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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 "internal/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 | #include "internal/evp_int.h" | |
68 | #include "evp_locl.h" | |
69 | ||
70 | int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *c) | |
71 | { | |
72 | if (c == NULL) | |
73 | return 1; | |
74 | if (c->cipher != NULL) { | |
75 | if (c->cipher->cleanup && !c->cipher->cleanup(c)) | |
76 | return 0; | |
77 | /* Cleanse cipher context data */ | |
78 | if (c->cipher_data && c->cipher->ctx_size) | |
79 | OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); | |
80 | } | |
81 | OPENSSL_free(c->cipher_data); | |
82 | #ifndef OPENSSL_NO_ENGINE | |
83 | if (c->engine) | |
84 | /* | |
85 | * The EVP_CIPHER we used belongs to an ENGINE, release the | |
86 | * functional reference we held for this reason. | |
87 | */ | |
88 | ENGINE_finish(c->engine); | |
89 | #endif | |
90 | memset(c, 0, sizeof(*c)); | |
91 | return 1; | |
92 | } | |
93 | ||
94 | EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) | |
95 | { | |
96 | return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX)); | |
97 | } | |
98 | ||
99 | void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) | |
100 | { | |
101 | EVP_CIPHER_CTX_reset(ctx); | |
102 | OPENSSL_free(ctx); | |
103 | } | |
104 | ||
105 | int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, | |
106 | const unsigned char *key, const unsigned char *iv, int enc) | |
107 | { | |
108 | EVP_CIPHER_CTX_reset(ctx); | |
109 | return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc); | |
110 | } | |
111 | ||
112 | int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, | |
113 | ENGINE *impl, const unsigned char *key, | |
114 | const unsigned char *iv, int enc) | |
115 | { | |
116 | if (enc == -1) | |
117 | enc = ctx->encrypt; | |
118 | else { | |
119 | if (enc) | |
120 | enc = 1; | |
121 | ctx->encrypt = enc; | |
122 | } | |
123 | #ifndef OPENSSL_NO_ENGINE | |
124 | /* | |
125 | * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so | |
126 | * this context may already have an ENGINE! Try to avoid releasing the | |
127 | * previous handle, re-querying for an ENGINE, and having a | |
128 | * reinitialisation, when it may all be unecessary. | |
129 | */ | |
130 | if (ctx->engine && ctx->cipher | |
131 | && (!cipher || (cipher && (cipher->nid == ctx->cipher->nid)))) | |
132 | goto skip_to_init; | |
133 | #endif | |
134 | if (cipher) { | |
135 | /* | |
136 | * Ensure a context left lying around from last time is cleared (the | |
137 | * previous check attempted to avoid this if the same ENGINE and | |
138 | * EVP_CIPHER could be used). | |
139 | */ | |
140 | if (ctx->cipher) { | |
141 | unsigned long flags = ctx->flags; | |
142 | EVP_CIPHER_CTX_reset(ctx); | |
143 | /* Restore encrypt and flags */ | |
144 | ctx->encrypt = enc; | |
145 | ctx->flags = flags; | |
146 | } | |
147 | #ifndef OPENSSL_NO_ENGINE | |
148 | if (impl) { | |
149 | if (!ENGINE_init(impl)) { | |
150 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
151 | return 0; | |
152 | } | |
153 | } else | |
154 | /* Ask if an ENGINE is reserved for this job */ | |
155 | impl = ENGINE_get_cipher_engine(cipher->nid); | |
156 | if (impl) { | |
157 | /* There's an ENGINE for this job ... (apparently) */ | |
158 | const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid); | |
159 | if (!c) { | |
160 | /* | |
161 | * One positive side-effect of US's export control history, | |
162 | * is that we should at least be able to avoid using US | |
163 | * mispellings of "initialisation"? | |
164 | */ | |
165 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
166 | return 0; | |
167 | } | |
168 | /* We'll use the ENGINE's private cipher definition */ | |
169 | cipher = c; | |
170 | /* | |
171 | * Store the ENGINE functional reference so we know 'cipher' came | |
172 | * from an ENGINE and we need to release it when done. | |
173 | */ | |
174 | ctx->engine = impl; | |
175 | } else | |
176 | ctx->engine = NULL; | |
177 | #endif | |
178 | ||
179 | ctx->cipher = cipher; | |
180 | if (ctx->cipher->ctx_size) { | |
181 | ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size); | |
182 | if (ctx->cipher_data == NULL) { | |
183 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); | |
184 | return 0; | |
185 | } | |
186 | } else { | |
187 | ctx->cipher_data = NULL; | |
188 | } | |
189 | ctx->key_len = cipher->key_len; | |
190 | /* Preserve wrap enable flag, zero everything else */ | |
191 | ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW; | |
192 | if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { | |
193 | if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { | |
194 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
195 | return 0; | |
196 | } | |
197 | } | |
198 | } else if (!ctx->cipher) { | |
199 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); | |
200 | return 0; | |
201 | } | |
202 | #ifndef OPENSSL_NO_ENGINE | |
203 | skip_to_init: | |
204 | #endif | |
205 | /* we assume block size is a power of 2 in *cryptUpdate */ | |
206 | OPENSSL_assert(ctx->cipher->block_size == 1 | |
207 | || ctx->cipher->block_size == 8 | |
208 | || ctx->cipher->block_size == 16); | |
209 | ||
210 | if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW) | |
211 | && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) { | |
212 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) { | |
217 | switch (EVP_CIPHER_CTX_mode(ctx)) { | |
218 | ||
219 | case EVP_CIPH_STREAM_CIPHER: | |
220 | case EVP_CIPH_ECB_MODE: | |
221 | break; | |
222 | ||
223 | case EVP_CIPH_CFB_MODE: | |
224 | case EVP_CIPH_OFB_MODE: | |
225 | ||
226 | ctx->num = 0; | |
227 | /* fall-through */ | |
228 | ||
229 | case EVP_CIPH_CBC_MODE: | |
230 | ||
231 | OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= | |
232 | (int)sizeof(ctx->iv)); | |
233 | if (iv) | |
234 | memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
235 | memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); | |
236 | break; | |
237 | ||
238 | case EVP_CIPH_CTR_MODE: | |
239 | ctx->num = 0; | |
240 | /* Don't reuse IV for CTR mode */ | |
241 | if (iv) | |
242 | memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
243 | break; | |
244 | ||
245 | default: | |
246 | return 0; | |
247 | } | |
248 | } | |
249 | ||
250 | if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { | |
251 | if (!ctx->cipher->init(ctx, key, iv, enc)) | |
252 | return 0; | |
253 | } | |
254 | ctx->buf_len = 0; | |
255 | ctx->final_used = 0; | |
256 | ctx->block_mask = ctx->cipher->block_size - 1; | |
257 | return 1; | |
258 | } | |
259 | ||
260 | int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, | |
261 | const unsigned char *in, int inl) | |
262 | { | |
263 | if (ctx->encrypt) | |
264 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
265 | else | |
266 | return EVP_DecryptUpdate(ctx, out, outl, in, inl); | |
267 | } | |
268 | ||
269 | int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
270 | { | |
271 | if (ctx->encrypt) | |
272 | return EVP_EncryptFinal_ex(ctx, out, outl); | |
273 | else | |
274 | return EVP_DecryptFinal_ex(ctx, out, outl); | |
275 | } | |
276 | ||
277 | int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
278 | { | |
279 | if (ctx->encrypt) | |
280 | return EVP_EncryptFinal(ctx, out, outl); | |
281 | else | |
282 | return EVP_DecryptFinal(ctx, out, outl); | |
283 | } | |
284 | ||
285 | int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, | |
286 | const unsigned char *key, const unsigned char *iv) | |
287 | { | |
288 | return EVP_CipherInit(ctx, cipher, key, iv, 1); | |
289 | } | |
290 | ||
291 | int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, | |
292 | ENGINE *impl, const unsigned char *key, | |
293 | const unsigned char *iv) | |
294 | { | |
295 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); | |
296 | } | |
297 | ||
298 | int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, | |
299 | const unsigned char *key, const unsigned char *iv) | |
300 | { | |
301 | return EVP_CipherInit(ctx, cipher, key, iv, 0); | |
302 | } | |
303 | ||
304 | int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, | |
305 | ENGINE *impl, const unsigned char *key, | |
306 | const unsigned char *iv) | |
307 | { | |
308 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); | |
309 | } | |
310 | ||
311 | int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, | |
312 | const unsigned char *in, int inl) | |
313 | { | |
314 | int i, j, bl; | |
315 | ||
316 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
317 | i = ctx->cipher->do_cipher(ctx, out, in, inl); | |
318 | if (i < 0) | |
319 | return 0; | |
320 | else | |
321 | *outl = i; | |
322 | return 1; | |
323 | } | |
324 | ||
325 | if (inl <= 0) { | |
326 | *outl = 0; | |
327 | return inl == 0; | |
328 | } | |
329 | ||
330 | if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) { | |
331 | if (ctx->cipher->do_cipher(ctx, out, in, inl)) { | |
332 | *outl = inl; | |
333 | return 1; | |
334 | } else { | |
335 | *outl = 0; | |
336 | return 0; | |
337 | } | |
338 | } | |
339 | i = ctx->buf_len; | |
340 | bl = ctx->cipher->block_size; | |
341 | OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); | |
342 | if (i != 0) { | |
343 | if (i + inl < bl) { | |
344 | memcpy(&(ctx->buf[i]), in, inl); | |
345 | ctx->buf_len += inl; | |
346 | *outl = 0; | |
347 | return 1; | |
348 | } else { | |
349 | j = bl - i; | |
350 | memcpy(&(ctx->buf[i]), in, j); | |
351 | if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl)) | |
352 | return 0; | |
353 | inl -= j; | |
354 | in += j; | |
355 | out += bl; | |
356 | *outl = bl; | |
357 | } | |
358 | } else | |
359 | *outl = 0; | |
360 | i = inl & (bl - 1); | |
361 | inl -= i; | |
362 | if (inl > 0) { | |
363 | if (!ctx->cipher->do_cipher(ctx, out, in, inl)) | |
364 | return 0; | |
365 | *outl += inl; | |
366 | } | |
367 | ||
368 | if (i != 0) | |
369 | memcpy(ctx->buf, &(in[inl]), i); | |
370 | ctx->buf_len = i; | |
371 | return 1; | |
372 | } | |
373 | ||
374 | int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
375 | { | |
376 | int ret; | |
377 | ret = EVP_EncryptFinal_ex(ctx, out, outl); | |
378 | return ret; | |
379 | } | |
380 | ||
381 | int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
382 | { | |
383 | int n, ret; | |
384 | unsigned int i, b, bl; | |
385 | ||
386 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
387 | ret = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
388 | if (ret < 0) | |
389 | return 0; | |
390 | else | |
391 | *outl = ret; | |
392 | return 1; | |
393 | } | |
394 | ||
395 | b = ctx->cipher->block_size; | |
396 | OPENSSL_assert(b <= sizeof ctx->buf); | |
397 | if (b == 1) { | |
398 | *outl = 0; | |
399 | return 1; | |
400 | } | |
401 | bl = ctx->buf_len; | |
402 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
403 | if (bl) { | |
404 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, | |
405 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
406 | return 0; | |
407 | } | |
408 | *outl = 0; | |
409 | return 1; | |
410 | } | |
411 | ||
412 | n = b - bl; | |
413 | for (i = bl; i < b; i++) | |
414 | ctx->buf[i] = n; | |
415 | ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b); | |
416 | ||
417 | if (ret) | |
418 | *outl = b; | |
419 | ||
420 | return ret; | |
421 | } | |
422 | ||
423 | int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, | |
424 | const unsigned char *in, int inl) | |
425 | { | |
426 | int fix_len; | |
427 | unsigned int b; | |
428 | ||
429 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
430 | fix_len = ctx->cipher->do_cipher(ctx, out, in, inl); | |
431 | if (fix_len < 0) { | |
432 | *outl = 0; | |
433 | return 0; | |
434 | } else | |
435 | *outl = fix_len; | |
436 | return 1; | |
437 | } | |
438 | ||
439 | if (inl <= 0) { | |
440 | *outl = 0; | |
441 | return inl == 0; | |
442 | } | |
443 | ||
444 | if (ctx->flags & EVP_CIPH_NO_PADDING) | |
445 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
446 | ||
447 | b = ctx->cipher->block_size; | |
448 | OPENSSL_assert(b <= sizeof ctx->final); | |
449 | ||
450 | if (ctx->final_used) { | |
451 | memcpy(out, ctx->final, b); | |
452 | out += b; | |
453 | fix_len = 1; | |
454 | } else | |
455 | fix_len = 0; | |
456 | ||
457 | if (!EVP_EncryptUpdate(ctx, out, outl, in, inl)) | |
458 | return 0; | |
459 | ||
460 | /* | |
461 | * if we have 'decrypted' a multiple of block size, make sure we have a | |
462 | * copy of this last block | |
463 | */ | |
464 | if (b > 1 && !ctx->buf_len) { | |
465 | *outl -= b; | |
466 | ctx->final_used = 1; | |
467 | memcpy(ctx->final, &out[*outl], b); | |
468 | } else | |
469 | ctx->final_used = 0; | |
470 | ||
471 | if (fix_len) | |
472 | *outl += b; | |
473 | ||
474 | return 1; | |
475 | } | |
476 | ||
477 | int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
478 | { | |
479 | int ret; | |
480 | ret = EVP_DecryptFinal_ex(ctx, out, outl); | |
481 | return ret; | |
482 | } | |
483 | ||
484 | int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
485 | { | |
486 | int i, n; | |
487 | unsigned int b; | |
488 | *outl = 0; | |
489 | ||
490 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
491 | i = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
492 | if (i < 0) | |
493 | return 0; | |
494 | else | |
495 | *outl = i; | |
496 | return 1; | |
497 | } | |
498 | ||
499 | b = ctx->cipher->block_size; | |
500 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
501 | if (ctx->buf_len) { | |
502 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, | |
503 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
504 | return 0; | |
505 | } | |
506 | *outl = 0; | |
507 | return 1; | |
508 | } | |
509 | if (b > 1) { | |
510 | if (ctx->buf_len || !ctx->final_used) { | |
511 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH); | |
512 | return (0); | |
513 | } | |
514 | OPENSSL_assert(b <= sizeof ctx->final); | |
515 | ||
516 | /* | |
517 | * The following assumes that the ciphertext has been authenticated. | |
518 | * Otherwise it provides a padding oracle. | |
519 | */ | |
520 | n = ctx->final[b - 1]; | |
521 | if (n == 0 || n > (int)b) { | |
522 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
523 | return (0); | |
524 | } | |
525 | for (i = 0; i < n; i++) { | |
526 | if (ctx->final[--b] != n) { | |
527 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
528 | return (0); | |
529 | } | |
530 | } | |
531 | n = ctx->cipher->block_size - n; | |
532 | for (i = 0; i < n; i++) | |
533 | out[i] = ctx->final[i]; | |
534 | *outl = n; | |
535 | } else | |
536 | *outl = 0; | |
537 | return (1); | |
538 | } | |
539 | ||
540 | int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) | |
541 | { | |
542 | if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) | |
543 | return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); | |
544 | if (c->key_len == keylen) | |
545 | return 1; | |
546 | if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) { | |
547 | c->key_len = keylen; | |
548 | return 1; | |
549 | } | |
550 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH); | |
551 | return 0; | |
552 | } | |
553 | ||
554 | int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) | |
555 | { | |
556 | if (pad) | |
557 | ctx->flags &= ~EVP_CIPH_NO_PADDING; | |
558 | else | |
559 | ctx->flags |= EVP_CIPH_NO_PADDING; | |
560 | return 1; | |
561 | } | |
562 | ||
563 | int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) | |
564 | { | |
565 | int ret; | |
566 | if (!ctx->cipher) { | |
567 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); | |
568 | return 0; | |
569 | } | |
570 | ||
571 | if (!ctx->cipher->ctrl) { | |
572 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); | |
573 | return 0; | |
574 | } | |
575 | ||
576 | ret = ctx->cipher->ctrl(ctx, type, arg, ptr); | |
577 | if (ret == -1) { | |
578 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, | |
579 | EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); | |
580 | return 0; | |
581 | } | |
582 | return ret; | |
583 | } | |
584 | ||
585 | int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) | |
586 | { | |
587 | if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) | |
588 | return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); | |
589 | if (RAND_bytes(key, ctx->key_len) <= 0) | |
590 | return 0; | |
591 | return 1; | |
592 | } | |
593 | ||
594 | int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) | |
595 | { | |
596 | if ((in == NULL) || (in->cipher == NULL)) { | |
597 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED); | |
598 | return 0; | |
599 | } | |
600 | #ifndef OPENSSL_NO_ENGINE | |
601 | /* Make sure it's safe to copy a cipher context using an ENGINE */ | |
602 | if (in->engine && !ENGINE_init(in->engine)) { | |
603 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB); | |
604 | return 0; | |
605 | } | |
606 | #endif | |
607 | ||
608 | EVP_CIPHER_CTX_reset(out); | |
609 | memcpy(out, in, sizeof(*out)); | |
610 | ||
611 | if (in->cipher_data && in->cipher->ctx_size) { | |
612 | out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size); | |
613 | if (out->cipher_data == NULL) { | |
614 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE); | |
615 | return 0; | |
616 | } | |
617 | memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size); | |
618 | } | |
619 | ||
620 | if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) | |
621 | return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out); | |
622 | return 1; | |
623 | } |