text: /* apps/enc.c */
  /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   * All rights reserved.
   *
   * This package is an SSL implementation written
   * by Eric Young (eay@cryptsoft.com).
   * The implementation was written so as to conform with Netscapes SSL.
   *
   * This library is free for commercial and non-commercial use as long as
   * the following conditions are aheared to.  The following conditions
   * apply to all code found in this distribution, be it the RC4, RSA,
   * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
   * included with this distribution is covered by the same copyright terms
   * except that the holder is Tim Hudson (tjh@cryptsoft.com).
   *
   * Copyright remains Eric Young's, and as such any Copyright notices in
   * the code are not to be removed.
   * If this package is used in a product, Eric Young should be given attribution
   * as the author of the parts of the library used.
   * This can be in the form of a textual message at program startup or
   * in documentation (online or textual) provided with the package.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *    "This product includes cryptographic software written by
   *     Eric Young (eay@cryptsoft.com)"
   *    The word 'cryptographic' can be left out if the rouines from the library
   *    being used are not cryptographic related :-).
   * 4. If you include any Windows specific code (or a derivative thereof) from
   *    the apps directory (application code) you must include an acknowledgement:
   *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
   *
   * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * The licence and distribution terms for any publically available version or
   * derivative of this code cannot be changed.  i.e. this code cannot simply be
   * copied and put under another distribution licence
   * [including the GNU Public Licence.]
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include "apps.h"
  #include <openssl/bio.h>
  #include <openssl/err.h>
  #include <openssl/evp.h>
  #include <openssl/objects.h>
  #include <openssl/x509.h>
  #include <openssl/rand.h>
  #include <openssl/pem.h>
  #ifndef OPENSSL_NO_COMP
  # include <openssl/comp.h>
  #endif
  #include <ctype.h>
  
  int set_hex(char *in, unsigned char *out, int size);
  #undef SIZE
  #undef BSIZE
  #undef PROG
  
  #define SIZE    (512)
  #define BSIZE   (8*1024)
  #define PROG    enc_main
  
  static void show_ciphers(const OBJ_NAME *name, void *bio_)
  {
      BIO *bio = bio_;
      static int n;
  
      if (!islower((unsigned char)*name->name))
          return;
  
      BIO_printf(bio, "-%-25s", name->name);
      if (++n == 3) {
          BIO_printf(bio, "\n");
          n = 0;
      } else
          BIO_printf(bio, " ");
  }
  
  int MAIN(int, char **);
  
  int MAIN(int argc, char **argv)
  {
      static const char magic[] = "Salted__";
      char mbuf[sizeof magic - 1];
      char *strbuf = NULL;
      unsigned char *buff = NULL, *bufsize = NULL;
      int bsize = BSIZE, verbose = 0;
      int ret = 1, inl;
      int nopad = 0;
      unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
      unsigned char salt[PKCS5_SALT_LEN];
      char *str = NULL, *passarg = NULL, *pass = NULL;
      char *hkey = NULL, *hiv = NULL, *hsalt = NULL;
      char *md = NULL;
      int enc = 1, printkey = 0, i, base64 = 0;
  #ifdef ZLIB
      int do_zlib = 0;
      BIO *bzl = NULL;
  #endif
      int debug = 0, olb64 = 0, nosalt = 0;
      const EVP_CIPHER *cipher = NULL, *c;
      EVP_CIPHER_CTX *ctx = NULL;
      char *inf = NULL, *outf = NULL;
      BIO *in = NULL, *out = NULL, *b64 = NULL, *benc = NULL, *rbio =
          NULL, *wbio = NULL;
  #define PROG_NAME_SIZE  39
      char pname[PROG_NAME_SIZE + 1];
  #ifndef OPENSSL_NO_ENGINE
      char *engine = NULL;
  #endif
      const EVP_MD *dgst = NULL;
      int non_fips_allow = 0;
  
      apps_startup();
  
      if (bio_err == NULL)
          if ((bio_err = BIO_new(BIO_s_file())) != NULL)
              BIO_set_fp(bio_err, stderr, BIO_NOCLOSE | BIO_FP_TEXT);
  
      if (!load_config(bio_err, NULL))
          goto end;
  
      /* first check the program name */
      program_name(argv[0], pname, sizeof pname);
      if (strcmp(pname, "base64") == 0)
          base64 = 1;
  #ifdef ZLIB
      if (strcmp(pname, "zlib") == 0)
          do_zlib = 1;
  #endif
  
      cipher = EVP_get_cipherbyname(pname);
  #ifdef ZLIB
      if (!do_zlib && !base64 && (cipher == NULL)
          && (strcmp(pname, "enc") != 0))
  #else
      if (!base64 && (cipher == NULL) && (strcmp(pname, "enc") != 0))
  #endif
      {
          BIO_printf(bio_err, "%s is an unknown cipher\n", pname);
          goto bad;
      }
  
      argc--;
      argv++;
      while (argc >= 1) {
          if (strcmp(*argv, "-e") == 0)
              enc = 1;
          else if (strcmp(*argv, "-in") == 0) {
              if (--argc < 1)
                  goto bad;
              inf = *(++argv);
          } else if (strcmp(*argv, "-out") == 0) {
              if (--argc < 1)
                  goto bad;
              outf = *(++argv);
          } else if (strcmp(*argv, "-pass") == 0) {
              if (--argc < 1)
                  goto bad;
              passarg = *(++argv);
          }
  #ifndef OPENSSL_NO_ENGINE
          else if (strcmp(*argv, "-engine") == 0) {
              if (--argc < 1)
                  goto bad;
              engine = *(++argv);
          }
  #endif
          else if (strcmp(*argv, "-d") == 0)
              enc = 0;
          else if (strcmp(*argv, "-p") == 0)
              printkey = 1;
          else if (strcmp(*argv, "-v") == 0)
              verbose = 1;
          else if (strcmp(*argv, "-nopad") == 0)
              nopad = 1;
          else if (strcmp(*argv, "-salt") == 0)
              nosalt = 0;
          else if (strcmp(*argv, "-nosalt") == 0)
              nosalt = 1;
          else if (strcmp(*argv, "-debug") == 0)
              debug = 1;
          else if (strcmp(*argv, "-P") == 0)
              printkey = 2;
          else if (strcmp(*argv, "-A") == 0)
              olb64 = 1;
          else if (strcmp(*argv, "-a") == 0)
              base64 = 1;
          else if (strcmp(*argv, "-base64") == 0)
              base64 = 1;
  #ifdef ZLIB
          else if (strcmp(*argv, "-z") == 0)
              do_zlib = 1;
  #endif
          else if (strcmp(*argv, "-bufsize") == 0) {
              if (--argc < 1)
                  goto bad;
              bufsize = (unsigned char *)*(++argv);
          } else if (strcmp(*argv, "-k") == 0) {
              if (--argc < 1)
                  goto bad;
              str = *(++argv);
          } else if (strcmp(*argv, "-kfile") == 0) {
              static char buf[128];
              FILE *infile;
              char *file;
  
              if (--argc < 1)
                  goto bad;
              file = *(++argv);
              infile = fopen(file, "r");
              if (infile == NULL) {
                  BIO_printf(bio_err, "unable to read key from '%s'\n", file);
                  goto bad;
              }
              buf[0] = '\0';
              if (!fgets(buf, sizeof buf, infile)) {
                  BIO_printf(bio_err, "unable to read key from '%s'\n", file);
                  goto bad;
              }
              fclose(infile);
              i = strlen(buf);
              if ((i > 0) && ((buf[i - 1] == '\n') || (buf[i - 1] == '\r')))
                  buf[--i] = '\0';
              if ((i > 0) && ((buf[i - 1] == '\n') || (buf[i - 1] == '\r')))
                  buf[--i] = '\0';
              if (i < 1) {
                  BIO_printf(bio_err, "zero length password\n");
                  goto bad;
              }
              str = buf;
          } else if (strcmp(*argv, "-K") == 0) {
              if (--argc < 1)
                  goto bad;
              hkey = *(++argv);
          } else if (strcmp(*argv, "-S") == 0) {
              if (--argc < 1)
                  goto bad;
              hsalt = *(++argv);
          } else if (strcmp(*argv, "-iv") == 0) {
              if (--argc < 1)
                  goto bad;
              hiv = *(++argv);
          } else if (strcmp(*argv, "-md") == 0) {
              if (--argc < 1)
                  goto bad;
              md = *(++argv);
          } else if (strcmp(*argv, "-non-fips-allow") == 0)
              non_fips_allow = 1;
          else if ((argv[0][0] == '-') &&
                   ((c = EVP_get_cipherbyname(&(argv[0][1]))) != NULL)) {
              cipher = c;
          } else if (strcmp(*argv, "-none") == 0)
              cipher = NULL;
          else {
              BIO_printf(bio_err, "unknown option '%s'\n", *argv);
   bad:
              BIO_printf(bio_err, "options are\n");
              BIO_printf(bio_err, "%-14s input file\n", "-in <file>");
              BIO_printf(bio_err, "%-14s output file\n", "-out <file>");
              BIO_printf(bio_err, "%-14s pass phrase source\n", "-pass <arg>");
              BIO_printf(bio_err, "%-14s encrypt\n", "-e");
              BIO_printf(bio_err, "%-14s decrypt\n", "-d");
              BIO_printf(bio_err,
                         "%-14s base64 encode/decode, depending on encryption flag\n",
                         "-a/-base64");
              BIO_printf(bio_err, "%-14s passphrase is the next argument\n",
                         "-k");
              BIO_printf(bio_err,
                         "%-14s passphrase is the first line of the file argument\n",
                         "-kfile");
              BIO_printf(bio_err,
                         "%-14s the next argument is the md to use to create a key\n",
                         "-md");
              BIO_printf(bio_err,
                         "%-14s   from a passphrase.  One of md2, md5, sha or sha1\n",
                         "");
              BIO_printf(bio_err, "%-14s salt in hex is the next argument\n",
                         "-S");
              BIO_printf(bio_err, "%-14s key/iv in hex is the next argument\n",
                         "-K/-iv");
              BIO_printf(bio_err, "%-14s print the iv/key (then exit if -P)\n",
                         "-[pP]");
              BIO_printf(bio_err, "%-14s buffer size\n", "-bufsize <n>");
              BIO_printf(bio_err, "%-14s disable standard block padding\n",
                         "-nopad");
  #ifndef OPENSSL_NO_ENGINE
              BIO_printf(bio_err,
                         "%-14s use engine e, possibly a hardware device.\n",
                         "-engine e");
  #endif
  
              BIO_printf(bio_err, "Cipher Types\n");
              OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH,
                                     show_ciphers, bio_err);
              BIO_printf(bio_err, "\n");
  
              goto end;
          }
          argc--;
          argv++;
      }
  
  #ifndef OPENSSL_NO_ENGINE
      setup_engine(bio_err, engine, 0);
  #endif
  
      if (cipher && EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) {
          BIO_printf(bio_err,
                     "AEAD ciphers not supported by the enc utility\n");
          goto end;
      }
  
      if (cipher && (EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)) {
          BIO_printf(bio_err,
                     "Ciphers in XTS mode are not supported by the enc utility\n");
          goto end;
      }
  
      if (md && (dgst = EVP_get_digestbyname(md)) == NULL) {
          BIO_printf(bio_err, "%s is an unsupported message digest type\n", md);
          goto end;
      }
  
      if (dgst == NULL) {
  #ifndef NO_GMSSL
          dgst = EVP_sm3();
  #else
          dgst = EVP_md5();
  #endif
      }
  
      if (bufsize != NULL) {
          unsigned long n;
  
          for (n = 0; *bufsize; bufsize++) {
              i = *bufsize;
              if ((i <= '9') && (i >= '0'))
                  n = n * 10 + i - '0';
              else if (i == 'k') {
                  n *= 1024;
                  bufsize++;
                  break;
              }
          }
          if (*bufsize != '\0') {
              BIO_printf(bio_err, "invalid 'bufsize' specified.\n");
              goto end;
          }
  
          /* It must be large enough for a base64 encoded line */
          if (base64 && n < 80)
              n = 80;
  
          bsize = (int)n;
          if (verbose)
              BIO_printf(bio_err, "bufsize=%d\n", bsize);
      }
  
      strbuf = OPENSSL_malloc(SIZE);
      buff = (unsigned char *)OPENSSL_malloc(EVP_ENCODE_LENGTH(bsize));
      if ((buff == NULL) || (strbuf == NULL)) {
          BIO_printf(bio_err, "OPENSSL_malloc failure %ld\n",
                     (long)EVP_ENCODE_LENGTH(bsize));
          goto end;
      }
  
      in = BIO_new(BIO_s_file());
      out = BIO_new(BIO_s_file());
      if ((in == NULL) || (out == NULL)) {
          ERR_print_errors(bio_err);
          goto end;
      }
      if (debug) {
          BIO_set_callback(in, BIO_debug_callback);
          BIO_set_callback(out, BIO_debug_callback);
          BIO_set_callback_arg(in, (char *)bio_err);
          BIO_set_callback_arg(out, (char *)bio_err);
      }
  
      if (inf == NULL) {
  #ifndef OPENSSL_NO_SETVBUF_IONBF
          if (bufsize != NULL)
              setvbuf(stdin, (char *)NULL, _IONBF, 0);
  #endif                          /* ndef OPENSSL_NO_SETVBUF_IONBF */
          BIO_set_fp(in, stdin, BIO_NOCLOSE);
      } else {
          if (BIO_read_filename(in, inf) <= 0) {
              perror(inf);
              goto end;
          }
      }
  
      if (!str && passarg) {
          if (!app_passwd(bio_err, passarg, NULL, &pass, NULL)) {
              BIO_printf(bio_err, "Error getting password\n");
              goto end;
          }
          str = pass;
      }
  
      if ((str == NULL) && (cipher != NULL) && (hkey == NULL)) {
          for (;;) {
              char buf[200];
  
              BIO_snprintf(buf, sizeof buf, "enter %s %s password:",
                           OBJ_nid2ln(EVP_CIPHER_nid(cipher)),
                           (enc) ? "encryption" : "decryption");
              strbuf[0] = '\0';
              i = EVP_read_pw_string((char *)strbuf, SIZE, buf, enc);
              if (i == 0) {
                  if (strbuf[0] == '\0') {
                      ret = 1;
                      goto end;
                  }
                  str = strbuf;
                  break;
              }
              if (i < 0) {
                  BIO_printf(bio_err, "bad password read\n");
                  goto end;
              }
          }
      }
  
      if (outf == NULL) {
          BIO_set_fp(out, stdout, BIO_NOCLOSE);
  #ifndef OPENSSL_NO_SETVBUF_IONBF
          if (bufsize != NULL)
              setvbuf(stdout, (char *)NULL, _IONBF, 0);
  #endif                          /* ndef OPENSSL_NO_SETVBUF_IONBF */
  #ifdef OPENSSL_SYS_VMS
          {
              BIO *tmpbio = BIO_new(BIO_f_linebuffer());
              out = BIO_push(tmpbio, out);
          }
  #endif
      } else {
          if (BIO_write_filename(out, outf) <= 0) {
              perror(outf);
              goto end;
          }
      }
  
      rbio = in;
      wbio = out;
  
  #ifdef ZLIB
  
      if (do_zlib) {
          if ((bzl = BIO_new(BIO_f_zlib())) == NULL)
              goto end;
          if (enc)
              wbio = BIO_push(bzl, wbio);
          else
              rbio = BIO_push(bzl, rbio);
      }
  #endif
  
      if (base64) {
          if ((b64 = BIO_new(BIO_f_base64())) == NULL)
              goto end;
          if (debug) {
              BIO_set_callback(b64, BIO_debug_callback);
              BIO_set_callback_arg(b64, (char *)bio_err);
          }
          if (olb64)
              BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
          if (enc)
              wbio = BIO_push(b64, wbio);
          else
              rbio = BIO_push(b64, rbio);
      }
  
      if (cipher != NULL) {
          /*
           * Note that str is NULL if a key was passed on the command line, so
           * we get no salt in that case. Is this a bug?
           */
          if (str != NULL) {
              /*
               * Salt handling: if encrypting generate a salt and write to
               * output BIO. If decrypting read salt from input BIO.
               */
              unsigned char *sptr;
              if (nosalt)
                  sptr = NULL;
              else {
                  if (enc) {
                      if (hsalt) {
                          if (!set_hex(hsalt, salt, sizeof salt)) {
                              BIO_printf(bio_err, "invalid hex salt value\n");
                              goto end;
                          }
                      } else if (RAND_pseudo_bytes(salt, sizeof salt) < 0)
                          goto end;
                      /*
                       * If -P option then don't bother writing
                       */
                      if ((printkey != 2)
                          && (BIO_write(wbio, magic,
                                        sizeof magic - 1) != sizeof magic - 1
                              || BIO_write(wbio,
                                           (char *)salt,
                                           sizeof salt) != sizeof salt)) {
                          BIO_printf(bio_err, "error writing output file\n");
                          goto end;
                      }
                  } else if (BIO_read(rbio, mbuf, sizeof mbuf) != sizeof mbuf
                             || BIO_read(rbio,
                                         (unsigned char *)salt,
                                         sizeof salt) != sizeof salt) {
                      BIO_printf(bio_err, "error reading input file\n");
                      goto end;
                  } else if (memcmp(mbuf, magic, sizeof magic - 1)) {
                      BIO_printf(bio_err, "bad magic number\n");
                      goto end;
                  }
  
                  sptr = salt;
              }
  
              EVP_BytesToKey(cipher, dgst, sptr,
                             (unsigned char *)str, strlen(str), 1, key, iv);
              /*
               * zero the complete buffer or the string passed from the command
               * line bug picked up by Larry J. Hughes Jr. <hughes@indiana.edu>
               */
              if (str == strbuf)
                  OPENSSL_cleanse(str, SIZE);
              else
                  OPENSSL_cleanse(str, strlen(str));
          }
          if (hiv != NULL) {
              int siz = EVP_CIPHER_iv_length(cipher);
              if (siz == 0) {
                  BIO_printf(bio_err, "warning: iv not use by this cipher\n");
              } else if (!set_hex(hiv, iv, sizeof iv)) {
                  BIO_printf(bio_err, "invalid hex iv value\n");
                  goto end;
              }
          }
          if ((hiv == NULL) && (str == NULL)
              && EVP_CIPHER_iv_length(cipher) != 0) {
              /*
               * No IV was explicitly set and no IV was generated during
               * EVP_BytesToKey. Hence the IV is undefined, making correct
               * decryption impossible.
               */
              BIO_printf(bio_err, "iv undefined\n");
              goto end;
          }
          if ((hkey != NULL) && !set_hex(hkey, key, EVP_CIPHER_key_length(cipher))) {
              BIO_printf(bio_err, "invalid hex key value\n");
              goto end;
          }
  
          if ((benc = BIO_new(BIO_f_cipher())) == NULL)
              goto end;
  
          /*
           * Since we may be changing parameters work on the encryption context
           * rather than calling BIO_set_cipher().
           */
  
          BIO_get_cipher_ctx(benc, &ctx);
  
          if (non_fips_allow)
              EVP_CIPHER_CTX_set_flags(ctx, EVP_CIPH_FLAG_NON_FIPS_ALLOW);
  
          if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc)) {
              BIO_printf(bio_err, "Error setting cipher %s\n",
                         EVP_CIPHER_name(cipher));
              ERR_print_errors(bio_err);
              goto end;
          }
  
          if (nopad)
              EVP_CIPHER_CTX_set_padding(ctx, 0);
  
          if (!EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, enc)) {
              BIO_printf(bio_err, "Error setting cipher %s\n",
                         EVP_CIPHER_name(cipher));
              ERR_print_errors(bio_err);
              goto end;
          }
  
          if (debug) {
              BIO_set_callback(benc, BIO_debug_callback);
              BIO_set_callback_arg(benc, (char *)bio_err);
          }
  
          if (printkey) {
              if (!nosalt) {
                  printf("salt=");
                  for (i = 0; i < (int)sizeof(salt); i++)
                      printf("%02X", salt[i]);
                  printf("\n");
              }
              if (cipher->key_len > 0) {
                  printf("key=");
                  for (i = 0; i < cipher->key_len; i++)
                      printf("%02X", key[i]);
                  printf("\n");
              }
              if (cipher->iv_len > 0) {
                  printf("iv =");
                  for (i = 0; i < cipher->iv_len; i++)
                      printf("%02X", iv[i]);
                  printf("\n");
              }
              if (printkey == 2) {
                  ret = 0;
                  goto end;
              }
          }
      }
  
      /* Only encrypt/decrypt as we write the file */
      if (benc != NULL)
          wbio = BIO_push(benc, wbio);
  
      for (;;) {
          inl = BIO_read(rbio, (char *)buff, bsize);
          if (inl <= 0)
              break;
          if (BIO_write(wbio, (char *)buff, inl) != inl) {
              BIO_printf(bio_err, "error writing output file\n");
              goto end;
          }
      }
      if (!BIO_flush(wbio)) {
          BIO_printf(bio_err, "bad decrypt\n");
          goto end;
      }
  
      ret = 0;
      if (verbose) {
          BIO_printf(bio_err, "bytes read   :%8ld\n", BIO_number_read(in));
          BIO_printf(bio_err, "bytes written:%8ld\n", BIO_number_written(out));
      }
   end:
      ERR_print_errors(bio_err);
      if (strbuf != NULL)
          OPENSSL_free(strbuf);
      if (buff != NULL)
          OPENSSL_free(buff);
      if (in != NULL)
          BIO_free(in);
      if (out != NULL)
          BIO_free_all(out);
      if (benc != NULL)
          BIO_free(benc);
      if (b64 != NULL)
          BIO_free(b64);
  #ifdef ZLIB
      if (bzl != NULL)
          BIO_free(bzl);
  #endif
      if (pass)
          OPENSSL_free(pass);
      apps_shutdown();
      OPENSSL_EXIT(ret);
  }
  
  int set_hex(char *in, unsigned char *out, int size)
  {
      int i, n;
      unsigned char j;
  
      n = strlen(in);
      if (n > (size * 2)) {
          BIO_printf(bio_err, "hex string is too long\n");
          return (0);
      }
      memset(out, 0, size);
      for (i = 0; i < n; i++) {
          j = (unsigned char)*in;
          *(in++) = '\0';
          if (j == 0)
              break;
          if ((j >= '0') && (j <= '9'))
              j -= '0';
          else if ((j >= 'A') && (j <= 'F'))
              j = j - 'A' + 10;
          else if ((j >= 'a') && (j <= 'f'))
              j = j - 'a' + 10;
          else {
              BIO_printf(bio_err, "non-hex digit\n");
              return (0);
          }
          if (i & 1)
              out[i / 2] |= j;
          else
              out[i / 2] = (j << 4);
      }
      return (1);
  }
  