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_ERR = -1, OPT_EOF = 0, OPT_HELP, OPT_LIST,
  40     OPT_C, OPT_R, OPT_OUT, OPT_SIGN, OPT_PASSIN, OPT_VERIFY,
  41     OPT_PRVERIFY, OPT_SIGNATURE, OPT_KEYFORM, OPT_ENGINE, OPT_ENGINE_IMPL,
  42     OPT_HEX, OPT_BINARY, OPT_DEBUG, OPT_FIPS_FINGERPRINT,
  43     OPT_HMAC, OPT_MAC, OPT_SIGOPT, OPT_MACOPT, OPT_XOFLEN,
  44     OPT_DIGEST,
  45     OPT_R_ENUM, OPT_PROV_ENUM
  46 } OPTION_CHOICE;
  47
  48 const OPTIONS dgst_options[] = {
  49     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [file...]\n"},
  50
  51     OPT_SECTION("General"),
  52     {"help", OPT_HELP, '-', "Display this summary"},
  53     {"list", OPT_LIST, '-', "List digests"},
  54 #ifndef OPENSSL_NO_ENGINE
  55     {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
  56     {"engine_impl", OPT_ENGINE_IMPL, '-',
  57      "Also use engine given by -engine for digest operations"},
  58 #endif
  59     {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
  60
  61     OPT_SECTION("Output"),
  62     {"c", OPT_C, '-', "Print the digest with separating colons"},
  63     {"r", OPT_R, '-', "Print the digest in coreutils format"},
  64     {"out", OPT_OUT, '>', "Output to filename rather than stdout"},
  65     {"keyform", OPT_KEYFORM, 'f', "Key file format (ENGINE, other values ignored)"},
  66     {"hex", OPT_HEX, '-', "Print as hex dump"},
  67     {"binary", OPT_BINARY, '-', "Print in binary form"},
  68     {"xoflen", OPT_XOFLEN, 'p', "Output length for XOF algorithms"},
  69     {"d", OPT_DEBUG, '-', "Print debug info"},
  70     {"debug", OPT_DEBUG, '-', "Print debug info"},
  71
  72     OPT_SECTION("Signing"),
  73     {"sign", OPT_SIGN, 's', "Sign digest using private key"},
  74     {"verify", OPT_VERIFY, 's', "Verify a signature using public key"},
  75     {"prverify", OPT_PRVERIFY, 's', "Verify a signature using private key"},
  76     {"sigopt", OPT_SIGOPT, 's', "Signature parameter in n:v form"},
  77     {"signature", OPT_SIGNATURE, '<', "File with signature to verify"},
  78     {"hmac", OPT_HMAC, 's', "Create hashed MAC with key"},
  79     {"mac", OPT_MAC, 's', "Create MAC (not necessarily HMAC)"},
  80     {"macopt", OPT_MACOPT, 's', "MAC algorithm parameters in n:v form or key"},
  81     {"", OPT_DIGEST, '-', "Any supported digest"},
  82     {"fips-fingerprint", OPT_FIPS_FINGERPRINT, '-',
  83      "Compute HMAC with the key used in OpenSSL-FIPS fingerprint"},
  84
  85     OPT_R_OPTIONS,
  86     OPT_PROV_OPTIONS,
  87
  88     OPT_PARAMETERS(),
  89     {"file", 0, 0, "Files to digest (optional; default is stdin)"},
  90     {NULL}
  91 };
  92
  93 int dgst_main(int argc, char **argv)
  94 {
  95     BIO *in = NULL, *inp, *bmd = NULL, *out = NULL;
  96     ENGINE *e = NULL, *impl = NULL;
  97     EVP_PKEY *sigkey = NULL;
  98     STACK_OF(OPENSSL_STRING) *sigopts = NULL, *macopts = NULL;
  99     char *hmac_key = NULL;
 100     char *mac_name = NULL, *digestname = NULL;
 101     char *passinarg = NULL, *passin = NULL;
 102     const EVP_MD *md = NULL;
 103     const char *outfile = NULL, *keyfile = NULL, *prog = NULL;
 104     const char *sigfile = NULL;
 105     const char *md_name = NULL;
 106     OPTION_CHOICE o;
 107     int separator = 0, debug = 0, keyform = FORMAT_PEM, siglen = 0;
 108     int i, ret = 1, out_bin = -1, want_pub = 0, do_verify = 0;
 109     int xoflen = 0;
 110     unsigned char *buf = NULL, *sigbuf = NULL;
 111     int engine_impl = 0;
 112     struct doall_dgst_digests dec;
 113
 114     buf = app_malloc(BUFSIZE, "I/O buffer");
 115     md = EVP_get_digestbyname(argv[0]);
 116
 117     prog = opt_init(argc, argv, dgst_options);
 118     while ((o = opt_next()) != OPT_EOF) {
 119         switch (o) {
 120         case OPT_EOF:
 121         case OPT_ERR:
 122  opthelp:
 123             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 124             goto end;
 125         case OPT_HELP:
 126             opt_help(dgst_options);
 127             ret = 0;
 128             goto end;
 129         case OPT_LIST:
 130             BIO_printf(bio_out, "Supported digests:\n");
 131             dec.bio = bio_out;
 132             dec.n = 0;
 133             OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_MD_METH,
 134                                    show_digests, &dec);
 135             BIO_printf(bio_out, "\n");
 136             ret = 0;
 137             goto end;
 138         case OPT_C:
 139             separator = 1;
 140             break;
 141         case OPT_R:
 142             separator = 2;
 143             break;
 144         case OPT_R_CASES:
 145             if (!opt_rand(o))
 146                 goto end;
 147             break;
 148         case OPT_OUT:
 149             outfile = opt_arg();
 150             break;
 151         case OPT_SIGN:
 152             keyfile = opt_arg();
 153             break;
 154         case OPT_PASSIN:
 155             passinarg = opt_arg();
 156             break;
 157         case OPT_VERIFY:
 158             keyfile = opt_arg();
 159             want_pub = do_verify = 1;
 160             break;
 161         case OPT_PRVERIFY:
 162             keyfile = opt_arg();
 163             do_verify = 1;
 164             break;
 165         case OPT_SIGNATURE:
 166             sigfile = opt_arg();
 167             break;
 168         case OPT_KEYFORM:
 169             if (!opt_format(opt_arg(), OPT_FMT_ANY, &keyform))
 170                 goto opthelp;
 171             break;
 172         case OPT_ENGINE:
 173             e = setup_engine(opt_arg(), 0);
 174             break;
 175         case OPT_ENGINE_IMPL:
 176             engine_impl = 1;
 177             break;
 178         case OPT_HEX:
 179             out_bin = 0;
 180             break;
 181         case OPT_BINARY:
 182             out_bin = 1;
 183             break;
 184         case OPT_XOFLEN:
 185             xoflen = atoi(opt_arg());
 186             break;
 187         case OPT_DEBUG:
 188             debug = 1;
 189             break;
 190         case OPT_FIPS_FINGERPRINT:
 191             hmac_key = "etaonrishdlcupfm";
 192             break;
 193         case OPT_HMAC:
 194             hmac_key = opt_arg();
 195             break;
 196         case OPT_MAC:
 197             mac_name = opt_arg();
 198             break;
 199         case OPT_SIGOPT:
 200             if (!sigopts)
 201                 sigopts = sk_OPENSSL_STRING_new_null();
 202             if (!sigopts || !sk_OPENSSL_STRING_push(sigopts, opt_arg()))
 203                 goto opthelp;
 204             break;
 205         case OPT_MACOPT:
 206             if (!macopts)
 207                 macopts = sk_OPENSSL_STRING_new_null();
 208             if (!macopts || !sk_OPENSSL_STRING_push(macopts, opt_arg()))
 209                 goto opthelp;
 210             break;
 211         case OPT_DIGEST:
 212             digestname = opt_unknown();
 213             break;
 214         case OPT_PROV_CASES:
 215             if (!opt_provider(o))
 216                 goto end;
 217             break;
 218         }
 219     }
 220
 221     /* Remaining args are files to digest. */
 222     argc = opt_num_rest();
 223     argv = opt_rest();
 224     if (keyfile != NULL && argc > 1) {
 225         BIO_printf(bio_err, "%s: Can only sign or verify one file.\n", prog);
 226         goto end;
 227     }
 228     app_RAND_load();
 229     if (digestname != NULL) {
 230         if (!opt_md(digestname, &md))
 231             goto opthelp;
 232     }
 233
 234     if (do_verify && sigfile == NULL) {
 235         BIO_printf(bio_err,
 236                    "No signature to verify: use the -signature option\n");
 237         goto end;
 238     }
 239     if (engine_impl)
 240         impl = e;
 241
 242     in = BIO_new(BIO_s_file());
 243     bmd = BIO_new(BIO_f_md());
 244     if ((in == NULL) || (bmd == NULL)) {
 245         ERR_print_errors(bio_err);
 246         goto end;
 247     }
 248
 249     if (debug) {
 250         BIO_set_callback(in, BIO_debug_callback);
 251         /* needed for windows 3.1 */
 252         BIO_set_callback_arg(in, (char *)bio_err);
 253     }
 254
 255     if (!app_passwd(passinarg, NULL, &passin, NULL)) {
 256         BIO_printf(bio_err, "Error getting password\n");
 257         goto end;
 258     }
 259
 260     if (out_bin == -1) {
 261         if (keyfile != NULL)
 262             out_bin = 1;
 263         else
 264             out_bin = 0;
 265     }
 266
 267     out = bio_open_default(outfile, 'w', out_bin ? FORMAT_BINARY : FORMAT_TEXT);
 268     if (out == NULL)
 269         goto end;
 270
 271     if ((!(mac_name == NULL) + !(keyfile == NULL) + !(hmac_key == NULL)) > 1) {
 272         BIO_printf(bio_err, "MAC and Signing key cannot both be specified\n");
 273         goto end;
 274     }
 275
 276     if (keyfile != NULL) {
 277         int type;
 278
 279         if (want_pub)
 280             sigkey = load_pubkey(keyfile, keyform, 0, NULL, e, "public key");
 281         else
 282             sigkey = load_key(keyfile, keyform, 0, passin, e, "private key");
 283         if (sigkey == NULL) {
 284             /*
 285              * load_[pub]key() has already printed an appropriate message
 286              */
 287             goto end;
 288         }
 289         type = EVP_PKEY_id(sigkey);
 290         if (type == EVP_PKEY_ED25519 || type == EVP_PKEY_ED448) {
 291             /*
 292              * We implement PureEdDSA for these which doesn't have a separate
 293              * digest, and only supports one shot.
 294              */
 295             BIO_printf(bio_err, "Key type not supported for this operation\n");
 296             goto end;
 297         }
 298     }
 299
 300     if (mac_name != NULL) {
 301         EVP_PKEY_CTX *mac_ctx = NULL;
 302         int r = 0;
 303         if (!init_gen_str(&mac_ctx, mac_name, impl, 0, NULL, NULL))
 304             goto mac_end;
 305         if (macopts != NULL) {
 306             char *macopt;
 307             for (i = 0; i < sk_OPENSSL_STRING_num(macopts); i++) {
 308                 macopt = sk_OPENSSL_STRING_value(macopts, i);
 309                 if (pkey_ctrl_string(mac_ctx, macopt) <= 0) {
 310                     BIO_printf(bio_err,
 311                                "MAC parameter error \"%s\"\n", macopt);
 312                     ERR_print_errors(bio_err);
 313                     goto mac_end;
 314                 }
 315             }
 316         }
 317         if (EVP_PKEY_keygen(mac_ctx, &sigkey) <= 0) {
 318             BIO_puts(bio_err, "Error generating key\n");
 319             ERR_print_errors(bio_err);
 320             goto mac_end;
 321         }
 322         r = 1;
 323  mac_end:
 324         EVP_PKEY_CTX_free(mac_ctx);
 325         if (r == 0)
 326             goto end;
 327     }
 328
 329     if (hmac_key != NULL) {
 330         sigkey = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, impl,
 331                                               (unsigned char *)hmac_key,
 332                                               strlen(hmac_key));
 333         if (sigkey == NULL)
 334             goto end;
 335     }
 336
 337     if (sigkey != NULL) {
 338         EVP_MD_CTX *mctx = NULL;
 339         EVP_PKEY_CTX *pctx = NULL;
 340         int r;
 341         if (!BIO_get_md_ctx(bmd, &mctx)) {
 342             BIO_printf(bio_err, "Error getting context\n");
 343             ERR_print_errors(bio_err);
 344             goto end;
 345         }
 346         if (do_verify)
 347             r = EVP_DigestVerifyInit(mctx, &pctx, md, impl, sigkey);
 348         else
 349             r = EVP_DigestSignInit(mctx, &pctx, md, impl, sigkey);
 350         if (!r) {
 351             BIO_printf(bio_err, "Error setting context\n");
 352             ERR_print_errors(bio_err);
 353             goto end;
 354         }
 355         if (sigopts != NULL) {
 356             char *sigopt;
 357             for (i = 0; i < sk_OPENSSL_STRING_num(sigopts); i++) {
 358                 sigopt = sk_OPENSSL_STRING_value(sigopts, i);
 359                 if (pkey_ctrl_string(pctx, sigopt) <= 0) {
 360                     BIO_printf(bio_err, "parameter error \"%s\"\n", sigopt);
 361                     ERR_print_errors(bio_err);
 362                     goto end;
 363                 }
 364             }
 365         }
 366     }
 367     /* we use md as a filter, reading from 'in' */
 368     else {
 369         EVP_MD_CTX *mctx = NULL;
 370         if (!BIO_get_md_ctx(bmd, &mctx)) {
 371             BIO_printf(bio_err, "Error getting context\n");
 372             ERR_print_errors(bio_err);
 373             goto end;
 374         }
 375         if (md == NULL)
 376             md = EVP_sha256();
 377         if (!EVP_DigestInit_ex(mctx, md, impl)) {
 378             BIO_printf(bio_err, "Error setting digest\n");
 379             ERR_print_errors(bio_err);
 380             goto end;
 381         }
 382     }
 383
 384     if (sigfile != NULL && sigkey != NULL) {
 385         BIO *sigbio = BIO_new_file(sigfile, "rb");
 386         if (sigbio == NULL) {
 387             BIO_printf(bio_err, "Error opening signature file %s\n", sigfile);
 388             ERR_print_errors(bio_err);
 389             goto end;
 390         }
 391         siglen = EVP_PKEY_size(sigkey);
 392         sigbuf = app_malloc(siglen, "signature buffer");
 393         siglen = BIO_read(sigbio, sigbuf, siglen);
 394         BIO_free(sigbio);
 395         if (siglen <= 0) {
 396             BIO_printf(bio_err, "Error reading signature file %s\n", sigfile);
 397             ERR_print_errors(bio_err);
 398             goto end;
 399         }
 400     }
 401     inp = BIO_push(bmd, in);
 402
 403     if (md == NULL) {
 404         EVP_MD_CTX *tctx;
 405         BIO_get_md_ctx(bmd, &tctx);
 406         md = EVP_MD_CTX_md(tctx);
 407     }
 408     if (md != NULL)
 409         md_name = EVP_MD_name(md);
 410
 411     if (xoflen > 0) {
 412         if (!(EVP_MD_flags(md) & EVP_MD_FLAG_XOF)) {
 413             BIO_printf(bio_err, "Length can only be specified for XOF\n");
 414             goto end;
 415         }
 416         if (sigkey != NULL) {
 417             BIO_printf(bio_err, "Signing key cannot be specified for XOF\n");
 418             goto end;
 419         }
 420     }
 421
 422     if (argc == 0) {
 423         BIO_set_fp(in, stdin, BIO_NOCLOSE);
 424         ret = do_fp(out, buf, inp, separator, out_bin, xoflen, sigkey, sigbuf,
 425                     siglen, NULL, md_name, "stdin");
 426     } else {
 427         const char *sig_name = NULL;
 428         if (!out_bin) {
 429             if (sigkey != NULL)
 430                 sig_name = EVP_PKEY_get0_first_alg_name(sigkey);
 431         }
 432         ret = 0;
 433         for (i = 0; i < argc; i++) {
 434             int r;
 435             if (BIO_read_filename(in, argv[i]) <= 0) {
 436                 perror(argv[i]);
 437                 ret++;
 438                 continue;
 439             } else {
 440                 r = do_fp(out, buf, inp, separator, out_bin, xoflen,
 441                           sigkey, sigbuf, siglen, sig_name, md_name, argv[i]);
 442             }
 443             if (r)
 444                 ret = r;
 445             (void)BIO_reset(bmd);
 446         }
 447     }
 448  end:
 449     OPENSSL_clear_free(buf, BUFSIZE);
 450     BIO_free(in);
 451     OPENSSL_free(passin);
 452     BIO_free_all(out);
 453     EVP_PKEY_free(sigkey);
 454     sk_OPENSSL_STRING_free(sigopts);
 455     sk_OPENSSL_STRING_free(macopts);
 456     OPENSSL_free(sigbuf);
 457     BIO_free(bmd);
 458     release_engine(e);
 459     return ret;
 460 }
 461
 462 static void show_digests(const OBJ_NAME *name, void *arg)
 463 {
 464     struct doall_dgst_digests *dec = (struct doall_dgst_digests *)arg;
 465     const EVP_MD *md = NULL;
 466
 467     /* Filter out signed digests (a.k.a signature algorithms) */
 468     if (strstr(name->name, "rsa") != NULL || strstr(name->name, "RSA") != NULL)
 469         return;
 470
 471     if (!islower((unsigned char)*name->name))
 472         return;
 473
 474     /* Filter out message digests that we cannot use */
 475     md = EVP_get_digestbyname(name->name);
 476     if (md == NULL)
 477         return;
 478
 479     BIO_printf(dec->bio, "-%-25s", name->name);
 480     if (++dec->n == 3) {
 481         BIO_printf(dec->bio, "\n");
 482         dec->n = 0;
 483     } else {
 484         BIO_printf(dec->bio, " ");
 485     }
 486 }
 487
 488 /*
 489  * The newline_escape_filename function performs newline escaping for any
 490  * filename that contains a newline.  This function also takes a pointer
 491  * to backslash. The backslash pointer is a flag to indicating whether a newline
 492  * is present in the filename.  If a newline is present, the backslash flag is
 493  * set and the output format will contain a backslash at the beginning of the
 494  * digest output. This output format is to replicate the output format found
 495  * in the '*sum' checksum programs. This aims to preserve backward
 496  * compatibility.
 497  */
 498 static const char *newline_escape_filename(const char *file, int * backslash)
 499 {
 500     size_t i, e = 0, length = strlen(file), newline_count = 0, mem_len = 0;
 501     char *file_cpy = NULL;
 502
 503     for (i = 0; i < length; i++)
 504         if (file[i] == '\n')
 505             newline_count++;
 506
 507     mem_len = length + newline_count + 1;
 508     file_cpy = app_malloc(mem_len, file);
 509     i = 0;
 510
 511     while(e < length) {
 512         const char c = file[e];
 513         if (c == '\n') {
 514             file_cpy[i++] = '\\';
 515             file_cpy[i++] = 'n';
 516             *backslash = 1;
 517         } else {
 518             file_cpy[i++] = c;
 519         }
 520         e++;
 521     }
 522     file_cpy[i] = '\0';
 523     return (const char*)file_cpy;
 524 }
 525
 526
 527 int do_fp(BIO *out, unsigned char *buf, BIO *bp, int sep, int binout, int xoflen,
 528           EVP_PKEY *key, unsigned char *sigin, int siglen,
 529           const char *sig_name, const char *md_name,
 530           const char *file)
 531 {
 532     size_t len = BUFSIZE;
 533     int i, backslash = 0, ret = 1;
 534     unsigned char *allocated_buf = NULL;
 535
 536     while (BIO_pending(bp) || !BIO_eof(bp)) {
 537         i = BIO_read(bp, (char *)buf, BUFSIZE);
 538         if (i < 0) {
 539             BIO_printf(bio_err, "Read Error in %s\n", file);
 540             ERR_print_errors(bio_err);
 541             goto end;
 542         }
 543         if (i == 0)
 544             break;
 545     }
 546     if (sigin != NULL) {
 547         EVP_MD_CTX *ctx;
 548         BIO_get_md_ctx(bp, &ctx);
 549         i = EVP_DigestVerifyFinal(ctx, sigin, (unsigned int)siglen);
 550         if (i > 0) {
 551             BIO_printf(out, "Verified OK\n");
 552         } else if (i == 0) {
 553             BIO_printf(out, "Verification Failure\n");
 554             goto end;
 555         } else {
 556             BIO_printf(bio_err, "Error Verifying Data\n");
 557             ERR_print_errors(bio_err);
 558             goto end;
 559         }
 560         ret = 0;
 561         goto end;
 562     }
 563     if (key != NULL) {
 564         EVP_MD_CTX *ctx;
 565         size_t tmplen;
 566
 567         BIO_get_md_ctx(bp, &ctx);
 568         if (!EVP_DigestSignFinal(ctx, NULL, &tmplen)) {
 569             BIO_printf(bio_err, "Error Signing Data\n");
 570             ERR_print_errors(bio_err);
 571             goto end;
 572         }
 573         if (tmplen > BUFSIZE) {
 574             len = tmplen;
 575             allocated_buf = app_malloc(len, "Signature buffer");
 576             buf = allocated_buf;
 577         }
 578         if (!EVP_DigestSignFinal(ctx, buf, &len)) {
 579             BIO_printf(bio_err, "Error Signing Data\n");
 580             ERR_print_errors(bio_err);
 581             goto end;
 582         }
 583     } else if (xoflen > 0) {
 584         EVP_MD_CTX *ctx;
 585
 586         len = xoflen;
 587         if (len > BUFSIZE) {
 588             allocated_buf = app_malloc(len, "Digest buffer");
 589             buf = allocated_buf;
 590         }
 591
 592         BIO_get_md_ctx(bp, &ctx);
 593
 594         if (!EVP_DigestFinalXOF(ctx, buf, len)) {
 595             BIO_printf(bio_err, "Error Digesting Data\n");
 596             ERR_print_errors(bio_err);
 597             goto end;
 598         }
 599     } else {
 600         len = BIO_gets(bp, (char *)buf, BUFSIZE);
 601         if ((int)len < 0) {
 602             ERR_print_errors(bio_err);
 603             goto end;
 604         }
 605     }
 606
 607     if (binout) {
 608         BIO_write(out, buf, len);
 609     } else if (sep == 2) {
 610         file = newline_escape_filename(file, &backslash);
 611
 612         if (backslash == 1)
 613             BIO_puts(out, "\\");
 614
 615         for (i = 0; i < (int)len; i++)
 616             BIO_printf(out, "%02x", buf[i]);
 617
 618         BIO_printf(out, " *%s\n", file);
 619         OPENSSL_free((char *)file);
 620     } else {
 621         if (sig_name != NULL) {
 622             BIO_puts(out, sig_name);
 623             if (md_name != NULL)
 624                 BIO_printf(out, "-%s", md_name);
 625             BIO_printf(out, "(%s)= ", file);
 626         } else if (md_name != NULL) {
 627             BIO_printf(out, "%s(%s)= ", md_name, file);
 628         } else {
 629             BIO_printf(out, "(%s)= ", file);
 630         }
 631         for (i = 0; i < (int)len; i++) {
 632             if (sep && (i != 0))
 633                 BIO_printf(out, ":");
 634             BIO_printf(out, "%02x", buf[i]);
 635         }
 636         BIO_printf(out, "\n");
 637     }
 638
 639     ret = 0;
 640  end:
 641     if (allocated_buf != NULL)
 642         OPENSSL_clear_free(allocated_buf, len);
 643
 644     return ret;
 645 }