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;
 101     char *passinarg = NULL, *passin = NULL;
 102     const EVP_MD *md = NULL, *m;
 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             if (!opt_md(opt_unknown(), &m))
 213                 goto opthelp;
 214             md = m;
 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
 231     if (do_verify && sigfile == NULL) {
 232         BIO_printf(bio_err,
 233                    "No signature to verify: use the -signature option\n");
 234         goto end;
 235     }
 236     if (engine_impl)
 237         impl = e;
 238
 239     in = BIO_new(BIO_s_file());
 240     bmd = BIO_new(BIO_f_md());
 241     if ((in == NULL) || (bmd == NULL)) {
 242         ERR_print_errors(bio_err);
 243         goto end;
 244     }
 245
 246     if (debug) {
 247         BIO_set_callback(in, BIO_debug_callback);
 248         /* needed for windows 3.1 */
 249         BIO_set_callback_arg(in, (char *)bio_err);
 250     }
 251
 252     if (!app_passwd(passinarg, NULL, &passin, NULL)) {
 253         BIO_printf(bio_err, "Error getting password\n");
 254         goto end;
 255     }
 256
 257     if (out_bin == -1) {
 258         if (keyfile != NULL)
 259             out_bin = 1;
 260         else
 261             out_bin = 0;
 262     }
 263
 264     out = bio_open_default(outfile, 'w', out_bin ? FORMAT_BINARY : FORMAT_TEXT);
 265     if (out == NULL)
 266         goto end;
 267
 268     if ((!(mac_name == NULL) + !(keyfile == NULL) + !(hmac_key == NULL)) > 1) {
 269         BIO_printf(bio_err, "MAC and Signing key cannot both be specified\n");
 270         goto end;
 271     }
 272
 273     if (keyfile != NULL) {
 274         int type;
 275
 276         if (want_pub)
 277             sigkey = load_pubkey(keyfile, keyform, 0, NULL, e, "public key");
 278         else
 279             sigkey = load_key(keyfile, keyform, 0, passin, e, "private key");
 280         if (sigkey == NULL) {
 281             /*
 282              * load_[pub]key() has already printed an appropriate message
 283              */
 284             goto end;
 285         }
 286         type = EVP_PKEY_id(sigkey);
 287         if (type == EVP_PKEY_ED25519 || type == EVP_PKEY_ED448) {
 288             /*
 289              * We implement PureEdDSA for these which doesn't have a separate
 290              * digest, and only supports one shot.
 291              */
 292             BIO_printf(bio_err, "Key type not supported for this operation\n");
 293             goto end;
 294         }
 295     }
 296
 297     if (mac_name != NULL) {
 298         EVP_PKEY_CTX *mac_ctx = NULL;
 299         int r = 0;
 300         if (!init_gen_str(&mac_ctx, mac_name, impl, 0, NULL, NULL))
 301             goto mac_end;
 302         if (macopts != NULL) {
 303             char *macopt;
 304             for (i = 0; i < sk_OPENSSL_STRING_num(macopts); i++) {
 305                 macopt = sk_OPENSSL_STRING_value(macopts, i);
 306                 if (pkey_ctrl_string(mac_ctx, macopt) <= 0) {
 307                     BIO_printf(bio_err,
 308                                "MAC parameter error \"%s\"\n", macopt);
 309                     ERR_print_errors(bio_err);
 310                     goto mac_end;
 311                 }
 312             }
 313         }
 314         if (EVP_PKEY_keygen(mac_ctx, &sigkey) <= 0) {
 315             BIO_puts(bio_err, "Error generating key\n");
 316             ERR_print_errors(bio_err);
 317             goto mac_end;
 318         }
 319         r = 1;
 320  mac_end:
 321         EVP_PKEY_CTX_free(mac_ctx);
 322         if (r == 0)
 323             goto end;
 324     }
 325
 326     if (hmac_key != NULL) {
 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 r;
 338         if (!BIO_get_md_ctx(bmd, &mctx)) {
 339             BIO_printf(bio_err, "Error getting context\n");
 340             ERR_print_errors(bio_err);
 341             goto end;
 342         }
 343         if (do_verify)
 344             r = EVP_DigestVerifyInit(mctx, &pctx, md, impl, sigkey);
 345         else
 346             r = EVP_DigestSignInit(mctx, &pctx, md, impl, sigkey);
 347         if (!r) {
 348             BIO_printf(bio_err, "Error setting context\n");
 349             ERR_print_errors(bio_err);
 350             goto end;
 351         }
 352         if (sigopts != NULL) {
 353             char *sigopt;
 354             for (i = 0; i < sk_OPENSSL_STRING_num(sigopts); i++) {
 355                 sigopt = sk_OPENSSL_STRING_value(sigopts, i);
 356                 if (pkey_ctrl_string(pctx, sigopt) <= 0) {
 357                     BIO_printf(bio_err, "parameter error \"%s\"\n", sigopt);
 358                     ERR_print_errors(bio_err);
 359                     goto end;
 360                 }
 361             }
 362         }
 363     }
 364     /* we use md as a filter, reading from 'in' */
 365     else {
 366         EVP_MD_CTX *mctx = NULL;
 367         if (!BIO_get_md_ctx(bmd, &mctx)) {
 368             BIO_printf(bio_err, "Error getting context\n");
 369             ERR_print_errors(bio_err);
 370             goto end;
 371         }
 372         if (md == NULL)
 373             md = EVP_sha256();
 374         if (!EVP_DigestInit_ex(mctx, md, impl)) {
 375             BIO_printf(bio_err, "Error setting digest\n");
 376             ERR_print_errors(bio_err);
 377             goto end;
 378         }
 379     }
 380
 381     if (sigfile != NULL && sigkey != NULL) {
 382         BIO *sigbio = BIO_new_file(sigfile, "rb");
 383         if (sigbio == NULL) {
 384             BIO_printf(bio_err, "Error opening signature file %s\n", sigfile);
 385             ERR_print_errors(bio_err);
 386             goto end;
 387         }
 388         siglen = EVP_PKEY_size(sigkey);
 389         sigbuf = app_malloc(siglen, "signature buffer");
 390         siglen = BIO_read(sigbio, sigbuf, siglen);
 391         BIO_free(sigbio);
 392         if (siglen <= 0) {
 393             BIO_printf(bio_err, "Error reading signature file %s\n", sigfile);
 394             ERR_print_errors(bio_err);
 395             goto end;
 396         }
 397     }
 398     inp = BIO_push(bmd, in);
 399
 400     if (md == NULL) {
 401         EVP_MD_CTX *tctx;
 402         BIO_get_md_ctx(bmd, &tctx);
 403         md = EVP_MD_CTX_md(tctx);
 404     }
 405     if (md != NULL)
 406         md_name = EVP_MD_name(md);
 407
 408     if (xoflen > 0) {
 409         if (!(EVP_MD_flags(md) & EVP_MD_FLAG_XOF)) {
 410             BIO_printf(bio_err, "Length can only be specified for XOF\n");
 411             goto end;
 412         }
 413         if (sigkey != NULL) {
 414             BIO_printf(bio_err, "Signing key cannot be specified for XOF\n");
 415             goto end;
 416         }
 417     }
 418
 419     if (argc == 0) {
 420         BIO_set_fp(in, stdin, BIO_NOCLOSE);
 421         ret = do_fp(out, buf, inp, separator, out_bin, xoflen, sigkey, sigbuf,
 422                     siglen, NULL, md_name, "stdin");
 423     } else {
 424         const char *sig_name = NULL;
 425         if (!out_bin) {
 426             if (sigkey != NULL)
 427                 sig_name = EVP_PKEY_get0_first_alg_name(sigkey);
 428         }
 429         ret = 0;
 430         for (i = 0; i < argc; i++) {
 431             int r;
 432             if (BIO_read_filename(in, argv[i]) <= 0) {
 433                 perror(argv[i]);
 434                 ret++;
 435                 continue;
 436             } else {
 437                 r = do_fp(out, buf, inp, separator, out_bin, xoflen,
 438                           sigkey, sigbuf, siglen, sig_name, md_name, argv[i]);
 439             }
 440             if (r)
 441                 ret = r;
 442             (void)BIO_reset(bmd);
 443         }
 444     }
 445  end:
 446     OPENSSL_clear_free(buf, BUFSIZE);
 447     BIO_free(in);
 448     OPENSSL_free(passin);
 449     BIO_free_all(out);
 450     EVP_PKEY_free(sigkey);
 451     sk_OPENSSL_STRING_free(sigopts);
 452     sk_OPENSSL_STRING_free(macopts);
 453     OPENSSL_free(sigbuf);
 454     BIO_free(bmd);
 455     release_engine(e);
 456     return ret;
 457 }
 458
 459 static void show_digests(const OBJ_NAME *name, void *arg)
 460 {
 461     struct doall_dgst_digests *dec = (struct doall_dgst_digests *)arg;
 462     const EVP_MD *md = NULL;
 463
 464     /* Filter out signed digests (a.k.a signature algorithms) */
 465     if (strstr(name->name, "rsa") != NULL || strstr(name->name, "RSA") != NULL)
 466         return;
 467
 468     if (!islower((unsigned char)*name->name))
 469         return;
 470
 471     /* Filter out message digests that we cannot use */
 472     md = EVP_get_digestbyname(name->name);
 473     if (md == NULL)
 474         return;
 475
 476     BIO_printf(dec->bio, "-%-25s", name->name);
 477     if (++dec->n == 3) {
 478         BIO_printf(dec->bio, "\n");
 479         dec->n = 0;
 480     } else {
 481         BIO_printf(dec->bio, " ");
 482     }
 483 }
 484
 485 /*
 486  * The newline_escape_filename function performs newline escaping for any
 487  * filename that contains a newline.  This function also takes a pointer
 488  * to backslash. The backslash pointer is a flag to indicating whether a newline
 489  * is present in the filename.  If a newline is present, the backslash flag is
 490  * set and the output format will contain a backslash at the beginning of the
 491  * digest output. This output format is to replicate the output format found
 492  * in the '*sum' checksum programs. This aims to preserve backward
 493  * compatibility.
 494  */
 495 static const char *newline_escape_filename(const char *file, int * backslash)
 496 {
 497     size_t i, e = 0, length = strlen(file), newline_count = 0, mem_len = 0;
 498     char *file_cpy = NULL;
 499
 500     for (i = 0; i < length; i++)
 501         if (file[i] == '\n')
 502             newline_count++;
 503
 504     mem_len = length + newline_count + 1;
 505     file_cpy = app_malloc(mem_len, file);
 506     i = 0;
 507
 508     while(e < length) {
 509         const char c = file[e];
 510         if (c == '\n') {
 511             file_cpy[i++] = '\\';
 512             file_cpy[i++] = 'n';
 513             *backslash = 1;
 514         } else {
 515             file_cpy[i++] = c;
 516         }
 517         e++;
 518     }
 519     file_cpy[i] = '\0';
 520     return (const char*)file_cpy;
 521 }
 522
 523
 524 int do_fp(BIO *out, unsigned char *buf, BIO *bp, int sep, int binout, int xoflen,
 525           EVP_PKEY *key, unsigned char *sigin, int siglen,
 526           const char *sig_name, const char *md_name,
 527           const char *file)
 528 {
 529     size_t len = BUFSIZE;
 530     int i, backslash = 0, ret = 1;
 531     unsigned char *allocated_buf = NULL;
 532
 533     while (BIO_pending(bp) || !BIO_eof(bp)) {
 534         i = BIO_read(bp, (char *)buf, BUFSIZE);
 535         if (i < 0) {
 536             BIO_printf(bio_err, "Read Error in %s\n", file);
 537             ERR_print_errors(bio_err);
 538             goto end;
 539         }
 540         if (i == 0)
 541             break;
 542     }
 543     if (sigin != NULL) {
 544         EVP_MD_CTX *ctx;
 545         BIO_get_md_ctx(bp, &ctx);
 546         i = EVP_DigestVerifyFinal(ctx, sigin, (unsigned int)siglen);
 547         if (i > 0) {
 548             BIO_printf(out, "Verified OK\n");
 549         } else if (i == 0) {
 550             BIO_printf(out, "Verification Failure\n");
 551             goto end;
 552         } else {
 553             BIO_printf(bio_err, "Error Verifying Data\n");
 554             ERR_print_errors(bio_err);
 555             goto end;
 556         }
 557         ret = 0;
 558         goto end;
 559     }
 560     if (key != NULL) {
 561         EVP_MD_CTX *ctx;
 562         size_t tmplen;
 563
 564         BIO_get_md_ctx(bp, &ctx);
 565         if (!EVP_DigestSignFinal(ctx, NULL, &tmplen)) {
 566             BIO_printf(bio_err, "Error Signing Data\n");
 567             ERR_print_errors(bio_err);
 568             goto end;
 569         }
 570         if (tmplen > BUFSIZE) {
 571             len = tmplen;
 572             allocated_buf = app_malloc(len, "Signature buffer");
 573             buf = allocated_buf;
 574         }
 575         if (!EVP_DigestSignFinal(ctx, buf, &len)) {
 576             BIO_printf(bio_err, "Error Signing Data\n");
 577             ERR_print_errors(bio_err);
 578             goto end;
 579         }
 580     } else if (xoflen > 0) {
 581         EVP_MD_CTX *ctx;
 582
 583         len = xoflen;
 584         if (len > BUFSIZE) {
 585             allocated_buf = app_malloc(len, "Digest buffer");
 586             buf = allocated_buf;
 587         }
 588
 589         BIO_get_md_ctx(bp, &ctx);
 590
 591         if (!EVP_DigestFinalXOF(ctx, buf, len)) {
 592             BIO_printf(bio_err, "Error Digesting Data\n");
 593             ERR_print_errors(bio_err);
 594             goto end;
 595         }
 596     } else {
 597         len = BIO_gets(bp, (char *)buf, BUFSIZE);
 598         if ((int)len < 0) {
 599             ERR_print_errors(bio_err);
 600             goto end;
 601         }
 602     }
 603
 604     if (binout) {
 605         BIO_write(out, buf, len);
 606     } else if (sep == 2) {
 607         file = newline_escape_filename(file, &backslash);
 608
 609         if (backslash == 1)
 610             BIO_puts(out, "\\");
 611
 612         for (i = 0; i < (int)len; i++)
 613             BIO_printf(out, "%02x", buf[i]);
 614
 615         BIO_printf(out, " *%s\n", file);
 616         OPENSSL_free((char *)file);
 617     } else {
 618         if (sig_name != NULL) {
 619             BIO_puts(out, sig_name);
 620             if (md_name != NULL)
 621                 BIO_printf(out, "-%s", md_name);
 622             BIO_printf(out, "(%s)= ", file);
 623         } else if (md_name != NULL) {
 624             BIO_printf(out, "%s(%s)= ", md_name, file);
 625         } else {
 626             BIO_printf(out, "(%s)= ", file);
 627         }
 628         for (i = 0; i < (int)len; i++) {
 629             if (sep && (i != 0))
 630                 BIO_printf(out, ":");
 631             BIO_printf(out, "%02x", buf[i]);
 632         }
 633         BIO_printf(out, "\n");
 634     }
 635
 636     ret = 0;
 637  end:
 638     if (allocated_buf != NULL)
 639         OPENSSL_clear_free(allocated_buf, len);
 640
 641     return ret;
 642 }