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