apps/dgst.c

   1 /*
   2  * Copyright 1995-2020 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     prog = opt_progname(argv[0]);
 115     buf = app_malloc(BUFSIZE, "I/O buffer");
 116     md = EVP_get_digestbyname(prog);
 117
 118     prog = opt_init(argc, argv, dgst_options);
 119     while ((o = opt_next()) != OPT_EOF) {
 120         switch (o) {
 121         case OPT_EOF:
 122         case OPT_ERR:
 123  opthelp:
 124             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 125             goto end;
 126         case OPT_HELP:
 127             opt_help(dgst_options);
 128             ret = 0;
 129             goto end;
 130         case OPT_LIST:
 131             BIO_printf(bio_out, "Supported digests:\n");
 132             dec.bio = bio_out;
 133             dec.n = 0;
 134             OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_MD_METH,
 135                                    show_digests, &dec);
 136             BIO_printf(bio_out, "\n");
 137             ret = 0;
 138             goto end;
 139         case OPT_C:
 140             separator = 1;
 141             break;
 142         case OPT_R:
 143             separator = 2;
 144             break;
 145         case OPT_R_CASES:
 146             if (!opt_rand(o))
 147                 goto end;
 148             break;
 149         case OPT_OUT:
 150             outfile = opt_arg();
 151             break;
 152         case OPT_SIGN:
 153             keyfile = opt_arg();
 154             break;
 155         case OPT_PASSIN:
 156             passinarg = opt_arg();
 157             break;
 158         case OPT_VERIFY:
 159             keyfile = opt_arg();
 160             want_pub = do_verify = 1;
 161             break;
 162         case OPT_PRVERIFY:
 163             keyfile = opt_arg();
 164             do_verify = 1;
 165             break;
 166         case OPT_SIGNATURE:
 167             sigfile = opt_arg();
 168             break;
 169         case OPT_KEYFORM:
 170             if (!opt_format(opt_arg(), OPT_FMT_ANY, &keyform))
 171                 goto opthelp;
 172             break;
 173         case OPT_ENGINE:
 174             e = setup_engine(opt_arg(), 0);
 175             break;
 176         case OPT_ENGINE_IMPL:
 177             engine_impl = 1;
 178             break;
 179         case OPT_HEX:
 180             out_bin = 0;
 181             break;
 182         case OPT_BINARY:
 183             out_bin = 1;
 184             break;
 185         case OPT_XOFLEN:
 186             xoflen = atoi(opt_arg());
 187             break;
 188         case OPT_DEBUG:
 189             debug = 1;
 190             break;
 191         case OPT_FIPS_FINGERPRINT:
 192             hmac_key = "etaonrishdlcupfm";
 193             break;
 194         case OPT_HMAC:
 195             hmac_key = opt_arg();
 196             break;
 197         case OPT_MAC:
 198             mac_name = opt_arg();
 199             break;
 200         case OPT_SIGOPT:
 201             if (!sigopts)
 202                 sigopts = sk_OPENSSL_STRING_new_null();
 203             if (!sigopts || !sk_OPENSSL_STRING_push(sigopts, opt_arg()))
 204                 goto opthelp;
 205             break;
 206         case OPT_MACOPT:
 207             if (!macopts)
 208                 macopts = sk_OPENSSL_STRING_new_null();
 209             if (!macopts || !sk_OPENSSL_STRING_push(macopts, opt_arg()))
 210                 goto opthelp;
 211             break;
 212         case OPT_DIGEST:
 213             if (!opt_md(opt_unknown(), &m))
 214                 goto opthelp;
 215             md = m;
 216             break;
 217         case OPT_PROV_CASES:
 218             if (!opt_provider(o))
 219                 goto end;
 220             break;
 221         }
 222     }
 223     argc = opt_num_rest();
 224     argv = opt_rest();
 225     if (keyfile != NULL && argc > 1) {
 226         BIO_printf(bio_err, "%s: Can only sign or verify one file.\n", prog);
 227         goto end;
 228     }
 229
 230     if (do_verify && sigfile == NULL) {
 231         BIO_printf(bio_err,
 232                    "No signature to verify: use the -signature option\n");
 233         goto end;
 234     }
 235     if (engine_impl)
 236         impl = e;
 237
 238     in = BIO_new(BIO_s_file());
 239     bmd = BIO_new(BIO_f_md());
 240     if ((in == NULL) || (bmd == NULL)) {
 241         ERR_print_errors(bio_err);
 242         goto end;
 243     }
 244
 245     if (debug) {
 246         BIO_set_callback(in, BIO_debug_callback);
 247         /* needed for windows 3.1 */
 248         BIO_set_callback_arg(in, (char *)bio_err);
 249     }
 250
 251     if (!app_passwd(passinarg, NULL, &passin, NULL)) {
 252         BIO_printf(bio_err, "Error getting password\n");
 253         goto end;
 254     }
 255
 256     if (out_bin == -1) {
 257         if (keyfile != NULL)
 258             out_bin = 1;
 259         else
 260             out_bin = 0;
 261     }
 262
 263     out = bio_open_default(outfile, 'w', out_bin ? FORMAT_BINARY : FORMAT_TEXT);
 264     if (out == NULL)
 265         goto end;
 266
 267     if ((!(mac_name == NULL) + !(keyfile == NULL) + !(hmac_key == NULL)) > 1) {
 268         BIO_printf(bio_err, "MAC and Signing key cannot both be specified\n");
 269         goto end;
 270     }
 271
 272     if (keyfile != NULL) {
 273         int type;
 274
 275         if (want_pub)
 276             sigkey = load_pubkey(keyfile, keyform, 0, NULL, e, "public key");
 277         else
 278             sigkey = load_key(keyfile, keyform, 0, passin, e, "private key");
 279         if (sigkey == NULL) {
 280             /*
 281              * load_[pub]key() has already printed an appropriate message
 282              */
 283             goto end;
 284         }
 285         type = EVP_PKEY_id(sigkey);
 286         if (type == EVP_PKEY_ED25519 || type == EVP_PKEY_ED448) {
 287             /*
 288              * We implement PureEdDSA for these which doesn't have a separate
 289              * digest, and only supports one shot.
 290              */
 291             BIO_printf(bio_err, "Key type not supported for this operation\n");
 292             goto end;
 293         }
 294     }
 295
 296     if (mac_name != NULL) {
 297         EVP_PKEY_CTX *mac_ctx = NULL;
 298         int r = 0;
 299         if (!init_gen_str(&mac_ctx, mac_name, impl, 0, NULL, NULL))
 300             goto mac_end;
 301         if (macopts != NULL) {
 302             char *macopt;
 303             for (i = 0; i < sk_OPENSSL_STRING_num(macopts); i++) {
 304                 macopt = sk_OPENSSL_STRING_value(macopts, i);
 305                 if (pkey_ctrl_string(mac_ctx, macopt) <= 0) {
 306                     BIO_printf(bio_err,
 307                                "MAC parameter error \"%s\"\n", macopt);
 308                     ERR_print_errors(bio_err);
 309                     goto mac_end;
 310                 }
 311             }
 312         }
 313         if (EVP_PKEY_keygen(mac_ctx, &sigkey) <= 0) {
 314             BIO_puts(bio_err, "Error generating key\n");
 315             ERR_print_errors(bio_err);
 316             goto mac_end;
 317         }
 318         r = 1;
 319  mac_end:
 320         EVP_PKEY_CTX_free(mac_ctx);
 321         if (r == 0)
 322             goto end;
 323     }
 324
 325     if (hmac_key != NULL) {
 326         sigkey = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, impl,
 327                                               (unsigned char *)hmac_key,
 328                                               strlen(hmac_key));
 329         if (sigkey == NULL)
 330             goto end;
 331     }
 332
 333     if (sigkey != NULL) {
 334         EVP_MD_CTX *mctx = NULL;
 335         EVP_PKEY_CTX *pctx = NULL;
 336         int r;
 337         if (!BIO_get_md_ctx(bmd, &mctx)) {
 338             BIO_printf(bio_err, "Error getting context\n");
 339             ERR_print_errors(bio_err);
 340             goto end;
 341         }
 342         if (do_verify)
 343             r = EVP_DigestVerifyInit(mctx, &pctx, md, impl, sigkey);
 344         else
 345             r = EVP_DigestSignInit(mctx, &pctx, md, impl, sigkey);
 346         if (!r) {
 347             BIO_printf(bio_err, "Error setting context\n");
 348             ERR_print_errors(bio_err);
 349             goto end;
 350         }
 351         if (sigopts != NULL) {
 352             char *sigopt;
 353             for (i = 0; i < sk_OPENSSL_STRING_num(sigopts); i++) {
 354                 sigopt = sk_OPENSSL_STRING_value(sigopts, i);
 355                 if (pkey_ctrl_string(pctx, sigopt) <= 0) {
 356                     BIO_printf(bio_err, "parameter error \"%s\"\n", sigopt);
 357                     ERR_print_errors(bio_err);
 358                     goto end;
 359                 }
 360             }
 361         }
 362     }
 363     /* we use md as a filter, reading from 'in' */
 364     else {
 365         EVP_MD_CTX *mctx = NULL;
 366         if (!BIO_get_md_ctx(bmd, &mctx)) {
 367             BIO_printf(bio_err, "Error getting context\n");
 368             ERR_print_errors(bio_err);
 369             goto end;
 370         }
 371         if (md == NULL)
 372             md = EVP_sha256();
 373         if (!EVP_DigestInit_ex(mctx, md, impl)) {
 374             BIO_printf(bio_err, "Error setting digest\n");
 375             ERR_print_errors(bio_err);
 376             goto end;
 377         }
 378     }
 379
 380     if (sigfile != NULL && sigkey != NULL) {
 381         BIO *sigbio = BIO_new_file(sigfile, "rb");
 382         if (sigbio == NULL) {
 383             BIO_printf(bio_err, "Error opening signature file %s\n", sigfile);
 384             ERR_print_errors(bio_err);
 385             goto end;
 386         }
 387         siglen = EVP_PKEY_size(sigkey);
 388         sigbuf = app_malloc(siglen, "signature buffer");
 389         siglen = BIO_read(sigbio, sigbuf, siglen);
 390         BIO_free(sigbio);
 391         if (siglen <= 0) {
 392             BIO_printf(bio_err, "Error reading signature file %s\n", sigfile);
 393             ERR_print_errors(bio_err);
 394             goto end;
 395         }
 396     }
 397     inp = BIO_push(bmd, in);
 398
 399     if (md == NULL) {
 400         EVP_MD_CTX *tctx;
 401         BIO_get_md_ctx(bmd, &tctx);
 402         md = EVP_MD_CTX_md(tctx);
 403     }
 404     if (md != NULL)
 405         md_name = EVP_MD_name(md);
 406
 407     if (xoflen > 0) {
 408         if (!(EVP_MD_flags(md) & EVP_MD_FLAG_XOF)) {
 409             BIO_printf(bio_err, "Length can only be specified for XOF\n");
 410             goto end;
 411         }
 412         if (sigkey != NULL) {
 413             BIO_printf(bio_err, "Signing key cannot be specified for XOF\n");
 414             goto end;
 415         }
 416     }
 417
 418     if (argc == 0) {
 419         BIO_set_fp(in, stdin, BIO_NOCLOSE);
 420         ret = do_fp(out, buf, inp, separator, out_bin, xoflen, sigkey, sigbuf,
 421                     siglen, NULL, md_name, "stdin");
 422     } else {
 423         const char *sig_name = NULL;
 424         if (!out_bin) {
 425             if (sigkey != NULL)
 426                 sig_name = EVP_PKEY_get0_first_alg_name(sigkey);
 427         }
 428         ret = 0;
 429         for (i = 0; i < argc; i++) {
 430             int r;
 431             if (BIO_read_filename(in, argv[i]) <= 0) {
 432                 perror(argv[i]);
 433                 ret++;
 434                 continue;
 435             } else {
 436                 r = do_fp(out, buf, inp, separator, out_bin, xoflen,
 437                           sigkey, sigbuf, siglen, sig_name, md_name, argv[i]);
 438             }
 439             if (r)
 440                 ret = r;
 441             (void)BIO_reset(bmd);
 442         }
 443     }
 444  end:
 445     OPENSSL_clear_free(buf, BUFSIZE);
 446     BIO_free(in);
 447     OPENSSL_free(passin);
 448     BIO_free_all(out);
 449     EVP_PKEY_free(sigkey);
 450     sk_OPENSSL_STRING_free(sigopts);
 451     sk_OPENSSL_STRING_free(macopts);
 452     OPENSSL_free(sigbuf);
 453     BIO_free(bmd);
 454     release_engine(e);
 455     return ret;
 456 }
 457
 458 static void show_digests(const OBJ_NAME *name, void *arg)
 459 {
 460     struct doall_dgst_digests *dec = (struct doall_dgst_digests *)arg;
 461     const EVP_MD *md = NULL;
 462
 463     /* Filter out signed digests (a.k.a signature algorithms) */
 464     if (strstr(name->name, "rsa") != NULL || strstr(name->name, "RSA") != NULL)
 465         return;
 466
 467     if (!islower((unsigned char)*name->name))
 468         return;
 469
 470     /* Filter out message digests that we cannot use */
 471     md = EVP_get_digestbyname(name->name);
 472     if (md == NULL)
 473         return;
 474
 475     BIO_printf(dec->bio, "-%-25s", name->name);
 476     if (++dec->n == 3) {
 477         BIO_printf(dec->bio, "\n");
 478         dec->n = 0;
 479     } else {
 480         BIO_printf(dec->bio, " ");
 481     }
 482 }
 483
 484 /*
 485  * The newline_escape_filename function performs newline escaping for any
 486  * filename that contains a newline.  This function also takes a pointer
 487  * to backslash. The backslash pointer is a flag to indicating whether a newline
 488  * is present in the filename.  If a newline is present, the backslash flag is
 489  * set and the output format will contain a backslash at the beginning of the
 490  * digest output. This output format is to replicate the output format found
 491  * in the '*sum' checksum programs. This aims to preserve backward
 492  * compatibility.
 493  */
 494 static const char *newline_escape_filename(const char *file, int * backslash)
 495 {
 496     size_t i, e = 0, length = strlen(file), newline_count = 0, mem_len = 0;
 497     char *file_cpy = NULL;
 498
 499     for (i = 0; i < length; i++)
 500         if (file[i] == '\n')
 501             newline_count++;
 502
 503     mem_len = length + newline_count + 1;
 504     file_cpy = app_malloc(mem_len, file);
 505     i = 0;
 506
 507     while(e < length) {
 508         const char c = file[e];
 509         if (c == '\n') {
 510             file_cpy[i++] = '\\';
 511             file_cpy[i++] = 'n';
 512             *backslash = 1;
 513         } else {
 514             file_cpy[i++] = c;
 515         }
 516         e++;
 517     }
 518     file_cpy[i] = '\0';
 519     return (const char*)file_cpy;
 520 }
 521
 522
 523 int do_fp(BIO *out, unsigned char *buf, BIO *bp, int sep, int binout, int xoflen,
 524           EVP_PKEY *key, unsigned char *sigin, int siglen,
 525           const char *sig_name, const char *md_name,
 526           const char *file)
 527 {
 528     size_t len = BUFSIZE;
 529     int i, backslash = 0, ret = 1;
 530     unsigned char *allocated_buf = NULL;
 531
 532     while (BIO_pending(bp) || !BIO_eof(bp)) {
 533         i = BIO_read(bp, (char *)buf, BUFSIZE);
 534         if (i < 0) {
 535             BIO_printf(bio_err, "Read Error in %s\n", file);
 536             ERR_print_errors(bio_err);
 537             goto end;
 538         }
 539         if (i == 0)
 540             break;
 541     }
 542     if (sigin != NULL) {
 543         EVP_MD_CTX *ctx;
 544         BIO_get_md_ctx(bp, &ctx);
 545         i = EVP_DigestVerifyFinal(ctx, sigin, (unsigned int)siglen);
 546         if (i > 0) {
 547             BIO_printf(out, "Verified OK\n");
 548         } else if (i == 0) {
 549             BIO_printf(out, "Verification Failure\n");
 550             goto end;
 551         } else {
 552             BIO_printf(bio_err, "Error Verifying Data\n");
 553             ERR_print_errors(bio_err);
 554             goto end;
 555         }
 556         ret = 0;
 557         goto end;
 558     }
 559     if (key != NULL) {
 560         EVP_MD_CTX *ctx;
 561         size_t tmplen;
 562
 563         BIO_get_md_ctx(bp, &ctx);
 564         if (!EVP_DigestSignFinal(ctx, NULL, &tmplen)) {
 565             BIO_printf(bio_err, "Error Signing Data\n");
 566             ERR_print_errors(bio_err);
 567             goto end;
 568         }
 569         if (tmplen > BUFSIZE) {
 570             len = tmplen;
 571             allocated_buf = app_malloc(len, "Signature buffer");
 572             buf = allocated_buf;
 573         }
 574         if (!EVP_DigestSignFinal(ctx, buf, &len)) {
 575             BIO_printf(bio_err, "Error Signing Data\n");
 576             ERR_print_errors(bio_err);
 577             goto end;
 578         }
 579     } else if (xoflen > 0) {
 580         EVP_MD_CTX *ctx;
 581
 582         len = xoflen;
 583         if (len > BUFSIZE) {
 584             allocated_buf = app_malloc(len, "Digest buffer");
 585             buf = allocated_buf;
 586         }
 587
 588         BIO_get_md_ctx(bp, &ctx);
 589
 590         if (!EVP_DigestFinalXOF(ctx, buf, len)) {
 591             BIO_printf(bio_err, "Error Digesting Data\n");
 592             ERR_print_errors(bio_err);
 593             goto end;
 594         }
 595     } else {
 596         len = BIO_gets(bp, (char *)buf, BUFSIZE);
 597         if ((int)len < 0) {
 598             ERR_print_errors(bio_err);
 599             goto end;
 600         }
 601     }
 602
 603     if (binout) {
 604         BIO_write(out, buf, len);
 605     } else if (sep == 2) {
 606         file = newline_escape_filename(file, &backslash);
 607
 608         if (backslash == 1)
 609             BIO_puts(out, "\\");
 610
 611         for (i = 0; i < (int)len; i++)
 612             BIO_printf(out, "%02x", buf[i]);
 613
 614         BIO_printf(out, " *%s\n", file);
 615         OPENSSL_free((char *)file);
 616     } else {
 617         if (sig_name != NULL) {
 618             BIO_puts(out, sig_name);
 619             if (md_name != NULL)
 620                 BIO_printf(out, "-%s", md_name);
 621             BIO_printf(out, "(%s)= ", file);
 622         } else if (md_name != NULL) {
 623             BIO_printf(out, "%s(%s)= ", md_name, file);
 624         } else {
 625             BIO_printf(out, "(%s)= ", file);
 626         }
 627         for (i = 0; i < (int)len; i++) {
 628             if (sep && (i != 0))
 629                 BIO_printf(out, ":");
 630             BIO_printf(out, "%02x", buf[i]);
 631         }
 632         BIO_printf(out, "\n");
 633     }
 634
 635     ret = 0;
 636  end:
 637     if (allocated_buf != NULL)
 638         OPENSSL_clear_free(allocated_buf, len);
 639
 640     return ret;
 641 }