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