apps/dgst.c

   1 /*
   2  * Copyright 1995-2021 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 <string.h>
  12 #include <stdlib.h>
  13 #include "apps.h"
  14 #include "progs.h"
  15 #include <openssl/bio.h>
  16 #include <openssl/err.h>
  17 #include <openssl/evp.h>
  18 #include <openssl/objects.h>
  19 #include <openssl/x509.h>
  20 #include <openssl/pem.h>
  21 #include <openssl/hmac.h>
  22 #include <ctype.h>
  23
  24 #undef BUFSIZE
  25 #define BUFSIZE 1024*8
  26
  27 int do_fp(BIO *out, unsigned char *buf, BIO *bp, int sep, int binout, int xoflen,
  28           EVP_PKEY *key, unsigned char *sigin, int siglen,
  29           const char *sig_name, const char *md_name,
  30           const char *file);
  31 static void show_digests(const OBJ_NAME *name, void *bio_);
  32
  33 struct doall_dgst_digests {
  34     BIO *bio;
  35     int n;
  36 };
  37
  38 typedef enum OPTION_choice {
  39     OPT_COMMON,
  40     OPT_LIST,
  41     OPT_C, OPT_R, OPT_OUT, OPT_SIGN, OPT_PASSIN, OPT_VERIFY,
  42     OPT_PRVERIFY, OPT_SIGNATURE, OPT_KEYFORM, OPT_ENGINE, OPT_ENGINE_IMPL,
  43     OPT_HEX, OPT_BINARY, OPT_DEBUG, OPT_FIPS_FINGERPRINT,
  44     OPT_HMAC, OPT_MAC, OPT_SIGOPT, OPT_MACOPT, OPT_XOFLEN,
  45     OPT_DIGEST,
  46     OPT_R_ENUM, OPT_PROV_ENUM
  47 } OPTION_CHOICE;
  48
  49 const OPTIONS dgst_options[] = {
  50     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [file...]\n"},
  51
  52     OPT_SECTION("General"),
  53     {"help", OPT_HELP, '-', "Display this summary"},
  54     {"list", OPT_LIST, '-', "List digests"},
  55 #ifndef OPENSSL_NO_ENGINE
  56     {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
  57     {"engine_impl", OPT_ENGINE_IMPL, '-',
  58      "Also use engine given by -engine for digest operations"},
  59 #endif
  60     {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
  61
  62     OPT_SECTION("Output"),
  63     {"c", OPT_C, '-', "Print the digest with separating colons"},
  64     {"r", OPT_R, '-', "Print the digest in coreutils format"},
  65     {"out", OPT_OUT, '>', "Output to filename rather than stdout"},
  66     {"keyform", OPT_KEYFORM, 'f', "Key file format (ENGINE, other values ignored)"},
  67     {"hex", OPT_HEX, '-', "Print as hex dump"},
  68     {"binary", OPT_BINARY, '-', "Print in binary form"},
  69     {"xoflen", OPT_XOFLEN, 'p', "Output length for XOF algorithms"},
  70     {"d", OPT_DEBUG, '-', "Print debug info"},
  71     {"debug", OPT_DEBUG, '-', "Print debug info"},
  72
  73     OPT_SECTION("Signing"),
  74     {"sign", OPT_SIGN, 's', "Sign digest using private key"},
  75     {"verify", OPT_VERIFY, 's', "Verify a signature using public key"},
  76     {"prverify", OPT_PRVERIFY, 's', "Verify a signature using private key"},
  77     {"sigopt", OPT_SIGOPT, 's', "Signature parameter in n:v form"},
  78     {"signature", OPT_SIGNATURE, '<', "File with signature to verify"},
  79     {"hmac", OPT_HMAC, 's', "Create hashed MAC with key"},
  80     {"mac", OPT_MAC, 's', "Create MAC (not necessarily HMAC)"},
  81     {"macopt", OPT_MACOPT, 's', "MAC algorithm parameters in n:v form or key"},
  82     {"", OPT_DIGEST, '-', "Any supported digest"},
  83     {"fips-fingerprint", OPT_FIPS_FINGERPRINT, '-',
  84      "Compute HMAC with the key used in OpenSSL-FIPS fingerprint"},
  85
  86     OPT_R_OPTIONS,
  87     OPT_PROV_OPTIONS,
  88
  89     OPT_PARAMETERS(),
  90     {"file", 0, 0, "Files to digest (optional; default is stdin)"},
  91     {NULL}
  92 };
  93
  94 int dgst_main(int argc, char **argv)
  95 {
  96     BIO *in = NULL, *inp, *bmd = NULL, *out = NULL;
  97     ENGINE *e = NULL, *impl = NULL;
  98     EVP_PKEY *sigkey = NULL;
  99     STACK_OF(OPENSSL_STRING) *sigopts = NULL, *macopts = NULL;
 100     char *hmac_key = NULL;
 101     char *mac_name = NULL, *digestname = NULL;
 102     char *passinarg = NULL, *passin = NULL;
 103     EVP_MD *md = NULL;
 104     const char *outfile = NULL, *keyfile = NULL, *prog = NULL;
 105     const char *sigfile = NULL;
 106     const char *md_name = NULL;
 107     OPTION_CHOICE o;
 108     int separator = 0, debug = 0, keyform = FORMAT_UNDEF, siglen = 0;
 109     int i, ret = EXIT_FAILURE, out_bin = -1, want_pub = 0, do_verify = 0;
 110     int xoflen = 0;
 111     unsigned char *buf = NULL, *sigbuf = NULL;
 112     int engine_impl = 0;
 113     struct doall_dgst_digests dec;
 114
 115     buf = app_malloc(BUFSIZE, "I/O buffer");
 116     md = (EVP_MD *)EVP_get_digestbyname(argv[0]);
 117
 118     opt_set_unknown_name("digest");
 119     prog = opt_init(argc, argv, dgst_options);
 120     while ((o = opt_next()) != OPT_EOF) {
 121         switch (o) {
 122         case OPT_EOF:
 123         case OPT_ERR:
 124  opthelp:
 125             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 126             goto end;
 127         case OPT_HELP:
 128             opt_help(dgst_options);
 129             ret = EXIT_SUCCESS;
 130             goto end;
 131         case OPT_LIST:
 132             BIO_printf(bio_out, "Supported digests:\n");
 133             dec.bio = bio_out;
 134             dec.n = 0;
 135             OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_MD_METH,
 136                                    show_digests, &dec);
 137             BIO_printf(bio_out, "\n");
 138             ret = EXIT_SUCCESS;
 139             goto end;
 140         case OPT_C:
 141             separator = 1;
 142             break;
 143         case OPT_R:
 144             separator = 2;
 145             break;
 146         case OPT_R_CASES:
 147             if (!opt_rand(o))
 148                 goto end;
 149             break;
 150         case OPT_OUT:
 151             outfile = opt_arg();
 152             break;
 153         case OPT_SIGN:
 154             keyfile = opt_arg();
 155             break;
 156         case OPT_PASSIN:
 157             passinarg = opt_arg();
 158             break;
 159         case OPT_VERIFY:
 160             keyfile = opt_arg();
 161             want_pub = do_verify = 1;
 162             break;
 163         case OPT_PRVERIFY:
 164             keyfile = opt_arg();
 165             do_verify = 1;
 166             break;
 167         case OPT_SIGNATURE:
 168             sigfile = opt_arg();
 169             break;
 170         case OPT_KEYFORM:
 171             if (!opt_format(opt_arg(), OPT_FMT_ANY, &keyform))
 172                 goto opthelp;
 173             break;
 174         case OPT_ENGINE:
 175             e = setup_engine(opt_arg(), 0);
 176             break;
 177         case OPT_ENGINE_IMPL:
 178             engine_impl = 1;
 179             break;
 180         case OPT_HEX:
 181             out_bin = 0;
 182             break;
 183         case OPT_BINARY:
 184             out_bin = 1;
 185             break;
 186         case OPT_XOFLEN:
 187             xoflen = atoi(opt_arg());
 188             break;
 189         case OPT_DEBUG:
 190             debug = 1;
 191             break;
 192         case OPT_FIPS_FINGERPRINT:
 193             hmac_key = "etaonrishdlcupfm";
 194             break;
 195         case OPT_HMAC:
 196             hmac_key = opt_arg();
 197             break;
 198         case OPT_MAC:
 199             mac_name = opt_arg();
 200             break;
 201         case OPT_SIGOPT:
 202             if (!sigopts)
 203                 sigopts = sk_OPENSSL_STRING_new_null();
 204             if (!sigopts || !sk_OPENSSL_STRING_push(sigopts, opt_arg()))
 205                 goto opthelp;
 206             break;
 207         case OPT_MACOPT:
 208             if (!macopts)
 209                 macopts = sk_OPENSSL_STRING_new_null();
 210             if (!macopts || !sk_OPENSSL_STRING_push(macopts, opt_arg()))
 211                 goto opthelp;
 212             break;
 213         case OPT_DIGEST:
 214             digestname = opt_unknown();
 215             break;
 216         case OPT_PROV_CASES:
 217             if (!opt_provider(o))
 218                 goto end;
 219             break;
 220         }
 221     }
 222
 223     /* Remaining args are files to digest. */
 224     argc = opt_num_rest();
 225     argv = opt_rest();
 226     if (keyfile != NULL && argc > 1) {
 227         BIO_printf(bio_err, "%s: Can only sign or verify one file.\n", prog);
 228         goto end;
 229     }
 230     if (!app_RAND_load())
 231         goto end;
 232
 233     if (digestname != NULL) {
 234         if (!opt_md(digestname, &md))
 235             goto opthelp;
 236     }
 237
 238     if (do_verify && sigfile == NULL) {
 239         BIO_printf(bio_err,
 240                    "No signature to verify: use the -signature option\n");
 241         goto end;
 242     }
 243     if (engine_impl)
 244         impl = e;
 245
 246     in = BIO_new(BIO_s_file());
 247     bmd = BIO_new(BIO_f_md());
 248     if (in == NULL || bmd == NULL)
 249         goto end;
 250
 251     if (debug) {
 252         BIO_set_callback_ex(in, BIO_debug_callback_ex);
 253         /* needed for windows 3.1 */
 254         BIO_set_callback_arg(in, (char *)bio_err);
 255     }
 256
 257     if (!app_passwd(passinarg, NULL, &passin, NULL)) {
 258         BIO_printf(bio_err, "Error getting password\n");
 259         goto end;
 260     }
 261
 262     if (out_bin == -1) {
 263         if (keyfile != NULL)
 264             out_bin = 1;
 265         else
 266             out_bin = 0;
 267     }
 268
 269     out = bio_open_default(outfile, 'w', out_bin ? FORMAT_BINARY : FORMAT_TEXT);
 270     if (out == NULL)
 271         goto end;
 272
 273     if ((!(mac_name == NULL) + !(keyfile == NULL) + !(hmac_key == NULL)) > 1) {
 274         BIO_printf(bio_err, "MAC and signing key cannot both be specified\n");
 275         goto end;
 276     }
 277
 278     if (keyfile != NULL) {
 279         int type;
 280
 281         if (want_pub)
 282             sigkey = load_pubkey(keyfile, keyform, 0, NULL, e, "public key");
 283         else
 284             sigkey = load_key(keyfile, keyform, 0, passin, e, "private key");
 285         if (sigkey == NULL) {
 286             /*
 287              * load_[pub]key() has already printed an appropriate message
 288              */
 289             goto end;
 290         }
 291         type = EVP_PKEY_get_id(sigkey);
 292         if (type == EVP_PKEY_ED25519 || type == EVP_PKEY_ED448) {
 293             /*
 294              * We implement PureEdDSA for these which doesn't have a separate
 295              * digest, and only supports one shot.
 296              */
 297             BIO_printf(bio_err, "Key type not supported for this operation\n");
 298             goto end;
 299         }
 300     }
 301
 302     if (mac_name != NULL) {
 303         EVP_PKEY_CTX *mac_ctx = NULL;
 304
 305         if (!init_gen_str(&mac_ctx, mac_name, impl, 0, NULL, NULL))
 306             goto end;
 307         if (macopts != NULL) {
 308             for (i = 0; i < sk_OPENSSL_STRING_num(macopts); i++) {
 309                 char *macopt = sk_OPENSSL_STRING_value(macopts, i);
 310
 311                 if (pkey_ctrl_string(mac_ctx, macopt) <= 0) {
 312                     EVP_PKEY_CTX_free(mac_ctx);
 313                     BIO_printf(bio_err, "MAC parameter error \"%s\"\n", macopt);
 314                     goto end;
 315                 }
 316             }
 317         }
 318
 319         sigkey = app_keygen(mac_ctx, mac_name, 0, 0 /* not verbose */);
 320         /* Verbose output would make external-tests gost-engine fail */
 321         EVP_PKEY_CTX_free(mac_ctx);
 322     }
 323
 324     if (hmac_key != NULL) {
 325         if (md == NULL)
 326             md = (EVP_MD *)EVP_sha256();
 327         sigkey = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, impl,
 328                                               (unsigned char *)hmac_key,
 329                                               strlen(hmac_key));
 330         if (sigkey == NULL)
 331             goto end;
 332     }
 333
 334     if (sigkey != NULL) {
 335         EVP_MD_CTX *mctx = NULL;
 336         EVP_PKEY_CTX *pctx = NULL;
 337         int res;
 338
 339         if (BIO_get_md_ctx(bmd, &mctx) <= 0) {
 340             BIO_printf(bio_err, "Error getting context\n");
 341             goto end;
 342         }
 343         if (do_verify)
 344             res = EVP_DigestVerifyInit(mctx, &pctx, md, impl, sigkey);
 345         else
 346             res = EVP_DigestSignInit(mctx, &pctx, md, impl, sigkey);
 347         if (res == 0) {
 348             BIO_printf(bio_err, "Error setting context\n");
 349             goto end;
 350         }
 351         if (sigopts != NULL) {
 352             for (i = 0; i < sk_OPENSSL_STRING_num(sigopts); i++) {
 353                 char *sigopt = sk_OPENSSL_STRING_value(sigopts, i);
 354
 355                 if (pkey_ctrl_string(pctx, sigopt) <= 0) {
 356                     BIO_printf(bio_err, "Signature parameter error \"%s\"\n",
 357                                sigopt);
 358                     goto end;
 359                 }
 360             }
 361         }
 362     }
 363     /* we use md as a filter, reading from 'in' */
 364     else {
 365         EVP_MD_CTX *mctx = NULL;
 366         if (BIO_get_md_ctx(bmd, &mctx) <= 0) {
 367             BIO_printf(bio_err, "Error getting context\n");
 368             goto end;
 369         }
 370         if (md == NULL)
 371             md = (EVP_MD *)EVP_sha256();
 372         if (!EVP_DigestInit_ex(mctx, md, impl)) {
 373             BIO_printf(bio_err, "Error setting digest\n");
 374             goto end;
 375         }
 376     }
 377
 378     if (sigfile != NULL && sigkey != NULL) {
 379         BIO *sigbio = BIO_new_file(sigfile, "rb");
 380
 381         if (sigbio == NULL) {
 382             BIO_printf(bio_err, "Error opening signature file %s\n", sigfile);
 383             goto end;
 384         }
 385         siglen = EVP_PKEY_get_size(sigkey);
 386         sigbuf = app_malloc(siglen, "signature buffer");
 387         siglen = BIO_read(sigbio, sigbuf, siglen);
 388         BIO_free(sigbio);
 389         if (siglen <= 0) {
 390             BIO_printf(bio_err, "Error reading signature file %s\n", sigfile);
 391             goto end;
 392         }
 393     }
 394     inp = BIO_push(bmd, in);
 395
 396     if (md == NULL) {
 397         EVP_MD_CTX *tctx;
 398
 399         BIO_get_md_ctx(bmd, &tctx);
 400         md = EVP_MD_CTX_get1_md(tctx);
 401     }
 402     if (md != NULL)
 403         md_name = EVP_MD_get0_name(md);
 404
 405     if (xoflen > 0) {
 406         if (!(EVP_MD_get_flags(md) & EVP_MD_FLAG_XOF)) {
 407             BIO_printf(bio_err, "Length can only be specified for XOF\n");
 408             goto end;
 409         }
 410         if (sigkey != NULL) {
 411             BIO_printf(bio_err, "Signing key cannot be specified for XOF\n");
 412             goto end;
 413         }
 414     }
 415
 416     if (argc == 0) {
 417         BIO_set_fp(in, stdin, BIO_NOCLOSE);
 418         ret = do_fp(out, buf, inp, separator, out_bin, xoflen, sigkey, sigbuf,
 419                     siglen, NULL, md_name, "stdin");
 420     } else {
 421         const char *sig_name = NULL;
 422
 423         if (out_bin == 0) {
 424             if (sigkey != NULL)
 425                 sig_name = EVP_PKEY_get0_type_name(sigkey);
 426         }
 427         ret = EXIT_SUCCESS;
 428         for (i = 0; i < argc; i++) {
 429             if (BIO_read_filename(in, argv[i]) <= 0) {
 430                 perror(argv[i]);
 431                 ret = EXIT_FAILURE;
 432                 continue;
 433             } else {
 434                 if (do_fp(out, buf, inp, separator, out_bin, xoflen,
 435                           sigkey, sigbuf, siglen, sig_name, md_name, argv[i]))
 436                     ret = EXIT_FAILURE;
 437             }
 438             (void)BIO_reset(bmd);
 439         }
 440     }
 441  end:
 442     if (ret != EXIT_SUCCESS)
 443         ERR_print_errors(bio_err);
 444     OPENSSL_clear_free(buf, BUFSIZE);
 445     BIO_free(in);
 446     OPENSSL_free(passin);
 447     BIO_free_all(out);
 448     EVP_MD_free(md);
 449     EVP_PKEY_free(sigkey);
 450     sk_OPENSSL_STRING_free(sigopts);
 451     sk_OPENSSL_STRING_free(macopts);
 452     OPENSSL_free(sigbuf);
 453     BIO_free(bmd);
 454     release_engine(e);
 455     return ret;
 456 }
 457
 458 static void show_digests(const OBJ_NAME *name, void *arg)
 459 {
 460     struct doall_dgst_digests *dec = (struct doall_dgst_digests *)arg;
 461     const EVP_MD *md = NULL;
 462
 463     /* Filter out signed digests (a.k.a signature algorithms) */
 464     if (strstr(name->name, "rsa") != NULL || strstr(name->name, "RSA") != NULL)
 465         return;
 466
 467     if (!islower((unsigned char)*name->name))
 468         return;
 469
 470     /* Filter out message digests that we cannot use */
 471     md = EVP_get_digestbyname(name->name);
 472     if (md == NULL)
 473         return;
 474
 475     BIO_printf(dec->bio, "-%-25s", name->name);
 476     if (++dec->n == 3) {
 477         BIO_printf(dec->bio, "\n");
 478         dec->n = 0;
 479     } else {
 480         BIO_printf(dec->bio, " ");
 481     }
 482 }
 483
 484 /*
 485  * The newline_escape_filename function performs newline escaping for any
 486  * filename that contains a newline.  This function also takes a pointer
 487  * to backslash. The backslash pointer is a flag to indicating whether a newline
 488  * is present in the filename.  If a newline is present, the backslash flag is
 489  * set and the output format will contain a backslash at the beginning of the
 490  * digest output. This output format is to replicate the output format found
 491  * in the '*sum' checksum programs. This aims to preserve backward
 492  * compatibility.
 493  */
 494 static const char *newline_escape_filename(const char *file, int * backslash)
 495 {
 496     size_t i, e = 0, length = strlen(file), newline_count = 0, mem_len = 0;
 497     char *file_cpy = NULL;
 498
 499     for (i = 0; i < length; i++)
 500         if (file[i] == '\n')
 501             newline_count++;
 502
 503     mem_len = length + newline_count + 1;
 504     file_cpy = app_malloc(mem_len, file);
 505     i = 0;
 506
 507     while (e < length) {
 508         const char c = file[e];
 509         if (c == '\n') {
 510             file_cpy[i++] = '\\';
 511             file_cpy[i++] = 'n';
 512             *backslash = 1;
 513         } else {
 514             file_cpy[i++] = c;
 515         }
 516         e++;
 517     }
 518     file_cpy[i] = '\0';
 519     return (const char*)file_cpy;
 520 }
 521
 522
 523 int do_fp(BIO *out, unsigned char *buf, BIO *bp, int sep, int binout, int xoflen,
 524           EVP_PKEY *key, unsigned char *sigin, int siglen,
 525           const char *sig_name, const char *md_name,
 526           const char *file)
 527 {
 528     size_t len = BUFSIZE;
 529     int i, backslash = 0, ret = EXIT_FAILURE;
 530     unsigned char *allocated_buf = NULL;
 531
 532     while (BIO_pending(bp) || !BIO_eof(bp)) {
 533         i = BIO_read(bp, (char *)buf, BUFSIZE);
 534         if (i < 0) {
 535             BIO_printf(bio_err, "Read error in %s\n", file);
 536             goto end;
 537         }
 538         if (i == 0)
 539             break;
 540     }
 541     if (sigin != NULL) {
 542         EVP_MD_CTX *ctx;
 543         BIO_get_md_ctx(bp, &ctx);
 544         i = EVP_DigestVerifyFinal(ctx, sigin, (unsigned int)siglen);
 545         if (i > 0) {
 546             BIO_printf(out, "Verified OK\n");
 547         } else if (i == 0) {
 548             BIO_printf(out, "Verification failure\n");
 549             goto end;
 550         } else {
 551             BIO_printf(bio_err, "Error verifying data\n");
 552             goto end;
 553         }
 554         ret = EXIT_SUCCESS;
 555         goto end;
 556     }
 557     if (key != NULL) {
 558         EVP_MD_CTX *ctx;
 559         size_t tmplen;
 560
 561         BIO_get_md_ctx(bp, &ctx);
 562         if (!EVP_DigestSignFinal(ctx, NULL, &tmplen)) {
 563             BIO_printf(bio_err, "Error getting maximum length of signed data\n");
 564             goto end;
 565         }
 566         if (tmplen > BUFSIZE) {
 567             len = tmplen;
 568             allocated_buf = app_malloc(len, "Signature buffer");
 569             buf = allocated_buf;
 570         }
 571         if (!EVP_DigestSignFinal(ctx, buf, &len)) {
 572             BIO_printf(bio_err, "Error signing data\n");
 573             goto end;
 574         }
 575     } else if (xoflen > 0) {
 576         EVP_MD_CTX *ctx;
 577
 578         len = xoflen;
 579         if (len > BUFSIZE) {
 580             allocated_buf = app_malloc(len, "Digest buffer");
 581             buf = allocated_buf;
 582         }
 583
 584         BIO_get_md_ctx(bp, &ctx);
 585
 586         if (!EVP_DigestFinalXOF(ctx, buf, len)) {
 587             BIO_printf(bio_err, "Error Digesting Data\n");
 588             goto end;
 589         }
 590     } else {
 591         len = BIO_gets(bp, (char *)buf, BUFSIZE);
 592         if ((int)len < 0)
 593             goto end;
 594     }
 595
 596     if (binout) {
 597         BIO_write(out, buf, len);
 598     } else if (sep == 2) {
 599         file = newline_escape_filename(file, &backslash);
 600
 601         if (backslash == 1)
 602             BIO_puts(out, "\\");
 603
 604         for (i = 0; i < (int)len; i++)
 605             BIO_printf(out, "%02x", buf[i]);
 606
 607         BIO_printf(out, " *%s\n", file);
 608         OPENSSL_free((char *)file);
 609     } else {
 610         if (sig_name != NULL) {
 611             BIO_puts(out, sig_name);
 612             if (md_name != NULL)
 613                 BIO_printf(out, "-%s", md_name);
 614             BIO_printf(out, "(%s)= ", file);
 615         } else if (md_name != NULL) {
 616             BIO_printf(out, "%s(%s)= ", md_name, file);
 617         } else {
 618             BIO_printf(out, "(%s)= ", file);
 619         }
 620         for (i = 0; i < (int)len; i++) {
 621             if (sep && (i != 0))
 622                 BIO_printf(out, ":");
 623             BIO_printf(out, "%02x", buf[i]);
 624         }
 625         BIO_printf(out, "\n");
 626     }
 627
 628     ret = EXIT_SUCCESS;
 629  end:
 630     if (allocated_buf != NULL)
 631         OPENSSL_clear_free(allocated_buf, len);
 632
 633     return ret;
 634 }