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d02b48c6 | 1 | /* crypto/evp/evp_enc.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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" | |
ec577822 | 61 | #include <openssl/evp.h> |
7f060601 | 62 | #include <openssl/err.h> |
3a87a9b9 | 63 | #include <openssl/rand.h> |
0b13e9f0 | 64 | #ifndef OPENSSL_NO_ENGINE |
11a57c7b | 65 | #include <openssl/engine.h> |
0b13e9f0 | 66 | #endif |
57ae2e24 | 67 | #include "evp_locl.h" |
d02b48c6 | 68 | |
560b79cb | 69 | const char EVP_version[]="EVP" OPENSSL_VERSION_PTEXT; |
58964a49 | 70 | |
6b691a5c | 71 | void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx) |
58964a49 RE |
72 | { |
73 | memset(ctx,0,sizeof(EVP_CIPHER_CTX)); | |
74 | /* ctx->cipher=NULL; */ | |
75 | } | |
d02b48c6 | 76 | |
b40228a6 DSH |
77 | EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) |
78 | { | |
79 | EVP_CIPHER_CTX *ctx=OPENSSL_malloc(sizeof *ctx); | |
80 | if (ctx) | |
81 | EVP_CIPHER_CTX_init(ctx); | |
82 | return ctx; | |
83 | } | |
581f1c84 | 84 | |
360370d9 | 85 | int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0e360199 | 86 | const unsigned char *key, const unsigned char *iv, int enc) |
d02b48c6 | 87 | { |
a3829cb7 DSH |
88 | if (cipher) |
89 | EVP_CIPHER_CTX_init(ctx); | |
11a57c7b GT |
90 | return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc); |
91 | } | |
581f1c84 | 92 | |
11a57c7b GT |
93 | int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl, |
94 | const unsigned char *key, const unsigned char *iv, int enc) | |
95 | { | |
3e268d27 DSH |
96 | if (enc == -1) |
97 | enc = ctx->encrypt; | |
98 | else | |
99 | { | |
100 | if (enc) | |
101 | enc = 1; | |
102 | ctx->encrypt = enc; | |
103 | } | |
0b13e9f0 | 104 | #ifndef OPENSSL_NO_ENGINE |
11a57c7b GT |
105 | /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts |
106 | * so this context may already have an ENGINE! Try to avoid releasing | |
107 | * the previous handle, re-querying for an ENGINE, and having a | |
108 | * reinitialisation, when it may all be unecessary. */ | |
109 | if (ctx->engine && ctx->cipher && (!cipher || | |
110 | (cipher && (cipher->nid == ctx->cipher->nid)))) | |
111 | goto skip_to_init; | |
0b13e9f0 | 112 | #endif |
dbad1690 BL |
113 | if (cipher) |
114 | { | |
544a2aea | 115 | /* Ensure a context left lying around from last time is cleared |
11a57c7b GT |
116 | * (the previous check attempted to avoid this if the same |
117 | * ENGINE and EVP_CIPHER could be used). */ | |
f94cfe6a DSH |
118 | if (ctx->cipher) |
119 | { | |
120 | unsigned long flags = ctx->flags; | |
121 | EVP_CIPHER_CTX_cleanup(ctx); | |
122 | /* Restore encrypt and flags */ | |
123 | ctx->encrypt = enc; | |
124 | ctx->flags = flags; | |
125 | } | |
0b13e9f0 | 126 | #ifndef OPENSSL_NO_ENGINE |
bf6a9e66 DSH |
127 | if(impl) |
128 | { | |
129 | if (!ENGINE_init(impl)) | |
130 | { | |
8afca8d9 | 131 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); |
bf6a9e66 DSH |
132 | return 0; |
133 | } | |
134 | } | |
135 | else | |
11a57c7b GT |
136 | /* Ask if an ENGINE is reserved for this job */ |
137 | impl = ENGINE_get_cipher_engine(cipher->nid); | |
138 | if(impl) | |
139 | { | |
140 | /* There's an ENGINE for this job ... (apparently) */ | |
141 | const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid); | |
142 | if(!c) | |
143 | { | |
144 | /* One positive side-effect of US's export | |
145 | * control history, is that we should at least | |
146 | * be able to avoid using US mispellings of | |
147 | * "initialisation"? */ | |
8afca8d9 | 148 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); |
11a57c7b GT |
149 | return 0; |
150 | } | |
151 | /* We'll use the ENGINE's private cipher definition */ | |
152 | cipher = c; | |
153 | /* Store the ENGINE functional reference so we know | |
154 | * 'cipher' came from an ENGINE and we need to release | |
155 | * it when done. */ | |
156 | ctx->engine = impl; | |
157 | } | |
158 | else | |
159 | ctx->engine = NULL; | |
0b13e9f0 | 160 | #endif |
544a2aea | 161 | |
360370d9 | 162 | ctx->cipher=cipher; |
2fe9ab8e | 163 | if (ctx->cipher->ctx_size) |
1145e038 | 164 | { |
2fe9ab8e RL |
165 | ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size); |
166 | if (!ctx->cipher_data) | |
167 | { | |
8afca8d9 | 168 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); |
2fe9ab8e RL |
169 | return 0; |
170 | } | |
171 | } | |
172 | else | |
173 | { | |
174 | ctx->cipher_data = NULL; | |
1145e038 | 175 | } |
360370d9 | 176 | ctx->key_len = cipher->key_len; |
97cf1f6c DSH |
177 | /* Preserve wrap enable flag, zero everything else */ |
178 | ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW; | |
11a57c7b GT |
179 | if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT) |
180 | { | |
181 | if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) | |
182 | { | |
8afca8d9 | 183 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); |
49528751 | 184 | return 0; |
11a57c7b | 185 | } |
49528751 DSH |
186 | } |
187 | } | |
11a57c7b GT |
188 | else if(!ctx->cipher) |
189 | { | |
8afca8d9 | 190 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); |
360370d9 | 191 | return 0; |
11a57c7b | 192 | } |
0b13e9f0 | 193 | #ifndef OPENSSL_NO_ENGINE |
11a57c7b | 194 | skip_to_init: |
0b13e9f0 | 195 | #endif |
f31b1250 | 196 | /* we assume block size is a power of 2 in *cryptUpdate */ |
54a656ef BL |
197 | OPENSSL_assert(ctx->cipher->block_size == 1 |
198 | || ctx->cipher->block_size == 8 | |
199 | || ctx->cipher->block_size == 16); | |
f31b1250 | 200 | |
97cf1f6c DSH |
201 | if(!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW) |
202 | && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) | |
203 | { | |
204 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED); | |
205 | return 0; | |
206 | } | |
207 | ||
360370d9 DSH |
208 | if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) { |
209 | switch(EVP_CIPHER_CTX_mode(ctx)) { | |
210 | ||
211 | case EVP_CIPH_STREAM_CIPHER: | |
212 | case EVP_CIPH_ECB_MODE: | |
213 | break; | |
214 | ||
215 | case EVP_CIPH_CFB_MODE: | |
216 | case EVP_CIPH_OFB_MODE: | |
217 | ||
218 | ctx->num = 0; | |
776654ad | 219 | /* fall-through */ |
360370d9 DSH |
220 | |
221 | case EVP_CIPH_CBC_MODE: | |
222 | ||
27545970 GT |
223 | OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= |
224 | (int)sizeof(ctx->iv)); | |
6343829a | 225 | if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); |
2948fbab DSH |
226 | memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); |
227 | break; | |
228 | ||
229 | case EVP_CIPH_CTR_MODE: | |
bf6d2f98 | 230 | ctx->num = 0; |
081464fa | 231 | /* Don't reuse IV for CTR mode */ |
2948fbab DSH |
232 | if(iv) |
233 | memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
360370d9 DSH |
234 | break; |
235 | ||
236 | default: | |
237 | return 0; | |
238 | break; | |
239 | } | |
240 | } | |
97cf1f6c | 241 | |
360370d9 DSH |
242 | |
243 | if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { | |
244 | if(!ctx->cipher->init(ctx,key,iv,enc)) return 0; | |
245 | } | |
360370d9 | 246 | ctx->buf_len=0; |
c148d709 BL |
247 | ctx->final_used=0; |
248 | ctx->block_mask=ctx->cipher->block_size-1; | |
360370d9 | 249 | return 1; |
d02b48c6 RE |
250 | } |
251 | ||
be06a934 | 252 | int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
6343829a | 253 | const unsigned char *in, int inl) |
d02b48c6 RE |
254 | { |
255 | if (ctx->encrypt) | |
be06a934 DSH |
256 | return EVP_EncryptUpdate(ctx,out,outl,in,inl); |
257 | else return EVP_DecryptUpdate(ctx,out,outl,in,inl); | |
d02b48c6 RE |
258 | } |
259 | ||
581f1c84 DSH |
260 | int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
261 | { | |
262 | if (ctx->encrypt) | |
263 | return EVP_EncryptFinal_ex(ctx,out,outl); | |
264 | else return EVP_DecryptFinal_ex(ctx,out,outl); | |
265 | } | |
266 | ||
6b691a5c | 267 | int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
d02b48c6 RE |
268 | { |
269 | if (ctx->encrypt) | |
be06a934 | 270 | return EVP_EncryptFinal(ctx,out,outl); |
11a57c7b | 271 | else return EVP_DecryptFinal(ctx,out,outl); |
d02b48c6 RE |
272 | } |
273 | ||
be06a934 | 274 | int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0e360199 | 275 | const unsigned char *key, const unsigned char *iv) |
d02b48c6 | 276 | { |
581f1c84 | 277 | return EVP_CipherInit(ctx, cipher, key, iv, 1); |
18eda732 GT |
278 | } |
279 | ||
280 | int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl, | |
281 | const unsigned char *key, const unsigned char *iv) | |
282 | { | |
283 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); | |
d02b48c6 RE |
284 | } |
285 | ||
be06a934 | 286 | int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0e360199 | 287 | const unsigned char *key, const unsigned char *iv) |
d02b48c6 | 288 | { |
59ae8c94 | 289 | return EVP_CipherInit(ctx, cipher, key, iv, 0); |
18eda732 GT |
290 | } |
291 | ||
292 | int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl, | |
293 | const unsigned char *key, const unsigned char *iv) | |
294 | { | |
295 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); | |
d02b48c6 RE |
296 | } |
297 | ||
be06a934 | 298 | int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
6343829a | 299 | const unsigned char *in, int inl) |
d02b48c6 | 300 | { |
6343829a | 301 | int i,j,bl; |
d02b48c6 | 302 | |
3da0ca79 DSH |
303 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) |
304 | { | |
305 | i = ctx->cipher->do_cipher(ctx, out, in, inl); | |
306 | if (i < 0) | |
307 | return 0; | |
308 | else | |
309 | *outl = i; | |
310 | return 1; | |
311 | } | |
312 | ||
2e415778 BM |
313 | if (inl <= 0) |
314 | { | |
315 | *outl = 0; | |
316 | return inl == 0; | |
317 | } | |
318 | ||
c148d709 | 319 | if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0) |
7b6055d1 BL |
320 | { |
321 | if(ctx->cipher->do_cipher(ctx,out,in,inl)) | |
322 | { | |
323 | *outl=inl; | |
324 | return 1; | |
325 | } | |
326 | else | |
327 | { | |
328 | *outl=0; | |
329 | return 0; | |
330 | } | |
331 | } | |
c148d709 BL |
332 | i=ctx->buf_len; |
333 | bl=ctx->cipher->block_size; | |
27545970 | 334 | OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); |
d02b48c6 RE |
335 | if (i != 0) |
336 | { | |
337 | if (i+inl < bl) | |
338 | { | |
339 | memcpy(&(ctx->buf[i]),in,inl); | |
340 | ctx->buf_len+=inl; | |
c148d709 | 341 | *outl=0; |
be06a934 | 342 | return 1; |
d02b48c6 RE |
343 | } |
344 | else | |
345 | { | |
346 | j=bl-i; | |
c148d709 | 347 | memcpy(&(ctx->buf[i]),in,j); |
be06a934 | 348 | if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0; |
d02b48c6 RE |
349 | inl-=j; |
350 | in+=j; | |
351 | out+=bl; | |
c148d709 | 352 | *outl=bl; |
d02b48c6 RE |
353 | } |
354 | } | |
dc706cd3 DSH |
355 | else |
356 | *outl = 0; | |
f31b1250 | 357 | i=inl&(bl-1); |
d02b48c6 RE |
358 | inl-=i; |
359 | if (inl > 0) | |
360 | { | |
be06a934 | 361 | if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0; |
d02b48c6 RE |
362 | *outl+=inl; |
363 | } | |
364 | ||
365 | if (i != 0) | |
366 | memcpy(ctx->buf,&(in[inl]),i); | |
367 | ctx->buf_len=i; | |
be06a934 | 368 | return 1; |
d02b48c6 RE |
369 | } |
370 | ||
be06a934 | 371 | int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
581f1c84 DSH |
372 | { |
373 | int ret; | |
374 | ret = EVP_EncryptFinal_ex(ctx, out, outl); | |
581f1c84 DSH |
375 | return ret; |
376 | } | |
377 | ||
378 | int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
d02b48c6 | 379 | { |
27545970 GT |
380 | int n,ret; |
381 | unsigned int i, b, bl; | |
d02b48c6 | 382 | |
3da0ca79 DSH |
383 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) |
384 | { | |
4fc02f12 DSH |
385 | ret = ctx->cipher->do_cipher(ctx, out, NULL, 0); |
386 | if (ret < 0) | |
3da0ca79 | 387 | return 0; |
d45087c6 | 388 | else |
4fc02f12 | 389 | *outl = ret; |
3da0ca79 DSH |
390 | return 1; |
391 | } | |
392 | ||
d02b48c6 | 393 | b=ctx->cipher->block_size; |
54a656ef | 394 | OPENSSL_assert(b <= sizeof ctx->buf); |
d02b48c6 RE |
395 | if (b == 1) |
396 | { | |
397 | *outl=0; | |
be06a934 | 398 | return 1; |
d02b48c6 RE |
399 | } |
400 | bl=ctx->buf_len; | |
f2e5ca84 DSH |
401 | if (ctx->flags & EVP_CIPH_NO_PADDING) |
402 | { | |
403 | if(bl) | |
404 | { | |
8afca8d9 | 405 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); |
f2e5ca84 DSH |
406 | return 0; |
407 | } | |
408 | *outl = 0; | |
409 | return 1; | |
410 | } | |
f0446ca8 | 411 | |
d02b48c6 RE |
412 | n=b-bl; |
413 | for (i=bl; i<b; i++) | |
414 | ctx->buf[i]=n; | |
f0446ca8 BL |
415 | ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b); |
416 | ||
f0446ca8 BL |
417 | |
418 | if(ret) | |
419 | *outl=b; | |
420 | ||
421 | return ret; | |
d02b48c6 RE |
422 | } |
423 | ||
be06a934 | 424 | int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
6343829a | 425 | const unsigned char *in, int inl) |
d02b48c6 | 426 | { |
27545970 GT |
427 | int fix_len; |
428 | unsigned int b; | |
d02b48c6 | 429 | |
3da0ca79 DSH |
430 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) |
431 | { | |
432 | fix_len = ctx->cipher->do_cipher(ctx, out, in, inl); | |
433 | if (fix_len < 0) | |
434 | { | |
435 | *outl = 0; | |
436 | return 0; | |
437 | } | |
438 | else | |
439 | *outl = fix_len; | |
440 | return 1; | |
441 | } | |
442 | ||
2e415778 | 443 | if (inl <= 0) |
c148d709 | 444 | { |
2e415778 BM |
445 | *outl = 0; |
446 | return inl == 0; | |
c148d709 | 447 | } |
d02b48c6 | 448 | |
f2e5ca84 DSH |
449 | if (ctx->flags & EVP_CIPH_NO_PADDING) |
450 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
451 | ||
d02b48c6 | 452 | b=ctx->cipher->block_size; |
54a656ef | 453 | OPENSSL_assert(b <= sizeof ctx->final); |
f329b8d7 | 454 | |
c148d709 | 455 | if(ctx->final_used) |
d02b48c6 | 456 | { |
c148d709 BL |
457 | memcpy(out,ctx->final,b); |
458 | out+=b; | |
f329b8d7 | 459 | fix_len = 1; |
d02b48c6 | 460 | } |
f329b8d7 DSH |
461 | else |
462 | fix_len = 0; | |
463 | ||
464 | ||
c148d709 BL |
465 | if(!EVP_EncryptUpdate(ctx,out,outl,in,inl)) |
466 | return 0; | |
d02b48c6 RE |
467 | |
468 | /* if we have 'decrypted' a multiple of block size, make sure | |
469 | * we have a copy of this last block */ | |
c148d709 | 470 | if (b > 1 && !ctx->buf_len) |
d02b48c6 | 471 | { |
f329b8d7 DSH |
472 | *outl-=b; |
473 | ctx->final_used=1; | |
c148d709 BL |
474 | memcpy(ctx->final,&out[*outl],b); |
475 | } | |
f329b8d7 DSH |
476 | else |
477 | ctx->final_used = 0; | |
478 | ||
479 | if (fix_len) | |
480 | *outl += b; | |
481 | ||
be06a934 | 482 | return 1; |
d02b48c6 RE |
483 | } |
484 | ||
6b691a5c | 485 | int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
581f1c84 DSH |
486 | { |
487 | int ret; | |
488 | ret = EVP_DecryptFinal_ex(ctx, out, outl); | |
581f1c84 DSH |
489 | return ret; |
490 | } | |
491 | ||
492 | int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
d02b48c6 | 493 | { |
4ad2d3ac EK |
494 | int i,n; |
495 | unsigned int b; | |
d02b48c6 | 496 | *outl=0; |
3da0ca79 DSH |
497 | |
498 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) | |
499 | { | |
4ad2d3ac EK |
500 | i = ctx->cipher->do_cipher(ctx, out, NULL, 0); |
501 | if (i < 0) | |
3da0ca79 DSH |
502 | return 0; |
503 | else | |
4ad2d3ac | 504 | *outl = i; |
3da0ca79 DSH |
505 | return 1; |
506 | } | |
507 | ||
4ad2d3ac | 508 | b=ctx->cipher->block_size; |
f2e5ca84 DSH |
509 | if (ctx->flags & EVP_CIPH_NO_PADDING) |
510 | { | |
511 | if(ctx->buf_len) | |
512 | { | |
8afca8d9 | 513 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); |
f2e5ca84 DSH |
514 | return 0; |
515 | } | |
516 | *outl = 0; | |
517 | return 1; | |
518 | } | |
d02b48c6 RE |
519 | if (b > 1) |
520 | { | |
c148d709 | 521 | if (ctx->buf_len || !ctx->final_used) |
d02b48c6 | 522 | { |
8afca8d9 | 523 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH); |
d02b48c6 RE |
524 | return(0); |
525 | } | |
54a656ef | 526 | OPENSSL_assert(b <= sizeof ctx->final); |
03af8430 EK |
527 | |
528 | /* | |
529 | * The following assumes that the ciphertext has been authenticated. | |
530 | * Otherwise it provides a padding oracle. | |
531 | */ | |
4ad2d3ac EK |
532 | n=ctx->final[b-1]; |
533 | if (n == 0 || n > (int)b) | |
d02b48c6 | 534 | { |
4ad2d3ac EK |
535 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT); |
536 | return(0); | |
d02b48c6 | 537 | } |
4ad2d3ac EK |
538 | for (i=0; i<n; i++) |
539 | { | |
540 | if (ctx->final[--b] != n) | |
541 | { | |
542 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT); | |
543 | return(0); | |
544 | } | |
545 | } | |
546 | n=ctx->cipher->block_size-n; | |
547 | for (i=0; i<n; i++) | |
548 | out[i]=ctx->final[i]; | |
549 | *outl=n; | |
d02b48c6 RE |
550 | } |
551 | else | |
4ad2d3ac EK |
552 | *outl=0; |
553 | return(1); | |
d02b48c6 RE |
554 | } |
555 | ||
b40228a6 DSH |
556 | void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) |
557 | { | |
558 | if (ctx) | |
559 | { | |
560 | EVP_CIPHER_CTX_cleanup(ctx); | |
561 | OPENSSL_free(ctx); | |
562 | } | |
563 | } | |
564 | ||
be06a934 | 565 | int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) |
d02b48c6 | 566 | { |
544a2aea | 567 | if (c->cipher != NULL) |
be06a934 | 568 | { |
544a2aea DSH |
569 | if(c->cipher->cleanup && !c->cipher->cleanup(c)) |
570 | return 0; | |
43d60164 | 571 | /* Cleanse cipher context data */ |
544a2aea | 572 | if (c->cipher_data) |
43d60164 | 573 | OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); |
be06a934 | 574 | } |
544a2aea DSH |
575 | if (c->cipher_data) |
576 | OPENSSL_free(c->cipher_data); | |
0b13e9f0 | 577 | #ifndef OPENSSL_NO_ENGINE |
11a57c7b GT |
578 | if (c->engine) |
579 | /* The EVP_CIPHER we used belongs to an ENGINE, release the | |
580 | * functional reference we held for this reason. */ | |
581 | ENGINE_finish(c->engine); | |
0b13e9f0 | 582 | #endif |
d02b48c6 | 583 | memset(c,0,sizeof(EVP_CIPHER_CTX)); |
be06a934 | 584 | return 1; |
d02b48c6 RE |
585 | } |
586 | ||
6343829a | 587 | int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) |
7f060601 | 588 | { |
49528751 | 589 | if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) |
6343829a | 590 | return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); |
7f060601 DSH |
591 | if(c->key_len == keylen) return 1; |
592 | if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) | |
593 | { | |
594 | c->key_len = keylen; | |
595 | return 1; | |
596 | } | |
597 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH); | |
598 | return 0; | |
599 | } | |
49528751 | 600 | |
f2e5ca84 DSH |
601 | int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) |
602 | { | |
603 | if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING; | |
604 | else ctx->flags |= EVP_CIPH_NO_PADDING; | |
605 | return 1; | |
606 | } | |
607 | ||
49528751 DSH |
608 | int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) |
609 | { | |
610 | int ret; | |
611 | if(!ctx->cipher) { | |
612 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); | |
613 | return 0; | |
614 | } | |
615 | ||
616 | if(!ctx->cipher->ctrl) { | |
617 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); | |
618 | return 0; | |
619 | } | |
620 | ||
621 | ret = ctx->cipher->ctrl(ctx, type, arg, ptr); | |
622 | if(ret == -1) { | |
623 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); | |
624 | return 0; | |
625 | } | |
626 | return ret; | |
627 | } | |
216659eb DSH |
628 | |
629 | int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) | |
630 | { | |
631 | if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) | |
632 | return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); | |
633 | if (RAND_bytes(key, ctx->key_len) <= 0) | |
634 | return 0; | |
635 | return 1; | |
636 | } | |
637 | ||
c2bf7208 DSH |
638 | int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) |
639 | { | |
640 | if ((in == NULL) || (in->cipher == NULL)) | |
641 | { | |
642 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,EVP_R_INPUT_NOT_INITIALIZED); | |
643 | return 0; | |
644 | } | |
645 | #ifndef OPENSSL_NO_ENGINE | |
da395525 | 646 | /* Make sure it's safe to copy a cipher context using an ENGINE */ |
c2bf7208 DSH |
647 | if (in->engine && !ENGINE_init(in->engine)) |
648 | { | |
649 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_ENGINE_LIB); | |
650 | return 0; | |
651 | } | |
652 | #endif | |
653 | ||
654 | EVP_CIPHER_CTX_cleanup(out); | |
655 | memcpy(out,in,sizeof *out); | |
656 | ||
657 | if (in->cipher_data && in->cipher->ctx_size) | |
658 | { | |
659 | out->cipher_data=OPENSSL_malloc(in->cipher->ctx_size); | |
660 | if (!out->cipher_data) | |
661 | { | |
662 | EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_MALLOC_FAILURE); | |
663 | return 0; | |
664 | } | |
665 | memcpy(out->cipher_data,in->cipher_data,in->cipher->ctx_size); | |
666 | } | |
667 | ||
668 | if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) | |
669 | return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out); | |
670 | return 1; | |
671 | } |