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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 | |
e778802f | 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 | |
581f1c84 | 77 | |
360370d9 | 78 | int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0e360199 | 79 | const unsigned char *key, const unsigned char *iv, int enc) |
d02b48c6 | 80 | { |
a3829cb7 DSH |
81 | if (cipher) |
82 | EVP_CIPHER_CTX_init(ctx); | |
11a57c7b GT |
83 | return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc); |
84 | } | |
581f1c84 | 85 | |
11a57c7b GT |
86 | int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl, |
87 | const unsigned char *key, const unsigned char *iv, int enc) | |
88 | { | |
3e268d27 DSH |
89 | if (enc == -1) |
90 | enc = ctx->encrypt; | |
91 | else | |
92 | { | |
93 | if (enc) | |
94 | enc = 1; | |
95 | ctx->encrypt = enc; | |
96 | } | |
0b13e9f0 | 97 | #ifndef OPENSSL_NO_ENGINE |
11a57c7b GT |
98 | /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts |
99 | * so this context may already have an ENGINE! Try to avoid releasing | |
100 | * the previous handle, re-querying for an ENGINE, and having a | |
101 | * reinitialisation, when it may all be unecessary. */ | |
102 | if (ctx->engine && ctx->cipher && (!cipher || | |
103 | (cipher && (cipher->nid == ctx->cipher->nid)))) | |
104 | goto skip_to_init; | |
0b13e9f0 | 105 | #endif |
dbad1690 BL |
106 | if (cipher) |
107 | { | |
544a2aea | 108 | /* Ensure a context left lying around from last time is cleared |
11a57c7b GT |
109 | * (the previous check attempted to avoid this if the same |
110 | * ENGINE and EVP_CIPHER could be used). */ | |
544a2aea DSH |
111 | EVP_CIPHER_CTX_cleanup(ctx); |
112 | ||
113 | /* Restore encrypt field: it is zeroed by cleanup */ | |
114 | ctx->encrypt = enc; | |
0b13e9f0 | 115 | #ifndef OPENSSL_NO_ENGINE |
bf6a9e66 DSH |
116 | if(impl) |
117 | { | |
118 | if (!ENGINE_init(impl)) | |
119 | { | |
8afca8d9 | 120 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); |
bf6a9e66 DSH |
121 | return 0; |
122 | } | |
123 | } | |
124 | else | |
11a57c7b GT |
125 | /* Ask if an ENGINE is reserved for this job */ |
126 | impl = ENGINE_get_cipher_engine(cipher->nid); | |
127 | if(impl) | |
128 | { | |
129 | /* There's an ENGINE for this job ... (apparently) */ | |
130 | const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid); | |
131 | if(!c) | |
132 | { | |
133 | /* One positive side-effect of US's export | |
134 | * control history, is that we should at least | |
135 | * be able to avoid using US mispellings of | |
136 | * "initialisation"? */ | |
8afca8d9 | 137 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); |
11a57c7b GT |
138 | return 0; |
139 | } | |
140 | /* We'll use the ENGINE's private cipher definition */ | |
141 | cipher = c; | |
142 | /* Store the ENGINE functional reference so we know | |
143 | * 'cipher' came from an ENGINE and we need to release | |
144 | * it when done. */ | |
145 | ctx->engine = impl; | |
146 | } | |
147 | else | |
148 | ctx->engine = NULL; | |
0b13e9f0 | 149 | #endif |
544a2aea | 150 | |
360370d9 | 151 | ctx->cipher=cipher; |
2fe9ab8e | 152 | if (ctx->cipher->ctx_size) |
1145e038 | 153 | { |
2fe9ab8e RL |
154 | ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size); |
155 | if (!ctx->cipher_data) | |
156 | { | |
8afca8d9 | 157 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); |
2fe9ab8e RL |
158 | return 0; |
159 | } | |
160 | } | |
161 | else | |
162 | { | |
163 | ctx->cipher_data = NULL; | |
1145e038 | 164 | } |
360370d9 | 165 | ctx->key_len = cipher->key_len; |
f2e5ca84 | 166 | ctx->flags = 0; |
11a57c7b GT |
167 | if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT) |
168 | { | |
169 | if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) | |
170 | { | |
8afca8d9 | 171 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); |
49528751 | 172 | return 0; |
11a57c7b | 173 | } |
49528751 DSH |
174 | } |
175 | } | |
11a57c7b GT |
176 | else if(!ctx->cipher) |
177 | { | |
8afca8d9 | 178 | EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); |
360370d9 | 179 | return 0; |
11a57c7b | 180 | } |
0b13e9f0 | 181 | #ifndef OPENSSL_NO_ENGINE |
11a57c7b | 182 | skip_to_init: |
0b13e9f0 | 183 | #endif |
f31b1250 | 184 | /* we assume block size is a power of 2 in *cryptUpdate */ |
54a656ef BL |
185 | OPENSSL_assert(ctx->cipher->block_size == 1 |
186 | || ctx->cipher->block_size == 8 | |
187 | || ctx->cipher->block_size == 16); | |
f31b1250 | 188 | |
360370d9 DSH |
189 | if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) { |
190 | switch(EVP_CIPHER_CTX_mode(ctx)) { | |
191 | ||
192 | case EVP_CIPH_STREAM_CIPHER: | |
193 | case EVP_CIPH_ECB_MODE: | |
194 | break; | |
195 | ||
196 | case EVP_CIPH_CFB_MODE: | |
197 | case EVP_CIPH_OFB_MODE: | |
198 | ||
199 | ctx->num = 0; | |
200 | ||
201 | case EVP_CIPH_CBC_MODE: | |
202 | ||
27545970 GT |
203 | OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= |
204 | (int)sizeof(ctx->iv)); | |
360370d9 DSH |
205 | if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); |
206 | memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); | |
207 | break; | |
208 | ||
209 | default: | |
210 | return 0; | |
211 | break; | |
212 | } | |
213 | } | |
214 | ||
215 | if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { | |
216 | if(!ctx->cipher->init(ctx,key,iv,enc)) return 0; | |
217 | } | |
360370d9 | 218 | ctx->buf_len=0; |
c148d709 BL |
219 | ctx->final_used=0; |
220 | ctx->block_mask=ctx->cipher->block_size-1; | |
360370d9 | 221 | return 1; |
d02b48c6 RE |
222 | } |
223 | ||
be06a934 | 224 | int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0e360199 | 225 | const unsigned char *in, int inl) |
d02b48c6 RE |
226 | { |
227 | if (ctx->encrypt) | |
be06a934 DSH |
228 | return EVP_EncryptUpdate(ctx,out,outl,in,inl); |
229 | else return EVP_DecryptUpdate(ctx,out,outl,in,inl); | |
d02b48c6 RE |
230 | } |
231 | ||
581f1c84 DSH |
232 | int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
233 | { | |
234 | if (ctx->encrypt) | |
235 | return EVP_EncryptFinal_ex(ctx,out,outl); | |
236 | else return EVP_DecryptFinal_ex(ctx,out,outl); | |
237 | } | |
238 | ||
6b691a5c | 239 | int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
d02b48c6 RE |
240 | { |
241 | if (ctx->encrypt) | |
be06a934 | 242 | return EVP_EncryptFinal(ctx,out,outl); |
11a57c7b | 243 | else return EVP_DecryptFinal(ctx,out,outl); |
d02b48c6 RE |
244 | } |
245 | ||
be06a934 | 246 | int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0e360199 | 247 | const unsigned char *key, const unsigned char *iv) |
d02b48c6 | 248 | { |
581f1c84 | 249 | return EVP_CipherInit(ctx, cipher, key, iv, 1); |
18eda732 GT |
250 | } |
251 | ||
252 | int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl, | |
253 | const unsigned char *key, const unsigned char *iv) | |
254 | { | |
255 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); | |
d02b48c6 RE |
256 | } |
257 | ||
be06a934 | 258 | int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0e360199 | 259 | const unsigned char *key, const unsigned char *iv) |
d02b48c6 | 260 | { |
59ae8c94 | 261 | return EVP_CipherInit(ctx, cipher, key, iv, 0); |
18eda732 GT |
262 | } |
263 | ||
264 | int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl, | |
265 | const unsigned char *key, const unsigned char *iv) | |
266 | { | |
267 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); | |
d02b48c6 RE |
268 | } |
269 | ||
be06a934 | 270 | int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0e360199 | 271 | const unsigned char *in, int inl) |
d02b48c6 RE |
272 | { |
273 | int i,j,bl; | |
274 | ||
54a656ef | 275 | OPENSSL_assert(inl > 0); |
c148d709 | 276 | if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0) |
7b6055d1 BL |
277 | { |
278 | if(ctx->cipher->do_cipher(ctx,out,in,inl)) | |
279 | { | |
280 | *outl=inl; | |
281 | return 1; | |
282 | } | |
283 | else | |
284 | { | |
285 | *outl=0; | |
286 | return 0; | |
287 | } | |
288 | } | |
c148d709 BL |
289 | i=ctx->buf_len; |
290 | bl=ctx->cipher->block_size; | |
27545970 | 291 | OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); |
d02b48c6 RE |
292 | if (i != 0) |
293 | { | |
294 | if (i+inl < bl) | |
295 | { | |
296 | memcpy(&(ctx->buf[i]),in,inl); | |
297 | ctx->buf_len+=inl; | |
c148d709 | 298 | *outl=0; |
be06a934 | 299 | return 1; |
d02b48c6 RE |
300 | } |
301 | else | |
302 | { | |
303 | j=bl-i; | |
c148d709 | 304 | memcpy(&(ctx->buf[i]),in,j); |
be06a934 | 305 | if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0; |
d02b48c6 RE |
306 | inl-=j; |
307 | in+=j; | |
308 | out+=bl; | |
c148d709 | 309 | *outl=bl; |
d02b48c6 RE |
310 | } |
311 | } | |
dc706cd3 DSH |
312 | else |
313 | *outl = 0; | |
f31b1250 | 314 | i=inl&(bl-1); |
d02b48c6 RE |
315 | inl-=i; |
316 | if (inl > 0) | |
317 | { | |
be06a934 | 318 | if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0; |
d02b48c6 RE |
319 | *outl+=inl; |
320 | } | |
321 | ||
322 | if (i != 0) | |
323 | memcpy(ctx->buf,&(in[inl]),i); | |
324 | ctx->buf_len=i; | |
be06a934 | 325 | return 1; |
d02b48c6 RE |
326 | } |
327 | ||
be06a934 | 328 | int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
581f1c84 DSH |
329 | { |
330 | int ret; | |
331 | ret = EVP_EncryptFinal_ex(ctx, out, outl); | |
581f1c84 DSH |
332 | return ret; |
333 | } | |
334 | ||
335 | int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
d02b48c6 | 336 | { |
27545970 GT |
337 | int n,ret; |
338 | unsigned int i, b, bl; | |
d02b48c6 RE |
339 | |
340 | b=ctx->cipher->block_size; | |
54a656ef | 341 | OPENSSL_assert(b <= sizeof ctx->buf); |
d02b48c6 RE |
342 | if (b == 1) |
343 | { | |
344 | *outl=0; | |
be06a934 | 345 | return 1; |
d02b48c6 RE |
346 | } |
347 | bl=ctx->buf_len; | |
f2e5ca84 DSH |
348 | if (ctx->flags & EVP_CIPH_NO_PADDING) |
349 | { | |
350 | if(bl) | |
351 | { | |
8afca8d9 | 352 | EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); |
f2e5ca84 DSH |
353 | return 0; |
354 | } | |
355 | *outl = 0; | |
356 | return 1; | |
357 | } | |
f0446ca8 | 358 | |
d02b48c6 RE |
359 | n=b-bl; |
360 | for (i=bl; i<b; i++) | |
361 | ctx->buf[i]=n; | |
f0446ca8 BL |
362 | ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b); |
363 | ||
f0446ca8 BL |
364 | |
365 | if(ret) | |
366 | *outl=b; | |
367 | ||
368 | return ret; | |
d02b48c6 RE |
369 | } |
370 | ||
be06a934 | 371 | int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0e360199 | 372 | const unsigned char *in, int inl) |
d02b48c6 | 373 | { |
27545970 GT |
374 | int fix_len; |
375 | unsigned int b; | |
d02b48c6 | 376 | |
c148d709 BL |
377 | if (inl == 0) |
378 | { | |
379 | *outl=0; | |
380 | return 1; | |
381 | } | |
d02b48c6 | 382 | |
f2e5ca84 DSH |
383 | if (ctx->flags & EVP_CIPH_NO_PADDING) |
384 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
385 | ||
d02b48c6 | 386 | b=ctx->cipher->block_size; |
54a656ef | 387 | OPENSSL_assert(b <= sizeof ctx->final); |
f329b8d7 | 388 | |
c148d709 | 389 | if(ctx->final_used) |
d02b48c6 | 390 | { |
c148d709 BL |
391 | memcpy(out,ctx->final,b); |
392 | out+=b; | |
f329b8d7 | 393 | fix_len = 1; |
d02b48c6 | 394 | } |
f329b8d7 DSH |
395 | else |
396 | fix_len = 0; | |
397 | ||
398 | ||
c148d709 BL |
399 | if(!EVP_EncryptUpdate(ctx,out,outl,in,inl)) |
400 | return 0; | |
d02b48c6 RE |
401 | |
402 | /* if we have 'decrypted' a multiple of block size, make sure | |
403 | * we have a copy of this last block */ | |
c148d709 | 404 | if (b > 1 && !ctx->buf_len) |
d02b48c6 | 405 | { |
f329b8d7 DSH |
406 | *outl-=b; |
407 | ctx->final_used=1; | |
c148d709 BL |
408 | memcpy(ctx->final,&out[*outl],b); |
409 | } | |
f329b8d7 DSH |
410 | else |
411 | ctx->final_used = 0; | |
412 | ||
413 | if (fix_len) | |
414 | *outl += b; | |
415 | ||
be06a934 | 416 | return 1; |
d02b48c6 RE |
417 | } |
418 | ||
6b691a5c | 419 | int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
581f1c84 DSH |
420 | { |
421 | int ret; | |
422 | ret = EVP_DecryptFinal_ex(ctx, out, outl); | |
581f1c84 DSH |
423 | return ret; |
424 | } | |
425 | ||
426 | int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
d02b48c6 | 427 | { |
27545970 GT |
428 | int i,n; |
429 | unsigned int b; | |
d02b48c6 RE |
430 | |
431 | *outl=0; | |
432 | b=ctx->cipher->block_size; | |
f2e5ca84 DSH |
433 | if (ctx->flags & EVP_CIPH_NO_PADDING) |
434 | { | |
435 | if(ctx->buf_len) | |
436 | { | |
8afca8d9 | 437 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); |
f2e5ca84 DSH |
438 | return 0; |
439 | } | |
440 | *outl = 0; | |
441 | return 1; | |
442 | } | |
d02b48c6 RE |
443 | if (b > 1) |
444 | { | |
c148d709 | 445 | if (ctx->buf_len || !ctx->final_used) |
d02b48c6 | 446 | { |
8afca8d9 | 447 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH); |
d02b48c6 RE |
448 | return(0); |
449 | } | |
54a656ef | 450 | OPENSSL_assert(b <= sizeof ctx->final); |
c148d709 | 451 | n=ctx->final[b-1]; |
27545970 | 452 | if (n > (int)b) |
d02b48c6 | 453 | { |
8afca8d9 | 454 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT); |
d02b48c6 RE |
455 | return(0); |
456 | } | |
457 | for (i=0; i<n; i++) | |
458 | { | |
c148d709 | 459 | if (ctx->final[--b] != n) |
d02b48c6 | 460 | { |
8afca8d9 | 461 | EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT); |
d02b48c6 RE |
462 | return(0); |
463 | } | |
464 | } | |
465 | n=ctx->cipher->block_size-n; | |
466 | for (i=0; i<n; i++) | |
c148d709 | 467 | out[i]=ctx->final[i]; |
d02b48c6 RE |
468 | *outl=n; |
469 | } | |
470 | else | |
471 | *outl=0; | |
472 | return(1); | |
473 | } | |
474 | ||
be06a934 | 475 | int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) |
d02b48c6 | 476 | { |
544a2aea | 477 | if (c->cipher != NULL) |
be06a934 | 478 | { |
544a2aea DSH |
479 | if(c->cipher->cleanup && !c->cipher->cleanup(c)) |
480 | return 0; | |
43d60164 | 481 | /* Cleanse cipher context data */ |
544a2aea | 482 | if (c->cipher_data) |
43d60164 | 483 | OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); |
be06a934 | 484 | } |
544a2aea DSH |
485 | if (c->cipher_data) |
486 | OPENSSL_free(c->cipher_data); | |
0b13e9f0 | 487 | #ifndef OPENSSL_NO_ENGINE |
11a57c7b GT |
488 | if (c->engine) |
489 | /* The EVP_CIPHER we used belongs to an ENGINE, release the | |
490 | * functional reference we held for this reason. */ | |
491 | ENGINE_finish(c->engine); | |
0b13e9f0 | 492 | #endif |
d02b48c6 | 493 | memset(c,0,sizeof(EVP_CIPHER_CTX)); |
be06a934 | 494 | return 1; |
d02b48c6 RE |
495 | } |
496 | ||
7f060601 DSH |
497 | int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) |
498 | { | |
49528751 DSH |
499 | if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) |
500 | return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); | |
7f060601 DSH |
501 | if(c->key_len == keylen) return 1; |
502 | if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) | |
503 | { | |
504 | c->key_len = keylen; | |
505 | return 1; | |
506 | } | |
507 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH); | |
508 | return 0; | |
509 | } | |
49528751 | 510 | |
f2e5ca84 DSH |
511 | int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) |
512 | { | |
513 | if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING; | |
514 | else ctx->flags |= EVP_CIPH_NO_PADDING; | |
515 | return 1; | |
516 | } | |
517 | ||
49528751 DSH |
518 | int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) |
519 | { | |
520 | int ret; | |
521 | if(!ctx->cipher) { | |
522 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); | |
523 | return 0; | |
524 | } | |
525 | ||
526 | if(!ctx->cipher->ctrl) { | |
527 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); | |
528 | return 0; | |
529 | } | |
530 | ||
531 | ret = ctx->cipher->ctrl(ctx, type, arg, ptr); | |
532 | if(ret == -1) { | |
533 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); | |
534 | return 0; | |
535 | } | |
536 | return ret; | |
537 | } | |
216659eb DSH |
538 | |
539 | int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) | |
540 | { | |
541 | if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) | |
542 | return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); | |
543 | if (RAND_bytes(key, ctx->key_len) <= 0) | |
544 | return 0; | |
545 | return 1; | |
546 | } | |
547 |