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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> |
11a57c7b | 63 | #include <openssl/engine.h> |
57ae2e24 | 64 | #include "evp_locl.h" |
d02b48c6 | 65 | |
f31b1250 BL |
66 | #include <assert.h> |
67 | ||
e778802f | 68 | const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT; |
58964a49 | 69 | |
6b691a5c | 70 | void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx) |
58964a49 RE |
71 | { |
72 | memset(ctx,0,sizeof(EVP_CIPHER_CTX)); | |
73 | /* ctx->cipher=NULL; */ | |
74 | } | |
d02b48c6 | 75 | |
360370d9 | 76 | int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0e360199 | 77 | const unsigned char *key, const unsigned char *iv, int enc) |
d02b48c6 | 78 | { |
11a57c7b GT |
79 | return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc); |
80 | } | |
81 | int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl, | |
82 | const unsigned char *key, const unsigned char *iv, int enc) | |
83 | { | |
49528751 | 84 | if(enc && (enc != -1)) enc = 1; |
11a57c7b GT |
85 | /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts |
86 | * so this context may already have an ENGINE! Try to avoid releasing | |
87 | * the previous handle, re-querying for an ENGINE, and having a | |
88 | * reinitialisation, when it may all be unecessary. */ | |
89 | if (ctx->engine && ctx->cipher && (!cipher || | |
90 | (cipher && (cipher->nid == ctx->cipher->nid)))) | |
91 | goto skip_to_init; | |
dbad1690 BL |
92 | if (cipher) |
93 | { | |
11a57c7b GT |
94 | /* Ensure an ENGINE left lying around from last time is cleared |
95 | * (the previous check attempted to avoid this if the same | |
96 | * ENGINE and EVP_CIPHER could be used). */ | |
97 | if(ctx->engine) | |
98 | ENGINE_finish(ctx->engine); | |
99 | if(!impl) | |
100 | /* Ask if an ENGINE is reserved for this job */ | |
101 | impl = ENGINE_get_cipher_engine(cipher->nid); | |
102 | if(impl) | |
103 | { | |
104 | /* There's an ENGINE for this job ... (apparently) */ | |
105 | const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid); | |
106 | if(!c) | |
107 | { | |
108 | /* One positive side-effect of US's export | |
109 | * control history, is that we should at least | |
110 | * be able to avoid using US mispellings of | |
111 | * "initialisation"? */ | |
112 | EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR); | |
113 | return 0; | |
114 | } | |
115 | /* We'll use the ENGINE's private cipher definition */ | |
116 | cipher = c; | |
117 | /* Store the ENGINE functional reference so we know | |
118 | * 'cipher' came from an ENGINE and we need to release | |
119 | * it when done. */ | |
120 | ctx->engine = impl; | |
121 | } | |
122 | else | |
123 | ctx->engine = NULL; | |
360370d9 | 124 | ctx->cipher=cipher; |
dbad1690 | 125 | ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size); |
360370d9 | 126 | ctx->key_len = cipher->key_len; |
f2e5ca84 | 127 | ctx->flags = 0; |
11a57c7b GT |
128 | if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT) |
129 | { | |
130 | if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) | |
131 | { | |
49528751 DSH |
132 | EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR); |
133 | return 0; | |
11a57c7b | 134 | } |
49528751 DSH |
135 | } |
136 | } | |
11a57c7b GT |
137 | else if(!ctx->cipher) |
138 | { | |
360370d9 DSH |
139 | EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET); |
140 | return 0; | |
11a57c7b GT |
141 | } |
142 | skip_to_init: | |
f31b1250 BL |
143 | /* we assume block size is a power of 2 in *cryptUpdate */ |
144 | assert(ctx->cipher->block_size == 1 | |
145 | || ctx->cipher->block_size == 8 | |
146 | || ctx->cipher->block_size == 16); | |
147 | ||
360370d9 DSH |
148 | if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) { |
149 | switch(EVP_CIPHER_CTX_mode(ctx)) { | |
150 | ||
151 | case EVP_CIPH_STREAM_CIPHER: | |
152 | case EVP_CIPH_ECB_MODE: | |
153 | break; | |
154 | ||
155 | case EVP_CIPH_CFB_MODE: | |
156 | case EVP_CIPH_OFB_MODE: | |
157 | ||
158 | ctx->num = 0; | |
159 | ||
160 | case EVP_CIPH_CBC_MODE: | |
161 | ||
162 | if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
163 | memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); | |
164 | break; | |
165 | ||
166 | default: | |
167 | return 0; | |
168 | break; | |
169 | } | |
170 | } | |
171 | ||
172 | if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { | |
173 | if(!ctx->cipher->init(ctx,key,iv,enc)) return 0; | |
174 | } | |
49528751 | 175 | if(enc != -1) ctx->encrypt=enc; |
360370d9 | 176 | ctx->buf_len=0; |
c148d709 BL |
177 | ctx->final_used=0; |
178 | ctx->block_mask=ctx->cipher->block_size-1; | |
360370d9 | 179 | return 1; |
d02b48c6 RE |
180 | } |
181 | ||
be06a934 | 182 | int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0e360199 | 183 | const unsigned char *in, int inl) |
d02b48c6 RE |
184 | { |
185 | if (ctx->encrypt) | |
be06a934 DSH |
186 | return EVP_EncryptUpdate(ctx,out,outl,in,inl); |
187 | else return EVP_DecryptUpdate(ctx,out,outl,in,inl); | |
d02b48c6 RE |
188 | } |
189 | ||
6b691a5c | 190 | int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
d02b48c6 RE |
191 | { |
192 | if (ctx->encrypt) | |
be06a934 | 193 | return EVP_EncryptFinal(ctx,out,outl); |
11a57c7b | 194 | else return EVP_DecryptFinal(ctx,out,outl); |
d02b48c6 RE |
195 | } |
196 | ||
be06a934 | 197 | int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0e360199 | 198 | const unsigned char *key, const unsigned char *iv) |
d02b48c6 | 199 | { |
360370d9 | 200 | return EVP_CipherInit(ctx, cipher, key, iv, 1); |
d02b48c6 RE |
201 | } |
202 | ||
be06a934 | 203 | int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0e360199 | 204 | const unsigned char *key, const unsigned char *iv) |
d02b48c6 | 205 | { |
360370d9 | 206 | return EVP_CipherInit(ctx, cipher, key, iv, 0); |
d02b48c6 RE |
207 | } |
208 | ||
be06a934 | 209 | int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0e360199 | 210 | const unsigned char *in, int inl) |
d02b48c6 RE |
211 | { |
212 | int i,j,bl; | |
213 | ||
c148d709 | 214 | if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0) |
7b6055d1 BL |
215 | { |
216 | if(ctx->cipher->do_cipher(ctx,out,in,inl)) | |
217 | { | |
218 | *outl=inl; | |
219 | return 1; | |
220 | } | |
221 | else | |
222 | { | |
223 | *outl=0; | |
224 | return 0; | |
225 | } | |
226 | } | |
c148d709 BL |
227 | i=ctx->buf_len; |
228 | bl=ctx->cipher->block_size; | |
d02b48c6 RE |
229 | if (i != 0) |
230 | { | |
231 | if (i+inl < bl) | |
232 | { | |
233 | memcpy(&(ctx->buf[i]),in,inl); | |
234 | ctx->buf_len+=inl; | |
c148d709 | 235 | *outl=0; |
be06a934 | 236 | return 1; |
d02b48c6 RE |
237 | } |
238 | else | |
239 | { | |
240 | j=bl-i; | |
c148d709 | 241 | memcpy(&(ctx->buf[i]),in,j); |
be06a934 | 242 | if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0; |
d02b48c6 RE |
243 | inl-=j; |
244 | in+=j; | |
245 | out+=bl; | |
c148d709 | 246 | *outl=bl; |
d02b48c6 RE |
247 | } |
248 | } | |
dc706cd3 DSH |
249 | else |
250 | *outl = 0; | |
f31b1250 | 251 | i=inl&(bl-1); |
d02b48c6 RE |
252 | inl-=i; |
253 | if (inl > 0) | |
254 | { | |
be06a934 | 255 | if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0; |
d02b48c6 RE |
256 | *outl+=inl; |
257 | } | |
258 | ||
259 | if (i != 0) | |
260 | memcpy(ctx->buf,&(in[inl]),i); | |
261 | ctx->buf_len=i; | |
be06a934 | 262 | return 1; |
d02b48c6 RE |
263 | } |
264 | ||
be06a934 | 265 | int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
d02b48c6 | 266 | { |
f0446ca8 | 267 | int i,n,b,bl,ret; |
d02b48c6 RE |
268 | |
269 | b=ctx->cipher->block_size; | |
270 | if (b == 1) | |
271 | { | |
82b22305 | 272 | EVP_CIPHER_CTX_cleanup(ctx); |
d02b48c6 | 273 | *outl=0; |
be06a934 | 274 | return 1; |
d02b48c6 RE |
275 | } |
276 | bl=ctx->buf_len; | |
f2e5ca84 DSH |
277 | if (ctx->flags & EVP_CIPH_NO_PADDING) |
278 | { | |
f0446ca8 | 279 | EVP_CIPHER_CTX_cleanup(ctx); |
f2e5ca84 DSH |
280 | if(bl) |
281 | { | |
282 | EVPerr(EVP_F_EVP_ENCRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
283 | return 0; | |
284 | } | |
285 | *outl = 0; | |
286 | return 1; | |
287 | } | |
f0446ca8 | 288 | |
d02b48c6 RE |
289 | n=b-bl; |
290 | for (i=bl; i<b; i++) | |
291 | ctx->buf[i]=n; | |
f0446ca8 BL |
292 | ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b); |
293 | ||
294 | EVP_CIPHER_CTX_cleanup(ctx); | |
295 | ||
296 | if(ret) | |
297 | *outl=b; | |
298 | ||
299 | return ret; | |
d02b48c6 RE |
300 | } |
301 | ||
be06a934 | 302 | int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0e360199 | 303 | const unsigned char *in, int inl) |
d02b48c6 | 304 | { |
f329b8d7 | 305 | int b, fix_len; |
d02b48c6 | 306 | |
c148d709 BL |
307 | if (inl == 0) |
308 | { | |
309 | *outl=0; | |
310 | return 1; | |
311 | } | |
d02b48c6 | 312 | |
f2e5ca84 DSH |
313 | if (ctx->flags & EVP_CIPH_NO_PADDING) |
314 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
315 | ||
d02b48c6 | 316 | b=ctx->cipher->block_size; |
f329b8d7 | 317 | |
c148d709 | 318 | if(ctx->final_used) |
d02b48c6 | 319 | { |
c148d709 BL |
320 | memcpy(out,ctx->final,b); |
321 | out+=b; | |
f329b8d7 | 322 | fix_len = 1; |
d02b48c6 | 323 | } |
f329b8d7 DSH |
324 | else |
325 | fix_len = 0; | |
326 | ||
327 | ||
c148d709 BL |
328 | if(!EVP_EncryptUpdate(ctx,out,outl,in,inl)) |
329 | return 0; | |
d02b48c6 RE |
330 | |
331 | /* if we have 'decrypted' a multiple of block size, make sure | |
332 | * we have a copy of this last block */ | |
c148d709 | 333 | if (b > 1 && !ctx->buf_len) |
d02b48c6 | 334 | { |
f329b8d7 DSH |
335 | *outl-=b; |
336 | ctx->final_used=1; | |
c148d709 BL |
337 | memcpy(ctx->final,&out[*outl],b); |
338 | } | |
f329b8d7 DSH |
339 | else |
340 | ctx->final_used = 0; | |
341 | ||
342 | if (fix_len) | |
343 | *outl += b; | |
344 | ||
be06a934 | 345 | return 1; |
d02b48c6 RE |
346 | } |
347 | ||
6b691a5c | 348 | int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
d02b48c6 RE |
349 | { |
350 | int i,b; | |
351 | int n; | |
352 | ||
353 | *outl=0; | |
354 | b=ctx->cipher->block_size; | |
f2e5ca84 DSH |
355 | if (ctx->flags & EVP_CIPH_NO_PADDING) |
356 | { | |
82b22305 | 357 | EVP_CIPHER_CTX_cleanup(ctx); |
f2e5ca84 DSH |
358 | if(ctx->buf_len) |
359 | { | |
360 | EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
361 | return 0; | |
362 | } | |
363 | *outl = 0; | |
364 | return 1; | |
365 | } | |
d02b48c6 RE |
366 | if (b > 1) |
367 | { | |
c148d709 | 368 | if (ctx->buf_len || !ctx->final_used) |
d02b48c6 | 369 | { |
82b22305 | 370 | EVP_CIPHER_CTX_cleanup(ctx); |
d02b48c6 RE |
371 | EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH); |
372 | return(0); | |
373 | } | |
c148d709 | 374 | n=ctx->final[b-1]; |
d02b48c6 RE |
375 | if (n > b) |
376 | { | |
82b22305 | 377 | EVP_CIPHER_CTX_cleanup(ctx); |
d02b48c6 RE |
378 | EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT); |
379 | return(0); | |
380 | } | |
381 | for (i=0; i<n; i++) | |
382 | { | |
c148d709 | 383 | if (ctx->final[--b] != n) |
d02b48c6 | 384 | { |
82b22305 | 385 | EVP_CIPHER_CTX_cleanup(ctx); |
d02b48c6 RE |
386 | EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT); |
387 | return(0); | |
388 | } | |
389 | } | |
390 | n=ctx->cipher->block_size-n; | |
391 | for (i=0; i<n; i++) | |
c148d709 | 392 | out[i]=ctx->final[i]; |
d02b48c6 RE |
393 | *outl=n; |
394 | } | |
395 | else | |
396 | *outl=0; | |
82b22305 | 397 | EVP_CIPHER_CTX_cleanup(ctx); |
d02b48c6 RE |
398 | return(1); |
399 | } | |
400 | ||
be06a934 | 401 | int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) |
d02b48c6 RE |
402 | { |
403 | if ((c->cipher != NULL) && (c->cipher->cleanup != NULL)) | |
be06a934 DSH |
404 | { |
405 | if(!c->cipher->cleanup(c)) return 0; | |
406 | } | |
dbad1690 | 407 | OPENSSL_free(c->cipher_data); |
11a57c7b GT |
408 | if (c->engine) |
409 | /* The EVP_CIPHER we used belongs to an ENGINE, release the | |
410 | * functional reference we held for this reason. */ | |
411 | ENGINE_finish(c->engine); | |
d02b48c6 | 412 | memset(c,0,sizeof(EVP_CIPHER_CTX)); |
be06a934 | 413 | return 1; |
d02b48c6 RE |
414 | } |
415 | ||
7f060601 DSH |
416 | int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) |
417 | { | |
49528751 DSH |
418 | if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) |
419 | return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); | |
7f060601 DSH |
420 | if(c->key_len == keylen) return 1; |
421 | if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) | |
422 | { | |
423 | c->key_len = keylen; | |
424 | return 1; | |
425 | } | |
426 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH); | |
427 | return 0; | |
428 | } | |
49528751 | 429 | |
f2e5ca84 DSH |
430 | int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) |
431 | { | |
432 | if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING; | |
433 | else ctx->flags |= EVP_CIPH_NO_PADDING; | |
434 | return 1; | |
435 | } | |
436 | ||
49528751 DSH |
437 | int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) |
438 | { | |
439 | int ret; | |
440 | if(!ctx->cipher) { | |
441 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); | |
442 | return 0; | |
443 | } | |
444 | ||
445 | if(!ctx->cipher->ctrl) { | |
446 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); | |
447 | return 0; | |
448 | } | |
449 | ||
450 | ret = ctx->cipher->ctrl(ctx, type, arg, ptr); | |
451 | if(ret == -1) { | |
452 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); | |
453 | return 0; | |
454 | } | |
455 | return ret; | |
456 | } |