1 /* crypto/evp/evp_enc.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <stdio.h>
60 #include "cryptlib.h"
61 #include <openssl/evp.h>
62 #include <openssl/err.h>
63 #include <openssl/rand.h>
64 #ifndef OPENSSL_NO_ENGINE
65 # include <openssl/engine.h>
66 #endif
67 #ifdef OPENSSL_FIPS
68 # include <openssl/fips.h>
69 #endif
70 #include "evp_locl.h"
71
72 #ifdef OPENSSL_FIPS
73 # define M_do_cipher(ctx, out, in, inl) FIPS_cipher(ctx, out, in, inl)
74 #else
75 # define M_do_cipher(ctx, out, in, inl) ctx->cipher->do_cipher(ctx, out, in, inl)
76 #endif
77
78 const char EVP_version[] = "EVP" OPENSSL_VERSION_PTEXT;
79
EVP_CIPHER_CTX_init(EVP_CIPHER_CTX * ctx)80 void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
81 {
82 memset(ctx, 0, sizeof(EVP_CIPHER_CTX));
83 /* ctx->cipher=NULL; */
84 }
85
EVP_CIPHER_CTX_new(void)86 EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
87 {
88 EVP_CIPHER_CTX *ctx = OPENSSL_malloc(sizeof *ctx);
89 if (ctx)
90 EVP_CIPHER_CTX_init(ctx);
91 return ctx;
92 }
93
EVP_CipherInit(EVP_CIPHER_CTX * ctx,const EVP_CIPHER * cipher,const unsigned char * key,const unsigned char * iv,int enc)94 int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
95 const unsigned char *key, const unsigned char *iv, int enc)
96 {
97 if (cipher)
98 EVP_CIPHER_CTX_init(ctx);
99 return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc);
100 }
101
EVP_CipherInit_ex(EVP_CIPHER_CTX * ctx,const EVP_CIPHER * cipher,ENGINE * impl,const unsigned char * key,const unsigned char * iv,int enc)102 int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
103 ENGINE *impl, const unsigned char *key,
104 const unsigned char *iv, int enc)
105 {
106 if (enc == -1)
107 enc = ctx->encrypt;
108 else {
109 if (enc)
110 enc = 1;
111 ctx->encrypt = enc;
112 }
113 #ifndef OPENSSL_NO_ENGINE
114 /*
115 * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
116 * this context may already have an ENGINE! Try to avoid releasing the
117 * previous handle, re-querying for an ENGINE, and having a
118 * reinitialisation, when it may all be unecessary.
119 */
120 if (ctx->engine && ctx->cipher && (!cipher ||
121 (cipher
122 && (cipher->nid ==
123 ctx->cipher->nid))))
124 goto skip_to_init;
125 #endif
126 if (cipher) {
127 /*
128 * Ensure a context left lying around from last time is cleared (the
129 * previous check attempted to avoid this if the same ENGINE and
130 * EVP_CIPHER could be used).
131 */
132 if (ctx->cipher) {
133 unsigned long flags = ctx->flags;
134 EVP_CIPHER_CTX_cleanup(ctx);
135 /* Restore encrypt and flags */
136 ctx->encrypt = enc;
137 ctx->flags = flags;
138 }
139 #ifndef OPENSSL_NO_ENGINE
140 if (impl) {
141 if (!ENGINE_init(impl)) {
142 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
143 return 0;
144 }
145 } else
146 /* Ask if an ENGINE is reserved for this job */
147 impl = ENGINE_get_cipher_engine(cipher->nid);
148 if (impl) {
149 /* There's an ENGINE for this job ... (apparently) */
150 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
151 if (!c) {
152 /*
153 * One positive side-effect of US's export control history,
154 * is that we should at least be able to avoid using US
155 * mispellings of "initialisation"?
156 */
157 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
158 return 0;
159 }
160 /* We'll use the ENGINE's private cipher definition */
161 cipher = c;
162 /*
163 * Store the ENGINE functional reference so we know 'cipher' came
164 * from an ENGINE and we need to release it when done.
165 */
166 ctx->engine = impl;
167 } else
168 ctx->engine = NULL;
169 #endif
170
171 #ifdef OPENSSL_FIPS
172 if (FIPS_mode())
173 return FIPS_cipherinit(ctx, cipher, key, iv, enc);
174 #endif
175 ctx->cipher = cipher;
176 if (ctx->cipher->ctx_size) {
177 ctx->cipher_data = OPENSSL_malloc(ctx->cipher->ctx_size);
178 if (!ctx->cipher_data) {
179 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
180 return 0;
181 }
182 } else {
183 ctx->cipher_data = NULL;
184 }
185 ctx->key_len = cipher->key_len;
186 ctx->flags = 0;
187 if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
188 if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
189 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
190 return 0;
191 }
192 }
193 } else if (!ctx->cipher) {
194 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
195 return 0;
196 }
197 #ifndef OPENSSL_NO_ENGINE
198 skip_to_init:
199 #endif
200 #ifdef OPENSSL_FIPS
201 if (FIPS_mode())
202 return FIPS_cipherinit(ctx, cipher, key, iv, enc);
203 #endif
204 /* we assume block size is a power of 2 in *cryptUpdate */
205 OPENSSL_assert(ctx->cipher->block_size == 1
206 || ctx->cipher->block_size == 8
207 || ctx->cipher->block_size == 16);
208
209 if (!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
210 switch (EVP_CIPHER_CTX_mode(ctx)) {
211
212 case EVP_CIPH_STREAM_CIPHER:
213 case EVP_CIPH_ECB_MODE:
214 break;
215
216 case EVP_CIPH_CFB_MODE:
217 case EVP_CIPH_OFB_MODE:
218
219 ctx->num = 0;
220 /* fall-through */
221
222 case EVP_CIPH_CBC_MODE:
223
224 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
225 (int)sizeof(ctx->iv));
226 if (iv)
227 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
228 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
229 break;
230
231 case EVP_CIPH_CTR_MODE:
232 ctx->num = 0;
233 /* Don't reuse IV for CTR mode */
234 if (iv)
235 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
236 break;
237
238 default:
239 return 0;
240 break;
241 }
242 }
243
244 if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
245 if (!ctx->cipher->init(ctx, key, iv, enc))
246 return 0;
247 }
248 ctx->buf_len = 0;
249 ctx->final_used = 0;
250 ctx->block_mask = ctx->cipher->block_size - 1;
251 return 1;
252 }
253
EVP_CipherUpdate(EVP_CIPHER_CTX * ctx,unsigned char * out,int * outl,const unsigned char * in,int inl)254 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
255 const unsigned char *in, int inl)
256 {
257 if (ctx->encrypt)
258 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
259 else
260 return EVP_DecryptUpdate(ctx, out, outl, in, inl);
261 }
262
EVP_CipherFinal_ex(EVP_CIPHER_CTX * ctx,unsigned char * out,int * outl)263 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
264 {
265 if (ctx->encrypt)
266 return EVP_EncryptFinal_ex(ctx, out, outl);
267 else
268 return EVP_DecryptFinal_ex(ctx, out, outl);
269 }
270
EVP_CipherFinal(EVP_CIPHER_CTX * ctx,unsigned char * out,int * outl)271 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
272 {
273 if (ctx->encrypt)
274 return EVP_EncryptFinal(ctx, out, outl);
275 else
276 return EVP_DecryptFinal(ctx, out, outl);
277 }
278
EVP_EncryptInit(EVP_CIPHER_CTX * ctx,const EVP_CIPHER * cipher,const unsigned char * key,const unsigned char * iv)279 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
280 const unsigned char *key, const unsigned char *iv)
281 {
282 return EVP_CipherInit(ctx, cipher, key, iv, 1);
283 }
284
EVP_EncryptInit_ex(EVP_CIPHER_CTX * ctx,const EVP_CIPHER * cipher,ENGINE * impl,const unsigned char * key,const unsigned char * iv)285 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
286 ENGINE *impl, const unsigned char *key,
287 const unsigned char *iv)
288 {
289 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
290 }
291
EVP_DecryptInit(EVP_CIPHER_CTX * ctx,const EVP_CIPHER * cipher,const unsigned char * key,const unsigned char * iv)292 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
293 const unsigned char *key, const unsigned char *iv)
294 {
295 return EVP_CipherInit(ctx, cipher, key, iv, 0);
296 }
297
EVP_DecryptInit_ex(EVP_CIPHER_CTX * ctx,const EVP_CIPHER * cipher,ENGINE * impl,const unsigned char * key,const unsigned char * iv)298 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
299 ENGINE *impl, const unsigned char *key,
300 const unsigned char *iv)
301 {
302 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
303 }
304
EVP_EncryptUpdate(EVP_CIPHER_CTX * ctx,unsigned char * out,int * outl,const unsigned char * in,int inl)305 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
306 const unsigned char *in, int inl)
307 {
308 int i, j, bl;
309
310 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
311 i = M_do_cipher(ctx, out, in, inl);
312 if (i < 0)
313 return 0;
314 else
315 *outl = i;
316 return 1;
317 }
318
319 if (inl <= 0) {
320 *outl = 0;
321 return inl == 0;
322 }
323
324 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
325 if (M_do_cipher(ctx, out, in, inl)) {
326 *outl = inl;
327 return 1;
328 } else {
329 *outl = 0;
330 return 0;
331 }
332 }
333 i = ctx->buf_len;
334 bl = ctx->cipher->block_size;
335 OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
336 if (i != 0) {
337 if (i + inl < bl) {
338 memcpy(&(ctx->buf[i]), in, inl);
339 ctx->buf_len += inl;
340 *outl = 0;
341 return 1;
342 } else {
343 j = bl - i;
344 memcpy(&(ctx->buf[i]), in, j);
345 if (!M_do_cipher(ctx, out, ctx->buf, bl))
346 return 0;
347 inl -= j;
348 in += j;
349 out += bl;
350 *outl = bl;
351 }
352 } else
353 *outl = 0;
354 i = inl & (bl - 1);
355 inl -= i;
356 if (inl > 0) {
357 if (!M_do_cipher(ctx, out, in, inl))
358 return 0;
359 *outl += inl;
360 }
361
362 if (i != 0)
363 memcpy(ctx->buf, &(in[inl]), i);
364 ctx->buf_len = i;
365 return 1;
366 }
367
EVP_EncryptFinal(EVP_CIPHER_CTX * ctx,unsigned char * out,int * outl)368 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
369 {
370 int ret;
371 ret = EVP_EncryptFinal_ex(ctx, out, outl);
372 return ret;
373 }
374
EVP_EncryptFinal_ex(EVP_CIPHER_CTX * ctx,unsigned char * out,int * outl)375 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
376 {
377 int n, ret;
378 unsigned int i, b, bl;
379
380 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
381 ret = M_do_cipher(ctx, out, NULL, 0);
382 if (ret < 0)
383 return 0;
384 else
385 *outl = ret;
386 return 1;
387 }
388
389 b = ctx->cipher->block_size;
390 OPENSSL_assert(b <= sizeof ctx->buf);
391 if (b == 1) {
392 *outl = 0;
393 return 1;
394 }
395 bl = ctx->buf_len;
396 if (ctx->flags & EVP_CIPH_NO_PADDING) {
397 if (bl) {
398 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
399 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
400 return 0;
401 }
402 *outl = 0;
403 return 1;
404 }
405
406 n = b - bl;
407 for (i = bl; i < b; i++)
408 ctx->buf[i] = n;
409 ret = M_do_cipher(ctx, out, ctx->buf, b);
410
411 if (ret)
412 *outl = b;
413
414 return ret;
415 }
416
EVP_DecryptUpdate(EVP_CIPHER_CTX * ctx,unsigned char * out,int * outl,const unsigned char * in,int inl)417 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
418 const unsigned char *in, int inl)
419 {
420 int fix_len;
421 unsigned int b;
422
423 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
424 fix_len = M_do_cipher(ctx, out, in, inl);
425 if (fix_len < 0) {
426 *outl = 0;
427 return 0;
428 } else
429 *outl = fix_len;
430 return 1;
431 }
432
433 if (inl <= 0) {
434 *outl = 0;
435 return inl == 0;
436 }
437
438 if (ctx->flags & EVP_CIPH_NO_PADDING)
439 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
440
441 b = ctx->cipher->block_size;
442 OPENSSL_assert(b <= sizeof ctx->final);
443
444 if (ctx->final_used) {
445 memcpy(out, ctx->final, b);
446 out += b;
447 fix_len = 1;
448 } else
449 fix_len = 0;
450
451 if (!EVP_EncryptUpdate(ctx, out, outl, in, inl))
452 return 0;
453
454 /*
455 * if we have 'decrypted' a multiple of block size, make sure we have a
456 * copy of this last block
457 */
458 if (b > 1 && !ctx->buf_len) {
459 *outl -= b;
460 ctx->final_used = 1;
461 memcpy(ctx->final, &out[*outl], b);
462 } else
463 ctx->final_used = 0;
464
465 if (fix_len)
466 *outl += b;
467
468 return 1;
469 }
470
EVP_DecryptFinal(EVP_CIPHER_CTX * ctx,unsigned char * out,int * outl)471 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
472 {
473 int ret;
474 ret = EVP_DecryptFinal_ex(ctx, out, outl);
475 return ret;
476 }
477
EVP_DecryptFinal_ex(EVP_CIPHER_CTX * ctx,unsigned char * out,int * outl)478 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
479 {
480 int i, n;
481 unsigned int b;
482 *outl = 0;
483
484 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
485 i = M_do_cipher(ctx, out, NULL, 0);
486 if (i < 0)
487 return 0;
488 else
489 *outl = i;
490 return 1;
491 }
492
493 b = ctx->cipher->block_size;
494 if (ctx->flags & EVP_CIPH_NO_PADDING) {
495 if (ctx->buf_len) {
496 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
497 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
498 return 0;
499 }
500 *outl = 0;
501 return 1;
502 }
503 if (b > 1) {
504 if (ctx->buf_len || !ctx->final_used) {
505 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
506 return (0);
507 }
508 OPENSSL_assert(b <= sizeof ctx->final);
509
510 /*
511 * The following assumes that the ciphertext has been authenticated.
512 * Otherwise it provides a padding oracle.
513 */
514 n = ctx->final[b - 1];
515 if (n == 0 || n > (int)b) {
516 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
517 return (0);
518 }
519 for (i = 0; i < n; i++) {
520 if (ctx->final[--b] != n) {
521 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
522 return (0);
523 }
524 }
525 n = ctx->cipher->block_size - n;
526 for (i = 0; i < n; i++)
527 out[i] = ctx->final[i];
528 *outl = n;
529 } else
530 *outl = 0;
531 return (1);
532 }
533
EVP_CIPHER_CTX_free(EVP_CIPHER_CTX * ctx)534 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
535 {
536 if (ctx) {
537 EVP_CIPHER_CTX_cleanup(ctx);
538 OPENSSL_free(ctx);
539 }
540 }
541
EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX * c)542 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
543 {
544 #ifndef OPENSSL_FIPS
545 if (c->cipher != NULL) {
546 if (c->cipher->cleanup && !c->cipher->cleanup(c))
547 return 0;
548 /* Cleanse cipher context data */
549 if (c->cipher_data)
550 OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
551 }
552 if (c->cipher_data)
553 OPENSSL_free(c->cipher_data);
554 #endif
555 #ifndef OPENSSL_NO_ENGINE
556 if (c->engine)
557 /*
558 * The EVP_CIPHER we used belongs to an ENGINE, release the
559 * functional reference we held for this reason.
560 */
561 ENGINE_finish(c->engine);
562 #endif
563 #ifdef OPENSSL_FIPS
564 FIPS_cipher_ctx_cleanup(c);
565 #endif
566 memset(c, 0, sizeof(EVP_CIPHER_CTX));
567 return 1;
568 }
569
EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX * c,int keylen)570 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
571 {
572 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
573 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
574 if (c->key_len == keylen)
575 return 1;
576 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
577 c->key_len = keylen;
578 return 1;
579 }
580 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
581 return 0;
582 }
583
EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX * ctx,int pad)584 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
585 {
586 if (pad)
587 ctx->flags &= ~EVP_CIPH_NO_PADDING;
588 else
589 ctx->flags |= EVP_CIPH_NO_PADDING;
590 return 1;
591 }
592
EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX * ctx,int type,int arg,void * ptr)593 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
594 {
595 int ret;
596 if (!ctx->cipher) {
597 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
598 return 0;
599 }
600
601 if (!ctx->cipher->ctrl) {
602 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
603 return 0;
604 }
605
606 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
607 if (ret == -1) {
608 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
609 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
610 return 0;
611 }
612 return ret;
613 }
614
EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX * ctx,unsigned char * key)615 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
616 {
617 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
618 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
619 if (RAND_bytes(key, ctx->key_len) <= 0)
620 return 0;
621 return 1;
622 }
623
EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX * out,const EVP_CIPHER_CTX * in)624 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
625 {
626 if ((in == NULL) || (in->cipher == NULL)) {
627 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
628 return 0;
629 }
630 #ifndef OPENSSL_NO_ENGINE
631 /* Make sure it's safe to copy a cipher context using an ENGINE */
632 if (in->engine && !ENGINE_init(in->engine)) {
633 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
634 return 0;
635 }
636 #endif
637
638 EVP_CIPHER_CTX_cleanup(out);
639 memcpy(out, in, sizeof *out);
640
641 if (in->cipher_data && in->cipher->ctx_size) {
642 out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
643 if (!out->cipher_data) {
644 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
645 return 0;
646 }
647 memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
648 }
649
650 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
651 return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out);
652 return 1;
653 }
654