apps/enc.c

   1 /*
   2  * Copyright 1995-2020 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, OPT_PROV_ENUM
  49 } OPTION_CHOICE;
  50
  51 const OPTIONS enc_options[] = {
  52     OPT_SECTION("General"),
  53     {"help", OPT_HELP, '-', "Display this summary"},
  54     {"list", OPT_LIST, '-', "List ciphers"},
  55 #ifndef OPENSSL_NO_DEPRECATED_3_0
  56     {"ciphers", OPT_LIST, '-', "Alias for -list"},
  57 #endif
  58     {"e", OPT_E, '-', "Encrypt"},
  59     {"d", OPT_D, '-', "Decrypt"},
  60     {"p", OPT_P, '-', "Print the iv/key"},
  61     {"P", OPT_UPPER_P, '-', "Print the iv/key and exit"},
  62 #ifndef OPENSSL_NO_ENGINE
  63     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  64 #endif
  65
  66     OPT_SECTION("Input"),
  67     {"in", OPT_IN, '<', "Input file"},
  68     {"k", OPT_K, 's', "Passphrase"},
  69     {"kfile", OPT_KFILE, '<', "Read passphrase from file"},
  70
  71     OPT_SECTION("Output"),
  72     {"out", OPT_OUT, '>', "Output file"},
  73     {"pass", OPT_PASS, 's', "Passphrase source"},
  74     {"v", OPT_V, '-', "Verbose output"},
  75     {"a", OPT_A, '-', "Base64 encode/decode, depending on encryption flag"},
  76     {"base64", OPT_A, '-', "Same as option -a"},
  77     {"A", OPT_UPPER_A, '-',
  78      "Used with -[base64|a] to specify base64 buffer as a single line"},
  79
  80     OPT_SECTION("Encryption"),
  81     {"nopad", OPT_NOPAD, '-', "Disable standard block padding"},
  82     {"salt", OPT_SALT, '-', "Use salt in the KDF (default)"},
  83     {"nosalt", OPT_NOSALT, '-', "Do not use salt in the KDF"},
  84     {"debug", OPT_DEBUG, '-', "Print debug info"},
  85
  86     {"bufsize", OPT_BUFSIZE, 's', "Buffer size"},
  87     {"K", OPT_UPPER_K, 's', "Raw key, in hex"},
  88     {"S", OPT_UPPER_S, 's', "Salt, in hex"},
  89     {"iv", OPT_IV, 's', "IV in hex"},
  90     {"md", OPT_MD, 's', "Use specified digest to create a key from the passphrase"},
  91     {"iter", OPT_ITER, 'p', "Specify the iteration count and force use of PBKDF2"},
  92     {"pbkdf2", OPT_PBKDF2, '-', "Use password-based key derivation function 2"},
  93     {"none", OPT_NONE, '-', "Don't encrypt"},
  94 #ifdef ZLIB
  95     {"z", OPT_Z, '-', "Use zlib as the 'encryption'"},
  96 #endif
  97     {"", OPT_CIPHER, '-', "Any supported cipher"},
  98
  99     OPT_R_OPTIONS,
 100     OPT_PROV_OPTIONS,
 101     {NULL}
 102 };
 103
 104 int enc_main(int argc, char **argv)
 105 {
 106     static char buf[128];
 107     static const char magic[] = "Salted__";
 108     ENGINE *e = NULL;
 109     BIO *in = NULL, *out = NULL, *b64 = NULL, *benc = NULL, *rbio =
 110         NULL, *wbio = NULL;
 111     EVP_CIPHER_CTX *ctx = NULL;
 112     const EVP_CIPHER *cipher = NULL, *c;
 113     const EVP_MD *dgst = NULL;
 114     char *hkey = NULL, *hiv = NULL, *hsalt = NULL, *p;
 115     char *infile = NULL, *outfile = NULL, *prog;
 116     char *str = NULL, *passarg = NULL, *pass = NULL, *strbuf = NULL;
 117     char mbuf[sizeof(magic) - 1];
 118     OPTION_CHOICE o;
 119     int bsize = BSIZE, verbose = 0, debug = 0, olb64 = 0, nosalt = 0;
 120     int enc = 1, printkey = 0, i, k;
 121     int base64 = 0, informat = FORMAT_BINARY, outformat = FORMAT_BINARY;
 122     int ret = 1, inl, nopad = 0;
 123     unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
 124     unsigned char *buff = NULL, salt[PKCS5_SALT_LEN];
 125     int pbkdf2 = 0;
 126     int iter = 0;
 127     long n;
 128     struct doall_enc_ciphers dec;
 129 #ifdef ZLIB
 130     int do_zlib = 0;
 131     BIO *bzl = NULL;
 132 #endif
 133
 134     /* first check the program name */
 135     prog = opt_progname(argv[0]);
 136     if (strcmp(prog, "base64") == 0) {
 137         base64 = 1;
 138 #ifdef ZLIB
 139     } else if (strcmp(prog, "zlib") == 0) {
 140         do_zlib = 1;
 141 #endif
 142     } else {
 143         cipher = EVP_get_cipherbyname(prog);
 144         if (cipher == NULL && strcmp(prog, "enc") != 0) {
 145             BIO_printf(bio_err, "%s is not a known cipher\n", prog);
 146             goto end;
 147         }
 148     }
 149
 150     prog = opt_init(argc, argv, enc_options);
 151     while ((o = opt_next()) != OPT_EOF) {
 152         switch (o) {
 153         case OPT_EOF:
 154         case OPT_ERR:
 155  opthelp:
 156             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 157             goto end;
 158         case OPT_HELP:
 159             opt_help(enc_options);
 160             ret = 0;
 161             goto end;
 162         case OPT_LIST:
 163             BIO_printf(bio_out, "Supported ciphers:\n");
 164             dec.bio = bio_out;
 165             dec.n = 0;
 166             OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH,
 167                                    show_ciphers, &dec);
 168             BIO_printf(bio_out, "\n");
 169             ret = 0;
 170             goto end;
 171         case OPT_E:
 172             enc = 1;
 173             break;
 174         case OPT_IN:
 175             infile = opt_arg();
 176             break;
 177         case OPT_OUT:
 178             outfile = opt_arg();
 179             break;
 180         case OPT_PASS:
 181             passarg = opt_arg();
 182             break;
 183         case OPT_ENGINE:
 184             e = setup_engine(opt_arg(), 0);
 185             break;
 186         case OPT_D:
 187             enc = 0;
 188             break;
 189         case OPT_P:
 190             printkey = 1;
 191             break;
 192         case OPT_V:
 193             verbose = 1;
 194             break;
 195         case OPT_NOPAD:
 196             nopad = 1;
 197             break;
 198         case OPT_SALT:
 199             nosalt = 0;
 200             break;
 201         case OPT_NOSALT:
 202             nosalt = 1;
 203             break;
 204         case OPT_DEBUG:
 205             debug = 1;
 206             break;
 207         case OPT_UPPER_P:
 208             printkey = 2;
 209             break;
 210         case OPT_UPPER_A:
 211             olb64 = 1;
 212             break;
 213         case OPT_A:
 214             base64 = 1;
 215             break;
 216         case OPT_Z:
 217 #ifdef ZLIB
 218             do_zlib = 1;
 219 #endif
 220             break;
 221         case OPT_BUFSIZE:
 222             p = opt_arg();
 223             i = (int)strlen(p) - 1;
 224             k = i >= 1 && p[i] == 'k';
 225             if (k)
 226                 p[i] = '\0';
 227             if (!opt_long(opt_arg(), &n)
 228                     || n < 0 || (k && n >= LONG_MAX / 1024))
 229                 goto opthelp;
 230             if (k)
 231                 n *= 1024;
 232             bsize = (int)n;
 233             break;
 234         case OPT_K:
 235             str = opt_arg();
 236             break;
 237         case OPT_KFILE:
 238             in = bio_open_default(opt_arg(), 'r', FORMAT_TEXT);
 239             if (in == NULL)
 240                 goto opthelp;
 241             i = BIO_gets(in, buf, sizeof(buf));
 242             BIO_free(in);
 243             in = NULL;
 244             if (i <= 0) {
 245                 BIO_printf(bio_err,
 246                            "%s Can't read key from %s\n", prog, opt_arg());
 247                 goto opthelp;
 248             }
 249             while (--i > 0 && (buf[i] == '\r' || buf[i] == '\n'))
 250                 buf[i] = '\0';
 251             if (i <= 0) {
 252                 BIO_printf(bio_err, "%s: zero length password\n", prog);
 253                 goto opthelp;
 254             }
 255             str = buf;
 256             break;
 257         case OPT_UPPER_K:
 258             hkey = opt_arg();
 259             break;
 260         case OPT_UPPER_S:
 261             hsalt = opt_arg();
 262             break;
 263         case OPT_IV:
 264             hiv = opt_arg();
 265             break;
 266         case OPT_MD:
 267             if (!opt_md(opt_arg(), &dgst))
 268                 goto opthelp;
 269             break;
 270         case OPT_CIPHER:
 271             if (!opt_cipher(opt_unknown(), &c))
 272                 goto opthelp;
 273             cipher = c;
 274             break;
 275         case OPT_ITER:
 276             if (!opt_int(opt_arg(), &iter))
 277                 goto opthelp;
 278             pbkdf2 = 1;
 279             break;
 280         case OPT_PBKDF2:
 281             pbkdf2 = 1;
 282             if (iter == 0)    /* do not overwrite a chosen value */
 283                 iter = 10000;
 284             break;
 285         case OPT_NONE:
 286             cipher = NULL;
 287             break;
 288         case OPT_R_CASES:
 289             if (!opt_rand(o))
 290                 goto end;
 291             break;
 292         case OPT_PROV_CASES:
 293             if (!opt_provider(o))
 294                 goto end;
 295             break;
 296         }
 297     }
 298
 299     /* No extra arguments. */
 300     argc = opt_num_rest();
 301     if (argc != 0)
 302         goto opthelp;
 303
 304     if (cipher && EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) {
 305         BIO_printf(bio_err, "%s: AEAD ciphers not supported\n", prog);
 306         goto end;
 307     }
 308
 309     if (cipher && (EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)) {
 310         BIO_printf(bio_err, "%s XTS ciphers not supported\n", prog);
 311         goto end;
 312     }
 313
 314     if (dgst == NULL)
 315         dgst = EVP_sha256();
 316
 317     if (iter == 0)
 318         iter = 1;
 319
 320     /* It must be large enough for a base64 encoded line */
 321     if (base64 && bsize < 80)
 322         bsize = 80;
 323     if (verbose)
 324         BIO_printf(bio_err, "bufsize=%d\n", bsize);
 325
 326 #ifdef ZLIB
 327     if (!do_zlib)
 328 #endif
 329         if (base64) {
 330             if (enc)
 331                 outformat = FORMAT_BASE64;
 332             else
 333                 informat = FORMAT_BASE64;
 334         }
 335
 336     strbuf = app_malloc(SIZE, "strbuf");
 337     buff = app_malloc(EVP_ENCODE_LENGTH(bsize), "evp buffer");
 338
 339     if (infile == NULL) {
 340         in = dup_bio_in(informat);
 341     } else {
 342         in = bio_open_default(infile, 'r', informat);
 343     }
 344     if (in == NULL)
 345         goto end;
 346
 347     if (str == NULL && passarg != NULL) {
 348         if (!app_passwd(passarg, NULL, &pass, NULL)) {
 349             BIO_printf(bio_err, "Error getting password\n");
 350             goto end;
 351         }
 352         str = pass;
 353     }
 354
 355     if ((str == NULL) && (cipher != NULL) && (hkey == NULL)) {
 356         if (1) {
 357 #ifndef OPENSSL_NO_UI_CONSOLE
 358             for (;;) {
 359                 char prompt[200];
 360
 361                 BIO_snprintf(prompt, sizeof(prompt), "enter %s %s password:",
 362                         OBJ_nid2ln(EVP_CIPHER_nid(cipher)),
 363                         (enc) ? "encryption" : "decryption");
 364                 strbuf[0] = '\0';
 365                 i = EVP_read_pw_string((char *)strbuf, SIZE, prompt, enc);
 366                 if (i == 0) {
 367                     if (strbuf[0] == '\0') {
 368                         ret = 1;
 369                         goto end;
 370                     }
 371                     str = strbuf;
 372                     break;
 373                 }
 374                 if (i < 0) {
 375                     BIO_printf(bio_err, "bad password read\n");
 376                     goto end;
 377                 }
 378             }
 379         } else {
 380 #endif
 381             BIO_printf(bio_err, "password required\n");
 382             goto end;
 383         }
 384     }
 385
 386     out = bio_open_default(outfile, 'w', outformat);
 387     if (out == NULL)
 388         goto end;
 389
 390     if (debug) {
 391         BIO_set_callback(in, BIO_debug_callback);
 392         BIO_set_callback(out, BIO_debug_callback);
 393         BIO_set_callback_arg(in, (char *)bio_err);
 394         BIO_set_callback_arg(out, (char *)bio_err);
 395     }
 396
 397     rbio = in;
 398     wbio = out;
 399
 400 #ifdef ZLIB
 401     if (do_zlib) {
 402         if ((bzl = BIO_new(BIO_f_zlib())) == NULL)
 403             goto end;
 404         if (debug) {
 405             BIO_set_callback(bzl, BIO_debug_callback);
 406             BIO_set_callback_arg(bzl, (char *)bio_err);
 407         }
 408         if (enc)
 409             wbio = BIO_push(bzl, wbio);
 410         else
 411             rbio = BIO_push(bzl, rbio);
 412     }
 413 #endif
 414
 415     if (base64) {
 416         if ((b64 = BIO_new(BIO_f_base64())) == NULL)
 417             goto end;
 418         if (debug) {
 419             BIO_set_callback(b64, BIO_debug_callback);
 420             BIO_set_callback_arg(b64, (char *)bio_err);
 421         }
 422         if (olb64)
 423             BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
 424         if (enc)
 425             wbio = BIO_push(b64, wbio);
 426         else
 427             rbio = BIO_push(b64, rbio);
 428     }
 429
 430     if (cipher != NULL) {
 431         /*
 432          * Note that str is NULL if a key was passed on the command line, so
 433          * we get no salt in that case. Is this a bug?
 434          */
 435         if (str != NULL) {
 436             /*
 437              * Salt handling: if encrypting generate a salt and write to
 438              * output BIO. If decrypting read salt from input BIO.
 439              */
 440             unsigned char *sptr;
 441             size_t str_len = strlen(str);
 442
 443             if (nosalt) {
 444                 sptr = NULL;
 445             } else {
 446                 if (enc) {
 447                     if (hsalt) {
 448                         if (!set_hex(hsalt, salt, sizeof(salt))) {
 449                             BIO_printf(bio_err, "invalid hex salt value\n");
 450                             goto end;
 451                         }
 452                     } else if (RAND_bytes(salt, sizeof(salt)) <= 0) {
 453                         goto end;
 454                     }
 455                     /*
 456                      * If -P option then don't bother writing
 457                      */
 458                     if ((printkey != 2)
 459                         && (BIO_write(wbio, magic,
 460                                       sizeof(magic) - 1) != sizeof(magic) - 1
 461                             || BIO_write(wbio,
 462                                          (char *)salt,
 463                                          sizeof(salt)) != sizeof(salt))) {
 464                         BIO_printf(bio_err, "error writing output file\n");
 465                         goto end;
 466                     }
 467                 } else if (BIO_read(rbio, mbuf, sizeof(mbuf)) != sizeof(mbuf)
 468                            || BIO_read(rbio,
 469                                        (unsigned char *)salt,
 470                                        sizeof(salt)) != sizeof(salt)) {
 471                     BIO_printf(bio_err, "error reading input file\n");
 472                     goto end;
 473                 } else if (memcmp(mbuf, magic, sizeof(magic) - 1)) {
 474                     BIO_printf(bio_err, "bad magic number\n");
 475                     goto end;
 476                 }
 477                 sptr = salt;
 478             }
 479
 480             if (pbkdf2 == 1) {
 481                 /*
 482                 * derive key and default iv
 483                 * concatenated into a temporary buffer
 484                 */
 485                 unsigned char tmpkeyiv[EVP_MAX_KEY_LENGTH + EVP_MAX_IV_LENGTH];
 486                 int iklen = EVP_CIPHER_key_length(cipher);
 487                 int ivlen = EVP_CIPHER_iv_length(cipher);
 488                 /* not needed if HASH_UPDATE() is fixed : */
 489                 int islen = (sptr != NULL ? sizeof(salt) : 0);
 490                 if (!PKCS5_PBKDF2_HMAC(str, str_len, sptr, islen,
 491                                        iter, dgst, iklen+ivlen, tmpkeyiv)) {
 492                     BIO_printf(bio_err, "PKCS5_PBKDF2_HMAC failed\n");
 493                     goto end;
 494                 }
 495                 /* split and move data back to global buffer */
 496                 memcpy(key, tmpkeyiv, iklen);
 497                 memcpy(iv, tmpkeyiv+iklen, ivlen);
 498             } else {
 499                 BIO_printf(bio_err, "*** WARNING : "
 500                                     "deprecated key derivation used.\n"
 501                                     "Using -iter or -pbkdf2 would be better.\n");
 502                 if (!EVP_BytesToKey(cipher, dgst, sptr,
 503                                     (unsigned char *)str, str_len,
 504                                     1, key, iv)) {
 505                     BIO_printf(bio_err, "EVP_BytesToKey failed\n");
 506                     goto end;
 507                 }
 508             }
 509             /*
 510              * zero the complete buffer or the string passed from the command
 511              * line.
 512              */
 513             if (str == strbuf)
 514                 OPENSSL_cleanse(str, SIZE);
 515             else
 516                 OPENSSL_cleanse(str, str_len);
 517         }
 518         if (hiv != NULL) {
 519             int siz = EVP_CIPHER_iv_length(cipher);
 520             if (siz == 0) {
 521                 BIO_printf(bio_err, "warning: iv not used by this cipher\n");
 522             } else if (!set_hex(hiv, iv, siz)) {
 523                 BIO_printf(bio_err, "invalid hex iv value\n");
 524                 goto end;
 525             }
 526         }
 527         if ((hiv == NULL) && (str == NULL)
 528             && EVP_CIPHER_iv_length(cipher) != 0) {
 529             /*
 530              * No IV was explicitly set and no IV was generated.
 531              * Hence the IV is undefined, making correct decryption impossible.
 532              */
 533             BIO_printf(bio_err, "iv undefined\n");
 534             goto end;
 535         }
 536         if (hkey != NULL) {
 537             if (!set_hex(hkey, key, EVP_CIPHER_key_length(cipher))) {
 538                 BIO_printf(bio_err, "invalid hex key value\n");
 539                 goto end;
 540             }
 541             /* wiping secret data as we no longer need it */
 542             cleanse(hkey);
 543         }
 544
 545         if ((benc = BIO_new(BIO_f_cipher())) == NULL)
 546             goto end;
 547
 548         /*
 549          * Since we may be changing parameters work on the encryption context
 550          * rather than calling BIO_set_cipher().
 551          */
 552
 553         BIO_get_cipher_ctx(benc, &ctx);
 554
 555         if (!EVP_CipherInit_ex(ctx, cipher, e, NULL, NULL, enc)) {
 556             BIO_printf(bio_err, "Error setting cipher %s\n",
 557                        EVP_CIPHER_name(cipher));
 558             ERR_print_errors(bio_err);
 559             goto end;
 560         }
 561
 562         if (nopad)
 563             EVP_CIPHER_CTX_set_padding(ctx, 0);
 564
 565         if (!EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, enc)) {
 566             BIO_printf(bio_err, "Error setting cipher %s\n",
 567                        EVP_CIPHER_name(cipher));
 568             ERR_print_errors(bio_err);
 569             goto end;
 570         }
 571
 572         if (debug) {
 573             BIO_set_callback(benc, BIO_debug_callback);
 574             BIO_set_callback_arg(benc, (char *)bio_err);
 575         }
 576
 577         if (printkey) {
 578             if (!nosalt) {
 579                 printf("salt=");
 580                 for (i = 0; i < (int)sizeof(salt); i++)
 581                     printf("%02X", salt[i]);
 582                 printf("\n");
 583             }
 584             if (EVP_CIPHER_key_length(cipher) > 0) {
 585                 printf("key=");
 586                 for (i = 0; i < EVP_CIPHER_key_length(cipher); i++)
 587                     printf("%02X", key[i]);
 588                 printf("\n");
 589             }
 590             if (EVP_CIPHER_iv_length(cipher) > 0) {
 591                 printf("iv =");
 592                 for (i = 0; i < EVP_CIPHER_iv_length(cipher); i++)
 593                     printf("%02X", iv[i]);
 594                 printf("\n");
 595             }
 596             if (printkey == 2) {
 597                 ret = 0;
 598                 goto end;
 599             }
 600         }
 601     }
 602
 603     /* Only encrypt/decrypt as we write the file */
 604     if (benc != NULL)
 605         wbio = BIO_push(benc, wbio);
 606
 607     while (BIO_pending(rbio) || !BIO_eof(rbio)) {
 608         inl = BIO_read(rbio, (char *)buff, bsize);
 609         if (inl <= 0)
 610             break;
 611         if (BIO_write(wbio, (char *)buff, inl) != inl) {
 612             BIO_printf(bio_err, "error writing output file\n");
 613             goto end;
 614         }
 615     }
 616     if (!BIO_flush(wbio)) {
 617         BIO_printf(bio_err, "bad decrypt\n");
 618         goto end;
 619     }
 620
 621     ret = 0;
 622     if (verbose) {
 623         BIO_printf(bio_err, "bytes read   : %8ju\n", BIO_number_read(in));
 624         BIO_printf(bio_err, "bytes written: %8ju\n", BIO_number_written(out));
 625     }
 626  end:
 627     ERR_print_errors(bio_err);
 628     OPENSSL_free(strbuf);
 629     OPENSSL_free(buff);
 630     BIO_free(in);
 631     BIO_free_all(out);
 632     BIO_free(benc);
 633     BIO_free(b64);
 634 #ifdef ZLIB
 635     BIO_free(bzl);
 636 #endif
 637     release_engine(e);
 638     OPENSSL_free(pass);
 639     return ret;
 640 }
 641
 642 static void show_ciphers(const OBJ_NAME *name, void *arg)
 643 {
 644     struct doall_enc_ciphers *dec = (struct doall_enc_ciphers *)arg;
 645     const EVP_CIPHER *cipher;
 646
 647     if (!islower((unsigned char)*name->name))
 648         return;
 649
 650     /* Filter out ciphers that we cannot use */
 651     cipher = EVP_get_cipherbyname(name->name);
 652     if (cipher == NULL ||
 653             (EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) != 0 ||
 654             EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)
 655         return;
 656
 657     BIO_printf(dec->bio, "-%-25s", name->name);
 658     if (++dec->n == 3) {
 659         BIO_printf(dec->bio, "\n");
 660         dec->n = 0;
 661     } else
 662         BIO_printf(dec->bio, " ");
 663 }
 664
 665 static int set_hex(const char *in, unsigned char *out, int size)
 666 {
 667     int i, n;
 668     unsigned char j;
 669
 670     i = size * 2;
 671     n = strlen(in);
 672     if (n > i) {
 673         BIO_printf(bio_err, "hex string is too long, ignoring excess\n");
 674         n = i; /* ignore exceeding part */
 675     } else if (n < i) {
 676         BIO_printf(bio_err, "hex string is too short, padding with zero bytes to length\n");
 677     }
 678
 679     memset(out, 0, size);
 680     for (i = 0; i < n; i++) {
 681         j = (unsigned char)*in++;
 682         if (!isxdigit(j)) {
 683             BIO_printf(bio_err, "non-hex digit\n");
 684             return 0;
 685         }
 686         j = (unsigned char)OPENSSL_hexchar2int(j);
 687         if (i & 1)
 688             out[i / 2] |= j;
 689         else
 690             out[i / 2] = (j << 4);
 691     }
 692     return 1;
 693 }