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diff --git a/src/lib/libcrypto/evp/evp_enc.c b/src/lib/libcrypto/evp/evp_enc.c
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1/* crypto/evp/evp_enc.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
69const char EVP_version[]="EVP" OPENSSL_VERSION_PTEXT;
70
71void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
72 {
73 memset(ctx,0,sizeof(EVP_CIPHER_CTX));
74 /* ctx->cipher=NULL; */
75 }
76
77EVP_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 }
84
85int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
86 const unsigned char *key, const unsigned char *iv, int enc)
87 {
88 if (cipher)
89 EVP_CIPHER_CTX_init(ctx);
90 return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc);
91 }
92
93int 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 {
96 if (enc == -1)
97 enc = ctx->encrypt;
98 else
99 {
100 if (enc)
101 enc = 1;
102 ctx->encrypt = enc;
103 }
104#ifndef OPENSSL_NO_ENGINE
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;
112#endif
113 if (cipher)
114 {
115 /* Ensure a context left lying around from last time is cleared
116 * (the previous check attempted to avoid this if the same
117 * ENGINE and EVP_CIPHER could be used). */
118 EVP_CIPHER_CTX_cleanup(ctx);
119
120 /* Restore encrypt field: it is zeroed by cleanup */
121 ctx->encrypt = enc;
122#ifndef OPENSSL_NO_ENGINE
123 if(impl)
124 {
125 if (!ENGINE_init(impl))
126 {
127 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
128 return 0;
129 }
130 }
131 else
132 /* Ask if an ENGINE is reserved for this job */
133 impl = ENGINE_get_cipher_engine(cipher->nid);
134 if(impl)
135 {
136 /* There's an ENGINE for this job ... (apparently) */
137 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
138 if(!c)
139 {
140 /* One positive side-effect of US's export
141 * control history, is that we should at least
142 * be able to avoid using US mispellings of
143 * "initialisation"? */
144 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
145 return 0;
146 }
147 /* We'll use the ENGINE's private cipher definition */
148 cipher = c;
149 /* Store the ENGINE functional reference so we know
150 * 'cipher' came from an ENGINE and we need to release
151 * it when done. */
152 ctx->engine = impl;
153 }
154 else
155 ctx->engine = NULL;
156#endif
157
158 ctx->cipher=cipher;
159 if (ctx->cipher->ctx_size)
160 {
161 ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
162 if (!ctx->cipher_data)
163 {
164 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
165 return 0;
166 }
167 }
168 else
169 {
170 ctx->cipher_data = NULL;
171 }
172 ctx->key_len = cipher->key_len;
173 ctx->flags = 0;
174 if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT)
175 {
176 if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))
177 {
178 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
179 return 0;
180 }
181 }
182 }
183 else if(!ctx->cipher)
184 {
185 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
186 return 0;
187 }
188#ifndef OPENSSL_NO_ENGINE
189skip_to_init:
190#endif
191 /* we assume block size is a power of 2 in *cryptUpdate */
192 OPENSSL_assert(ctx->cipher->block_size == 1
193 || ctx->cipher->block_size == 8
194 || ctx->cipher->block_size == 16);
195
196 if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
197 switch(EVP_CIPHER_CTX_mode(ctx)) {
198
199 case EVP_CIPH_STREAM_CIPHER:
200 case EVP_CIPH_ECB_MODE:
201 break;
202
203 case EVP_CIPH_CFB_MODE:
204 case EVP_CIPH_OFB_MODE:
205
206 ctx->num = 0;
207 /* fall-through */
208
209 case EVP_CIPH_CBC_MODE:
210
211 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
212 (int)sizeof(ctx->iv));
213 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
214 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
215 break;
216
217 default:
218 return 0;
219 break;
220 }
221 }
222
223 if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
224 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
225 }
226 ctx->buf_len=0;
227 ctx->final_used=0;
228 ctx->block_mask=ctx->cipher->block_size-1;
229 return 1;
230 }
231
232int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
233 const unsigned char *in, int inl)
234 {
235 if (ctx->encrypt)
236 return EVP_EncryptUpdate(ctx,out,outl,in,inl);
237 else return EVP_DecryptUpdate(ctx,out,outl,in,inl);
238 }
239
240int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
241 {
242 if (ctx->encrypt)
243 return EVP_EncryptFinal_ex(ctx,out,outl);
244 else return EVP_DecryptFinal_ex(ctx,out,outl);
245 }
246
247int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
248 {
249 if (ctx->encrypt)
250 return EVP_EncryptFinal(ctx,out,outl);
251 else return EVP_DecryptFinal(ctx,out,outl);
252 }
253
254int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
255 const unsigned char *key, const unsigned char *iv)
256 {
257 return EVP_CipherInit(ctx, cipher, key, iv, 1);
258 }
259
260int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl,
261 const unsigned char *key, const unsigned char *iv)
262 {
263 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
264 }
265
266int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
267 const unsigned char *key, const unsigned char *iv)
268 {
269 return EVP_CipherInit(ctx, cipher, key, iv, 0);
270 }
271
272int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
273 const unsigned char *key, const unsigned char *iv)
274 {
275 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
276 }
277
278int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
279 const unsigned char *in, int inl)
280 {
281 int i,j,bl;
282
283 if (inl <= 0)
284 {
285 *outl = 0;
286 return inl == 0;
287 }
288
289 if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
290 {
291 if(ctx->cipher->do_cipher(ctx,out,in,inl))
292 {
293 *outl=inl;
294 return 1;
295 }
296 else
297 {
298 *outl=0;
299 return 0;
300 }
301 }
302 i=ctx->buf_len;
303 bl=ctx->cipher->block_size;
304 OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
305 if (i != 0)
306 {
307 if (i+inl < bl)
308 {
309 memcpy(&(ctx->buf[i]),in,inl);
310 ctx->buf_len+=inl;
311 *outl=0;
312 return 1;
313 }
314 else
315 {
316 j=bl-i;
317 memcpy(&(ctx->buf[i]),in,j);
318 if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
319 inl-=j;
320 in+=j;
321 out+=bl;
322 *outl=bl;
323 }
324 }
325 else
326 *outl = 0;
327 i=inl&(bl-1);
328 inl-=i;
329 if (inl > 0)
330 {
331 if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
332 *outl+=inl;
333 }
334
335 if (i != 0)
336 memcpy(ctx->buf,&(in[inl]),i);
337 ctx->buf_len=i;
338 return 1;
339 }
340
341int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
342 {
343 int ret;
344 ret = EVP_EncryptFinal_ex(ctx, out, outl);
345 return ret;
346 }
347
348int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
349 {
350 int n,ret;
351 unsigned int i, b, bl;
352
353 b=ctx->cipher->block_size;
354 OPENSSL_assert(b <= sizeof ctx->buf);
355 if (b == 1)
356 {
357 *outl=0;
358 return 1;
359 }
360 bl=ctx->buf_len;
361 if (ctx->flags & EVP_CIPH_NO_PADDING)
362 {
363 if(bl)
364 {
365 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
366 return 0;
367 }
368 *outl = 0;
369 return 1;
370 }
371
372 n=b-bl;
373 for (i=bl; i<b; i++)
374 ctx->buf[i]=n;
375 ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
376
377
378 if(ret)
379 *outl=b;
380
381 return ret;
382 }
383
384int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
385 const unsigned char *in, int inl)
386 {
387 int fix_len;
388 unsigned int b;
389
390 if (inl <= 0)
391 {
392 *outl = 0;
393 return inl == 0;
394 }
395
396 if (ctx->flags & EVP_CIPH_NO_PADDING)
397 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
398
399 b=ctx->cipher->block_size;
400 OPENSSL_assert(b <= sizeof ctx->final);
401
402 if(ctx->final_used)
403 {
404 memcpy(out,ctx->final,b);
405 out+=b;
406 fix_len = 1;
407 }
408 else
409 fix_len = 0;
410
411
412 if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
413 return 0;
414
415 /* if we have 'decrypted' a multiple of block size, make sure
416 * we have a copy of this last block */
417 if (b > 1 && !ctx->buf_len)
418 {
419 *outl-=b;
420 ctx->final_used=1;
421 memcpy(ctx->final,&out[*outl],b);
422 }
423 else
424 ctx->final_used = 0;
425
426 if (fix_len)
427 *outl += b;
428
429 return 1;
430 }
431
432int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
433 {
434 int ret;
435 ret = EVP_DecryptFinal_ex(ctx, out, outl);
436 return ret;
437 }
438
439int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
440 {
441 int i,n;
442 unsigned int b;
443
444 *outl=0;
445 b=ctx->cipher->block_size;
446 if (ctx->flags & EVP_CIPH_NO_PADDING)
447 {
448 if(ctx->buf_len)
449 {
450 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
451 return 0;
452 }
453 *outl = 0;
454 return 1;
455 }
456 if (b > 1)
457 {
458 if (ctx->buf_len || !ctx->final_used)
459 {
460 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
461 return(0);
462 }
463 OPENSSL_assert(b <= sizeof ctx->final);
464 n=ctx->final[b-1];
465 if (n == 0 || n > (int)b)
466 {
467 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
468 return(0);
469 }
470 for (i=0; i<n; i++)
471 {
472 if (ctx->final[--b] != n)
473 {
474 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
475 return(0);
476 }
477 }
478 n=ctx->cipher->block_size-n;
479 for (i=0; i<n; i++)
480 out[i]=ctx->final[i];
481 *outl=n;
482 }
483 else
484 *outl=0;
485 return(1);
486 }
487
488void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
489 {
490 if (ctx)
491 {
492 EVP_CIPHER_CTX_cleanup(ctx);
493 OPENSSL_free(ctx);
494 }
495 }
496
497int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
498 {
499 if (c->cipher != NULL)
500 {
501 if(c->cipher->cleanup && !c->cipher->cleanup(c))
502 return 0;
503 /* Cleanse cipher context data */
504 if (c->cipher_data)
505 OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
506 }
507 if (c->cipher_data)
508 OPENSSL_free(c->cipher_data);
509#ifndef OPENSSL_NO_ENGINE
510 if (c->engine)
511 /* The EVP_CIPHER we used belongs to an ENGINE, release the
512 * functional reference we held for this reason. */
513 ENGINE_finish(c->engine);
514#endif
515 memset(c,0,sizeof(EVP_CIPHER_CTX));
516 return 1;
517 }
518
519int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
520 {
521 if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
522 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
523 if(c->key_len == keylen) return 1;
524 if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
525 {
526 c->key_len = keylen;
527 return 1;
528 }
529 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
530 return 0;
531 }
532
533int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
534 {
535 if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
536 else ctx->flags |= EVP_CIPH_NO_PADDING;
537 return 1;
538 }
539
540int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
541{
542 int ret;
543 if(!ctx->cipher) {
544 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
545 return 0;
546 }
547
548 if(!ctx->cipher->ctrl) {
549 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
550 return 0;
551 }
552
553 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
554 if(ret == -1) {
555 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
556 return 0;
557 }
558 return ret;
559}
560
561int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
562 {
563 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
564 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
565 if (RAND_bytes(key, ctx->key_len) <= 0)
566 return 0;
567 return 1;
568 }
569
570int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
571 {
572 if ((in == NULL) || (in->cipher == NULL))
573 {
574 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,EVP_R_INPUT_NOT_INITIALIZED);
575 return 0;
576 }
577#ifndef OPENSSL_NO_ENGINE
578 /* Make sure it's safe to copy a cipher context using an ENGINE */
579 if (in->engine && !ENGINE_init(in->engine))
580 {
581 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_ENGINE_LIB);
582 return 0;
583 }
584#endif
585
586 EVP_CIPHER_CTX_cleanup(out);
587 memcpy(out,in,sizeof *out);
588
589 if (in->cipher_data && in->cipher->ctx_size)
590 {
591 out->cipher_data=OPENSSL_malloc(in->cipher->ctx_size);
592 if (!out->cipher_data)
593 {
594 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_MALLOC_FAILURE);
595 return 0;
596 }
597 memcpy(out->cipher_data,in->cipher_data,in->cipher->ctx_size);
598 }
599
600 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
601 return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out);
602 return 1;
603 }
604
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