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diff --git a/src/lib/libcrypto/pkcs7/bio_ber.c b/src/lib/libcrypto/pkcs7/bio_ber.c
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1/* crypto/evp/bio_ber.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 <openssl/buffer.h>
63#include <openssl/evp.h>
64
65static int ber_write(BIO *h,char *buf,int num);
66static int ber_read(BIO *h,char *buf,int size);
67/*static int ber_puts(BIO *h,char *str); */
68/*static int ber_gets(BIO *h,char *str,int size); */
69static long ber_ctrl(BIO *h,int cmd,long arg1,char *arg2);
70static int ber_new(BIO *h);
71static int ber_free(BIO *data);
72#define BER_BUF_SIZE (32)
73
74/* This is used to hold the state of the BER objects being read. */
75typedef struct ber_struct
76 {
77 int tag;
78 int class;
79 long length;
80 int inf;
81 int num_left;
82 int depth;
83 } BER_CTX;
84
85typedef struct bio_ber_struct
86 {
87 int tag;
88 int class;
89 long length;
90 int inf;
91
92 /* most of the following are used when doing non-blocking IO */
93 /* reading */
94 long num_left; /* number of bytes still to read/write in block */
95 int depth; /* used with idefinite encoding. */
96 int finished; /* No more read data */
97
98 /* writting */
99 char *w_addr;
100 int w_offset;
101 int w_left;
102
103 int buf_len;
104 int buf_off;
105 unsigned char buf[BER_BUF_SIZE];
106 } BIO_BER_CTX;
107
108static BIO_METHOD methods_ber=
109 {
110 BIO_TYPE_CIPHER,"cipher",
111 ber_write,
112 ber_read,
113 NULL, /* ber_puts, */
114 NULL, /* ber_gets, */
115 ber_ctrl,
116 ber_new,
117 ber_free,
118 };
119
120BIO_METHOD *BIO_f_ber(void)
121 {
122 return(&methods_ber);
123 }
124
125static int ber_new(BIO *bi)
126 {
127 BIO_BER_CTX *ctx;
128
129 ctx=(BIO_BER_CTX *)Malloc(sizeof(BIO_BER_CTX));
130 if (ctx == NULL) return(0);
131
132 memset((char *)ctx,0,sizeof(BIO_BER_CTX));
133
134 bi->init=0;
135 bi->ptr=(char *)ctx;
136 bi->flags=0;
137 return(1);
138 }
139
140static int ber_free(BIO *a)
141 {
142 BIO_BER_CTX *b;
143
144 if (a == NULL) return(0);
145 b=(BIO_BER_CTX *)a->ptr;
146 memset(a->ptr,0,sizeof(BIO_BER_CTX));
147 Free(a->ptr);
148 a->ptr=NULL;
149 a->init=0;
150 a->flags=0;
151 return(1);
152 }
153
154int bio_ber_get_header(BIO *bio, BIO_BER_CTX *ctx)
155 {
156 char buf[64];
157 int i,j,n;
158 int ret;
159 unsigned char *p;
160 unsigned long length
161 int tag;
162 int class;
163 long max;
164
165 BIO_clear_retry_flags(b);
166
167 /* Pack the buffer down if there is a hole at the front */
168 if (ctx->buf_off != 0)
169 {
170 p=ctx->buf;
171 j=ctx->buf_off;
172 n=ctx->buf_len-j;
173 for (i=0; i<n; i++)
174 {
175 p[0]=p[j];
176 p++;
177 }
178 ctx->buf_len-j;
179 ctx->buf_off=0;
180 }
181
182 /* If there is more room, read some more data */
183 i=BER_BUF_SIZE-ctx->buf_len;
184 if (i)
185 {
186 i=BIO_read(bio->next_bio,&(ctx->buf[ctx->buf_len]),i);
187 if (i <= 0)
188 {
189 BIO_copy_next_retry(b);
190 return(i);
191 }
192 else
193 ctx->buf_len+=i;
194 }
195
196 max=ctx->buf_len;
197 p=ctx->buf;
198 ret=ASN1_get_object(&p,&length,&tag,&class,max);
199
200 if (ret & 0x80)
201 {
202 if ((ctx->buf_len < BER_BUF_SIZE) &&
203 (ERR_GET_REASON(ERR_peek_error()) == ASN1_R_TOO_LONG))
204 {
205 ERR_get_error(); /* clear the error */
206 BIO_set_retry_read(b);
207 }
208 return(-1);
209 }
210
211 /* We have no error, we have a header, so make use of it */
212
213 if ((ctx->tag >= 0) && (ctx->tag != tag))
214 {
215 BIOerr(BIO_F_BIO_BER_GET_HEADER,BIO_R_TAG_MISMATCH);
216 sprintf(buf,"tag=%d, got %d",ctx->tag,tag);
217 ERR_add_error_data(1,buf);
218 return(-1);
219 }
220 if (ret & 0x01)
221 if (ret & V_ASN1_CONSTRUCTED)
222 }
223
224static int ber_read(BIO *b, char *out, int outl)
225 {
226 int ret=0,i,n;
227 BIO_BER_CTX *ctx;
228
229 BIO_clear_retry_flags(b);
230
231 if (out == NULL) return(0);
232 ctx=(BIO_BER_CTX *)b->ptr;
233
234 if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
235
236 if (ctx->finished) return(0);
237
238again:
239 /* First see if we are half way through reading a block */
240 if (ctx->num_left > 0)
241 {
242 if (ctx->num_left < outl)
243 n=ctx->num_left;
244 else
245 n=outl;
246 i=BIO_read(b->next_bio,out,n);
247 if (i <= 0)
248 {
249 BIO_copy_next_retry(b);
250 return(i);
251 }
252 ctx->num_left-=i;
253 outl-=i;
254 ret+=i;
255 if (ctx->num_left <= 0)
256 {
257 ctx->depth--;
258 if (ctx->depth <= 0)
259 ctx->finished=1;
260 }
261 if (outl <= 0)
262 return(ret);
263 else
264 goto again;
265 }
266 else /* we need to read another BER header */
267 {
268 }
269 }
270
271static int ber_write(BIO *b, char *in, int inl)
272 {
273 int ret=0,n,i;
274 BIO_ENC_CTX *ctx;
275
276 ctx=(BIO_ENC_CTX *)b->ptr;
277 ret=inl;
278
279 BIO_clear_retry_flags(b);
280 n=ctx->buf_len-ctx->buf_off;
281 while (n > 0)
282 {
283 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
284 if (i <= 0)
285 {
286 BIO_copy_next_retry(b);
287 return(i);
288 }
289 ctx->buf_off+=i;
290 n-=i;
291 }
292 /* at this point all pending data has been written */
293
294 if ((in == NULL) || (inl <= 0)) return(0);
295
296 ctx->buf_off=0;
297 while (inl > 0)
298 {
299 n=(inl > ENC_BLOCK_SIZE)?ENC_BLOCK_SIZE:inl;
300 EVP_CipherUpdate(&(ctx->cipher),
301 (unsigned char *)ctx->buf,&ctx->buf_len,
302 (unsigned char *)in,n);
303 inl-=n;
304 in+=n;
305
306 ctx->buf_off=0;
307 n=ctx->buf_len;
308 while (n > 0)
309 {
310 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
311 if (i <= 0)
312 {
313 BIO_copy_next_retry(b);
314 return(i);
315 }
316 n-=i;
317 ctx->buf_off+=i;
318 }
319 ctx->buf_len=0;
320 ctx->buf_off=0;
321 }
322 BIO_copy_next_retry(b);
323 return(ret);
324 }
325
326static long ber_ctrl(BIO *b, int cmd, long num, char *ptr)
327 {
328 BIO *dbio;
329 BIO_ENC_CTX *ctx,*dctx;
330 long ret=1;
331 int i;
332
333 ctx=(BIO_ENC_CTX *)b->ptr;
334
335 switch (cmd)
336 {
337 case BIO_CTRL_RESET:
338 ctx->ok=1;
339 ctx->finished=0;
340 EVP_CipherInit(&(ctx->cipher),NULL,NULL,NULL,
341 ctx->cipher.berrypt);
342 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
343 break;
344 case BIO_CTRL_EOF: /* More to read */
345 if (ctx->cont <= 0)
346 ret=1;
347 else
348 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
349 break;
350 case BIO_CTRL_WPENDING:
351 ret=ctx->buf_len-ctx->buf_off;
352 if (ret <= 0)
353 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
354 break;
355 case BIO_CTRL_PENDING: /* More to read in buffer */
356 ret=ctx->buf_len-ctx->buf_off;
357 if (ret <= 0)
358 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
359 break;
360 case BIO_CTRL_FLUSH:
361 /* do a final write */
362again:
363 while (ctx->buf_len != ctx->buf_off)
364 {
365 i=ber_write(b,NULL,0);
366 if (i < 0)
367 {
368 ret=i;
369 break;
370 }
371 }
372
373 if (!ctx->finished)
374 {
375 ctx->finished=1;
376 ctx->buf_off=0;
377 ret=EVP_CipherFinal(&(ctx->cipher),
378 (unsigned char *)ctx->buf,
379 &(ctx->buf_len));
380 ctx->ok=(int)ret;
381 if (ret <= 0) break;
382
383 /* push out the bytes */
384 goto again;
385 }
386
387 /* Finally flush the underlying BIO */
388 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
389 break;
390 case BIO_C_GET_CIPHER_STATUS:
391 ret=(long)ctx->ok;
392 break;
393 case BIO_C_DO_STATE_MACHINE:
394 BIO_clear_retry_flags(b);
395 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
396 BIO_copy_next_retry(b);
397 break;
398
399 case BIO_CTRL_DUP:
400 dbio=(BIO *)ptr;
401 dctx=(BIO_ENC_CTX *)dbio->ptr;
402 memcpy(&(dctx->cipher),&(ctx->cipher),sizeof(ctx->cipher));
403 dbio->init=1;
404 break;
405 default:
406 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
407 break;
408 }
409 return(ret);
410 }
411
412/*
413void BIO_set_cipher_ctx(b,c)
414BIO *b;
415EVP_CIPHER_ctx *c;
416 {
417 if (b == NULL) return;
418
419 if ((b->callback != NULL) &&
420 (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
421 return;
422
423 b->init=1;
424 ctx=(BIO_ENC_CTX *)b->ptr;
425 memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX));
426
427 if (b->callback != NULL)
428 b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
429 }
430*/
431
432void BIO_set_cipher(BIO *b, EVP_CIPHER *c, unsigned char *k, unsigned char *i,
433 int e)
434 {
435 BIO_ENC_CTX *ctx;
436
437 if (b == NULL) return;
438
439 if ((b->callback != NULL) &&
440 (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
441 return;
442
443 b->init=1;
444 ctx=(BIO_ENC_CTX *)b->ptr;
445 EVP_CipherInit(&(ctx->cipher),c,k,i,e);
446
447 if (b->callback != NULL)
448 b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
449 }
450
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