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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 |
0f113f3e MC |
341 | /* we assume block size is a power of 2 in *cryptUpdate */ |
342 | OPENSSL_assert(ctx->cipher->block_size == 1 | |
343 | || ctx->cipher->block_size == 8 | |
344 | || ctx->cipher->block_size == 16); | |
345 | ||
346 | if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW) | |
347 | && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) { | |
348 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED); | |
349 | return 0; | |
350 | } | |
351 | ||
480d3323 | 352 | if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) { |
0f113f3e MC |
353 | switch (EVP_CIPHER_CTX_mode(ctx)) { |
354 | ||
355 | case EVP_CIPH_STREAM_CIPHER: | |
356 | case EVP_CIPH_ECB_MODE: | |
357 | break; | |
358 | ||
359 | case EVP_CIPH_CFB_MODE: | |
360 | case EVP_CIPH_OFB_MODE: | |
361 | ||
362 | ctx->num = 0; | |
363 | /* fall-through */ | |
364 | ||
365 | case EVP_CIPH_CBC_MODE: | |
366 | ||
367 | OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= | |
368 | (int)sizeof(ctx->iv)); | |
369 | if (iv) | |
370 | memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
371 | memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); | |
372 | break; | |
373 | ||
374 | case EVP_CIPH_CTR_MODE: | |
375 | ctx->num = 0; | |
376 | /* Don't reuse IV for CTR mode */ | |
377 | if (iv) | |
378 | memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
379 | break; | |
380 | ||
381 | default: | |
382 | return 0; | |
0f113f3e MC |
383 | } |
384 | } | |
385 | ||
386 | if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { | |
387 | if (!ctx->cipher->init(ctx, key, iv, enc)) | |
388 | return 0; | |
389 | } | |
390 | ctx->buf_len = 0; | |
391 | ctx->final_used = 0; | |
392 | ctx->block_mask = ctx->cipher->block_size - 1; | |
393 | return 1; | |
394 | } | |
d02b48c6 | 395 | |
be06a934 | 396 | int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
397 | const unsigned char *in, int inl) |
398 | { | |
399 | if (ctx->encrypt) | |
400 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
401 | else | |
402 | return EVP_DecryptUpdate(ctx, out, outl, in, inl); | |
403 | } | |
d02b48c6 | 404 | |
581f1c84 | 405 | int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
406 | { |
407 | if (ctx->encrypt) | |
408 | return EVP_EncryptFinal_ex(ctx, out, outl); | |
409 | else | |
410 | return EVP_DecryptFinal_ex(ctx, out, outl); | |
411 | } | |
581f1c84 | 412 | |
6b691a5c | 413 | int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
414 | { |
415 | if (ctx->encrypt) | |
416 | return EVP_EncryptFinal(ctx, out, outl); | |
417 | else | |
418 | return EVP_DecryptFinal(ctx, out, outl); | |
419 | } | |
d02b48c6 | 420 | |
be06a934 | 421 | int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
422 | const unsigned char *key, const unsigned char *iv) |
423 | { | |
424 | return EVP_CipherInit(ctx, cipher, key, iv, 1); | |
425 | } | |
18eda732 | 426 | |
0f113f3e MC |
427 | int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
428 | ENGINE *impl, const unsigned char *key, | |
429 | const unsigned char *iv) | |
430 | { | |
431 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); | |
432 | } | |
d02b48c6 | 433 | |
be06a934 | 434 | int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
435 | const unsigned char *key, const unsigned char *iv) |
436 | { | |
437 | return EVP_CipherInit(ctx, cipher, key, iv, 0); | |
438 | } | |
18eda732 | 439 | |
0f113f3e MC |
440 | int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
441 | ENGINE *impl, const unsigned char *key, | |
442 | const unsigned char *iv) | |
443 | { | |
444 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); | |
445 | } | |
d02b48c6 | 446 | |
c3a73daf AP |
447 | /* |
448 | * According to the letter of standard difference between pointers | |
449 | * is specified to be valid only within same object. This makes | |
450 | * it formally challenging to determine if input and output buffers | |
451 | * are not partially overlapping with standard pointer arithmetic. | |
452 | */ | |
453 | #ifdef PTRDIFF_T | |
454 | # undef PTRDIFF_T | |
455 | #endif | |
456 | #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64 | |
457 | /* | |
458 | * Then we have VMS that distinguishes itself by adhering to | |
5fc77684 AP |
459 | * sizeof(size_t)==4 even in 64-bit builds, which means that |
460 | * difference between two pointers might be truncated to 32 bits. | |
461 | * In the context one can even wonder how comparison for | |
462 | * equality is implemented. To be on the safe side we adhere to | |
463 | * PTRDIFF_T even for comparison for equality. | |
c3a73daf AP |
464 | */ |
465 | # define PTRDIFF_T uint64_t | |
466 | #else | |
467 | # define PTRDIFF_T size_t | |
468 | #endif | |
469 | ||
7141ba31 | 470 | int is_partially_overlapping(const void *ptr1, const void *ptr2, int len) |
c3a73daf AP |
471 | { |
472 | PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2; | |
473 | /* | |
474 | * Check for partially overlapping buffers. [Binary logical | |
475 | * operations are used instead of boolean to minimize number | |
476 | * of conditional branches.] | |
477 | */ | |
83151b73 AP |
478 | int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) | |
479 | (diff > (0 - (PTRDIFF_T)len))); | |
b153f092 | 480 | |
83151b73 | 481 | return overlapped; |
c3a73daf AP |
482 | } |
483 | ||
a8bf2f8f RL |
484 | static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx, |
485 | unsigned char *out, int *outl, | |
486 | const unsigned char *in, int inl) | |
0f113f3e | 487 | { |
64846096 LP |
488 | int i, j, bl, cmpl = inl; |
489 | ||
490 | if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS)) | |
491 | cmpl = (cmpl + 7) / 8; | |
0f113f3e | 492 | |
7141ba31 MC |
493 | bl = ctx->cipher->block_size; |
494 | ||
dcb982d7 RL |
495 | if (inl <= 0) { |
496 | *outl = 0; | |
497 | return inl == 0; | |
498 | } | |
499 | ||
0f113f3e | 500 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
7141ba31 | 501 | /* If block size > 1 then the cipher will have to do this check */ |
64846096 | 502 | if (bl == 1 && is_partially_overlapping(out, in, cmpl)) { |
a8bf2f8f | 503 | EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); |
5fc77684 | 504 | return 0; |
83151b73 | 505 | } |
5fc77684 | 506 | |
0f113f3e MC |
507 | i = ctx->cipher->do_cipher(ctx, out, in, inl); |
508 | if (i < 0) | |
509 | return 0; | |
510 | else | |
511 | *outl = i; | |
512 | return 1; | |
513 | } | |
514 | ||
64846096 | 515 | if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) { |
a8bf2f8f | 516 | EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); |
5fc77684 | 517 | return 0; |
83151b73 | 518 | } |
0f113f3e MC |
519 | |
520 | if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) { | |
521 | if (ctx->cipher->do_cipher(ctx, out, in, inl)) { | |
522 | *outl = inl; | |
523 | return 1; | |
524 | } else { | |
525 | *outl = 0; | |
526 | return 0; | |
527 | } | |
528 | } | |
529 | i = ctx->buf_len; | |
0f113f3e MC |
530 | OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); |
531 | if (i != 0) { | |
3f358213 | 532 | if (bl - i > inl) { |
0f113f3e MC |
533 | memcpy(&(ctx->buf[i]), in, inl); |
534 | ctx->buf_len += inl; | |
535 | *outl = 0; | |
536 | return 1; | |
537 | } else { | |
538 | j = bl - i; | |
539 | memcpy(&(ctx->buf[i]), in, j); | |
0f113f3e MC |
540 | inl -= j; |
541 | in += j; | |
5fc77684 AP |
542 | if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl)) |
543 | return 0; | |
0f113f3e MC |
544 | out += bl; |
545 | *outl = bl; | |
546 | } | |
547 | } else | |
548 | *outl = 0; | |
549 | i = inl & (bl - 1); | |
550 | inl -= i; | |
551 | if (inl > 0) { | |
552 | if (!ctx->cipher->do_cipher(ctx, out, in, inl)) | |
553 | return 0; | |
554 | *outl += inl; | |
555 | } | |
556 | ||
557 | if (i != 0) | |
558 | memcpy(ctx->buf, &(in[inl]), i); | |
559 | ctx->buf_len = i; | |
560 | return 1; | |
561 | } | |
d02b48c6 | 562 | |
a8bf2f8f RL |
563 | |
564 | int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, | |
565 | const unsigned char *in, int inl) | |
566 | { | |
df05f2ce MC |
567 | int ret; |
568 | size_t soutl; | |
3b94944c | 569 | int blocksize; |
df05f2ce | 570 | |
a8bf2f8f RL |
571 | /* Prevent accidental use of decryption context when encrypting */ |
572 | if (!ctx->encrypt) { | |
573 | EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION); | |
574 | return 0; | |
575 | } | |
576 | ||
df05f2ce MC |
577 | if (ctx->cipher == NULL || ctx->cipher->prov == NULL) |
578 | goto legacy; | |
579 | ||
3b94944c MC |
580 | blocksize = EVP_CIPHER_CTX_block_size(ctx); |
581 | ||
582 | if (ctx->cipher->cupdate == NULL || blocksize < 1) { | |
df05f2ce MC |
583 | EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR); |
584 | return 0; | |
585 | } | |
3b94944c MC |
586 | ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl, |
587 | inl + (blocksize == 1 ? 0 : blocksize), in, | |
588 | (size_t)inl); | |
df05f2ce MC |
589 | |
590 | if (soutl > INT_MAX) { | |
591 | EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR); | |
592 | return 0; | |
593 | } | |
594 | *outl = soutl; | |
595 | return ret; | |
596 | ||
597 | /* TODO(3.0): Remove legacy code below */ | |
598 | legacy: | |
599 | ||
a8bf2f8f RL |
600 | return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl); |
601 | } | |
602 | ||
be06a934 | 603 | int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
604 | { |
605 | int ret; | |
606 | ret = EVP_EncryptFinal_ex(ctx, out, outl); | |
607 | return ret; | |
608 | } | |
581f1c84 DSH |
609 | |
610 | int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
0f113f3e MC |
611 | { |
612 | int n, ret; | |
613 | unsigned int i, b, bl; | |
df05f2ce | 614 | size_t soutl; |
3b94944c | 615 | int blocksize; |
0f113f3e | 616 | |
a8bf2f8f RL |
617 | /* Prevent accidental use of decryption context when encrypting */ |
618 | if (!ctx->encrypt) { | |
619 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION); | |
620 | return 0; | |
621 | } | |
622 | ||
4894dcad P |
623 | if (ctx->cipher == NULL) { |
624 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_NO_CIPHER_SET); | |
625 | return 0; | |
626 | } | |
627 | if (ctx->cipher->prov == NULL) | |
df05f2ce MC |
628 | goto legacy; |
629 | ||
3b94944c MC |
630 | blocksize = EVP_CIPHER_CTX_block_size(ctx); |
631 | ||
632 | if (blocksize < 1 || ctx->cipher->cfinal == NULL) { | |
df05f2ce MC |
633 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR); |
634 | return 0; | |
635 | } | |
636 | ||
3b94944c MC |
637 | ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl, |
638 | blocksize == 1 ? 0 : blocksize); | |
df05f2ce MC |
639 | |
640 | if (soutl > INT_MAX) { | |
641 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR); | |
642 | return 0; | |
643 | } | |
644 | *outl = soutl; | |
645 | ||
646 | return ret; | |
647 | ||
648 | /* TODO(3.0): Remove legacy code below */ | |
649 | legacy: | |
650 | ||
0f113f3e MC |
651 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
652 | ret = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
653 | if (ret < 0) | |
654 | return 0; | |
655 | else | |
656 | *outl = ret; | |
657 | return 1; | |
658 | } | |
659 | ||
660 | b = ctx->cipher->block_size; | |
cbe29648 | 661 | OPENSSL_assert(b <= sizeof(ctx->buf)); |
0f113f3e MC |
662 | if (b == 1) { |
663 | *outl = 0; | |
664 | return 1; | |
665 | } | |
666 | bl = ctx->buf_len; | |
667 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
668 | if (bl) { | |
669 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, | |
670 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
671 | return 0; | |
672 | } | |
673 | *outl = 0; | |
674 | return 1; | |
675 | } | |
676 | ||
677 | n = b - bl; | |
678 | for (i = bl; i < b; i++) | |
679 | ctx->buf[i] = n; | |
680 | ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b); | |
681 | ||
682 | if (ret) | |
683 | *outl = b; | |
684 | ||
685 | return ret; | |
686 | } | |
d02b48c6 | 687 | |
be06a934 | 688 | int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
689 | const unsigned char *in, int inl) |
690 | { | |
df05f2ce | 691 | int fix_len, cmpl = inl, ret; |
0f113f3e | 692 | unsigned int b; |
df05f2ce | 693 | size_t soutl; |
3b94944c | 694 | int blocksize; |
0f113f3e | 695 | |
a8bf2f8f RL |
696 | /* Prevent accidental use of encryption context when decrypting */ |
697 | if (ctx->encrypt) { | |
698 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION); | |
699 | return 0; | |
700 | } | |
701 | ||
d2c2e49e P |
702 | if (ctx->cipher == NULL) { |
703 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_NO_CIPHER_SET); | |
704 | return 0; | |
705 | } | |
706 | if (ctx->cipher->prov == NULL) | |
df05f2ce MC |
707 | goto legacy; |
708 | ||
3b94944c MC |
709 | blocksize = EVP_CIPHER_CTX_block_size(ctx); |
710 | ||
711 | if (ctx->cipher->cupdate == NULL || blocksize < 1) { | |
df05f2ce MC |
712 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR); |
713 | return 0; | |
714 | } | |
3b94944c MC |
715 | ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl, |
716 | inl + (blocksize == 1 ? 0 : blocksize), in, | |
717 | (size_t)inl); | |
df05f2ce MC |
718 | |
719 | if (ret) { | |
720 | if (soutl > INT_MAX) { | |
721 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR); | |
722 | return 0; | |
723 | } | |
724 | *outl = soutl; | |
725 | } | |
726 | ||
727 | return ret; | |
728 | ||
729 | /* TODO(3.0): Remove legacy code below */ | |
730 | legacy: | |
731 | ||
7141ba31 MC |
732 | b = ctx->cipher->block_size; |
733 | ||
64846096 LP |
734 | if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS)) |
735 | cmpl = (cmpl + 7) / 8; | |
736 | ||
dcb982d7 RL |
737 | if (inl <= 0) { |
738 | *outl = 0; | |
739 | return inl == 0; | |
740 | } | |
741 | ||
0f113f3e | 742 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
64846096 | 743 | if (b == 1 && is_partially_overlapping(out, in, cmpl)) { |
83151b73 | 744 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); |
5fc77684 | 745 | return 0; |
83151b73 | 746 | } |
5fc77684 | 747 | |
0f113f3e MC |
748 | fix_len = ctx->cipher->do_cipher(ctx, out, in, inl); |
749 | if (fix_len < 0) { | |
750 | *outl = 0; | |
751 | return 0; | |
752 | } else | |
753 | *outl = fix_len; | |
754 | return 1; | |
755 | } | |
756 | ||
0f113f3e | 757 | if (ctx->flags & EVP_CIPH_NO_PADDING) |
a8bf2f8f | 758 | return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl); |
0f113f3e | 759 | |
cbe29648 | 760 | OPENSSL_assert(b <= sizeof(ctx->final)); |
0f113f3e MC |
761 | |
762 | if (ctx->final_used) { | |
5fc77684 AP |
763 | /* see comment about PTRDIFF_T comparison above */ |
764 | if (((PTRDIFF_T)out == (PTRDIFF_T)in) | |
83151b73 AP |
765 | || is_partially_overlapping(out, in, b)) { |
766 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); | |
5fc77684 | 767 | return 0; |
83151b73 | 768 | } |
0f113f3e MC |
769 | memcpy(out, ctx->final, b); |
770 | out += b; | |
771 | fix_len = 1; | |
772 | } else | |
773 | fix_len = 0; | |
774 | ||
a8bf2f8f | 775 | if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl)) |
0f113f3e MC |
776 | return 0; |
777 | ||
778 | /* | |
779 | * if we have 'decrypted' a multiple of block size, make sure we have a | |
780 | * copy of this last block | |
781 | */ | |
782 | if (b > 1 && !ctx->buf_len) { | |
783 | *outl -= b; | |
784 | ctx->final_used = 1; | |
785 | memcpy(ctx->final, &out[*outl], b); | |
786 | } else | |
787 | ctx->final_used = 0; | |
788 | ||
789 | if (fix_len) | |
790 | *outl += b; | |
791 | ||
792 | return 1; | |
793 | } | |
d02b48c6 | 794 | |
6b691a5c | 795 | int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
796 | { |
797 | int ret; | |
798 | ret = EVP_DecryptFinal_ex(ctx, out, outl); | |
799 | return ret; | |
800 | } | |
581f1c84 DSH |
801 | |
802 | int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
0f113f3e MC |
803 | { |
804 | int i, n; | |
805 | unsigned int b; | |
df05f2ce MC |
806 | size_t soutl; |
807 | int ret; | |
3b94944c | 808 | int blocksize; |
a8bf2f8f RL |
809 | |
810 | /* Prevent accidental use of encryption context when decrypting */ | |
811 | if (ctx->encrypt) { | |
812 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION); | |
813 | return 0; | |
814 | } | |
815 | ||
df05f2ce MC |
816 | if (ctx->cipher == NULL || ctx->cipher->prov == NULL) |
817 | goto legacy; | |
818 | ||
3b94944c MC |
819 | blocksize = EVP_CIPHER_CTX_block_size(ctx); |
820 | ||
821 | if (blocksize < 1 || ctx->cipher->cfinal == NULL) { | |
df05f2ce MC |
822 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR); |
823 | return 0; | |
824 | } | |
825 | ||
3b94944c MC |
826 | ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl, |
827 | blocksize == 1 ? 0 : blocksize); | |
df05f2ce MC |
828 | |
829 | if (ret) { | |
830 | if (soutl > INT_MAX) { | |
831 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR); | |
832 | return 0; | |
833 | } | |
834 | *outl = soutl; | |
835 | } | |
836 | ||
837 | return ret; | |
838 | ||
839 | /* TODO(3.0): Remove legacy code below */ | |
840 | legacy: | |
841 | ||
0f113f3e MC |
842 | *outl = 0; |
843 | ||
844 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
845 | i = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
846 | if (i < 0) | |
847 | return 0; | |
848 | else | |
849 | *outl = i; | |
850 | return 1; | |
851 | } | |
852 | ||
853 | b = ctx->cipher->block_size; | |
854 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
855 | if (ctx->buf_len) { | |
856 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, | |
857 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
858 | return 0; | |
859 | } | |
860 | *outl = 0; | |
861 | return 1; | |
862 | } | |
863 | if (b > 1) { | |
864 | if (ctx->buf_len || !ctx->final_used) { | |
865 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH); | |
26a7d938 | 866 | return 0; |
0f113f3e | 867 | } |
cbe29648 | 868 | OPENSSL_assert(b <= sizeof(ctx->final)); |
0f113f3e MC |
869 | |
870 | /* | |
871 | * The following assumes that the ciphertext has been authenticated. | |
872 | * Otherwise it provides a padding oracle. | |
873 | */ | |
874 | n = ctx->final[b - 1]; | |
875 | if (n == 0 || n > (int)b) { | |
876 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
26a7d938 | 877 | return 0; |
0f113f3e MC |
878 | } |
879 | for (i = 0; i < n; i++) { | |
880 | if (ctx->final[--b] != n) { | |
881 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
26a7d938 | 882 | return 0; |
0f113f3e MC |
883 | } |
884 | } | |
885 | n = ctx->cipher->block_size - n; | |
886 | for (i = 0; i < n; i++) | |
887 | out[i] = ctx->final[i]; | |
888 | *outl = n; | |
889 | } else | |
890 | *outl = 0; | |
208fb891 | 891 | return 1; |
0f113f3e | 892 | } |
d02b48c6 | 893 | |
6343829a | 894 | int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) |
0f113f3e MC |
895 | { |
896 | if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) | |
897 | return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); | |
df05f2ce | 898 | if (EVP_CIPHER_CTX_key_length(c) == keylen) |
0f113f3e MC |
899 | return 1; |
900 | if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) { | |
901 | c->key_len = keylen; | |
902 | return 1; | |
903 | } | |
904 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH); | |
905 | return 0; | |
906 | } | |
49528751 | 907 | |
f2e5ca84 | 908 | int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) |
0f113f3e MC |
909 | { |
910 | if (pad) | |
911 | ctx->flags &= ~EVP_CIPH_NO_PADDING; | |
912 | else | |
913 | ctx->flags |= EVP_CIPH_NO_PADDING; | |
df05f2ce MC |
914 | |
915 | if (ctx->cipher != NULL && ctx->cipher->prov != NULL) { | |
916 | OSSL_PARAM params[] = { | |
917 | OSSL_PARAM_int(OSSL_CIPHER_PARAM_PADDING, NULL), | |
918 | OSSL_PARAM_END | |
919 | }; | |
920 | ||
921 | params[0].data = &pad; | |
922 | ||
718b133a | 923 | if (ctx->cipher->ctx_set_params == NULL) { |
df05f2ce MC |
924 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_PADDING, EVP_R_CTRL_NOT_IMPLEMENTED); |
925 | return 0; | |
926 | } | |
927 | ||
718b133a | 928 | if (!ctx->cipher->ctx_set_params(ctx->provctx, params)) |
df05f2ce MC |
929 | return 0; |
930 | } | |
931 | ||
0f113f3e MC |
932 | return 1; |
933 | } | |
f2e5ca84 | 934 | |
49528751 DSH |
935 | int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) |
936 | { | |
0f113f3e | 937 | int ret; |
d91f4568 | 938 | |
0f113f3e MC |
939 | if (!ctx->cipher) { |
940 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); | |
941 | return 0; | |
942 | } | |
943 | ||
944 | if (!ctx->cipher->ctrl) { | |
945 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); | |
946 | return 0; | |
947 | } | |
948 | ||
949 | ret = ctx->cipher->ctrl(ctx, type, arg, ptr); | |
950 | if (ret == -1) { | |
951 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, | |
952 | EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); | |
953 | return 0; | |
954 | } | |
955 | return ret; | |
49528751 | 956 | } |
216659eb DSH |
957 | |
958 | int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) | |
0f113f3e MC |
959 | { |
960 | if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) | |
961 | return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); | |
361ecb1d | 962 | if (RAND_priv_bytes(key, EVP_CIPHER_CTX_key_length(ctx)) <= 0) |
0f113f3e MC |
963 | return 0; |
964 | return 1; | |
965 | } | |
216659eb | 966 | |
c2bf7208 | 967 | int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) |
0f113f3e MC |
968 | { |
969 | if ((in == NULL) || (in->cipher == NULL)) { | |
970 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED); | |
971 | return 0; | |
972 | } | |
df05f2ce MC |
973 | |
974 | if (in->cipher->prov == NULL) | |
975 | goto legacy; | |
976 | ||
977 | if (in->cipher->dupctx == NULL) { | |
978 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX); | |
979 | return 0; | |
980 | } | |
981 | ||
982 | EVP_CIPHER_CTX_reset(out); | |
983 | ||
984 | *out = *in; | |
985 | out->provctx = NULL; | |
986 | ||
718b133a | 987 | if (in->fetched_cipher != NULL && !EVP_CIPHER_upref(in->fetched_cipher)) { |
df05f2ce MC |
988 | out->fetched_cipher = NULL; |
989 | return 0; | |
990 | } | |
991 | ||
992 | out->provctx = in->cipher->dupctx(in->provctx); | |
993 | if (out->provctx == NULL) { | |
994 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX); | |
995 | return 0; | |
996 | } | |
997 | ||
998 | return 1; | |
999 | ||
1000 | /* TODO(3.0): Remove legacy code below */ | |
1001 | legacy: | |
1002 | ||
c2bf7208 | 1003 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
1004 | /* Make sure it's safe to copy a cipher context using an ENGINE */ |
1005 | if (in->engine && !ENGINE_init(in->engine)) { | |
1006 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB); | |
1007 | return 0; | |
1008 | } | |
c2bf7208 DSH |
1009 | #endif |
1010 | ||
c0ca39bd | 1011 | EVP_CIPHER_CTX_reset(out); |
b4faea50 | 1012 | memcpy(out, in, sizeof(*out)); |
0f113f3e MC |
1013 | |
1014 | if (in->cipher_data && in->cipher->ctx_size) { | |
1015 | out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size); | |
90945fa3 | 1016 | if (out->cipher_data == NULL) { |
273a0218 | 1017 | out->cipher = NULL; |
0f113f3e MC |
1018 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE); |
1019 | return 0; | |
1020 | } | |
1021 | memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size); | |
1022 | } | |
1023 | ||
1024 | if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) | |
273a0218 BE |
1025 | if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) { |
1026 | out->cipher = NULL; | |
1027 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR); | |
1028 | return 0; | |
1029 | } | |
0f113f3e MC |
1030 | return 1; |
1031 | } | |
df05f2ce MC |
1032 | |
1033 | static void *evp_cipher_from_dispatch(int nid, const OSSL_DISPATCH *fns, | |
1034 | OSSL_PROVIDER *prov) | |
1035 | { | |
1036 | EVP_CIPHER *cipher = NULL; | |
1037 | int fnciphcnt = 0, fnctxcnt = 0; | |
1038 | ||
1039 | if ((cipher = EVP_CIPHER_meth_new(nid, 0, 0)) == NULL) | |
1040 | return NULL; | |
1041 | ||
1042 | for (; fns->function_id != 0; fns++) { | |
1043 | switch (fns->function_id) { | |
1044 | case OSSL_FUNC_CIPHER_NEWCTX: | |
1045 | if (cipher->newctx != NULL) | |
1046 | break; | |
1047 | cipher->newctx = OSSL_get_OP_cipher_newctx(fns); | |
1048 | fnctxcnt++; | |
1049 | break; | |
1050 | case OSSL_FUNC_CIPHER_ENCRYPT_INIT: | |
1051 | if (cipher->einit != NULL) | |
1052 | break; | |
1053 | cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns); | |
1054 | fnciphcnt++; | |
1055 | break; | |
1056 | case OSSL_FUNC_CIPHER_DECRYPT_INIT: | |
1057 | if (cipher->dinit != NULL) | |
1058 | break; | |
1059 | cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns); | |
1060 | fnciphcnt++; | |
1061 | break; | |
1062 | case OSSL_FUNC_CIPHER_UPDATE: | |
1063 | if (cipher->cupdate != NULL) | |
1064 | break; | |
1065 | cipher->cupdate = OSSL_get_OP_cipher_update(fns); | |
1066 | fnciphcnt++; | |
1067 | break; | |
1068 | case OSSL_FUNC_CIPHER_FINAL: | |
1069 | if (cipher->cfinal != NULL) | |
1070 | break; | |
1071 | cipher->cfinal = OSSL_get_OP_cipher_final(fns); | |
1072 | fnciphcnt++; | |
1073 | break; | |
718b133a MC |
1074 | case OSSL_FUNC_CIPHER_CIPHER: |
1075 | if (cipher->ccipher != NULL) | |
1076 | break; | |
1077 | cipher->ccipher = OSSL_get_OP_cipher_cipher(fns); | |
1078 | break; | |
df05f2ce MC |
1079 | case OSSL_FUNC_CIPHER_FREECTX: |
1080 | if (cipher->freectx != NULL) | |
1081 | break; | |
1082 | cipher->freectx = OSSL_get_OP_cipher_freectx(fns); | |
1083 | fnctxcnt++; | |
1084 | break; | |
1085 | case OSSL_FUNC_CIPHER_DUPCTX: | |
1086 | if (cipher->dupctx != NULL) | |
1087 | break; | |
1088 | cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns); | |
1089 | break; | |
1090 | case OSSL_FUNC_CIPHER_KEY_LENGTH: | |
1091 | if (cipher->key_length != NULL) | |
1092 | break; | |
1093 | cipher->key_length = OSSL_get_OP_cipher_key_length(fns); | |
1094 | break; | |
718b133a MC |
1095 | case OSSL_FUNC_CIPHER_IV_LENGTH: |
1096 | if (cipher->iv_length != NULL) | |
1097 | break; | |
1098 | cipher->iv_length = OSSL_get_OP_cipher_iv_length(fns); | |
1099 | break; | |
1100 | case OSSL_FUNC_CIPHER_BLOCK_SIZE: | |
1101 | if (cipher->blocksize != NULL) | |
1102 | break; | |
1103 | cipher->blocksize = OSSL_get_OP_cipher_block_size(fns); | |
1104 | break; | |
df05f2ce MC |
1105 | case OSSL_FUNC_CIPHER_GET_PARAMS: |
1106 | if (cipher->get_params != NULL) | |
1107 | break; | |
1108 | cipher->get_params = OSSL_get_OP_cipher_get_params(fns); | |
1109 | break; | |
718b133a MC |
1110 | case OSSL_FUNC_CIPHER_CTX_GET_PARAMS: |
1111 | if (cipher->ctx_get_params != NULL) | |
1112 | break; | |
1113 | cipher->ctx_get_params = OSSL_get_OP_cipher_ctx_get_params(fns); | |
1114 | break; | |
1115 | case OSSL_FUNC_CIPHER_CTX_SET_PARAMS: | |
1116 | if (cipher->ctx_set_params != NULL) | |
df05f2ce | 1117 | break; |
718b133a | 1118 | cipher->ctx_set_params = OSSL_get_OP_cipher_ctx_set_params(fns); |
df05f2ce MC |
1119 | break; |
1120 | } | |
1121 | } | |
718b133a MC |
1122 | if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4) |
1123 | || (fnciphcnt == 0 && cipher->ccipher == NULL) | |
dcd446f1 MC |
1124 | || fnctxcnt != 2 |
1125 | || cipher->blocksize == NULL | |
1126 | || cipher->iv_length == NULL | |
1127 | || cipher->key_length == NULL) { | |
df05f2ce MC |
1128 | /* |
1129 | * In order to be a consistent set of functions we must have at least | |
1130 | * a complete set of "encrypt" functions, or a complete set of "decrypt" | |
718b133a | 1131 | * functions, or a single "cipher" function. In all cases we need a |
dcd446f1 MC |
1132 | * complete set of context management functions, as well as the |
1133 | * blocksize, iv_length and key_length functions. | |
df05f2ce MC |
1134 | */ |
1135 | EVP_CIPHER_meth_free(cipher); | |
1136 | EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS); | |
1137 | return NULL; | |
1138 | } | |
1139 | cipher->prov = prov; | |
1140 | if (prov != NULL) | |
1141 | ossl_provider_upref(prov); | |
1142 | ||
1143 | return cipher; | |
1144 | } | |
1145 | ||
1146 | static int evp_cipher_upref(void *cipher) | |
1147 | { | |
1148 | return EVP_CIPHER_upref(cipher); | |
1149 | } | |
1150 | ||
1151 | static void evp_cipher_free(void *cipher) | |
1152 | { | |
1153 | EVP_CIPHER_meth_free(cipher); | |
1154 | } | |
1155 | ||
1156 | static int evp_cipher_nid(void *vcipher) | |
1157 | { | |
1158 | EVP_CIPHER *cipher = vcipher; | |
1159 | ||
1160 | return cipher->nid; | |
1161 | } | |
1162 | ||
1163 | EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm, | |
1164 | const char *properties) | |
1165 | { | |
1166 | return evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties, | |
1167 | evp_cipher_from_dispatch, evp_cipher_upref, | |
1168 | evp_cipher_free, evp_cipher_nid); | |
1169 | } |