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