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1/* crypto/evp/bio_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 <errno.h>
61#include "cryptlib.h"
62#include "buffer.h"
63#include "evp.h"
64
65#ifndef NOPROTO
66static int enc_write(BIO *h,char *buf,int num);
67static int enc_read(BIO *h,char *buf,int size);
68/*static int enc_puts(BIO *h,char *str); */
69/*static int enc_gets(BIO *h,char *str,int size); */
70static long enc_ctrl(BIO *h,int cmd,long arg1,char *arg2);
71static int enc_new(BIO *h);
72static int enc_free(BIO *data);
73#else
74static int enc_write();
75static int enc_read();
76/*static int enc_puts(); */
77/*static int enc_gets(); */
78static long enc_ctrl();
79static int enc_new();
80static int enc_free();
81#endif
82
83#define ENC_BLOCK_SIZE (1024*4)
84
85typedef struct enc_struct
86 {
87 int buf_len;
88 int buf_off;
89 int cont; /* <= 0 when finished */
90 int finished;
91 int ok; /* bad decrypt */
92 EVP_CIPHER_CTX cipher;
93 char buf[ENC_BLOCK_SIZE+10];
94 } BIO_ENC_CTX;
95
96static BIO_METHOD methods_enc=
97 {
98 BIO_TYPE_CIPHER,"cipher",
99 enc_write,
100 enc_read,
101 NULL, /* enc_puts, */
102 NULL, /* enc_gets, */
103 enc_ctrl,
104 enc_new,
105 enc_free,
106 };
107
108BIO_METHOD *BIO_f_cipher()
109 {
110 return(&methods_enc);
111 }
112
113static int enc_new(bi)
114BIO *bi;
115 {
116 BIO_ENC_CTX *ctx;
117
118 ctx=(BIO_ENC_CTX *)Malloc(sizeof(BIO_ENC_CTX));
119 EVP_CIPHER_CTX_init(&ctx->cipher);
120 if (ctx == NULL) return(0);
121
122 ctx->buf_len=0;
123 ctx->buf_off=0;
124 ctx->cont=1;
125 ctx->finished=0;
126 ctx->ok=1;
127
128 bi->init=0;
129 bi->ptr=(char *)ctx;
130 bi->flags=0;
131 return(1);
132 }
133
134static int enc_free(a)
135BIO *a;
136 {
137 BIO_ENC_CTX *b;
138
139 if (a == NULL) return(0);
140 b=(BIO_ENC_CTX *)a->ptr;
141 EVP_CIPHER_CTX_cleanup(&(b->cipher));
142 memset(a->ptr,0,sizeof(BIO_ENC_CTX));
143 Free(a->ptr);
144 a->ptr=NULL;
145 a->init=0;
146 a->flags=0;
147 return(1);
148 }
149
150static int enc_read(b,out,outl)
151BIO *b;
152char *out;
153int outl;
154 {
155 int ret=0,i;
156 BIO_ENC_CTX *ctx;
157
158 if (out == NULL) return(0);
159 ctx=(BIO_ENC_CTX *)b->ptr;
160
161 if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
162
163 /* First check if there are bytes decoded/encoded */
164 if (ctx->buf_len > 0)
165 {
166 i=ctx->buf_len-ctx->buf_off;
167 if (i > outl) i=outl;
168 memcpy(out,&(ctx->buf[ctx->buf_off]),i);
169 ret=i;
170 out+=i;
171 outl-=i;
172 ctx->buf_off+=i;
173 if (ctx->buf_len == ctx->buf_off)
174 {
175 ctx->buf_len=0;
176 ctx->buf_off=0;
177 }
178 }
179
180 /* At this point, we have room of outl bytes and an empty
181 * buffer, so we should read in some more. */
182
183 while (outl > 0)
184 {
185 if (ctx->cont <= 0) break;
186
187 /* read in at offset 8, read the EVP_Cipher
188 * documentation about why */
189 i=BIO_read(b->next_bio,&(ctx->buf[8]),ENC_BLOCK_SIZE);
190
191 if (i <= 0)
192 {
193 /* Should be continue next time we are called? */
194 if (!BIO_should_retry(b->next_bio))
195 {
196 ctx->cont=i;
197 i=EVP_CipherFinal(&(ctx->cipher),
198 (unsigned char *)ctx->buf,
199 &(ctx->buf_len));
200 ctx->ok=i;
201 ctx->buf_off=0;
202 }
203 else
204 ret=(ret == 0)?i:ret;
205 break;
206 }
207 else
208 {
209 EVP_CipherUpdate(&(ctx->cipher),
210 (unsigned char *)ctx->buf,&ctx->buf_len,
211 (unsigned char *)&(ctx->buf[8]),i);
212 ctx->cont=1;
213 }
214
215 if (ctx->buf_len <= outl)
216 i=ctx->buf_len;
217 else
218 i=outl;
219
220 if (i <= 0) break;
221 memcpy(out,ctx->buf,i);
222 ret+=i;
223 ctx->buf_off=i;
224 outl-=i;
225 out+=i;
226 }
227
228 BIO_clear_retry_flags(b);
229 BIO_copy_next_retry(b);
230 return((ret == 0)?ctx->cont:ret);
231 }
232
233static int enc_write(b,in,inl)
234BIO *b;
235char *in;
236int inl;
237 {
238 int ret=0,n,i;
239 BIO_ENC_CTX *ctx;
240
241 ctx=(BIO_ENC_CTX *)b->ptr;
242 ret=inl;
243
244 BIO_clear_retry_flags(b);
245 n=ctx->buf_len-ctx->buf_off;
246 while (n > 0)
247 {
248 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
249 if (i <= 0)
250 {
251 BIO_copy_next_retry(b);
252 return(i);
253 }
254 ctx->buf_off+=i;
255 n-=i;
256 }
257 /* at this point all pending data has been written */
258
259 if ((in == NULL) || (inl <= 0)) return(0);
260
261 ctx->buf_off=0;
262 while (inl > 0)
263 {
264 n=(inl > ENC_BLOCK_SIZE)?ENC_BLOCK_SIZE:inl;
265 EVP_CipherUpdate(&(ctx->cipher),
266 (unsigned char *)ctx->buf,&ctx->buf_len,
267 (unsigned char *)in,n);
268 inl-=n;
269 in+=n;
270
271 ctx->buf_off=0;
272 n=ctx->buf_len;
273 while (n > 0)
274 {
275 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
276 if (i <= 0)
277 {
278 BIO_copy_next_retry(b);
279 return(i);
280 }
281 n-=i;
282 ctx->buf_off+=i;
283 }
284 ctx->buf_len=0;
285 ctx->buf_off=0;
286 }
287 BIO_copy_next_retry(b);
288 return(ret);
289 }
290
291static long enc_ctrl(b,cmd,num,ptr)
292BIO *b;
293int cmd;
294long num;
295char *ptr;
296 {
297 BIO *dbio;
298 BIO_ENC_CTX *ctx,*dctx;
299 long ret=1;
300 int i;
301
302 ctx=(BIO_ENC_CTX *)b->ptr;
303
304 switch (cmd)
305 {
306 case BIO_CTRL_RESET:
307 ctx->ok=1;
308 ctx->finished=0;
309 EVP_CipherInit(&(ctx->cipher),NULL,NULL,NULL,
310 ctx->cipher.encrypt);
311 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
312 break;
313 case BIO_CTRL_EOF: /* More to read */
314 if (ctx->cont <= 0)
315 ret=1;
316 else
317 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
318 break;
319 case BIO_CTRL_WPENDING:
320 ret=ctx->buf_len-ctx->buf_off;
321 if (ret <= 0)
322 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
323 break;
324 case BIO_CTRL_PENDING: /* More to read in buffer */
325 ret=ctx->buf_len-ctx->buf_off;
326 if (ret <= 0)
327 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
328 break;
329 case BIO_CTRL_FLUSH:
330 /* do a final write */
331again:
332 while (ctx->buf_len != ctx->buf_off)
333 {
334 i=enc_write(b,NULL,0);
335 if (i < 0)
336 {
337 ret=i;
338 break;
339 }
340 }
341
342 if (!ctx->finished)
343 {
344 ctx->finished=1;
345 ctx->buf_off=0;
346 ret=EVP_CipherFinal(&(ctx->cipher),
347 (unsigned char *)ctx->buf,
348 &(ctx->buf_len));
349 ctx->ok=(int)ret;
350 if (ret <= 0) break;
351
352 /* push out the bytes */
353 goto again;
354 }
355
356 /* Finally flush the underlying BIO */
357 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
358 break;
359 case BIO_C_GET_CIPHER_STATUS:
360 ret=(long)ctx->ok;
361 break;
362 case BIO_C_DO_STATE_MACHINE:
363 BIO_clear_retry_flags(b);
364 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
365 BIO_copy_next_retry(b);
366 break;
367
368 case BIO_CTRL_DUP:
369 dbio=(BIO *)ptr;
370 dctx=(BIO_ENC_CTX *)dbio->ptr;
371 memcpy(&(dctx->cipher),&(ctx->cipher),sizeof(ctx->cipher));
372 dbio->init=1;
373 break;
374 default:
375 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
376 break;
377 }
378 return(ret);
379 }
380
381/*
382void BIO_set_cipher_ctx(b,c)
383BIO *b;
384EVP_CIPHER_ctx *c;
385 {
386 if (b == NULL) return;
387
388 if ((b->callback != NULL) &&
389 (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
390 return;
391
392 b->init=1;
393 ctx=(BIO_ENC_CTX *)b->ptr;
394 memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX));
395
396 if (b->callback != NULL)
397 b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
398 }
399*/
400
401void BIO_set_cipher(b,c,k,i,e)
402BIO *b;
403EVP_CIPHER *c;
404unsigned char *k;
405unsigned char *i;
406int e;
407 {
408 BIO_ENC_CTX *ctx;
409
410 if (b == NULL) return;
411
412 if ((b->callback != NULL) &&
413 (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
414 return;
415
416 b->init=1;
417 ctx=(BIO_ENC_CTX *)b->ptr;
418 EVP_CipherInit(&(ctx->cipher),c,k,i,e);
419
420 if (b->callback != NULL)
421 b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
422 }
423
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