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Commit | Line | Data |
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62867571 RS |
1 | /* |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. | |
d02b48c6 | 3 | * |
62867571 RS |
4 | * Licensed under the OpenSSL license (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 | |
d02b48c6 RE |
8 | */ |
9 | ||
10 | #include <stdio.h> | |
c3a73daf | 11 | #include <assert.h> |
b39fc560 | 12 | #include "internal/cryptlib.h" |
ec577822 | 13 | #include <openssl/evp.h> |
7f060601 | 14 | #include <openssl/err.h> |
3a87a9b9 | 15 | #include <openssl/rand.h> |
3c27208f | 16 | #include <openssl/engine.h> |
135727ab | 17 | #include "internal/evp_int.h" |
57ae2e24 | 18 | #include "evp_locl.h" |
d02b48c6 | 19 | |
8baf9968 | 20 | int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *c) |
0f113f3e | 21 | { |
8baf9968 RL |
22 | if (c == NULL) |
23 | return 1; | |
24 | if (c->cipher != NULL) { | |
25 | if (c->cipher->cleanup && !c->cipher->cleanup(c)) | |
26 | return 0; | |
27 | /* Cleanse cipher context data */ | |
28 | if (c->cipher_data && c->cipher->ctx_size) | |
29 | OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); | |
30 | } | |
31 | OPENSSL_free(c->cipher_data); | |
32 | #ifndef OPENSSL_NO_ENGINE | |
7c96dbcd | 33 | ENGINE_finish(c->engine); |
8baf9968 RL |
34 | #endif |
35 | memset(c, 0, sizeof(*c)); | |
36 | return 1; | |
0f113f3e | 37 | } |
d02b48c6 | 38 | |
b40228a6 | 39 | EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) |
0f113f3e | 40 | { |
8baf9968 RL |
41 | return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX)); |
42 | } | |
43 | ||
44 | void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) | |
45 | { | |
46 | EVP_CIPHER_CTX_reset(ctx); | |
47 | OPENSSL_free(ctx); | |
0f113f3e | 48 | } |
581f1c84 | 49 | |
360370d9 | 50 | int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
51 | const unsigned char *key, const unsigned char *iv, int enc) |
52 | { | |
c0ca39bd | 53 | EVP_CIPHER_CTX_reset(ctx); |
0f113f3e MC |
54 | return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc); |
55 | } | |
56 | ||
57 | int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, | |
58 | ENGINE *impl, const unsigned char *key, | |
59 | const unsigned char *iv, int enc) | |
60 | { | |
61 | if (enc == -1) | |
62 | enc = ctx->encrypt; | |
63 | else { | |
64 | if (enc) | |
65 | enc = 1; | |
66 | ctx->encrypt = enc; | |
67 | } | |
0b13e9f0 | 68 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
69 | /* |
70 | * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so | |
71 | * this context may already have an ENGINE! Try to avoid releasing the | |
72 | * previous handle, re-querying for an ENGINE, and having a | |
0d4fb843 | 73 | * reinitialisation, when it may all be unnecessary. |
0f113f3e | 74 | */ |
f6b94279 | 75 | if (ctx->engine && ctx->cipher |
a7f9e0a4 | 76 | && (cipher == NULL || cipher->nid == ctx->cipher->nid)) |
0f113f3e | 77 | goto skip_to_init; |
0b13e9f0 | 78 | #endif |
0f113f3e MC |
79 | if (cipher) { |
80 | /* | |
81 | * Ensure a context left lying around from last time is cleared (the | |
82 | * previous check attempted to avoid this if the same ENGINE and | |
83 | * EVP_CIPHER could be used). | |
84 | */ | |
85 | if (ctx->cipher) { | |
86 | unsigned long flags = ctx->flags; | |
c0ca39bd | 87 | EVP_CIPHER_CTX_reset(ctx); |
0f113f3e MC |
88 | /* Restore encrypt and flags */ |
89 | ctx->encrypt = enc; | |
90 | ctx->flags = flags; | |
91 | } | |
0b13e9f0 | 92 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
93 | if (impl) { |
94 | if (!ENGINE_init(impl)) { | |
95 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
96 | return 0; | |
97 | } | |
98 | } else | |
99 | /* Ask if an ENGINE is reserved for this job */ | |
100 | impl = ENGINE_get_cipher_engine(cipher->nid); | |
101 | if (impl) { | |
102 | /* There's an ENGINE for this job ... (apparently) */ | |
103 | const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid); | |
104 | if (!c) { | |
105 | /* | |
106 | * One positive side-effect of US's export control history, | |
107 | * is that we should at least be able to avoid using US | |
0d4fb843 | 108 | * misspellings of "initialisation"? |
0f113f3e MC |
109 | */ |
110 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
111 | return 0; | |
112 | } | |
113 | /* We'll use the ENGINE's private cipher definition */ | |
114 | cipher = c; | |
115 | /* | |
116 | * Store the ENGINE functional reference so we know 'cipher' came | |
117 | * from an ENGINE and we need to release it when done. | |
118 | */ | |
119 | ctx->engine = impl; | |
120 | } else | |
121 | ctx->engine = NULL; | |
0b13e9f0 | 122 | #endif |
544a2aea | 123 | |
0f113f3e MC |
124 | ctx->cipher = cipher; |
125 | if (ctx->cipher->ctx_size) { | |
b51bce94 | 126 | ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size); |
90945fa3 | 127 | if (ctx->cipher_data == NULL) { |
0f113f3e MC |
128 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); |
129 | return 0; | |
130 | } | |
131 | } else { | |
132 | ctx->cipher_data = NULL; | |
133 | } | |
134 | ctx->key_len = cipher->key_len; | |
135 | /* Preserve wrap enable flag, zero everything else */ | |
136 | ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW; | |
137 | if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { | |
138 | if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { | |
139 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
140 | return 0; | |
141 | } | |
142 | } | |
143 | } else if (!ctx->cipher) { | |
144 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); | |
145 | return 0; | |
146 | } | |
0b13e9f0 | 147 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e | 148 | skip_to_init: |
0b13e9f0 | 149 | #endif |
0f113f3e MC |
150 | /* we assume block size is a power of 2 in *cryptUpdate */ |
151 | OPENSSL_assert(ctx->cipher->block_size == 1 | |
152 | || ctx->cipher->block_size == 8 | |
153 | || ctx->cipher->block_size == 16); | |
154 | ||
155 | if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW) | |
156 | && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) { | |
157 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED); | |
158 | return 0; | |
159 | } | |
160 | ||
480d3323 | 161 | if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) { |
0f113f3e MC |
162 | switch (EVP_CIPHER_CTX_mode(ctx)) { |
163 | ||
164 | case EVP_CIPH_STREAM_CIPHER: | |
165 | case EVP_CIPH_ECB_MODE: | |
166 | break; | |
167 | ||
168 | case EVP_CIPH_CFB_MODE: | |
169 | case EVP_CIPH_OFB_MODE: | |
170 | ||
171 | ctx->num = 0; | |
172 | /* fall-through */ | |
173 | ||
174 | case EVP_CIPH_CBC_MODE: | |
175 | ||
176 | OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= | |
177 | (int)sizeof(ctx->iv)); | |
178 | if (iv) | |
179 | memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
180 | memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); | |
181 | break; | |
182 | ||
183 | case EVP_CIPH_CTR_MODE: | |
184 | ctx->num = 0; | |
185 | /* Don't reuse IV for CTR mode */ | |
186 | if (iv) | |
187 | memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
188 | break; | |
189 | ||
190 | default: | |
191 | return 0; | |
0f113f3e MC |
192 | } |
193 | } | |
194 | ||
195 | if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { | |
196 | if (!ctx->cipher->init(ctx, key, iv, enc)) | |
197 | return 0; | |
198 | } | |
199 | ctx->buf_len = 0; | |
200 | ctx->final_used = 0; | |
201 | ctx->block_mask = ctx->cipher->block_size - 1; | |
202 | return 1; | |
203 | } | |
d02b48c6 | 204 | |
be06a934 | 205 | int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
206 | const unsigned char *in, int inl) |
207 | { | |
208 | if (ctx->encrypt) | |
209 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
210 | else | |
211 | return EVP_DecryptUpdate(ctx, out, outl, in, inl); | |
212 | } | |
d02b48c6 | 213 | |
581f1c84 | 214 | int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
215 | { |
216 | if (ctx->encrypt) | |
217 | return EVP_EncryptFinal_ex(ctx, out, outl); | |
218 | else | |
219 | return EVP_DecryptFinal_ex(ctx, out, outl); | |
220 | } | |
581f1c84 | 221 | |
6b691a5c | 222 | int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
223 | { |
224 | if (ctx->encrypt) | |
225 | return EVP_EncryptFinal(ctx, out, outl); | |
226 | else | |
227 | return EVP_DecryptFinal(ctx, out, outl); | |
228 | } | |
d02b48c6 | 229 | |
be06a934 | 230 | int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
231 | const unsigned char *key, const unsigned char *iv) |
232 | { | |
233 | return EVP_CipherInit(ctx, cipher, key, iv, 1); | |
234 | } | |
18eda732 | 235 | |
0f113f3e MC |
236 | int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
237 | ENGINE *impl, const unsigned char *key, | |
238 | const unsigned char *iv) | |
239 | { | |
240 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); | |
241 | } | |
d02b48c6 | 242 | |
be06a934 | 243 | int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
244 | const unsigned char *key, const unsigned char *iv) |
245 | { | |
246 | return EVP_CipherInit(ctx, cipher, key, iv, 0); | |
247 | } | |
18eda732 | 248 | |
0f113f3e MC |
249 | int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
250 | ENGINE *impl, const unsigned char *key, | |
251 | const unsigned char *iv) | |
252 | { | |
253 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); | |
254 | } | |
d02b48c6 | 255 | |
c3a73daf AP |
256 | /* |
257 | * According to the letter of standard difference between pointers | |
258 | * is specified to be valid only within same object. This makes | |
259 | * it formally challenging to determine if input and output buffers | |
260 | * are not partially overlapping with standard pointer arithmetic. | |
261 | */ | |
262 | #ifdef PTRDIFF_T | |
263 | # undef PTRDIFF_T | |
264 | #endif | |
265 | #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64 | |
266 | /* | |
267 | * Then we have VMS that distinguishes itself by adhering to | |
268 | * sizeof(size_t)==4 even in 64-bit builds... | |
269 | */ | |
270 | # define PTRDIFF_T uint64_t | |
271 | #else | |
272 | # define PTRDIFF_T size_t | |
273 | #endif | |
274 | ||
275 | static int is_partially_overlapping(const void *ptr1, const void *ptr2, | |
276 | int len) | |
277 | { | |
278 | PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2; | |
279 | /* | |
280 | * Check for partially overlapping buffers. [Binary logical | |
281 | * operations are used instead of boolean to minimize number | |
282 | * of conditional branches.] | |
283 | */ | |
284 | int condition = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) | | |
285 | (diff > (0 - (PTRDIFF_T)len))); | |
286 | assert(!condition); | |
287 | return condition; | |
288 | } | |
289 | ||
be06a934 | 290 | int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
291 | const unsigned char *in, int inl) |
292 | { | |
293 | int i, j, bl; | |
294 | ||
c3a73daf AP |
295 | if (is_partially_overlapping(out, in, inl)) |
296 | return 0; | |
297 | ||
0f113f3e MC |
298 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
299 | i = ctx->cipher->do_cipher(ctx, out, in, inl); | |
300 | if (i < 0) | |
301 | return 0; | |
302 | else | |
303 | *outl = i; | |
304 | return 1; | |
305 | } | |
306 | ||
307 | if (inl <= 0) { | |
308 | *outl = 0; | |
309 | return inl == 0; | |
310 | } | |
311 | ||
312 | if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) { | |
313 | if (ctx->cipher->do_cipher(ctx, out, in, inl)) { | |
314 | *outl = inl; | |
315 | return 1; | |
316 | } else { | |
317 | *outl = 0; | |
318 | return 0; | |
319 | } | |
320 | } | |
321 | i = ctx->buf_len; | |
322 | bl = ctx->cipher->block_size; | |
323 | OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); | |
324 | if (i != 0) { | |
3f358213 | 325 | if (bl - i > inl) { |
0f113f3e MC |
326 | memcpy(&(ctx->buf[i]), in, inl); |
327 | ctx->buf_len += inl; | |
328 | *outl = 0; | |
329 | return 1; | |
330 | } else { | |
331 | j = bl - i; | |
332 | memcpy(&(ctx->buf[i]), in, j); | |
333 | if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl)) | |
334 | return 0; | |
335 | inl -= j; | |
336 | in += j; | |
337 | out += bl; | |
338 | *outl = bl; | |
339 | } | |
340 | } else | |
341 | *outl = 0; | |
342 | i = inl & (bl - 1); | |
343 | inl -= i; | |
344 | if (inl > 0) { | |
345 | if (!ctx->cipher->do_cipher(ctx, out, in, inl)) | |
346 | return 0; | |
347 | *outl += inl; | |
348 | } | |
349 | ||
350 | if (i != 0) | |
351 | memcpy(ctx->buf, &(in[inl]), i); | |
352 | ctx->buf_len = i; | |
353 | return 1; | |
354 | } | |
d02b48c6 | 355 | |
be06a934 | 356 | int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
357 | { |
358 | int ret; | |
359 | ret = EVP_EncryptFinal_ex(ctx, out, outl); | |
360 | return ret; | |
361 | } | |
581f1c84 DSH |
362 | |
363 | int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
0f113f3e MC |
364 | { |
365 | int n, ret; | |
366 | unsigned int i, b, bl; | |
367 | ||
368 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
369 | ret = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
370 | if (ret < 0) | |
371 | return 0; | |
372 | else | |
373 | *outl = ret; | |
374 | return 1; | |
375 | } | |
376 | ||
377 | b = ctx->cipher->block_size; | |
378 | OPENSSL_assert(b <= sizeof ctx->buf); | |
379 | if (b == 1) { | |
380 | *outl = 0; | |
381 | return 1; | |
382 | } | |
383 | bl = ctx->buf_len; | |
384 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
385 | if (bl) { | |
386 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, | |
387 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
388 | return 0; | |
389 | } | |
390 | *outl = 0; | |
391 | return 1; | |
392 | } | |
393 | ||
394 | n = b - bl; | |
395 | for (i = bl; i < b; i++) | |
396 | ctx->buf[i] = n; | |
397 | ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b); | |
398 | ||
399 | if (ret) | |
400 | *outl = b; | |
401 | ||
402 | return ret; | |
403 | } | |
d02b48c6 | 404 | |
be06a934 | 405 | int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
406 | const unsigned char *in, int inl) |
407 | { | |
408 | int fix_len; | |
409 | unsigned int b; | |
410 | ||
c3a73daf AP |
411 | if (is_partially_overlapping(out, in, inl)) |
412 | return 0; | |
413 | ||
0f113f3e MC |
414 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
415 | fix_len = ctx->cipher->do_cipher(ctx, out, in, inl); | |
416 | if (fix_len < 0) { | |
417 | *outl = 0; | |
418 | return 0; | |
419 | } else | |
420 | *outl = fix_len; | |
421 | return 1; | |
422 | } | |
423 | ||
424 | if (inl <= 0) { | |
425 | *outl = 0; | |
426 | return inl == 0; | |
427 | } | |
428 | ||
429 | if (ctx->flags & EVP_CIPH_NO_PADDING) | |
430 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
431 | ||
432 | b = ctx->cipher->block_size; | |
433 | OPENSSL_assert(b <= sizeof ctx->final); | |
434 | ||
435 | if (ctx->final_used) { | |
436 | memcpy(out, ctx->final, b); | |
437 | out += b; | |
438 | fix_len = 1; | |
439 | } else | |
440 | fix_len = 0; | |
441 | ||
442 | if (!EVP_EncryptUpdate(ctx, out, outl, in, inl)) | |
443 | return 0; | |
444 | ||
445 | /* | |
446 | * if we have 'decrypted' a multiple of block size, make sure we have a | |
447 | * copy of this last block | |
448 | */ | |
449 | if (b > 1 && !ctx->buf_len) { | |
450 | *outl -= b; | |
451 | ctx->final_used = 1; | |
452 | memcpy(ctx->final, &out[*outl], b); | |
453 | } else | |
454 | ctx->final_used = 0; | |
455 | ||
456 | if (fix_len) | |
457 | *outl += b; | |
458 | ||
459 | return 1; | |
460 | } | |
d02b48c6 | 461 | |
6b691a5c | 462 | int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
463 | { |
464 | int ret; | |
465 | ret = EVP_DecryptFinal_ex(ctx, out, outl); | |
466 | return ret; | |
467 | } | |
581f1c84 DSH |
468 | |
469 | int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
0f113f3e MC |
470 | { |
471 | int i, n; | |
472 | unsigned int b; | |
473 | *outl = 0; | |
474 | ||
475 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
476 | i = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
477 | if (i < 0) | |
478 | return 0; | |
479 | else | |
480 | *outl = i; | |
481 | return 1; | |
482 | } | |
483 | ||
484 | b = ctx->cipher->block_size; | |
485 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
486 | if (ctx->buf_len) { | |
487 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, | |
488 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
489 | return 0; | |
490 | } | |
491 | *outl = 0; | |
492 | return 1; | |
493 | } | |
494 | if (b > 1) { | |
495 | if (ctx->buf_len || !ctx->final_used) { | |
496 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH); | |
497 | return (0); | |
498 | } | |
499 | OPENSSL_assert(b <= sizeof ctx->final); | |
500 | ||
501 | /* | |
502 | * The following assumes that the ciphertext has been authenticated. | |
503 | * Otherwise it provides a padding oracle. | |
504 | */ | |
505 | n = ctx->final[b - 1]; | |
506 | if (n == 0 || n > (int)b) { | |
507 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
508 | return (0); | |
509 | } | |
510 | for (i = 0; i < n; i++) { | |
511 | if (ctx->final[--b] != n) { | |
512 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
513 | return (0); | |
514 | } | |
515 | } | |
516 | n = ctx->cipher->block_size - n; | |
517 | for (i = 0; i < n; i++) | |
518 | out[i] = ctx->final[i]; | |
519 | *outl = n; | |
520 | } else | |
521 | *outl = 0; | |
522 | return (1); | |
523 | } | |
d02b48c6 | 524 | |
6343829a | 525 | int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) |
0f113f3e MC |
526 | { |
527 | if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) | |
528 | return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); | |
529 | if (c->key_len == keylen) | |
530 | return 1; | |
531 | if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) { | |
532 | c->key_len = keylen; | |
533 | return 1; | |
534 | } | |
535 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH); | |
536 | return 0; | |
537 | } | |
49528751 | 538 | |
f2e5ca84 | 539 | int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) |
0f113f3e MC |
540 | { |
541 | if (pad) | |
542 | ctx->flags &= ~EVP_CIPH_NO_PADDING; | |
543 | else | |
544 | ctx->flags |= EVP_CIPH_NO_PADDING; | |
545 | return 1; | |
546 | } | |
f2e5ca84 | 547 | |
49528751 DSH |
548 | int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) |
549 | { | |
0f113f3e MC |
550 | int ret; |
551 | if (!ctx->cipher) { | |
552 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); | |
553 | return 0; | |
554 | } | |
555 | ||
556 | if (!ctx->cipher->ctrl) { | |
557 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); | |
558 | return 0; | |
559 | } | |
560 | ||
561 | ret = ctx->cipher->ctrl(ctx, type, arg, ptr); | |
562 | if (ret == -1) { | |
563 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, | |
564 | EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); | |
565 | return 0; | |
566 | } | |
567 | return ret; | |
49528751 | 568 | } |
216659eb DSH |
569 | |
570 | int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) | |
0f113f3e MC |
571 | { |
572 | if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) | |
573 | return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); | |
574 | if (RAND_bytes(key, ctx->key_len) <= 0) | |
575 | return 0; | |
576 | return 1; | |
577 | } | |
216659eb | 578 | |
c2bf7208 | 579 | int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) |
0f113f3e MC |
580 | { |
581 | if ((in == NULL) || (in->cipher == NULL)) { | |
582 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED); | |
583 | return 0; | |
584 | } | |
c2bf7208 | 585 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
586 | /* Make sure it's safe to copy a cipher context using an ENGINE */ |
587 | if (in->engine && !ENGINE_init(in->engine)) { | |
588 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB); | |
589 | return 0; | |
590 | } | |
c2bf7208 DSH |
591 | #endif |
592 | ||
c0ca39bd | 593 | EVP_CIPHER_CTX_reset(out); |
b4faea50 | 594 | memcpy(out, in, sizeof(*out)); |
0f113f3e MC |
595 | |
596 | if (in->cipher_data && in->cipher->ctx_size) { | |
597 | out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size); | |
90945fa3 | 598 | if (out->cipher_data == NULL) { |
0f113f3e MC |
599 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE); |
600 | return 0; | |
601 | } | |
602 | memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size); | |
603 | } | |
604 | ||
605 | if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) | |
606 | return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out); | |
607 | return 1; | |
608 | } |