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1 | /* | |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. | |
3 | * | |
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 | |
8 | */ | |
9 | ||
10 | #include <stdio.h> | |
11 | #include <assert.h> | |
12 | #include "internal/cryptlib.h" | |
13 | #include <openssl/evp.h> | |
14 | #include <openssl/err.h> | |
15 | #include <openssl/rand.h> | |
16 | #include <openssl/engine.h> | |
17 | #include "internal/evp_int.h" | |
18 | #include "evp_locl.h" | |
19 | ||
20 | int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *c) | |
21 | { | |
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 | |
33 | ENGINE_finish(c->engine); | |
34 | #endif | |
35 | memset(c, 0, sizeof(*c)); | |
36 | return 1; | |
37 | } | |
38 | ||
39 | EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) | |
40 | { | |
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); | |
48 | } | |
49 | ||
50 | int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, | |
51 | const unsigned char *key, const unsigned char *iv, int enc) | |
52 | { | |
53 | EVP_CIPHER_CTX_reset(ctx); | |
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 | } | |
68 | #ifndef OPENSSL_NO_ENGINE | |
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 | |
73 | * reinitialisation, when it may all be unnecessary. | |
74 | */ | |
75 | if (ctx->engine && ctx->cipher | |
76 | && (cipher == NULL || cipher->nid == ctx->cipher->nid)) | |
77 | goto skip_to_init; | |
78 | #endif | |
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; | |
87 | EVP_CIPHER_CTX_reset(ctx); | |
88 | /* Restore encrypt and flags */ | |
89 | ctx->encrypt = enc; | |
90 | ctx->flags = flags; | |
91 | } | |
92 | #ifndef OPENSSL_NO_ENGINE | |
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 | |
108 | * misspellings of "initialisation"? | |
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; | |
122 | #endif | |
123 | ||
124 | ctx->cipher = cipher; | |
125 | if (ctx->cipher->ctx_size) { | |
126 | ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size); | |
127 | if (ctx->cipher_data == NULL) { | |
128 | ctx->cipher = NULL; | |
129 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); | |
130 | return 0; | |
131 | } | |
132 | } else { | |
133 | ctx->cipher_data = NULL; | |
134 | } | |
135 | ctx->key_len = cipher->key_len; | |
136 | /* Preserve wrap enable flag, zero everything else */ | |
137 | ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW; | |
138 | if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { | |
139 | if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { | |
140 | ctx->cipher = NULL; | |
141 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
142 | return 0; | |
143 | } | |
144 | } | |
145 | } else if (!ctx->cipher) { | |
146 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); | |
147 | return 0; | |
148 | } | |
149 | #ifndef OPENSSL_NO_ENGINE | |
150 | skip_to_init: | |
151 | #endif | |
152 | /* we assume block size is a power of 2 in *cryptUpdate */ | |
153 | OPENSSL_assert(ctx->cipher->block_size == 1 | |
154 | || ctx->cipher->block_size == 8 | |
155 | || ctx->cipher->block_size == 16); | |
156 | ||
157 | if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW) | |
158 | && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) { | |
159 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED); | |
160 | return 0; | |
161 | } | |
162 | ||
163 | if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) { | |
164 | switch (EVP_CIPHER_CTX_mode(ctx)) { | |
165 | ||
166 | case EVP_CIPH_STREAM_CIPHER: | |
167 | case EVP_CIPH_ECB_MODE: | |
168 | break; | |
169 | ||
170 | case EVP_CIPH_CFB_MODE: | |
171 | case EVP_CIPH_OFB_MODE: | |
172 | ||
173 | ctx->num = 0; | |
174 | /* fall-through */ | |
175 | ||
176 | case EVP_CIPH_CBC_MODE: | |
177 | ||
178 | OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= | |
179 | (int)sizeof(ctx->iv)); | |
180 | if (iv) | |
181 | memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
182 | memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); | |
183 | break; | |
184 | ||
185 | case EVP_CIPH_CTR_MODE: | |
186 | ctx->num = 0; | |
187 | /* Don't reuse IV for CTR mode */ | |
188 | if (iv) | |
189 | memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
190 | break; | |
191 | ||
192 | default: | |
193 | return 0; | |
194 | } | |
195 | } | |
196 | ||
197 | if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { | |
198 | if (!ctx->cipher->init(ctx, key, iv, enc)) | |
199 | return 0; | |
200 | } | |
201 | ctx->buf_len = 0; | |
202 | ctx->final_used = 0; | |
203 | ctx->block_mask = ctx->cipher->block_size - 1; | |
204 | return 1; | |
205 | } | |
206 | ||
207 | int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, | |
208 | const unsigned char *in, int inl) | |
209 | { | |
210 | if (ctx->encrypt) | |
211 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
212 | else | |
213 | return EVP_DecryptUpdate(ctx, out, outl, in, inl); | |
214 | } | |
215 | ||
216 | int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
217 | { | |
218 | if (ctx->encrypt) | |
219 | return EVP_EncryptFinal_ex(ctx, out, outl); | |
220 | else | |
221 | return EVP_DecryptFinal_ex(ctx, out, outl); | |
222 | } | |
223 | ||
224 | int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
225 | { | |
226 | if (ctx->encrypt) | |
227 | return EVP_EncryptFinal(ctx, out, outl); | |
228 | else | |
229 | return EVP_DecryptFinal(ctx, out, outl); | |
230 | } | |
231 | ||
232 | int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, | |
233 | const unsigned char *key, const unsigned char *iv) | |
234 | { | |
235 | return EVP_CipherInit(ctx, cipher, key, iv, 1); | |
236 | } | |
237 | ||
238 | int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, | |
239 | ENGINE *impl, const unsigned char *key, | |
240 | const unsigned char *iv) | |
241 | { | |
242 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); | |
243 | } | |
244 | ||
245 | int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, | |
246 | const unsigned char *key, const unsigned char *iv) | |
247 | { | |
248 | return EVP_CipherInit(ctx, cipher, key, iv, 0); | |
249 | } | |
250 | ||
251 | int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, | |
252 | ENGINE *impl, const unsigned char *key, | |
253 | const unsigned char *iv) | |
254 | { | |
255 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); | |
256 | } | |
257 | ||
258 | /* | |
259 | * According to the letter of standard difference between pointers | |
260 | * is specified to be valid only within same object. This makes | |
261 | * it formally challenging to determine if input and output buffers | |
262 | * are not partially overlapping with standard pointer arithmetic. | |
263 | */ | |
264 | #ifdef PTRDIFF_T | |
265 | # undef PTRDIFF_T | |
266 | #endif | |
267 | #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64 | |
268 | /* | |
269 | * Then we have VMS that distinguishes itself by adhering to | |
270 | * sizeof(size_t)==4 even in 64-bit builds, which means that | |
271 | * difference between two pointers might be truncated to 32 bits. | |
272 | * In the context one can even wonder how comparison for | |
273 | * equality is implemented. To be on the safe side we adhere to | |
274 | * PTRDIFF_T even for comparison for equality. | |
275 | */ | |
276 | # define PTRDIFF_T uint64_t | |
277 | #else | |
278 | # define PTRDIFF_T size_t | |
279 | #endif | |
280 | ||
281 | int is_partially_overlapping(const void *ptr1, const void *ptr2, int len) | |
282 | { | |
283 | PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2; | |
284 | /* | |
285 | * Check for partially overlapping buffers. [Binary logical | |
286 | * operations are used instead of boolean to minimize number | |
287 | * of conditional branches.] | |
288 | */ | |
289 | int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) | | |
290 | (diff > (0 - (PTRDIFF_T)len))); | |
291 | ||
292 | return overlapped; | |
293 | } | |
294 | ||
295 | int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, | |
296 | const unsigned char *in, int inl) | |
297 | { | |
298 | int i, j, bl, cmpl = inl; | |
299 | ||
300 | if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS)) | |
301 | cmpl = (cmpl + 7) / 8; | |
302 | ||
303 | bl = ctx->cipher->block_size; | |
304 | ||
305 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
306 | /* If block size > 1 then the cipher will have to do this check */ | |
307 | if (bl == 1 && is_partially_overlapping(out, in, cmpl)) { | |
308 | EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); | |
309 | return 0; | |
310 | } | |
311 | ||
312 | i = ctx->cipher->do_cipher(ctx, out, in, inl); | |
313 | if (i < 0) | |
314 | return 0; | |
315 | else | |
316 | *outl = i; | |
317 | return 1; | |
318 | } | |
319 | ||
320 | if (inl <= 0) { | |
321 | *outl = 0; | |
322 | return inl == 0; | |
323 | } | |
324 | if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) { | |
325 | EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); | |
326 | return 0; | |
327 | } | |
328 | ||
329 | if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) { | |
330 | if (ctx->cipher->do_cipher(ctx, out, in, inl)) { | |
331 | *outl = inl; | |
332 | return 1; | |
333 | } else { | |
334 | *outl = 0; | |
335 | return 0; | |
336 | } | |
337 | } | |
338 | i = ctx->buf_len; | |
339 | OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); | |
340 | if (i != 0) { | |
341 | if (bl - i > inl) { | |
342 | memcpy(&(ctx->buf[i]), in, inl); | |
343 | ctx->buf_len += inl; | |
344 | *outl = 0; | |
345 | return 1; | |
346 | } else { | |
347 | j = bl - i; | |
348 | memcpy(&(ctx->buf[i]), in, j); | |
349 | inl -= j; | |
350 | in += j; | |
351 | if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl)) | |
352 | return 0; | |
353 | out += bl; | |
354 | *outl = bl; | |
355 | } | |
356 | } else | |
357 | *outl = 0; | |
358 | i = inl & (bl - 1); | |
359 | inl -= i; | |
360 | if (inl > 0) { | |
361 | if (!ctx->cipher->do_cipher(ctx, out, in, inl)) | |
362 | return 0; | |
363 | *outl += inl; | |
364 | } | |
365 | ||
366 | if (i != 0) | |
367 | memcpy(ctx->buf, &(in[inl]), i); | |
368 | ctx->buf_len = i; | |
369 | return 1; | |
370 | } | |
371 | ||
372 | int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
373 | { | |
374 | int ret; | |
375 | ret = EVP_EncryptFinal_ex(ctx, out, outl); | |
376 | return ret; | |
377 | } | |
378 | ||
379 | int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
380 | { | |
381 | int n, ret; | |
382 | unsigned int i, b, bl; | |
383 | ||
384 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
385 | ret = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
386 | if (ret < 0) | |
387 | return 0; | |
388 | else | |
389 | *outl = ret; | |
390 | return 1; | |
391 | } | |
392 | ||
393 | b = ctx->cipher->block_size; | |
394 | OPENSSL_assert(b <= sizeof ctx->buf); | |
395 | if (b == 1) { | |
396 | *outl = 0; | |
397 | return 1; | |
398 | } | |
399 | bl = ctx->buf_len; | |
400 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
401 | if (bl) { | |
402 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, | |
403 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
404 | return 0; | |
405 | } | |
406 | *outl = 0; | |
407 | return 1; | |
408 | } | |
409 | ||
410 | n = b - bl; | |
411 | for (i = bl; i < b; i++) | |
412 | ctx->buf[i] = n; | |
413 | ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b); | |
414 | ||
415 | if (ret) | |
416 | *outl = b; | |
417 | ||
418 | return ret; | |
419 | } | |
420 | ||
421 | int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, | |
422 | const unsigned char *in, int inl) | |
423 | { | |
424 | int fix_len, cmpl = inl; | |
425 | unsigned int b; | |
426 | ||
427 | b = ctx->cipher->block_size; | |
428 | ||
429 | if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS)) | |
430 | cmpl = (cmpl + 7) / 8; | |
431 | ||
432 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
433 | if (b == 1 && is_partially_overlapping(out, in, cmpl)) { | |
434 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); | |
435 | return 0; | |
436 | } | |
437 | ||
438 | fix_len = ctx->cipher->do_cipher(ctx, out, in, inl); | |
439 | if (fix_len < 0) { | |
440 | *outl = 0; | |
441 | return 0; | |
442 | } else | |
443 | *outl = fix_len; | |
444 | return 1; | |
445 | } | |
446 | ||
447 | if (inl <= 0) { | |
448 | *outl = 0; | |
449 | return inl == 0; | |
450 | } | |
451 | ||
452 | if (ctx->flags & EVP_CIPH_NO_PADDING) | |
453 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
454 | ||
455 | OPENSSL_assert(b <= sizeof ctx->final); | |
456 | ||
457 | if (ctx->final_used) { | |
458 | /* see comment about PTRDIFF_T comparison above */ | |
459 | if (((PTRDIFF_T)out == (PTRDIFF_T)in) | |
460 | || is_partially_overlapping(out, in, b)) { | |
461 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); | |
462 | return 0; | |
463 | } | |
464 | memcpy(out, ctx->final, b); | |
465 | out += b; | |
466 | fix_len = 1; | |
467 | } else | |
468 | fix_len = 0; | |
469 | ||
470 | if (!EVP_EncryptUpdate(ctx, out, outl, in, inl)) | |
471 | return 0; | |
472 | ||
473 | /* | |
474 | * if we have 'decrypted' a multiple of block size, make sure we have a | |
475 | * copy of this last block | |
476 | */ | |
477 | if (b > 1 && !ctx->buf_len) { | |
478 | *outl -= b; | |
479 | ctx->final_used = 1; | |
480 | memcpy(ctx->final, &out[*outl], b); | |
481 | } else | |
482 | ctx->final_used = 0; | |
483 | ||
484 | if (fix_len) | |
485 | *outl += b; | |
486 | ||
487 | return 1; | |
488 | } | |
489 | ||
490 | int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
491 | { | |
492 | int ret; | |
493 | ret = EVP_DecryptFinal_ex(ctx, out, outl); | |
494 | return ret; | |
495 | } | |
496 | ||
497 | int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
498 | { | |
499 | int i, n; | |
500 | unsigned int b; | |
501 | *outl = 0; | |
502 | ||
503 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
504 | i = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
505 | if (i < 0) | |
506 | return 0; | |
507 | else | |
508 | *outl = i; | |
509 | return 1; | |
510 | } | |
511 | ||
512 | b = ctx->cipher->block_size; | |
513 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
514 | if (ctx->buf_len) { | |
515 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, | |
516 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
517 | return 0; | |
518 | } | |
519 | *outl = 0; | |
520 | return 1; | |
521 | } | |
522 | if (b > 1) { | |
523 | if (ctx->buf_len || !ctx->final_used) { | |
524 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH); | |
525 | return (0); | |
526 | } | |
527 | OPENSSL_assert(b <= sizeof ctx->final); | |
528 | ||
529 | /* | |
530 | * The following assumes that the ciphertext has been authenticated. | |
531 | * Otherwise it provides a padding oracle. | |
532 | */ | |
533 | n = ctx->final[b - 1]; | |
534 | if (n == 0 || n > (int)b) { | |
535 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
536 | return (0); | |
537 | } | |
538 | for (i = 0; i < n; i++) { | |
539 | if (ctx->final[--b] != n) { | |
540 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
541 | return (0); | |
542 | } | |
543 | } | |
544 | n = ctx->cipher->block_size - n; | |
545 | for (i = 0; i < n; i++) | |
546 | out[i] = ctx->final[i]; | |
547 | *outl = n; | |
548 | } else | |
549 | *outl = 0; | |
550 | return (1); | |
551 | } | |
552 | ||
553 | int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) | |
554 | { | |
555 | if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) | |
556 | return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); | |
557 | if (c->key_len == keylen) | |
558 | return 1; | |
559 | if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) { | |
560 | c->key_len = keylen; | |
561 | return 1; | |
562 | } | |
563 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH); | |
564 | return 0; | |
565 | } | |
566 | ||
567 | int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) | |
568 | { | |
569 | if (pad) | |
570 | ctx->flags &= ~EVP_CIPH_NO_PADDING; | |
571 | else | |
572 | ctx->flags |= EVP_CIPH_NO_PADDING; | |
573 | return 1; | |
574 | } | |
575 | ||
576 | int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) | |
577 | { | |
578 | int ret; | |
579 | if (!ctx->cipher) { | |
580 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); | |
581 | return 0; | |
582 | } | |
583 | ||
584 | if (!ctx->cipher->ctrl) { | |
585 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); | |
586 | return 0; | |
587 | } | |
588 | ||
589 | ret = ctx->cipher->ctrl(ctx, type, arg, ptr); | |
590 | if (ret == -1) { | |
591 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, | |
592 | EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); | |
593 | return 0; | |
594 | } | |
595 | return ret; | |
596 | } | |
597 | ||
598 | int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) | |
599 | { | |
600 | if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) | |
601 | return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); | |
602 | if (RAND_bytes(key, ctx->key_len) <= 0) | |
603 | return 0; | |
604 | return 1; | |
605 | } | |
606 | ||
607 | int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) | |
608 | { | |
609 | if ((in == NULL) || (in->cipher == NULL)) { | |
610 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED); | |
611 | return 0; | |
612 | } | |
613 | #ifndef OPENSSL_NO_ENGINE | |
614 | /* Make sure it's safe to copy a cipher context using an ENGINE */ | |
615 | if (in->engine && !ENGINE_init(in->engine)) { | |
616 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB); | |
617 | return 0; | |
618 | } | |
619 | #endif | |
620 | ||
621 | EVP_CIPHER_CTX_reset(out); | |
622 | memcpy(out, in, sizeof(*out)); | |
623 | ||
624 | if (in->cipher_data && in->cipher->ctx_size) { | |
625 | out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size); | |
626 | if (out->cipher_data == NULL) { | |
627 | out->cipher = NULL; | |
628 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE); | |
629 | return 0; | |
630 | } | |
631 | memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size); | |
632 | } | |
633 | ||
634 | if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) | |
635 | if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) { | |
636 | out->cipher = NULL; | |
637 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR); | |
638 | return 0; | |
639 | } | |
640 | return 1; | |
641 | } |