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
enc_main(int argc,char ** argv)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 BIO_printf(bio_err, "bad decrypt\n");
628 goto end;
629 }
630
631 ret = 0;
632 if (verbose) {
633 BIO_printf(bio_err, "bytes read : %8ju\n", BIO_number_read(in));
634 BIO_printf(bio_err, "bytes written: %8ju\n", BIO_number_written(out));
635 }
636 end:
637 ERR_print_errors(bio_err);
638 OPENSSL_free(strbuf);
639 OPENSSL_free(buff);
640 BIO_free(in);
641 BIO_free_all(out);
642 BIO_free(benc);
643 BIO_free(b64);
644 EVP_MD_free(dgst);
645 EVP_CIPHER_free(cipher);
646 #ifdef ZLIB
647 BIO_free(bzl);
648 #endif
649 release_engine(e);
650 OPENSSL_free(pass);
651 return ret;
652 }
653
show_ciphers(const OBJ_NAME * name,void * arg)654 static void show_ciphers(const OBJ_NAME *name, void *arg)
655 {
656 struct doall_enc_ciphers *dec = (struct doall_enc_ciphers *)arg;
657 const EVP_CIPHER *cipher;
658
659 if (!islower((unsigned char)*name->name))
660 return;
661
662 /* Filter out ciphers that we cannot use */
663 cipher = EVP_get_cipherbyname(name->name);
664 if (cipher == NULL
665 || (EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) != 0
666 || EVP_CIPHER_get_mode(cipher) == EVP_CIPH_XTS_MODE)
667 return;
668
669 BIO_printf(dec->bio, "-%-25s", name->name);
670 if (++dec->n == 3) {
671 BIO_printf(dec->bio, "\n");
672 dec->n = 0;
673 } else
674 BIO_printf(dec->bio, " ");
675 }
676
set_hex(const char * in,unsigned char * out,int size)677 static int set_hex(const char *in, unsigned char *out, int size)
678 {
679 int i, n;
680 unsigned char j;
681
682 i = size * 2;
683 n = strlen(in);
684 if (n > i) {
685 BIO_printf(bio_err, "hex string is too long, ignoring excess\n");
686 n = i; /* ignore exceeding part */
687 } else if (n < i) {
688 BIO_printf(bio_err, "hex string is too short, padding with zero bytes to length\n");
689 }
690
691 memset(out, 0, size);
692 for (i = 0; i < n; i++) {
693 j = (unsigned char)*in++;
694 if (!isxdigit(j)) {
695 BIO_printf(bio_err, "non-hex digit\n");
696 return 0;
697 }
698 j = (unsigned char)OPENSSL_hexchar2int(j);
699 if (i & 1)
700 out[i / 2] |= j;
701 else
702 out[i / 2] = (j << 4);
703 }
704 return 1;
705 }
706