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d02b48c6 | 1 | /* crypto/evp/bio_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 <errno.h> | |
61 | #include "cryptlib.h" | |
ec577822 BM |
62 | #include <openssl/buffer.h> |
63 | #include <openssl/evp.h> | |
d02b48c6 | 64 | |
0e1c0612 UM |
65 | static int enc_write(BIO *h, const char *buf, int num); |
66 | static int enc_read(BIO *h, char *buf, int size); | |
67 | /*static int enc_puts(BIO *h, const char *str); */ | |
68 | /*static int enc_gets(BIO *h, char *str, int size); */ | |
69 | static long enc_ctrl(BIO *h, int cmd, long arg1, void *arg2); | |
d02b48c6 RE |
70 | static int enc_new(BIO *h); |
71 | static int enc_free(BIO *data); | |
13083215 | 72 | static long enc_callback_ctrl(BIO *h, int cmd, bio_info_cb *fps); |
d02b48c6 | 73 | #define ENC_BLOCK_SIZE (1024*4) |
a93b01be | 74 | #define BUF_OFFSET (EVP_MAX_BLOCK_LENGTH*2) |
d02b48c6 RE |
75 | |
76 | typedef struct enc_struct | |
77 | { | |
78 | int buf_len; | |
79 | int buf_off; | |
80 | int cont; /* <= 0 when finished */ | |
81 | int finished; | |
82 | int ok; /* bad decrypt */ | |
83 | EVP_CIPHER_CTX cipher; | |
1a095560 DSH |
84 | /* buf is larger than ENC_BLOCK_SIZE because EVP_DecryptUpdate |
85 | * can return up to a block more data than is presented to it | |
86 | */ | |
87 | char buf[ENC_BLOCK_SIZE+BUF_OFFSET+2]; | |
d02b48c6 RE |
88 | } BIO_ENC_CTX; |
89 | ||
90 | static BIO_METHOD methods_enc= | |
91 | { | |
92 | BIO_TYPE_CIPHER,"cipher", | |
93 | enc_write, | |
94 | enc_read, | |
95 | NULL, /* enc_puts, */ | |
96 | NULL, /* enc_gets, */ | |
97 | enc_ctrl, | |
98 | enc_new, | |
99 | enc_free, | |
d3442bc7 | 100 | enc_callback_ctrl, |
d02b48c6 RE |
101 | }; |
102 | ||
6b691a5c | 103 | BIO_METHOD *BIO_f_cipher(void) |
d02b48c6 RE |
104 | { |
105 | return(&methods_enc); | |
106 | } | |
107 | ||
6b691a5c | 108 | static int enc_new(BIO *bi) |
d02b48c6 RE |
109 | { |
110 | BIO_ENC_CTX *ctx; | |
111 | ||
26a3a48d | 112 | ctx=(BIO_ENC_CTX *)OPENSSL_malloc(sizeof(BIO_ENC_CTX)); |
d02b48c6 | 113 | if (ctx == NULL) return(0); |
9cdf87f1 | 114 | EVP_CIPHER_CTX_init(&ctx->cipher); |
d02b48c6 RE |
115 | |
116 | ctx->buf_len=0; | |
117 | ctx->buf_off=0; | |
118 | ctx->cont=1; | |
119 | ctx->finished=0; | |
120 | ctx->ok=1; | |
121 | ||
122 | bi->init=0; | |
123 | bi->ptr=(char *)ctx; | |
124 | bi->flags=0; | |
125 | return(1); | |
126 | } | |
127 | ||
6b691a5c | 128 | static int enc_free(BIO *a) |
d02b48c6 RE |
129 | { |
130 | BIO_ENC_CTX *b; | |
131 | ||
132 | if (a == NULL) return(0); | |
133 | b=(BIO_ENC_CTX *)a->ptr; | |
134 | EVP_CIPHER_CTX_cleanup(&(b->cipher)); | |
4579924b | 135 | OPENSSL_cleanse(a->ptr,sizeof(BIO_ENC_CTX)); |
26a3a48d | 136 | OPENSSL_free(a->ptr); |
d02b48c6 RE |
137 | a->ptr=NULL; |
138 | a->init=0; | |
139 | a->flags=0; | |
140 | return(1); | |
141 | } | |
142 | ||
6b691a5c | 143 | static int enc_read(BIO *b, char *out, int outl) |
d02b48c6 RE |
144 | { |
145 | int ret=0,i; | |
146 | BIO_ENC_CTX *ctx; | |
147 | ||
148 | if (out == NULL) return(0); | |
149 | ctx=(BIO_ENC_CTX *)b->ptr; | |
150 | ||
151 | if ((ctx == NULL) || (b->next_bio == NULL)) return(0); | |
152 | ||
153 | /* First check if there are bytes decoded/encoded */ | |
154 | if (ctx->buf_len > 0) | |
155 | { | |
156 | i=ctx->buf_len-ctx->buf_off; | |
157 | if (i > outl) i=outl; | |
158 | memcpy(out,&(ctx->buf[ctx->buf_off]),i); | |
159 | ret=i; | |
160 | out+=i; | |
161 | outl-=i; | |
162 | ctx->buf_off+=i; | |
163 | if (ctx->buf_len == ctx->buf_off) | |
164 | { | |
165 | ctx->buf_len=0; | |
166 | ctx->buf_off=0; | |
167 | } | |
168 | } | |
169 | ||
170 | /* At this point, we have room of outl bytes and an empty | |
171 | * buffer, so we should read in some more. */ | |
172 | ||
173 | while (outl > 0) | |
174 | { | |
175 | if (ctx->cont <= 0) break; | |
176 | ||
1a095560 | 177 | /* read in at IV offset, read the EVP_Cipher |
d02b48c6 | 178 | * documentation about why */ |
757e392d | 179 | i=BIO_read(b->next_bio,&(ctx->buf[BUF_OFFSET]),ENC_BLOCK_SIZE); |
d02b48c6 RE |
180 | |
181 | if (i <= 0) | |
182 | { | |
183 | /* Should be continue next time we are called? */ | |
184 | if (!BIO_should_retry(b->next_bio)) | |
185 | { | |
186 | ctx->cont=i; | |
581f1c84 | 187 | i=EVP_CipherFinal_ex(&(ctx->cipher), |
d02b48c6 RE |
188 | (unsigned char *)ctx->buf, |
189 | &(ctx->buf_len)); | |
190 | ctx->ok=i; | |
191 | ctx->buf_off=0; | |
192 | } | |
7b65c329 DSH |
193 | else |
194 | { | |
d02b48c6 | 195 | ret=(ret == 0)?i:ret; |
7b65c329 DSH |
196 | break; |
197 | } | |
d02b48c6 RE |
198 | } |
199 | else | |
200 | { | |
201 | EVP_CipherUpdate(&(ctx->cipher), | |
202 | (unsigned char *)ctx->buf,&ctx->buf_len, | |
757e392d | 203 | (unsigned char *)&(ctx->buf[BUF_OFFSET]),i); |
d02b48c6 | 204 | ctx->cont=1; |
7b65c329 DSH |
205 | /* Note: it is possible for EVP_CipherUpdate to |
206 | * decrypt zero bytes because this is or looks like | |
207 | * the final block: if this happens we should retry | |
208 | * and either read more data or decrypt the final | |
209 | * block | |
210 | */ | |
211 | if(ctx->buf_len == 0) continue; | |
d02b48c6 RE |
212 | } |
213 | ||
214 | if (ctx->buf_len <= outl) | |
215 | i=ctx->buf_len; | |
216 | else | |
217 | i=outl; | |
d02b48c6 RE |
218 | if (i <= 0) break; |
219 | memcpy(out,ctx->buf,i); | |
220 | ret+=i; | |
221 | ctx->buf_off=i; | |
222 | outl-=i; | |
223 | out+=i; | |
224 | } | |
225 | ||
226 | BIO_clear_retry_flags(b); | |
227 | BIO_copy_next_retry(b); | |
228 | return((ret == 0)?ctx->cont:ret); | |
229 | } | |
230 | ||
0e1c0612 | 231 | static int enc_write(BIO *b, const char *in, int inl) |
d02b48c6 RE |
232 | { |
233 | int ret=0,n,i; | |
234 | BIO_ENC_CTX *ctx; | |
235 | ||
236 | ctx=(BIO_ENC_CTX *)b->ptr; | |
237 | ret=inl; | |
238 | ||
239 | BIO_clear_retry_flags(b); | |
240 | n=ctx->buf_len-ctx->buf_off; | |
241 | while (n > 0) | |
242 | { | |
243 | i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n); | |
244 | if (i <= 0) | |
245 | { | |
246 | BIO_copy_next_retry(b); | |
247 | return(i); | |
248 | } | |
249 | ctx->buf_off+=i; | |
250 | n-=i; | |
251 | } | |
252 | /* at this point all pending data has been written */ | |
253 | ||
254 | if ((in == NULL) || (inl <= 0)) return(0); | |
255 | ||
256 | ctx->buf_off=0; | |
257 | while (inl > 0) | |
258 | { | |
259 | n=(inl > ENC_BLOCK_SIZE)?ENC_BLOCK_SIZE:inl; | |
260 | EVP_CipherUpdate(&(ctx->cipher), | |
261 | (unsigned char *)ctx->buf,&ctx->buf_len, | |
262 | (unsigned char *)in,n); | |
263 | inl-=n; | |
264 | in+=n; | |
265 | ||
266 | ctx->buf_off=0; | |
267 | n=ctx->buf_len; | |
268 | while (n > 0) | |
269 | { | |
270 | i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n); | |
271 | if (i <= 0) | |
272 | { | |
273 | BIO_copy_next_retry(b); | |
b8dc9693 | 274 | return (ret == inl) ? i : ret - inl; |
d02b48c6 RE |
275 | } |
276 | n-=i; | |
277 | ctx->buf_off+=i; | |
278 | } | |
279 | ctx->buf_len=0; | |
280 | ctx->buf_off=0; | |
281 | } | |
282 | BIO_copy_next_retry(b); | |
283 | return(ret); | |
284 | } | |
285 | ||
0e1c0612 | 286 | static long enc_ctrl(BIO *b, int cmd, long num, void *ptr) |
d02b48c6 RE |
287 | { |
288 | BIO *dbio; | |
289 | BIO_ENC_CTX *ctx,*dctx; | |
290 | long ret=1; | |
291 | int i; | |
dfeab068 | 292 | EVP_CIPHER_CTX **c_ctx; |
d02b48c6 RE |
293 | |
294 | ctx=(BIO_ENC_CTX *)b->ptr; | |
295 | ||
296 | switch (cmd) | |
297 | { | |
298 | case BIO_CTRL_RESET: | |
299 | ctx->ok=1; | |
300 | ctx->finished=0; | |
581f1c84 | 301 | EVP_CipherInit_ex(&(ctx->cipher),NULL,NULL,NULL,NULL, |
d02b48c6 RE |
302 | ctx->cipher.encrypt); |
303 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
304 | break; | |
305 | case BIO_CTRL_EOF: /* More to read */ | |
306 | if (ctx->cont <= 0) | |
307 | ret=1; | |
308 | else | |
309 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
310 | break; | |
311 | case BIO_CTRL_WPENDING: | |
312 | ret=ctx->buf_len-ctx->buf_off; | |
313 | if (ret <= 0) | |
314 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
315 | break; | |
316 | case BIO_CTRL_PENDING: /* More to read in buffer */ | |
317 | ret=ctx->buf_len-ctx->buf_off; | |
318 | if (ret <= 0) | |
319 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
320 | break; | |
321 | case BIO_CTRL_FLUSH: | |
322 | /* do a final write */ | |
323 | again: | |
324 | while (ctx->buf_len != ctx->buf_off) | |
325 | { | |
326 | i=enc_write(b,NULL,0); | |
327 | if (i < 0) | |
b8dc9693 | 328 | return i; |
d02b48c6 RE |
329 | } |
330 | ||
331 | if (!ctx->finished) | |
332 | { | |
333 | ctx->finished=1; | |
334 | ctx->buf_off=0; | |
581f1c84 | 335 | ret=EVP_CipherFinal_ex(&(ctx->cipher), |
d02b48c6 RE |
336 | (unsigned char *)ctx->buf, |
337 | &(ctx->buf_len)); | |
338 | ctx->ok=(int)ret; | |
339 | if (ret <= 0) break; | |
340 | ||
341 | /* push out the bytes */ | |
342 | goto again; | |
343 | } | |
344 | ||
345 | /* Finally flush the underlying BIO */ | |
346 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
347 | break; | |
348 | case BIO_C_GET_CIPHER_STATUS: | |
349 | ret=(long)ctx->ok; | |
350 | break; | |
351 | case BIO_C_DO_STATE_MACHINE: | |
352 | BIO_clear_retry_flags(b); | |
353 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
354 | BIO_copy_next_retry(b); | |
355 | break; | |
dfeab068 RE |
356 | case BIO_C_GET_CIPHER_CTX: |
357 | c_ctx=(EVP_CIPHER_CTX **)ptr; | |
358 | (*c_ctx)= &(ctx->cipher); | |
359 | b->init=1; | |
360 | break; | |
d02b48c6 RE |
361 | case BIO_CTRL_DUP: |
362 | dbio=(BIO *)ptr; | |
363 | dctx=(BIO_ENC_CTX *)dbio->ptr; | |
17004262 DSH |
364 | EVP_CIPHER_CTX_init(&dctx->cipher); |
365 | ret = EVP_CIPHER_CTX_copy(&dctx->cipher,&ctx->cipher); | |
366 | if (ret) | |
367 | dbio->init=1; | |
d02b48c6 RE |
368 | break; |
369 | default: | |
370 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
371 | break; | |
372 | } | |
373 | return(ret); | |
374 | } | |
375 | ||
13083215 | 376 | static long enc_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) |
d3442bc7 RL |
377 | { |
378 | long ret=1; | |
379 | ||
380 | if (b->next_bio == NULL) return(0); | |
381 | switch (cmd) | |
382 | { | |
383 | default: | |
384 | ret=BIO_callback_ctrl(b->next_bio,cmd,fp); | |
385 | break; | |
386 | } | |
387 | return(ret); | |
388 | } | |
389 | ||
6977c7e2 | 390 | /*- |
58964a49 RE |
391 | void BIO_set_cipher_ctx(b,c) |
392 | BIO *b; | |
393 | EVP_CIPHER_ctx *c; | |
394 | { | |
395 | if (b == NULL) return; | |
396 | ||
397 | if ((b->callback != NULL) && | |
398 | (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0)) | |
399 | return; | |
400 | ||
401 | b->init=1; | |
402 | ctx=(BIO_ENC_CTX *)b->ptr; | |
403 | memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX)); | |
404 | ||
405 | if (b->callback != NULL) | |
406 | b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L); | |
407 | } | |
408 | */ | |
409 | ||
875a644a RL |
410 | void BIO_set_cipher(BIO *b, const EVP_CIPHER *c, const unsigned char *k, |
411 | const unsigned char *i, int e) | |
d02b48c6 RE |
412 | { |
413 | BIO_ENC_CTX *ctx; | |
414 | ||
415 | if (b == NULL) return; | |
416 | ||
417 | if ((b->callback != NULL) && | |
e778802f | 418 | (b->callback(b,BIO_CB_CTRL,(const char *)c,BIO_CTRL_SET,e,0L) <= 0)) |
d02b48c6 RE |
419 | return; |
420 | ||
421 | b->init=1; | |
422 | ctx=(BIO_ENC_CTX *)b->ptr; | |
581f1c84 | 423 | EVP_CipherInit_ex(&(ctx->cipher),c,NULL, k,i,e); |
d02b48c6 RE |
424 | |
425 | if (b->callback != NULL) | |
e778802f | 426 | b->callback(b,BIO_CB_CTRL,(const char *)c,BIO_CTRL_SET,e,1L); |
d02b48c6 RE |
427 | } |
428 |