apps/dgst.c

   1 /*
   2  * Copyright 1995-2022 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. To obtain the maximum security strength set this to 32 (or greater) for SHAKE128, and 64 (or greater) for SHAKE256"},
  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     if (md != NULL)
 118         digestname = argv[0];
 119
 120     opt_set_unknown_name("digest");
 121     prog = opt_init(argc, argv, dgst_options);
 122     while ((o = opt_next()) != OPT_EOF) {
 123         switch (o) {
 124         case OPT_EOF:
 125         case OPT_ERR:
 126  opthelp:
 127             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 128             goto end;
 129         case OPT_HELP:
 130             opt_help(dgst_options);
 131             ret = EXIT_SUCCESS;
 132             goto end;
 133         case OPT_LIST:
 134             BIO_printf(bio_out, "Supported digests:\n");
 135             dec.bio = bio_out;
 136             dec.n = 0;
 137             OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_MD_METH,
 138                                    show_digests, &dec);
 139             BIO_printf(bio_out, "\n");
 140             ret = EXIT_SUCCESS;
 141             goto end;
 142         case OPT_C:
 143             separator = 1;
 144             break;
 145         case OPT_R:
 146             separator = 2;
 147             break;
 148         case OPT_R_CASES:
 149             if (!opt_rand(o))
 150                 goto end;
 151             break;
 152         case OPT_OUT:
 153             outfile = opt_arg();
 154             break;
 155         case OPT_SIGN:
 156             keyfile = opt_arg();
 157             break;
 158         case OPT_PASSIN:
 159             passinarg = opt_arg();
 160             break;
 161         case OPT_VERIFY:
 162             keyfile = opt_arg();
 163             want_pub = do_verify = 1;
 164             break;
 165         case OPT_PRVERIFY:
 166             keyfile = opt_arg();
 167             do_verify = 1;
 168             break;
 169         case OPT_SIGNATURE:
 170             sigfile = opt_arg();
 171             break;
 172         case OPT_KEYFORM:
 173             if (!opt_format(opt_arg(), OPT_FMT_ANY, &keyform))
 174                 goto opthelp;
 175             break;
 176         case OPT_ENGINE:
 177             e = setup_engine(opt_arg(), 0);
 178             break;
 179         case OPT_ENGINE_IMPL:
 180             engine_impl = 1;
 181             break;
 182         case OPT_HEX:
 183             out_bin = 0;
 184             break;
 185         case OPT_BINARY:
 186             out_bin = 1;
 187             break;
 188         case OPT_XOFLEN:
 189             xoflen = atoi(opt_arg());
 190             break;
 191         case OPT_DEBUG:
 192             debug = 1;
 193             break;
 194         case OPT_FIPS_FINGERPRINT:
 195             hmac_key = "etaonrishdlcupfm";
 196             break;
 197         case OPT_HMAC:
 198             hmac_key = opt_arg();
 199             break;
 200         case OPT_MAC:
 201             mac_name = opt_arg();
 202             break;
 203         case OPT_SIGOPT:
 204             if (!sigopts)
 205                 sigopts = sk_OPENSSL_STRING_new_null();
 206             if (!sigopts || !sk_OPENSSL_STRING_push(sigopts, opt_arg()))
 207                 goto opthelp;
 208             break;
 209         case OPT_MACOPT:
 210             if (!macopts)
 211                 macopts = sk_OPENSSL_STRING_new_null();
 212             if (!macopts || !sk_OPENSSL_STRING_push(macopts, opt_arg()))
 213                 goto opthelp;
 214             break;
 215         case OPT_DIGEST:
 216             digestname = opt_unknown();
 217             break;
 218         case OPT_PROV_CASES:
 219             if (!opt_provider(o))
 220                 goto end;
 221             break;
 222         }
 223     }
 224
 225     /* Remaining args are files to digest. */
 226     argc = opt_num_rest();
 227     argv = opt_rest();
 228     if (keyfile != NULL && argc > 1) {
 229         BIO_printf(bio_err, "%s: Can only sign or verify one file.\n", prog);
 230         goto end;
 231     }
 232     if (!app_RAND_load())
 233         goto end;
 234
 235     if (digestname != NULL) {
 236         if (!opt_md(digestname, &md))
 237             goto opthelp;
 238     }
 239
 240     if (do_verify && sigfile == NULL) {
 241         BIO_printf(bio_err,
 242                    "No signature to verify: use the -signature option\n");
 243         goto end;
 244     }
 245     if (engine_impl)
 246         impl = e;
 247
 248     in = BIO_new(BIO_s_file());
 249     bmd = BIO_new(BIO_f_md());
 250     if (in == NULL || bmd == NULL)
 251         goto end;
 252
 253     if (debug) {
 254         BIO_set_callback_ex(in, BIO_debug_callback_ex);
 255         /* needed for windows 3.1 */
 256         BIO_set_callback_arg(in, (char *)bio_err);
 257     }
 258
 259     if (!app_passwd(passinarg, NULL, &passin, NULL)) {
 260         BIO_printf(bio_err, "Error getting password\n");
 261         goto end;
 262     }
 263
 264     if (out_bin == -1) {
 265         if (keyfile != NULL)
 266             out_bin = 1;
 267         else
 268             out_bin = 0;
 269     }
 270
 271     out = bio_open_default(outfile, 'w', out_bin ? FORMAT_BINARY : FORMAT_TEXT);
 272     if (out == NULL)
 273         goto end;
 274
 275     if ((!(mac_name == NULL) + !(keyfile == NULL) + !(hmac_key == NULL)) > 1) {
 276         BIO_printf(bio_err, "MAC and signing key cannot both be specified\n");
 277         goto end;
 278     }
 279
 280     if (keyfile != NULL) {
 281         int type;
 282
 283         if (want_pub)
 284             sigkey = load_pubkey(keyfile, keyform, 0, NULL, e, "public key");
 285         else
 286             sigkey = load_key(keyfile, keyform, 0, passin, e, "private key");
 287         if (sigkey == NULL) {
 288             /*
 289              * load_[pub]key() has already printed an appropriate message
 290              */
 291             goto end;
 292         }
 293         type = EVP_PKEY_get_id(sigkey);
 294         if (type == EVP_PKEY_ED25519 || type == EVP_PKEY_ED448) {
 295             /*
 296              * We implement PureEdDSA for these which doesn't have a separate
 297              * digest, and only supports one shot.
 298              */
 299             BIO_printf(bio_err, "Key type not supported for this operation\n");
 300             goto end;
 301         }
 302     }
 303
 304     if (mac_name != NULL) {
 305         EVP_PKEY_CTX *mac_ctx = NULL;
 306
 307         if (!init_gen_str(&mac_ctx, mac_name, impl, 0, NULL, NULL))
 308             goto end;
 309         if (macopts != NULL) {
 310             for (i = 0; i < sk_OPENSSL_STRING_num(macopts); i++) {
 311                 char *macopt = sk_OPENSSL_STRING_value(macopts, i);
 312
 313                 if (pkey_ctrl_string(mac_ctx, macopt) <= 0) {
 314                     EVP_PKEY_CTX_free(mac_ctx);
 315                     BIO_printf(bio_err, "MAC parameter error \"%s\"\n", macopt);
 316                     goto end;
 317                 }
 318             }
 319         }
 320
 321         sigkey = app_keygen(mac_ctx, mac_name, 0, 0 /* not verbose */);
 322         /* Verbose output would make external-tests gost-engine fail */
 323         EVP_PKEY_CTX_free(mac_ctx);
 324     }
 325
 326     if (hmac_key != NULL) {
 327         if (md == NULL) {
 328             md = (EVP_MD *)EVP_sha256();
 329             digestname = SN_sha256;
 330         }
 331         sigkey = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, impl,
 332                                               (unsigned char *)hmac_key,
 333                                               strlen(hmac_key));
 334         if (sigkey == NULL)
 335             goto end;
 336     }
 337
 338     if (sigkey != NULL) {
 339         EVP_MD_CTX *mctx = NULL;
 340         EVP_PKEY_CTX *pctx = NULL;
 341         int res;
 342
 343         if (BIO_get_md_ctx(bmd, &mctx) <= 0) {
 344             BIO_printf(bio_err, "Error getting context\n");
 345             goto end;
 346         }
 347         if (do_verify)
 348             if (impl == NULL)
 349                 res = EVP_DigestVerifyInit_ex(mctx, &pctx, digestname,
 350                                               app_get0_libctx(),
 351                                               app_get0_propq(), sigkey, NULL);
 352             else
 353                 res = EVP_DigestVerifyInit(mctx, &pctx, md, impl, sigkey);
 354         else
 355             if (impl == NULL)
 356                 res = EVP_DigestSignInit_ex(mctx, &pctx, digestname,
 357                                             app_get0_libctx(),
 358                                             app_get0_propq(), sigkey, NULL);
 359             else
 360                 res = EVP_DigestSignInit(mctx, &pctx, md, impl, sigkey);
 361         if (res == 0) {
 362             BIO_printf(bio_err, "Error setting context\n");
 363             goto end;
 364         }
 365         if (sigopts != NULL) {
 366             for (i = 0; i < sk_OPENSSL_STRING_num(sigopts); i++) {
 367                 char *sigopt = sk_OPENSSL_STRING_value(sigopts, i);
 368
 369                 if (pkey_ctrl_string(pctx, sigopt) <= 0) {
 370                     BIO_printf(bio_err, "Signature parameter error \"%s\"\n",
 371                                sigopt);
 372                     goto end;
 373                 }
 374             }
 375         }
 376     }
 377     /* we use md as a filter, reading from 'in' */
 378     else {
 379         EVP_MD_CTX *mctx = NULL;
 380         if (BIO_get_md_ctx(bmd, &mctx) <= 0) {
 381             BIO_printf(bio_err, "Error getting context\n");
 382             goto end;
 383         }
 384         if (md == NULL)
 385             md = (EVP_MD *)EVP_sha256();
 386         if (!EVP_DigestInit_ex(mctx, md, impl)) {
 387             BIO_printf(bio_err, "Error setting digest\n");
 388             goto end;
 389         }
 390     }
 391
 392     if (sigfile != NULL && sigkey != NULL) {
 393         BIO *sigbio = BIO_new_file(sigfile, "rb");
 394
 395         if (sigbio == NULL) {
 396             BIO_printf(bio_err, "Error opening signature file %s\n", sigfile);
 397             goto end;
 398         }
 399         siglen = EVP_PKEY_get_size(sigkey);
 400         sigbuf = app_malloc(siglen, "signature buffer");
 401         siglen = BIO_read(sigbio, sigbuf, siglen);
 402         BIO_free(sigbio);
 403         if (siglen <= 0) {
 404             BIO_printf(bio_err, "Error reading signature file %s\n", sigfile);
 405             goto end;
 406         }
 407     }
 408     inp = BIO_push(bmd, in);
 409
 410     if (md == NULL) {
 411         EVP_MD_CTX *tctx;
 412
 413         BIO_get_md_ctx(bmd, &tctx);
 414         md = EVP_MD_CTX_get1_md(tctx);
 415     }
 416     if (md != NULL)
 417         md_name = EVP_MD_get0_name(md);
 418
 419     if (xoflen > 0) {
 420         if (!(EVP_MD_get_flags(md) & EVP_MD_FLAG_XOF)) {
 421             BIO_printf(bio_err, "Length can only be specified for XOF\n");
 422             goto end;
 423         }
 424         /*
 425          * Signing using XOF is not supported by any algorithms currently since
 426          * each algorithm only calls EVP_DigestFinal_ex() in their sign_final
 427          * and verify_final methods.
 428          */
 429         if (sigkey != NULL) {
 430             BIO_printf(bio_err, "Signing key cannot be specified for XOF\n");
 431             goto end;
 432         }
 433     }
 434
 435     if (argc == 0) {
 436         BIO_set_fp(in, stdin, BIO_NOCLOSE);
 437         ret = do_fp(out, buf, inp, separator, out_bin, xoflen, sigkey, sigbuf,
 438                     siglen, NULL, md_name, "stdin");
 439     } else {
 440         const char *sig_name = NULL;
 441
 442         if (out_bin == 0) {
 443             if (sigkey != NULL)
 444                 sig_name = EVP_PKEY_get0_type_name(sigkey);
 445         }
 446         ret = EXIT_SUCCESS;
 447         for (i = 0; i < argc; i++) {
 448             if (BIO_read_filename(in, argv[i]) <= 0) {
 449                 perror(argv[i]);
 450                 ret = EXIT_FAILURE;
 451                 continue;
 452             } else {
 453                 if (do_fp(out, buf, inp, separator, out_bin, xoflen,
 454                           sigkey, sigbuf, siglen, sig_name, md_name, argv[i]))
 455                     ret = EXIT_FAILURE;
 456             }
 457             (void)BIO_reset(bmd);
 458         }
 459     }
 460  end:
 461     if (ret != EXIT_SUCCESS)
 462         ERR_print_errors(bio_err);
 463     OPENSSL_clear_free(buf, BUFSIZE);
 464     BIO_free(in);
 465     OPENSSL_free(passin);
 466     BIO_free_all(out);
 467     EVP_MD_free(md);
 468     EVP_PKEY_free(sigkey);
 469     sk_OPENSSL_STRING_free(sigopts);
 470     sk_OPENSSL_STRING_free(macopts);
 471     OPENSSL_free(sigbuf);
 472     BIO_free(bmd);
 473     release_engine(e);
 474     return ret;
 475 }
 476
 477 static void show_digests(const OBJ_NAME *name, void *arg)
 478 {
 479     struct doall_dgst_digests *dec = (struct doall_dgst_digests *)arg;
 480     const EVP_MD *md = NULL;
 481
 482     /* Filter out signed digests (a.k.a signature algorithms) */
 483     if (strstr(name->name, "rsa") != NULL || strstr(name->name, "RSA") != NULL)
 484         return;
 485
 486     if (!islower((unsigned char)*name->name))
 487         return;
 488
 489     /* Filter out message digests that we cannot use */
 490     md = EVP_MD_fetch(app_get0_libctx(), name->name, app_get0_propq());
 491     if (md == NULL) {
 492         md = EVP_get_digestbyname(name->name);
 493         if (md == NULL)
 494             return;
 495     }
 496
 497     BIO_printf(dec->bio, "-%-25s", name->name);
 498     if (++dec->n == 3) {
 499         BIO_printf(dec->bio, "\n");
 500         dec->n = 0;
 501     } else {
 502         BIO_printf(dec->bio, " ");
 503     }
 504 }
 505
 506 /*
 507  * The newline_escape_filename function performs newline escaping for any
 508  * filename that contains a newline.  This function also takes a pointer
 509  * to backslash. The backslash pointer is a flag to indicating whether a newline
 510  * is present in the filename.  If a newline is present, the backslash flag is
 511  * set and the output format will contain a backslash at the beginning of the
 512  * digest output. This output format is to replicate the output format found
 513  * in the '*sum' checksum programs. This aims to preserve backward
 514  * compatibility.
 515  */
 516 static const char *newline_escape_filename(const char *file, int * backslash)
 517 {
 518     size_t i, e = 0, length = strlen(file), newline_count = 0, mem_len = 0;
 519     char *file_cpy = NULL;
 520
 521     for (i = 0; i < length; i++)
 522         if (file[i] == '\n')
 523             newline_count++;
 524
 525     mem_len = length + newline_count + 1;
 526     file_cpy = app_malloc(mem_len, file);
 527     i = 0;
 528
 529     while (e < length) {
 530         const char c = file[e];
 531         if (c == '\n') {
 532             file_cpy[i++] = '\\';
 533             file_cpy[i++] = 'n';
 534             *backslash = 1;
 535         } else {
 536             file_cpy[i++] = c;
 537         }
 538         e++;
 539     }
 540     file_cpy[i] = '\0';
 541     return (const char*)file_cpy;
 542 }
 543
 544
 545 int do_fp(BIO *out, unsigned char *buf, BIO *bp, int sep, int binout, int xoflen,
 546           EVP_PKEY *key, unsigned char *sigin, int siglen,
 547           const char *sig_name, const char *md_name,
 548           const char *file)
 549 {
 550     size_t len = BUFSIZE;
 551     int i, backslash = 0, ret = EXIT_FAILURE;
 552     unsigned char *allocated_buf = NULL;
 553
 554     while (BIO_pending(bp) || !BIO_eof(bp)) {
 555         i = BIO_read(bp, (char *)buf, BUFSIZE);
 556         if (i < 0) {
 557             BIO_printf(bio_err, "Read error in %s\n", file);
 558             goto end;
 559         }
 560         if (i == 0)
 561             break;
 562     }
 563     if (sigin != NULL) {
 564         EVP_MD_CTX *ctx;
 565         BIO_get_md_ctx(bp, &ctx);
 566         i = EVP_DigestVerifyFinal(ctx, sigin, (unsigned int)siglen);
 567         if (i > 0) {
 568             BIO_printf(out, "Verified OK\n");
 569         } else if (i == 0) {
 570             BIO_printf(out, "Verification failure\n");
 571             goto end;
 572         } else {
 573             BIO_printf(bio_err, "Error verifying data\n");
 574             goto end;
 575         }
 576         ret = EXIT_SUCCESS;
 577         goto end;
 578     }
 579     if (key != NULL) {
 580         EVP_MD_CTX *ctx;
 581         size_t tmplen;
 582
 583         BIO_get_md_ctx(bp, &ctx);
 584         if (!EVP_DigestSignFinal(ctx, NULL, &tmplen)) {
 585             BIO_printf(bio_err, "Error getting maximum length of signed data\n");
 586             goto end;
 587         }
 588         if (tmplen > BUFSIZE) {
 589             len = tmplen;
 590             allocated_buf = app_malloc(len, "Signature buffer");
 591             buf = allocated_buf;
 592         }
 593         if (!EVP_DigestSignFinal(ctx, buf, &len)) {
 594             BIO_printf(bio_err, "Error signing data\n");
 595             goto end;
 596         }
 597     } else if (xoflen > 0) {
 598         EVP_MD_CTX *ctx;
 599
 600         len = xoflen;
 601         if (len > BUFSIZE) {
 602             allocated_buf = app_malloc(len, "Digest buffer");
 603             buf = allocated_buf;
 604         }
 605
 606         BIO_get_md_ctx(bp, &ctx);
 607
 608         if (!EVP_DigestFinalXOF(ctx, buf, len)) {
 609             BIO_printf(bio_err, "Error Digesting Data\n");
 610             goto end;
 611         }
 612     } else {
 613         len = BIO_gets(bp, (char *)buf, BUFSIZE);
 614         if ((int)len < 0)
 615             goto end;
 616     }
 617
 618     if (binout) {
 619         BIO_write(out, buf, len);
 620     } else if (sep == 2) {
 621         file = newline_escape_filename(file, &backslash);
 622
 623         if (backslash == 1)
 624             BIO_puts(out, "\\");
 625
 626         for (i = 0; i < (int)len; i++)
 627             BIO_printf(out, "%02x", buf[i]);
 628
 629         BIO_printf(out, " *%s\n", file);
 630         OPENSSL_free((char *)file);
 631     } else {
 632         if (sig_name != NULL) {
 633             BIO_puts(out, sig_name);
 634             if (md_name != NULL)
 635                 BIO_printf(out, "-%s", md_name);
 636             BIO_printf(out, "(%s)= ", file);
 637         } else if (md_name != NULL) {
 638             BIO_printf(out, "%s(%s)= ", md_name, file);
 639         } else {
 640             BIO_printf(out, "(%s)= ", file);
 641         }
 642         for (i = 0; i < (int)len; i++) {
 643             if (sep && (i != 0))
 644                 BIO_printf(out, ":");
 645             BIO_printf(out, "%02x", buf[i]);
 646         }
 647         BIO_printf(out, "\n");
 648     }
 649
 650     ret = EXIT_SUCCESS;
 651  end:
 652     if (allocated_buf != NULL)
 653         OPENSSL_clear_free(allocated_buf, len);
 654
 655     return ret;
 656 }