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     app_RAND_load();
 231
 232     if (do_verify && sigfile == NULL) {
 233         BIO_printf(bio_err,
 234                    "No signature to verify: use the -signature option\n");
 235         goto end;
 236     }
 237     if (engine_impl)
 238         impl = e;
 239
 240     in = BIO_new(BIO_s_file());
 241     bmd = BIO_new(BIO_f_md());
 242     if ((in == NULL) || (bmd == NULL)) {
 243         ERR_print_errors(bio_err);
 244         goto end;
 245     }
 246
 247     if (debug) {
 248         BIO_set_callback(in, BIO_debug_callback);
 249         /* needed for windows 3.1 */
 250         BIO_set_callback_arg(in, (char *)bio_err);
 251     }
 252
 253     if (!app_passwd(passinarg, NULL, &passin, NULL)) {
 254         BIO_printf(bio_err, "Error getting password\n");
 255         goto end;
 256     }
 257
 258     if (out_bin == -1) {
 259         if (keyfile != NULL)
 260             out_bin = 1;
 261         else
 262             out_bin = 0;
 263     }
 264
 265     out = bio_open_default(outfile, 'w', out_bin ? FORMAT_BINARY : FORMAT_TEXT);
 266     if (out == NULL)
 267         goto end;
 268
 269     if ((!(mac_name == NULL) + !(keyfile == NULL) + !(hmac_key == NULL)) > 1) {
 270         BIO_printf(bio_err, "MAC and Signing key cannot both be specified\n");
 271         goto end;
 272     }
 273
 274     if (keyfile != NULL) {
 275         int type;
 276
 277         if (want_pub)
 278             sigkey = load_pubkey(keyfile, keyform, 0, NULL, e, "public key");
 279         else
 280             sigkey = load_key(keyfile, keyform, 0, passin, e, "private key");
 281         if (sigkey == NULL) {
 282             /*
 283              * load_[pub]key() has already printed an appropriate message
 284              */
 285             goto end;
 286         }
 287         type = EVP_PKEY_id(sigkey);
 288         if (type == EVP_PKEY_ED25519 || type == EVP_PKEY_ED448) {
 289             /*
 290              * We implement PureEdDSA for these which doesn't have a separate
 291              * digest, and only supports one shot.
 292              */
 293             BIO_printf(bio_err, "Key type not supported for this operation\n");
 294             goto end;
 295         }
 296     }
 297
 298     if (mac_name != NULL) {
 299         EVP_PKEY_CTX *mac_ctx = NULL;
 300         int r = 0;
 301         if (!init_gen_str(&mac_ctx, mac_name, impl, 0, NULL, NULL))
 302             goto mac_end;
 303         if (macopts != NULL) {
 304             char *macopt;
 305             for (i = 0; i < sk_OPENSSL_STRING_num(macopts); i++) {
 306                 macopt = sk_OPENSSL_STRING_value(macopts, i);
 307                 if (pkey_ctrl_string(mac_ctx, macopt) <= 0) {
 308                     BIO_printf(bio_err,
 309                                "MAC parameter error \"%s\"\n", macopt);
 310                     ERR_print_errors(bio_err);
 311                     goto mac_end;
 312                 }
 313             }
 314         }
 315         if (EVP_PKEY_keygen(mac_ctx, &sigkey) <= 0) {
 316             BIO_puts(bio_err, "Error generating key\n");
 317             ERR_print_errors(bio_err);
 318             goto mac_end;
 319         }
 320         r = 1;
 321  mac_end:
 322         EVP_PKEY_CTX_free(mac_ctx);
 323         if (r == 0)
 324             goto end;
 325     }
 326
 327     if (hmac_key != NULL) {
 328         sigkey = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, impl,
 329                                               (unsigned char *)hmac_key,
 330                                               strlen(hmac_key));
 331         if (sigkey == NULL)
 332             goto end;
 333     }
 334
 335     if (sigkey != NULL) {
 336         EVP_MD_CTX *mctx = NULL;
 337         EVP_PKEY_CTX *pctx = NULL;
 338         int r;
 339         if (!BIO_get_md_ctx(bmd, &mctx)) {
 340             BIO_printf(bio_err, "Error getting context\n");
 341             ERR_print_errors(bio_err);
 342             goto end;
 343         }
 344         if (do_verify)
 345             r = EVP_DigestVerifyInit(mctx, &pctx, md, impl, sigkey);
 346         else
 347             r = EVP_DigestSignInit(mctx, &pctx, md, impl, sigkey);
 348         if (!r) {
 349             BIO_printf(bio_err, "Error setting context\n");
 350             ERR_print_errors(bio_err);
 351             goto end;
 352         }
 353         if (sigopts != NULL) {
 354             char *sigopt;
 355             for (i = 0; i < sk_OPENSSL_STRING_num(sigopts); i++) {
 356                 sigopt = sk_OPENSSL_STRING_value(sigopts, i);
 357                 if (pkey_ctrl_string(pctx, sigopt) <= 0) {
 358                     BIO_printf(bio_err, "parameter error \"%s\"\n", sigopt);
 359                     ERR_print_errors(bio_err);
 360                     goto end;
 361                 }
 362             }
 363         }
 364     }
 365     /* we use md as a filter, reading from 'in' */
 366     else {
 367         EVP_MD_CTX *mctx = NULL;
 368         if (!BIO_get_md_ctx(bmd, &mctx)) {
 369             BIO_printf(bio_err, "Error getting context\n");
 370             ERR_print_errors(bio_err);
 371             goto end;
 372         }
 373         if (md == NULL)
 374             md = EVP_sha256();
 375         if (!EVP_DigestInit_ex(mctx, md, impl)) {
 376             BIO_printf(bio_err, "Error setting digest\n");
 377             ERR_print_errors(bio_err);
 378             goto end;
 379         }
 380     }
 381
 382     if (sigfile != NULL && sigkey != NULL) {
 383         BIO *sigbio = BIO_new_file(sigfile, "rb");
 384         if (sigbio == NULL) {
 385             BIO_printf(bio_err, "Error opening signature file %s\n", sigfile);
 386             ERR_print_errors(bio_err);
 387             goto end;
 388         }
 389         siglen = EVP_PKEY_size(sigkey);
 390         sigbuf = app_malloc(siglen, "signature buffer");
 391         siglen = BIO_read(sigbio, sigbuf, siglen);
 392         BIO_free(sigbio);
 393         if (siglen <= 0) {
 394             BIO_printf(bio_err, "Error reading signature file %s\n", sigfile);
 395             ERR_print_errors(bio_err);
 396             goto end;
 397         }
 398     }
 399     inp = BIO_push(bmd, in);
 400
 401     if (md == NULL) {
 402         EVP_MD_CTX *tctx;
 403         BIO_get_md_ctx(bmd, &tctx);
 404         md = EVP_MD_CTX_md(tctx);
 405     }
 406     if (md != NULL)
 407         md_name = EVP_MD_name(md);
 408
 409     if (xoflen > 0) {
 410         if (!(EVP_MD_flags(md) & EVP_MD_FLAG_XOF)) {
 411             BIO_printf(bio_err, "Length can only be specified for XOF\n");
 412             goto end;
 413         }
 414         if (sigkey != NULL) {
 415             BIO_printf(bio_err, "Signing key cannot be specified for XOF\n");
 416             goto end;
 417         }
 418     }
 419
 420     if (argc == 0) {
 421         BIO_set_fp(in, stdin, BIO_NOCLOSE);
 422         ret = do_fp(out, buf, inp, separator, out_bin, xoflen, sigkey, sigbuf,
 423                     siglen, NULL, md_name, "stdin");
 424     } else {
 425         const char *sig_name = NULL;
 426         if (!out_bin) {
 427             if (sigkey != NULL)
 428                 sig_name = EVP_PKEY_get0_first_alg_name(sigkey);
 429         }
 430         ret = 0;
 431         for (i = 0; i < argc; i++) {
 432             int r;
 433             if (BIO_read_filename(in, argv[i]) <= 0) {
 434                 perror(argv[i]);
 435                 ret++;
 436                 continue;
 437             } else {
 438                 r = do_fp(out, buf, inp, separator, out_bin, xoflen,
 439                           sigkey, sigbuf, siglen, sig_name, md_name, argv[i]);
 440             }
 441             if (r)
 442                 ret = r;
 443             (void)BIO_reset(bmd);
 444         }
 445     }
 446  end:
 447     OPENSSL_clear_free(buf, BUFSIZE);
 448     BIO_free(in);
 449     OPENSSL_free(passin);
 450     BIO_free_all(out);
 451     EVP_PKEY_free(sigkey);
 452     sk_OPENSSL_STRING_free(sigopts);
 453     sk_OPENSSL_STRING_free(macopts);
 454     OPENSSL_free(sigbuf);
 455     BIO_free(bmd);
 456     release_engine(e);
 457     return ret;
 458 }
 459
 460 static void show_digests(const OBJ_NAME *name, void *arg)
 461 {
 462     struct doall_dgst_digests *dec = (struct doall_dgst_digests *)arg;
 463     const EVP_MD *md = NULL;
 464
 465     /* Filter out signed digests (a.k.a signature algorithms) */
 466     if (strstr(name->name, "rsa") != NULL || strstr(name->name, "RSA") != NULL)
 467         return;
 468
 469     if (!islower((unsigned char)*name->name))
 470         return;
 471
 472     /* Filter out message digests that we cannot use */
 473     md = EVP_get_digestbyname(name->name);
 474     if (md == NULL)
 475         return;
 476
 477     BIO_printf(dec->bio, "-%-25s", name->name);
 478     if (++dec->n == 3) {
 479         BIO_printf(dec->bio, "\n");
 480         dec->n = 0;
 481     } else {
 482         BIO_printf(dec->bio, " ");
 483     }
 484 }
 485
 486 /*
 487  * The newline_escape_filename function performs newline escaping for any
 488  * filename that contains a newline.  This function also takes a pointer
 489  * to backslash. The backslash pointer is a flag to indicating whether a newline
 490  * is present in the filename.  If a newline is present, the backslash flag is
 491  * set and the output format will contain a backslash at the beginning of the
 492  * digest output. This output format is to replicate the output format found
 493  * in the '*sum' checksum programs. This aims to preserve backward
 494  * compatibility.
 495  */
 496 static const char *newline_escape_filename(const char *file, int * backslash)
 497 {
 498     size_t i, e = 0, length = strlen(file), newline_count = 0, mem_len = 0;
 499     char *file_cpy = NULL;
 500
 501     for (i = 0; i < length; i++)
 502         if (file[i] == '\n')
 503             newline_count++;
 504
 505     mem_len = length + newline_count + 1;
 506     file_cpy = app_malloc(mem_len, file);
 507     i = 0;
 508
 509     while(e < length) {
 510         const char c = file[e];
 511         if (c == '\n') {
 512             file_cpy[i++] = '\\';
 513             file_cpy[i++] = 'n';
 514             *backslash = 1;
 515         } else {
 516             file_cpy[i++] = c;
 517         }
 518         e++;
 519     }
 520     file_cpy[i] = '\0';
 521     return (const char*)file_cpy;
 522 }
 523
 524
 525 int do_fp(BIO *out, unsigned char *buf, BIO *bp, int sep, int binout, int xoflen,
 526           EVP_PKEY *key, unsigned char *sigin, int siglen,
 527           const char *sig_name, const char *md_name,
 528           const char *file)
 529 {
 530     size_t len = BUFSIZE;
 531     int i, backslash = 0, ret = 1;
 532     unsigned char *allocated_buf = NULL;
 533
 534     while (BIO_pending(bp) || !BIO_eof(bp)) {
 535         i = BIO_read(bp, (char *)buf, BUFSIZE);
 536         if (i < 0) {
 537             BIO_printf(bio_err, "Read Error in %s\n", file);
 538             ERR_print_errors(bio_err);
 539             goto end;
 540         }
 541         if (i == 0)
 542             break;
 543     }
 544     if (sigin != NULL) {
 545         EVP_MD_CTX *ctx;
 546         BIO_get_md_ctx(bp, &ctx);
 547         i = EVP_DigestVerifyFinal(ctx, sigin, (unsigned int)siglen);
 548         if (i > 0) {
 549             BIO_printf(out, "Verified OK\n");
 550         } else if (i == 0) {
 551             BIO_printf(out, "Verification Failure\n");
 552             goto end;
 553         } else {
 554             BIO_printf(bio_err, "Error Verifying Data\n");
 555             ERR_print_errors(bio_err);
 556             goto end;
 557         }
 558         ret = 0;
 559         goto end;
 560     }
 561     if (key != NULL) {
 562         EVP_MD_CTX *ctx;
 563         size_t tmplen;
 564
 565         BIO_get_md_ctx(bp, &ctx);
 566         if (!EVP_DigestSignFinal(ctx, NULL, &tmplen)) {
 567             BIO_printf(bio_err, "Error Signing Data\n");
 568             ERR_print_errors(bio_err);
 569             goto end;
 570         }
 571         if (tmplen > BUFSIZE) {
 572             len = tmplen;
 573             allocated_buf = app_malloc(len, "Signature buffer");
 574             buf = allocated_buf;
 575         }
 576         if (!EVP_DigestSignFinal(ctx, buf, &len)) {
 577             BIO_printf(bio_err, "Error Signing Data\n");
 578             ERR_print_errors(bio_err);
 579             goto end;
 580         }
 581     } else if (xoflen > 0) {
 582         EVP_MD_CTX *ctx;
 583
 584         len = xoflen;
 585         if (len > BUFSIZE) {
 586             allocated_buf = app_malloc(len, "Digest buffer");
 587             buf = allocated_buf;
 588         }
 589
 590         BIO_get_md_ctx(bp, &ctx);
 591
 592         if (!EVP_DigestFinalXOF(ctx, buf, len)) {
 593             BIO_printf(bio_err, "Error Digesting Data\n");
 594             ERR_print_errors(bio_err);
 595             goto end;
 596         }
 597     } else {
 598         len = BIO_gets(bp, (char *)buf, BUFSIZE);
 599         if ((int)len < 0) {
 600             ERR_print_errors(bio_err);
 601             goto end;
 602         }
 603     }
 604
 605     if (binout) {
 606         BIO_write(out, buf, len);
 607     } else if (sep == 2) {
 608         file = newline_escape_filename(file, &backslash);
 609
 610         if (backslash == 1)
 611             BIO_puts(out, "\\");
 612
 613         for (i = 0; i < (int)len; i++)
 614             BIO_printf(out, "%02x", buf[i]);
 615
 616         BIO_printf(out, " *%s\n", file);
 617         OPENSSL_free((char *)file);
 618     } else {
 619         if (sig_name != NULL) {
 620             BIO_puts(out, sig_name);
 621             if (md_name != NULL)
 622                 BIO_printf(out, "-%s", md_name);
 623             BIO_printf(out, "(%s)= ", file);
 624         } else if (md_name != NULL) {
 625             BIO_printf(out, "%s(%s)= ", md_name, file);
 626         } else {
 627             BIO_printf(out, "(%s)= ", file);
 628         }
 629         for (i = 0; i < (int)len; i++) {
 630             if (sep && (i != 0))
 631                 BIO_printf(out, ":");
 632             BIO_printf(out, "%02x", buf[i]);
 633         }
 634         BIO_printf(out, "\n");
 635     }
 636
 637     ret = 0;
 638  end:
 639     if (allocated_buf != NULL)
 640         OPENSSL_clear_free(allocated_buf, len);
 641
 642     return ret;
 643 }