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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. | |
8 * | |
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). | |
15 * | |
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. | |
22 * | |
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 :-). | |
37 * 4. If you include any Windows specific code (or a derivative thereof) from | |
38 * the apps directory (application code) you must include an acknowledgement: | |
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
40 * | |
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. | |
52 * | |
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 | |
65 #include <openssl/engine.h> | |
66 #endif | |
67 #include "evp_locl.h" | |
68 | |
69 void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx) | |
70 { | |
71 #ifdef OPENSSL_FIPS | |
72 FIPS_selftest_check(); | |
73 #endif | |
74 memset(ctx,0,sizeof(EVP_CIPHER_CTX)); | |
75 /* ctx->cipher=NULL; */ | |
76 } | |
77 | |
78 #ifdef OPENSSL_FIPS | |
79 | |
80 /* The purpose of these is to trap programs that attempt to use non FIPS | |
81 * algorithms in FIPS mode and ignore the errors. | |
82 */ | |
83 | |
84 static int bad_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, | |
85 const unsigned char *iv, int enc) | |
86 { FIPS_ERROR_IGNORED("Cipher init"); return 0;} | |
87 | |
88 static int bad_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, | |
89 const unsigned char *in, unsigned int inl) | |
90 { FIPS_ERROR_IGNORED("Cipher update"); return 0;} | |
91 | |
92 /* NB: no cleanup because it is allowed after failed init */ | |
93 | |
94 static int bad_set_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ) | |
95 { FIPS_ERROR_IGNORED("Cipher set_asn1"); return 0;} | |
96 static int bad_get_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ) | |
97 { FIPS_ERROR_IGNORED("Cipher get_asn1"); return 0;} | |
98 static int bad_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) | |
99 { FIPS_ERROR_IGNORED("Cipher ctrl"); return 0;} | |
100 | |
101 static const EVP_CIPHER bad_cipher = | |
102 { | |
103 0, | |
104 0, | |
105 0, | |
106 0, | |
107 0, | |
108 bad_init, | |
109 bad_do_cipher, | |
110 NULL, | |
111 0, | |
112 bad_set_asn1, | |
113 bad_get_asn1, | |
114 bad_ctrl, | |
115 NULL | |
116 }; | |
117 | |
118 #endif | |
119 | |
120 #ifndef OPENSSL_NO_ENGINE | |
121 | |
122 #ifdef OPENSSL_FIPS | |
123 | |
124 static int do_engine_null(ENGINE *impl) { return 0;} | |
125 static int do_evp_enc_engine_null(EVP_CIPHER_CTX *ctx, | |
126 const EVP_CIPHER **pciph, ENGINE *impl) | |
127 { return 1; } | |
128 | |
129 static int (*do_engine_finish)(ENGINE *impl) | |
130 = do_engine_null; | |
131 | |
132 static int (*do_evp_enc_engine) | |
133 (EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl) | |
134 = do_evp_enc_engine_null; | |
135 | |
136 void int_EVP_CIPHER_set_engine_callbacks( | |
137 int (*eng_ciph_fin)(ENGINE *impl), | |
138 int (*eng_ciph_evp) | |
139 (EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl)) | |
140 { | |
141 do_engine_finish = eng_ciph_fin; | |
142 do_evp_enc_engine = eng_ciph_evp; | |
143 } | |
144 | |
145 #else | |
146 | |
147 #define do_engine_finish ENGINE_finish | |
148 | |
149 static int do_evp_enc_engine(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher, EN
GINE *impl) | |
150 { | |
151 if(impl) | |
152 { | |
153 if (!ENGINE_init(impl)) | |
154 { | |
155 EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERR
OR); | |
156 return 0; | |
157 } | |
158 } | |
159 else | |
160 /* Ask if an ENGINE is reserved for this job */ | |
161 impl = ENGINE_get_cipher_engine((*pcipher)->nid); | |
162 if(impl) | |
163 { | |
164 /* There's an ENGINE for this job ... (apparently) */ | |
165 const EVP_CIPHER *c = ENGINE_get_cipher(impl, (*pcipher)->nid); | |
166 if(!c) | |
167 { | |
168 /* One positive side-effect of US's export | |
169 * control history, is that we should at least | |
170 * be able to avoid using US mispellings of | |
171 * "initialisation"? */ | |
172 EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERR
OR); | |
173 return 0; | |
174 } | |
175 /* We'll use the ENGINE's private cipher definition */ | |
176 *pcipher = c; | |
177 /* Store the ENGINE functional reference so we know | |
178 * 'cipher' came from an ENGINE and we need to release | |
179 * it when done. */ | |
180 ctx->engine = impl; | |
181 } | |
182 else | |
183 ctx->engine = NULL; | |
184 return 1; | |
185 } | |
186 | |
187 #endif | |
188 | |
189 #endif | |
190 | |
191 int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *imp
l, | |
192 const unsigned char *key, const unsigned char *iv, int enc) | |
193 { | |
194 if (enc == -1) | |
195 enc = ctx->encrypt; | |
196 else | |
197 { | |
198 if (enc) | |
199 enc = 1; | |
200 ctx->encrypt = enc; | |
201 } | |
202 #ifdef OPENSSL_FIPS | |
203 if(FIPS_selftest_failed()) | |
204 { | |
205 FIPSerr(FIPS_F_EVP_CIPHERINIT_EX,FIPS_R_FIPS_SELFTEST_FAILED); | |
206 ctx->cipher = &bad_cipher; | |
207 return 0; | |
208 } | |
209 #endif | |
210 #ifndef OPENSSL_NO_ENGINE | |
211 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts | |
212 * so this context may already have an ENGINE! Try to avoid releasing | |
213 * the previous handle, re-querying for an ENGINE, and having a | |
214 * reinitialisation, when it may all be unecessary. */ | |
215 if (ctx->engine && ctx->cipher && (!cipher || | |
216 (cipher && (cipher->nid == ctx->cipher->nid)))) | |
217 goto skip_to_init; | |
218 #endif | |
219 if (cipher) | |
220 { | |
221 /* Ensure a context left lying around from last time is cleared | |
222 * (the previous check attempted to avoid this if the same | |
223 * ENGINE and EVP_CIPHER could be used). */ | |
224 EVP_CIPHER_CTX_cleanup(ctx); | |
225 | |
226 /* Restore encrypt field: it is zeroed by cleanup */ | |
227 ctx->encrypt = enc; | |
228 #ifndef OPENSSL_NO_ENGINE | |
229 if (!do_evp_enc_engine(ctx, &cipher, impl)) | |
230 return 0; | |
231 #endif | |
232 | |
233 ctx->cipher=cipher; | |
234 if (ctx->cipher->ctx_size) | |
235 { | |
236 ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size); | |
237 if (!ctx->cipher_data) | |
238 { | |
239 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAI
LURE); | |
240 return 0; | |
241 } | |
242 } | |
243 else | |
244 { | |
245 ctx->cipher_data = NULL; | |
246 } | |
247 ctx->key_len = cipher->key_len; | |
248 ctx->flags = 0; | |
249 if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT) | |
250 { | |
251 if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) | |
252 { | |
253 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZA
TION_ERROR); | |
254 return 0; | |
255 } | |
256 } | |
257 } | |
258 else if(!ctx->cipher) | |
259 { | |
260 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); | |
261 return 0; | |
262 } | |
263 #ifndef OPENSSL_NO_ENGINE | |
264 skip_to_init: | |
265 #endif | |
266 /* we assume block size is a power of 2 in *cryptUpdate */ | |
267 OPENSSL_assert(ctx->cipher->block_size == 1 | |
268 || ctx->cipher->block_size == 8 | |
269 || ctx->cipher->block_size == 16); | |
270 | |
271 if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) { | |
272 switch(EVP_CIPHER_CTX_mode(ctx)) { | |
273 | |
274 case EVP_CIPH_STREAM_CIPHER: | |
275 case EVP_CIPH_ECB_MODE: | |
276 break; | |
277 | |
278 case EVP_CIPH_CFB_MODE: | |
279 case EVP_CIPH_OFB_MODE: | |
280 | |
281 ctx->num = 0; | |
282 | |
283 case EVP_CIPH_CBC_MODE: | |
284 | |
285 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= | |
286 (int)sizeof(ctx->iv)); | |
287 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx
)); | |
288 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx))
; | |
289 break; | |
290 | |
291 default: | |
292 return 0; | |
293 break; | |
294 } | |
295 } | |
296 | |
297 #ifdef OPENSSL_FIPS | |
298 /* After 'key' is set no further parameters changes are permissible. | |
299 * So only check for non FIPS enabling at this point. | |
300 */ | |
301 if (key && FIPS_mode()) | |
302 { | |
303 if (!(ctx->cipher->flags & EVP_CIPH_FLAG_FIPS) | |
304 & !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)) | |
305 { | |
306 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_DISABLED_FOR_FIPS)
; | |
307 #if 0 | |
308 ERR_add_error_data(2, "cipher=", | |
309 EVP_CIPHER_name(ctx->cipher)); | |
310 #endif | |
311 ctx->cipher = &bad_cipher; | |
312 return 0; | |
313 } | |
314 } | |
315 #endif | |
316 | |
317 if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { | |
318 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0; | |
319 } | |
320 ctx->buf_len=0; | |
321 ctx->final_used=0; | |
322 ctx->block_mask=ctx->cipher->block_size-1; | |
323 return 1; | |
324 } | |
325 | |
326 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) | |
327 { | |
328 if (c->cipher != NULL) | |
329 { | |
330 if(c->cipher->cleanup && !c->cipher->cleanup(c)) | |
331 return 0; | |
332 /* Cleanse cipher context data */ | |
333 if (c->cipher_data) | |
334 OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); | |
335 } | |
336 if (c->cipher_data) | |
337 OPENSSL_free(c->cipher_data); | |
338 #ifndef OPENSSL_NO_ENGINE | |
339 if (c->engine) | |
340 /* The EVP_CIPHER we used belongs to an ENGINE, release the | |
341 * functional reference we held for this reason. */ | |
342 do_engine_finish(c->engine); | |
343 #endif | |
344 memset(c,0,sizeof(EVP_CIPHER_CTX)); | |
345 return 1; | |
346 } | |
347 | |
348 int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in,
unsigned int inl) | |
349 { | |
350 #ifdef OPENSSL_FIPS | |
351 FIPS_selftest_check(); | |
352 #endif | |
353 return ctx->cipher->do_cipher(ctx,out,in,inl); | |
354 } | |
355 | |
356 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) | |
357 { | |
358 int ret; | |
359 if(!ctx->cipher) { | |
360 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); | |
361 return 0; | |
362 } | |
363 | |
364 if(!ctx->cipher->ctrl) { | |
365 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); | |
366 return 0; | |
367 } | |
368 | |
369 ret = ctx->cipher->ctrl(ctx, type, arg, ptr); | |
370 if(ret == -1) { | |
371 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLE
MENTED); | |
372 return 0; | |
373 } | |
374 return ret; | |
375 } | |
376 | |
377 unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx) | |
378 { | |
379 return ctx->cipher->flags; | |
380 } | |
381 | |
382 int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx) | |
383 { | |
384 return ctx->cipher->iv_len; | |
385 } | |
386 | |
387 int EVP_CIPHER_nid(const EVP_CIPHER *cipher) | |
388 { | |
389 return cipher->nid; | |
390 } | |
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