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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: | |
aab26e6f | 148 | break; |
df05f2ce MC |
149 | default: |
150 | goto legacy; | |
151 | } | |
152 | } | |
153 | ||
154 | /* | |
155 | * Ensure a context left lying around from last time is cleared | |
156 | * (legacy code) | |
157 | */ | |
158 | if (cipher != NULL && ctx->cipher != NULL) { | |
159 | OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size); | |
160 | ctx->cipher_data = NULL; | |
161 | } | |
162 | ||
163 | ||
164 | /* TODO(3.0): Start of non-legacy code below */ | |
165 | ||
166 | /* Ensure a context left lying around from last time is cleared */ | |
167 | if (cipher != NULL && ctx->cipher != NULL) { | |
168 | unsigned long flags = ctx->flags; | |
169 | ||
170 | EVP_CIPHER_CTX_reset(ctx); | |
171 | /* Restore encrypt and flags */ | |
172 | ctx->encrypt = enc; | |
173 | ctx->flags = flags; | |
174 | } | |
175 | ||
176 | if (cipher != NULL) | |
177 | ctx->cipher = cipher; | |
178 | else | |
179 | cipher = ctx->cipher; | |
180 | ||
181 | if (cipher->prov == NULL) { | |
182 | provciph = EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), ""); | |
183 | if (provciph == NULL) { | |
184 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
185 | return 0; | |
186 | } | |
187 | cipher = provciph; | |
188 | EVP_CIPHER_meth_free(ctx->fetched_cipher); | |
189 | ctx->fetched_cipher = provciph; | |
190 | } | |
191 | ||
192 | ctx->cipher = cipher; | |
193 | if (ctx->provctx == NULL) { | |
194 | ctx->provctx = ctx->cipher->newctx(); | |
195 | if (ctx->provctx == NULL) { | |
196 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
197 | return 0; | |
198 | } | |
199 | } | |
200 | ||
201 | if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) { | |
0f113f3e | 202 | /* |
df05f2ce MC |
203 | * If this ctx was already set up for no padding then we need to tell |
204 | * the new cipher about it. | |
205 | */ | |
206 | if (!EVP_CIPHER_CTX_set_padding(ctx, 0)) | |
207 | return 0; | |
208 | } | |
209 | ||
718b133a MC |
210 | switch (EVP_CIPHER_mode(ctx->cipher)) { |
211 | case EVP_CIPH_CFB_MODE: | |
212 | case EVP_CIPH_OFB_MODE: | |
213 | case EVP_CIPH_CBC_MODE: | |
214 | /* For these modes we remember the original IV for later use */ | |
215 | if (!ossl_assert(EVP_CIPHER_CTX_iv_length(ctx) <= (int)sizeof(ctx->oiv))) { | |
216 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
217 | return 0; | |
218 | } | |
219 | if (iv != NULL) | |
220 | memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
221 | } | |
222 | ||
df05f2ce MC |
223 | if (enc) { |
224 | if (ctx->cipher->einit == NULL) { | |
225 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
226 | return 0; | |
227 | } | |
228 | ||
229 | return ctx->cipher->einit(ctx->provctx, key, iv); | |
230 | } | |
231 | ||
232 | if (ctx->cipher->dinit == NULL) { | |
233 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
234 | return 0; | |
235 | } | |
236 | ||
237 | return ctx->cipher->dinit(ctx->provctx, key, iv); | |
238 | ||
239 | /* TODO(3.0): Remove legacy code below */ | |
240 | legacy: | |
241 | ||
242 | if (cipher != NULL) { | |
243 | /* | |
244 | * Ensure a context left lying around from last time is cleared (we | |
245 | * previously attempted to avoid this if the same ENGINE and | |
0f113f3e MC |
246 | * EVP_CIPHER could be used). |
247 | */ | |
248 | if (ctx->cipher) { | |
249 | unsigned long flags = ctx->flags; | |
c0ca39bd | 250 | EVP_CIPHER_CTX_reset(ctx); |
0f113f3e MC |
251 | /* Restore encrypt and flags */ |
252 | ctx->encrypt = enc; | |
253 | ctx->flags = flags; | |
254 | } | |
0b13e9f0 | 255 | #ifndef OPENSSL_NO_ENGINE |
df05f2ce | 256 | if (impl != NULL) { |
0f113f3e MC |
257 | if (!ENGINE_init(impl)) { |
258 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
259 | return 0; | |
260 | } | |
df05f2ce MC |
261 | } else { |
262 | impl = tmpimpl; | |
263 | } | |
264 | if (impl != NULL) { | |
0f113f3e MC |
265 | /* There's an ENGINE for this job ... (apparently) */ |
266 | const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid); | |
df05f2ce MC |
267 | |
268 | if (c == NULL) { | |
0f113f3e MC |
269 | /* |
270 | * One positive side-effect of US's export control history, | |
271 | * is that we should at least be able to avoid using US | |
0d4fb843 | 272 | * misspellings of "initialisation"? |
0f113f3e MC |
273 | */ |
274 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
275 | return 0; | |
276 | } | |
277 | /* We'll use the ENGINE's private cipher definition */ | |
278 | cipher = c; | |
279 | /* | |
280 | * Store the ENGINE functional reference so we know 'cipher' came | |
281 | * from an ENGINE and we need to release it when done. | |
282 | */ | |
283 | ctx->engine = impl; | |
df05f2ce | 284 | } else { |
0f113f3e | 285 | ctx->engine = NULL; |
df05f2ce | 286 | } |
0b13e9f0 | 287 | #endif |
544a2aea | 288 | |
0f113f3e MC |
289 | ctx->cipher = cipher; |
290 | if (ctx->cipher->ctx_size) { | |
b51bce94 | 291 | ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size); |
90945fa3 | 292 | if (ctx->cipher_data == NULL) { |
273a0218 | 293 | ctx->cipher = NULL; |
0f113f3e MC |
294 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); |
295 | return 0; | |
296 | } | |
297 | } else { | |
298 | ctx->cipher_data = NULL; | |
299 | } | |
300 | ctx->key_len = cipher->key_len; | |
301 | /* Preserve wrap enable flag, zero everything else */ | |
302 | ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW; | |
303 | if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { | |
304 | if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { | |
273a0218 | 305 | ctx->cipher = NULL; |
0f113f3e MC |
306 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); |
307 | return 0; | |
308 | } | |
309 | } | |
0f113f3e | 310 | } |
0b13e9f0 | 311 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e | 312 | skip_to_init: |
0b13e9f0 | 313 | #endif |
0f113f3e MC |
314 | /* we assume block size is a power of 2 in *cryptUpdate */ |
315 | OPENSSL_assert(ctx->cipher->block_size == 1 | |
316 | || ctx->cipher->block_size == 8 | |
317 | || ctx->cipher->block_size == 16); | |
318 | ||
319 | if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW) | |
320 | && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) { | |
321 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED); | |
322 | return 0; | |
323 | } | |
324 | ||
480d3323 | 325 | if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) { |
0f113f3e MC |
326 | switch (EVP_CIPHER_CTX_mode(ctx)) { |
327 | ||
328 | case EVP_CIPH_STREAM_CIPHER: | |
329 | case EVP_CIPH_ECB_MODE: | |
330 | break; | |
331 | ||
332 | case EVP_CIPH_CFB_MODE: | |
333 | case EVP_CIPH_OFB_MODE: | |
334 | ||
335 | ctx->num = 0; | |
336 | /* fall-through */ | |
337 | ||
338 | case EVP_CIPH_CBC_MODE: | |
339 | ||
340 | OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= | |
341 | (int)sizeof(ctx->iv)); | |
342 | if (iv) | |
343 | memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
344 | memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); | |
345 | break; | |
346 | ||
347 | case EVP_CIPH_CTR_MODE: | |
348 | ctx->num = 0; | |
349 | /* Don't reuse IV for CTR mode */ | |
350 | if (iv) | |
351 | memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
352 | break; | |
353 | ||
354 | default: | |
355 | return 0; | |
0f113f3e MC |
356 | } |
357 | } | |
358 | ||
359 | if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { | |
360 | if (!ctx->cipher->init(ctx, key, iv, enc)) | |
361 | return 0; | |
362 | } | |
363 | ctx->buf_len = 0; | |
364 | ctx->final_used = 0; | |
365 | ctx->block_mask = ctx->cipher->block_size - 1; | |
366 | return 1; | |
367 | } | |
d02b48c6 | 368 | |
be06a934 | 369 | int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
370 | const unsigned char *in, int inl) |
371 | { | |
372 | if (ctx->encrypt) | |
373 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
374 | else | |
375 | return EVP_DecryptUpdate(ctx, out, outl, in, inl); | |
376 | } | |
d02b48c6 | 377 | |
581f1c84 | 378 | int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
379 | { |
380 | if (ctx->encrypt) | |
381 | return EVP_EncryptFinal_ex(ctx, out, outl); | |
382 | else | |
383 | return EVP_DecryptFinal_ex(ctx, out, outl); | |
384 | } | |
581f1c84 | 385 | |
6b691a5c | 386 | int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
387 | { |
388 | if (ctx->encrypt) | |
389 | return EVP_EncryptFinal(ctx, out, outl); | |
390 | else | |
391 | return EVP_DecryptFinal(ctx, out, outl); | |
392 | } | |
d02b48c6 | 393 | |
be06a934 | 394 | int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
395 | const unsigned char *key, const unsigned char *iv) |
396 | { | |
397 | return EVP_CipherInit(ctx, cipher, key, iv, 1); | |
398 | } | |
18eda732 | 399 | |
0f113f3e MC |
400 | int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
401 | ENGINE *impl, const unsigned char *key, | |
402 | const unsigned char *iv) | |
403 | { | |
404 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); | |
405 | } | |
d02b48c6 | 406 | |
be06a934 | 407 | int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
408 | const unsigned char *key, const unsigned char *iv) |
409 | { | |
410 | return EVP_CipherInit(ctx, cipher, key, iv, 0); | |
411 | } | |
18eda732 | 412 | |
0f113f3e MC |
413 | int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
414 | ENGINE *impl, const unsigned char *key, | |
415 | const unsigned char *iv) | |
416 | { | |
417 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); | |
418 | } | |
d02b48c6 | 419 | |
c3a73daf AP |
420 | /* |
421 | * According to the letter of standard difference between pointers | |
422 | * is specified to be valid only within same object. This makes | |
423 | * it formally challenging to determine if input and output buffers | |
424 | * are not partially overlapping with standard pointer arithmetic. | |
425 | */ | |
426 | #ifdef PTRDIFF_T | |
427 | # undef PTRDIFF_T | |
428 | #endif | |
429 | #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64 | |
430 | /* | |
431 | * Then we have VMS that distinguishes itself by adhering to | |
5fc77684 AP |
432 | * sizeof(size_t)==4 even in 64-bit builds, which means that |
433 | * difference between two pointers might be truncated to 32 bits. | |
434 | * In the context one can even wonder how comparison for | |
435 | * equality is implemented. To be on the safe side we adhere to | |
436 | * PTRDIFF_T even for comparison for equality. | |
c3a73daf AP |
437 | */ |
438 | # define PTRDIFF_T uint64_t | |
439 | #else | |
440 | # define PTRDIFF_T size_t | |
441 | #endif | |
442 | ||
7141ba31 | 443 | int is_partially_overlapping(const void *ptr1, const void *ptr2, int len) |
c3a73daf AP |
444 | { |
445 | PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2; | |
446 | /* | |
447 | * Check for partially overlapping buffers. [Binary logical | |
448 | * operations are used instead of boolean to minimize number | |
449 | * of conditional branches.] | |
450 | */ | |
83151b73 AP |
451 | int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) | |
452 | (diff > (0 - (PTRDIFF_T)len))); | |
b153f092 | 453 | |
83151b73 | 454 | return overlapped; |
c3a73daf AP |
455 | } |
456 | ||
a8bf2f8f RL |
457 | static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx, |
458 | unsigned char *out, int *outl, | |
459 | const unsigned char *in, int inl) | |
0f113f3e | 460 | { |
64846096 LP |
461 | int i, j, bl, cmpl = inl; |
462 | ||
463 | if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS)) | |
464 | cmpl = (cmpl + 7) / 8; | |
0f113f3e | 465 | |
7141ba31 MC |
466 | bl = ctx->cipher->block_size; |
467 | ||
dcb982d7 RL |
468 | if (inl <= 0) { |
469 | *outl = 0; | |
470 | return inl == 0; | |
471 | } | |
472 | ||
0f113f3e | 473 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
7141ba31 | 474 | /* If block size > 1 then the cipher will have to do this check */ |
64846096 | 475 | if (bl == 1 && is_partially_overlapping(out, in, cmpl)) { |
a8bf2f8f | 476 | EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); |
5fc77684 | 477 | return 0; |
83151b73 | 478 | } |
5fc77684 | 479 | |
0f113f3e MC |
480 | i = ctx->cipher->do_cipher(ctx, out, in, inl); |
481 | if (i < 0) | |
482 | return 0; | |
483 | else | |
484 | *outl = i; | |
485 | return 1; | |
486 | } | |
487 | ||
64846096 | 488 | if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) { |
a8bf2f8f | 489 | EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); |
5fc77684 | 490 | return 0; |
83151b73 | 491 | } |
0f113f3e MC |
492 | |
493 | if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) { | |
494 | if (ctx->cipher->do_cipher(ctx, out, in, inl)) { | |
495 | *outl = inl; | |
496 | return 1; | |
497 | } else { | |
498 | *outl = 0; | |
499 | return 0; | |
500 | } | |
501 | } | |
502 | i = ctx->buf_len; | |
0f113f3e MC |
503 | OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); |
504 | if (i != 0) { | |
3f358213 | 505 | if (bl - i > inl) { |
0f113f3e MC |
506 | memcpy(&(ctx->buf[i]), in, inl); |
507 | ctx->buf_len += inl; | |
508 | *outl = 0; | |
509 | return 1; | |
510 | } else { | |
511 | j = bl - i; | |
512 | memcpy(&(ctx->buf[i]), in, j); | |
0f113f3e MC |
513 | inl -= j; |
514 | in += j; | |
5fc77684 AP |
515 | if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl)) |
516 | return 0; | |
0f113f3e MC |
517 | out += bl; |
518 | *outl = bl; | |
519 | } | |
520 | } else | |
521 | *outl = 0; | |
522 | i = inl & (bl - 1); | |
523 | inl -= i; | |
524 | if (inl > 0) { | |
525 | if (!ctx->cipher->do_cipher(ctx, out, in, inl)) | |
526 | return 0; | |
527 | *outl += inl; | |
528 | } | |
529 | ||
530 | if (i != 0) | |
531 | memcpy(ctx->buf, &(in[inl]), i); | |
532 | ctx->buf_len = i; | |
533 | return 1; | |
534 | } | |
d02b48c6 | 535 | |
a8bf2f8f RL |
536 | |
537 | int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, | |
538 | const unsigned char *in, int inl) | |
539 | { | |
df05f2ce MC |
540 | int ret; |
541 | size_t soutl; | |
542 | ||
a8bf2f8f RL |
543 | /* Prevent accidental use of decryption context when encrypting */ |
544 | if (!ctx->encrypt) { | |
545 | EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION); | |
546 | return 0; | |
547 | } | |
548 | ||
df05f2ce MC |
549 | if (ctx->cipher == NULL || ctx->cipher->prov == NULL) |
550 | goto legacy; | |
551 | ||
552 | if (ctx->cipher->cupdate == NULL) { | |
553 | EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR); | |
554 | return 0; | |
555 | } | |
556 | ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl, in, (size_t)inl); | |
557 | ||
558 | if (soutl > INT_MAX) { | |
559 | EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR); | |
560 | return 0; | |
561 | } | |
562 | *outl = soutl; | |
563 | return ret; | |
564 | ||
565 | /* TODO(3.0): Remove legacy code below */ | |
566 | legacy: | |
567 | ||
a8bf2f8f RL |
568 | return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl); |
569 | } | |
570 | ||
be06a934 | 571 | int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
572 | { |
573 | int ret; | |
574 | ret = EVP_EncryptFinal_ex(ctx, out, outl); | |
575 | return ret; | |
576 | } | |
581f1c84 DSH |
577 | |
578 | int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
0f113f3e MC |
579 | { |
580 | int n, ret; | |
581 | unsigned int i, b, bl; | |
df05f2ce | 582 | size_t soutl; |
0f113f3e | 583 | |
a8bf2f8f RL |
584 | /* Prevent accidental use of decryption context when encrypting */ |
585 | if (!ctx->encrypt) { | |
586 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION); | |
587 | return 0; | |
588 | } | |
589 | ||
df05f2ce MC |
590 | if (ctx->cipher == NULL || ctx->cipher->prov == NULL) |
591 | goto legacy; | |
592 | ||
593 | if (ctx->cipher->cfinal == NULL) { | |
594 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR); | |
595 | return 0; | |
596 | } | |
597 | ||
598 | ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl); | |
599 | ||
600 | if (soutl > INT_MAX) { | |
601 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR); | |
602 | return 0; | |
603 | } | |
604 | *outl = soutl; | |
605 | ||
606 | return ret; | |
607 | ||
608 | /* TODO(3.0): Remove legacy code below */ | |
609 | legacy: | |
610 | ||
0f113f3e MC |
611 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
612 | ret = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
613 | if (ret < 0) | |
614 | return 0; | |
615 | else | |
616 | *outl = ret; | |
617 | return 1; | |
618 | } | |
619 | ||
620 | b = ctx->cipher->block_size; | |
cbe29648 | 621 | OPENSSL_assert(b <= sizeof(ctx->buf)); |
0f113f3e MC |
622 | if (b == 1) { |
623 | *outl = 0; | |
624 | return 1; | |
625 | } | |
626 | bl = ctx->buf_len; | |
627 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
628 | if (bl) { | |
629 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, | |
630 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
631 | return 0; | |
632 | } | |
633 | *outl = 0; | |
634 | return 1; | |
635 | } | |
636 | ||
637 | n = b - bl; | |
638 | for (i = bl; i < b; i++) | |
639 | ctx->buf[i] = n; | |
640 | ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b); | |
641 | ||
642 | if (ret) | |
643 | *outl = b; | |
644 | ||
645 | return ret; | |
646 | } | |
d02b48c6 | 647 | |
be06a934 | 648 | int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
649 | const unsigned char *in, int inl) |
650 | { | |
df05f2ce | 651 | int fix_len, cmpl = inl, ret; |
0f113f3e | 652 | unsigned int b; |
df05f2ce | 653 | size_t soutl; |
0f113f3e | 654 | |
a8bf2f8f RL |
655 | /* Prevent accidental use of encryption context when decrypting */ |
656 | if (ctx->encrypt) { | |
657 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION); | |
658 | return 0; | |
659 | } | |
660 | ||
df05f2ce MC |
661 | if (ctx->cipher == NULL || ctx->cipher->prov == NULL) |
662 | goto legacy; | |
663 | ||
664 | if (ctx->cipher->cupdate == NULL) { | |
665 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR); | |
666 | return 0; | |
667 | } | |
668 | ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl, in, (size_t)inl); | |
669 | ||
670 | if (ret) { | |
671 | if (soutl > INT_MAX) { | |
672 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR); | |
673 | return 0; | |
674 | } | |
675 | *outl = soutl; | |
676 | } | |
677 | ||
678 | return ret; | |
679 | ||
680 | /* TODO(3.0): Remove legacy code below */ | |
681 | legacy: | |
682 | ||
7141ba31 MC |
683 | b = ctx->cipher->block_size; |
684 | ||
64846096 LP |
685 | if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS)) |
686 | cmpl = (cmpl + 7) / 8; | |
687 | ||
dcb982d7 RL |
688 | if (inl <= 0) { |
689 | *outl = 0; | |
690 | return inl == 0; | |
691 | } | |
692 | ||
0f113f3e | 693 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
64846096 | 694 | if (b == 1 && is_partially_overlapping(out, in, cmpl)) { |
83151b73 | 695 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); |
5fc77684 | 696 | return 0; |
83151b73 | 697 | } |
5fc77684 | 698 | |
0f113f3e MC |
699 | fix_len = ctx->cipher->do_cipher(ctx, out, in, inl); |
700 | if (fix_len < 0) { | |
701 | *outl = 0; | |
702 | return 0; | |
703 | } else | |
704 | *outl = fix_len; | |
705 | return 1; | |
706 | } | |
707 | ||
0f113f3e | 708 | if (ctx->flags & EVP_CIPH_NO_PADDING) |
a8bf2f8f | 709 | return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl); |
0f113f3e | 710 | |
cbe29648 | 711 | OPENSSL_assert(b <= sizeof(ctx->final)); |
0f113f3e MC |
712 | |
713 | if (ctx->final_used) { | |
5fc77684 AP |
714 | /* see comment about PTRDIFF_T comparison above */ |
715 | if (((PTRDIFF_T)out == (PTRDIFF_T)in) | |
83151b73 AP |
716 | || is_partially_overlapping(out, in, b)) { |
717 | EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); | |
5fc77684 | 718 | return 0; |
83151b73 | 719 | } |
0f113f3e MC |
720 | memcpy(out, ctx->final, b); |
721 | out += b; | |
722 | fix_len = 1; | |
723 | } else | |
724 | fix_len = 0; | |
725 | ||
a8bf2f8f | 726 | if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl)) |
0f113f3e MC |
727 | return 0; |
728 | ||
729 | /* | |
730 | * if we have 'decrypted' a multiple of block size, make sure we have a | |
731 | * copy of this last block | |
732 | */ | |
733 | if (b > 1 && !ctx->buf_len) { | |
734 | *outl -= b; | |
735 | ctx->final_used = 1; | |
736 | memcpy(ctx->final, &out[*outl], b); | |
737 | } else | |
738 | ctx->final_used = 0; | |
739 | ||
740 | if (fix_len) | |
741 | *outl += b; | |
742 | ||
743 | return 1; | |
744 | } | |
d02b48c6 | 745 | |
6b691a5c | 746 | int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
747 | { |
748 | int ret; | |
749 | ret = EVP_DecryptFinal_ex(ctx, out, outl); | |
750 | return ret; | |
751 | } | |
581f1c84 DSH |
752 | |
753 | int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
0f113f3e MC |
754 | { |
755 | int i, n; | |
756 | unsigned int b; | |
df05f2ce MC |
757 | size_t soutl; |
758 | int ret; | |
a8bf2f8f RL |
759 | |
760 | /* Prevent accidental use of encryption context when decrypting */ | |
761 | if (ctx->encrypt) { | |
762 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION); | |
763 | return 0; | |
764 | } | |
765 | ||
df05f2ce MC |
766 | if (ctx->cipher == NULL || ctx->cipher->prov == NULL) |
767 | goto legacy; | |
768 | ||
769 | if (ctx->cipher->cfinal == NULL) { | |
770 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR); | |
771 | return 0; | |
772 | } | |
773 | ||
774 | ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl); | |
775 | ||
776 | if (ret) { | |
777 | if (soutl > INT_MAX) { | |
778 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR); | |
779 | return 0; | |
780 | } | |
781 | *outl = soutl; | |
782 | } | |
783 | ||
784 | return ret; | |
785 | ||
786 | /* TODO(3.0): Remove legacy code below */ | |
787 | legacy: | |
788 | ||
0f113f3e MC |
789 | *outl = 0; |
790 | ||
791 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
792 | i = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
793 | if (i < 0) | |
794 | return 0; | |
795 | else | |
796 | *outl = i; | |
797 | return 1; | |
798 | } | |
799 | ||
800 | b = ctx->cipher->block_size; | |
801 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
802 | if (ctx->buf_len) { | |
803 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, | |
804 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
805 | return 0; | |
806 | } | |
807 | *outl = 0; | |
808 | return 1; | |
809 | } | |
810 | if (b > 1) { | |
811 | if (ctx->buf_len || !ctx->final_used) { | |
812 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH); | |
26a7d938 | 813 | return 0; |
0f113f3e | 814 | } |
cbe29648 | 815 | OPENSSL_assert(b <= sizeof(ctx->final)); |
0f113f3e MC |
816 | |
817 | /* | |
818 | * The following assumes that the ciphertext has been authenticated. | |
819 | * Otherwise it provides a padding oracle. | |
820 | */ | |
821 | n = ctx->final[b - 1]; | |
822 | if (n == 0 || n > (int)b) { | |
823 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
26a7d938 | 824 | return 0; |
0f113f3e MC |
825 | } |
826 | for (i = 0; i < n; i++) { | |
827 | if (ctx->final[--b] != n) { | |
828 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
26a7d938 | 829 | return 0; |
0f113f3e MC |
830 | } |
831 | } | |
832 | n = ctx->cipher->block_size - n; | |
833 | for (i = 0; i < n; i++) | |
834 | out[i] = ctx->final[i]; | |
835 | *outl = n; | |
836 | } else | |
837 | *outl = 0; | |
208fb891 | 838 | return 1; |
0f113f3e | 839 | } |
d02b48c6 | 840 | |
6343829a | 841 | int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) |
0f113f3e MC |
842 | { |
843 | if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) | |
844 | return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); | |
df05f2ce | 845 | if (EVP_CIPHER_CTX_key_length(c) == keylen) |
0f113f3e MC |
846 | return 1; |
847 | if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) { | |
848 | c->key_len = keylen; | |
849 | return 1; | |
850 | } | |
851 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH); | |
852 | return 0; | |
853 | } | |
49528751 | 854 | |
f2e5ca84 | 855 | int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) |
0f113f3e MC |
856 | { |
857 | if (pad) | |
858 | ctx->flags &= ~EVP_CIPH_NO_PADDING; | |
859 | else | |
860 | ctx->flags |= EVP_CIPH_NO_PADDING; | |
df05f2ce MC |
861 | |
862 | if (ctx->cipher != NULL && ctx->cipher->prov != NULL) { | |
863 | OSSL_PARAM params[] = { | |
864 | OSSL_PARAM_int(OSSL_CIPHER_PARAM_PADDING, NULL), | |
865 | OSSL_PARAM_END | |
866 | }; | |
867 | ||
868 | params[0].data = &pad; | |
869 | ||
718b133a | 870 | if (ctx->cipher->ctx_set_params == NULL) { |
df05f2ce MC |
871 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_PADDING, EVP_R_CTRL_NOT_IMPLEMENTED); |
872 | return 0; | |
873 | } | |
874 | ||
718b133a | 875 | if (!ctx->cipher->ctx_set_params(ctx->provctx, params)) |
df05f2ce MC |
876 | return 0; |
877 | } | |
878 | ||
0f113f3e MC |
879 | return 1; |
880 | } | |
f2e5ca84 | 881 | |
49528751 DSH |
882 | int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) |
883 | { | |
0f113f3e | 884 | int ret; |
d91f4568 | 885 | |
0f113f3e MC |
886 | if (!ctx->cipher) { |
887 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); | |
888 | return 0; | |
889 | } | |
890 | ||
891 | if (!ctx->cipher->ctrl) { | |
892 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); | |
893 | return 0; | |
894 | } | |
895 | ||
896 | ret = ctx->cipher->ctrl(ctx, type, arg, ptr); | |
897 | if (ret == -1) { | |
898 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, | |
899 | EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); | |
900 | return 0; | |
901 | } | |
902 | return ret; | |
49528751 | 903 | } |
216659eb DSH |
904 | |
905 | int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) | |
0f113f3e MC |
906 | { |
907 | if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) | |
908 | return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); | |
4cffafe9 | 909 | if (RAND_priv_bytes(key, ctx->key_len) <= 0) |
0f113f3e MC |
910 | return 0; |
911 | return 1; | |
912 | } | |
216659eb | 913 | |
c2bf7208 | 914 | int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) |
0f113f3e MC |
915 | { |
916 | if ((in == NULL) || (in->cipher == NULL)) { | |
917 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED); | |
918 | return 0; | |
919 | } | |
df05f2ce MC |
920 | |
921 | if (in->cipher->prov == NULL) | |
922 | goto legacy; | |
923 | ||
924 | if (in->cipher->dupctx == NULL) { | |
925 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX); | |
926 | return 0; | |
927 | } | |
928 | ||
929 | EVP_CIPHER_CTX_reset(out); | |
930 | ||
931 | *out = *in; | |
932 | out->provctx = NULL; | |
933 | ||
718b133a | 934 | if (in->fetched_cipher != NULL && !EVP_CIPHER_upref(in->fetched_cipher)) { |
df05f2ce MC |
935 | out->fetched_cipher = NULL; |
936 | return 0; | |
937 | } | |
938 | ||
939 | out->provctx = in->cipher->dupctx(in->provctx); | |
940 | if (out->provctx == NULL) { | |
941 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX); | |
942 | return 0; | |
943 | } | |
944 | ||
945 | return 1; | |
946 | ||
947 | /* TODO(3.0): Remove legacy code below */ | |
948 | legacy: | |
949 | ||
c2bf7208 | 950 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
951 | /* Make sure it's safe to copy a cipher context using an ENGINE */ |
952 | if (in->engine && !ENGINE_init(in->engine)) { | |
953 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB); | |
954 | return 0; | |
955 | } | |
c2bf7208 DSH |
956 | #endif |
957 | ||
c0ca39bd | 958 | EVP_CIPHER_CTX_reset(out); |
b4faea50 | 959 | memcpy(out, in, sizeof(*out)); |
0f113f3e MC |
960 | |
961 | if (in->cipher_data && in->cipher->ctx_size) { | |
962 | out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size); | |
90945fa3 | 963 | if (out->cipher_data == NULL) { |
273a0218 | 964 | out->cipher = NULL; |
0f113f3e MC |
965 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE); |
966 | return 0; | |
967 | } | |
968 | memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size); | |
969 | } | |
970 | ||
971 | if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) | |
273a0218 BE |
972 | if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) { |
973 | out->cipher = NULL; | |
974 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR); | |
975 | return 0; | |
976 | } | |
0f113f3e MC |
977 | return 1; |
978 | } | |
df05f2ce MC |
979 | |
980 | static void *evp_cipher_from_dispatch(int nid, const OSSL_DISPATCH *fns, | |
981 | OSSL_PROVIDER *prov) | |
982 | { | |
983 | EVP_CIPHER *cipher = NULL; | |
984 | int fnciphcnt = 0, fnctxcnt = 0; | |
985 | ||
986 | if ((cipher = EVP_CIPHER_meth_new(nid, 0, 0)) == NULL) | |
987 | return NULL; | |
988 | ||
989 | for (; fns->function_id != 0; fns++) { | |
990 | switch (fns->function_id) { | |
991 | case OSSL_FUNC_CIPHER_NEWCTX: | |
992 | if (cipher->newctx != NULL) | |
993 | break; | |
994 | cipher->newctx = OSSL_get_OP_cipher_newctx(fns); | |
995 | fnctxcnt++; | |
996 | break; | |
997 | case OSSL_FUNC_CIPHER_ENCRYPT_INIT: | |
998 | if (cipher->einit != NULL) | |
999 | break; | |
1000 | cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns); | |
1001 | fnciphcnt++; | |
1002 | break; | |
1003 | case OSSL_FUNC_CIPHER_DECRYPT_INIT: | |
1004 | if (cipher->dinit != NULL) | |
1005 | break; | |
1006 | cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns); | |
1007 | fnciphcnt++; | |
1008 | break; | |
1009 | case OSSL_FUNC_CIPHER_UPDATE: | |
1010 | if (cipher->cupdate != NULL) | |
1011 | break; | |
1012 | cipher->cupdate = OSSL_get_OP_cipher_update(fns); | |
1013 | fnciphcnt++; | |
1014 | break; | |
1015 | case OSSL_FUNC_CIPHER_FINAL: | |
1016 | if (cipher->cfinal != NULL) | |
1017 | break; | |
1018 | cipher->cfinal = OSSL_get_OP_cipher_final(fns); | |
1019 | fnciphcnt++; | |
1020 | break; | |
718b133a MC |
1021 | case OSSL_FUNC_CIPHER_CIPHER: |
1022 | if (cipher->ccipher != NULL) | |
1023 | break; | |
1024 | cipher->ccipher = OSSL_get_OP_cipher_cipher(fns); | |
1025 | break; | |
df05f2ce MC |
1026 | case OSSL_FUNC_CIPHER_FREECTX: |
1027 | if (cipher->freectx != NULL) | |
1028 | break; | |
1029 | cipher->freectx = OSSL_get_OP_cipher_freectx(fns); | |
1030 | fnctxcnt++; | |
1031 | break; | |
1032 | case OSSL_FUNC_CIPHER_DUPCTX: | |
1033 | if (cipher->dupctx != NULL) | |
1034 | break; | |
1035 | cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns); | |
1036 | break; | |
1037 | case OSSL_FUNC_CIPHER_KEY_LENGTH: | |
1038 | if (cipher->key_length != NULL) | |
1039 | break; | |
1040 | cipher->key_length = OSSL_get_OP_cipher_key_length(fns); | |
1041 | break; | |
718b133a MC |
1042 | case OSSL_FUNC_CIPHER_IV_LENGTH: |
1043 | if (cipher->iv_length != NULL) | |
1044 | break; | |
1045 | cipher->iv_length = OSSL_get_OP_cipher_iv_length(fns); | |
1046 | break; | |
1047 | case OSSL_FUNC_CIPHER_BLOCK_SIZE: | |
1048 | if (cipher->blocksize != NULL) | |
1049 | break; | |
1050 | cipher->blocksize = OSSL_get_OP_cipher_block_size(fns); | |
1051 | break; | |
df05f2ce MC |
1052 | case OSSL_FUNC_CIPHER_GET_PARAMS: |
1053 | if (cipher->get_params != NULL) | |
1054 | break; | |
1055 | cipher->get_params = OSSL_get_OP_cipher_get_params(fns); | |
1056 | break; | |
718b133a MC |
1057 | case OSSL_FUNC_CIPHER_CTX_GET_PARAMS: |
1058 | if (cipher->ctx_get_params != NULL) | |
1059 | break; | |
1060 | cipher->ctx_get_params = OSSL_get_OP_cipher_ctx_get_params(fns); | |
1061 | break; | |
1062 | case OSSL_FUNC_CIPHER_CTX_SET_PARAMS: | |
1063 | if (cipher->ctx_set_params != NULL) | |
df05f2ce | 1064 | break; |
718b133a | 1065 | cipher->ctx_set_params = OSSL_get_OP_cipher_ctx_set_params(fns); |
df05f2ce MC |
1066 | break; |
1067 | } | |
1068 | } | |
718b133a MC |
1069 | if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4) |
1070 | || (fnciphcnt == 0 && cipher->ccipher == NULL) | |
df05f2ce MC |
1071 | || fnctxcnt != 2) { |
1072 | /* | |
1073 | * In order to be a consistent set of functions we must have at least | |
1074 | * a complete set of "encrypt" functions, or a complete set of "decrypt" | |
718b133a MC |
1075 | * functions, or a single "cipher" function. In all cases we need a |
1076 | * complete set of context management functions | |
df05f2ce MC |
1077 | */ |
1078 | EVP_CIPHER_meth_free(cipher); | |
1079 | EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS); | |
1080 | return NULL; | |
1081 | } | |
1082 | cipher->prov = prov; | |
1083 | if (prov != NULL) | |
1084 | ossl_provider_upref(prov); | |
1085 | ||
1086 | return cipher; | |
1087 | } | |
1088 | ||
1089 | static int evp_cipher_upref(void *cipher) | |
1090 | { | |
1091 | return EVP_CIPHER_upref(cipher); | |
1092 | } | |
1093 | ||
1094 | static void evp_cipher_free(void *cipher) | |
1095 | { | |
1096 | EVP_CIPHER_meth_free(cipher); | |
1097 | } | |
1098 | ||
1099 | static int evp_cipher_nid(void *vcipher) | |
1100 | { | |
1101 | EVP_CIPHER *cipher = vcipher; | |
1102 | ||
1103 | return cipher->nid; | |
1104 | } | |
1105 | ||
1106 | EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm, | |
1107 | const char *properties) | |
1108 | { | |
1109 | return evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties, | |
1110 | evp_cipher_from_dispatch, evp_cipher_upref, | |
1111 | evp_cipher_free, evp_cipher_nid); | |
1112 | } |