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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: | |
aab26e6f | 151 | break; |
df05f2ce MC |
152 | default: |
153 | goto legacy; | |
154 | } | |
155 | } | |
156 | ||
157 | /* | |
158 | * Ensure a context left lying around from last time is cleared | |
159 | * (legacy code) | |
160 | */ | |
161 | if (cipher != NULL && ctx->cipher != NULL) { | |
162 | OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size); | |
163 | ctx->cipher_data = NULL; | |
164 | } | |
165 | ||
166 | ||
167 | /* TODO(3.0): Start of non-legacy code below */ | |
168 | ||
169 | /* Ensure a context left lying around from last time is cleared */ | |
170 | if (cipher != NULL && ctx->cipher != NULL) { | |
171 | unsigned long flags = ctx->flags; | |
172 | ||
173 | EVP_CIPHER_CTX_reset(ctx); | |
174 | /* Restore encrypt and flags */ | |
175 | ctx->encrypt = enc; | |
176 | ctx->flags = flags; | |
177 | } | |
178 | ||
179 | if (cipher != NULL) | |
180 | ctx->cipher = cipher; | |
181 | else | |
182 | cipher = ctx->cipher; | |
183 | ||
184 | if (cipher->prov == NULL) { | |
185 | provciph = EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), ""); | |
186 | if (provciph == NULL) { | |
187 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
188 | return 0; | |
189 | } | |
190 | cipher = provciph; | |
191 | EVP_CIPHER_meth_free(ctx->fetched_cipher); | |
192 | ctx->fetched_cipher = provciph; | |
193 | } | |
194 | ||
195 | ctx->cipher = cipher; | |
196 | if (ctx->provctx == NULL) { | |
197 | ctx->provctx = ctx->cipher->newctx(); | |
198 | if (ctx->provctx == NULL) { | |
199 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
200 | return 0; | |
201 | } | |
202 | } | |
203 | ||
204 | if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) { | |
0f113f3e | 205 | /* |
df05f2ce MC |
206 | * If this ctx was already set up for no padding then we need to tell |
207 | * the new cipher about it. | |
208 | */ | |
209 | if (!EVP_CIPHER_CTX_set_padding(ctx, 0)) | |
210 | return 0; | |
211 | } | |
212 | ||
718b133a MC |
213 | switch (EVP_CIPHER_mode(ctx->cipher)) { |
214 | case EVP_CIPH_CFB_MODE: | |
215 | case EVP_CIPH_OFB_MODE: | |
216 | case EVP_CIPH_CBC_MODE: | |
217 | /* For these modes we remember the original IV for later use */ | |
218 | if (!ossl_assert(EVP_CIPHER_CTX_iv_length(ctx) <= (int)sizeof(ctx->oiv))) { | |
219 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
220 | return 0; | |
221 | } | |
222 | if (iv != NULL) | |
223 | memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
224 | } | |
225 | ||
df05f2ce MC |
226 | if (enc) { |
227 | if (ctx->cipher->einit == NULL) { | |
228 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
229 | return 0; | |
230 | } | |
231 | ||
232 | return ctx->cipher->einit(ctx->provctx, key, iv); | |
233 | } | |
234 | ||
235 | if (ctx->cipher->dinit == NULL) { | |
236 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
237 | return 0; | |
238 | } | |
239 | ||
240 | return ctx->cipher->dinit(ctx->provctx, key, iv); | |
241 | ||
242 | /* TODO(3.0): Remove legacy code below */ | |
243 | legacy: | |
244 | ||
245 | if (cipher != NULL) { | |
246 | /* | |
247 | * Ensure a context left lying around from last time is cleared (we | |
248 | * previously attempted to avoid this if the same ENGINE and | |
0f113f3e MC |
249 | * EVP_CIPHER could be used). |
250 | */ | |
251 | if (ctx->cipher) { | |
252 | unsigned long flags = ctx->flags; | |
c0ca39bd | 253 | EVP_CIPHER_CTX_reset(ctx); |
0f113f3e MC |
254 | /* Restore encrypt and flags */ |
255 | ctx->encrypt = enc; | |
256 | ctx->flags = flags; | |
257 | } | |
0b13e9f0 | 258 | #ifndef OPENSSL_NO_ENGINE |
df05f2ce | 259 | if (impl != NULL) { |
0f113f3e MC |
260 | if (!ENGINE_init(impl)) { |
261 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
262 | return 0; | |
263 | } | |
df05f2ce MC |
264 | } else { |
265 | impl = tmpimpl; | |
266 | } | |
267 | if (impl != NULL) { | |
0f113f3e MC |
268 | /* There's an ENGINE for this job ... (apparently) */ |
269 | const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid); | |
df05f2ce MC |
270 | |
271 | if (c == NULL) { | |
0f113f3e MC |
272 | /* |
273 | * One positive side-effect of US's export control history, | |
274 | * is that we should at least be able to avoid using US | |
0d4fb843 | 275 | * misspellings of "initialisation"? |
0f113f3e MC |
276 | */ |
277 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
278 | return 0; | |
279 | } | |
280 | /* We'll use the ENGINE's private cipher definition */ | |
281 | cipher = c; | |
282 | /* | |
283 | * Store the ENGINE functional reference so we know 'cipher' came | |
284 | * from an ENGINE and we need to release it when done. | |
285 | */ | |
286 | ctx->engine = impl; | |
df05f2ce | 287 | } else { |
0f113f3e | 288 | ctx->engine = NULL; |
df05f2ce | 289 | } |
0b13e9f0 | 290 | #endif |
544a2aea | 291 | |
0f113f3e MC |
292 | ctx->cipher = cipher; |
293 | if (ctx->cipher->ctx_size) { | |
b51bce94 | 294 | ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size); |
90945fa3 | 295 | if (ctx->cipher_data == NULL) { |
273a0218 | 296 | ctx->cipher = NULL; |
0f113f3e MC |
297 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); |
298 | return 0; | |
299 | } | |
300 | } else { | |
301 | ctx->cipher_data = NULL; | |
302 | } | |
303 | ctx->key_len = cipher->key_len; | |
304 | /* Preserve wrap enable flag, zero everything else */ | |
305 | ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW; | |
306 | if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { | |
307 | if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { | |
273a0218 | 308 | ctx->cipher = NULL; |
0f113f3e MC |
309 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); |
310 | return 0; | |
311 | } | |
312 | } | |
0f113f3e | 313 | } |
0b13e9f0 | 314 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e | 315 | skip_to_init: |
0b13e9f0 | 316 | #endif |
0f113f3e MC |
317 | /* we assume block size is a power of 2 in *cryptUpdate */ |
318 | OPENSSL_assert(ctx->cipher->block_size == 1 | |
319 | || ctx->cipher->block_size == 8 | |
320 | || ctx->cipher->block_size == 16); | |
321 | ||
322 | if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW) | |
323 | && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) { | |
324 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED); | |
325 | return 0; | |
326 | } | |
327 | ||
480d3323 | 328 | if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) { |
0f113f3e MC |
329 | switch (EVP_CIPHER_CTX_mode(ctx)) { |
330 | ||
331 | case EVP_CIPH_STREAM_CIPHER: | |
332 | case EVP_CIPH_ECB_MODE: | |
333 | break; | |
334 | ||
335 | case EVP_CIPH_CFB_MODE: | |
336 | case EVP_CIPH_OFB_MODE: | |
337 | ||
338 | ctx->num = 0; | |
339 | /* fall-through */ | |
340 | ||
341 | case EVP_CIPH_CBC_MODE: | |
342 | ||
343 | OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= | |
344 | (int)sizeof(ctx->iv)); | |
345 | if (iv) | |
346 | memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
347 | memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); | |
348 | break; | |
349 | ||
350 | case EVP_CIPH_CTR_MODE: | |
351 | ctx->num = 0; | |
352 | /* Don't reuse IV for CTR mode */ | |
353 | if (iv) | |
354 | memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
355 | break; | |
356 | ||
357 | default: | |
358 | return 0; | |
0f113f3e MC |
359 | } |
360 | } | |
361 | ||
362 | if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { | |
363 | if (!ctx->cipher->init(ctx, key, iv, enc)) | |
364 | return 0; | |
365 | } | |
366 | ctx->buf_len = 0; | |
367 | ctx->final_used = 0; | |
368 | ctx->block_mask = ctx->cipher->block_size - 1; | |
369 | return 1; | |
370 | } | |
d02b48c6 | 371 | |
be06a934 | 372 | int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
373 | const unsigned char *in, int inl) |
374 | { | |
375 | if (ctx->encrypt) | |
376 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
377 | else | |
378 | return EVP_DecryptUpdate(ctx, out, outl, in, inl); | |
379 | } | |
d02b48c6 | 380 | |
581f1c84 | 381 | int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
382 | { |
383 | if (ctx->encrypt) | |
384 | return EVP_EncryptFinal_ex(ctx, out, outl); | |
385 | else | |
386 | return EVP_DecryptFinal_ex(ctx, out, outl); | |
387 | } | |
581f1c84 | 388 | |
6b691a5c | 389 | int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
390 | { |
391 | if (ctx->encrypt) | |
392 | return EVP_EncryptFinal(ctx, out, outl); | |
393 | else | |
394 | return EVP_DecryptFinal(ctx, out, outl); | |
395 | } | |
d02b48c6 | 396 | |
be06a934 | 397 | int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
398 | const unsigned char *key, const unsigned char *iv) |
399 | { | |
400 | return EVP_CipherInit(ctx, cipher, key, iv, 1); | |
401 | } | |
18eda732 | 402 | |
0f113f3e MC |
403 | int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
404 | ENGINE *impl, const unsigned char *key, | |
405 | const unsigned char *iv) | |
406 | { | |
407 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); | |
408 | } | |
d02b48c6 | 409 | |
be06a934 | 410 | int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
411 | const unsigned char *key, const unsigned char *iv) |
412 | { | |
413 | return EVP_CipherInit(ctx, cipher, key, iv, 0); | |
414 | } | |
18eda732 | 415 | |
0f113f3e MC |
416 | int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
417 | ENGINE *impl, const unsigned char *key, | |
418 | const unsigned char *iv) | |
419 | { | |
420 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); | |
421 | } | |
d02b48c6 | 422 | |
c3a73daf AP |
423 | /* |
424 | * According to the letter of standard difference between pointers | |
425 | * is specified to be valid only within same object. This makes | |
426 | * it formally challenging to determine if input and output buffers | |
427 | * are not partially overlapping with standard pointer arithmetic. | |
428 | */ | |
429 | #ifdef PTRDIFF_T | |
430 | # undef PTRDIFF_T | |
431 | #endif | |
432 | #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64 | |
433 | /* | |
434 | * Then we have VMS that distinguishes itself by adhering to | |
5fc77684 AP |
435 | * sizeof(size_t)==4 even in 64-bit builds, which means that |
436 | * difference between two pointers might be truncated to 32 bits. | |
437 | * In the context one can even wonder how comparison for | |
438 | * equality is implemented. To be on the safe side we adhere to | |
439 | * PTRDIFF_T even for comparison for equality. | |
c3a73daf AP |
440 | */ |
441 | # define PTRDIFF_T uint64_t | |
442 | #else | |
443 | # define PTRDIFF_T size_t | |
444 | #endif | |
445 | ||
7141ba31 | 446 | int is_partially_overlapping(const void *ptr1, const void *ptr2, int len) |
c3a73daf AP |
447 | { |
448 | PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2; | |
449 | /* | |
450 | * Check for partially overlapping buffers. [Binary logical | |
451 | * operations are used instead of boolean to minimize number | |
452 | * of conditional branches.] | |
453 | */ | |
83151b73 AP |
454 | int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) | |
455 | (diff > (0 - (PTRDIFF_T)len))); | |
b153f092 | 456 | |
83151b73 | 457 | return overlapped; |
c3a73daf AP |
458 | } |
459 | ||
a8bf2f8f RL |
460 | static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx, |
461 | unsigned char *out, int *outl, | |
462 | const unsigned char *in, int inl) | |
0f113f3e | 463 | { |
64846096 LP |
464 | int i, j, bl, cmpl = inl; |
465 | ||
466 | if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS)) | |
467 | cmpl = (cmpl + 7) / 8; | |
0f113f3e | 468 | |
7141ba31 MC |
469 | bl = ctx->cipher->block_size; |
470 | ||
dcb982d7 RL |
471 | if (inl <= 0) { |
472 | *outl = 0; | |
473 | return inl == 0; | |
474 | } | |
475 | ||
0f113f3e | 476 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
7141ba31 | 477 | /* If block size > 1 then the cipher will have to do this check */ |
64846096 | 478 | if (bl == 1 && is_partially_overlapping(out, in, cmpl)) { |
a8bf2f8f | 479 | EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); |
5fc77684 | 480 | return 0; |
83151b73 | 481 | } |
5fc77684 | 482 | |
0f113f3e MC |
483 | i = ctx->cipher->do_cipher(ctx, out, in, inl); |
484 | if (i < 0) | |
485 | return 0; | |
486 | else | |
487 | *outl = i; | |
488 | return 1; | |
489 | } | |
490 | ||
64846096 | 491 | if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) { |
a8bf2f8f | 492 | EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); |
5fc77684 | 493 | return 0; |
83151b73 | 494 | } |
0f113f3e MC |
495 | |
496 | if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) { | |
497 | if (ctx->cipher->do_cipher(ctx, out, in, inl)) { | |
498 | *outl = inl; | |
499 | return 1; | |
500 | } else { | |
501 | *outl = 0; | |
502 | return 0; | |
503 | } | |
504 | } | |
505 | i = ctx->buf_len; | |
0f113f3e MC |
506 | OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); |
507 | if (i != 0) { | |
3f358213 | 508 | if (bl - i > inl) { |
0f113f3e MC |
509 | memcpy(&(ctx->buf[i]), in, inl); |
510 | ctx->buf_len += inl; | |
511 | *outl = 0; | |
512 | return 1; | |
513 | } else { | |
514 | j = bl - i; | |
515 | memcpy(&(ctx->buf[i]), in, j); | |
0f113f3e MC |
516 | inl -= j; |
517 | in += j; | |
5fc77684 AP |
518 | if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl)) |
519 | return 0; | |
0f113f3e MC |
520 | out += bl; |
521 | *outl = bl; | |
522 | } | |
523 | } else | |
524 | *outl = 0; | |
525 | i = inl & (bl - 1); | |
526 | inl -= i; | |
527 | if (inl > 0) { | |
528 | if (!ctx->cipher->do_cipher(ctx, out, in, inl)) | |
529 | return 0; | |
530 | *outl += inl; | |
531 | } | |
532 | ||
533 | if (i != 0) | |
534 | memcpy(ctx->buf, &(in[inl]), i); | |
535 | ctx->buf_len = i; | |
536 | return 1; | |
537 | } | |
d02b48c6 | 538 | |
a8bf2f8f RL |
539 | |
540 | int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, | |
541 | const unsigned char *in, int inl) | |
542 | { | |
df05f2ce MC |
543 | int ret; |
544 | size_t soutl; | |
545 | ||
a8bf2f8f RL |
546 | /* Prevent accidental use of decryption context when encrypting */ |
547 | if (!ctx->encrypt) { | |
548 | EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION); | |
549 | return 0; | |
550 | } | |
551 | ||
df05f2ce MC |
552 | if (ctx->cipher == NULL || ctx->cipher->prov == NULL) |
553 | goto legacy; | |
554 | ||
555 | if (ctx->cipher->cupdate == NULL) { | |
556 | EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR); | |
557 | return 0; | |
558 | } | |
559 | ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl, in, (size_t)inl); | |
560 | ||
561 | if (soutl > INT_MAX) { | |
562 | EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR); | |
563 | return 0; | |
564 | } | |
565 | *outl = soutl; | |
566 | return ret; | |
567 | ||
568 | /* TODO(3.0): Remove legacy code below */ | |
569 | legacy: | |
570 | ||
a8bf2f8f RL |
571 | return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl); |
572 | } | |
573 | ||
be06a934 | 574 | int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
575 | { |
576 | int ret; | |
577 | ret = EVP_EncryptFinal_ex(ctx, out, outl); | |
578 | return ret; | |
579 | } | |
581f1c84 DSH |
580 | |
581 | int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
0f113f3e MC |
582 | { |
583 | int n, ret; | |
584 | unsigned int i, b, bl; | |
df05f2ce | 585 | size_t soutl; |
0f113f3e | 586 | |
a8bf2f8f RL |
587 | /* Prevent accidental use of decryption context when encrypting */ |
588 | if (!ctx->encrypt) { | |
589 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION); | |
590 | return 0; | |
591 | } | |
592 | ||
df05f2ce MC |
593 | if (ctx->cipher == NULL || ctx->cipher->prov == NULL) |
594 | goto legacy; | |
595 | ||
596 | if (ctx->cipher->cfinal == NULL) { | |
597 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR); | |
598 | return 0; | |
599 | } | |
600 | ||
601 | ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl); | |
602 | ||
603 | if (soutl > INT_MAX) { | |
604 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR); | |
605 | return 0; | |
606 | } | |
607 | *outl = soutl; | |
608 | ||
609 | return ret; | |
610 | ||
611 | /* TODO(3.0): Remove legacy code below */ | |
612 | legacy: | |
613 | ||
0f113f3e MC |
614 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
615 | ret = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
616 | if (ret < 0) | |
617 | return 0; | |
618 | else | |
619 | *outl = ret; | |
620 | return 1; | |
621 | } | |
622 | ||
623 | b = ctx->cipher->block_size; | |
cbe29648 | 624 | OPENSSL_assert(b <= sizeof(ctx->buf)); |
0f113f3e MC |
625 | if (b == 1) { |
626 | *outl = 0; | |
627 | return 1; | |
628 | } | |
629 | bl = ctx->buf_len; | |
630 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
631 | if (bl) { | |
632 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, | |
633 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
634 | return 0; | |
635 | } | |
636 | *outl = 0; | |
637 | return 1; | |
638 | } | |
639 | ||
640 | n = b - bl; | |
641 | for (i = bl; i < b; i++) | |
642 | ctx->buf[i] = n; | |
643 | ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b); | |
644 | ||
645 | if (ret) | |
646 | *outl = b; | |
647 | ||
648 | return ret; | |
649 | } | |
d02b48c6 | 650 | |
be06a934 | 651 | int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
652 | const unsigned char *in, int inl) |
653 | { | |
df05f2ce | 654 | int fix_len, cmpl = inl, ret; |
0f113f3e | 655 | unsigned int b; |
df05f2ce | 656 | size_t soutl; |
0f113f3e | 657 | |
a8bf2f8f RL |
658 | /* Prevent accidental use of encryption context when decrypting */ |
659 | if (ctx->encrypt) { | |
660 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION); | |
661 | return 0; | |
662 | } | |
663 | ||
df05f2ce MC |
664 | if (ctx->cipher == NULL || ctx->cipher->prov == NULL) |
665 | goto legacy; | |
666 | ||
667 | if (ctx->cipher->cupdate == NULL) { | |
668 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR); | |
669 | return 0; | |
670 | } | |
671 | ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl, in, (size_t)inl); | |
672 | ||
673 | if (ret) { | |
674 | if (soutl > INT_MAX) { | |
675 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR); | |
676 | return 0; | |
677 | } | |
678 | *outl = soutl; | |
679 | } | |
680 | ||
681 | return ret; | |
682 | ||
683 | /* TODO(3.0): Remove legacy code below */ | |
684 | legacy: | |
685 | ||
7141ba31 MC |
686 | b = ctx->cipher->block_size; |
687 | ||
64846096 LP |
688 | if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS)) |
689 | cmpl = (cmpl + 7) / 8; | |
690 | ||
dcb982d7 RL |
691 | if (inl <= 0) { |
692 | *outl = 0; | |
693 | return inl == 0; | |
694 | } | |
695 | ||
0f113f3e | 696 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
64846096 | 697 | if (b == 1 && is_partially_overlapping(out, in, cmpl)) { |
83151b73 | 698 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); |
5fc77684 | 699 | return 0; |
83151b73 | 700 | } |
5fc77684 | 701 | |
0f113f3e MC |
702 | fix_len = ctx->cipher->do_cipher(ctx, out, in, inl); |
703 | if (fix_len < 0) { | |
704 | *outl = 0; | |
705 | return 0; | |
706 | } else | |
707 | *outl = fix_len; | |
708 | return 1; | |
709 | } | |
710 | ||
0f113f3e | 711 | if (ctx->flags & EVP_CIPH_NO_PADDING) |
a8bf2f8f | 712 | return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl); |
0f113f3e | 713 | |
cbe29648 | 714 | OPENSSL_assert(b <= sizeof(ctx->final)); |
0f113f3e MC |
715 | |
716 | if (ctx->final_used) { | |
5fc77684 AP |
717 | /* see comment about PTRDIFF_T comparison above */ |
718 | if (((PTRDIFF_T)out == (PTRDIFF_T)in) | |
83151b73 AP |
719 | || is_partially_overlapping(out, in, b)) { |
720 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); | |
5fc77684 | 721 | return 0; |
83151b73 | 722 | } |
0f113f3e MC |
723 | memcpy(out, ctx->final, b); |
724 | out += b; | |
725 | fix_len = 1; | |
726 | } else | |
727 | fix_len = 0; | |
728 | ||
a8bf2f8f | 729 | if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl)) |
0f113f3e MC |
730 | return 0; |
731 | ||
732 | /* | |
733 | * if we have 'decrypted' a multiple of block size, make sure we have a | |
734 | * copy of this last block | |
735 | */ | |
736 | if (b > 1 && !ctx->buf_len) { | |
737 | *outl -= b; | |
738 | ctx->final_used = 1; | |
739 | memcpy(ctx->final, &out[*outl], b); | |
740 | } else | |
741 | ctx->final_used = 0; | |
742 | ||
743 | if (fix_len) | |
744 | *outl += b; | |
745 | ||
746 | return 1; | |
747 | } | |
d02b48c6 | 748 | |
6b691a5c | 749 | int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
750 | { |
751 | int ret; | |
752 | ret = EVP_DecryptFinal_ex(ctx, out, outl); | |
753 | return ret; | |
754 | } | |
581f1c84 DSH |
755 | |
756 | int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
0f113f3e MC |
757 | { |
758 | int i, n; | |
759 | unsigned int b; | |
df05f2ce MC |
760 | size_t soutl; |
761 | int ret; | |
a8bf2f8f RL |
762 | |
763 | /* Prevent accidental use of encryption context when decrypting */ | |
764 | if (ctx->encrypt) { | |
765 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION); | |
766 | return 0; | |
767 | } | |
768 | ||
df05f2ce MC |
769 | if (ctx->cipher == NULL || ctx->cipher->prov == NULL) |
770 | goto legacy; | |
771 | ||
772 | if (ctx->cipher->cfinal == NULL) { | |
773 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR); | |
774 | return 0; | |
775 | } | |
776 | ||
777 | ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl); | |
778 | ||
779 | if (ret) { | |
780 | if (soutl > INT_MAX) { | |
781 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR); | |
782 | return 0; | |
783 | } | |
784 | *outl = soutl; | |
785 | } | |
786 | ||
787 | return ret; | |
788 | ||
789 | /* TODO(3.0): Remove legacy code below */ | |
790 | legacy: | |
791 | ||
0f113f3e MC |
792 | *outl = 0; |
793 | ||
794 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
795 | i = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
796 | if (i < 0) | |
797 | return 0; | |
798 | else | |
799 | *outl = i; | |
800 | return 1; | |
801 | } | |
802 | ||
803 | b = ctx->cipher->block_size; | |
804 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
805 | if (ctx->buf_len) { | |
806 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, | |
807 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
808 | return 0; | |
809 | } | |
810 | *outl = 0; | |
811 | return 1; | |
812 | } | |
813 | if (b > 1) { | |
814 | if (ctx->buf_len || !ctx->final_used) { | |
815 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH); | |
26a7d938 | 816 | return 0; |
0f113f3e | 817 | } |
cbe29648 | 818 | OPENSSL_assert(b <= sizeof(ctx->final)); |
0f113f3e MC |
819 | |
820 | /* | |
821 | * The following assumes that the ciphertext has been authenticated. | |
822 | * Otherwise it provides a padding oracle. | |
823 | */ | |
824 | n = ctx->final[b - 1]; | |
825 | if (n == 0 || n > (int)b) { | |
826 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
26a7d938 | 827 | return 0; |
0f113f3e MC |
828 | } |
829 | for (i = 0; i < n; i++) { | |
830 | if (ctx->final[--b] != n) { | |
831 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
26a7d938 | 832 | return 0; |
0f113f3e MC |
833 | } |
834 | } | |
835 | n = ctx->cipher->block_size - n; | |
836 | for (i = 0; i < n; i++) | |
837 | out[i] = ctx->final[i]; | |
838 | *outl = n; | |
839 | } else | |
840 | *outl = 0; | |
208fb891 | 841 | return 1; |
0f113f3e | 842 | } |
d02b48c6 | 843 | |
6343829a | 844 | int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) |
0f113f3e MC |
845 | { |
846 | if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) | |
847 | return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); | |
df05f2ce | 848 | if (EVP_CIPHER_CTX_key_length(c) == keylen) |
0f113f3e MC |
849 | return 1; |
850 | if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) { | |
851 | c->key_len = keylen; | |
852 | return 1; | |
853 | } | |
854 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH); | |
855 | return 0; | |
856 | } | |
49528751 | 857 | |
f2e5ca84 | 858 | int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) |
0f113f3e MC |
859 | { |
860 | if (pad) | |
861 | ctx->flags &= ~EVP_CIPH_NO_PADDING; | |
862 | else | |
863 | ctx->flags |= EVP_CIPH_NO_PADDING; | |
df05f2ce MC |
864 | |
865 | if (ctx->cipher != NULL && ctx->cipher->prov != NULL) { | |
866 | OSSL_PARAM params[] = { | |
867 | OSSL_PARAM_int(OSSL_CIPHER_PARAM_PADDING, NULL), | |
868 | OSSL_PARAM_END | |
869 | }; | |
870 | ||
871 | params[0].data = &pad; | |
872 | ||
718b133a | 873 | if (ctx->cipher->ctx_set_params == NULL) { |
df05f2ce MC |
874 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_PADDING, EVP_R_CTRL_NOT_IMPLEMENTED); |
875 | return 0; | |
876 | } | |
877 | ||
718b133a | 878 | if (!ctx->cipher->ctx_set_params(ctx->provctx, params)) |
df05f2ce MC |
879 | return 0; |
880 | } | |
881 | ||
0f113f3e MC |
882 | return 1; |
883 | } | |
f2e5ca84 | 884 | |
49528751 DSH |
885 | int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) |
886 | { | |
0f113f3e | 887 | int ret; |
d91f4568 | 888 | |
0f113f3e MC |
889 | if (!ctx->cipher) { |
890 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); | |
891 | return 0; | |
892 | } | |
893 | ||
894 | if (!ctx->cipher->ctrl) { | |
895 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); | |
896 | return 0; | |
897 | } | |
898 | ||
899 | ret = ctx->cipher->ctrl(ctx, type, arg, ptr); | |
900 | if (ret == -1) { | |
901 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, | |
902 | EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); | |
903 | return 0; | |
904 | } | |
905 | return ret; | |
49528751 | 906 | } |
216659eb DSH |
907 | |
908 | int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) | |
0f113f3e MC |
909 | { |
910 | if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) | |
911 | return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); | |
4cffafe9 | 912 | if (RAND_priv_bytes(key, ctx->key_len) <= 0) |
0f113f3e MC |
913 | return 0; |
914 | return 1; | |
915 | } | |
216659eb | 916 | |
c2bf7208 | 917 | int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) |
0f113f3e MC |
918 | { |
919 | if ((in == NULL) || (in->cipher == NULL)) { | |
920 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED); | |
921 | return 0; | |
922 | } | |
df05f2ce MC |
923 | |
924 | if (in->cipher->prov == NULL) | |
925 | goto legacy; | |
926 | ||
927 | if (in->cipher->dupctx == NULL) { | |
928 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX); | |
929 | return 0; | |
930 | } | |
931 | ||
932 | EVP_CIPHER_CTX_reset(out); | |
933 | ||
934 | *out = *in; | |
935 | out->provctx = NULL; | |
936 | ||
718b133a | 937 | if (in->fetched_cipher != NULL && !EVP_CIPHER_upref(in->fetched_cipher)) { |
df05f2ce MC |
938 | out->fetched_cipher = NULL; |
939 | return 0; | |
940 | } | |
941 | ||
942 | out->provctx = in->cipher->dupctx(in->provctx); | |
943 | if (out->provctx == NULL) { | |
944 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX); | |
945 | return 0; | |
946 | } | |
947 | ||
948 | return 1; | |
949 | ||
950 | /* TODO(3.0): Remove legacy code below */ | |
951 | legacy: | |
952 | ||
c2bf7208 | 953 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
954 | /* Make sure it's safe to copy a cipher context using an ENGINE */ |
955 | if (in->engine && !ENGINE_init(in->engine)) { | |
956 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB); | |
957 | return 0; | |
958 | } | |
c2bf7208 DSH |
959 | #endif |
960 | ||
c0ca39bd | 961 | EVP_CIPHER_CTX_reset(out); |
b4faea50 | 962 | memcpy(out, in, sizeof(*out)); |
0f113f3e MC |
963 | |
964 | if (in->cipher_data && in->cipher->ctx_size) { | |
965 | out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size); | |
90945fa3 | 966 | if (out->cipher_data == NULL) { |
273a0218 | 967 | out->cipher = NULL; |
0f113f3e MC |
968 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE); |
969 | return 0; | |
970 | } | |
971 | memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size); | |
972 | } | |
973 | ||
974 | if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) | |
273a0218 BE |
975 | if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) { |
976 | out->cipher = NULL; | |
977 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR); | |
978 | return 0; | |
979 | } | |
0f113f3e MC |
980 | return 1; |
981 | } | |
df05f2ce MC |
982 | |
983 | static void *evp_cipher_from_dispatch(int nid, const OSSL_DISPATCH *fns, | |
984 | OSSL_PROVIDER *prov) | |
985 | { | |
986 | EVP_CIPHER *cipher = NULL; | |
987 | int fnciphcnt = 0, fnctxcnt = 0; | |
988 | ||
989 | if ((cipher = EVP_CIPHER_meth_new(nid, 0, 0)) == NULL) | |
990 | return NULL; | |
991 | ||
992 | for (; fns->function_id != 0; fns++) { | |
993 | switch (fns->function_id) { | |
994 | case OSSL_FUNC_CIPHER_NEWCTX: | |
995 | if (cipher->newctx != NULL) | |
996 | break; | |
997 | cipher->newctx = OSSL_get_OP_cipher_newctx(fns); | |
998 | fnctxcnt++; | |
999 | break; | |
1000 | case OSSL_FUNC_CIPHER_ENCRYPT_INIT: | |
1001 | if (cipher->einit != NULL) | |
1002 | break; | |
1003 | cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns); | |
1004 | fnciphcnt++; | |
1005 | break; | |
1006 | case OSSL_FUNC_CIPHER_DECRYPT_INIT: | |
1007 | if (cipher->dinit != NULL) | |
1008 | break; | |
1009 | cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns); | |
1010 | fnciphcnt++; | |
1011 | break; | |
1012 | case OSSL_FUNC_CIPHER_UPDATE: | |
1013 | if (cipher->cupdate != NULL) | |
1014 | break; | |
1015 | cipher->cupdate = OSSL_get_OP_cipher_update(fns); | |
1016 | fnciphcnt++; | |
1017 | break; | |
1018 | case OSSL_FUNC_CIPHER_FINAL: | |
1019 | if (cipher->cfinal != NULL) | |
1020 | break; | |
1021 | cipher->cfinal = OSSL_get_OP_cipher_final(fns); | |
1022 | fnciphcnt++; | |
1023 | break; | |
718b133a MC |
1024 | case OSSL_FUNC_CIPHER_CIPHER: |
1025 | if (cipher->ccipher != NULL) | |
1026 | break; | |
1027 | cipher->ccipher = OSSL_get_OP_cipher_cipher(fns); | |
1028 | break; | |
df05f2ce MC |
1029 | case OSSL_FUNC_CIPHER_FREECTX: |
1030 | if (cipher->freectx != NULL) | |
1031 | break; | |
1032 | cipher->freectx = OSSL_get_OP_cipher_freectx(fns); | |
1033 | fnctxcnt++; | |
1034 | break; | |
1035 | case OSSL_FUNC_CIPHER_DUPCTX: | |
1036 | if (cipher->dupctx != NULL) | |
1037 | break; | |
1038 | cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns); | |
1039 | break; | |
1040 | case OSSL_FUNC_CIPHER_KEY_LENGTH: | |
1041 | if (cipher->key_length != NULL) | |
1042 | break; | |
1043 | cipher->key_length = OSSL_get_OP_cipher_key_length(fns); | |
1044 | break; | |
718b133a MC |
1045 | case OSSL_FUNC_CIPHER_IV_LENGTH: |
1046 | if (cipher->iv_length != NULL) | |
1047 | break; | |
1048 | cipher->iv_length = OSSL_get_OP_cipher_iv_length(fns); | |
1049 | break; | |
1050 | case OSSL_FUNC_CIPHER_BLOCK_SIZE: | |
1051 | if (cipher->blocksize != NULL) | |
1052 | break; | |
1053 | cipher->blocksize = OSSL_get_OP_cipher_block_size(fns); | |
1054 | break; | |
df05f2ce MC |
1055 | case OSSL_FUNC_CIPHER_GET_PARAMS: |
1056 | if (cipher->get_params != NULL) | |
1057 | break; | |
1058 | cipher->get_params = OSSL_get_OP_cipher_get_params(fns); | |
1059 | break; | |
718b133a MC |
1060 | case OSSL_FUNC_CIPHER_CTX_GET_PARAMS: |
1061 | if (cipher->ctx_get_params != NULL) | |
1062 | break; | |
1063 | cipher->ctx_get_params = OSSL_get_OP_cipher_ctx_get_params(fns); | |
1064 | break; | |
1065 | case OSSL_FUNC_CIPHER_CTX_SET_PARAMS: | |
1066 | if (cipher->ctx_set_params != NULL) | |
df05f2ce | 1067 | break; |
718b133a | 1068 | cipher->ctx_set_params = OSSL_get_OP_cipher_ctx_set_params(fns); |
df05f2ce MC |
1069 | break; |
1070 | } | |
1071 | } | |
718b133a MC |
1072 | if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4) |
1073 | || (fnciphcnt == 0 && cipher->ccipher == NULL) | |
df05f2ce MC |
1074 | || fnctxcnt != 2) { |
1075 | /* | |
1076 | * In order to be a consistent set of functions we must have at least | |
1077 | * a complete set of "encrypt" functions, or a complete set of "decrypt" | |
718b133a MC |
1078 | * functions, or a single "cipher" function. In all cases we need a |
1079 | * complete set of context management functions | |
df05f2ce MC |
1080 | */ |
1081 | EVP_CIPHER_meth_free(cipher); | |
1082 | EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS); | |
1083 | return NULL; | |
1084 | } | |
1085 | cipher->prov = prov; | |
1086 | if (prov != NULL) | |
1087 | ossl_provider_upref(prov); | |
1088 | ||
1089 | return cipher; | |
1090 | } | |
1091 | ||
1092 | static int evp_cipher_upref(void *cipher) | |
1093 | { | |
1094 | return EVP_CIPHER_upref(cipher); | |
1095 | } | |
1096 | ||
1097 | static void evp_cipher_free(void *cipher) | |
1098 | { | |
1099 | EVP_CIPHER_meth_free(cipher); | |
1100 | } | |
1101 | ||
1102 | static int evp_cipher_nid(void *vcipher) | |
1103 | { | |
1104 | EVP_CIPHER *cipher = vcipher; | |
1105 | ||
1106 | return cipher->nid; | |
1107 | } | |
1108 | ||
1109 | EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm, | |
1110 | const char *properties) | |
1111 | { | |
1112 | return evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties, | |
1113 | evp_cipher_from_dispatch, evp_cipher_upref, | |
1114 | evp_cipher_free, evp_cipher_nid); | |
1115 | } |