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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 | |
7c96dbcd | 82 | ENGINE_finish(c->engine); |
8baf9968 RL |
83 | #endif |
84 | memset(c, 0, sizeof(*c)); | |
85 | return 1; | |
0f113f3e | 86 | } |
d02b48c6 | 87 | |
b40228a6 | 88 | EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) |
0f113f3e | 89 | { |
8baf9968 RL |
90 | return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX)); |
91 | } | |
92 | ||
93 | void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) | |
94 | { | |
95 | EVP_CIPHER_CTX_reset(ctx); | |
96 | OPENSSL_free(ctx); | |
0f113f3e | 97 | } |
581f1c84 | 98 | |
360370d9 | 99 | int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
100 | const unsigned char *key, const unsigned char *iv, int enc) |
101 | { | |
c0ca39bd | 102 | EVP_CIPHER_CTX_reset(ctx); |
0f113f3e MC |
103 | return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc); |
104 | } | |
105 | ||
106 | int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, | |
107 | ENGINE *impl, const unsigned char *key, | |
108 | const unsigned char *iv, int enc) | |
109 | { | |
110 | if (enc == -1) | |
111 | enc = ctx->encrypt; | |
112 | else { | |
113 | if (enc) | |
114 | enc = 1; | |
115 | ctx->encrypt = enc; | |
116 | } | |
0b13e9f0 | 117 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
118 | /* |
119 | * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so | |
120 | * this context may already have an ENGINE! Try to avoid releasing the | |
121 | * previous handle, re-querying for an ENGINE, and having a | |
0d4fb843 | 122 | * reinitialisation, when it may all be unnecessary. |
0f113f3e | 123 | */ |
f6b94279 AP |
124 | if (ctx->engine && ctx->cipher |
125 | && (!cipher || (cipher && (cipher->nid == ctx->cipher->nid)))) | |
0f113f3e | 126 | goto skip_to_init; |
0b13e9f0 | 127 | #endif |
0f113f3e MC |
128 | if (cipher) { |
129 | /* | |
130 | * Ensure a context left lying around from last time is cleared (the | |
131 | * previous check attempted to avoid this if the same ENGINE and | |
132 | * EVP_CIPHER could be used). | |
133 | */ | |
134 | if (ctx->cipher) { | |
135 | unsigned long flags = ctx->flags; | |
c0ca39bd | 136 | EVP_CIPHER_CTX_reset(ctx); |
0f113f3e MC |
137 | /* Restore encrypt and flags */ |
138 | ctx->encrypt = enc; | |
139 | ctx->flags = flags; | |
140 | } | |
0b13e9f0 | 141 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
142 | if (impl) { |
143 | if (!ENGINE_init(impl)) { | |
144 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
145 | return 0; | |
146 | } | |
147 | } else | |
148 | /* Ask if an ENGINE is reserved for this job */ | |
149 | impl = ENGINE_get_cipher_engine(cipher->nid); | |
150 | if (impl) { | |
151 | /* There's an ENGINE for this job ... (apparently) */ | |
152 | const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid); | |
153 | if (!c) { | |
154 | /* | |
155 | * One positive side-effect of US's export control history, | |
156 | * is that we should at least be able to avoid using US | |
0d4fb843 | 157 | * misspellings of "initialisation"? |
0f113f3e MC |
158 | */ |
159 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
160 | return 0; | |
161 | } | |
162 | /* We'll use the ENGINE's private cipher definition */ | |
163 | cipher = c; | |
164 | /* | |
165 | * Store the ENGINE functional reference so we know 'cipher' came | |
166 | * from an ENGINE and we need to release it when done. | |
167 | */ | |
168 | ctx->engine = impl; | |
169 | } else | |
170 | ctx->engine = NULL; | |
0b13e9f0 | 171 | #endif |
544a2aea | 172 | |
0f113f3e MC |
173 | ctx->cipher = cipher; |
174 | if (ctx->cipher->ctx_size) { | |
b51bce94 | 175 | ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size); |
90945fa3 | 176 | if (ctx->cipher_data == NULL) { |
0f113f3e MC |
177 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); |
178 | return 0; | |
179 | } | |
180 | } else { | |
181 | ctx->cipher_data = NULL; | |
182 | } | |
183 | ctx->key_len = cipher->key_len; | |
184 | /* Preserve wrap enable flag, zero everything else */ | |
185 | ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW; | |
186 | if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { | |
187 | if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { | |
188 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
189 | return 0; | |
190 | } | |
191 | } | |
192 | } else if (!ctx->cipher) { | |
193 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); | |
194 | return 0; | |
195 | } | |
0b13e9f0 | 196 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e | 197 | skip_to_init: |
0b13e9f0 | 198 | #endif |
0f113f3e MC |
199 | /* we assume block size is a power of 2 in *cryptUpdate */ |
200 | OPENSSL_assert(ctx->cipher->block_size == 1 | |
201 | || ctx->cipher->block_size == 8 | |
202 | || ctx->cipher->block_size == 16); | |
203 | ||
204 | if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW) | |
205 | && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) { | |
206 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED); | |
207 | return 0; | |
208 | } | |
209 | ||
480d3323 | 210 | if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) { |
0f113f3e MC |
211 | switch (EVP_CIPHER_CTX_mode(ctx)) { |
212 | ||
213 | case EVP_CIPH_STREAM_CIPHER: | |
214 | case EVP_CIPH_ECB_MODE: | |
215 | break; | |
216 | ||
217 | case EVP_CIPH_CFB_MODE: | |
218 | case EVP_CIPH_OFB_MODE: | |
219 | ||
220 | ctx->num = 0; | |
221 | /* fall-through */ | |
222 | ||
223 | case EVP_CIPH_CBC_MODE: | |
224 | ||
225 | OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= | |
226 | (int)sizeof(ctx->iv)); | |
227 | if (iv) | |
228 | memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
229 | memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); | |
230 | break; | |
231 | ||
232 | case EVP_CIPH_CTR_MODE: | |
233 | ctx->num = 0; | |
234 | /* Don't reuse IV for CTR mode */ | |
235 | if (iv) | |
236 | memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
237 | break; | |
238 | ||
239 | default: | |
240 | return 0; | |
0f113f3e MC |
241 | } |
242 | } | |
243 | ||
244 | if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { | |
245 | if (!ctx->cipher->init(ctx, key, iv, enc)) | |
246 | return 0; | |
247 | } | |
248 | ctx->buf_len = 0; | |
249 | ctx->final_used = 0; | |
250 | ctx->block_mask = ctx->cipher->block_size - 1; | |
251 | return 1; | |
252 | } | |
d02b48c6 | 253 | |
be06a934 | 254 | int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
255 | const unsigned char *in, int inl) |
256 | { | |
257 | if (ctx->encrypt) | |
258 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
259 | else | |
260 | return EVP_DecryptUpdate(ctx, out, outl, in, inl); | |
261 | } | |
d02b48c6 | 262 | |
581f1c84 | 263 | int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
264 | { |
265 | if (ctx->encrypt) | |
266 | return EVP_EncryptFinal_ex(ctx, out, outl); | |
267 | else | |
268 | return EVP_DecryptFinal_ex(ctx, out, outl); | |
269 | } | |
581f1c84 | 270 | |
6b691a5c | 271 | int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
272 | { |
273 | if (ctx->encrypt) | |
274 | return EVP_EncryptFinal(ctx, out, outl); | |
275 | else | |
276 | return EVP_DecryptFinal(ctx, out, outl); | |
277 | } | |
d02b48c6 | 278 | |
be06a934 | 279 | int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
280 | const unsigned char *key, const unsigned char *iv) |
281 | { | |
282 | return EVP_CipherInit(ctx, cipher, key, iv, 1); | |
283 | } | |
18eda732 | 284 | |
0f113f3e MC |
285 | int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
286 | ENGINE *impl, const unsigned char *key, | |
287 | const unsigned char *iv) | |
288 | { | |
289 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); | |
290 | } | |
d02b48c6 | 291 | |
be06a934 | 292 | int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0f113f3e MC |
293 | const unsigned char *key, const unsigned char *iv) |
294 | { | |
295 | return EVP_CipherInit(ctx, cipher, key, iv, 0); | |
296 | } | |
18eda732 | 297 | |
0f113f3e MC |
298 | int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
299 | ENGINE *impl, const unsigned char *key, | |
300 | const unsigned char *iv) | |
301 | { | |
302 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); | |
303 | } | |
d02b48c6 | 304 | |
be06a934 | 305 | int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
306 | const unsigned char *in, int inl) |
307 | { | |
308 | int i, j, bl; | |
309 | ||
310 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
311 | i = ctx->cipher->do_cipher(ctx, out, in, inl); | |
312 | if (i < 0) | |
313 | return 0; | |
314 | else | |
315 | *outl = i; | |
316 | return 1; | |
317 | } | |
318 | ||
319 | if (inl <= 0) { | |
320 | *outl = 0; | |
321 | return inl == 0; | |
322 | } | |
323 | ||
324 | if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) { | |
325 | if (ctx->cipher->do_cipher(ctx, out, in, inl)) { | |
326 | *outl = inl; | |
327 | return 1; | |
328 | } else { | |
329 | *outl = 0; | |
330 | return 0; | |
331 | } | |
332 | } | |
333 | i = ctx->buf_len; | |
334 | bl = ctx->cipher->block_size; | |
335 | OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); | |
336 | if (i != 0) { | |
337 | if (i + inl < bl) { | |
338 | memcpy(&(ctx->buf[i]), in, inl); | |
339 | ctx->buf_len += inl; | |
340 | *outl = 0; | |
341 | return 1; | |
342 | } else { | |
343 | j = bl - i; | |
344 | memcpy(&(ctx->buf[i]), in, j); | |
345 | if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl)) | |
346 | return 0; | |
347 | inl -= j; | |
348 | in += j; | |
349 | out += bl; | |
350 | *outl = bl; | |
351 | } | |
352 | } else | |
353 | *outl = 0; | |
354 | i = inl & (bl - 1); | |
355 | inl -= i; | |
356 | if (inl > 0) { | |
357 | if (!ctx->cipher->do_cipher(ctx, out, in, inl)) | |
358 | return 0; | |
359 | *outl += inl; | |
360 | } | |
361 | ||
362 | if (i != 0) | |
363 | memcpy(ctx->buf, &(in[inl]), i); | |
364 | ctx->buf_len = i; | |
365 | return 1; | |
366 | } | |
d02b48c6 | 367 | |
be06a934 | 368 | int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
369 | { |
370 | int ret; | |
371 | ret = EVP_EncryptFinal_ex(ctx, out, outl); | |
372 | return ret; | |
373 | } | |
581f1c84 DSH |
374 | |
375 | int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
0f113f3e MC |
376 | { |
377 | int n, ret; | |
378 | unsigned int i, b, bl; | |
379 | ||
380 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
381 | ret = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
382 | if (ret < 0) | |
383 | return 0; | |
384 | else | |
385 | *outl = ret; | |
386 | return 1; | |
387 | } | |
388 | ||
389 | b = ctx->cipher->block_size; | |
390 | OPENSSL_assert(b <= sizeof ctx->buf); | |
391 | if (b == 1) { | |
392 | *outl = 0; | |
393 | return 1; | |
394 | } | |
395 | bl = ctx->buf_len; | |
396 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
397 | if (bl) { | |
398 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, | |
399 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
400 | return 0; | |
401 | } | |
402 | *outl = 0; | |
403 | return 1; | |
404 | } | |
405 | ||
406 | n = b - bl; | |
407 | for (i = bl; i < b; i++) | |
408 | ctx->buf[i] = n; | |
409 | ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b); | |
410 | ||
411 | if (ret) | |
412 | *outl = b; | |
413 | ||
414 | return ret; | |
415 | } | |
d02b48c6 | 416 | |
be06a934 | 417 | int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0f113f3e MC |
418 | const unsigned char *in, int inl) |
419 | { | |
420 | int fix_len; | |
421 | unsigned int b; | |
422 | ||
423 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
424 | fix_len = ctx->cipher->do_cipher(ctx, out, in, inl); | |
425 | if (fix_len < 0) { | |
426 | *outl = 0; | |
427 | return 0; | |
428 | } else | |
429 | *outl = fix_len; | |
430 | return 1; | |
431 | } | |
432 | ||
433 | if (inl <= 0) { | |
434 | *outl = 0; | |
435 | return inl == 0; | |
436 | } | |
437 | ||
438 | if (ctx->flags & EVP_CIPH_NO_PADDING) | |
439 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
440 | ||
441 | b = ctx->cipher->block_size; | |
442 | OPENSSL_assert(b <= sizeof ctx->final); | |
443 | ||
444 | if (ctx->final_used) { | |
445 | memcpy(out, ctx->final, b); | |
446 | out += b; | |
447 | fix_len = 1; | |
448 | } else | |
449 | fix_len = 0; | |
450 | ||
451 | if (!EVP_EncryptUpdate(ctx, out, outl, in, inl)) | |
452 | return 0; | |
453 | ||
454 | /* | |
455 | * if we have 'decrypted' a multiple of block size, make sure we have a | |
456 | * copy of this last block | |
457 | */ | |
458 | if (b > 1 && !ctx->buf_len) { | |
459 | *outl -= b; | |
460 | ctx->final_used = 1; | |
461 | memcpy(ctx->final, &out[*outl], b); | |
462 | } else | |
463 | ctx->final_used = 0; | |
464 | ||
465 | if (fix_len) | |
466 | *outl += b; | |
467 | ||
468 | return 1; | |
469 | } | |
d02b48c6 | 470 | |
6b691a5c | 471 | int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
0f113f3e MC |
472 | { |
473 | int ret; | |
474 | ret = EVP_DecryptFinal_ex(ctx, out, outl); | |
475 | return ret; | |
476 | } | |
581f1c84 DSH |
477 | |
478 | int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
0f113f3e MC |
479 | { |
480 | int i, n; | |
481 | unsigned int b; | |
482 | *outl = 0; | |
483 | ||
484 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { | |
485 | i = ctx->cipher->do_cipher(ctx, out, NULL, 0); | |
486 | if (i < 0) | |
487 | return 0; | |
488 | else | |
489 | *outl = i; | |
490 | return 1; | |
491 | } | |
492 | ||
493 | b = ctx->cipher->block_size; | |
494 | if (ctx->flags & EVP_CIPH_NO_PADDING) { | |
495 | if (ctx->buf_len) { | |
496 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, | |
497 | EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
498 | return 0; | |
499 | } | |
500 | *outl = 0; | |
501 | return 1; | |
502 | } | |
503 | if (b > 1) { | |
504 | if (ctx->buf_len || !ctx->final_used) { | |
505 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH); | |
506 | return (0); | |
507 | } | |
508 | OPENSSL_assert(b <= sizeof ctx->final); | |
509 | ||
510 | /* | |
511 | * The following assumes that the ciphertext has been authenticated. | |
512 | * Otherwise it provides a padding oracle. | |
513 | */ | |
514 | n = ctx->final[b - 1]; | |
515 | if (n == 0 || n > (int)b) { | |
516 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
517 | return (0); | |
518 | } | |
519 | for (i = 0; i < n; i++) { | |
520 | if (ctx->final[--b] != n) { | |
521 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); | |
522 | return (0); | |
523 | } | |
524 | } | |
525 | n = ctx->cipher->block_size - n; | |
526 | for (i = 0; i < n; i++) | |
527 | out[i] = ctx->final[i]; | |
528 | *outl = n; | |
529 | } else | |
530 | *outl = 0; | |
531 | return (1); | |
532 | } | |
d02b48c6 | 533 | |
6343829a | 534 | int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) |
0f113f3e MC |
535 | { |
536 | if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) | |
537 | return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); | |
538 | if (c->key_len == keylen) | |
539 | return 1; | |
540 | if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) { | |
541 | c->key_len = keylen; | |
542 | return 1; | |
543 | } | |
544 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH); | |
545 | return 0; | |
546 | } | |
49528751 | 547 | |
f2e5ca84 | 548 | int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) |
0f113f3e MC |
549 | { |
550 | if (pad) | |
551 | ctx->flags &= ~EVP_CIPH_NO_PADDING; | |
552 | else | |
553 | ctx->flags |= EVP_CIPH_NO_PADDING; | |
554 | return 1; | |
555 | } | |
f2e5ca84 | 556 | |
49528751 DSH |
557 | int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) |
558 | { | |
0f113f3e MC |
559 | int ret; |
560 | if (!ctx->cipher) { | |
561 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); | |
562 | return 0; | |
563 | } | |
564 | ||
565 | if (!ctx->cipher->ctrl) { | |
566 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); | |
567 | return 0; | |
568 | } | |
569 | ||
570 | ret = ctx->cipher->ctrl(ctx, type, arg, ptr); | |
571 | if (ret == -1) { | |
572 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, | |
573 | EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); | |
574 | return 0; | |
575 | } | |
576 | return ret; | |
49528751 | 577 | } |
216659eb DSH |
578 | |
579 | int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) | |
0f113f3e MC |
580 | { |
581 | if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) | |
582 | return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); | |
583 | if (RAND_bytes(key, ctx->key_len) <= 0) | |
584 | return 0; | |
585 | return 1; | |
586 | } | |
216659eb | 587 | |
c2bf7208 | 588 | int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) |
0f113f3e MC |
589 | { |
590 | if ((in == NULL) || (in->cipher == NULL)) { | |
591 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED); | |
592 | return 0; | |
593 | } | |
c2bf7208 | 594 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
595 | /* Make sure it's safe to copy a cipher context using an ENGINE */ |
596 | if (in->engine && !ENGINE_init(in->engine)) { | |
597 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB); | |
598 | return 0; | |
599 | } | |
c2bf7208 DSH |
600 | #endif |
601 | ||
c0ca39bd | 602 | EVP_CIPHER_CTX_reset(out); |
b4faea50 | 603 | memcpy(out, in, sizeof(*out)); |
0f113f3e MC |
604 | |
605 | if (in->cipher_data && in->cipher->ctx_size) { | |
606 | out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size); | |
90945fa3 | 607 | if (out->cipher_data == NULL) { |
0f113f3e MC |
608 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE); |
609 | return 0; | |
610 | } | |
611 | memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size); | |
612 | } | |
613 | ||
614 | if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) | |
615 | return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out); | |
616 | return 1; | |
617 | } |