1 /* 2 * Copyright 1995-2023 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 <stdlib.h> 12 #include <string.h> 13 #include <limits.h> 14 #include "apps.h" 15 #include "progs.h" 16 #include <openssl/bio.h> 17 #include <openssl/err.h> 18 #include <openssl/evp.h> 19 #include <openssl/objects.h> 20 #include <openssl/x509.h> 21 #include <openssl/rand.h> 22 #include <openssl/pem.h> 23 #ifndef OPENSSL_NO_COMP 24 # include <openssl/comp.h> 25 #endif 26 #include <ctype.h> 27 28 #undef SIZE 29 #undef BSIZE 30 #define SIZE (512) 31 #define BSIZE (8*1024) 32 33 #define PBKDF2_ITER_DEFAULT 10000 34 #define STR(a) XSTR(a) 35 #define XSTR(a) #a 36 37 static int set_hex(const char *in, unsigned char *out, int size); 38 static void show_ciphers(const OBJ_NAME *name, void *bio_); 39 40 struct doall_enc_ciphers { 41 BIO *bio; 42 int n; 43 }; 44 45 typedef enum OPTION_choice { 46 OPT_COMMON, 47 OPT_LIST, 48 OPT_E, OPT_IN, OPT_OUT, OPT_PASS, OPT_ENGINE, OPT_D, OPT_P, OPT_V, 49 OPT_NOPAD, OPT_SALT, OPT_NOSALT, OPT_DEBUG, OPT_UPPER_P, OPT_UPPER_A, 50 OPT_A, OPT_Z, OPT_BUFSIZE, OPT_K, OPT_KFILE, OPT_UPPER_K, OPT_NONE, 51 OPT_UPPER_S, OPT_IV, OPT_MD, OPT_ITER, OPT_PBKDF2, OPT_CIPHER, 52 OPT_R_ENUM, OPT_PROV_ENUM 53 } OPTION_CHOICE; 54 55 const OPTIONS enc_options[] = { 56 OPT_SECTION("General"), 57 {"help", OPT_HELP, '-', "Display this summary"}, 58 {"list", OPT_LIST, '-', "List ciphers"}, 59 #ifndef OPENSSL_NO_DEPRECATED_3_0 60 {"ciphers", OPT_LIST, '-', "Alias for -list"}, 61 #endif 62 {"e", OPT_E, '-', "Encrypt"}, 63 {"d", OPT_D, '-', "Decrypt"}, 64 {"p", OPT_P, '-', "Print the iv/key"}, 65 {"P", OPT_UPPER_P, '-', "Print the iv/key and exit"}, 66 #ifndef OPENSSL_NO_ENGINE 67 {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"}, 68 #endif 69 70 OPT_SECTION("Input"), 71 {"in", OPT_IN, '<', "Input file"}, 72 {"k", OPT_K, 's', "Passphrase"}, 73 {"kfile", OPT_KFILE, '<', "Read passphrase from file"}, 74 75 OPT_SECTION("Output"), 76 {"out", OPT_OUT, '>', "Output file"}, 77 {"pass", OPT_PASS, 's', "Passphrase source"}, 78 {"v", OPT_V, '-', "Verbose output"}, 79 {"a", OPT_A, '-', "Base64 encode/decode, depending on encryption flag"}, 80 {"base64", OPT_A, '-', "Same as option -a"}, 81 {"A", OPT_UPPER_A, '-', 82 "Used with -[base64|a] to specify base64 buffer as a single line"}, 83 84 OPT_SECTION("Encryption"), 85 {"nopad", OPT_NOPAD, '-', "Disable standard block padding"}, 86 {"salt", OPT_SALT, '-', "Use salt in the KDF (default)"}, 87 {"nosalt", OPT_NOSALT, '-', "Do not use salt in the KDF"}, 88 {"debug", OPT_DEBUG, '-', "Print debug info"}, 89 90 {"bufsize", OPT_BUFSIZE, 's', "Buffer size"}, 91 {"K", OPT_UPPER_K, 's', "Raw key, in hex"}, 92 {"S", OPT_UPPER_S, 's', "Salt, in hex"}, 93 {"iv", OPT_IV, 's', "IV in hex"}, 94 {"md", OPT_MD, 's', "Use specified digest to create a key from the passphrase"}, 95 {"iter", OPT_ITER, 'p', 96 "Specify the iteration count and force the use of PBKDF2"}, 97 {OPT_MORE_STR, 0, 0, "Default: " STR(PBKDF2_ITER_DEFAULT)}, 98 {"pbkdf2", OPT_PBKDF2, '-', 99 "Use password-based key derivation function 2 (PBKDF2)"}, 100 {OPT_MORE_STR, 0, 0, 101 "Use -iter to change the iteration count from " STR(PBKDF2_ITER_DEFAULT)}, 102 {"none", OPT_NONE, '-', "Don't encrypt"}, 103 #ifdef ZLIB 104 {"z", OPT_Z, '-', "Compress or decompress encrypted data using zlib"}, 105 #endif 106 {"", OPT_CIPHER, '-', "Any supported cipher"}, 107 108 OPT_R_OPTIONS, 109 OPT_PROV_OPTIONS, 110 {NULL} 111 }; 112 113 int enc_main(int argc, char **argv) 114 { 115 static char buf[128]; 116 static const char magic[] = "Salted__"; 117 ENGINE *e = NULL; 118 BIO *in = NULL, *out = NULL, *b64 = NULL, *benc = NULL, *rbio = 119 NULL, *wbio = NULL; 120 EVP_CIPHER_CTX *ctx = NULL; 121 EVP_CIPHER *cipher = NULL; 122 EVP_MD *dgst = NULL; 123 const char *digestname = NULL; 124 char *hkey = NULL, *hiv = NULL, *hsalt = NULL, *p; 125 char *infile = NULL, *outfile = NULL, *prog; 126 char *str = NULL, *passarg = NULL, *pass = NULL, *strbuf = NULL; 127 const char *ciphername = NULL; 128 char mbuf[sizeof(magic) - 1]; 129 OPTION_CHOICE o; 130 int bsize = BSIZE, verbose = 0, debug = 0, olb64 = 0, nosalt = 0; 131 int enc = 1, printkey = 0, i, k; 132 int base64 = 0, informat = FORMAT_BINARY, outformat = FORMAT_BINARY; 133 int ret = 1, inl, nopad = 0; 134 unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH]; 135 unsigned char *buff = NULL, salt[PKCS5_SALT_LEN]; 136 int pbkdf2 = 0; 137 int iter = 0; 138 long n; 139 struct doall_enc_ciphers dec; 140 #ifdef ZLIB 141 int do_zlib = 0; 142 BIO *bzl = NULL; 143 #endif 144 145 /* first check the command name */ 146 if (strcmp(argv[0], "base64") == 0) 147 base64 = 1; 148 #ifdef ZLIB 149 else if (strcmp(argv[0], "zlib") == 0) 150 do_zlib = 1; 151 #endif 152 else if (strcmp(argv[0], "enc") != 0) 153 ciphername = argv[0]; 154 155 prog = opt_init(argc, argv, enc_options); 156 while ((o = opt_next()) != OPT_EOF) { 157 switch (o) { 158 case OPT_EOF: 159 case OPT_ERR: 160 opthelp: 161 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog); 162 goto end; 163 case OPT_HELP: 164 opt_help(enc_options); 165 ret = 0; 166 goto end; 167 case OPT_LIST: 168 BIO_printf(bio_out, "Supported ciphers:\n"); 169 dec.bio = bio_out; 170 dec.n = 0; 171 OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH, 172 show_ciphers, &dec); 173 BIO_printf(bio_out, "\n"); 174 ret = 0; 175 goto end; 176 case OPT_E: 177 enc = 1; 178 break; 179 case OPT_IN: 180 infile = opt_arg(); 181 break; 182 case OPT_OUT: 183 outfile = opt_arg(); 184 break; 185 case OPT_PASS: 186 passarg = opt_arg(); 187 break; 188 case OPT_ENGINE: 189 e = setup_engine(opt_arg(), 0); 190 break; 191 case OPT_D: 192 enc = 0; 193 break; 194 case OPT_P: 195 printkey = 1; 196 break; 197 case OPT_V: 198 verbose = 1; 199 break; 200 case OPT_NOPAD: 201 nopad = 1; 202 break; 203 case OPT_SALT: 204 nosalt = 0; 205 break; 206 case OPT_NOSALT: 207 nosalt = 1; 208 break; 209 case OPT_DEBUG: 210 debug = 1; 211 break; 212 case OPT_UPPER_P: 213 printkey = 2; 214 break; 215 case OPT_UPPER_A: 216 olb64 = 1; 217 break; 218 case OPT_A: 219 base64 = 1; 220 break; 221 case OPT_Z: 222 #ifdef ZLIB 223 do_zlib = 1; 224 #endif 225 break; 226 case OPT_BUFSIZE: 227 p = opt_arg(); 228 i = (int)strlen(p) - 1; 229 k = i >= 1 && p[i] == 'k'; 230 if (k) 231 p[i] = '\0'; 232 if (!opt_long(opt_arg(), &n) 233 || n < 0 || (k && n >= LONG_MAX / 1024)) 234 goto opthelp; 235 if (k) 236 n *= 1024; 237 bsize = (int)n; 238 break; 239 case OPT_K: 240 str = opt_arg(); 241 break; 242 case OPT_KFILE: 243 in = bio_open_default(opt_arg(), 'r', FORMAT_TEXT); 244 if (in == NULL) 245 goto opthelp; 246 i = BIO_gets(in, buf, sizeof(buf)); 247 BIO_free(in); 248 in = NULL; 249 if (i <= 0) { 250 BIO_printf(bio_err, 251 "%s Can't read key from %s\n", prog, opt_arg()); 252 goto opthelp; 253 } 254 while (--i > 0 && (buf[i] == '\r' || buf[i] == '\n')) 255 buf[i] = '\0'; 256 if (i <= 0) { 257 BIO_printf(bio_err, "%s: zero length password\n", prog); 258 goto opthelp; 259 } 260 str = buf; 261 break; 262 case OPT_UPPER_K: 263 hkey = opt_arg(); 264 break; 265 case OPT_UPPER_S: 266 hsalt = opt_arg(); 267 break; 268 case OPT_IV: 269 hiv = opt_arg(); 270 break; 271 case OPT_MD: 272 digestname = opt_arg(); 273 break; 274 case OPT_CIPHER: 275 ciphername = opt_unknown(); 276 break; 277 case OPT_ITER: 278 iter = opt_int_arg(); 279 pbkdf2 = 1; 280 break; 281 case OPT_PBKDF2: 282 pbkdf2 = 1; 283 if (iter == 0) /* do not overwrite a chosen value */ 284 iter = PBKDF2_ITER_DEFAULT; 285 break; 286 case OPT_NONE: 287 cipher = NULL; 288 break; 289 case OPT_R_CASES: 290 if (!opt_rand(o)) 291 goto end; 292 break; 293 case OPT_PROV_CASES: 294 if (!opt_provider(o)) 295 goto end; 296 break; 297 } 298 } 299 300 /* No extra arguments. */ 301 argc = opt_num_rest(); 302 if (argc != 0) 303 goto opthelp; 304 if (!app_RAND_load()) 305 goto end; 306 307 /* Get the cipher name, either from progname (if set) or flag. */ 308 if (ciphername != NULL) { 309 if (!opt_cipher(ciphername, &cipher)) 310 goto opthelp; 311 } 312 if (digestname != NULL) { 313 if (!opt_md(digestname, &dgst)) 314 goto opthelp; 315 } 316 if (dgst == NULL) 317 dgst = (EVP_MD *)EVP_sha256(); 318 319 if (iter == 0) 320 iter = 1; 321 322 /* It must be large enough for a base64 encoded line */ 323 if (base64 && bsize < 80) 324 bsize = 80; 325 if (verbose) 326 BIO_printf(bio_err, "bufsize=%d\n", bsize); 327 328 #ifdef ZLIB 329 if (!do_zlib) 330 #endif 331 if (base64) { 332 if (enc) 333 outformat = FORMAT_BASE64; 334 else 335 informat = FORMAT_BASE64; 336 } 337 338 strbuf = app_malloc(SIZE, "strbuf"); 339 buff = app_malloc(EVP_ENCODE_LENGTH(bsize), "evp buffer"); 340 341 if (infile == NULL) { 342 in = dup_bio_in(informat); 343 } else { 344 in = bio_open_default(infile, 'r', informat); 345 } 346 if (in == NULL) 347 goto end; 348 349 if (str == NULL && passarg != NULL) { 350 if (!app_passwd(passarg, NULL, &pass, NULL)) { 351 BIO_printf(bio_err, "Error getting password\n"); 352 goto end; 353 } 354 str = pass; 355 } 356 357 if ((str == NULL) && (cipher != NULL) && (hkey == NULL)) { 358 if (1) { 359 #ifndef OPENSSL_NO_UI_CONSOLE 360 for (;;) { 361 char prompt[200]; 362 363 BIO_snprintf(prompt, sizeof(prompt), "enter %s %s password:", 364 EVP_CIPHER_get0_name(cipher), 365 (enc) ? "encryption" : "decryption"); 366 strbuf[0] = '\0'; 367 i = EVP_read_pw_string((char *)strbuf, SIZE, prompt, enc); 368 if (i == 0) { 369 if (strbuf[0] == '\0') { 370 ret = 1; 371 goto end; 372 } 373 str = strbuf; 374 break; 375 } 376 if (i < 0) { 377 BIO_printf(bio_err, "bad password read\n"); 378 goto end; 379 } 380 } 381 } else { 382 #endif 383 BIO_printf(bio_err, "password required\n"); 384 goto end; 385 } 386 } 387 388 out = bio_open_default(outfile, 'w', outformat); 389 if (out == NULL) 390 goto end; 391 392 if (debug) { 393 BIO_set_callback_ex(in, BIO_debug_callback_ex); 394 BIO_set_callback_ex(out, BIO_debug_callback_ex); 395 BIO_set_callback_arg(in, (char *)bio_err); 396 BIO_set_callback_arg(out, (char *)bio_err); 397 } 398 399 rbio = in; 400 wbio = out; 401 402 #ifdef ZLIB 403 if (do_zlib) { 404 if ((bzl = BIO_new(BIO_f_zlib())) == NULL) 405 goto end; 406 if (debug) { 407 BIO_set_callback_ex(bzl, BIO_debug_callback_ex); 408 BIO_set_callback_arg(bzl, (char *)bio_err); 409 } 410 if (enc) 411 wbio = BIO_push(bzl, wbio); 412 else 413 rbio = BIO_push(bzl, rbio); 414 } 415 #endif 416 417 if (base64) { 418 if ((b64 = BIO_new(BIO_f_base64())) == NULL) 419 goto end; 420 if (debug) { 421 BIO_set_callback_ex(b64, BIO_debug_callback_ex); 422 BIO_set_callback_arg(b64, (char *)bio_err); 423 } 424 if (olb64) 425 BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL); 426 if (enc) 427 wbio = BIO_push(b64, wbio); 428 else 429 rbio = BIO_push(b64, rbio); 430 } 431 432 if (cipher != NULL) { 433 if (str != NULL) { /* a passphrase is available */ 434 /* 435 * Salt handling: if encrypting generate a salt if not supplied, 436 * and write to output BIO. If decrypting use salt from input BIO 437 * if not given with args 438 */ 439 unsigned char *sptr; 440 size_t str_len = strlen(str); 441 442 if (nosalt) { 443 sptr = NULL; 444 } else { 445 if (hsalt != NULL && !set_hex(hsalt, salt, sizeof(salt))) { 446 BIO_printf(bio_err, "invalid hex salt value\n"); 447 goto end; 448 } 449 if (enc) { /* encryption */ 450 if (hsalt == NULL) { 451 if (RAND_bytes(salt, sizeof(salt)) <= 0) { 452 BIO_printf(bio_err, "RAND_bytes failed\n"); 453 goto end; 454 } 455 /* 456 * If -P option then don't bother writing. 457 * If salt is given, shouldn't either ? 458 */ 459 if ((printkey != 2) 460 && (BIO_write(wbio, magic, 461 sizeof(magic) - 1) != sizeof(magic) - 1 462 || BIO_write(wbio, 463 (char *)salt, 464 sizeof(salt)) != sizeof(salt))) { 465 BIO_printf(bio_err, "error writing output file\n"); 466 goto end; 467 } 468 } 469 } else { /* decryption */ 470 if (hsalt == NULL) { 471 if (BIO_read(rbio, mbuf, sizeof(mbuf)) != sizeof(mbuf)) { 472 BIO_printf(bio_err, "error reading input file\n"); 473 goto end; 474 } 475 if (memcmp(mbuf, magic, sizeof(mbuf)) == 0) { /* file IS salted */ 476 if (BIO_read(rbio, salt, 477 sizeof(salt)) != sizeof(salt)) { 478 BIO_printf(bio_err, "error reading input file\n"); 479 goto end; 480 } 481 } else { /* file is NOT salted, NO salt available */ 482 BIO_printf(bio_err, "bad magic number\n"); 483 goto end; 484 } 485 } 486 } 487 sptr = salt; 488 } 489 490 if (pbkdf2 == 1) { 491 /* 492 * derive key and default iv 493 * concatenated into a temporary buffer 494 */ 495 unsigned char tmpkeyiv[EVP_MAX_KEY_LENGTH + EVP_MAX_IV_LENGTH]; 496 int iklen = EVP_CIPHER_get_key_length(cipher); 497 int ivlen = EVP_CIPHER_get_iv_length(cipher); 498 /* not needed if HASH_UPDATE() is fixed : */ 499 int islen = (sptr != NULL ? sizeof(salt) : 0); 500 if (!PKCS5_PBKDF2_HMAC(str, str_len, sptr, islen, 501 iter, dgst, iklen+ivlen, tmpkeyiv)) { 502 BIO_printf(bio_err, "PKCS5_PBKDF2_HMAC failed\n"); 503 goto end; 504 } 505 /* split and move data back to global buffer */ 506 memcpy(key, tmpkeyiv, iklen); 507 memcpy(iv, tmpkeyiv+iklen, ivlen); 508 } else { 509 BIO_printf(bio_err, "*** WARNING : " 510 "deprecated key derivation used.\n" 511 "Using -iter or -pbkdf2 would be better.\n"); 512 if (!EVP_BytesToKey(cipher, dgst, sptr, 513 (unsigned char *)str, str_len, 514 1, key, iv)) { 515 BIO_printf(bio_err, "EVP_BytesToKey failed\n"); 516 goto end; 517 } 518 } 519 /* 520 * zero the complete buffer or the string passed from the command 521 * line. 522 */ 523 if (str == strbuf) 524 OPENSSL_cleanse(str, SIZE); 525 else 526 OPENSSL_cleanse(str, str_len); 527 } 528 if (hiv != NULL) { 529 int siz = EVP_CIPHER_get_iv_length(cipher); 530 if (siz == 0) { 531 BIO_printf(bio_err, "warning: iv not used by this cipher\n"); 532 } else if (!set_hex(hiv, iv, siz)) { 533 BIO_printf(bio_err, "invalid hex iv value\n"); 534 goto end; 535 } 536 } 537 if ((hiv == NULL) && (str == NULL) 538 && EVP_CIPHER_get_iv_length(cipher) != 0) { 539 /* 540 * No IV was explicitly set and no IV was generated. 541 * Hence the IV is undefined, making correct decryption impossible. 542 */ 543 BIO_printf(bio_err, "iv undefined\n"); 544 goto end; 545 } 546 if (hkey != NULL) { 547 if (!set_hex(hkey, key, EVP_CIPHER_get_key_length(cipher))) { 548 BIO_printf(bio_err, "invalid hex key value\n"); 549 goto end; 550 } 551 /* wiping secret data as we no longer need it */ 552 cleanse(hkey); 553 } 554 555 if ((benc = BIO_new(BIO_f_cipher())) == NULL) 556 goto end; 557 558 /* 559 * Since we may be changing parameters work on the encryption context 560 * rather than calling BIO_set_cipher(). 561 */ 562 563 BIO_get_cipher_ctx(benc, &ctx); 564 565 if (!EVP_CipherInit_ex(ctx, cipher, e, NULL, NULL, enc)) { 566 BIO_printf(bio_err, "Error setting cipher %s\n", 567 EVP_CIPHER_get0_name(cipher)); 568 ERR_print_errors(bio_err); 569 goto end; 570 } 571 572 if (nopad) 573 EVP_CIPHER_CTX_set_padding(ctx, 0); 574 575 if (!EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, enc)) { 576 BIO_printf(bio_err, "Error setting cipher %s\n", 577 EVP_CIPHER_get0_name(cipher)); 578 ERR_print_errors(bio_err); 579 goto end; 580 } 581 582 if (debug) { 583 BIO_set_callback_ex(benc, BIO_debug_callback_ex); 584 BIO_set_callback_arg(benc, (char *)bio_err); 585 } 586 587 if (printkey) { 588 if (!nosalt) { 589 printf("salt="); 590 for (i = 0; i < (int)sizeof(salt); i++) 591 printf("%02X", salt[i]); 592 printf("\n"); 593 } 594 if (EVP_CIPHER_get_key_length(cipher) > 0) { 595 printf("key="); 596 for (i = 0; i < EVP_CIPHER_get_key_length(cipher); i++) 597 printf("%02X", key[i]); 598 printf("\n"); 599 } 600 if (EVP_CIPHER_get_iv_length(cipher) > 0) { 601 printf("iv ="); 602 for (i = 0; i < EVP_CIPHER_get_iv_length(cipher); i++) 603 printf("%02X", iv[i]); 604 printf("\n"); 605 } 606 if (printkey == 2) { 607 ret = 0; 608 goto end; 609 } 610 } 611 } 612 613 /* Only encrypt/decrypt as we write the file */ 614 if (benc != NULL) 615 wbio = BIO_push(benc, wbio); 616 617 while (BIO_pending(rbio) || !BIO_eof(rbio)) { 618 inl = BIO_read(rbio, (char *)buff, bsize); 619 if (inl <= 0) 620 break; 621 if (BIO_write(wbio, (char *)buff, inl) != inl) { 622 BIO_printf(bio_err, "error writing output file\n"); 623 goto end; 624 } 625 } 626 if (!BIO_flush(wbio)) { 627 if (enc) 628 BIO_printf(bio_err, "bad encrypt\n"); 629 else 630 BIO_printf(bio_err, "bad decrypt\n"); 631 goto end; 632 } 633 634 ret = 0; 635 if (verbose) { 636 BIO_printf(bio_err, "bytes read : %8ju\n", BIO_number_read(in)); 637 BIO_printf(bio_err, "bytes written: %8ju\n", BIO_number_written(out)); 638 } 639 end: 640 ERR_print_errors(bio_err); 641 OPENSSL_free(strbuf); 642 OPENSSL_free(buff); 643 BIO_free(in); 644 BIO_free_all(out); 645 BIO_free(benc); 646 BIO_free(b64); 647 EVP_MD_free(dgst); 648 EVP_CIPHER_free(cipher); 649 #ifdef ZLIB 650 BIO_free(bzl); 651 #endif 652 release_engine(e); 653 OPENSSL_free(pass); 654 return ret; 655 } 656 657 static void show_ciphers(const OBJ_NAME *name, void *arg) 658 { 659 struct doall_enc_ciphers *dec = (struct doall_enc_ciphers *)arg; 660 const EVP_CIPHER *cipher; 661 662 if (!islower((unsigned char)*name->name)) 663 return; 664 665 /* Filter out ciphers that we cannot use */ 666 cipher = EVP_get_cipherbyname(name->name); 667 if (cipher == NULL 668 || (EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) != 0 669 || EVP_CIPHER_get_mode(cipher) == EVP_CIPH_XTS_MODE) 670 return; 671 672 BIO_printf(dec->bio, "-%-25s", name->name); 673 if (++dec->n == 3) { 674 BIO_printf(dec->bio, "\n"); 675 dec->n = 0; 676 } else 677 BIO_printf(dec->bio, " "); 678 } 679 680 static int set_hex(const char *in, unsigned char *out, int size) 681 { 682 int i, n; 683 unsigned char j; 684 685 i = size * 2; 686 n = strlen(in); 687 if (n > i) { 688 BIO_printf(bio_err, "hex string is too long, ignoring excess\n"); 689 n = i; /* ignore exceeding part */ 690 } else if (n < i) { 691 BIO_printf(bio_err, "hex string is too short, padding with zero bytes to length\n"); 692 } 693 694 memset(out, 0, size); 695 for (i = 0; i < n; i++) { 696 j = (unsigned char)*in++; 697 if (!isxdigit(j)) { 698 BIO_printf(bio_err, "non-hex digit\n"); 699 return 0; 700 } 701 j = (unsigned char)OPENSSL_hexchar2int(j); 702 if (i & 1) 703 out[i / 2] |= j; 704 else 705 out[i / 2] = (j << 4); 706 } 707 return 1; 708 } 709