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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> |
57ae2e24 | 63 | #include "evp_locl.h" |
d02b48c6 | 64 | |
f31b1250 BL |
65 | #include <assert.h> |
66 | ||
e778802f | 67 | const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT; |
58964a49 | 68 | |
6b691a5c | 69 | void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx) |
58964a49 RE |
70 | { |
71 | memset(ctx,0,sizeof(EVP_CIPHER_CTX)); | |
72 | /* ctx->cipher=NULL; */ | |
73 | } | |
d02b48c6 | 74 | |
360370d9 | 75 | int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0e360199 | 76 | const unsigned char *key, const unsigned char *iv, int enc) |
d02b48c6 | 77 | { |
49528751 | 78 | if(enc && (enc != -1)) enc = 1; |
dbad1690 BL |
79 | if (cipher) |
80 | { | |
360370d9 | 81 | ctx->cipher=cipher; |
dbad1690 | 82 | ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size); |
360370d9 | 83 | ctx->key_len = cipher->key_len; |
f2e5ca84 | 84 | ctx->flags = 0; |
49528751 DSH |
85 | if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { |
86 | if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { | |
87 | EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR); | |
88 | return 0; | |
89 | } | |
90 | } | |
360370d9 DSH |
91 | } else if(!ctx->cipher) { |
92 | EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET); | |
93 | return 0; | |
94 | } | |
f31b1250 BL |
95 | |
96 | /* we assume block size is a power of 2 in *cryptUpdate */ | |
97 | assert(ctx->cipher->block_size == 1 | |
98 | || ctx->cipher->block_size == 8 | |
99 | || ctx->cipher->block_size == 16); | |
100 | ||
360370d9 DSH |
101 | if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) { |
102 | switch(EVP_CIPHER_CTX_mode(ctx)) { | |
103 | ||
104 | case EVP_CIPH_STREAM_CIPHER: | |
105 | case EVP_CIPH_ECB_MODE: | |
106 | break; | |
107 | ||
108 | case EVP_CIPH_CFB_MODE: | |
109 | case EVP_CIPH_OFB_MODE: | |
110 | ||
111 | ctx->num = 0; | |
112 | ||
113 | case EVP_CIPH_CBC_MODE: | |
114 | ||
115 | if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); | |
116 | memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); | |
117 | break; | |
118 | ||
119 | default: | |
120 | return 0; | |
121 | break; | |
122 | } | |
123 | } | |
124 | ||
125 | if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { | |
126 | if(!ctx->cipher->init(ctx,key,iv,enc)) return 0; | |
127 | } | |
49528751 | 128 | if(enc != -1) ctx->encrypt=enc; |
360370d9 | 129 | ctx->buf_len=0; |
c148d709 BL |
130 | ctx->final_used=0; |
131 | ctx->block_mask=ctx->cipher->block_size-1; | |
360370d9 | 132 | return 1; |
d02b48c6 RE |
133 | } |
134 | ||
be06a934 | 135 | int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0e360199 | 136 | const unsigned char *in, int inl) |
d02b48c6 RE |
137 | { |
138 | if (ctx->encrypt) | |
be06a934 DSH |
139 | return EVP_EncryptUpdate(ctx,out,outl,in,inl); |
140 | else return EVP_DecryptUpdate(ctx,out,outl,in,inl); | |
d02b48c6 RE |
141 | } |
142 | ||
6b691a5c | 143 | int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
d02b48c6 RE |
144 | { |
145 | if (ctx->encrypt) | |
be06a934 | 146 | return EVP_EncryptFinal(ctx,out,outl); |
d02b48c6 RE |
147 | else return(EVP_DecryptFinal(ctx,out,outl)); |
148 | } | |
149 | ||
be06a934 | 150 | int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0e360199 | 151 | const unsigned char *key, const unsigned char *iv) |
d02b48c6 | 152 | { |
360370d9 | 153 | return EVP_CipherInit(ctx, cipher, key, iv, 1); |
d02b48c6 RE |
154 | } |
155 | ||
be06a934 | 156 | int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
0e360199 | 157 | const unsigned char *key, const unsigned char *iv) |
d02b48c6 | 158 | { |
360370d9 | 159 | return EVP_CipherInit(ctx, cipher, key, iv, 0); |
d02b48c6 RE |
160 | } |
161 | ||
be06a934 | 162 | int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0e360199 | 163 | const unsigned char *in, int inl) |
d02b48c6 RE |
164 | { |
165 | int i,j,bl; | |
166 | ||
c148d709 | 167 | if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0) |
7b6055d1 BL |
168 | { |
169 | if(ctx->cipher->do_cipher(ctx,out,in,inl)) | |
170 | { | |
171 | *outl=inl; | |
172 | return 1; | |
173 | } | |
174 | else | |
175 | { | |
176 | *outl=0; | |
177 | return 0; | |
178 | } | |
179 | } | |
c148d709 BL |
180 | i=ctx->buf_len; |
181 | bl=ctx->cipher->block_size; | |
d02b48c6 RE |
182 | if (i != 0) |
183 | { | |
184 | if (i+inl < bl) | |
185 | { | |
186 | memcpy(&(ctx->buf[i]),in,inl); | |
187 | ctx->buf_len+=inl; | |
c148d709 | 188 | *outl=0; |
be06a934 | 189 | return 1; |
d02b48c6 RE |
190 | } |
191 | else | |
192 | { | |
193 | j=bl-i; | |
c148d709 | 194 | memcpy(&(ctx->buf[i]),in,j); |
be06a934 | 195 | if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0; |
d02b48c6 RE |
196 | inl-=j; |
197 | in+=j; | |
198 | out+=bl; | |
c148d709 | 199 | *outl=bl; |
d02b48c6 RE |
200 | } |
201 | } | |
dc706cd3 DSH |
202 | else |
203 | *outl = 0; | |
f31b1250 | 204 | i=inl&(bl-1); |
d02b48c6 RE |
205 | inl-=i; |
206 | if (inl > 0) | |
207 | { | |
be06a934 | 208 | if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0; |
d02b48c6 RE |
209 | *outl+=inl; |
210 | } | |
211 | ||
212 | if (i != 0) | |
213 | memcpy(ctx->buf,&(in[inl]),i); | |
214 | ctx->buf_len=i; | |
be06a934 | 215 | return 1; |
d02b48c6 RE |
216 | } |
217 | ||
be06a934 | 218 | int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
d02b48c6 | 219 | { |
f0446ca8 | 220 | int i,n,b,bl,ret; |
d02b48c6 RE |
221 | |
222 | b=ctx->cipher->block_size; | |
223 | if (b == 1) | |
224 | { | |
225 | *outl=0; | |
be06a934 | 226 | return 1; |
d02b48c6 RE |
227 | } |
228 | bl=ctx->buf_len; | |
f2e5ca84 DSH |
229 | if (ctx->flags & EVP_CIPH_NO_PADDING) |
230 | { | |
f0446ca8 | 231 | EVP_CIPHER_CTX_cleanup(ctx); |
f2e5ca84 DSH |
232 | if(bl) |
233 | { | |
234 | EVPerr(EVP_F_EVP_ENCRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
235 | return 0; | |
236 | } | |
237 | *outl = 0; | |
238 | return 1; | |
239 | } | |
f0446ca8 | 240 | |
d02b48c6 RE |
241 | n=b-bl; |
242 | for (i=bl; i<b; i++) | |
243 | ctx->buf[i]=n; | |
f0446ca8 BL |
244 | ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b); |
245 | ||
246 | EVP_CIPHER_CTX_cleanup(ctx); | |
247 | ||
248 | if(ret) | |
249 | *outl=b; | |
250 | ||
251 | return ret; | |
d02b48c6 RE |
252 | } |
253 | ||
be06a934 | 254 | int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
0e360199 | 255 | const unsigned char *in, int inl) |
d02b48c6 | 256 | { |
c148d709 | 257 | int b; |
d02b48c6 | 258 | |
c148d709 BL |
259 | if (inl == 0) |
260 | { | |
261 | *outl=0; | |
262 | return 1; | |
263 | } | |
d02b48c6 | 264 | |
f2e5ca84 DSH |
265 | if (ctx->flags & EVP_CIPH_NO_PADDING) |
266 | return EVP_EncryptUpdate(ctx, out, outl, in, inl); | |
267 | ||
d02b48c6 | 268 | b=ctx->cipher->block_size; |
c148d709 | 269 | if(ctx->final_used) |
d02b48c6 | 270 | { |
c148d709 BL |
271 | memcpy(out,ctx->final,b); |
272 | out+=b; | |
d02b48c6 | 273 | } |
c148d709 BL |
274 | |
275 | if(!EVP_EncryptUpdate(ctx,out,outl,in,inl)) | |
276 | return 0; | |
d02b48c6 RE |
277 | |
278 | /* if we have 'decrypted' a multiple of block size, make sure | |
279 | * we have a copy of this last block */ | |
c148d709 | 280 | if (b > 1 && !ctx->buf_len) |
d02b48c6 | 281 | { |
c148d709 | 282 | if(!ctx->final_used) |
d02b48c6 | 283 | { |
c148d709 BL |
284 | *outl-=b; |
285 | ctx->final_used=1; | |
d02b48c6 | 286 | } |
c148d709 BL |
287 | memcpy(ctx->final,&out[*outl],b); |
288 | } | |
289 | else if(ctx->final_used) | |
290 | { | |
291 | ctx->final_used=0; | |
292 | *outl+=b; | |
d02b48c6 | 293 | } |
be06a934 | 294 | return 1; |
d02b48c6 RE |
295 | } |
296 | ||
6b691a5c | 297 | int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
d02b48c6 RE |
298 | { |
299 | int i,b; | |
300 | int n; | |
301 | ||
302 | *outl=0; | |
303 | b=ctx->cipher->block_size; | |
f2e5ca84 DSH |
304 | if (ctx->flags & EVP_CIPH_NO_PADDING) |
305 | { | |
306 | if(ctx->buf_len) | |
307 | { | |
308 | EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); | |
309 | return 0; | |
310 | } | |
311 | *outl = 0; | |
312 | return 1; | |
313 | } | |
d02b48c6 RE |
314 | if (b > 1) |
315 | { | |
c148d709 | 316 | if (ctx->buf_len || !ctx->final_used) |
d02b48c6 RE |
317 | { |
318 | EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH); | |
319 | return(0); | |
320 | } | |
c148d709 | 321 | n=ctx->final[b-1]; |
d02b48c6 RE |
322 | if (n > b) |
323 | { | |
324 | EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT); | |
325 | return(0); | |
326 | } | |
327 | for (i=0; i<n; i++) | |
328 | { | |
c148d709 | 329 | if (ctx->final[--b] != n) |
d02b48c6 RE |
330 | { |
331 | EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT); | |
332 | return(0); | |
333 | } | |
334 | } | |
335 | n=ctx->cipher->block_size-n; | |
336 | for (i=0; i<n; i++) | |
c148d709 | 337 | out[i]=ctx->final[i]; |
d02b48c6 RE |
338 | *outl=n; |
339 | } | |
340 | else | |
341 | *outl=0; | |
342 | return(1); | |
343 | } | |
344 | ||
be06a934 | 345 | int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) |
d02b48c6 RE |
346 | { |
347 | if ((c->cipher != NULL) && (c->cipher->cleanup != NULL)) | |
be06a934 DSH |
348 | { |
349 | if(!c->cipher->cleanup(c)) return 0; | |
350 | } | |
dbad1690 | 351 | OPENSSL_free(c->cipher_data); |
d02b48c6 | 352 | memset(c,0,sizeof(EVP_CIPHER_CTX)); |
be06a934 | 353 | return 1; |
d02b48c6 RE |
354 | } |
355 | ||
7f060601 DSH |
356 | int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) |
357 | { | |
49528751 DSH |
358 | if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) |
359 | return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); | |
7f060601 DSH |
360 | if(c->key_len == keylen) return 1; |
361 | if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) | |
362 | { | |
363 | c->key_len = keylen; | |
364 | return 1; | |
365 | } | |
366 | EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH); | |
367 | return 0; | |
368 | } | |
49528751 | 369 | |
f2e5ca84 DSH |
370 | int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) |
371 | { | |
372 | if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING; | |
373 | else ctx->flags |= EVP_CIPH_NO_PADDING; | |
374 | return 1; | |
375 | } | |
376 | ||
49528751 DSH |
377 | int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) |
378 | { | |
379 | int ret; | |
380 | if(!ctx->cipher) { | |
381 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); | |
382 | return 0; | |
383 | } | |
384 | ||
385 | if(!ctx->cipher->ctrl) { | |
386 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); | |
387 | return 0; | |
388 | } | |
389 | ||
390 | ret = ctx->cipher->ctrl(ctx, type, arg, ptr); | |
391 | if(ret == -1) { | |
392 | EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); | |
393 | return 0; | |
394 | } | |
395 | return ret; | |
396 | } |