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     if (!app_RAND_load())
 229         goto end;
 230
 231     if (digestname != NULL) {
 232         if (!opt_md(digestname, &md))
 233             goto opthelp;
 234     }
 235
 236     if (do_verify && sigfile == NULL) {
 237         BIO_printf(bio_err,
 238                    "No signature to verify: use the -signature option\n");
 239         goto end;
 240     }
 241     if (engine_impl)
 242         impl = e;
 243
 244     in = BIO_new(BIO_s_file());
 245     bmd = BIO_new(BIO_f_md());
 246     if ((in == NULL) || (bmd == NULL)) {
 247         ERR_print_errors(bio_err);
 248         goto end;
 249     }
 250
 251     if (debug) {
 252         BIO_set_callback(in, BIO_debug_callback);
 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_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         int r = 0;
 305         if (!init_gen_str(&mac_ctx, mac_name, impl, 0, NULL, NULL))
 306             goto mac_end;
 307         if (macopts != NULL) {
 308             char *macopt;
 309             for (i = 0; i < sk_OPENSSL_STRING_num(macopts); i++) {
 310                 macopt = sk_OPENSSL_STRING_value(macopts, i);
 311                 if (pkey_ctrl_string(mac_ctx, macopt) <= 0) {
 312                     BIO_printf(bio_err,
 313                                "MAC parameter error \"%s\"\n", macopt);
 314                     ERR_print_errors(bio_err);
 315                     goto mac_end;
 316                 }
 317             }
 318         }
 319         if (EVP_PKEY_keygen(mac_ctx, &sigkey) <= 0) {
 320             BIO_puts(bio_err, "Error generating key\n");
 321             ERR_print_errors(bio_err);
 322             goto mac_end;
 323         }
 324         r = 1;
 325  mac_end:
 326         EVP_PKEY_CTX_free(mac_ctx);
 327         if (r == 0)
 328             goto end;
 329     }
 330
 331     if (hmac_key != NULL) {
 332         sigkey = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, impl,
 333                                               (unsigned char *)hmac_key,
 334                                               strlen(hmac_key));
 335         if (sigkey == NULL)
 336             goto end;
 337     }
 338
 339     if (sigkey != NULL) {
 340         EVP_MD_CTX *mctx = NULL;
 341         EVP_PKEY_CTX *pctx = NULL;
 342         int r;
 343         if (!BIO_get_md_ctx(bmd, &mctx)) {
 344             BIO_printf(bio_err, "Error getting context\n");
 345             ERR_print_errors(bio_err);
 346             goto end;
 347         }
 348         if (do_verify)
 349             r = EVP_DigestVerifyInit(mctx, &pctx, md, impl, sigkey);
 350         else
 351             r = EVP_DigestSignInit(mctx, &pctx, md, impl, sigkey);
 352         if (!r) {
 353             BIO_printf(bio_err, "Error setting context\n");
 354             ERR_print_errors(bio_err);
 355             goto end;
 356         }
 357         if (sigopts != NULL) {
 358             char *sigopt;
 359             for (i = 0; i < sk_OPENSSL_STRING_num(sigopts); i++) {
 360                 sigopt = sk_OPENSSL_STRING_value(sigopts, i);
 361                 if (pkey_ctrl_string(pctx, sigopt) <= 0) {
 362                     BIO_printf(bio_err, "parameter error \"%s\"\n", sigopt);
 363                     ERR_print_errors(bio_err);
 364                     goto end;
 365                 }
 366             }
 367         }
 368     }
 369     /* we use md as a filter, reading from 'in' */
 370     else {
 371         EVP_MD_CTX *mctx = NULL;
 372         if (!BIO_get_md_ctx(bmd, &mctx)) {
 373             BIO_printf(bio_err, "Error getting context\n");
 374             ERR_print_errors(bio_err);
 375             goto end;
 376         }
 377         if (md == NULL)
 378             md = EVP_sha256();
 379         if (!EVP_DigestInit_ex(mctx, md, impl)) {
 380             BIO_printf(bio_err, "Error setting digest\n");
 381             ERR_print_errors(bio_err);
 382             goto end;
 383         }
 384     }
 385
 386     if (sigfile != NULL && sigkey != NULL) {
 387         BIO *sigbio = BIO_new_file(sigfile, "rb");
 388         if (sigbio == NULL) {
 389             BIO_printf(bio_err, "Error opening signature file %s\n", sigfile);
 390             ERR_print_errors(bio_err);
 391             goto end;
 392         }
 393         siglen = EVP_PKEY_size(sigkey);
 394         sigbuf = app_malloc(siglen, "signature buffer");
 395         siglen = BIO_read(sigbio, sigbuf, siglen);
 396         BIO_free(sigbio);
 397         if (siglen <= 0) {
 398             BIO_printf(bio_err, "Error reading signature file %s\n", sigfile);
 399             ERR_print_errors(bio_err);
 400             goto end;
 401         }
 402     }
 403     inp = BIO_push(bmd, in);
 404
 405     if (md == NULL) {
 406         EVP_MD_CTX *tctx;
 407         BIO_get_md_ctx(bmd, &tctx);
 408         md = EVP_MD_CTX_md(tctx);
 409     }
 410     if (md != NULL)
 411         md_name = EVP_MD_name(md);
 412
 413     if (xoflen > 0) {
 414         if (!(EVP_MD_flags(md) & EVP_MD_FLAG_XOF)) {
 415             BIO_printf(bio_err, "Length can only be specified for XOF\n");
 416             goto end;
 417         }
 418         if (sigkey != NULL) {
 419             BIO_printf(bio_err, "Signing key cannot be specified for XOF\n");
 420             goto end;
 421         }
 422     }
 423
 424     if (argc == 0) {
 425         BIO_set_fp(in, stdin, BIO_NOCLOSE);
 426         ret = do_fp(out, buf, inp, separator, out_bin, xoflen, sigkey, sigbuf,
 427                     siglen, NULL, md_name, "stdin");
 428     } else {
 429         const char *sig_name = NULL;
 430         if (!out_bin) {
 431             if (sigkey != NULL)
 432                 sig_name = EVP_PKEY_get0_type_name(sigkey);
 433         }
 434         ret = 0;
 435         for (i = 0; i < argc; i++) {
 436             int r;
 437             if (BIO_read_filename(in, argv[i]) <= 0) {
 438                 perror(argv[i]);
 439                 ret++;
 440                 continue;
 441             } else {
 442                 r = do_fp(out, buf, inp, separator, out_bin, xoflen,
 443                           sigkey, sigbuf, siglen, sig_name, md_name, argv[i]);
 444             }
 445             if (r)
 446                 ret = r;
 447             (void)BIO_reset(bmd);
 448         }
 449     }
 450  end:
 451     OPENSSL_clear_free(buf, BUFSIZE);
 452     BIO_free(in);
 453     OPENSSL_free(passin);
 454     BIO_free_all(out);
 455     EVP_PKEY_free(sigkey);
 456     sk_OPENSSL_STRING_free(sigopts);
 457     sk_OPENSSL_STRING_free(macopts);
 458     OPENSSL_free(sigbuf);
 459     BIO_free(bmd);
 460     release_engine(e);
 461     return ret;
 462 }
 463
 464 static void show_digests(const OBJ_NAME *name, void *arg)
 465 {
 466     struct doall_dgst_digests *dec = (struct doall_dgst_digests *)arg;
 467     const EVP_MD *md = NULL;
 468
 469     /* Filter out signed digests (a.k.a signature algorithms) */
 470     if (strstr(name->name, "rsa") != NULL || strstr(name->name, "RSA") != NULL)
 471         return;
 472
 473     if (!islower((unsigned char)*name->name))
 474         return;
 475
 476     /* Filter out message digests that we cannot use */
 477     md = EVP_get_digestbyname(name->name);
 478     if (md == NULL)
 479         return;
 480
 481     BIO_printf(dec->bio, "-%-25s", name->name);
 482     if (++dec->n == 3) {
 483         BIO_printf(dec->bio, "\n");
 484         dec->n = 0;
 485     } else {
 486         BIO_printf(dec->bio, " ");
 487     }
 488 }
 489
 490 /*
 491  * The newline_escape_filename function performs newline escaping for any
 492  * filename that contains a newline.  This function also takes a pointer
 493  * to backslash. The backslash pointer is a flag to indicating whether a newline
 494  * is present in the filename.  If a newline is present, the backslash flag is
 495  * set and the output format will contain a backslash at the beginning of the
 496  * digest output. This output format is to replicate the output format found
 497  * in the '*sum' checksum programs. This aims to preserve backward
 498  * compatibility.
 499  */
 500 static const char *newline_escape_filename(const char *file, int * backslash)
 501 {
 502     size_t i, e = 0, length = strlen(file), newline_count = 0, mem_len = 0;
 503     char *file_cpy = NULL;
 504
 505     for (i = 0; i < length; i++)
 506         if (file[i] == '\n')
 507             newline_count++;
 508
 509     mem_len = length + newline_count + 1;
 510     file_cpy = app_malloc(mem_len, file);
 511     i = 0;
 512
 513     while(e < length) {
 514         const char c = file[e];
 515         if (c == '\n') {
 516             file_cpy[i++] = '\\';
 517             file_cpy[i++] = 'n';
 518             *backslash = 1;
 519         } else {
 520             file_cpy[i++] = c;
 521         }
 522         e++;
 523     }
 524     file_cpy[i] = '\0';
 525     return (const char*)file_cpy;
 526 }
 527
 528
 529 int do_fp(BIO *out, unsigned char *buf, BIO *bp, int sep, int binout, int xoflen,
 530           EVP_PKEY *key, unsigned char *sigin, int siglen,
 531           const char *sig_name, const char *md_name,
 532           const char *file)
 533 {
 534     size_t len = BUFSIZE;
 535     int i, backslash = 0, ret = 1;
 536     unsigned char *allocated_buf = NULL;
 537
 538     while (BIO_pending(bp) || !BIO_eof(bp)) {
 539         i = BIO_read(bp, (char *)buf, BUFSIZE);
 540         if (i < 0) {
 541             BIO_printf(bio_err, "Read Error in %s\n", file);
 542             ERR_print_errors(bio_err);
 543             goto end;
 544         }
 545         if (i == 0)
 546             break;
 547     }
 548     if (sigin != NULL) {
 549         EVP_MD_CTX *ctx;
 550         BIO_get_md_ctx(bp, &ctx);
 551         i = EVP_DigestVerifyFinal(ctx, sigin, (unsigned int)siglen);
 552         if (i > 0) {
 553             BIO_printf(out, "Verified OK\n");
 554         } else if (i == 0) {
 555             BIO_printf(out, "Verification Failure\n");
 556             goto end;
 557         } else {
 558             BIO_printf(bio_err, "Error Verifying Data\n");
 559             ERR_print_errors(bio_err);
 560             goto end;
 561         }
 562         ret = 0;
 563         goto end;
 564     }
 565     if (key != NULL) {
 566         EVP_MD_CTX *ctx;
 567         size_t tmplen;
 568
 569         BIO_get_md_ctx(bp, &ctx);
 570         if (!EVP_DigestSignFinal(ctx, NULL, &tmplen)) {
 571             BIO_printf(bio_err, "Error Signing Data\n");
 572             ERR_print_errors(bio_err);
 573             goto end;
 574         }
 575         if (tmplen > BUFSIZE) {
 576             len = tmplen;
 577             allocated_buf = app_malloc(len, "Signature buffer");
 578             buf = allocated_buf;
 579         }
 580         if (!EVP_DigestSignFinal(ctx, buf, &len)) {
 581             BIO_printf(bio_err, "Error Signing Data\n");
 582             ERR_print_errors(bio_err);
 583             goto end;
 584         }
 585     } else if (xoflen > 0) {
 586         EVP_MD_CTX *ctx;
 587
 588         len = xoflen;
 589         if (len > BUFSIZE) {
 590             allocated_buf = app_malloc(len, "Digest buffer");
 591             buf = allocated_buf;
 592         }
 593
 594         BIO_get_md_ctx(bp, &ctx);
 595
 596         if (!EVP_DigestFinalXOF(ctx, buf, len)) {
 597             BIO_printf(bio_err, "Error Digesting Data\n");
 598             ERR_print_errors(bio_err);
 599             goto end;
 600         }
 601     } else {
 602         len = BIO_gets(bp, (char *)buf, BUFSIZE);
 603         if ((int)len < 0) {
 604             ERR_print_errors(bio_err);
 605             goto end;
 606         }
 607     }
 608
 609     if (binout) {
 610         BIO_write(out, buf, len);
 611     } else if (sep == 2) {
 612         file = newline_escape_filename(file, &backslash);
 613
 614         if (backslash == 1)
 615             BIO_puts(out, "\\");
 616
 617         for (i = 0; i < (int)len; i++)
 618             BIO_printf(out, "%02x", buf[i]);
 619
 620         BIO_printf(out, " *%s\n", file);
 621         OPENSSL_free((char *)file);
 622     } else {
 623         if (sig_name != NULL) {
 624             BIO_puts(out, sig_name);
 625             if (md_name != NULL)
 626                 BIO_printf(out, "-%s", md_name);
 627             BIO_printf(out, "(%s)= ", file);
 628         } else if (md_name != NULL) {
 629             BIO_printf(out, "%s(%s)= ", md_name, file);
 630         } else {
 631             BIO_printf(out, "(%s)= ", file);
 632         }
 633         for (i = 0; i < (int)len; i++) {
 634             if (sep && (i != 0))
 635                 BIO_printf(out, ":");
 636             BIO_printf(out, "%02x", buf[i]);
 637         }
 638         BIO_printf(out, "\n");
 639     }
 640
 641     ret = 0;
 642  end:
 643     if (allocated_buf != NULL)
 644         OPENSSL_clear_free(allocated_buf, len);
 645
 646     return ret;
 647 }