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a2dc9b6b DSH |
1 | /* crypto/evp/enc_min.c */ |
2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
3 | * All rights reserved. | |
4 | * | |
5 | * This package is an SSL implementation written | |
6 | * by Eric Young (eay@cryptsoft.com). | |
7 | * The implementation was written so as to conform with Netscapes SSL. | |
40720ce3 | 8 | * |
a2dc9b6b DSH |
9 | * This library is free for commercial and non-commercial use as long as |
10 | * the following conditions are aheared to. The following conditions | |
11 | * apply to all code found in this distribution, be it the RC4, RSA, | |
12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
13 | * included with this distribution is covered by the same copyright terms | |
14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
40720ce3 | 15 | * |
a2dc9b6b DSH |
16 | * Copyright remains Eric Young's, and as such any Copyright notices in |
17 | * the code are not to be removed. | |
18 | * If this package is used in a product, Eric Young should be given attribution | |
19 | * as the author of the parts of the library used. | |
20 | * This can be in the form of a textual message at program startup or | |
21 | * in documentation (online or textual) provided with the package. | |
40720ce3 | 22 | * |
a2dc9b6b DSH |
23 | * Redistribution and use in source and binary forms, with or without |
24 | * modification, are permitted provided that the following conditions | |
25 | * are met: | |
26 | * 1. Redistributions of source code must retain the copyright | |
27 | * notice, this list of conditions and the following disclaimer. | |
28 | * 2. Redistributions in binary form must reproduce the above copyright | |
29 | * notice, this list of conditions and the following disclaimer in the | |
30 | * documentation and/or other materials provided with the distribution. | |
31 | * 3. All advertising materials mentioning features or use of this software | |
32 | * must display the following acknowledgement: | |
33 | * "This product includes cryptographic software written by | |
34 | * Eric Young (eay@cryptsoft.com)" | |
35 | * The word 'cryptographic' can be left out if the rouines from the library | |
36 | * being used are not cryptographic related :-). | |
40720ce3 | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
a2dc9b6b DSH |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
40720ce3 | 40 | * |
a2dc9b6b DSH |
41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 | * SUCH DAMAGE. | |
40720ce3 | 52 | * |
a2dc9b6b DSH |
53 | * The licence and distribution terms for any publically available version or |
54 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
55 | * copied and put under another distribution licence | |
56 | * [including the GNU Public Licence.] | |
57 | */ | |
58 | ||
59 | #include <stdio.h> | |
60 | #include "cryptlib.h" | |
61 | #include <openssl/evp.h> | |
62 | #include <openssl/err.h> | |
63 | #include <openssl/rand.h> | |
64 | #ifndef OPENSSL_NO_ENGINE | |
40720ce3 | 65 | # include <openssl/engine.h> |
a2dc9b6b DSH |
66 | #endif |
67 | #include "evp_locl.h" | |
68 | ||
69 | void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx) | |
40720ce3 | 70 | { |
a2dc9b6b | 71 | #ifdef OPENSSL_FIPS |
40720ce3 | 72 | FIPS_selftest_check(); |
a2dc9b6b | 73 | #endif |
40720ce3 MC |
74 | memset(ctx, 0, sizeof(EVP_CIPHER_CTX)); |
75 | /* ctx->cipher=NULL; */ | |
76 | } | |
a2dc9b6b DSH |
77 | |
78 | #ifdef OPENSSL_FIPS | |
79 | ||
40720ce3 MC |
80 | /* |
81 | * The purpose of these is to trap programs that attempt to use non FIPS | |
a2dc9b6b DSH |
82 | * algorithms in FIPS mode and ignore the errors. |
83 | */ | |
84 | ||
f092a073 | 85 | static int bad_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, |
40720ce3 MC |
86 | const unsigned char *iv, int enc) |
87 | { | |
88 | FIPS_ERROR_IGNORED("Cipher init"); | |
89 | return 0; | |
90 | } | |
a2dc9b6b | 91 | |
f092a073 | 92 | static int bad_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
40720ce3 MC |
93 | const unsigned char *in, unsigned int inl) |
94 | { | |
95 | FIPS_ERROR_IGNORED("Cipher update"); | |
96 | return 0; | |
97 | } | |
a2dc9b6b DSH |
98 | |
99 | /* NB: no cleanup because it is allowed after failed init */ | |
100 | ||
f092a073 | 101 | static int bad_set_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ) |
40720ce3 MC |
102 | { |
103 | FIPS_ERROR_IGNORED("Cipher set_asn1"); | |
104 | return 0; | |
105 | } | |
106 | ||
f092a073 | 107 | static int bad_get_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ) |
40720ce3 MC |
108 | { |
109 | FIPS_ERROR_IGNORED("Cipher get_asn1"); | |
110 | return 0; | |
111 | } | |
112 | ||
f092a073 | 113 | static int bad_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) |
40720ce3 MC |
114 | { |
115 | FIPS_ERROR_IGNORED("Cipher ctrl"); | |
116 | return 0; | |
117 | } | |
118 | ||
119 | static const EVP_CIPHER bad_cipher = { | |
120 | 0, | |
121 | 0, | |
122 | 0, | |
123 | 0, | |
124 | 0, | |
125 | bad_init, | |
126 | bad_do_cipher, | |
127 | NULL, | |
128 | 0, | |
129 | bad_set_asn1, | |
130 | bad_get_asn1, | |
131 | bad_ctrl, | |
132 | NULL | |
133 | }; | |
a2dc9b6b DSH |
134 | |
135 | #endif | |
136 | ||
137 | #ifndef OPENSSL_NO_ENGINE | |
138 | ||
40720ce3 MC |
139 | # ifdef OPENSSL_FIPS |
140 | ||
141 | static int do_engine_null(ENGINE *impl) | |
142 | { | |
143 | return 0; | |
144 | } | |
a2dc9b6b | 145 | |
a2dc9b6b | 146 | static int do_evp_enc_engine_null(EVP_CIPHER_CTX *ctx, |
40720ce3 MC |
147 | const EVP_CIPHER **pciph, ENGINE *impl) |
148 | { | |
149 | return 1; | |
150 | } | |
a2dc9b6b | 151 | |
40720ce3 MC |
152 | static int (*do_engine_finish) (ENGINE *impl) |
153 | = do_engine_null; | |
a2dc9b6b DSH |
154 | |
155 | static int (*do_evp_enc_engine) | |
40720ce3 MC |
156 | (EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl) |
157 | = do_evp_enc_engine_null; | |
158 | ||
159 | void int_EVP_CIPHER_set_engine_callbacks(int (*eng_ciph_fin) (ENGINE *impl), | |
160 | int (*eng_ciph_evp) | |
161 | (EVP_CIPHER_CTX *ctx, | |
162 | const EVP_CIPHER **pciph, | |
163 | ENGINE *impl)) | |
164 | { | |
165 | do_engine_finish = eng_ciph_fin; | |
166 | do_evp_enc_engine = eng_ciph_evp; | |
167 | } | |
a2dc9b6b | 168 | |
40720ce3 MC |
169 | # else |
170 | ||
171 | # define do_engine_finish ENGINE_finish | |
172 | ||
173 | static int do_evp_enc_engine(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher, | |
174 | ENGINE *impl) | |
175 | { | |
176 | if (impl) { | |
177 | if (!ENGINE_init(impl)) { | |
178 | EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERROR); | |
179 | return 0; | |
180 | } | |
181 | } else | |
182 | /* Ask if an ENGINE is reserved for this job */ | |
183 | impl = ENGINE_get_cipher_engine((*pcipher)->nid); | |
184 | if (impl) { | |
185 | /* There's an ENGINE for this job ... (apparently) */ | |
186 | const EVP_CIPHER *c = ENGINE_get_cipher(impl, (*pcipher)->nid); | |
187 | if (!c) { | |
188 | /* | |
189 | * One positive side-effect of US's export control history, is | |
190 | * that we should at least be able to avoid using US mispellings | |
191 | * of "initialisation"? | |
192 | */ | |
193 | EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERROR); | |
194 | return 0; | |
195 | } | |
196 | /* We'll use the ENGINE's private cipher definition */ | |
197 | *pcipher = c; | |
198 | /* | |
199 | * Store the ENGINE functional reference so we know 'cipher' came | |
200 | * from an ENGINE and we need to release it when done. | |
201 | */ | |
202 | ctx->engine = impl; | |
203 | } else | |
204 | ctx->engine = NULL; | |
205 | return 1; | |
206 | } | |
207 | ||
208 | # endif | |
a2dc9b6b DSH |
209 | |
210 | #endif | |
211 | ||
40720ce3 MC |
212 | int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
213 | ENGINE *impl, const unsigned char *key, | |
214 | const unsigned char *iv, int enc) | |
215 | { | |
216 | if (enc == -1) | |
217 | enc = ctx->encrypt; | |
218 | else { | |
219 | if (enc) | |
220 | enc = 1; | |
221 | ctx->encrypt = enc; | |
222 | } | |
e26ad0c4 | 223 | #ifdef OPENSSL_FIPS |
40720ce3 MC |
224 | if (FIPS_selftest_failed()) { |
225 | FIPSerr(FIPS_F_EVP_CIPHERINIT_EX, FIPS_R_FIPS_SELFTEST_FAILED); | |
226 | ctx->cipher = &bad_cipher; | |
227 | return 0; | |
228 | } | |
a2dc9b6b DSH |
229 | #endif |
230 | #ifndef OPENSSL_NO_ENGINE | |
40720ce3 MC |
231 | /* |
232 | * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so | |
233 | * this context may already have an ENGINE! Try to avoid releasing the | |
234 | * previous handle, re-querying for an ENGINE, and having a | |
235 | * reinitialisation, when it may all be unecessary. | |
236 | */ | |
237 | if (ctx->engine && ctx->cipher && (!cipher || | |
238 | (cipher | |
239 | && (cipher->nid == | |
240 | ctx->cipher->nid)))) | |
241 | goto skip_to_init; | |
a2dc9b6b | 242 | #endif |
40720ce3 MC |
243 | if (cipher) { |
244 | /* | |
245 | * Ensure a context left lying around from last time is cleared (the | |
246 | * previous check attempted to avoid this if the same ENGINE and | |
247 | * EVP_CIPHER could be used). | |
248 | */ | |
249 | EVP_CIPHER_CTX_cleanup(ctx); | |
250 | ||
251 | /* Restore encrypt field: it is zeroed by cleanup */ | |
252 | ctx->encrypt = enc; | |
a2dc9b6b | 253 | #ifndef OPENSSL_NO_ENGINE |
40720ce3 MC |
254 | if (!do_evp_enc_engine(ctx, &cipher, impl)) |
255 | return 0; | |
a2dc9b6b DSH |
256 | #endif |
257 | ||
40720ce3 MC |
258 | ctx->cipher = cipher; |
259 | if (ctx->cipher->ctx_size) { | |
260 | ctx->cipher_data = OPENSSL_malloc(ctx->cipher->ctx_size); | |
261 | if (!ctx->cipher_data) { | |
262 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); | |
263 | return 0; | |
264 | } | |
265 | } else { | |
266 | ctx->cipher_data = NULL; | |
267 | } | |
268 | ctx->key_len = cipher->key_len; | |
269 | ctx->flags = 0; | |
270 | if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { | |
271 | if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { | |
272 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
273 | return 0; | |
274 | } | |
275 | } | |
276 | } else if (!ctx->cipher) { | |
277 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); | |
278 | return 0; | |
279 | } | |
a2dc9b6b | 280 | #ifndef OPENSSL_NO_ENGINE |
40720ce3 | 281 | skip_to_init: |
a2dc9b6b | 282 | #endif |
40720ce3 MC |
283 | /* we assume block size is a power of 2 in *cryptUpdate */ |
284 | OPENSSL_assert(ctx->cipher->block_size == 1 | |
285 | || ctx->cipher->block_size == 8 | |
286 | || ctx->cipher->block_size == 16); | |
287 | ||
288 | if (!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) { | |
289 | switch (EVP_CIPHER_CTX_mode(ctx)) { | |
290 | ||
291 | case EVP_CIPH_STREAM_CIPHER: | |
292 | case EVP_CIPH_ECB_MODE: | |
293 | break; | |
294 | ||
295 | case EVP_CIPH_CFB_MODE: | |
296 | case EVP_CIPH_OFB_MODE: | |
297 | ||
298 | ctx->num = 0; | |
299 | /* fall-through */ | |
300 | ||
301 | case EVP_CIPH_CBC_MODE: | |
302 | ||
303 | OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= | |
304 | (int)sizeof(ctx->iv)); | |
305 | if (iv) | |
306 | memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
307 | memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); | |
308 | break; | |
309 | ||
310 | default: | |
311 | return 0; | |
312 | break; | |
313 | } | |
314 | } | |
a2dc9b6b | 315 | #ifdef OPENSSL_FIPS |
40720ce3 MC |
316 | /* |
317 | * After 'key' is set no further parameters changes are permissible. So | |
318 | * only check for non FIPS enabling at this point. | |
319 | */ | |
320 | if (key && FIPS_mode()) { | |
321 | if (!(ctx->cipher->flags & EVP_CIPH_FLAG_FIPS) | |
322 | & !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)) { | |
323 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_DISABLED_FOR_FIPS); | |
324 | # if 0 | |
325 | ERR_add_error_data(2, "cipher=", EVP_CIPHER_name(ctx->cipher)); | |
326 | # endif | |
327 | ctx->cipher = &bad_cipher; | |
328 | return 0; | |
329 | } | |
330 | } | |
a2dc9b6b DSH |
331 | #endif |
332 | ||
40720ce3 MC |
333 | if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { |
334 | if (!ctx->cipher->init(ctx, key, iv, enc)) | |
335 | return 0; | |
336 | } | |
337 | ctx->buf_len = 0; | |
338 | ctx->final_used = 0; | |
339 | ctx->block_mask = ctx->cipher->block_size - 1; | |
340 | return 1; | |
341 | } | |
a2dc9b6b DSH |
342 | |
343 | int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) | |
40720ce3 MC |
344 | { |
345 | if (c->cipher != NULL) { | |
346 | if (c->cipher->cleanup && !c->cipher->cleanup(c)) | |
347 | return 0; | |
348 | /* Cleanse cipher context data */ | |
349 | if (c->cipher_data) | |
350 | OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); | |
351 | } | |
352 | if (c->cipher_data) | |
353 | OPENSSL_free(c->cipher_data); | |
a2dc9b6b | 354 | #ifndef OPENSSL_NO_ENGINE |
40720ce3 MC |
355 | if (c->engine) |
356 | /* | |
357 | * The EVP_CIPHER we used belongs to an ENGINE, release the | |
358 | * functional reference we held for this reason. | |
359 | */ | |
360 | do_engine_finish(c->engine); | |
a2dc9b6b | 361 | #endif |
40720ce3 MC |
362 | memset(c, 0, sizeof(EVP_CIPHER_CTX)); |
363 | return 1; | |
364 | } | |
a2dc9b6b | 365 | |
40720ce3 MC |
366 | int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
367 | const unsigned char *in, unsigned int inl) | |
368 | { | |
a2dc9b6b | 369 | #ifdef OPENSSL_FIPS |
40720ce3 | 370 | FIPS_selftest_check(); |
a2dc9b6b | 371 | #endif |
40720ce3 MC |
372 | return ctx->cipher->do_cipher(ctx, out, in, inl); |
373 | } | |
a2dc9b6b DSH |
374 | |
375 | int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) | |
376 | { | |
40720ce3 MC |
377 | int ret; |
378 | if (!ctx->cipher) { | |
379 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); | |
380 | return 0; | |
381 | } | |
382 | ||
383 | if (!ctx->cipher->ctrl) { | |
384 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); | |
385 | return 0; | |
386 | } | |
387 | ||
388 | ret = ctx->cipher->ctrl(ctx, type, arg, ptr); | |
389 | if (ret == -1) { | |
390 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, | |
391 | EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); | |
392 | return 0; | |
393 | } | |
394 | return ret; | |
a2dc9b6b DSH |
395 | } |
396 | ||
397 | unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx) | |
40720ce3 MC |
398 | { |
399 | return ctx->cipher->flags; | |
400 | } | |
a2dc9b6b DSH |
401 | |
402 | int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx) | |
40720ce3 MC |
403 | { |
404 | return ctx->cipher->iv_len; | |
405 | } | |
a2dc9b6b DSH |
406 | |
407 | int EVP_CIPHER_nid(const EVP_CIPHER *cipher) | |
40720ce3 MC |
408 | { |
409 | return cipher->nid; | |
410 | } |