apps/enc.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include "apps.h"
  62 #include <openssl/bio.h>
  63 #include <openssl/err.h>
  64 #include <openssl/evp.h>
  65 #include <openssl/objects.h>
  66 #include <openssl/x509.h>
  67 #include <openssl/rand.h>
  68 #include <openssl/pem.h>
  69 #ifndef OPENSSL_NO_COMP
  70 # include <openssl/comp.h>
  71 #endif
  72 #include <ctype.h>
  73
  74 #undef SIZE
  75 #undef BSIZE
  76 #define SIZE    (512)
  77 #define BSIZE   (8*1024)
  78
  79 static int set_hex(char *in, unsigned char *out, int size);
  80 static void show_ciphers(const OBJ_NAME *name, void *bio_);
  81
  82 typedef enum OPTION_choice {
  83     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  84     OPT_E, OPT_IN, OPT_OUT, OPT_PASS, OPT_ENGINE, OPT_D, OPT_P, OPT_V,
  85     OPT_NOPAD, OPT_SALT, OPT_NOSALT, OPT_DEBUG, OPT_UPPER_P, OPT_UPPER_A,
  86     OPT_A, OPT_Z, OPT_BUFSIZE, OPT_K, OPT_KFILE, OPT_UPPER_K, OPT_NONE,
  87     OPT_UPPER_S, OPT_IV, OPT_MD, OPT_NON_FIPS_ALLOW, OPT_CIPHER
  88 } OPTION_CHOICE;
  89
  90 OPTIONS enc_options[] = {
  91     {"help", OPT_HELP, '-', "Display this summary"},
  92     {"in", OPT_IN, '<', "Input file"},
  93     {"out", OPT_OUT, '>', "Output file"},
  94     {"pass", OPT_PASS, 's', "Passphrase source"},
  95 #ifndef OPENSSL_NO_ENGINE
  96     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  97 #endif
  98     {"e", OPT_E, '-', "Encrypt"},
  99     {"d", OPT_D, '-', "Decrypt"},
 100     {"p", OPT_P, '-', "Print the iv/key"},
 101     {"P", OPT_UPPER_P, '-', "Print the iv/key and exit"},
 102     {"v", OPT_V, '-'},
 103     {"nopad", OPT_NOPAD, '-', "Disable standard block padding"},
 104     {"salt", OPT_SALT, '-'},
 105     {"nosalt", OPT_NOSALT, '-'},
 106     {"debug", OPT_DEBUG, '-'},
 107     {"A", OPT_UPPER_A, '-'},
 108     {"a", OPT_A, '-', "base64 encode/decode, depending on encryption flag"},
 109     {"base64", OPT_A, '-', "Base64 output as a single line"},
 110 #ifdef ZLIB
 111     {"z", OPT_Z, '-', "Use zlib as the 'encryption'"},
 112 #endif
 113     {"bufsize", OPT_BUFSIZE, 's', "Buffer size"},
 114     {"k", OPT_K, 's', "Passphrase"},
 115     {"kfile", OPT_KFILE, '<', "Fead passphrase from file"},
 116     {"K", OPT_UPPER_K, '-', "Same as -iv"},
 117     {"S", OPT_UPPER_S, 's', "Salt, in hex"},
 118     {"iv", OPT_IV, 's', "IV in hex"},
 119     {"md", OPT_MD, 's', "Use specified digest to create key from passphrase"},
 120     {"non-fips-allow", OPT_NON_FIPS_ALLOW, '-'},
 121     {"none", OPT_NONE, '-', "Don't encrypt"},
 122     {"", OPT_CIPHER, '-', "Any supported cipher"},
 123     {NULL}
 124 };
 125
 126 int enc_main(int argc, char **argv)
 127 {
 128     static char buf[128];
 129     static const char magic[] = "Salted__";
 130     BIO *in = NULL, *out = NULL, *b64 = NULL, *benc = NULL, *rbio =
 131         NULL, *wbio = NULL;
 132     EVP_CIPHER_CTX *ctx = NULL;
 133     const EVP_CIPHER *cipher = NULL, *c;
 134     const EVP_MD *dgst = NULL;
 135     char *hkey = NULL, *hiv = NULL, *hsalt = NULL, *p;
 136     char *infile = NULL, *outfile = NULL, *prog;
 137     char *str = NULL, *passarg = NULL, *pass = NULL, *strbuf = NULL;
 138     char mbuf[sizeof magic - 1];
 139     OPTION_CHOICE o;
 140     int bsize = BSIZE, verbose = 0, debug = 0, olb64 = 0, nosalt = 0;
 141     int enc = 1, printkey = 0, i, k, base64 = 0;
 142     int ret = 1, inl, nopad = 0, non_fips_allow = 0;
 143     unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
 144     unsigned char *buff = NULL, salt[PKCS5_SALT_LEN];
 145     unsigned long n;
 146 #ifdef ZLIB
 147     int do_zlib = 0;
 148     BIO *bzl = NULL;
 149 #endif
 150
 151     /* first check the program name */
 152     prog = opt_progname(argv[0]);
 153     if (strcmp(prog, "base64") == 0)
 154         base64 = 1;
 155 #ifdef ZLIB
 156     else if (strcmp(prog, "zlib") == 0)
 157         do_zlib = 1;
 158 #endif
 159     else {
 160         cipher = EVP_get_cipherbyname(prog);
 161         if (cipher == NULL && strcmp(prog, "enc") != 0) {
 162             BIO_printf(bio_err, "%s is not a known cipher\n", prog);
 163             goto end;
 164         }
 165     }
 166
 167     prog = opt_init(argc, argv, enc_options);
 168     while ((o = opt_next()) != OPT_EOF) {
 169         switch (o) {
 170         case OPT_EOF:
 171         case OPT_ERR:
 172  opthelp:
 173             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 174             goto end;
 175         case OPT_HELP:
 176             opt_help(enc_options);
 177             ret = 0;
 178             BIO_printf(bio_err, "Cipher Types\n");
 179             OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH,
 180                                    show_ciphers, bio_err);
 181             BIO_printf(bio_err, "\n");
 182             goto end;
 183         case OPT_E:
 184             enc = 1;
 185             break;
 186         case OPT_IN:
 187             infile = opt_arg();
 188             break;
 189         case OPT_OUT:
 190             outfile = opt_arg();
 191             break;
 192         case OPT_PASS:
 193             passarg = opt_arg();
 194             break;
 195         case OPT_ENGINE:
 196             (void)setup_engine(opt_arg(), 0);
 197             break;
 198         case OPT_D:
 199             enc = 0;
 200             break;
 201         case OPT_P:
 202             printkey = 1;
 203             break;
 204         case OPT_V:
 205             verbose = 1;
 206             break;
 207         case OPT_NOPAD:
 208             nopad = 1;
 209             break;
 210         case OPT_SALT:
 211             nosalt = 0;
 212             break;
 213         case OPT_NOSALT:
 214             nosalt = 1;
 215             break;
 216         case OPT_DEBUG:
 217             debug = 1;
 218             break;
 219         case OPT_UPPER_P:
 220             printkey = 2;
 221             break;
 222         case OPT_UPPER_A:
 223             olb64 = 1;
 224             break;
 225         case OPT_A:
 226             base64 = 1;
 227             break;
 228         case OPT_Z:
 229 #ifdef ZLIB
 230             do_zlib = 1;
 231 #endif
 232             break;
 233         case OPT_BUFSIZE:
 234             p = opt_arg();
 235             i = (int)strlen(p) - 1;
 236             k = i >= 1 && p[i] == 'k';
 237             if (k)
 238                 p[i] = '\0';
 239             if (!opt_ulong(opt_arg(), &n))
 240                 goto opthelp;
 241             if (k)
 242                 n *= 1024;
 243             bsize = (int)n;
 244             break;
 245         case OPT_K:
 246             str = opt_arg();
 247             break;
 248         case OPT_KFILE:
 249             in = bio_open_default(opt_arg(), "r");
 250             if (in == NULL)
 251                 goto opthelp;
 252             i = BIO_gets(in, buf, sizeof buf);
 253             BIO_free(in);
 254             in = NULL;
 255             if (i <= 0) {
 256                 BIO_printf(bio_err,
 257                            "%s Can't read key from %s\n", prog, opt_arg());
 258                 goto opthelp;
 259             }
 260             while (--i > 0 && (buf[i] == '\r' || buf[i] == '\n'))
 261                 buf[i] = '\0';
 262             if (i <= 0) {
 263                 BIO_printf(bio_err, "%s: zero length password\n", prog);
 264                 goto opthelp;
 265             }
 266             str = buf;
 267             break;
 268         case OPT_UPPER_K:
 269             hkey = opt_arg();
 270             break;
 271         case OPT_UPPER_S:
 272             hsalt = opt_arg();
 273             break;
 274         case OPT_IV:
 275             hiv = opt_arg();
 276             break;
 277         case OPT_MD:
 278             if (!opt_md(opt_arg(), &dgst))
 279                 goto opthelp;
 280             break;
 281         case OPT_NON_FIPS_ALLOW:
 282             non_fips_allow = 1;
 283             break;
 284         case OPT_CIPHER:
 285             if (!opt_cipher(opt_unknown(), &c))
 286                 goto opthelp;
 287             cipher = c;
 288             break;
 289         case OPT_NONE:
 290             cipher = NULL;
 291             break;
 292         }
 293     }
 294     argc = opt_num_rest();
 295     argv = opt_rest();
 296
 297     if (cipher && EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) {
 298         BIO_printf(bio_err, "%s: AEAD ciphers not supported\n", prog);
 299         goto end;
 300     }
 301
 302     if (cipher && (EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)) {
 303         BIO_printf(bio_err, "%s XTS ciphers not supported\n", prog);
 304         goto end;
 305     }
 306
 307     if (dgst == NULL)
 308         dgst = EVP_md5();
 309
 310     /* It must be large enough for a base64 encoded line */
 311     if (base64 && bsize < 80)
 312         bsize = 80;
 313     if (verbose)
 314         BIO_printf(bio_err, "bufsize=%d\n", bsize);
 315
 316     strbuf = app_malloc(SIZE, "strbuf");
 317     buff = app_malloc(EVP_ENCODE_LENGTH(bsize), "evp buffer");
 318
 319     if (debug) {
 320         BIO_set_callback(in, BIO_debug_callback);
 321         BIO_set_callback(out, BIO_debug_callback);
 322         BIO_set_callback_arg(in, (char *)bio_err);
 323         BIO_set_callback_arg(out, (char *)bio_err);
 324     }
 325
 326     if (infile == NULL) {
 327         unbuffer(stdin);
 328         in = dup_bio_in();
 329     } else
 330         in = bio_open_default(infile, "r");
 331     if (in == NULL)
 332         goto end;
 333
 334     if (!str && passarg) {
 335         if (!app_passwd(passarg, NULL, &pass, NULL)) {
 336             BIO_printf(bio_err, "Error getting password\n");
 337             goto end;
 338         }
 339         str = pass;
 340     }
 341
 342     if ((str == NULL) && (cipher != NULL) && (hkey == NULL)) {
 343         for (;;) {
 344             char prompt[200];
 345
 346             BIO_snprintf(prompt, sizeof prompt, "enter %s %s password:",
 347                          OBJ_nid2ln(EVP_CIPHER_nid(cipher)),
 348                          (enc) ? "encryption" : "decryption");
 349             strbuf[0] = '\0';
 350             i = EVP_read_pw_string((char *)strbuf, SIZE, prompt, enc);
 351             if (i == 0) {
 352                 if (strbuf[0] == '\0') {
 353                     ret = 1;
 354                     goto end;
 355                 }
 356                 str = strbuf;
 357                 break;
 358             }
 359             if (i < 0) {
 360                 BIO_printf(bio_err, "bad password read\n");
 361                 goto end;
 362             }
 363         }
 364     }
 365
 366     out = bio_open_default(outfile, "w");
 367     if (out == NULL)
 368         goto end;
 369
 370     rbio = in;
 371     wbio = out;
 372
 373 #ifdef ZLIB
 374     if (do_zlib) {
 375         if ((bzl = BIO_new(BIO_f_zlib())) == NULL)
 376             goto end;
 377         if (enc)
 378             wbio = BIO_push(bzl, wbio);
 379         else
 380             rbio = BIO_push(bzl, rbio);
 381     }
 382 #endif
 383
 384     if (base64) {
 385         if ((b64 = BIO_new(BIO_f_base64())) == NULL)
 386             goto end;
 387         if (debug) {
 388             BIO_set_callback(b64, BIO_debug_callback);
 389             BIO_set_callback_arg(b64, (char *)bio_err);
 390         }
 391         if (olb64)
 392             BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
 393         if (enc)
 394             wbio = BIO_push(b64, wbio);
 395         else
 396             rbio = BIO_push(b64, rbio);
 397     }
 398
 399     if (cipher != NULL) {
 400         /*
 401          * Note that str is NULL if a key was passed on the command line, so
 402          * we get no salt in that case. Is this a bug?
 403          */
 404         if (str != NULL) {
 405             /*
 406              * Salt handling: if encrypting generate a salt and write to
 407              * output BIO. If decrypting read salt from input BIO.
 408              */
 409             unsigned char *sptr;
 410             if (nosalt)
 411                 sptr = NULL;
 412             else {
 413                 if (enc) {
 414                     if (hsalt) {
 415                         if (!set_hex(hsalt, salt, sizeof salt)) {
 416                             BIO_printf(bio_err, "invalid hex salt value\n");
 417                             goto end;
 418                         }
 419                     } else if (RAND_bytes(salt, sizeof salt) <= 0)
 420                         goto end;
 421                     /*
 422                      * If -P option then don't bother writing
 423                      */
 424                     if ((printkey != 2)
 425                         && (BIO_write(wbio, magic,
 426                                       sizeof magic - 1) != sizeof magic - 1
 427                             || BIO_write(wbio,
 428                                          (char *)salt,
 429                                          sizeof salt) != sizeof salt)) {
 430                         BIO_printf(bio_err, "error writing output file\n");
 431                         goto end;
 432                     }
 433                 } else if (BIO_read(rbio, mbuf, sizeof mbuf) != sizeof mbuf
 434                            || BIO_read(rbio,
 435                                        (unsigned char *)salt,
 436                                        sizeof salt) != sizeof salt) {
 437                     BIO_printf(bio_err, "error reading input file\n");
 438                     goto end;
 439                 } else if (memcmp(mbuf, magic, sizeof magic - 1)) {
 440                     BIO_printf(bio_err, "bad magic number\n");
 441                     goto end;
 442                 }
 443
 444                 sptr = salt;
 445             }
 446
 447             if (!EVP_BytesToKey(cipher, dgst, sptr,
 448                                 (unsigned char *)str,
 449                                 strlen(str), 1, key, iv)) {
 450                 BIO_printf(bio_err, "EVP_BytesToKey failed\n");
 451                 goto end;
 452             }
 453             /*
 454              * zero the complete buffer or the string passed from the command
 455              * line bug picked up by Larry J. Hughes Jr. <hughes@indiana.edu>
 456              */
 457             if (str == strbuf)
 458                 OPENSSL_cleanse(str, SIZE);
 459             else
 460                 OPENSSL_cleanse(str, strlen(str));
 461         }
 462         if ((hiv != NULL) && !set_hex(hiv, iv, sizeof iv)) {
 463             BIO_printf(bio_err, "invalid hex iv value\n");
 464             goto end;
 465         }
 466         if ((hiv == NULL) && (str == NULL)
 467             && EVP_CIPHER_iv_length(cipher) != 0) {
 468             /*
 469              * No IV was explicitly set and no IV was generated during
 470              * EVP_BytesToKey. Hence the IV is undefined, making correct
 471              * decryption impossible.
 472              */
 473             BIO_printf(bio_err, "iv undefined\n");
 474             goto end;
 475         }
 476         if ((hkey != NULL) && !set_hex(hkey, key, sizeof key)) {
 477             BIO_printf(bio_err, "invalid hex key value\n");
 478             goto end;
 479         }
 480
 481         if ((benc = BIO_new(BIO_f_cipher())) == NULL)
 482             goto end;
 483
 484         /*
 485          * Since we may be changing parameters work on the encryption context
 486          * rather than calling BIO_set_cipher().
 487          */
 488
 489         BIO_get_cipher_ctx(benc, &ctx);
 490
 491         if (non_fips_allow)
 492             EVP_CIPHER_CTX_set_flags(ctx, EVP_CIPH_FLAG_NON_FIPS_ALLOW);
 493
 494         if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc)) {
 495             BIO_printf(bio_err, "Error setting cipher %s\n",
 496                        EVP_CIPHER_name(cipher));
 497             ERR_print_errors(bio_err);
 498             goto end;
 499         }
 500
 501         if (nopad)
 502             EVP_CIPHER_CTX_set_padding(ctx, 0);
 503
 504         if (!EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, enc)) {
 505             BIO_printf(bio_err, "Error setting cipher %s\n",
 506                        EVP_CIPHER_name(cipher));
 507             ERR_print_errors(bio_err);
 508             goto end;
 509         }
 510
 511         if (debug) {
 512             BIO_set_callback(benc, BIO_debug_callback);
 513             BIO_set_callback_arg(benc, (char *)bio_err);
 514         }
 515
 516         if (printkey) {
 517             if (!nosalt) {
 518                 printf("salt=");
 519                 for (i = 0; i < (int)sizeof(salt); i++)
 520                     printf("%02X", salt[i]);
 521                 printf("\n");
 522             }
 523             if (cipher->key_len > 0) {
 524                 printf("key=");
 525                 for (i = 0; i < cipher->key_len; i++)
 526                     printf("%02X", key[i]);
 527                 printf("\n");
 528             }
 529             if (cipher->iv_len > 0) {
 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                 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         inl = BIO_read(rbio, (char *)buff, bsize);
 548         if (inl <= 0)
 549             break;
 550         if (BIO_write(wbio, (char *)buff, inl) != inl) {
 551             BIO_printf(bio_err, "error writing output file\n");
 552             goto end;
 553         }
 554     }
 555     if (!BIO_flush(wbio)) {
 556         BIO_printf(bio_err, "bad decrypt\n");
 557         goto end;
 558     }
 559
 560     ret = 0;
 561     if (verbose) {
 562         BIO_printf(bio_err, "bytes read   :%8ld\n", BIO_number_read(in));
 563         BIO_printf(bio_err, "bytes written:%8ld\n", BIO_number_written(out));
 564     }
 565  end:
 566     ERR_print_errors(bio_err);
 567     if (strbuf != NULL)
 568         OPENSSL_free(strbuf);
 569     if (buff != NULL)
 570         OPENSSL_free(buff);
 571     BIO_free(in);
 572     BIO_free_all(out);
 573     BIO_free(benc);
 574     BIO_free(b64);
 575 #ifdef ZLIB
 576     BIO_free(bzl);
 577 #endif
 578     if (pass)
 579         OPENSSL_free(pass);
 580     return (ret);
 581 }
 582
 583 static void show_ciphers(const OBJ_NAME *name, void *bio_)
 584 {
 585     BIO *bio = bio_;
 586     static int n;
 587
 588     if (!islower((unsigned char)*name->name))
 589         return;
 590
 591     BIO_printf(bio, "-%-25s", name->name);
 592     if (++n == 3) {
 593         BIO_printf(bio, "\n");
 594         n = 0;
 595     } else
 596         BIO_printf(bio, " ");
 597 }
 598
 599 static int set_hex(char *in, unsigned char *out, int size)
 600 {
 601     int i, n;
 602     unsigned char j;
 603
 604     n = strlen(in);
 605     if (n > (size * 2)) {
 606         BIO_printf(bio_err, "hex string is too long\n");
 607         return (0);
 608     }
 609     memset(out, 0, size);
 610     for (i = 0; i < n; i++) {
 611         j = (unsigned char)*in;
 612         *(in++) = '\0';
 613         if (j == 0)
 614             break;
 615         if (!isxdigit(j)) {
 616             BIO_printf(bio_err, "non-hex digit\n");
 617             return (0);
 618         }
 619         j = (unsigned char)app_hex(j);
 620         if (i & 1)
 621             out[i / 2] |= j;
 622         else
 623             out[i / 2] = (j << 4);
 624     }
 625     return (1);
 626 }