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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
208 case EVP_CIPH_CBC_MODE:
209
210 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
211 (int)sizeof(ctx->iv));
212 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
213 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
214 break;
215
216 default:
217 return 0;
218 break;
219 }
220 }
221
222 if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
223 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
224 }
225 ctx->buf_len=0;
226 ctx->final_used=0;
227 ctx->block_mask=ctx->cipher->block_size-1;
228 return 1;
229 }
230
231int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
232 const unsigned char *in, int inl)
233 {
234 if (ctx->encrypt)
235 return EVP_EncryptUpdate(ctx,out,outl,in,inl);
236 else return EVP_DecryptUpdate(ctx,out,outl,in,inl);
237 }
238
239int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
240 {
241 if (ctx->encrypt)
242 return EVP_EncryptFinal_ex(ctx,out,outl);
243 else return EVP_DecryptFinal_ex(ctx,out,outl);
244 }
245
246int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
247 {
248 if (ctx->encrypt)
249 return EVP_EncryptFinal(ctx,out,outl);
250 else return EVP_DecryptFinal(ctx,out,outl);
251 }
252
253int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
254 const unsigned char *key, const unsigned char *iv)
255 {
256 return EVP_CipherInit(ctx, cipher, key, iv, 1);
257 }
258
259int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl,
260 const unsigned char *key, const unsigned char *iv)
261 {
262 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
263 }
264
265int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
266 const unsigned char *key, const unsigned char *iv)
267 {
268 return EVP_CipherInit(ctx, cipher, key, iv, 0);
269 }
270
271int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
272 const unsigned char *key, const unsigned char *iv)
273 {
274 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
275 }
276
277int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
278 const unsigned char *in, int inl)
279 {
280 int i,j,bl;
281
282 if (inl <= 0)
283 {
284 *outl = 0;
285 return inl == 0;
286 }
287
288 if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
289 {
290 if(ctx->cipher->do_cipher(ctx,out,in,inl))
291 {
292 *outl=inl;
293 return 1;
294 }
295 else
296 {
297 *outl=0;
298 return 0;
299 }
300 }
301 i=ctx->buf_len;
302 bl=ctx->cipher->block_size;
303 OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
304 if (i != 0)
305 {
306 if (i+inl < bl)
307 {
308 memcpy(&(ctx->buf[i]),in,inl);
309 ctx->buf_len+=inl;
310 *outl=0;
311 return 1;
312 }
313 else
314 {
315 j=bl-i;
316 memcpy(&(ctx->buf[i]),in,j);
317 if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
318 inl-=j;
319 in+=j;
320 out+=bl;
321 *outl=bl;
322 }
323 }
324 else
325 *outl = 0;
326 i=inl&(bl-1);
327 inl-=i;
328 if (inl > 0)
329 {
330 if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
331 *outl+=inl;
332 }
333
334 if (i != 0)
335 memcpy(ctx->buf,&(in[inl]),i);
336 ctx->buf_len=i;
337 return 1;
338 }
339
340int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
341 {
342 int ret;
343 ret = EVP_EncryptFinal_ex(ctx, out, outl);
344 return ret;
345 }
346
347int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
348 {
349 int n,ret;
350 unsigned int i, b, bl;
351
352 b=ctx->cipher->block_size;
353 OPENSSL_assert(b <= sizeof ctx->buf);
354 if (b == 1)
355 {
356 *outl=0;
357 return 1;
358 }
359 bl=ctx->buf_len;
360 if (ctx->flags & EVP_CIPH_NO_PADDING)
361 {
362 if(bl)
363 {
364 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
365 return 0;
366 }
367 *outl = 0;
368 return 1;
369 }
370
371 n=b-bl;
372 for (i=bl; i<b; i++)
373 ctx->buf[i]=n;
374 ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
375
376
377 if(ret)
378 *outl=b;
379
380 return ret;
381 }
382
383int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
384 const unsigned char *in, int inl)
385 {
386 int fix_len;
387 unsigned int b;
388
389 if (inl <= 0)
390 {
391 *outl = 0;
392 return inl == 0;
393 }
394
395 if (ctx->flags & EVP_CIPH_NO_PADDING)
396 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
397
398 b=ctx->cipher->block_size;
399 OPENSSL_assert(b <= sizeof ctx->final);
400
401 if(ctx->final_used)
402 {
403 memcpy(out,ctx->final,b);
404 out+=b;
405 fix_len = 1;
406 }
407 else
408 fix_len = 0;
409
410
411 if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
412 return 0;
413
414 /* if we have 'decrypted' a multiple of block size, make sure
415 * we have a copy of this last block */
416 if (b > 1 && !ctx->buf_len)
417 {
418 *outl-=b;
419 ctx->final_used=1;
420 memcpy(ctx->final,&out[*outl],b);
421 }
422 else
423 ctx->final_used = 0;
424
425 if (fix_len)
426 *outl += b;
427
428 return 1;
429 }
430
431int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
432 {
433 int ret;
434 ret = EVP_DecryptFinal_ex(ctx, out, outl);
435 return ret;
436 }
437
438int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
439 {
440 int i,n;
441 unsigned int b;
442
443 *outl=0;
444 b=ctx->cipher->block_size;
445 if (ctx->flags & EVP_CIPH_NO_PADDING)
446 {
447 if(ctx->buf_len)
448 {
449 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
450 return 0;
451 }
452 *outl = 0;
453 return 1;
454 }
455 if (b > 1)
456 {
457 if (ctx->buf_len || !ctx->final_used)
458 {
459 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
460 return(0);
461 }
462 OPENSSL_assert(b <= sizeof ctx->final);
463 n=ctx->final[b-1];
464 if (n == 0 || n > (int)b)
465 {
466 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
467 return(0);
468 }
469 for (i=0; i<n; i++)
470 {
471 if (ctx->final[--b] != n)
472 {
473 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
474 return(0);
475 }
476 }
477 n=ctx->cipher->block_size-n;
478 for (i=0; i<n; i++)
479 out[i]=ctx->final[i];
480 *outl=n;
481 }
482 else
483 *outl=0;
484 return(1);
485 }
486
487void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
488 {
489 if (ctx)
490 {
491 EVP_CIPHER_CTX_cleanup(ctx);
492 OPENSSL_free(ctx);
493 }
494 }
495
496int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
497 {
498 if (c->cipher != NULL)
499 {
500 if(c->cipher->cleanup && !c->cipher->cleanup(c))
501 return 0;
502 /* Cleanse cipher context data */
503 if (c->cipher_data)
504 OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
505 }
506 if (c->cipher_data)
507 OPENSSL_free(c->cipher_data);
508#ifndef OPENSSL_NO_ENGINE
509 if (c->engine)
510 /* The EVP_CIPHER we used belongs to an ENGINE, release the
511 * functional reference we held for this reason. */
512 ENGINE_finish(c->engine);
513#endif
514 memset(c,0,sizeof(EVP_CIPHER_CTX));
515 return 1;
516 }
517
518int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
519 {
520 if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
521 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
522 if(c->key_len == keylen) return 1;
523 if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
524 {
525 c->key_len = keylen;
526 return 1;
527 }
528 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
529 return 0;
530 }
531
532int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
533 {
534 if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
535 else ctx->flags |= EVP_CIPH_NO_PADDING;
536 return 1;
537 }
538
539int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
540{
541 int ret;
542 if(!ctx->cipher) {
543 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
544 return 0;
545 }
546
547 if(!ctx->cipher->ctrl) {
548 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
549 return 0;
550 }
551
552 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
553 if(ret == -1) {
554 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
555 return 0;
556 }
557 return ret;
558}
559
560int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
561 {
562 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
563 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
564 if (RAND_bytes(key, ctx->key_len) <= 0)
565 return 0;
566 return 1;
567 }
568
569int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
570 {
571 if ((in == NULL) || (in->cipher == NULL))
572 {
573 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,EVP_R_INPUT_NOT_INITIALIZED);
574 return 0;
575 }
576#ifndef OPENSSL_NO_ENGINE
577 /* Make sure it's safe to copy a cipher context using an ENGINE */
578 if (in->engine && !ENGINE_init(in->engine))
579 {
580 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_ENGINE_LIB);
581 return 0;
582 }
583#endif
584
585 EVP_CIPHER_CTX_cleanup(out);
586 memcpy(out,in,sizeof *out);
587
588 if (in->cipher_data && in->cipher->ctx_size)
589 {
590 out->cipher_data=OPENSSL_malloc(in->cipher->ctx_size);
591 if (!out->cipher_data)
592 {
593 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_MALLOC_FAILURE);
594 return 0;
595 }
596 memcpy(out->cipher_data,in->cipher_data,in->cipher->ctx_size);
597 }
598
599 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
600 return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out);
601 return 1;
602 }
603
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