enc.c 20.7 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675
/*
 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "apps.h"
#include "progs.h"
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/rand.h>
#include <openssl/pem.h>
#ifndef OPENSSL_NO_COMP
# include <openssl/comp.h>
#endif
#include <ctype.h>

#undef SIZE
#undef BSIZE
#define SIZE    (512)
#define BSIZE   (8*1024)

static int set_hex(const char *in, unsigned char *out, int size);
static void show_ciphers(const OBJ_NAME *name, void *bio_);

struct doall_enc_ciphers {
    BIO *bio;
    int n;
};

typedef enum OPTION_choice {
    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
    OPT_LIST,
    OPT_E, OPT_IN, OPT_OUT, OPT_PASS, OPT_ENGINE, OPT_D, OPT_P, OPT_V,
    OPT_NOPAD, OPT_SALT, OPT_NOSALT, OPT_DEBUG, OPT_UPPER_P, OPT_UPPER_A,
    OPT_A, OPT_Z, OPT_BUFSIZE, OPT_K, OPT_KFILE, OPT_UPPER_K, OPT_NONE,
    OPT_UPPER_S, OPT_IV, OPT_MD, OPT_ITER, OPT_PBKDF2, OPT_CIPHER,
    OPT_R_ENUM
} OPTION_CHOICE;

const OPTIONS enc_options[] = {
    {"help", OPT_HELP, '-', "Display this summary"},
    {"ciphers", OPT_LIST, '-', "List ciphers"},
    {"in", OPT_IN, '<', "Input file"},
    {"out", OPT_OUT, '>', "Output file"},
    {"pass", OPT_PASS, 's', "Passphrase source"},
    {"e", OPT_E, '-', "Encrypt"},
    {"d", OPT_D, '-', "Decrypt"},
    {"p", OPT_P, '-', "Print the iv/key"},
    {"P", OPT_UPPER_P, '-', "Print the iv/key and exit"},
    {"v", OPT_V, '-', "Verbose output"},
    {"nopad", OPT_NOPAD, '-', "Disable standard block padding"},
    {"salt", OPT_SALT, '-', "Use salt in the KDF (default)"},
    {"nosalt", OPT_NOSALT, '-', "Do not use salt in the KDF"},
    {"debug", OPT_DEBUG, '-', "Print debug info"},
    {"a", OPT_A, '-', "Base64 encode/decode, depending on encryption flag"},
    {"base64", OPT_A, '-', "Same as option -a"},
    {"A", OPT_UPPER_A, '-',
     "Used with -[base64|a] to specify base64 buffer as a single line"},
    {"bufsize", OPT_BUFSIZE, 's', "Buffer size"},
    {"k", OPT_K, 's', "Passphrase"},
    {"kfile", OPT_KFILE, '<', "Read passphrase from file"},
    {"K", OPT_UPPER_K, 's', "Raw key, in hex"},
    {"S", OPT_UPPER_S, 's', "Salt, in hex"},
    {"iv", OPT_IV, 's', "IV in hex"},
    {"md", OPT_MD, 's', "Use specified digest to create a key from the passphrase"},
    {"iter", OPT_ITER, 'p', "Specify the iteration count and force use of PBKDF2"},
    {"pbkdf2", OPT_PBKDF2, '-', "Use password-based key derivation function 2"},
    {"none", OPT_NONE, '-', "Don't encrypt"},
    {"", OPT_CIPHER, '-', "Any supported cipher"},
    OPT_R_OPTIONS,
#ifdef ZLIB
    {"z", OPT_Z, '-', "Use zlib as the 'encryption'"},
#endif
#ifndef OPENSSL_NO_ENGINE
    {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
#endif
    {NULL}
};

int enc_main(int argc, char **argv)
{
    static char buf[128];
    static const char magic[] = "Salted__";
    ENGINE *e = NULL;
    BIO *in = NULL, *out = NULL, *b64 = NULL, *benc = NULL, *rbio =
        NULL, *wbio = NULL;
    EVP_CIPHER_CTX *ctx = NULL;
    const EVP_CIPHER *cipher = NULL, *c;
    const EVP_MD *dgst = NULL;
    char *hkey = NULL, *hiv = NULL, *hsalt = NULL, *p;
    char *infile = NULL, *outfile = NULL, *prog;
    char *str = NULL, *passarg = NULL, *pass = NULL, *strbuf = NULL;
    char mbuf[sizeof(magic) - 1];
    OPTION_CHOICE o;
    int bsize = BSIZE, verbose = 0, debug = 0, olb64 = 0, nosalt = 0;
    int enc = 1, printkey = 0, i, k;
    int base64 = 0, informat = FORMAT_BINARY, outformat = FORMAT_BINARY;
    int ret = 1, inl, nopad = 0;
    unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
    unsigned char *buff = NULL, salt[PKCS5_SALT_LEN];
    int pbkdf2 = 0;
    int iter = 0;
    long n;
    struct doall_enc_ciphers dec;
#ifdef ZLIB
    int do_zlib = 0;
    BIO *bzl = NULL;
#endif

    /* first check the program name */
    prog = opt_progname(argv[0]);
    if (strcmp(prog, "base64") == 0) {
        base64 = 1;
#ifdef ZLIB
    } else if (strcmp(prog, "zlib") == 0) {
        do_zlib = 1;
#endif
    } else {
        cipher = EVP_get_cipherbyname(prog);
        if (cipher == NULL && strcmp(prog, "enc") != 0) {
            BIO_printf(bio_err, "%s is not a known cipher\n", prog);
            goto end;
        }
    }

    prog = opt_init(argc, argv, enc_options);
    while ((o = opt_next()) != OPT_EOF) {
        switch (o) {
        case OPT_EOF:
        case OPT_ERR:
 opthelp:
            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
            goto end;
        case OPT_HELP:
            opt_help(enc_options);
            ret = 0;
            goto end;
        case OPT_LIST:
            BIO_printf(bio_out, "Supported ciphers:\n");
            dec.bio = bio_out;
            dec.n = 0;
            OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH,
                                   show_ciphers, &dec);
            BIO_printf(bio_out, "\n");
            ret = 0;
            goto end;
        case OPT_E:
            enc = 1;
            break;
        case OPT_IN:
            infile = opt_arg();
            break;
        case OPT_OUT:
            outfile = opt_arg();
            break;
        case OPT_PASS:
            passarg = opt_arg();
            break;
        case OPT_ENGINE:
            e = setup_engine(opt_arg(), 0);
            break;
        case OPT_D:
            enc = 0;
            break;
        case OPT_P:
            printkey = 1;
            break;
        case OPT_V:
            verbose = 1;
            break;
        case OPT_NOPAD:
            nopad = 1;
            break;
        case OPT_SALT:
            nosalt = 0;
            break;
        case OPT_NOSALT:
            nosalt = 1;
            break;
        case OPT_DEBUG:
            debug = 1;
            break;
        case OPT_UPPER_P:
            printkey = 2;
            break;
        case OPT_UPPER_A:
            olb64 = 1;
            break;
        case OPT_A:
            base64 = 1;
            break;
        case OPT_Z:
#ifdef ZLIB
            do_zlib = 1;
#endif
            break;
        case OPT_BUFSIZE:
            p = opt_arg();
            i = (int)strlen(p) - 1;
            k = i >= 1 && p[i] == 'k';
            if (k)
                p[i] = '\0';
            if (!opt_long(opt_arg(), &n)
                    || n < 0 || (k && n >= LONG_MAX / 1024))
                goto opthelp;
            if (k)
                n *= 1024;
            bsize = (int)n;
            break;
        case OPT_K:
            str = opt_arg();
            break;
        case OPT_KFILE:
            in = bio_open_default(opt_arg(), 'r', FORMAT_TEXT);
            if (in == NULL)
                goto opthelp;
            i = BIO_gets(in, buf, sizeof(buf));
            BIO_free(in);
            in = NULL;
            if (i <= 0) {
                BIO_printf(bio_err,
                           "%s Can't read key from %s\n", prog, opt_arg());
                goto opthelp;
            }
            while (--i > 0 && (buf[i] == '\r' || buf[i] == '\n'))
                buf[i] = '\0';
            if (i <= 0) {
                BIO_printf(bio_err, "%s: zero length password\n", prog);
                goto opthelp;
            }
            str = buf;
            break;
        case OPT_UPPER_K:
            hkey = opt_arg();
            break;
        case OPT_UPPER_S:
            hsalt = opt_arg();
            break;
        case OPT_IV:
            hiv = opt_arg();
            break;
        case OPT_MD:
            if (!opt_md(opt_arg(), &dgst))
                goto opthelp;
            break;
        case OPT_CIPHER:
            if (!opt_cipher(opt_unknown(), &c))
                goto opthelp;
            cipher = c;
            break;
        case OPT_ITER:
            if (!opt_int(opt_arg(), &iter))
                goto opthelp;
            pbkdf2 = 1;
            break;
        case OPT_PBKDF2:
            pbkdf2 = 1;
            if (iter == 0)    /* do not overwrite a chosen value */
                iter = 10000;
            break;
        case OPT_NONE:
            cipher = NULL;
            break;
        case OPT_R_CASES:
            if (!opt_rand(o))
                goto end;
            break;
        }
    }
    if (opt_num_rest() != 0) {
        BIO_printf(bio_err, "Extra arguments given.\n");
        goto opthelp;
    }

    if (cipher && EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) {
        BIO_printf(bio_err, "%s: AEAD ciphers not supported\n", prog);
        goto end;
    }

    if (cipher && (EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)) {
        BIO_printf(bio_err, "%s XTS ciphers not supported\n", prog);
        goto end;
    }

    if (dgst == NULL)
        dgst = EVP_sha256();

    if (iter == 0)
        iter = 1;

    /* It must be large enough for a base64 encoded line */
    if (base64 && bsize < 80)
        bsize = 80;
    if (verbose)
        BIO_printf(bio_err, "bufsize=%d\n", bsize);

#ifdef ZLIB
    if (!do_zlib)
#endif
        if (base64) {
            if (enc)
                outformat = FORMAT_BASE64;
            else
                informat = FORMAT_BASE64;
        }

    strbuf = app_malloc(SIZE, "strbuf");
    buff = app_malloc(EVP_ENCODE_LENGTH(bsize), "evp buffer");

    if (infile == NULL) {
        in = dup_bio_in(informat);
    } else {
        in = bio_open_default(infile, 'r', informat);
    }
    if (in == NULL)
        goto end;

    if (str == NULL && passarg != NULL) {
        if (!app_passwd(passarg, NULL, &pass, NULL)) {
            BIO_printf(bio_err, "Error getting password\n");
            goto end;
        }
        str = pass;
    }

    if ((str == NULL) && (cipher != NULL) && (hkey == NULL)) {
        if (1) {
#ifndef OPENSSL_NO_UI_CONSOLE
            for (;;) {
                char prompt[200];

                BIO_snprintf(prompt, sizeof(prompt), "enter %s %s password:",
                        OBJ_nid2ln(EVP_CIPHER_nid(cipher)),
                        (enc) ? "encryption" : "decryption");
                strbuf[0] = '\0';
                i = EVP_read_pw_string((char *)strbuf, SIZE, prompt, enc);
                if (i == 0) {
                    if (strbuf[0] == '\0') {
                        ret = 1;
                        goto end;
                    }
                    str = strbuf;
                    break;
                }
                if (i < 0) {
                    BIO_printf(bio_err, "bad password read\n");
                    goto end;
                }
            }
        } else {
#endif
            BIO_printf(bio_err, "password required\n");
            goto end;
        }
    }

    out = bio_open_default(outfile, 'w', outformat);
    if (out == NULL)
        goto end;

    if (debug) {
        BIO_set_callback(in, BIO_debug_callback);
        BIO_set_callback(out, BIO_debug_callback);
        BIO_set_callback_arg(in, (char *)bio_err);
        BIO_set_callback_arg(out, (char *)bio_err);
    }

    rbio = in;
    wbio = out;

#ifdef ZLIB
    if (do_zlib) {
        if ((bzl = BIO_new(BIO_f_zlib())) == NULL)
            goto end;
        if (debug) {
            BIO_set_callback(bzl, BIO_debug_callback);
            BIO_set_callback_arg(bzl, (char *)bio_err);
        }
        if (enc)
            wbio = BIO_push(bzl, wbio);
        else
            rbio = BIO_push(bzl, rbio);
    }
#endif

    if (base64) {
        if ((b64 = BIO_new(BIO_f_base64())) == NULL)
            goto end;
        if (debug) {
            BIO_set_callback(b64, BIO_debug_callback);
            BIO_set_callback_arg(b64, (char *)bio_err);
        }
        if (olb64)
            BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
        if (enc)
            wbio = BIO_push(b64, wbio);
        else
            rbio = BIO_push(b64, rbio);
    }

    if (cipher != NULL) {
        /*
         * Note that str is NULL if a key was passed on the command line, so
         * we get no salt in that case. Is this a bug?
         */
        if (str != NULL) {
            /*
             * Salt handling: if encrypting generate a salt and write to
             * output BIO. If decrypting read salt from input BIO.
             */
            unsigned char *sptr;
            size_t str_len = strlen(str);

            if (nosalt) {
                sptr = NULL;
            } else {
                if (enc) {
                    if (hsalt) {
                        if (!set_hex(hsalt, salt, sizeof(salt))) {
                            BIO_printf(bio_err, "invalid hex salt value\n");
                            goto end;
                        }
                    } else if (RAND_bytes(salt, sizeof(salt)) <= 0) {
                        goto end;
                    }
                    /*
                     * If -P option then don't bother writing
                     */
                    if ((printkey != 2)
                        && (BIO_write(wbio, magic,
                                      sizeof(magic) - 1) != sizeof(magic) - 1
                            || BIO_write(wbio,
                                         (char *)salt,
                                         sizeof(salt)) != sizeof(salt))) {
                        BIO_printf(bio_err, "error writing output file\n");
                        goto end;
                    }
                } else if (BIO_read(rbio, mbuf, sizeof(mbuf)) != sizeof(mbuf)
                           || BIO_read(rbio,
                                       (unsigned char *)salt,
                                       sizeof(salt)) != sizeof(salt)) {
                    BIO_printf(bio_err, "error reading input file\n");
                    goto end;
                } else if (memcmp(mbuf, magic, sizeof(magic) - 1)) {
                    BIO_printf(bio_err, "bad magic number\n");
                    goto end;
                }
                sptr = salt;
            }

            if (pbkdf2 == 1) {
                /*
                * derive key and default iv
                * concatenated into a temporary buffer
                */
                unsigned char tmpkeyiv[EVP_MAX_KEY_LENGTH + EVP_MAX_IV_LENGTH];
                int iklen = EVP_CIPHER_key_length(cipher);
                int ivlen = EVP_CIPHER_iv_length(cipher);
                /* not needed if HASH_UPDATE() is fixed : */
                int islen = (sptr != NULL ? sizeof(salt) : 0);
                if (!PKCS5_PBKDF2_HMAC(str, str_len, sptr, islen,
                                       iter, dgst, iklen+ivlen, tmpkeyiv)) {
                    BIO_printf(bio_err, "PKCS5_PBKDF2_HMAC failed\n");
                    goto end;
                }
                /* split and move data back to global buffer */
                memcpy(key, tmpkeyiv, iklen);
                memcpy(iv, tmpkeyiv+iklen, ivlen);
            } else {
                BIO_printf(bio_err, "*** WARNING : "
                                    "deprecated key derivation used.\n"
                                    "Using -iter or -pbkdf2 would be better.\n");
                if (!EVP_BytesToKey(cipher, dgst, sptr,
                                    (unsigned char *)str, str_len,
                                    1, key, iv)) {
                    BIO_printf(bio_err, "EVP_BytesToKey failed\n");
                    goto end;
                }
            }
            /*
             * zero the complete buffer or the string passed from the command
             * line.
             */
            if (str == strbuf)
                OPENSSL_cleanse(str, SIZE);
            else
                OPENSSL_cleanse(str, str_len);
        }
        if (hiv != NULL) {
            int siz = EVP_CIPHER_iv_length(cipher);
            if (siz == 0) {
                BIO_printf(bio_err, "warning: iv not use by this cipher\n");
            } else if (!set_hex(hiv, iv, siz)) {
                BIO_printf(bio_err, "invalid hex iv value\n");
                goto end;
            }
        }
        if ((hiv == NULL) && (str == NULL)
            && EVP_CIPHER_iv_length(cipher) != 0) {
            /*
             * No IV was explicitly set and no IV was generated.
             * Hence the IV is undefined, making correct decryption impossible.
             */
            BIO_printf(bio_err, "iv undefined\n");
            goto end;
        }
        if (hkey != NULL) {
            if (!set_hex(hkey, key, EVP_CIPHER_key_length(cipher))) {
                BIO_printf(bio_err, "invalid hex key value\n");
                goto end;
            }
            /* wiping secret data as we no longer need it */
            OPENSSL_cleanse(hkey, strlen(hkey));
        }

        if ((benc = BIO_new(BIO_f_cipher())) == NULL)
            goto end;

        /*
         * Since we may be changing parameters work on the encryption context
         * rather than calling BIO_set_cipher().
         */

        BIO_get_cipher_ctx(benc, &ctx);

        if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc)) {
            BIO_printf(bio_err, "Error setting cipher %s\n",
                       EVP_CIPHER_name(cipher));
            ERR_print_errors(bio_err);
            goto end;
        }

        if (nopad)
            EVP_CIPHER_CTX_set_padding(ctx, 0);

        if (!EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, enc)) {
            BIO_printf(bio_err, "Error setting cipher %s\n",
                       EVP_CIPHER_name(cipher));
            ERR_print_errors(bio_err);
            goto end;
        }

        if (debug) {
            BIO_set_callback(benc, BIO_debug_callback);
            BIO_set_callback_arg(benc, (char *)bio_err);
        }

        if (printkey) {
            if (!nosalt) {
                printf("salt=");
                for (i = 0; i < (int)sizeof(salt); i++)
                    printf("%02X", salt[i]);
                printf("\n");
            }
            if (EVP_CIPHER_key_length(cipher) > 0) {
                printf("key=");
                for (i = 0; i < EVP_CIPHER_key_length(cipher); i++)
                    printf("%02X", key[i]);
                printf("\n");
            }
            if (EVP_CIPHER_iv_length(cipher) > 0) {
                printf("iv =");
                for (i = 0; i < EVP_CIPHER_iv_length(cipher); i++)
                    printf("%02X", iv[i]);
                printf("\n");
            }
            if (printkey == 2) {
                ret = 0;
                goto end;
            }
        }
    }

    /* Only encrypt/decrypt as we write the file */
    if (benc != NULL)
        wbio = BIO_push(benc, wbio);

    for (;;) {
        inl = BIO_read(rbio, (char *)buff, bsize);
        if (inl <= 0)
            break;
        if (BIO_write(wbio, (char *)buff, inl) != inl) {
            BIO_printf(bio_err, "error writing output file\n");
            goto end;
        }
    }
    if (!BIO_flush(wbio)) {
        BIO_printf(bio_err, "bad decrypt\n");
        goto end;
    }

    ret = 0;
    if (verbose) {
        BIO_printf(bio_err, "bytes read   : %8ju\n", BIO_number_read(in));
        BIO_printf(bio_err, "bytes written: %8ju\n", BIO_number_written(out));
    }
 end:
    ERR_print_errors(bio_err);
    OPENSSL_free(strbuf);
    OPENSSL_free(buff);
    BIO_free(in);
    BIO_free_all(out);
    BIO_free(benc);
    BIO_free(b64);
#ifdef ZLIB
    BIO_free(bzl);
#endif
    release_engine(e);
    OPENSSL_free(pass);
    return ret;
}

static void show_ciphers(const OBJ_NAME *name, void *arg)
{
    struct doall_enc_ciphers *dec = (struct doall_enc_ciphers *)arg;
    const EVP_CIPHER *cipher;

    if (!islower((unsigned char)*name->name))
        return;

    /* Filter out ciphers that we cannot use */
    cipher = EVP_get_cipherbyname(name->name);
    if (cipher == NULL ||
            (EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) != 0 ||
            EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)
        return;

    BIO_printf(dec->bio, "-%-25s", name->name);
    if (++dec->n == 3) {
        BIO_printf(dec->bio, "\n");
        dec->n = 0;
    } else
        BIO_printf(dec->bio, " ");
}

static int set_hex(const char *in, unsigned char *out, int size)
{
    int i, n;
    unsigned char j;

    i = size * 2;
    n = strlen(in);
    if (n > i) {
        BIO_printf(bio_err, "hex string is too long, ignoring excess\n");
        n = i; /* ignore exceeding part */
    } else if (n < i) {
        BIO_printf(bio_err, "hex string is too short, padding with zero bytes to length\n");
    }

    memset(out, 0, size);
    for (i = 0; i < n; i++) {
        j = (unsigned char)*in++;
        if (!isxdigit(j)) {
            BIO_printf(bio_err, "non-hex digit\n");
            return 0;
        }
        j = (unsigned char)OPENSSL_hexchar2int(j);
        if (i & 1)
            out[i / 2] |= j;
        else
            out[i / 2] = (j << 4);
    }
    return 1;
}