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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#ifndef OPENSSL_NO_ENGINE
64#include <openssl/engine.h>
65#endif
66#include "evp_locl.h"
67
68const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;
69
70void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
71 {
72 memset(ctx,0,sizeof(EVP_CIPHER_CTX));
73 /* ctx->cipher=NULL; */
74 }
75
76
77int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
78 const unsigned char *key, const unsigned char *iv, int enc)
79 {
80 if (cipher)
81 EVP_CIPHER_CTX_init(ctx);
82 return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc);
83 }
84
85#ifdef OPENSSL_FIPS
86
87/* The purpose of these is to trap programs that attempt to use non FIPS
88 * algorithms in FIPS mode and ignore the errors.
89 */
90
91int bad_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
92 const unsigned char *iv, int enc)
93 { FIPS_ERROR_IGNORED("Cipher init"); return 0;}
94
95int bad_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
96 const unsigned char *in, unsigned int inl)
97 { FIPS_ERROR_IGNORED("Cipher update"); return 0;}
98
99/* NB: no cleanup because it is allowed after failed init */
100
101int bad_set_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ)
102 { FIPS_ERROR_IGNORED("Cipher set_asn1"); return 0;}
103int bad_get_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ)
104 { FIPS_ERROR_IGNORED("Cipher get_asn1"); return 0;}
105int bad_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
106 { FIPS_ERROR_IGNORED("Cipher ctrl"); return 0;}
107
108static const EVP_CIPHER bad_cipher =
109 {
110 0,
111 0,
112 0,
113 0,
114 0,
115 bad_init,
116 bad_do_cipher,
117 NULL,
118 0,
119 bad_set_asn1,
120 bad_get_asn1,
121 bad_ctrl,
122 NULL
123 };
124
125#endif
126
127int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
128 const unsigned char *key, const unsigned char *iv, int enc)
129 {
130 if (enc == -1)
131 enc = ctx->encrypt;
132 else
133 {
134 if (enc)
135 enc = 1;
136 ctx->encrypt = enc;
137 }
138#ifndef OPENSSL_NO_ENGINE
139 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
140 * so this context may already have an ENGINE! Try to avoid releasing
141 * the previous handle, re-querying for an ENGINE, and having a
142 * reinitialisation, when it may all be unecessary. */
143 if (ctx->engine && ctx->cipher && (!cipher ||
144 (cipher && (cipher->nid == ctx->cipher->nid))))
145 goto skip_to_init;
146#endif
147 if (cipher)
148 {
149 /* Ensure a context left lying around from last time is cleared
150 * (the previous check attempted to avoid this if the same
151 * ENGINE and EVP_CIPHER could be used). */
152 EVP_CIPHER_CTX_cleanup(ctx);
153
154 /* Restore encrypt field: it is zeroed by cleanup */
155 ctx->encrypt = enc;
156#ifndef OPENSSL_NO_ENGINE
157 if(impl)
158 {
159 if (!ENGINE_init(impl))
160 {
161 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
162 return 0;
163 }
164 }
165 else
166 /* Ask if an ENGINE is reserved for this job */
167 impl = ENGINE_get_cipher_engine(cipher->nid);
168 if(impl)
169 {
170 /* There's an ENGINE for this job ... (apparently) */
171 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
172 if(!c)
173 {
174 /* One positive side-effect of US's export
175 * control history, is that we should at least
176 * be able to avoid using US mispellings of
177 * "initialisation"? */
178 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
179 return 0;
180 }
181 /* We'll use the ENGINE's private cipher definition */
182 cipher = c;
183 /* Store the ENGINE functional reference so we know
184 * 'cipher' came from an ENGINE and we need to release
185 * it when done. */
186 ctx->engine = impl;
187 }
188 else
189 ctx->engine = NULL;
190#endif
191 ctx->cipher=cipher;
192 if (ctx->cipher->ctx_size)
193 {
194 ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
195 if (!ctx->cipher_data)
196 {
197 EVPerr(EVP_F_EVP_CIPHERINIT, ERR_R_MALLOC_FAILURE);
198 return 0;
199 }
200 }
201 else
202 {
203 ctx->cipher_data = NULL;
204 }
205 ctx->key_len = cipher->key_len;
206 ctx->flags = 0;
207 if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT)
208 {
209 if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))
210 {
211 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
212 return 0;
213 }
214 }
215 }
216 else if(!ctx->cipher)
217 {
218 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET);
219 return 0;
220 }
221#ifndef OPENSSL_NO_ENGINE
222skip_to_init:
223#endif
224 /* we assume block size is a power of 2 in *cryptUpdate */
225 OPENSSL_assert(ctx->cipher->block_size == 1
226 || ctx->cipher->block_size == 8
227 || ctx->cipher->block_size == 16);
228
229 if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
230 switch(EVP_CIPHER_CTX_mode(ctx)) {
231
232 case EVP_CIPH_STREAM_CIPHER:
233 case EVP_CIPH_ECB_MODE:
234 break;
235
236 case EVP_CIPH_CFB_MODE:
237 case EVP_CIPH_OFB_MODE:
238
239 ctx->num = 0;
240
241 case EVP_CIPH_CBC_MODE:
242
243 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= sizeof ctx->iv);
244 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
245 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
246 break;
247
248 default:
249 return 0;
250 break;
251 }
252 }
253
254#ifdef OPENSSL_FIPS
255 /* After 'key' is set no further parameters changes are permissible.
256 * So only check for non FIPS enabling at this point.
257 */
258 if (key && FIPS_mode())
259 {
260 if (!(ctx->cipher->flags & EVP_CIPH_FLAG_FIPS)
261 & !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW))
262 {
263 EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_DISABLED_FOR_FIPS);
264 ERR_add_error_data(2, "cipher=",
265 EVP_CIPHER_name(ctx->cipher));
266 ctx->cipher = &bad_cipher;
267 return 0;
268 }
269 }
270#endif
271
272 if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
273 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
274 }
275 ctx->buf_len=0;
276 ctx->final_used=0;
277 ctx->block_mask=ctx->cipher->block_size-1;
278 return 1;
279 }
280
281int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
282 const unsigned char *in, int inl)
283 {
284 if (ctx->encrypt)
285 return EVP_EncryptUpdate(ctx,out,outl,in,inl);
286 else return EVP_DecryptUpdate(ctx,out,outl,in,inl);
287 }
288
289int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
290 {
291 if (ctx->encrypt)
292 return EVP_EncryptFinal_ex(ctx,out,outl);
293 else return EVP_DecryptFinal_ex(ctx,out,outl);
294 }
295
296int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
297 {
298 if (ctx->encrypt)
299 return EVP_EncryptFinal(ctx,out,outl);
300 else return EVP_DecryptFinal(ctx,out,outl);
301 }
302
303int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
304 const unsigned char *key, const unsigned char *iv)
305 {
306 return EVP_CipherInit(ctx, cipher, key, iv, 1);
307 }
308
309int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl,
310 const unsigned char *key, const unsigned char *iv)
311 {
312 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
313 }
314
315int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
316 const unsigned char *key, const unsigned char *iv)
317 {
318 return EVP_CipherInit(ctx, cipher, key, iv, 0);
319 }
320
321int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
322 const unsigned char *key, const unsigned char *iv)
323 {
324 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
325 }
326
327int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
328 const unsigned char *in, int inl)
329 {
330 int i,j,bl;
331
332 OPENSSL_assert(inl > 0);
333 if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
334 {
335 if(ctx->cipher->do_cipher(ctx,out,in,inl))
336 {
337 *outl=inl;
338 return 1;
339 }
340 else
341 {
342 *outl=0;
343 return 0;
344 }
345 }
346 i=ctx->buf_len;
347 bl=ctx->cipher->block_size;
348 OPENSSL_assert(bl <= sizeof ctx->buf);
349 if (i != 0)
350 {
351 if (i+inl < bl)
352 {
353 memcpy(&(ctx->buf[i]),in,inl);
354 ctx->buf_len+=inl;
355 *outl=0;
356 return 1;
357 }
358 else
359 {
360 j=bl-i;
361 memcpy(&(ctx->buf[i]),in,j);
362 if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
363 inl-=j;
364 in+=j;
365 out+=bl;
366 *outl=bl;
367 }
368 }
369 else
370 *outl = 0;
371 i=inl&(bl-1);
372 inl-=i;
373 if (inl > 0)
374 {
375 if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
376 *outl+=inl;
377 }
378
379 if (i != 0)
380 memcpy(ctx->buf,&(in[inl]),i);
381 ctx->buf_len=i;
382 return 1;
383 }
384
385int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
386 {
387 int ret;
388 ret = EVP_EncryptFinal_ex(ctx, out, outl);
389 return ret;
390 }
391
392int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
393 {
394 int i,n,b,bl,ret;
395
396 b=ctx->cipher->block_size;
397 OPENSSL_assert(b <= sizeof ctx->buf);
398 if (b == 1)
399 {
400 *outl=0;
401 return 1;
402 }
403 bl=ctx->buf_len;
404 if (ctx->flags & EVP_CIPH_NO_PADDING)
405 {
406 if(bl)
407 {
408 EVPerr(EVP_F_EVP_ENCRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
409 return 0;
410 }
411 *outl = 0;
412 return 1;
413 }
414
415 n=b-bl;
416 for (i=bl; i<b; i++)
417 ctx->buf[i]=n;
418 ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
419
420
421 if(ret)
422 *outl=b;
423
424 return ret;
425 }
426
427int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
428 const unsigned char *in, int inl)
429 {
430 int b, fix_len;
431
432 if (inl == 0)
433 {
434 *outl=0;
435 return 1;
436 }
437
438 if (ctx->flags & EVP_CIPH_NO_PADDING)
439 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
440
441 b=ctx->cipher->block_size;
442 OPENSSL_assert(b <= sizeof ctx->final);
443
444 if(ctx->final_used)
445 {
446 memcpy(out,ctx->final,b);
447 out+=b;
448 fix_len = 1;
449 }
450 else
451 fix_len = 0;
452
453
454 if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
455 return 0;
456
457 /* if we have 'decrypted' a multiple of block size, make sure
458 * we have a copy of this last block */
459 if (b > 1 && !ctx->buf_len)
460 {
461 *outl-=b;
462 ctx->final_used=1;
463 memcpy(ctx->final,&out[*outl],b);
464 }
465 else
466 ctx->final_used = 0;
467
468 if (fix_len)
469 *outl += b;
470
471 return 1;
472 }
473
474int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
475 {
476 int ret;
477 ret = EVP_DecryptFinal_ex(ctx, out, outl);
478 return ret;
479 }
480
481int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
482 {
483 int i,b;
484 int n;
485
486 *outl=0;
487 b=ctx->cipher->block_size;
488 if (ctx->flags & EVP_CIPH_NO_PADDING)
489 {
490 if(ctx->buf_len)
491 {
492 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
493 return 0;
494 }
495 *outl = 0;
496 return 1;
497 }
498 if (b > 1)
499 {
500 if (ctx->buf_len || !ctx->final_used)
501 {
502 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
503 return(0);
504 }
505 OPENSSL_assert(b <= sizeof ctx->final);
506 n=ctx->final[b-1];
507 if (n > b)
508 {
509 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
510 return(0);
511 }
512 for (i=0; i<n; i++)
513 {
514 if (ctx->final[--b] != n)
515 {
516 EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
517 return(0);
518 }
519 }
520 n=ctx->cipher->block_size-n;
521 for (i=0; i<n; i++)
522 out[i]=ctx->final[i];
523 *outl=n;
524 }
525 else
526 *outl=0;
527 return(1);
528 }
529
530int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
531 {
532 if (c->cipher != NULL)
533 {
534 if(c->cipher->cleanup && !c->cipher->cleanup(c))
535 return 0;
536 /* Cleanse cipher context data */
537 if (c->cipher_data)
538 OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
539 }
540 if (c->cipher_data)
541 OPENSSL_free(c->cipher_data);
542#ifndef OPENSSL_NO_ENGINE
543 if (c->engine)
544 /* The EVP_CIPHER we used belongs to an ENGINE, release the
545 * functional reference we held for this reason. */
546 ENGINE_finish(c->engine);
547#endif
548 memset(c,0,sizeof(EVP_CIPHER_CTX));
549 return 1;
550 }
551
552int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
553 {
554 if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
555 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
556 if(c->key_len == keylen) return 1;
557 if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
558 {
559 c->key_len = keylen;
560 return 1;
561 }
562 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
563 return 0;
564 }
565
566int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
567 {
568 if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
569 else ctx->flags |= EVP_CIPH_NO_PADDING;
570 return 1;
571 }
572
573int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
574{
575 int ret;
576 if(!ctx->cipher) {
577 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
578 return 0;
579 }
580
581 if(!ctx->cipher->ctrl) {
582 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
583 return 0;
584 }
585
586 ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
587 if(ret == -1) {
588 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
589 return 0;
590 }
591 return ret;
592}
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