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