg(in,bio_err);
 358                 BIO_set_callback_arg(out,bio_err);
 359                 }
 360
 361         if (inf == NULL)
 362                 BIO_set_fp(in,stdin,BIO_NOCLOSE);
 363         else
 364                 {
 365                 if (BIO_read_filename(in,inf) <= 0)
 366                         {
 367                         perror(inf);
 368                         goto end;
 369                         }
 370                 }
 371
 372         if ((str == NULL) && (cipher != NULL) && (hkey == NULL))
 373                 {
 374                 for (;;)
 375                         {
 376                         char buf[200];
 377
 378                         sprintf(buf,"enter %s %s password:",
 379                                 OBJ_nid2ln(EVP_CIPHER_nid(cipher)),
 380                                 (enc)?"encryption":"decryption");
 381                         strbuf[0]='\0';
 382                         i=EVP_read_pw_string((char *)strbuf,SIZE,buf,enc);
 383                         if (i == 0)
 384                                 {
 385                                 if (strbuf[0] == '\0')
 386                                         {
 387                                         ret=1;
 388                                         goto end;
 389                                         }
 390                                 str=strbuf;
 391                                 break;
 392                                 }
 393                         if (i < 0)
 394                                 {
 395                                 BIO_printf(bio_err,"bad password read\n");
 396                                 goto end;
 397                                 }
 398                         }
 399                 }
 400
 401
 402         if (outf == NULL)
 403                 BIO_set_fp(out,stdout,BIO_NOCLOSE);
 404         else
 405                 {
 406                 if (BIO_write_filename(out,outf) <= 0)
 407                         {
 408                         perror(outf);
 409                         goto end;
 410                         }
 411                 }
 412
 413         rbio=in;
 414         wbio=out;
 415
 416         if (base64)
 417                 {
 418                 if ((b64=BIO_new(BIO_f_base64())) == NULL)
 419                         goto end;
 420                 if (debug)
 421                         {
 422                         BIO_set_callback(b64,BIO_debug_callback);
 423                         BIO_set_callback_arg(b64,bio_err);
 424                         }
 425                 if (olb64)
 426                         BIO_set_flags(b64,BIO_FLAGS_BASE64_NO_NL);
 427                 if (enc)
 428                         wbio=BIO_push(b64,wbio);
 429                 else
 430                         rbio=BIO_push(b64,rbio);
 431                 }
 432
 433         if (cipher != NULL)
 434                 {
 435                 if (str != NULL)
 436                         {
 437                         /* Salt handling: if encrypting generate a salt and
 438                          * write to output BIO. If decrypting read salt from
 439                          * input BIO.
 440                          */
 441                         unsigned char *sptr;
 442                         if(nosalt) sptr = NULL;
 443                         else {
 444                                 if(enc) {
 445                                         if(hsalt) {
 446                                                 if(!set_hex(hsalt,salt,PKCS5_SALT_LEN)) {
 447                                                         BIO_printf(bio_err,
 448                                                                 "invalid hex salt value\n");
 449                                                         goto end;
 450                                                 }
 451                                         } else if (RAND_bytes(salt, PKCS5_SALT_LEN) <= 0) {
 452                                                 BIO_printf(bio_err,
 453                                                         "prng not seeded\n");
 454                                                 goto end;
 455                                         }
 456                                         /* If -P option then don't bother writing */
 457                                         if((printkey != 2)
 458                                            && (BIO_write(wbio,magic,
 459                                                          sizeof magic-1) != sizeof magic-1
 460                                                || BIO_write(wbio,
 461                                                             (char *)salt,
 462                                                             PKCS5_SALT_LEN) != PKCS5_SALT_LEN)) {
 463                                                 BIO_printf(bio_err,"error writing output file\n");
 464                                                 goto end;
 465                                         }
 466                                 } else if(BIO_read(rbio,mbuf,sizeof mbuf) != sizeof mbuf
 467                                           || BIO_read(rbio,
 468                                                       (unsigned char *)salt,
 469                                     PKCS5_SALT_LEN) != PKCS5_SALT_LEN) {
 470                                         BIO_printf(bio_err,"error reading input file\n");
 471                                         goto end;
 472                                 } else if(memcmp(mbuf,magic,sizeof magic-1)) {
 473                                     BIO_printf(bio_err,"bad magic number\n");
 474                                     goto end;
 475                                 }
 476
 477                                 sptr = salt;
 478                         }
 479
 480                         EVP_BytesToKey(cipher,EVP_md5(),sptr,
 481                                 (unsigned char *)str,
 482                                 strlen(str),1,key,iv);
 483                         /* zero the complete buffer or the string
 484                          * passed from the command line
 485                          * bug picked up by
 486                          * Larry J. Hughes Jr. <hughes@indiana.edu> */
 487                         if (str == strbuf)
 488                                 memset(str,0,SIZE);
 489                         else
 490                                 memset(str,0,strlen(str));
 491                         }
 492                 if ((hiv != NULL) && !set_hex(hiv,iv,8))
 493                         {
 494                         BIO_printf(bio_err,"invalid hex iv value\n");
 495                         goto end;
 496                         }
 497                 if ((hkey != NULL) && !set_hex(hkey,key,24))
 498                         {
 499                         BIO_printf(bio_err,"invalid hex key value\n");
 500                         goto end;
 501                         }
 502
 503                 if ((benc=BIO_new(BIO_f_cipher())) == NULL)
 504                         goto end;
 505                 BIO_set_cipher(benc,cipher,key,iv,enc);
 506                 if (debug)
 507                         {
 508                         BIO_set_callback(benc,BIO_debug_callback);
 509                         BIO_set_callback_arg(benc,bio_err);
 510                         }
 511
 512                 if (printkey)
 513                         {
 514                         if (!nosalt)
 515                                 {
 516                                 printf("salt=");
 517                                 for (i=0; i<PKCS5_SALT_LEN; i++)
 518                                         printf("%02X",salt[i]);
 519                                 printf("\n");
 520                                 }
 521                         if (cipher->key_len > 0)
 522                                 {
 523                                 printf("key=");
 524                                 for (i=0; i<cipher->key_len; i++)
 525                                         printf("%02X",key[i]);
 526                                 printf("\n");
 527                                 }
 528                         if (cipher->iv_len > 0)
 529                                 {
 530                                 printf("iv =");
 531                                 for (i=0; i<cipher->iv_len; i++)
 532                                         printf("%02X",iv[i]);
 533                                 printf("\n");
 534                                 }
 535                         if (printkey == 2)
 536                                 {
 537                                 ret=0;
 538                                 goto end;
 539                                 }
 540                         }
 541                 }
 542
 543         /* Only encrypt/decrypt as we write the file */
 544         if (benc != NULL)
 545                 wbio=BIO_push(benc,wbio);
 546
 547         for (;;)
 548                 {
 549                 inl=BIO_read(rbio,(char *)buff,bsize);
 550                 if (inl <= 0) break;
 551                 if (BIO_write(wbio,(char *)buff,inl) != inl)
 552                         {
 553                         BIO_printf(bio_err,"error writing output file\n");
 554                         goto end;
 555                         }
 556                 }
 557         if (!BIO_flush(wbio))
 558                 {
 559                 BIO_printf(bio_err,"bad decrypt\n");
 560                 goto end;
 561                 }
 562
 563         ret=0;
 564         if (verbose)
 565                 {
 566                 BIO_printf(bio_err,"bytes read   :%8ld\n",BIO_number_read(in));
 567                 BIO_printf(bio_err,"bytes written:%8ld\n",BIO_number_written(out));
 568                 }
 569 end:
 570         if (strbuf != NULL) Free(strbuf);
 571         if (buff != NULL) Free(buff);
 572         if (in != NULL) BIO_free(in);
 573         if (out != NULL) BIO_free(out);
 574         if (benc != NULL) BIO_free(benc);
 575         if (b64 != NULL) BIO_free(b64);
 576         EXIT(ret);
 577         }
 578
 579 int set_hex(char *in, unsigned char *out, int size)
 580         {
 581         int i,n;
 582         unsigned char j;
 583
 584         n=strlen(in);
 585         if (n > (size*2))
 586                 {
 587                 BIO_printf(bio_err,"hex string is too long\n");
 588                 return(0);
 589                 }
 590         memset(out,0,size);
 591         for (i=0; i<n; i++)
 592                 {
 593                 j=(unsigned char)*in;
 594                 *(in++)='\0';
 595                 if (j == 0) break;
 596                 if ((j >= '0') && (j <= '9'))
 597                         j-='0';
 598                 else if ((j >= 'A') && (j <= 'F'))
 599                         j=j-'A'+10;
 600                 else if ((j >= 'a') && (j <= 'f'))
 601                         j=j-'a'+10;
 602                 else
 603                         {
 604                         BIO_printf(bio_err,"non-hex digit\n");
 605                         return(0);
 606                         }
 607                 if (i&1)
 608                         out[i/2]|=j;
 609                 else
 610                         out[i/2]=(j<<4);
 611                 }
 612         return(1);
 613         }