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58964a49 | 1 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
2 | * All rights reserved. |
3 | * | |
4 | * This package is an SSL implementation written | |
5 | * by Eric Young (eay@cryptsoft.com). | |
6 | * The implementation was written so as to conform with Netscapes SSL. | |
0f113f3e | 7 | * |
d02b48c6 RE |
8 | * This library is free for commercial and non-commercial use as long as |
9 | * the following conditions are aheared to. The following conditions | |
10 | * apply to all code found in this distribution, be it the RC4, RSA, | |
11 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
12 | * included with this distribution is covered by the same copyright terms | |
13 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
0f113f3e | 14 | * |
d02b48c6 RE |
15 | * Copyright remains Eric Young's, and as such any Copyright notices in |
16 | * the code are not to be removed. | |
17 | * If this package is used in a product, Eric Young should be given attribution | |
18 | * as the author of the parts of the library used. | |
19 | * This can be in the form of a textual message at program startup or | |
20 | * in documentation (online or textual) provided with the package. | |
0f113f3e | 21 | * |
d02b48c6 RE |
22 | * Redistribution and use in source and binary forms, with or without |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * 3. All advertising materials mentioning features or use of this software | |
31 | * must display the following acknowledgement: | |
32 | * "This product includes cryptographic software written by | |
33 | * Eric Young (eay@cryptsoft.com)" | |
34 | * The word 'cryptographic' can be left out if the rouines from the library | |
35 | * being used are not cryptographic related :-). | |
0f113f3e | 36 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
37 | * the apps directory (application code) you must include an acknowledgement: |
38 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 39 | * |
d02b48c6 RE |
40 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
50 | * SUCH DAMAGE. | |
0f113f3e | 51 | * |
d02b48c6 RE |
52 | * The licence and distribution terms for any publically available version or |
53 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
54 | * copied and put under another distribution licence | |
55 | * [including the GNU Public Licence.] | |
56 | */ | |
57 | ||
58 | #include <stdio.h> | |
b39fc560 | 59 | #include "internal/cryptlib.h" |
ec577822 | 60 | #include <openssl/evp.h> |
7f060601 | 61 | #include <openssl/err.h> |
3a87a9b9 | 62 | #include <openssl/rand.h> |
0b13e9f0 | 63 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e | 64 | # include <openssl/engine.h> |
0b13e9f0 | 65 | #endif |
135727ab | 66 | #include "internal/evp_int.h" |
57ae2e24 | 67 | #include "evp_locl.h" |
d02b48c6 | 68 | |
8baf9968 | 69 | int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *c) |
0f113f3e | 70 | { |
8baf9968 RL |
71 | if (c == NULL) |
72 | return 1; | |
73 | if (c->cipher != NULL) { | |
74 | if (c->cipher->cleanup && !c->cipher->cleanup(c)) | |
75 | return 0; | |
76 | /* Cleanse cipher context data */ | |
77 | if (c->cipher_data && c->cipher->ctx_size) | |
78 | OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); | |
79 | } | |
80 | OPENSSL_free(c->cipher_data); | |
81 | #ifndef OPENSSL_NO_ENGINE | |
82 | if (c->engine) | |
83 | /* | |
84 | * The EVP_CIPHER we used belongs to an ENGINE, release the | |
85 | * functional reference we held for this reason. | |
86 | */ | |
87 | ENGINE_finish(c->engine); | |
88 | #endif | |
89 | memset(c, 0, sizeof(*c)); | |
90 | return 1; | |
0f113f3e | 91 | } |
d02b48c6 | 92 | |
b40228a6 | 93 | EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) |
0f113f3e | 94 | { |
8baf9968 RL |
95 | return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX)); |
96 | } | |
97 | ||
98 | void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) | |
99 | { | |
100 | EVP_CIPHER_CTX_reset(ctx); | |
101 | OPENSSL_free(ctx); | |
0f113f3e | 102 | } |
581f1c84 | 103 | |
360370d9 | 104 | int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
105 | const unsigned char *key, const unsigned char *iv, int enc) |
106 | { | |
c0ca39bd | 107 | EVP_CIPHER_CTX_reset(ctx); |
0f113f3e MC |
108 | return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc); |
109 | } | |
110 | ||
111 | int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, | |
112 | ENGINE *impl, const unsigned char *key, | |
113 | const unsigned char *iv, int enc) | |
114 | { | |
115 | if (enc == -1) | |
116 | enc = ctx->encrypt; | |
117 | else { | |
118 | if (enc) | |
119 | enc = 1; | |
120 | ctx->encrypt = enc; | |
121 | } | |
0b13e9f0 | 122 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
123 | /* |
124 | * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so | |
125 | * this context may already have an ENGINE! Try to avoid releasing the | |
126 | * previous handle, re-querying for an ENGINE, and having a | |
0d4fb843 | 127 | * reinitialisation, when it may all be unnecessary. |
0f113f3e | 128 | */ |
f6b94279 AP |
129 | if (ctx->engine && ctx->cipher |
130 | && (!cipher || (cipher && (cipher->nid == ctx->cipher->nid)))) | |
0f113f3e | 131 | goto skip_to_init; |
0b13e9f0 | 132 | #endif |
0f113f3e MC |
133 | if (cipher) { |
134 | /* | |
135 | * Ensure a context left lying around from last time is cleared (the | |
136 | * previous check attempted to avoid this if the same ENGINE and | |
137 | * EVP_CIPHER could be used). | |
138 | */ | |
139 | if (ctx->cipher) { | |
140 | unsigned long flags = ctx->flags; | |
c0ca39bd | 141 | EVP_CIPHER_CTX_reset(ctx); |
0f113f3e MC |
142 | /* Restore encrypt and flags */ |
143 | ctx->encrypt = enc; | |
144 | ctx->flags = flags; | |
145 | } | |
0b13e9f0 | 146 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
147 | if (impl) { |
148 | if (!ENGINE_init(impl)) { | |
149 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
150 | return 0; | |
151 | } | |
152 | } else | |
153 | /* Ask if an ENGINE is reserved for this job */ | |
154 | impl = ENGINE_get_cipher_engine(cipher->nid); | |
155 | if (impl) { | |
156 | /* There's an ENGINE for this job ... (apparently) */ | |
157 | const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid); | |
158 | if (!c) { | |
159 | /* | |
160 | * One positive side-effect of US's export control history, | |
161 | * is that we should at least be able to avoid using US | |
0d4fb843 | 162 | * misspellings of "initialisation"? |
0f113f3e MC |
163 | */ |
164 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
165 | return 0; | |
166 | } | |
167 | /* We'll use the ENGINE's private cipher definition */ | |
168 | cipher = c; | |
169 | /* | |
170 | * Store the ENGINE functional reference so we know 'cipher' came | |
171 | * from an ENGINE and we need to release it when done. | |
172 | */ | |
173 | ctx->engine = impl; | |
174 | } else | |
175 | ctx->engine = NULL; | |
0b13e9f0 | 176 | #endif |
544a2aea | 177 | |
0f113f3e MC |
178 | ctx->cipher = cipher; |
179 | if (ctx->cipher->ctx_size) { | |
b51bce94 | 180 | ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size); |
90945fa3 | 181 | if (ctx->cipher_data == NULL) { |
0f113f3e MC |
182 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); |
183 | return 0; | |
184 | } | |
185 | } else { | |
186 | ctx->cipher_data = NULL; | |
187 | } | |
188 | ctx->key_len = cipher->key_len; | |
189 | /* Preserve wrap enable flag, zero everything else */ | |
190 | ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW; | |
191 | if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { | |
192 | if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { | |
193 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
194 | return 0; | |
195 | } | |
196 | } | |
197 | } else if (!ctx->cipher) { | |
198 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); | |
199 | return 0; | |
200 | } | |
0b13e9f0 | 201 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e | 202 | skip_to_init: |
0b13e9f0 | 203 | #endif |
0f113f3e MC |
204 | /* we assume block size is a power of 2 in *cryptUpdate */ |
205 | OPENSSL_assert(ctx->cipher->block_size == 1 | |
206 | || ctx->cipher->block_size == 8 | |
207 | || ctx->cipher->block_size == 16); | |
208 | ||
209 | if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW) | |
210 | && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) { | |
211 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED); | |
212 | return 0; | |
213 | } | |
214 | ||
480d3323 | 215 | if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) { |
0f113f3e MC |
216 | switch (EVP_CIPHER_CTX_mode(ctx)) { |
217 | ||
218 | case EVP_CIPH_STREAM_CIPHER: | |
219 | case EVP_CIPH_ECB_MODE: | |
220 | break; | |
221 | ||
222 | case EVP_CIPH_CFB_MODE: | |
223 | case EVP_CIPH_OFB_MODE: | |
224 | ||
225 | ctx->num = 0; | |
226 | /* fall-through */ | |
227 | ||
228 | case EVP_CIPH_CBC_MODE: | |
229 | ||
230 | OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= | |
231 | (int)sizeof(ctx->iv)); | |
232 | if (iv) | |
233 | memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
234 | memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); | |
235 | break; | |
236 | ||
237 | case EVP_CIPH_CTR_MODE: | |
238 | ctx->num = 0; | |
239 | /* Don't reuse IV for CTR mode */ | |
240 | if (iv) | |
241 | memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
242 | break; | |
243 | ||
244 | default: | |
245 | return 0; | |
0f113f3e MC |
246 | } |
247 | } | |
248 | ||
249 | if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { | |
250 | if (!ctx->cipher->init(ctx, key, iv, enc)) | |
251 | return 0; | |
252 | } | |
253 | ctx->buf_len = 0; | |
254 | ctx->final_used = 0; | |
255 | ctx->block_mask = ctx->cipher->block_size - 1; | |
256 | return 1; | |
257 | } | |
d02b48c6 | 258 | |
be06a934 | 259 | int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
260 | const unsigned char *in, int inl) |
261 | { | |
262 | if (ctx->encrypt) | |
263 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
264 | else | |
265 | return EVP_DecryptUpdate(ctx, out, outl, in, inl); | |
266 | } | |
d02b48c6 | 267 | |
581f1c84 | 268 | int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
269 | { |
270 | if (ctx->encrypt) | |
271 | return EVP_EncryptFinal_ex(ctx, out, outl); | |
272 | else | |
273 | return EVP_DecryptFinal_ex(ctx, out, outl); | |
274 | } | |
581f1c84 | 275 | |
6b691a5c | 276 | int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
277 | { |
278 | if (ctx->encrypt) | |
279 | return EVP_EncryptFinal(ctx, out, outl); | |
280 | else | |
281 | return EVP_DecryptFinal(ctx, out, outl); | |
282 | } | |
d02b48c6 | 283 | |
be06a934 | 284 | int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
285 | const unsigned char *key, const unsigned char *iv) |
286 | { | |
287 | return EVP_CipherInit(ctx, cipher, key, iv, 1); | |
288 | } | |
18eda732 | 289 | |
0f113f3e MC |
290 | int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
291 | ENGINE *impl, const unsigned char *key, | |
292 | const unsigned char *iv) | |
293 | { | |
294 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); | |
295 | } | |
d02b48c6 | 296 | |
be06a934 | 297 | int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
298 | const unsigned char *key, const unsigned char *iv) |
299 | { | |
300 | return EVP_CipherInit(ctx, cipher, key, iv, 0); | |
301 | } | |
18eda732 | 302 | |
0f113f3e MC |
303 | int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
304 | ENGINE *impl, const unsigned char *key, | |
305 | const unsigned char *iv) | |
306 | { | |
307 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); | |
308 | } | |
d02b48c6 | 309 | |
be06a934 | 310 | int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
311 | const unsigned char *in, int inl) |
312 | { | |
313 | int i, j, bl; | |
314 | ||
315 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
316 | i = ctx->cipher->do_cipher(ctx, out, in, inl); | |
317 | if (i < 0) | |
318 | return 0; | |
319 | else | |
320 | *outl = i; | |
321 | return 1; | |
322 | } | |
323 | ||
324 | if (inl <= 0) { | |
325 | *outl = 0; | |
326 | return inl == 0; | |
327 | } | |
328 | ||
329 | if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) { | |
330 | if (ctx->cipher->do_cipher(ctx, out, in, inl)) { | |
331 | *outl = inl; | |
332 | return 1; | |
333 | } else { | |
334 | *outl = 0; | |
335 | return 0; | |
336 | } | |
337 | } | |
338 | i = ctx->buf_len; | |
339 | bl = ctx->cipher->block_size; | |
340 | OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); | |
341 | if (i != 0) { | |
342 | if (i + inl < bl) { | |
343 | memcpy(&(ctx->buf[i]), in, inl); | |
344 | ctx->buf_len += inl; | |
345 | *outl = 0; | |
346 | return 1; | |
347 | } else { | |
348 | j = bl - i; | |
349 | memcpy(&(ctx->buf[i]), in, j); | |
350 | if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl)) | |
351 | return 0; | |
352 | inl -= j; | |
353 | in += j; | |
354 | out += bl; | |
355 | *outl = bl; | |
356 | } | |
357 | } else | |
358 | *outl = 0; | |
359 | i = inl & (bl - 1); | |
360 | inl -= i; | |
361 | if (inl > 0) { | |
362 | if (!ctx->cipher->do_cipher(ctx, out, in, inl)) | |
363 | return 0; | |
364 | *outl += inl; | |
365 | } | |
366 | ||
367 | if (i != 0) | |
368 | memcpy(ctx->buf, &(in[inl]), i); | |
369 | ctx->buf_len = i; | |
370 | return 1; | |
371 | } | |
d02b48c6 | 372 | |
be06a934 | 373 | int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
374 | { |
375 | int ret; | |
376 | ret = EVP_EncryptFinal_ex(ctx, out, outl); | |
377 | return ret; | |
378 | } | |
581f1c84 DSH |
379 | |
380 | int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
0f113f3e MC |
381 | { |
382 | int n, ret; | |
383 | unsigned int i, b, bl; | |
384 | ||
385 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
386 | ret = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
387 | if (ret < 0) | |
388 | return 0; | |
389 | else | |
390 | *outl = ret; | |
391 | return 1; | |
392 | } | |
393 | ||
394 | b = ctx->cipher->block_size; | |
395 | OPENSSL_assert(b <= sizeof ctx->buf); | |
396 | if (b == 1) { | |
397 | *outl = 0; | |
398 | return 1; | |
399 | } | |
400 | bl = ctx->buf_len; | |
401 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
402 | if (bl) { | |
403 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, | |
404 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
405 | return 0; | |
406 | } | |
407 | *outl = 0; | |
408 | return 1; | |
409 | } | |
410 | ||
411 | n = b - bl; | |
412 | for (i = bl; i < b; i++) | |
413 | ctx->buf[i] = n; | |
414 | ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b); | |
415 | ||
416 | if (ret) | |
417 | *outl = b; | |
418 | ||
419 | return ret; | |
420 | } | |
d02b48c6 | 421 | |
be06a934 | 422 | int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
423 | const unsigned char *in, int inl) |
424 | { | |
425 | int fix_len; | |
426 | unsigned int b; | |
427 | ||
428 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
429 | fix_len = ctx->cipher->do_cipher(ctx, out, in, inl); | |
430 | if (fix_len < 0) { | |
431 | *outl = 0; | |
432 | return 0; | |
433 | } else | |
434 | *outl = fix_len; | |
435 | return 1; | |
436 | } | |
437 | ||
438 | if (inl <= 0) { | |
439 | *outl = 0; | |
440 | return inl == 0; | |
441 | } | |
442 | ||
443 | if (ctx->flags & EVP_CIPH_NO_PADDING) | |
444 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
445 | ||
446 | b = ctx->cipher->block_size; | |
447 | OPENSSL_assert(b <= sizeof ctx->final); | |
448 | ||
449 | if (ctx->final_used) { | |
450 | memcpy(out, ctx->final, b); | |
451 | out += b; | |
452 | fix_len = 1; | |
453 | } else | |
454 | fix_len = 0; | |
455 | ||
456 | if (!EVP_EncryptUpdate(ctx, out, outl, in, inl)) | |
457 | return 0; | |
458 | ||
459 | /* | |
460 | * if we have 'decrypted' a multiple of block size, make sure we have a | |
461 | * copy of this last block | |
462 | */ | |
463 | if (b > 1 && !ctx->buf_len) { | |
464 | *outl -= b; | |
465 | ctx->final_used = 1; | |
466 | memcpy(ctx->final, &out[*outl], b); | |
467 | } else | |
468 | ctx->final_used = 0; | |
469 | ||
470 | if (fix_len) | |
471 | *outl += b; | |
472 | ||
473 | return 1; | |
474 | } | |
d02b48c6 | 475 | |
6b691a5c | 476 | int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
477 | { |
478 | int ret; | |
479 | ret = EVP_DecryptFinal_ex(ctx, out, outl); | |
480 | return ret; | |
481 | } | |
581f1c84 DSH |
482 | |
483 | int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
0f113f3e MC |
484 | { |
485 | int i, n; | |
486 | unsigned int b; | |
487 | *outl = 0; | |
488 | ||
489 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
490 | i = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
491 | if (i < 0) | |
492 | return 0; | |
493 | else | |
494 | *outl = i; | |
495 | return 1; | |
496 | } | |
497 | ||
498 | b = ctx->cipher->block_size; | |
499 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
500 | if (ctx->buf_len) { | |
501 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, | |
502 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
503 | return 0; | |
504 | } | |
505 | *outl = 0; | |
506 | return 1; | |
507 | } | |
508 | if (b > 1) { | |
509 | if (ctx->buf_len || !ctx->final_used) { | |
510 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH); | |
511 | return (0); | |
512 | } | |
513 | OPENSSL_assert(b <= sizeof ctx->final); | |
514 | ||
515 | /* | |
516 | * The following assumes that the ciphertext has been authenticated. | |
517 | * Otherwise it provides a padding oracle. | |
518 | */ | |
519 | n = ctx->final[b - 1]; | |
520 | if (n == 0 || n > (int)b) { | |
521 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
522 | return (0); | |
523 | } | |
524 | for (i = 0; i < n; i++) { | |
525 | if (ctx->final[--b] != n) { | |
526 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
527 | return (0); | |
528 | } | |
529 | } | |
530 | n = ctx->cipher->block_size - n; | |
531 | for (i = 0; i < n; i++) | |
532 | out[i] = ctx->final[i]; | |
533 | *outl = n; | |
534 | } else | |
535 | *outl = 0; | |
536 | return (1); | |
537 | } | |
d02b48c6 | 538 | |
6343829a | 539 | int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) |
0f113f3e MC |
540 | { |
541 | if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) | |
542 | return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); | |
543 | if (c->key_len == keylen) | |
544 | return 1; | |
545 | if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) { | |
546 | c->key_len = keylen; | |
547 | return 1; | |
548 | } | |
549 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH); | |
550 | return 0; | |
551 | } | |
49528751 | 552 | |
f2e5ca84 | 553 | int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) |
0f113f3e MC |
554 | { |
555 | if (pad) | |
556 | ctx->flags &= ~EVP_CIPH_NO_PADDING; | |
557 | else | |
558 | ctx->flags |= EVP_CIPH_NO_PADDING; | |
559 | return 1; | |
560 | } | |
f2e5ca84 | 561 | |
49528751 DSH |
562 | int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) |
563 | { | |
0f113f3e MC |
564 | int ret; |
565 | if (!ctx->cipher) { | |
566 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); | |
567 | return 0; | |
568 | } | |
569 | ||
570 | if (!ctx->cipher->ctrl) { | |
571 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); | |
572 | return 0; | |
573 | } | |
574 | ||
575 | ret = ctx->cipher->ctrl(ctx, type, arg, ptr); | |
576 | if (ret == -1) { | |
577 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, | |
578 | EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); | |
579 | return 0; | |
580 | } | |
581 | return ret; | |
49528751 | 582 | } |
216659eb DSH |
583 | |
584 | int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) | |
0f113f3e MC |
585 | { |
586 | if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) | |
587 | return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); | |
588 | if (RAND_bytes(key, ctx->key_len) <= 0) | |
589 | return 0; | |
590 | return 1; | |
591 | } | |
216659eb | 592 | |
c2bf7208 | 593 | int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) |
0f113f3e MC |
594 | { |
595 | if ((in == NULL) || (in->cipher == NULL)) { | |
596 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED); | |
597 | return 0; | |
598 | } | |
c2bf7208 | 599 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
600 | /* Make sure it's safe to copy a cipher context using an ENGINE */ |
601 | if (in->engine && !ENGINE_init(in->engine)) { | |
602 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB); | |
603 | return 0; | |
604 | } | |
c2bf7208 DSH |
605 | #endif |
606 | ||
c0ca39bd | 607 | EVP_CIPHER_CTX_reset(out); |
b4faea50 | 608 | memcpy(out, in, sizeof(*out)); |
0f113f3e MC |
609 | |
610 | if (in->cipher_data && in->cipher->ctx_size) { | |
611 | out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size); | |
90945fa3 | 612 | if (out->cipher_data == NULL) { |
0f113f3e MC |
613 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE); |
614 | return 0; | |
615 | } | |
616 | memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size); | |
617 | } | |
618 | ||
619 | if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) | |
620 | return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out); | |
621 | return 1; | |
622 | } |