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Commit | Line | Data |
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62867571 | 1 | /* |
b0edda11 | 2 | * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved. |
d02b48c6 | 3 | * |
4a8b0c55 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
62867571 RS |
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> |
6decf943 | 16 | #include <openssl/rand_drbg.h> |
3c27208f | 17 | #include <openssl/engine.h> |
df05f2ce MC |
18 | #include <openssl/params.h> |
19 | #include <openssl/core_names.h> | |
135727ab | 20 | #include "internal/evp_int.h" |
df05f2ce | 21 | #include "internal/provider.h" |
57ae2e24 | 22 | #include "evp_locl.h" |
d02b48c6 | 23 | |
df05f2ce | 24 | int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *ctx) |
0f113f3e | 25 | { |
df05f2ce | 26 | if (ctx == NULL) |
8baf9968 | 27 | return 1; |
df05f2ce MC |
28 | |
29 | if (ctx->cipher == NULL || ctx->cipher->prov == NULL) | |
30 | goto legacy; | |
31 | ||
32 | if (ctx->provctx != NULL) { | |
33 | if (ctx->cipher->freectx != NULL) | |
34 | ctx->cipher->freectx(ctx->provctx); | |
35 | ctx->provctx = NULL; | |
36 | } | |
37 | if (ctx->fetched_cipher != NULL) | |
38 | EVP_CIPHER_meth_free(ctx->fetched_cipher); | |
39 | memset(ctx, 0, sizeof(*ctx)); | |
40 | ||
41 | return 1; | |
42 | ||
43 | /* TODO(3.0): Remove legacy code below */ | |
44 | legacy: | |
45 | ||
46 | if (ctx->cipher != NULL) { | |
47 | if (ctx->cipher->cleanup && !ctx->cipher->cleanup(ctx)) | |
8baf9968 RL |
48 | return 0; |
49 | /* Cleanse cipher context data */ | |
df05f2ce MC |
50 | if (ctx->cipher_data && ctx->cipher->ctx_size) |
51 | OPENSSL_cleanse(ctx->cipher_data, ctx->cipher->ctx_size); | |
8baf9968 | 52 | } |
df05f2ce | 53 | OPENSSL_free(ctx->cipher_data); |
8baf9968 | 54 | #ifndef OPENSSL_NO_ENGINE |
df05f2ce | 55 | ENGINE_finish(ctx->engine); |
8baf9968 | 56 | #endif |
df05f2ce | 57 | memset(ctx, 0, sizeof(*ctx)); |
8baf9968 | 58 | return 1; |
0f113f3e | 59 | } |
d02b48c6 | 60 | |
b40228a6 | 61 | EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) |
0f113f3e | 62 | { |
8baf9968 RL |
63 | return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX)); |
64 | } | |
65 | ||
66 | void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) | |
67 | { | |
68 | EVP_CIPHER_CTX_reset(ctx); | |
69 | OPENSSL_free(ctx); | |
0f113f3e | 70 | } |
581f1c84 | 71 | |
360370d9 | 72 | int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
73 | const unsigned char *key, const unsigned char *iv, int enc) |
74 | { | |
ffd23209 KR |
75 | if (cipher != NULL) |
76 | EVP_CIPHER_CTX_reset(ctx); | |
0f113f3e MC |
77 | return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc); |
78 | } | |
79 | ||
80 | int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, | |
81 | ENGINE *impl, const unsigned char *key, | |
82 | const unsigned char *iv, int enc) | |
83 | { | |
df05f2ce MC |
84 | EVP_CIPHER *provciph = NULL; |
85 | ENGINE *tmpimpl = NULL; | |
86 | const EVP_CIPHER *tmpcipher; | |
87 | ||
88 | /* | |
89 | * enc == 1 means we are encrypting. | |
90 | * enc == 0 means we are decrypting. | |
91 | * enc == -1 means, use the previously initialised value for encrypt/decrypt | |
92 | */ | |
93 | if (enc == -1) { | |
0f113f3e | 94 | enc = ctx->encrypt; |
df05f2ce | 95 | } else { |
0f113f3e MC |
96 | if (enc) |
97 | enc = 1; | |
98 | ctx->encrypt = enc; | |
99 | } | |
df05f2ce MC |
100 | |
101 | if (cipher == NULL && ctx->cipher == NULL) { | |
102 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); | |
103 | return 0; | |
104 | } | |
105 | ||
106 | /* TODO(3.0): Legacy work around code below. Remove this */ | |
107 | ||
0b13e9f0 | 108 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
109 | /* |
110 | * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so | |
111 | * this context may already have an ENGINE! Try to avoid releasing the | |
112 | * previous handle, re-querying for an ENGINE, and having a | |
0d4fb843 | 113 | * reinitialisation, when it may all be unnecessary. |
0f113f3e | 114 | */ |
f6b94279 | 115 | if (ctx->engine && ctx->cipher |
a7f9e0a4 | 116 | && (cipher == NULL || cipher->nid == ctx->cipher->nid)) |
0f113f3e | 117 | goto skip_to_init; |
df05f2ce MC |
118 | |
119 | if (cipher != NULL && impl == NULL) { | |
120 | /* Ask if an ENGINE is reserved for this job */ | |
121 | tmpimpl = ENGINE_get_cipher_engine(cipher->nid); | |
122 | } | |
0b13e9f0 | 123 | #endif |
df05f2ce MC |
124 | |
125 | /* | |
126 | * If there are engines involved then we should use legacy handling for now. | |
127 | */ | |
128 | if (ctx->engine != NULL | |
129 | || impl != NULL | |
130 | || tmpimpl != NULL) { | |
131 | if (ctx->cipher == ctx->fetched_cipher) | |
132 | ctx->cipher = NULL; | |
133 | EVP_CIPHER_meth_free(ctx->fetched_cipher); | |
134 | ctx->fetched_cipher = NULL; | |
135 | goto legacy; | |
136 | } | |
137 | ||
138 | tmpcipher = (cipher == NULL) ? ctx->cipher : cipher; | |
139 | ||
140 | if (tmpcipher->prov == NULL) { | |
141 | switch(tmpcipher->nid) { | |
aab26e6f | 142 | case NID_aes_256_ecb: |
f4a129bb MC |
143 | case NID_aes_192_ecb: |
144 | case NID_aes_128_ecb: | |
718b133a MC |
145 | case NID_aes_256_cbc: |
146 | case NID_aes_192_cbc: | |
147 | case NID_aes_128_cbc: | |
ed98df51 MC |
148 | case NID_aes_256_ofb128: |
149 | case NID_aes_192_ofb128: | |
150 | case NID_aes_128_ofb128: | |
75dd6d64 MC |
151 | case NID_aes_256_cfb128: |
152 | case NID_aes_192_cfb128: | |
153 | case NID_aes_128_cfb128: | |
154 | case NID_aes_256_cfb1: | |
155 | case NID_aes_192_cfb1: | |
156 | case NID_aes_128_cfb1: | |
157 | case NID_aes_256_cfb8: | |
158 | case NID_aes_192_cfb8: | |
159 | case NID_aes_128_cfb8: | |
819a7ae9 MC |
160 | case NID_aes_256_ctr: |
161 | case NID_aes_192_ctr: | |
162 | case NID_aes_128_ctr: | |
aab26e6f | 163 | break; |
df05f2ce MC |
164 | default: |
165 | goto legacy; | |
166 | } | |
167 | } | |
168 | ||
169 | /* | |
170 | * Ensure a context left lying around from last time is cleared | |
171 | * (legacy code) | |
172 | */ | |
173 | if (cipher != NULL && ctx->cipher != NULL) { | |
174 | OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size); | |
175 | ctx->cipher_data = NULL; | |
176 | } | |
177 | ||
178 | ||
179 | /* TODO(3.0): Start of non-legacy code below */ | |
180 | ||
181 | /* Ensure a context left lying around from last time is cleared */ | |
182 | if (cipher != NULL && ctx->cipher != NULL) { | |
183 | unsigned long flags = ctx->flags; | |
184 | ||
185 | EVP_CIPHER_CTX_reset(ctx); | |
186 | /* Restore encrypt and flags */ | |
187 | ctx->encrypt = enc; | |
188 | ctx->flags = flags; | |
189 | } | |
190 | ||
191 | if (cipher != NULL) | |
192 | ctx->cipher = cipher; | |
193 | else | |
194 | cipher = ctx->cipher; | |
195 | ||
196 | if (cipher->prov == NULL) { | |
197 | provciph = EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), ""); | |
198 | if (provciph == NULL) { | |
199 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
200 | return 0; | |
201 | } | |
202 | cipher = provciph; | |
203 | EVP_CIPHER_meth_free(ctx->fetched_cipher); | |
204 | ctx->fetched_cipher = provciph; | |
205 | } | |
206 | ||
207 | ctx->cipher = cipher; | |
208 | if (ctx->provctx == NULL) { | |
a39eb840 | 209 | ctx->provctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov)); |
df05f2ce MC |
210 | if (ctx->provctx == NULL) { |
211 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
212 | return 0; | |
213 | } | |
214 | } | |
215 | ||
216 | if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) { | |
0f113f3e | 217 | /* |
df05f2ce MC |
218 | * If this ctx was already set up for no padding then we need to tell |
219 | * the new cipher about it. | |
220 | */ | |
221 | if (!EVP_CIPHER_CTX_set_padding(ctx, 0)) | |
222 | return 0; | |
223 | } | |
224 | ||
718b133a MC |
225 | switch (EVP_CIPHER_mode(ctx->cipher)) { |
226 | case EVP_CIPH_CFB_MODE: | |
227 | case EVP_CIPH_OFB_MODE: | |
228 | case EVP_CIPH_CBC_MODE: | |
229 | /* For these modes we remember the original IV for later use */ | |
230 | if (!ossl_assert(EVP_CIPHER_CTX_iv_length(ctx) <= (int)sizeof(ctx->oiv))) { | |
231 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
232 | return 0; | |
233 | } | |
234 | if (iv != NULL) | |
235 | memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
236 | } | |
237 | ||
df05f2ce MC |
238 | if (enc) { |
239 | if (ctx->cipher->einit == NULL) { | |
240 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
241 | return 0; | |
242 | } | |
243 | ||
344cfa34 MC |
244 | return ctx->cipher->einit(ctx->provctx, |
245 | key, | |
33b40a10 MC |
246 | key == NULL ? 0 |
247 | : EVP_CIPHER_CTX_key_length(ctx), | |
344cfa34 | 248 | iv, |
33b40a10 MC |
249 | iv == NULL ? 0 |
250 | : EVP_CIPHER_CTX_iv_length(ctx)); | |
df05f2ce MC |
251 | } |
252 | ||
253 | if (ctx->cipher->dinit == NULL) { | |
254 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
255 | return 0; | |
256 | } | |
257 | ||
344cfa34 MC |
258 | return ctx->cipher->dinit(ctx->provctx, |
259 | key, | |
33b40a10 MC |
260 | key == NULL ? 0 |
261 | : EVP_CIPHER_CTX_key_length(ctx), | |
344cfa34 | 262 | iv, |
33b40a10 MC |
263 | iv == NULL ? 0 |
264 | : EVP_CIPHER_CTX_iv_length(ctx)); | |
df05f2ce MC |
265 | |
266 | /* TODO(3.0): Remove legacy code below */ | |
267 | legacy: | |
268 | ||
269 | if (cipher != NULL) { | |
270 | /* | |
271 | * Ensure a context left lying around from last time is cleared (we | |
272 | * previously attempted to avoid this if the same ENGINE and | |
0f113f3e MC |
273 | * EVP_CIPHER could be used). |
274 | */ | |
275 | if (ctx->cipher) { | |
276 | unsigned long flags = ctx->flags; | |
c0ca39bd | 277 | EVP_CIPHER_CTX_reset(ctx); |
0f113f3e MC |
278 | /* Restore encrypt and flags */ |
279 | ctx->encrypt = enc; | |
280 | ctx->flags = flags; | |
281 | } | |
0b13e9f0 | 282 | #ifndef OPENSSL_NO_ENGINE |
df05f2ce | 283 | if (impl != NULL) { |
0f113f3e MC |
284 | if (!ENGINE_init(impl)) { |
285 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
286 | return 0; | |
287 | } | |
df05f2ce MC |
288 | } else { |
289 | impl = tmpimpl; | |
290 | } | |
291 | if (impl != NULL) { | |
0f113f3e MC |
292 | /* There's an ENGINE for this job ... (apparently) */ |
293 | const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid); | |
df05f2ce MC |
294 | |
295 | if (c == NULL) { | |
0f113f3e MC |
296 | /* |
297 | * One positive side-effect of US's export control history, | |
298 | * is that we should at least be able to avoid using US | |
0d4fb843 | 299 | * misspellings of "initialisation"? |
0f113f3e MC |
300 | */ |
301 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
302 | return 0; | |
303 | } | |
304 | /* We'll use the ENGINE's private cipher definition */ | |
305 | cipher = c; | |
306 | /* | |
307 | * Store the ENGINE functional reference so we know 'cipher' came | |
308 | * from an ENGINE and we need to release it when done. | |
309 | */ | |
310 | ctx->engine = impl; | |
df05f2ce | 311 | } else { |
0f113f3e | 312 | ctx->engine = NULL; |
df05f2ce | 313 | } |
0b13e9f0 | 314 | #endif |
544a2aea | 315 | |
0f113f3e MC |
316 | ctx->cipher = cipher; |
317 | if (ctx->cipher->ctx_size) { | |
b51bce94 | 318 | ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size); |
90945fa3 | 319 | if (ctx->cipher_data == NULL) { |
273a0218 | 320 | ctx->cipher = NULL; |
0f113f3e MC |
321 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); |
322 | return 0; | |
323 | } | |
324 | } else { | |
325 | ctx->cipher_data = NULL; | |
326 | } | |
327 | ctx->key_len = cipher->key_len; | |
328 | /* Preserve wrap enable flag, zero everything else */ | |
329 | ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW; | |
330 | if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { | |
331 | if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { | |
273a0218 | 332 | ctx->cipher = NULL; |
0f113f3e MC |
333 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); |
334 | return 0; | |
335 | } | |
336 | } | |
0f113f3e | 337 | } |
0b13e9f0 | 338 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e | 339 | skip_to_init: |
0b13e9f0 | 340 | #endif |
1702c500 P |
341 | if (ctx->cipher == NULL) |
342 | return 0; | |
343 | ||
0f113f3e MC |
344 | /* we assume block size is a power of 2 in *cryptUpdate */ |
345 | OPENSSL_assert(ctx->cipher->block_size == 1 | |
346 | || ctx->cipher->block_size == 8 | |
347 | || ctx->cipher->block_size == 16); | |
348 | ||
349 | if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW) | |
350 | && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) { | |
351 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED); | |
352 | return 0; | |
353 | } | |
354 | ||
480d3323 | 355 | if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) { |
0f113f3e MC |
356 | switch (EVP_CIPHER_CTX_mode(ctx)) { |
357 | ||
358 | case EVP_CIPH_STREAM_CIPHER: | |
359 | case EVP_CIPH_ECB_MODE: | |
360 | break; | |
361 | ||
362 | case EVP_CIPH_CFB_MODE: | |
363 | case EVP_CIPH_OFB_MODE: | |
364 | ||
365 | ctx->num = 0; | |
366 | /* fall-through */ | |
367 | ||
368 | case EVP_CIPH_CBC_MODE: | |
369 | ||
370 | OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= | |
371 | (int)sizeof(ctx->iv)); | |
372 | if (iv) | |
373 | memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
374 | memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); | |
375 | break; | |
376 | ||
377 | case EVP_CIPH_CTR_MODE: | |
378 | ctx->num = 0; | |
379 | /* Don't reuse IV for CTR mode */ | |
380 | if (iv) | |
381 | memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
382 | break; | |
383 | ||
384 | default: | |
385 | return 0; | |
0f113f3e MC |
386 | } |
387 | } | |
388 | ||
389 | if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { | |
390 | if (!ctx->cipher->init(ctx, key, iv, enc)) | |
391 | return 0; | |
392 | } | |
393 | ctx->buf_len = 0; | |
394 | ctx->final_used = 0; | |
395 | ctx->block_mask = ctx->cipher->block_size - 1; | |
396 | return 1; | |
397 | } | |
d02b48c6 | 398 | |
be06a934 | 399 | int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
400 | const unsigned char *in, int inl) |
401 | { | |
402 | if (ctx->encrypt) | |
403 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
404 | else | |
405 | return EVP_DecryptUpdate(ctx, out, outl, in, inl); | |
406 | } | |
d02b48c6 | 407 | |
581f1c84 | 408 | int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
409 | { |
410 | if (ctx->encrypt) | |
411 | return EVP_EncryptFinal_ex(ctx, out, outl); | |
412 | else | |
413 | return EVP_DecryptFinal_ex(ctx, out, outl); | |
414 | } | |
581f1c84 | 415 | |
6b691a5c | 416 | int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
417 | { |
418 | if (ctx->encrypt) | |
419 | return EVP_EncryptFinal(ctx, out, outl); | |
420 | else | |
421 | return EVP_DecryptFinal(ctx, out, outl); | |
422 | } | |
d02b48c6 | 423 | |
be06a934 | 424 | int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
425 | const unsigned char *key, const unsigned char *iv) |
426 | { | |
427 | return EVP_CipherInit(ctx, cipher, key, iv, 1); | |
428 | } | |
18eda732 | 429 | |
0f113f3e MC |
430 | int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
431 | ENGINE *impl, const unsigned char *key, | |
432 | const unsigned char *iv) | |
433 | { | |
434 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); | |
435 | } | |
d02b48c6 | 436 | |
be06a934 | 437 | int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
438 | const unsigned char *key, const unsigned char *iv) |
439 | { | |
440 | return EVP_CipherInit(ctx, cipher, key, iv, 0); | |
441 | } | |
18eda732 | 442 | |
0f113f3e MC |
443 | int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
444 | ENGINE *impl, const unsigned char *key, | |
445 | const unsigned char *iv) | |
446 | { | |
447 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); | |
448 | } | |
d02b48c6 | 449 | |
c3a73daf AP |
450 | /* |
451 | * According to the letter of standard difference between pointers | |
452 | * is specified to be valid only within same object. This makes | |
453 | * it formally challenging to determine if input and output buffers | |
454 | * are not partially overlapping with standard pointer arithmetic. | |
455 | */ | |
456 | #ifdef PTRDIFF_T | |
457 | # undef PTRDIFF_T | |
458 | #endif | |
459 | #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64 | |
460 | /* | |
461 | * Then we have VMS that distinguishes itself by adhering to | |
5fc77684 AP |
462 | * sizeof(size_t)==4 even in 64-bit builds, which means that |
463 | * difference between two pointers might be truncated to 32 bits. | |
464 | * In the context one can even wonder how comparison for | |
465 | * equality is implemented. To be on the safe side we adhere to | |
466 | * PTRDIFF_T even for comparison for equality. | |
c3a73daf AP |
467 | */ |
468 | # define PTRDIFF_T uint64_t | |
469 | #else | |
470 | # define PTRDIFF_T size_t | |
471 | #endif | |
472 | ||
7141ba31 | 473 | int is_partially_overlapping(const void *ptr1, const void *ptr2, int len) |
c3a73daf AP |
474 | { |
475 | PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2; | |
476 | /* | |
477 | * Check for partially overlapping buffers. [Binary logical | |
478 | * operations are used instead of boolean to minimize number | |
479 | * of conditional branches.] | |
480 | */ | |
83151b73 AP |
481 | int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) | |
482 | (diff > (0 - (PTRDIFF_T)len))); | |
b153f092 | 483 | |
83151b73 | 484 | return overlapped; |
c3a73daf AP |
485 | } |
486 | ||
a8bf2f8f RL |
487 | static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx, |
488 | unsigned char *out, int *outl, | |
489 | const unsigned char *in, int inl) | |
0f113f3e | 490 | { |
64846096 LP |
491 | int i, j, bl, cmpl = inl; |
492 | ||
493 | if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS)) | |
494 | cmpl = (cmpl + 7) / 8; | |
0f113f3e | 495 | |
7141ba31 MC |
496 | bl = ctx->cipher->block_size; |
497 | ||
0f113f3e | 498 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
7141ba31 | 499 | /* If block size > 1 then the cipher will have to do this check */ |
64846096 | 500 | if (bl == 1 && is_partially_overlapping(out, in, cmpl)) { |
a8bf2f8f | 501 | EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); |
5fc77684 | 502 | return 0; |
83151b73 | 503 | } |
5fc77684 | 504 | |
0f113f3e MC |
505 | i = ctx->cipher->do_cipher(ctx, out, in, inl); |
506 | if (i < 0) | |
507 | return 0; | |
508 | else | |
509 | *outl = i; | |
510 | return 1; | |
511 | } | |
512 | ||
2c236894 MC |
513 | if (inl <= 0) { |
514 | *outl = 0; | |
515 | return inl == 0; | |
516 | } | |
64846096 | 517 | if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) { |
a8bf2f8f | 518 | EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); |
5fc77684 | 519 | return 0; |
83151b73 | 520 | } |
0f113f3e MC |
521 | |
522 | if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) { | |
523 | if (ctx->cipher->do_cipher(ctx, out, in, inl)) { | |
524 | *outl = inl; | |
525 | return 1; | |
526 | } else { | |
527 | *outl = 0; | |
528 | return 0; | |
529 | } | |
530 | } | |
531 | i = ctx->buf_len; | |
0f113f3e MC |
532 | OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); |
533 | if (i != 0) { | |
3f358213 | 534 | if (bl - i > inl) { |
0f113f3e MC |
535 | memcpy(&(ctx->buf[i]), in, inl); |
536 | ctx->buf_len += inl; | |
537 | *outl = 0; | |
538 | return 1; | |
539 | } else { | |
540 | j = bl - i; | |
541 | memcpy(&(ctx->buf[i]), in, j); | |
0f113f3e MC |
542 | inl -= j; |
543 | in += j; | |
5fc77684 AP |
544 | if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl)) |
545 | return 0; | |
0f113f3e MC |
546 | out += bl; |
547 | *outl = bl; | |
548 | } | |
549 | } else | |
550 | *outl = 0; | |
551 | i = inl & (bl - 1); | |
552 | inl -= i; | |
553 | if (inl > 0) { | |
554 | if (!ctx->cipher->do_cipher(ctx, out, in, inl)) | |
555 | return 0; | |
556 | *outl += inl; | |
557 | } | |
558 | ||
559 | if (i != 0) | |
560 | memcpy(ctx->buf, &(in[inl]), i); | |
561 | ctx->buf_len = i; | |
562 | return 1; | |
563 | } | |
d02b48c6 | 564 | |
a8bf2f8f RL |
565 | |
566 | int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, | |
567 | const unsigned char *in, int inl) | |
568 | { | |
df05f2ce MC |
569 | int ret; |
570 | size_t soutl; | |
3b94944c | 571 | int blocksize; |
df05f2ce | 572 | |
a8bf2f8f RL |
573 | /* Prevent accidental use of decryption context when encrypting */ |
574 | if (!ctx->encrypt) { | |
575 | EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION); | |
576 | return 0; | |
577 | } | |
578 | ||
df05f2ce MC |
579 | if (ctx->cipher == NULL || ctx->cipher->prov == NULL) |
580 | goto legacy; | |
581 | ||
3b94944c MC |
582 | blocksize = EVP_CIPHER_CTX_block_size(ctx); |
583 | ||
584 | if (ctx->cipher->cupdate == NULL || blocksize < 1) { | |
df05f2ce MC |
585 | EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR); |
586 | return 0; | |
587 | } | |
3b94944c MC |
588 | ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl, |
589 | inl + (blocksize == 1 ? 0 : blocksize), in, | |
590 | (size_t)inl); | |
df05f2ce | 591 | |
36e619d7 GV |
592 | if (ret) { |
593 | if (soutl > INT_MAX) { | |
594 | EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR); | |
595 | return 0; | |
596 | } | |
597 | *outl = soutl; | |
df05f2ce | 598 | } |
36e619d7 | 599 | |
df05f2ce MC |
600 | return ret; |
601 | ||
602 | /* TODO(3.0): Remove legacy code below */ | |
603 | legacy: | |
604 | ||
a8bf2f8f RL |
605 | return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl); |
606 | } | |
607 | ||
be06a934 | 608 | int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
609 | { |
610 | int ret; | |
611 | ret = EVP_EncryptFinal_ex(ctx, out, outl); | |
612 | return ret; | |
613 | } | |
581f1c84 DSH |
614 | |
615 | int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
0f113f3e MC |
616 | { |
617 | int n, ret; | |
618 | unsigned int i, b, bl; | |
df05f2ce | 619 | size_t soutl; |
3b94944c | 620 | int blocksize; |
0f113f3e | 621 | |
a8bf2f8f RL |
622 | /* Prevent accidental use of decryption context when encrypting */ |
623 | if (!ctx->encrypt) { | |
624 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION); | |
625 | return 0; | |
626 | } | |
627 | ||
4894dcad P |
628 | if (ctx->cipher == NULL) { |
629 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_NO_CIPHER_SET); | |
630 | return 0; | |
631 | } | |
632 | if (ctx->cipher->prov == NULL) | |
df05f2ce MC |
633 | goto legacy; |
634 | ||
3b94944c MC |
635 | blocksize = EVP_CIPHER_CTX_block_size(ctx); |
636 | ||
637 | if (blocksize < 1 || ctx->cipher->cfinal == NULL) { | |
df05f2ce MC |
638 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR); |
639 | return 0; | |
640 | } | |
641 | ||
3b94944c MC |
642 | ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl, |
643 | blocksize == 1 ? 0 : blocksize); | |
df05f2ce | 644 | |
36e619d7 GV |
645 | if (ret) { |
646 | if (soutl > INT_MAX) { | |
647 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR); | |
648 | return 0; | |
649 | } | |
650 | *outl = soutl; | |
df05f2ce | 651 | } |
df05f2ce MC |
652 | |
653 | return ret; | |
654 | ||
655 | /* TODO(3.0): Remove legacy code below */ | |
656 | legacy: | |
657 | ||
0f113f3e MC |
658 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
659 | ret = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
660 | if (ret < 0) | |
661 | return 0; | |
662 | else | |
663 | *outl = ret; | |
664 | return 1; | |
665 | } | |
666 | ||
667 | b = ctx->cipher->block_size; | |
cbe29648 | 668 | OPENSSL_assert(b <= sizeof(ctx->buf)); |
0f113f3e MC |
669 | if (b == 1) { |
670 | *outl = 0; | |
671 | return 1; | |
672 | } | |
673 | bl = ctx->buf_len; | |
674 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
675 | if (bl) { | |
676 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, | |
677 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
678 | return 0; | |
679 | } | |
680 | *outl = 0; | |
681 | return 1; | |
682 | } | |
683 | ||
684 | n = b - bl; | |
685 | for (i = bl; i < b; i++) | |
686 | ctx->buf[i] = n; | |
687 | ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b); | |
688 | ||
689 | if (ret) | |
690 | *outl = b; | |
691 | ||
692 | return ret; | |
693 | } | |
d02b48c6 | 694 | |
be06a934 | 695 | int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
696 | const unsigned char *in, int inl) |
697 | { | |
df05f2ce | 698 | int fix_len, cmpl = inl, ret; |
0f113f3e | 699 | unsigned int b; |
df05f2ce | 700 | size_t soutl; |
3b94944c | 701 | int blocksize; |
0f113f3e | 702 | |
a8bf2f8f RL |
703 | /* Prevent accidental use of encryption context when decrypting */ |
704 | if (ctx->encrypt) { | |
705 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION); | |
706 | return 0; | |
707 | } | |
708 | ||
d2c2e49e P |
709 | if (ctx->cipher == NULL) { |
710 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_NO_CIPHER_SET); | |
711 | return 0; | |
712 | } | |
713 | if (ctx->cipher->prov == NULL) | |
df05f2ce MC |
714 | goto legacy; |
715 | ||
3b94944c MC |
716 | blocksize = EVP_CIPHER_CTX_block_size(ctx); |
717 | ||
718 | if (ctx->cipher->cupdate == NULL || blocksize < 1) { | |
df05f2ce MC |
719 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR); |
720 | return 0; | |
721 | } | |
3b94944c MC |
722 | ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl, |
723 | inl + (blocksize == 1 ? 0 : blocksize), in, | |
724 | (size_t)inl); | |
df05f2ce MC |
725 | |
726 | if (ret) { | |
727 | if (soutl > INT_MAX) { | |
728 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR); | |
729 | return 0; | |
730 | } | |
731 | *outl = soutl; | |
732 | } | |
733 | ||
734 | return ret; | |
735 | ||
736 | /* TODO(3.0): Remove legacy code below */ | |
737 | legacy: | |
738 | ||
7141ba31 MC |
739 | b = ctx->cipher->block_size; |
740 | ||
64846096 LP |
741 | if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS)) |
742 | cmpl = (cmpl + 7) / 8; | |
743 | ||
0f113f3e | 744 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
64846096 | 745 | if (b == 1 && is_partially_overlapping(out, in, cmpl)) { |
83151b73 | 746 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); |
5fc77684 | 747 | return 0; |
83151b73 | 748 | } |
5fc77684 | 749 | |
0f113f3e MC |
750 | fix_len = ctx->cipher->do_cipher(ctx, out, in, inl); |
751 | if (fix_len < 0) { | |
752 | *outl = 0; | |
753 | return 0; | |
754 | } else | |
755 | *outl = fix_len; | |
756 | return 1; | |
757 | } | |
758 | ||
2c236894 MC |
759 | if (inl <= 0) { |
760 | *outl = 0; | |
761 | return inl == 0; | |
762 | } | |
763 | ||
0f113f3e | 764 | if (ctx->flags & EVP_CIPH_NO_PADDING) |
a8bf2f8f | 765 | return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl); |
0f113f3e | 766 | |
cbe29648 | 767 | OPENSSL_assert(b <= sizeof(ctx->final)); |
0f113f3e MC |
768 | |
769 | if (ctx->final_used) { | |
5fc77684 AP |
770 | /* see comment about PTRDIFF_T comparison above */ |
771 | if (((PTRDIFF_T)out == (PTRDIFF_T)in) | |
83151b73 AP |
772 | || is_partially_overlapping(out, in, b)) { |
773 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); | |
5fc77684 | 774 | return 0; |
83151b73 | 775 | } |
0f113f3e MC |
776 | memcpy(out, ctx->final, b); |
777 | out += b; | |
778 | fix_len = 1; | |
779 | } else | |
780 | fix_len = 0; | |
781 | ||
a8bf2f8f | 782 | if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl)) |
0f113f3e MC |
783 | return 0; |
784 | ||
785 | /* | |
786 | * if we have 'decrypted' a multiple of block size, make sure we have a | |
787 | * copy of this last block | |
788 | */ | |
789 | if (b > 1 && !ctx->buf_len) { | |
790 | *outl -= b; | |
791 | ctx->final_used = 1; | |
792 | memcpy(ctx->final, &out[*outl], b); | |
793 | } else | |
794 | ctx->final_used = 0; | |
795 | ||
796 | if (fix_len) | |
797 | *outl += b; | |
798 | ||
799 | return 1; | |
800 | } | |
d02b48c6 | 801 | |
6b691a5c | 802 | int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
803 | { |
804 | int ret; | |
805 | ret = EVP_DecryptFinal_ex(ctx, out, outl); | |
806 | return ret; | |
807 | } | |
581f1c84 DSH |
808 | |
809 | int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
0f113f3e MC |
810 | { |
811 | int i, n; | |
812 | unsigned int b; | |
df05f2ce MC |
813 | size_t soutl; |
814 | int ret; | |
3b94944c | 815 | int blocksize; |
a8bf2f8f RL |
816 | |
817 | /* Prevent accidental use of encryption context when decrypting */ | |
818 | if (ctx->encrypt) { | |
819 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION); | |
820 | return 0; | |
821 | } | |
822 | ||
df05f2ce MC |
823 | if (ctx->cipher == NULL || ctx->cipher->prov == NULL) |
824 | goto legacy; | |
825 | ||
3b94944c MC |
826 | blocksize = EVP_CIPHER_CTX_block_size(ctx); |
827 | ||
828 | if (blocksize < 1 || ctx->cipher->cfinal == NULL) { | |
df05f2ce MC |
829 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR); |
830 | return 0; | |
831 | } | |
832 | ||
3b94944c MC |
833 | ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl, |
834 | blocksize == 1 ? 0 : blocksize); | |
df05f2ce MC |
835 | |
836 | if (ret) { | |
837 | if (soutl > INT_MAX) { | |
838 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR); | |
839 | return 0; | |
840 | } | |
841 | *outl = soutl; | |
842 | } | |
843 | ||
844 | return ret; | |
845 | ||
846 | /* TODO(3.0): Remove legacy code below */ | |
847 | legacy: | |
848 | ||
0f113f3e | 849 | *outl = 0; |
ff6c7cc6 P |
850 | if (ctx->cipher == NULL) { |
851 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_NO_CIPHER_SET); | |
852 | return 0; | |
853 | } | |
0f113f3e MC |
854 | |
855 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
856 | i = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
857 | if (i < 0) | |
858 | return 0; | |
859 | else | |
860 | *outl = i; | |
861 | return 1; | |
862 | } | |
863 | ||
864 | b = ctx->cipher->block_size; | |
865 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
866 | if (ctx->buf_len) { | |
867 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, | |
868 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
869 | return 0; | |
870 | } | |
871 | *outl = 0; | |
872 | return 1; | |
873 | } | |
874 | if (b > 1) { | |
875 | if (ctx->buf_len || !ctx->final_used) { | |
876 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH); | |
26a7d938 | 877 | return 0; |
0f113f3e | 878 | } |
cbe29648 | 879 | OPENSSL_assert(b <= sizeof(ctx->final)); |
0f113f3e MC |
880 | |
881 | /* | |
882 | * The following assumes that the ciphertext has been authenticated. | |
883 | * Otherwise it provides a padding oracle. | |
884 | */ | |
885 | n = ctx->final[b - 1]; | |
886 | if (n == 0 || n > (int)b) { | |
887 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
26a7d938 | 888 | return 0; |
0f113f3e MC |
889 | } |
890 | for (i = 0; i < n; i++) { | |
891 | if (ctx->final[--b] != n) { | |
892 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
26a7d938 | 893 | return 0; |
0f113f3e MC |
894 | } |
895 | } | |
896 | n = ctx->cipher->block_size - n; | |
897 | for (i = 0; i < n; i++) | |
898 | out[i] = ctx->final[i]; | |
899 | *outl = n; | |
900 | } else | |
901 | *outl = 0; | |
208fb891 | 902 | return 1; |
0f113f3e | 903 | } |
d02b48c6 | 904 | |
6343829a | 905 | int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) |
0f113f3e MC |
906 | { |
907 | if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) | |
908 | return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); | |
df05f2ce | 909 | if (EVP_CIPHER_CTX_key_length(c) == keylen) |
0f113f3e MC |
910 | return 1; |
911 | if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) { | |
912 | c->key_len = keylen; | |
913 | return 1; | |
914 | } | |
915 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH); | |
916 | return 0; | |
917 | } | |
49528751 | 918 | |
f2e5ca84 | 919 | int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) |
0f113f3e MC |
920 | { |
921 | if (pad) | |
922 | ctx->flags &= ~EVP_CIPH_NO_PADDING; | |
923 | else | |
924 | ctx->flags |= EVP_CIPH_NO_PADDING; | |
df05f2ce MC |
925 | |
926 | if (ctx->cipher != NULL && ctx->cipher->prov != NULL) { | |
927 | OSSL_PARAM params[] = { | |
928 | OSSL_PARAM_int(OSSL_CIPHER_PARAM_PADDING, NULL), | |
929 | OSSL_PARAM_END | |
930 | }; | |
931 | ||
932 | params[0].data = &pad; | |
933 | ||
718b133a | 934 | if (ctx->cipher->ctx_set_params == NULL) { |
df05f2ce MC |
935 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_PADDING, EVP_R_CTRL_NOT_IMPLEMENTED); |
936 | return 0; | |
937 | } | |
938 | ||
718b133a | 939 | if (!ctx->cipher->ctx_set_params(ctx->provctx, params)) |
df05f2ce MC |
940 | return 0; |
941 | } | |
942 | ||
0f113f3e MC |
943 | return 1; |
944 | } | |
f2e5ca84 | 945 | |
49528751 DSH |
946 | int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) |
947 | { | |
0f113f3e | 948 | int ret; |
d91f4568 | 949 | |
0f113f3e MC |
950 | if (!ctx->cipher) { |
951 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); | |
952 | return 0; | |
953 | } | |
954 | ||
955 | if (!ctx->cipher->ctrl) { | |
956 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); | |
957 | return 0; | |
958 | } | |
959 | ||
960 | ret = ctx->cipher->ctrl(ctx, type, arg, ptr); | |
961 | if (ret == -1) { | |
962 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, | |
963 | EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); | |
964 | return 0; | |
965 | } | |
966 | return ret; | |
49528751 | 967 | } |
216659eb DSH |
968 | |
969 | int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) | |
0f113f3e | 970 | { |
d0510566 | 971 | int kl; |
0f113f3e MC |
972 | if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) |
973 | return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); | |
d0510566 P |
974 | kl = EVP_CIPHER_CTX_key_length(ctx); |
975 | if (kl <= 0 || RAND_priv_bytes(key, kl) <= 0) | |
0f113f3e MC |
976 | return 0; |
977 | return 1; | |
978 | } | |
216659eb | 979 | |
c2bf7208 | 980 | int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) |
0f113f3e MC |
981 | { |
982 | if ((in == NULL) || (in->cipher == NULL)) { | |
983 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED); | |
984 | return 0; | |
985 | } | |
df05f2ce MC |
986 | |
987 | if (in->cipher->prov == NULL) | |
988 | goto legacy; | |
989 | ||
990 | if (in->cipher->dupctx == NULL) { | |
991 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX); | |
992 | return 0; | |
993 | } | |
994 | ||
995 | EVP_CIPHER_CTX_reset(out); | |
996 | ||
997 | *out = *in; | |
998 | out->provctx = NULL; | |
999 | ||
718b133a | 1000 | if (in->fetched_cipher != NULL && !EVP_CIPHER_upref(in->fetched_cipher)) { |
df05f2ce MC |
1001 | out->fetched_cipher = NULL; |
1002 | return 0; | |
1003 | } | |
1004 | ||
1005 | out->provctx = in->cipher->dupctx(in->provctx); | |
1006 | if (out->provctx == NULL) { | |
1007 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX); | |
1008 | return 0; | |
1009 | } | |
1010 | ||
1011 | return 1; | |
1012 | ||
1013 | /* TODO(3.0): Remove legacy code below */ | |
1014 | legacy: | |
1015 | ||
c2bf7208 | 1016 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
1017 | /* Make sure it's safe to copy a cipher context using an ENGINE */ |
1018 | if (in->engine && !ENGINE_init(in->engine)) { | |
1019 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB); | |
1020 | return 0; | |
1021 | } | |
c2bf7208 DSH |
1022 | #endif |
1023 | ||
c0ca39bd | 1024 | EVP_CIPHER_CTX_reset(out); |
b4faea50 | 1025 | memcpy(out, in, sizeof(*out)); |
0f113f3e MC |
1026 | |
1027 | if (in->cipher_data && in->cipher->ctx_size) { | |
1028 | out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size); | |
90945fa3 | 1029 | if (out->cipher_data == NULL) { |
273a0218 | 1030 | out->cipher = NULL; |
0f113f3e MC |
1031 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE); |
1032 | return 0; | |
1033 | } | |
1034 | memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size); | |
1035 | } | |
1036 | ||
1037 | if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) | |
273a0218 BE |
1038 | if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) { |
1039 | out->cipher = NULL; | |
1040 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR); | |
1041 | return 0; | |
1042 | } | |
0f113f3e MC |
1043 | return 1; |
1044 | } | |
df05f2ce | 1045 | |
0211740f | 1046 | static void *evp_cipher_from_dispatch(const OSSL_DISPATCH *fns, |
df05f2ce MC |
1047 | OSSL_PROVIDER *prov) |
1048 | { | |
1049 | EVP_CIPHER *cipher = NULL; | |
1050 | int fnciphcnt = 0, fnctxcnt = 0; | |
1051 | ||
0211740f RL |
1052 | /* |
1053 | * The legacy NID is set by EVP_CIPHER_fetch() if the name exists in | |
1054 | * the object database. | |
1055 | */ | |
1056 | if ((cipher = EVP_CIPHER_meth_new(0, 0, 0)) == NULL) | |
df05f2ce MC |
1057 | return NULL; |
1058 | ||
1059 | for (; fns->function_id != 0; fns++) { | |
1060 | switch (fns->function_id) { | |
1061 | case OSSL_FUNC_CIPHER_NEWCTX: | |
1062 | if (cipher->newctx != NULL) | |
1063 | break; | |
1064 | cipher->newctx = OSSL_get_OP_cipher_newctx(fns); | |
1065 | fnctxcnt++; | |
1066 | break; | |
1067 | case OSSL_FUNC_CIPHER_ENCRYPT_INIT: | |
1068 | if (cipher->einit != NULL) | |
1069 | break; | |
1070 | cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns); | |
1071 | fnciphcnt++; | |
1072 | break; | |
1073 | case OSSL_FUNC_CIPHER_DECRYPT_INIT: | |
1074 | if (cipher->dinit != NULL) | |
1075 | break; | |
1076 | cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns); | |
1077 | fnciphcnt++; | |
1078 | break; | |
1079 | case OSSL_FUNC_CIPHER_UPDATE: | |
1080 | if (cipher->cupdate != NULL) | |
1081 | break; | |
1082 | cipher->cupdate = OSSL_get_OP_cipher_update(fns); | |
1083 | fnciphcnt++; | |
1084 | break; | |
1085 | case OSSL_FUNC_CIPHER_FINAL: | |
1086 | if (cipher->cfinal != NULL) | |
1087 | break; | |
1088 | cipher->cfinal = OSSL_get_OP_cipher_final(fns); | |
1089 | fnciphcnt++; | |
1090 | break; | |
718b133a MC |
1091 | case OSSL_FUNC_CIPHER_CIPHER: |
1092 | if (cipher->ccipher != NULL) | |
1093 | break; | |
1094 | cipher->ccipher = OSSL_get_OP_cipher_cipher(fns); | |
1095 | break; | |
df05f2ce MC |
1096 | case OSSL_FUNC_CIPHER_FREECTX: |
1097 | if (cipher->freectx != NULL) | |
1098 | break; | |
1099 | cipher->freectx = OSSL_get_OP_cipher_freectx(fns); | |
1100 | fnctxcnt++; | |
1101 | break; | |
1102 | case OSSL_FUNC_CIPHER_DUPCTX: | |
1103 | if (cipher->dupctx != NULL) | |
1104 | break; | |
1105 | cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns); | |
1106 | break; | |
1107 | case OSSL_FUNC_CIPHER_KEY_LENGTH: | |
1108 | if (cipher->key_length != NULL) | |
1109 | break; | |
1110 | cipher->key_length = OSSL_get_OP_cipher_key_length(fns); | |
1111 | break; | |
718b133a MC |
1112 | case OSSL_FUNC_CIPHER_IV_LENGTH: |
1113 | if (cipher->iv_length != NULL) | |
1114 | break; | |
1115 | cipher->iv_length = OSSL_get_OP_cipher_iv_length(fns); | |
1116 | break; | |
1117 | case OSSL_FUNC_CIPHER_BLOCK_SIZE: | |
1118 | if (cipher->blocksize != NULL) | |
1119 | break; | |
1120 | cipher->blocksize = OSSL_get_OP_cipher_block_size(fns); | |
1121 | break; | |
df05f2ce MC |
1122 | case OSSL_FUNC_CIPHER_GET_PARAMS: |
1123 | if (cipher->get_params != NULL) | |
1124 | break; | |
1125 | cipher->get_params = OSSL_get_OP_cipher_get_params(fns); | |
1126 | break; | |
718b133a MC |
1127 | case OSSL_FUNC_CIPHER_CTX_GET_PARAMS: |
1128 | if (cipher->ctx_get_params != NULL) | |
1129 | break; | |
1130 | cipher->ctx_get_params = OSSL_get_OP_cipher_ctx_get_params(fns); | |
1131 | break; | |
1132 | case OSSL_FUNC_CIPHER_CTX_SET_PARAMS: | |
1133 | if (cipher->ctx_set_params != NULL) | |
df05f2ce | 1134 | break; |
718b133a | 1135 | cipher->ctx_set_params = OSSL_get_OP_cipher_ctx_set_params(fns); |
df05f2ce MC |
1136 | break; |
1137 | } | |
1138 | } | |
718b133a MC |
1139 | if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4) |
1140 | || (fnciphcnt == 0 && cipher->ccipher == NULL) | |
dcd446f1 MC |
1141 | || fnctxcnt != 2 |
1142 | || cipher->blocksize == NULL | |
1143 | || cipher->iv_length == NULL | |
1144 | || cipher->key_length == NULL) { | |
df05f2ce MC |
1145 | /* |
1146 | * In order to be a consistent set of functions we must have at least | |
1147 | * a complete set of "encrypt" functions, or a complete set of "decrypt" | |
718b133a | 1148 | * functions, or a single "cipher" function. In all cases we need a |
dcd446f1 MC |
1149 | * complete set of context management functions, as well as the |
1150 | * blocksize, iv_length and key_length functions. | |
df05f2ce MC |
1151 | */ |
1152 | EVP_CIPHER_meth_free(cipher); | |
1153 | EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS); | |
1154 | return NULL; | |
1155 | } | |
1156 | cipher->prov = prov; | |
1157 | if (prov != NULL) | |
1158 | ossl_provider_upref(prov); | |
1159 | ||
1160 | return cipher; | |
1161 | } | |
1162 | ||
1163 | static int evp_cipher_upref(void *cipher) | |
1164 | { | |
1165 | return EVP_CIPHER_upref(cipher); | |
1166 | } | |
1167 | ||
1168 | static void evp_cipher_free(void *cipher) | |
1169 | { | |
1170 | EVP_CIPHER_meth_free(cipher); | |
1171 | } | |
1172 | ||
df05f2ce MC |
1173 | EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm, |
1174 | const char *properties) | |
1175 | { | |
0211740f RL |
1176 | EVP_CIPHER *cipher = |
1177 | evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties, | |
1178 | evp_cipher_from_dispatch, evp_cipher_upref, | |
1179 | evp_cipher_free); | |
1180 | ||
1181 | #ifndef FIPS_MODE | |
1182 | /* TODO(3.x) get rid of the need for legacy NIDs */ | |
1183 | if (cipher != NULL) { | |
1184 | /* | |
1185 | * FIPS module note: since internal fetches will be entirely | |
1186 | * provider based, we know that none of its code depends on legacy | |
1187 | * NIDs or any functionality that use them. | |
1188 | */ | |
1189 | cipher->nid = OBJ_sn2nid(algorithm); | |
1190 | } | |
1191 | #endif | |
1192 | ||
1193 | return cipher; | |
df05f2ce | 1194 | } |