apps/enc.c

   1 /*
   2  * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <limits.h>
  14 #include "apps.h"
  15 #include "progs.h"
  16 #include <openssl/bio.h>
  17 #include <openssl/err.h>
  18 #include <openssl/evp.h>
  19 #include <openssl/objects.h>
  20 #include <openssl/x509.h>
  21 #include <openssl/rand.h>
  22 #include <openssl/pem.h>
  23 #ifndef OPENSSL_NO_COMP
  24 # include <openssl/comp.h>
  25 #endif
  26 #include <ctype.h>
  27
  28 #undef SIZE
  29 #undef BSIZE
  30 #define SIZE    (512)
  31 #define BSIZE   (8*1024)
  32
  33 static int set_hex(const char *in, unsigned char *out, int size);
  34 static void show_ciphers(const OBJ_NAME *name, void *bio_);
  35
  36 struct doall_enc_ciphers {
  37     BIO *bio;
  38     int n;
  39 };
  40
  41 typedef enum OPTION_choice {
  42     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  43     OPT_LIST,
  44     OPT_E, OPT_IN, OPT_OUT, OPT_PASS, OPT_ENGINE, OPT_D, OPT_P, OPT_V,
  45     OPT_NOPAD, OPT_SALT, OPT_NOSALT, OPT_DEBUG, OPT_UPPER_P, OPT_UPPER_A,
  46     OPT_A, OPT_Z, OPT_BUFSIZE, OPT_K, OPT_KFILE, OPT_UPPER_K, OPT_NONE,
  47     OPT_UPPER_S, OPT_IV, OPT_MD, OPT_ITER, OPT_PBKDF2, OPT_CIPHER,
  48     OPT_R_ENUM
  49 } OPTION_CHOICE;
  50
  51 const OPTIONS enc_options[] = {
  52     {"help", OPT_HELP, '-', "Display this summary"},
  53     {"list", OPT_LIST, '-', "List ciphers"},
  54 #if !OPENSSL_API_3
  55     {"ciphers", OPT_LIST, '-', "Alias for -list"},
  56 #endif
  57     {"in", OPT_IN, '<', "Input file"},
  58     {"out", OPT_OUT, '>', "Output file"},
  59     {"pass", OPT_PASS, 's', "Passphrase source"},
  60     {"e", OPT_E, '-', "Encrypt"},
  61     {"d", OPT_D, '-', "Decrypt"},
  62     {"p", OPT_P, '-', "Print the iv/key"},
  63     {"P", OPT_UPPER_P, '-', "Print the iv/key and exit"},
  64     {"v", OPT_V, '-', "Verbose output"},
  65     {"nopad", OPT_NOPAD, '-', "Disable standard block padding"},
  66     {"salt", OPT_SALT, '-', "Use salt in the KDF (default)"},
  67     {"nosalt", OPT_NOSALT, '-', "Do not use salt in the KDF"},
  68     {"debug", OPT_DEBUG, '-', "Print debug info"},
  69     {"a", OPT_A, '-', "Base64 encode/decode, depending on encryption flag"},
  70     {"base64", OPT_A, '-', "Same as option -a"},
  71     {"A", OPT_UPPER_A, '-',
  72      "Used with -[base64|a] to specify base64 buffer as a single line"},
  73     {"bufsize", OPT_BUFSIZE, 's', "Buffer size"},
  74     {"k", OPT_K, 's', "Passphrase"},
  75     {"kfile", OPT_KFILE, '<', "Read passphrase from file"},
  76     {"K", OPT_UPPER_K, 's', "Raw key, in hex"},
  77     {"S", OPT_UPPER_S, 's', "Salt, in hex"},
  78     {"iv", OPT_IV, 's', "IV in hex"},
  79     {"md", OPT_MD, 's', "Use specified digest to create a key from the passphrase"},
  80     {"iter", OPT_ITER, 'p', "Specify the iteration count and force use of PBKDF2"},
  81     {"pbkdf2", OPT_PBKDF2, '-', "Use password-based key derivation function 2"},
  82     {"none", OPT_NONE, '-', "Don't encrypt"},
  83     {"", OPT_CIPHER, '-', "Any supported cipher"},
  84     OPT_R_OPTIONS,
  85 #ifdef ZLIB
  86     {"z", OPT_Z, '-', "Use zlib as the 'encryption'"},
  87 #endif
  88 #ifndef OPENSSL_NO_ENGINE
  89     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  90 #endif
  91     {NULL}
  92 };
  93
  94 int enc_main(int argc, char **argv)
  95 {
  96     static char buf[128];
  97     static const char magic[] = "Salted__";
  98     ENGINE *e = NULL;
  99     BIO *in = NULL, *out = NULL, *b64 = NULL, *benc = NULL, *rbio =
 100         NULL, *wbio = NULL;
 101     EVP_CIPHER_CTX *ctx = NULL;
 102     const EVP_CIPHER *cipher = NULL, *c;
 103     const EVP_MD *dgst = NULL;
 104     char *hkey = NULL, *hiv = NULL, *hsalt = NULL, *p;
 105     char *infile = NULL, *outfile = NULL, *prog;
 106     char *str = NULL, *passarg = NULL, *pass = NULL, *strbuf = NULL;
 107     char mbuf[sizeof(magic) - 1];
 108     OPTION_CHOICE o;
 109     int bsize = BSIZE, verbose = 0, debug = 0, olb64 = 0, nosalt = 0;
 110     int enc = 1, printkey = 0, i, k;
 111     int base64 = 0, informat = FORMAT_BINARY, outformat = FORMAT_BINARY;
 112     int ret = 1, inl, nopad = 0;
 113     unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
 114     unsigned char *buff = NULL, salt[PKCS5_SALT_LEN];
 115     int pbkdf2 = 0;
 116     int iter = 0;
 117     long n;
 118     struct doall_enc_ciphers dec;
 119 #ifdef ZLIB
 120     int do_zlib = 0;
 121     BIO *bzl = NULL;
 122 #endif
 123
 124     /* first check the program name */
 125     prog = opt_progname(argv[0]);
 126     if (strcmp(prog, "base64") == 0) {
 127         base64 = 1;
 128 #ifdef ZLIB
 129     } else if (strcmp(prog, "zlib") == 0) {
 130         do_zlib = 1;
 131 #endif
 132     } else {
 133         cipher = EVP_get_cipherbyname(prog);
 134         if (cipher == NULL && strcmp(prog, "enc") != 0) {
 135             BIO_printf(bio_err, "%s is not a known cipher\n", prog);
 136             goto end;
 137         }
 138     }
 139
 140     prog = opt_init(argc, argv, enc_options);
 141     while ((o = opt_next()) != OPT_EOF) {
 142         switch (o) {
 143         case OPT_EOF:
 144         case OPT_ERR:
 145  opthelp:
 146             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 147             goto end;
 148         case OPT_HELP:
 149             opt_help(enc_options);
 150             ret = 0;
 151             goto end;
 152         case OPT_LIST:
 153             BIO_printf(bio_out, "Supported ciphers:\n");
 154             dec.bio = bio_out;
 155             dec.n = 0;
 156             OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH,
 157                                    show_ciphers, &dec);
 158             BIO_printf(bio_out, "\n");
 159             ret = 0;
 160             goto end;
 161         case OPT_E:
 162             enc = 1;
 163             break;
 164         case OPT_IN:
 165             infile = opt_arg();
 166             break;
 167         case OPT_OUT:
 168             outfile = opt_arg();
 169             break;
 170         case OPT_PASS:
 171             passarg = opt_arg();
 172             break;
 173         case OPT_ENGINE:
 174             e = setup_engine(opt_arg(), 0);
 175             break;
 176         case OPT_D:
 177             enc = 0;
 178             break;
 179         case OPT_P:
 180             printkey = 1;
 181             break;
 182         case OPT_V:
 183             verbose = 1;
 184             break;
 185         case OPT_NOPAD:
 186             nopad = 1;
 187             break;
 188         case OPT_SALT:
 189             nosalt = 0;
 190             break;
 191         case OPT_NOSALT:
 192             nosalt = 1;
 193             break;
 194         case OPT_DEBUG:
 195             debug = 1;
 196             break;
 197         case OPT_UPPER_P:
 198             printkey = 2;
 199             break;
 200         case OPT_UPPER_A:
 201             olb64 = 1;
 202             break;
 203         case OPT_A:
 204             base64 = 1;
 205             break;
 206         case OPT_Z:
 207 #ifdef ZLIB
 208             do_zlib = 1;
 209 #endif
 210             break;
 211         case OPT_BUFSIZE:
 212             p = opt_arg();
 213             i = (int)strlen(p) - 1;
 214             k = i >= 1 && p[i] == 'k';
 215             if (k)
 216                 p[i] = '\0';
 217             if (!opt_long(opt_arg(), &n)
 218                     || n < 0 || (k && n >= LONG_MAX / 1024))
 219                 goto opthelp;
 220             if (k)
 221                 n *= 1024;
 222             bsize = (int)n;
 223             break;
 224         case OPT_K:
 225             str = opt_arg();
 226             break;
 227         case OPT_KFILE:
 228             in = bio_open_default(opt_arg(), 'r', FORMAT_TEXT);
 229             if (in == NULL)
 230                 goto opthelp;
 231             i = BIO_gets(in, buf, sizeof(buf));
 232             BIO_free(in);
 233             in = NULL;
 234             if (i <= 0) {
 235                 BIO_printf(bio_err,
 236                            "%s Can't read key from %s\n", prog, opt_arg());
 237                 goto opthelp;
 238             }
 239             while (--i > 0 && (buf[i] == '\r' || buf[i] == '\n'))
 240                 buf[i] = '\0';
 241             if (i <= 0) {
 242                 BIO_printf(bio_err, "%s: zero length password\n", prog);
 243                 goto opthelp;
 244             }
 245             str = buf;
 246             break;
 247         case OPT_UPPER_K:
 248             hkey = opt_arg();
 249             break;
 250         case OPT_UPPER_S:
 251             hsalt = opt_arg();
 252             break;
 253         case OPT_IV:
 254             hiv = opt_arg();
 255             break;
 256         case OPT_MD:
 257             if (!opt_md(opt_arg(), &dgst))
 258                 goto opthelp;
 259             break;
 260         case OPT_CIPHER:
 261             if (!opt_cipher(opt_unknown(), &c))
 262                 goto opthelp;
 263             cipher = c;
 264             break;
 265         case OPT_ITER:
 266             if (!opt_int(opt_arg(), &iter))
 267                 goto opthelp;
 268             pbkdf2 = 1;
 269             break;
 270         case OPT_PBKDF2:
 271             pbkdf2 = 1;
 272             if (iter == 0)    /* do not overwrite a chosen value */
 273                 iter = 10000;
 274             break;
 275         case OPT_NONE:
 276             cipher = NULL;
 277             break;
 278         case OPT_R_CASES:
 279             if (!opt_rand(o))
 280                 goto end;
 281             break;
 282         }
 283     }
 284     if (opt_num_rest() != 0) {
 285         BIO_printf(bio_err, "Extra arguments given.\n");
 286         goto opthelp;
 287     }
 288
 289     if (cipher && EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) {
 290         BIO_printf(bio_err, "%s: AEAD ciphers not supported\n", prog);
 291         goto end;
 292     }
 293
 294     if (cipher && (EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)) {
 295         BIO_printf(bio_err, "%s XTS ciphers not supported\n", prog);
 296         goto end;
 297     }
 298
 299     if (dgst == NULL)
 300         dgst = EVP_sha256();
 301
 302     if (iter == 0)
 303         iter = 1;
 304
 305     /* It must be large enough for a base64 encoded line */
 306     if (base64 && bsize < 80)
 307         bsize = 80;
 308     if (verbose)
 309         BIO_printf(bio_err, "bufsize=%d\n", bsize);
 310
 311 #ifdef ZLIB
 312     if (!do_zlib)
 313 #endif
 314         if (base64) {
 315             if (enc)
 316                 outformat = FORMAT_BASE64;
 317             else
 318                 informat = FORMAT_BASE64;
 319         }
 320
 321     strbuf = app_malloc(SIZE, "strbuf");
 322     buff = app_malloc(EVP_ENCODE_LENGTH(bsize), "evp buffer");
 323
 324     if (infile == NULL) {
 325         in = dup_bio_in(informat);
 326     } else {
 327         in = bio_open_default(infile, 'r', informat);
 328     }
 329     if (in == NULL)
 330         goto end;
 331
 332     if (str == NULL && passarg != NULL) {
 333         if (!app_passwd(passarg, NULL, &pass, NULL)) {
 334             BIO_printf(bio_err, "Error getting password\n");
 335             goto end;
 336         }
 337         str = pass;
 338     }
 339
 340     if ((str == NULL) && (cipher != NULL) && (hkey == NULL)) {
 341         if (1) {
 342 #ifndef OPENSSL_NO_UI_CONSOLE
 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         } else {
 365 #endif
 366             BIO_printf(bio_err, "password required\n");
 367             goto end;
 368         }
 369     }
 370
 371     out = bio_open_default(outfile, 'w', outformat);
 372     if (out == NULL)
 373         goto end;
 374
 375     if (debug) {
 376         BIO_set_callback(in, BIO_debug_callback);
 377         BIO_set_callback(out, BIO_debug_callback);
 378         BIO_set_callback_arg(in, (char *)bio_err);
 379         BIO_set_callback_arg(out, (char *)bio_err);
 380     }
 381
 382     rbio = in;
 383     wbio = out;
 384
 385 #ifdef ZLIB
 386     if (do_zlib) {
 387         if ((bzl = BIO_new(BIO_f_zlib())) == NULL)
 388             goto end;
 389         if (debug) {
 390             BIO_set_callback(bzl, BIO_debug_callback);
 391             BIO_set_callback_arg(bzl, (char *)bio_err);
 392         }
 393         if (enc)
 394             wbio = BIO_push(bzl, wbio);
 395         else
 396             rbio = BIO_push(bzl, rbio);
 397     }
 398 #endif
 399
 400     if (base64) {
 401         if ((b64 = BIO_new(BIO_f_base64())) == NULL)
 402             goto end;
 403         if (debug) {
 404             BIO_set_callback(b64, BIO_debug_callback);
 405             BIO_set_callback_arg(b64, (char *)bio_err);
 406         }
 407         if (olb64)
 408             BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
 409         if (enc)
 410             wbio = BIO_push(b64, wbio);
 411         else
 412             rbio = BIO_push(b64, rbio);
 413     }
 414
 415     if (cipher != NULL) {
 416         /*
 417          * Note that str is NULL if a key was passed on the command line, so
 418          * we get no salt in that case. Is this a bug?
 419          */
 420         if (str != NULL) {
 421             /*
 422              * Salt handling: if encrypting generate a salt and write to
 423              * output BIO. If decrypting read salt from input BIO.
 424              */
 425             unsigned char *sptr;
 426             size_t str_len = strlen(str);
 427
 428             if (nosalt) {
 429                 sptr = NULL;
 430             } else {
 431                 if (enc) {
 432                     if (hsalt) {
 433                         if (!set_hex(hsalt, salt, sizeof(salt))) {
 434                             BIO_printf(bio_err, "invalid hex salt value\n");
 435                             goto end;
 436                         }
 437                     } else if (RAND_bytes(salt, sizeof(salt)) <= 0) {
 438                         goto end;
 439                     }
 440                     /*
 441                      * If -P option then don't bother writing
 442                      */
 443                     if ((printkey != 2)
 444                         && (BIO_write(wbio, magic,
 445                                       sizeof(magic) - 1) != sizeof(magic) - 1
 446                             || BIO_write(wbio,
 447                                          (char *)salt,
 448                                          sizeof(salt)) != sizeof(salt))) {
 449                         BIO_printf(bio_err, "error writing output file\n");
 450                         goto end;
 451                     }
 452                 } else if (BIO_read(rbio, mbuf, sizeof(mbuf)) != sizeof(mbuf)
 453                            || BIO_read(rbio,
 454                                        (unsigned char *)salt,
 455                                        sizeof(salt)) != sizeof(salt)) {
 456                     BIO_printf(bio_err, "error reading input file\n");
 457                     goto end;
 458                 } else if (memcmp(mbuf, magic, sizeof(magic) - 1)) {
 459                     BIO_printf(bio_err, "bad magic number\n");
 460                     goto end;
 461                 }
 462                 sptr = salt;
 463             }
 464
 465             if (pbkdf2 == 1) {
 466                 /*
 467                 * derive key and default iv
 468                 * concatenated into a temporary buffer
 469                 */
 470                 unsigned char tmpkeyiv[EVP_MAX_KEY_LENGTH + EVP_MAX_IV_LENGTH];
 471                 int iklen = EVP_CIPHER_key_length(cipher);
 472                 int ivlen = EVP_CIPHER_iv_length(cipher);
 473                 /* not needed if HASH_UPDATE() is fixed : */
 474                 int islen = (sptr != NULL ? sizeof(salt) : 0);
 475                 if (!PKCS5_PBKDF2_HMAC(str, str_len, sptr, islen,
 476                                        iter, dgst, iklen+ivlen, tmpkeyiv)) {
 477                     BIO_printf(bio_err, "PKCS5_PBKDF2_HMAC failed\n");
 478                     goto end;
 479                 }
 480                 /* split and move data back to global buffer */
 481                 memcpy(key, tmpkeyiv, iklen);
 482                 memcpy(iv, tmpkeyiv+iklen, ivlen);
 483             } else {
 484                 BIO_printf(bio_err, "*** WARNING : "
 485                                     "deprecated key derivation used.\n"
 486                                     "Using -iter or -pbkdf2 would be better.\n");
 487                 if (!EVP_BytesToKey(cipher, dgst, sptr,
 488                                     (unsigned char *)str, str_len,
 489                                     1, key, iv)) {
 490                     BIO_printf(bio_err, "EVP_BytesToKey failed\n");
 491                     goto end;
 492                 }
 493             }
 494             /*
 495              * zero the complete buffer or the string passed from the command
 496              * line.
 497              */
 498             if (str == strbuf)
 499                 OPENSSL_cleanse(str, SIZE);
 500             else
 501                 OPENSSL_cleanse(str, str_len);
 502         }
 503         if (hiv != NULL) {
 504             int siz = EVP_CIPHER_iv_length(cipher);
 505             if (siz == 0) {
 506                 BIO_printf(bio_err, "warning: iv not used by this cipher\n");
 507             } else if (!set_hex(hiv, iv, siz)) {
 508                 BIO_printf(bio_err, "invalid hex iv value\n");
 509                 goto end;
 510             }
 511         }
 512         if ((hiv == NULL) && (str == NULL)
 513             && EVP_CIPHER_iv_length(cipher) != 0) {
 514             /*
 515              * No IV was explicitly set and no IV was generated.
 516              * Hence the IV is undefined, making correct decryption impossible.
 517              */
 518             BIO_printf(bio_err, "iv undefined\n");
 519             goto end;
 520         }
 521         if (hkey != NULL) {
 522             if (!set_hex(hkey, key, EVP_CIPHER_key_length(cipher))) {
 523                 BIO_printf(bio_err, "invalid hex key value\n");
 524                 goto end;
 525             }
 526             /* wiping secret data as we no longer need it */
 527             OPENSSL_cleanse(hkey, strlen(hkey));
 528         }
 529
 530         if ((benc = BIO_new(BIO_f_cipher())) == NULL)
 531             goto end;
 532
 533         /*
 534          * Since we may be changing parameters work on the encryption context
 535          * rather than calling BIO_set_cipher().
 536          */
 537
 538         BIO_get_cipher_ctx(benc, &ctx);
 539
 540         if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc)) {
 541             BIO_printf(bio_err, "Error setting cipher %s\n",
 542                        EVP_CIPHER_name(cipher));
 543             ERR_print_errors(bio_err);
 544             goto end;
 545         }
 546
 547         if (nopad)
 548             EVP_CIPHER_CTX_set_padding(ctx, 0);
 549
 550         if (!EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, enc)) {
 551             BIO_printf(bio_err, "Error setting cipher %s\n",
 552                        EVP_CIPHER_name(cipher));
 553             ERR_print_errors(bio_err);
 554             goto end;
 555         }
 556
 557         if (debug) {
 558             BIO_set_callback(benc, BIO_debug_callback);
 559             BIO_set_callback_arg(benc, (char *)bio_err);
 560         }
 561
 562         if (printkey) {
 563             if (!nosalt) {
 564                 printf("salt=");
 565                 for (i = 0; i < (int)sizeof(salt); i++)
 566                     printf("%02X", salt[i]);
 567                 printf("\n");
 568             }
 569             if (EVP_CIPHER_key_length(cipher) > 0) {
 570                 printf("key=");
 571                 for (i = 0; i < EVP_CIPHER_key_length(cipher); i++)
 572                     printf("%02X", key[i]);
 573                 printf("\n");
 574             }
 575             if (EVP_CIPHER_iv_length(cipher) > 0) {
 576                 printf("iv =");
 577                 for (i = 0; i < EVP_CIPHER_iv_length(cipher); i++)
 578                     printf("%02X", iv[i]);
 579                 printf("\n");
 580             }
 581             if (printkey == 2) {
 582                 ret = 0;
 583                 goto end;
 584             }
 585         }
 586     }
 587
 588     /* Only encrypt/decrypt as we write the file */
 589     if (benc != NULL)
 590         wbio = BIO_push(benc, wbio);
 591
 592     while (BIO_pending(rbio) || !BIO_eof(rbio)) {
 593         inl = BIO_read(rbio, (char *)buff, bsize);
 594         if (inl <= 0)
 595             break;
 596         if (BIO_write(wbio, (char *)buff, inl) != inl) {
 597             BIO_printf(bio_err, "error writing output file\n");
 598             goto end;
 599         }
 600     }
 601     if (!BIO_flush(wbio)) {
 602         BIO_printf(bio_err, "bad decrypt\n");
 603         goto end;
 604     }
 605
 606     ret = 0;
 607     if (verbose) {
 608         BIO_printf(bio_err, "bytes read   : %8ju\n", BIO_number_read(in));
 609         BIO_printf(bio_err, "bytes written: %8ju\n", BIO_number_written(out));
 610     }
 611  end:
 612     ERR_print_errors(bio_err);
 613     OPENSSL_free(strbuf);
 614     OPENSSL_free(buff);
 615     BIO_free(in);
 616     BIO_free_all(out);
 617     BIO_free(benc);
 618     BIO_free(b64);
 619 #ifdef ZLIB
 620     BIO_free(bzl);
 621 #endif
 622     release_engine(e);
 623     OPENSSL_free(pass);
 624     return ret;
 625 }
 626
 627 static void show_ciphers(const OBJ_NAME *name, void *arg)
 628 {
 629     struct doall_enc_ciphers *dec = (struct doall_enc_ciphers *)arg;
 630     const EVP_CIPHER *cipher;
 631
 632     if (!islower((unsigned char)*name->name))
 633         return;
 634
 635     /* Filter out ciphers that we cannot use */
 636     cipher = EVP_get_cipherbyname(name->name);
 637     if (cipher == NULL ||
 638             (EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) != 0 ||
 639             EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)
 640         return;
 641
 642     BIO_printf(dec->bio, "-%-25s", name->name);
 643     if (++dec->n == 3) {
 644         BIO_printf(dec->bio, "\n");
 645         dec->n = 0;
 646     } else
 647         BIO_printf(dec->bio, " ");
 648 }
 649
 650 static int set_hex(const char *in, unsigned char *out, int size)
 651 {
 652     int i, n;
 653     unsigned char j;
 654
 655     i = size * 2;
 656     n = strlen(in);
 657     if (n > i) {
 658         BIO_printf(bio_err, "hex string is too long, ignoring excess\n");
 659         n = i; /* ignore exceeding part */
 660     } else if (n < i) {
 661         BIO_printf(bio_err, "hex string is too short, padding with zero bytes to length\n");
 662     }
 663
 664     memset(out, 0, size);
 665     for (i = 0; i < n; i++) {
 666         j = (unsigned char)*in++;
 667         if (!isxdigit(j)) {
 668             BIO_printf(bio_err, "non-hex digit\n");
 669             return 0;
 670         }
 671         j = (unsigned char)OPENSSL_hexchar2int(j);
 672         if (i & 1)
 673             out[i / 2] |= j;
 674         else
 675             out[i / 2] = (j << 4);
 676     }
 677     return 1;
 678 }