1 /*
2 * Copyright 1995-2022 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 static int set_hex(const char *in, unsigned char *out, int size);
34 static void show_ciphers(const OBJ_NAME *name, void *bio_);
35
36 struct doall_enc_ciphers {
37 BIO *bio;
38 int n;
39 };
40
41 typedef enum OPTION_choice {
42 OPT_COMMON,
43 OPT_LIST,
44 OPT_E, OPT_IN, OPT_OUT, OPT_PASS, OPT_ENGINE, OPT_D, OPT_P, OPT_V,
45 OPT_NOPAD, OPT_SALT, OPT_NOSALT, OPT_DEBUG, OPT_UPPER_P, OPT_UPPER_A,
46 OPT_A, OPT_Z, OPT_BUFSIZE, OPT_K, OPT_KFILE, OPT_UPPER_K, OPT_NONE,
47 OPT_UPPER_S, OPT_IV, OPT_MD, OPT_ITER, OPT_PBKDF2, OPT_CIPHER,
48 OPT_R_ENUM, OPT_PROV_ENUM
49 } OPTION_CHOICE;
50
51 const OPTIONS enc_options[] = {
52 OPT_SECTION("General"),
53 {"help", OPT_HELP, '-', "Display this summary"},
54 {"list", OPT_LIST, '-', "List ciphers"},
55 #ifndef OPENSSL_NO_DEPRECATED_3_0
56 {"ciphers", OPT_LIST, '-', "Alias for -list"},
57 #endif
58 {"e", OPT_E, '-', "Encrypt"},
59 {"d", OPT_D, '-', "Decrypt"},
60 {"p", OPT_P, '-', "Print the iv/key"},
61 {"P", OPT_UPPER_P, '-', "Print the iv/key and exit"},
62 #ifndef OPENSSL_NO_ENGINE
63 {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
64 #endif
65
66 OPT_SECTION("Input"),
67 {"in", OPT_IN, '<', "Input file"},
68 {"k", OPT_K, 's', "Passphrase"},
69 {"kfile", OPT_KFILE, '<', "Read passphrase from file"},
70
71 OPT_SECTION("Output"),
72 {"out", OPT_OUT, '>', "Output file"},
73 {"pass", OPT_PASS, 's', "Passphrase source"},
74 {"v", OPT_V, '-', "Verbose output"},
75 {"a", OPT_A, '-', "Base64 encode/decode, depending on encryption flag"},
76 {"base64", OPT_A, '-', "Same as option -a"},
77 {"A", OPT_UPPER_A, '-',
78 "Used with -[base64|a] to specify base64 buffer as a single line"},
79
80 OPT_SECTION("Encryption"),
81 {"nopad", OPT_NOPAD, '-', "Disable standard block padding"},
82 {"salt", OPT_SALT, '-', "Use salt in the KDF (default)"},
83 {"nosalt", OPT_NOSALT, '-', "Do not use salt in the KDF"},
84 {"debug", OPT_DEBUG, '-', "Print debug info"},
85
86 {"bufsize", OPT_BUFSIZE, 's', "Buffer size"},
87 {"K", OPT_UPPER_K, 's', "Raw key, in hex"},
88 {"S", OPT_UPPER_S, 's', "Salt, in hex"},
89 {"iv", OPT_IV, 's', "IV in hex"},
90 {"md", OPT_MD, 's', "Use specified digest to create a key from the passphrase"},
91 {"iter", OPT_ITER, 'p', "Specify the iteration count and force use of PBKDF2"},
92 {"pbkdf2", OPT_PBKDF2, '-', "Use password-based key derivation function 2"},
93 {"none", OPT_NONE, '-', "Don't encrypt"},
94 #ifdef ZLIB
95 {"z", OPT_Z, '-', "Compress or decompress encrypted data using zlib"},
96 #endif
97 {"", OPT_CIPHER, '-', "Any supported cipher"},
98
99 OPT_R_OPTIONS,
100 OPT_PROV_OPTIONS,
101 {NULL}
102 };
103
enc_main(int argc,char ** argv)104 int enc_main(int argc, char **argv)
105 {
106 static char buf[128];
107 static const char magic[] = "Salted__";
108 ENGINE *e = NULL;
109 BIO *in = NULL, *out = NULL, *b64 = NULL, *benc = NULL, *rbio =
110 NULL, *wbio = NULL;
111 EVP_CIPHER_CTX *ctx = NULL;
112 EVP_CIPHER *cipher = NULL;
113 EVP_MD *dgst = NULL;
114 const char *digestname = NULL;
115 char *hkey = NULL, *hiv = NULL, *hsalt = NULL, *p;
116 char *infile = NULL, *outfile = NULL, *prog;
117 char *str = NULL, *passarg = NULL, *pass = NULL, *strbuf = NULL;
118 const char *ciphername = NULL;
119 char mbuf[sizeof(magic) - 1];
120 OPTION_CHOICE o;
121 int bsize = BSIZE, verbose = 0, debug = 0, olb64 = 0, nosalt = 0;
122 int enc = 1, printkey = 0, i, k;
123 int base64 = 0, informat = FORMAT_BINARY, outformat = FORMAT_BINARY;
124 int ret = 1, inl, nopad = 0;
125 unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
126 unsigned char *buff = NULL, salt[PKCS5_SALT_LEN];
127 int pbkdf2 = 0;
128 int iter = 0;
129 long n;
130 int streamable = 1;
131 int wrap = 0;
132 struct doall_enc_ciphers dec;
133 #ifdef ZLIB
134 int do_zlib = 0;
135 BIO *bzl = NULL;
136 #endif
137
138 /* first check the command name */
139 if (strcmp(argv[0], "base64") == 0)
140 base64 = 1;
141 #ifdef ZLIB
142 else if (strcmp(argv[0], "zlib") == 0)
143 do_zlib = 1;
144 #endif
145 else if (strcmp(argv[0], "enc") != 0)
146 ciphername = argv[0];
147
148 opt_set_unknown_name("cipher");
149 prog = opt_init(argc, argv, enc_options);
150 while ((o = opt_next()) != OPT_EOF) {
151 switch (o) {
152 case OPT_EOF:
153 case OPT_ERR:
154 opthelp:
155 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
156 goto end;
157 case OPT_HELP:
158 opt_help(enc_options);
159 ret = 0;
160 goto end;
161 case OPT_LIST:
162 BIO_printf(bio_out, "Supported ciphers:\n");
163 dec.bio = bio_out;
164 dec.n = 0;
165 OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH,
166 show_ciphers, &dec);
167 BIO_printf(bio_out, "\n");
168 ret = 0;
169 goto end;
170 case OPT_E:
171 enc = 1;
172 break;
173 case OPT_IN:
174 infile = opt_arg();
175 break;
176 case OPT_OUT:
177 outfile = opt_arg();
178 break;
179 case OPT_PASS:
180 passarg = opt_arg();
181 break;
182 case OPT_ENGINE:
183 e = setup_engine(opt_arg(), 0);
184 break;
185 case OPT_D:
186 enc = 0;
187 break;
188 case OPT_P:
189 printkey = 1;
190 break;
191 case OPT_V:
192 verbose = 1;
193 break;
194 case OPT_NOPAD:
195 nopad = 1;
196 break;
197 case OPT_SALT:
198 nosalt = 0;
199 break;
200 case OPT_NOSALT:
201 nosalt = 1;
202 break;
203 case OPT_DEBUG:
204 debug = 1;
205 break;
206 case OPT_UPPER_P:
207 printkey = 2;
208 break;
209 case OPT_UPPER_A:
210 olb64 = 1;
211 break;
212 case OPT_A:
213 base64 = 1;
214 break;
215 case OPT_Z:
216 #ifdef ZLIB
217 do_zlib = 1;
218 #endif
219 break;
220 case OPT_BUFSIZE:
221 p = opt_arg();
222 i = (int)strlen(p) - 1;
223 k = i >= 1 && p[i] == 'k';
224 if (k)
225 p[i] = '\0';
226 if (!opt_long(opt_arg(), &n)
227 || n < 0 || (k && n >= LONG_MAX / 1024))
228 goto opthelp;
229 if (k)
230 n *= 1024;
231 bsize = (int)n;
232 break;
233 case OPT_K:
234 str = opt_arg();
235 break;
236 case OPT_KFILE:
237 in = bio_open_default(opt_arg(), 'r', FORMAT_TEXT);
238 if (in == NULL)
239 goto opthelp;
240 i = BIO_gets(in, buf, sizeof(buf));
241 BIO_free(in);
242 in = NULL;
243 if (i <= 0) {
244 BIO_printf(bio_err,
245 "%s Can't read key from %s\n", prog, opt_arg());
246 goto opthelp;
247 }
248 while (--i > 0 && (buf[i] == '\r' || buf[i] == '\n'))
249 buf[i] = '\0';
250 if (i <= 0) {
251 BIO_printf(bio_err, "%s: zero length password\n", prog);
252 goto opthelp;
253 }
254 str = buf;
255 break;
256 case OPT_UPPER_K:
257 hkey = opt_arg();
258 break;
259 case OPT_UPPER_S:
260 hsalt = opt_arg();
261 break;
262 case OPT_IV:
263 hiv = opt_arg();
264 break;
265 case OPT_MD:
266 digestname = opt_arg();
267 break;
268 case OPT_CIPHER:
269 ciphername = opt_unknown();
270 break;
271 case OPT_ITER:
272 iter = opt_int_arg();
273 pbkdf2 = 1;
274 break;
275 case OPT_PBKDF2:
276 pbkdf2 = 1;
277 if (iter == 0) /* do not overwrite a chosen value */
278 iter = 10000;
279 break;
280 case OPT_NONE:
281 cipher = NULL;
282 break;
283 case OPT_R_CASES:
284 if (!opt_rand(o))
285 goto end;
286 break;
287 case OPT_PROV_CASES:
288 if (!opt_provider(o))
289 goto end;
290 break;
291 }
292 }
293
294 /* No extra arguments. */
295 if (!opt_check_rest_arg(NULL))
296 goto opthelp;
297 if (!app_RAND_load())
298 goto end;
299
300 /* Get the cipher name, either from progname (if set) or flag. */
301 if (!opt_cipher(ciphername, &cipher))
302 goto opthelp;
303 if (cipher && (EVP_CIPHER_mode(cipher) == EVP_CIPH_WRAP_MODE)) {
304 wrap = 1;
305 streamable = 0;
306 }
307 if (digestname != NULL) {
308 if (!opt_md(digestname, &dgst))
309 goto opthelp;
310 }
311 if (dgst == NULL)
312 dgst = (EVP_MD *)EVP_sha256();
313
314 if (iter == 0)
315 iter = 1;
316
317 /* It must be large enough for a base64 encoded line */
318 if (base64 && bsize < 80)
319 bsize = 80;
320 if (verbose)
321 BIO_printf(bio_err, "bufsize=%d\n", bsize);
322
323 #ifdef ZLIB
324 if (!do_zlib)
325 #endif
326 if (base64) {
327 if (enc)
328 outformat = FORMAT_BASE64;
329 else
330 informat = FORMAT_BASE64;
331 }
332
333 strbuf = app_malloc(SIZE, "strbuf");
334 buff = app_malloc(EVP_ENCODE_LENGTH(bsize), "evp buffer");
335
336 if (infile == NULL) {
337 if (!streamable && printkey != 2) { /* if just print key and exit, it's ok */
338 BIO_printf(bio_err, "Unstreamable cipher mode\n");
339 goto end;
340 }
341 in = dup_bio_in(informat);
342 } else {
343 in = bio_open_default(infile, 'r', informat);
344 }
345 if (in == NULL)
346 goto end;
347
348 if (str == NULL && passarg != NULL) {
349 if (!app_passwd(passarg, NULL, &pass, NULL)) {
350 BIO_printf(bio_err, "Error getting password\n");
351 goto end;
352 }
353 str = pass;
354 }
355
356 if ((str == NULL) && (cipher != NULL) && (hkey == NULL)) {
357 if (1) {
358 #ifndef OPENSSL_NO_UI_CONSOLE
359 for (;;) {
360 char prompt[200];
361
362 BIO_snprintf(prompt, sizeof(prompt), "enter %s %s password:",
363 EVP_CIPHER_get0_name(cipher),
364 (enc) ? "encryption" : "decryption");
365 strbuf[0] = '\0';
366 i = EVP_read_pw_string((char *)strbuf, SIZE, prompt, enc);
367 if (i == 0) {
368 if (strbuf[0] == '\0') {
369 ret = 1;
370 goto end;
371 }
372 str = strbuf;
373 break;
374 }
375 if (i < 0) {
376 BIO_printf(bio_err, "bad password read\n");
377 goto end;
378 }
379 }
380 } else {
381 #endif
382 BIO_printf(bio_err, "password required\n");
383 goto end;
384 }
385 }
386
387 out = bio_open_default(outfile, 'w', outformat);
388 if (out == NULL)
389 goto end;
390
391 if (debug) {
392 BIO_set_callback_ex(in, BIO_debug_callback_ex);
393 BIO_set_callback_ex(out, BIO_debug_callback_ex);
394 BIO_set_callback_arg(in, (char *)bio_err);
395 BIO_set_callback_arg(out, (char *)bio_err);
396 }
397
398 rbio = in;
399 wbio = out;
400
401 #ifdef ZLIB
402 if (do_zlib) {
403 if ((bzl = BIO_new(BIO_f_zlib())) == NULL)
404 goto end;
405 if (debug) {
406 BIO_set_callback_ex(bzl, BIO_debug_callback_ex);
407 BIO_set_callback_arg(bzl, (char *)bio_err);
408 }
409 if (enc)
410 wbio = BIO_push(bzl, wbio);
411 else
412 rbio = BIO_push(bzl, rbio);
413 }
414 #endif
415
416 if (base64) {
417 if ((b64 = BIO_new(BIO_f_base64())) == NULL)
418 goto end;
419 if (debug) {
420 BIO_set_callback_ex(b64, BIO_debug_callback_ex);
421 BIO_set_callback_arg(b64, (char *)bio_err);
422 }
423 if (olb64)
424 BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
425 if (enc)
426 wbio = BIO_push(b64, wbio);
427 else
428 rbio = BIO_push(b64, rbio);
429 }
430
431 if (cipher != NULL) {
432 if (str != NULL) { /* a passphrase is available */
433 /*
434 * Salt handling: if encrypting generate a salt if not supplied,
435 * and write to output BIO. If decrypting use salt from input BIO
436 * if not given with args
437 */
438 unsigned char *sptr;
439 size_t str_len = strlen(str);
440
441 if (nosalt) {
442 sptr = NULL;
443 } else {
444 if (hsalt != NULL && !set_hex(hsalt, salt, sizeof(salt))) {
445 BIO_printf(bio_err, "invalid hex salt value\n");
446 goto end;
447 }
448 if (enc) { /* encryption */
449 if (hsalt == NULL) {
450 if (RAND_bytes(salt, sizeof(salt)) <= 0) {
451 BIO_printf(bio_err, "RAND_bytes failed\n");
452 goto end;
453 }
454 /*
455 * If -P option then don't bother writing.
456 * If salt is given, shouldn't either ?
457 */
458 if ((printkey != 2)
459 && (BIO_write(wbio, magic,
460 sizeof(magic) - 1) != sizeof(magic) - 1
461 || BIO_write(wbio,
462 (char *)salt,
463 sizeof(salt)) != sizeof(salt))) {
464 BIO_printf(bio_err, "error writing output file\n");
465 goto end;
466 }
467 }
468 } else { /* decryption */
469 if (hsalt == NULL) {
470 if (BIO_read(rbio, mbuf, sizeof(mbuf)) != sizeof(mbuf)) {
471 BIO_printf(bio_err, "error reading input file\n");
472 goto end;
473 }
474 if (memcmp(mbuf, magic, sizeof(mbuf)) == 0) { /* file IS salted */
475 if (BIO_read(rbio, salt,
476 sizeof(salt)) != sizeof(salt)) {
477 BIO_printf(bio_err, "error reading input file\n");
478 goto end;
479 }
480 } else { /* file is NOT salted, NO salt available */
481 BIO_printf(bio_err, "bad magic number\n");
482 goto end;
483 }
484 }
485 }
486 sptr = salt;
487 }
488
489 if (pbkdf2 == 1) {
490 /*
491 * derive key and default iv
492 * concatenated into a temporary buffer
493 */
494 unsigned char tmpkeyiv[EVP_MAX_KEY_LENGTH + EVP_MAX_IV_LENGTH];
495 int iklen = EVP_CIPHER_get_key_length(cipher);
496 int ivlen = EVP_CIPHER_get_iv_length(cipher);
497 /* not needed if HASH_UPDATE() is fixed : */
498 int islen = (sptr != NULL ? sizeof(salt) : 0);
499 if (!PKCS5_PBKDF2_HMAC(str, str_len, sptr, islen,
500 iter, dgst, iklen+ivlen, tmpkeyiv)) {
501 BIO_printf(bio_err, "PKCS5_PBKDF2_HMAC failed\n");
502 goto end;
503 }
504 /* split and move data back to global buffer */
505 memcpy(key, tmpkeyiv, iklen);
506 memcpy(iv, tmpkeyiv+iklen, ivlen);
507 } else {
508 BIO_printf(bio_err, "*** WARNING : "
509 "deprecated key derivation used.\n"
510 "Using -iter or -pbkdf2 would be better.\n");
511 if (!EVP_BytesToKey(cipher, dgst, sptr,
512 (unsigned char *)str, str_len,
513 1, key, iv)) {
514 BIO_printf(bio_err, "EVP_BytesToKey failed\n");
515 goto end;
516 }
517 }
518 /*
519 * zero the complete buffer or the string passed from the command
520 * line.
521 */
522 if (str == strbuf)
523 OPENSSL_cleanse(str, SIZE);
524 else
525 OPENSSL_cleanse(str, str_len);
526 }
527 if (hiv != NULL) {
528 int siz = EVP_CIPHER_get_iv_length(cipher);
529 if (siz == 0) {
530 BIO_printf(bio_err, "warning: iv not used by this cipher\n");
531 } else if (!set_hex(hiv, iv, siz)) {
532 BIO_printf(bio_err, "invalid hex iv value\n");
533 goto end;
534 }
535 }
536 if ((hiv == NULL) && (str == NULL)
537 && EVP_CIPHER_get_iv_length(cipher) != 0
538 && wrap == 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 (wrap == 1)
566 EVP_CIPHER_CTX_set_flags(ctx, EVP_CIPHER_CTX_FLAG_WRAP_ALLOW);
567
568 if (!EVP_CipherInit_ex(ctx, cipher, e, NULL, NULL, enc)) {
569 BIO_printf(bio_err, "Error setting cipher %s\n",
570 EVP_CIPHER_get0_name(cipher));
571 ERR_print_errors(bio_err);
572 goto end;
573 }
574
575 if (nopad)
576 EVP_CIPHER_CTX_set_padding(ctx, 0);
577
578 if (!EVP_CipherInit_ex(ctx, NULL, NULL, key,
579 (hiv == NULL && wrap == 1 ? NULL : iv), enc)) {
580 BIO_printf(bio_err, "Error setting cipher %s\n",
581 EVP_CIPHER_get0_name(cipher));
582 ERR_print_errors(bio_err);
583 goto end;
584 }
585
586 if (debug) {
587 BIO_set_callback_ex(benc, BIO_debug_callback_ex);
588 BIO_set_callback_arg(benc, (char *)bio_err);
589 }
590
591 if (printkey) {
592 if (!nosalt) {
593 printf("salt=");
594 for (i = 0; i < (int)sizeof(salt); i++)
595 printf("%02X", salt[i]);
596 printf("\n");
597 }
598 if (EVP_CIPHER_get_key_length(cipher) > 0) {
599 printf("key=");
600 for (i = 0; i < EVP_CIPHER_get_key_length(cipher); i++)
601 printf("%02X", key[i]);
602 printf("\n");
603 }
604 if (EVP_CIPHER_get_iv_length(cipher) > 0) {
605 printf("iv =");
606 for (i = 0; i < EVP_CIPHER_get_iv_length(cipher); i++)
607 printf("%02X", iv[i]);
608 printf("\n");
609 }
610 if (printkey == 2) {
611 ret = 0;
612 goto end;
613 }
614 }
615 }
616
617 /* Only encrypt/decrypt as we write the file */
618 if (benc != NULL)
619 wbio = BIO_push(benc, wbio);
620
621 while (BIO_pending(rbio) || !BIO_eof(rbio)) {
622 inl = BIO_read(rbio, (char *)buff, bsize);
623 if (inl <= 0)
624 break;
625 if (!streamable && !BIO_eof(rbio)) { /* do not output data */
626 BIO_printf(bio_err, "Unstreamable cipher mode\n");
627 goto end;
628 }
629 if (BIO_write(wbio, (char *)buff, inl) != inl) {
630 BIO_printf(bio_err, "error writing output file\n");
631 goto end;
632 }
633 if (!streamable)
634 break;
635 }
636 if (!BIO_flush(wbio)) {
637 BIO_printf(bio_err, "bad decrypt\n");
638 goto end;
639 }
640
641 ret = 0;
642 if (verbose) {
643 BIO_printf(bio_err, "bytes read : %8ju\n", BIO_number_read(in));
644 BIO_printf(bio_err, "bytes written: %8ju\n", BIO_number_written(out));
645 }
646 end:
647 ERR_print_errors(bio_err);
648 OPENSSL_free(strbuf);
649 OPENSSL_free(buff);
650 BIO_free(in);
651 BIO_free_all(out);
652 BIO_free(benc);
653 BIO_free(b64);
654 EVP_MD_free(dgst);
655 EVP_CIPHER_free(cipher);
656 #ifdef ZLIB
657 BIO_free(bzl);
658 #endif
659 release_engine(e);
660 OPENSSL_free(pass);
661 return ret;
662 }
663
show_ciphers(const OBJ_NAME * name,void * arg)664 static void show_ciphers(const OBJ_NAME *name, void *arg)
665 {
666 struct doall_enc_ciphers *dec = (struct doall_enc_ciphers *)arg;
667 const EVP_CIPHER *cipher;
668
669 if (!islower((unsigned char)*name->name))
670 return;
671
672 /* Filter out ciphers that we cannot use */
673 cipher = EVP_get_cipherbyname(name->name);
674 if (cipher == NULL
675 || (EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) != 0
676 || EVP_CIPHER_get_mode(cipher) == EVP_CIPH_XTS_MODE)
677 return;
678
679 BIO_printf(dec->bio, "-%-25s", name->name);
680 if (++dec->n == 3) {
681 BIO_printf(dec->bio, "\n");
682 dec->n = 0;
683 } else
684 BIO_printf(dec->bio, " ");
685 }
686
set_hex(const char * in,unsigned char * out,int size)687 static int set_hex(const char *in, unsigned char *out, int size)
688 {
689 int i, n;
690 unsigned char j;
691
692 i = size * 2;
693 n = strlen(in);
694 if (n > i) {
695 BIO_printf(bio_err, "hex string is too long, ignoring excess\n");
696 n = i; /* ignore exceeding part */
697 } else if (n < i) {
698 BIO_printf(bio_err, "hex string is too short, padding with zero bytes to length\n");
699 }
700
701 memset(out, 0, size);
702 for (i = 0; i < n; i++) {
703 j = (unsigned char)*in++;
704 if (!isxdigit(j)) {
705 BIO_printf(bio_err, "non-hex digit\n");
706 return 0;
707 }
708 j = (unsigned char)OPENSSL_hexchar2int(j);
709 if (i & 1)
710 out[i / 2] |= j;
711 else
712 out[i / 2] = (j << 4);
713 }
714 return 1;
715 }
716
