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dfeab068 RE |
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" | |
ec577822 BM |
62 | #include <openssl/buffer.h> |
63 | #include <openssl/evp.h> | |
dfeab068 RE |
64 | |
65 | #ifndef NOPROTO | |
66 | static int ber_write(BIO *h,char *buf,int num); | |
67 | static int ber_read(BIO *h,char *buf,int size); | |
68 | /*static int ber_puts(BIO *h,char *str); */ | |
69 | /*static int ber_gets(BIO *h,char *str,int size); */ | |
70 | static long ber_ctrl(BIO *h,int cmd,long arg1,char *arg2); | |
71 | static int ber_new(BIO *h); | |
72 | static int ber_free(BIO *data); | |
73 | #else | |
74 | static int ber_write(); | |
75 | static int ber_read(); | |
76 | /*static int ber_puts(); */ | |
77 | /*static int ber_gets(); */ | |
78 | static long ber_ctrl(); | |
79 | static int ber_new(); | |
80 | static int ber_free(); | |
81 | #endif | |
82 | ||
83 | #define BER_BUF_SIZE (32) | |
84 | ||
85 | /* This is used to hold the state of the BER objects being read. */ | |
86 | typedef struct ber_struct | |
87 | { | |
88 | int tag; | |
89 | int class; | |
90 | long length; | |
91 | int inf; | |
92 | int num_left; | |
93 | int depth; | |
94 | } BER_CTX; | |
95 | ||
96 | typedef struct bio_ber_struct | |
97 | { | |
98 | int tag; | |
99 | int class; | |
100 | long length; | |
101 | int inf; | |
102 | ||
103 | /* most of the following are used when doing non-blocking IO */ | |
104 | /* reading */ | |
105 | long num_left; /* number of bytes still to read/write in block */ | |
106 | int depth; /* used with idefinite encoding. */ | |
107 | int finished; /* No more read data */ | |
108 | ||
109 | /* writting */ | |
110 | char *w_addr; | |
111 | int w_offset; | |
112 | int w_left; | |
113 | ||
114 | int buf_len; | |
115 | int buf_off; | |
116 | unsigned char buf[BER_BUF_SIZE]; | |
117 | } BIO_BER_CTX; | |
118 | ||
119 | static BIO_METHOD methods_ber= | |
120 | { | |
121 | BIO_TYPE_CIPHER,"cipher", | |
122 | ber_write, | |
123 | ber_read, | |
124 | NULL, /* ber_puts, */ | |
125 | NULL, /* ber_gets, */ | |
126 | ber_ctrl, | |
127 | ber_new, | |
128 | ber_free, | |
129 | }; | |
130 | ||
6b691a5c | 131 | BIO_METHOD *BIO_f_ber(void) |
dfeab068 RE |
132 | { |
133 | return(&methods_ber); | |
134 | } | |
135 | ||
6b691a5c | 136 | static int ber_new(BIO *bi) |
dfeab068 RE |
137 | { |
138 | BIO_BER_CTX *ctx; | |
139 | ||
140 | ctx=(BIO_BER_CTX *)Malloc(sizeof(BIO_BER_CTX)); | |
141 | if (ctx == NULL) return(0); | |
142 | ||
143 | memset((char *)ctx,0,sizeof(BIO_BER_CTX)); | |
144 | ||
145 | bi->init=0; | |
146 | bi->ptr=(char *)ctx; | |
147 | bi->flags=0; | |
148 | return(1); | |
149 | } | |
150 | ||
6b691a5c | 151 | static int ber_free(BIO *a) |
dfeab068 RE |
152 | { |
153 | BIO_BER_CTX *b; | |
154 | ||
155 | if (a == NULL) return(0); | |
156 | b=(BIO_BER_CTX *)a->ptr; | |
157 | memset(a->ptr,0,sizeof(BIO_BER_CTX)); | |
158 | Free(a->ptr); | |
159 | a->ptr=NULL; | |
160 | a->init=0; | |
161 | a->flags=0; | |
162 | return(1); | |
163 | } | |
164 | ||
6b691a5c | 165 | int bio_ber_get_header(BIO *bio, BIO_BER_CTX *ctx) |
dfeab068 RE |
166 | { |
167 | char buf[64]; | |
168 | int i,j,n; | |
169 | int ret; | |
170 | unsigned char *p; | |
171 | unsigned long length | |
172 | int tag; | |
173 | int class; | |
174 | long max; | |
175 | ||
176 | BIO_clear_retry_flags(b); | |
177 | ||
178 | /* Pack the buffer down if there is a hole at the front */ | |
179 | if (ctx->buf_off != 0) | |
180 | { | |
181 | p=ctx->buf; | |
182 | j=ctx->buf_off; | |
183 | n=ctx->buf_len-j; | |
184 | for (i=0; i<n; i++) | |
185 | { | |
186 | p[0]=p[j]; | |
187 | p++; | |
188 | } | |
189 | ctx->buf_len-j; | |
190 | ctx->buf_off=0; | |
191 | } | |
192 | ||
193 | /* If there is more room, read some more data */ | |
194 | i=BER_BUF_SIZE-ctx->buf_len; | |
195 | if (i) | |
196 | { | |
197 | i=BIO_read(bio->next_bio,&(ctx->buf[ctx->buf_len]),i); | |
198 | if (i <= 0) | |
199 | { | |
200 | BIO_copy_next_retry(b); | |
201 | return(i); | |
202 | } | |
203 | else | |
204 | ctx->buf_len+=i; | |
205 | } | |
206 | ||
207 | max=ctx->buf_len; | |
208 | p=ctx->buf; | |
209 | ret=ASN1_get_object(&p,&length,&tag,&class,max); | |
210 | ||
211 | if (ret & 0x80) | |
212 | { | |
213 | if ((ctx->buf_len < BER_BUF_SIZE) && | |
214 | (ERR_GET_REASON(ERR_peek_error()) == ASN1_R_TOO_LONG)) | |
215 | { | |
216 | ERR_get_error(); /* clear the error */ | |
217 | BIO_set_retry_read(b); | |
218 | } | |
219 | return(-1); | |
220 | } | |
221 | ||
222 | /* We have no error, we have a header, so make use of it */ | |
223 | ||
224 | if ((ctx->tag >= 0) && (ctx->tag != tag)) | |
225 | { | |
226 | BIOerr(BIO_F_BIO_BER_GET_HEADER,BIO_R_TAG_MISMATCH); | |
227 | sprintf(buf,"tag=%d, got %d",ctx->tag,tag); | |
228 | ERR_add_error_data(1,buf); | |
229 | return(-1); | |
230 | } | |
231 | if (ret & 0x01) | |
232 | if (ret & V_ASN1_CONSTRUCTED) | |
233 | } | |
234 | ||
6b691a5c | 235 | static int ber_read(BIO *b, char *out, int outl) |
dfeab068 RE |
236 | { |
237 | int ret=0,i,n; | |
238 | BIO_BER_CTX *ctx; | |
239 | ||
240 | BIO_clear_retry_flags(b); | |
241 | ||
242 | if (out == NULL) return(0); | |
243 | ctx=(BIO_BER_CTX *)b->ptr; | |
244 | ||
245 | if ((ctx == NULL) || (b->next_bio == NULL)) return(0); | |
246 | ||
247 | if (ctx->finished) return(0); | |
248 | ||
249 | again: | |
250 | /* First see if we are half way through reading a block */ | |
251 | if (ctx->num_left > 0) | |
252 | { | |
253 | if (ctx->num_left < outl) | |
254 | n=ctx->num_left; | |
255 | else | |
256 | n=outl; | |
257 | i=BIO_read(b->next_bio,out,n); | |
258 | if (i <= 0) | |
259 | { | |
260 | BIO_copy_next_retry(b); | |
261 | return(i); | |
262 | } | |
263 | ctx->num_left-=i; | |
264 | outl-=i; | |
265 | ret+=i; | |
266 | if (ctx->num_left <= 0) | |
267 | { | |
268 | ctx->depth--; | |
269 | if (ctx->depth <= 0) | |
270 | ctx->finished=1; | |
271 | } | |
272 | if (outl <= 0) | |
273 | return(ret); | |
274 | else | |
275 | goto again; | |
276 | } | |
277 | else /* we need to read another BER header */ | |
278 | { | |
279 | } | |
280 | } | |
281 | ||
6b691a5c | 282 | static int ber_write(BIO *b, char *in, int inl) |
dfeab068 RE |
283 | { |
284 | int ret=0,n,i; | |
285 | BIO_ENC_CTX *ctx; | |
286 | ||
287 | ctx=(BIO_ENC_CTX *)b->ptr; | |
288 | ret=inl; | |
289 | ||
290 | BIO_clear_retry_flags(b); | |
291 | n=ctx->buf_len-ctx->buf_off; | |
292 | while (n > 0) | |
293 | { | |
294 | i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n); | |
295 | if (i <= 0) | |
296 | { | |
297 | BIO_copy_next_retry(b); | |
298 | return(i); | |
299 | } | |
300 | ctx->buf_off+=i; | |
301 | n-=i; | |
302 | } | |
303 | /* at this point all pending data has been written */ | |
304 | ||
305 | if ((in == NULL) || (inl <= 0)) return(0); | |
306 | ||
307 | ctx->buf_off=0; | |
308 | while (inl > 0) | |
309 | { | |
310 | n=(inl > ENC_BLOCK_SIZE)?ENC_BLOCK_SIZE:inl; | |
311 | EVP_CipherUpdate(&(ctx->cipher), | |
312 | (unsigned char *)ctx->buf,&ctx->buf_len, | |
313 | (unsigned char *)in,n); | |
314 | inl-=n; | |
315 | in+=n; | |
316 | ||
317 | ctx->buf_off=0; | |
318 | n=ctx->buf_len; | |
319 | while (n > 0) | |
320 | { | |
321 | i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n); | |
322 | if (i <= 0) | |
323 | { | |
324 | BIO_copy_next_retry(b); | |
325 | return(i); | |
326 | } | |
327 | n-=i; | |
328 | ctx->buf_off+=i; | |
329 | } | |
330 | ctx->buf_len=0; | |
331 | ctx->buf_off=0; | |
332 | } | |
333 | BIO_copy_next_retry(b); | |
334 | return(ret); | |
335 | } | |
336 | ||
6b691a5c | 337 | static long ber_ctrl(BIO *b, int cmd, long num, char *ptr) |
dfeab068 RE |
338 | { |
339 | BIO *dbio; | |
340 | BIO_ENC_CTX *ctx,*dctx; | |
341 | long ret=1; | |
342 | int i; | |
343 | ||
344 | ctx=(BIO_ENC_CTX *)b->ptr; | |
345 | ||
346 | switch (cmd) | |
347 | { | |
348 | case BIO_CTRL_RESET: | |
349 | ctx->ok=1; | |
350 | ctx->finished=0; | |
351 | EVP_CipherInit(&(ctx->cipher),NULL,NULL,NULL, | |
352 | ctx->cipher.berrypt); | |
353 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
354 | break; | |
355 | case BIO_CTRL_EOF: /* More to read */ | |
356 | if (ctx->cont <= 0) | |
357 | ret=1; | |
358 | else | |
359 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
360 | break; | |
361 | case BIO_CTRL_WPENDING: | |
362 | ret=ctx->buf_len-ctx->buf_off; | |
363 | if (ret <= 0) | |
364 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
365 | break; | |
366 | case BIO_CTRL_PENDING: /* More to read in buffer */ | |
367 | ret=ctx->buf_len-ctx->buf_off; | |
368 | if (ret <= 0) | |
369 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
370 | break; | |
371 | case BIO_CTRL_FLUSH: | |
372 | /* do a final write */ | |
373 | again: | |
374 | while (ctx->buf_len != ctx->buf_off) | |
375 | { | |
376 | i=ber_write(b,NULL,0); | |
377 | if (i < 0) | |
378 | { | |
379 | ret=i; | |
380 | break; | |
381 | } | |
382 | } | |
383 | ||
384 | if (!ctx->finished) | |
385 | { | |
386 | ctx->finished=1; | |
387 | ctx->buf_off=0; | |
388 | ret=EVP_CipherFinal(&(ctx->cipher), | |
389 | (unsigned char *)ctx->buf, | |
390 | &(ctx->buf_len)); | |
391 | ctx->ok=(int)ret; | |
392 | if (ret <= 0) break; | |
393 | ||
394 | /* push out the bytes */ | |
395 | goto again; | |
396 | } | |
397 | ||
398 | /* Finally flush the underlying BIO */ | |
399 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
400 | break; | |
401 | case BIO_C_GET_CIPHER_STATUS: | |
402 | ret=(long)ctx->ok; | |
403 | break; | |
404 | case BIO_C_DO_STATE_MACHINE: | |
405 | BIO_clear_retry_flags(b); | |
406 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
407 | BIO_copy_next_retry(b); | |
408 | break; | |
409 | ||
410 | case BIO_CTRL_DUP: | |
411 | dbio=(BIO *)ptr; | |
412 | dctx=(BIO_ENC_CTX *)dbio->ptr; | |
413 | memcpy(&(dctx->cipher),&(ctx->cipher),sizeof(ctx->cipher)); | |
414 | dbio->init=1; | |
415 | break; | |
416 | default: | |
417 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
418 | break; | |
419 | } | |
420 | return(ret); | |
421 | } | |
422 | ||
423 | /* | |
424 | void BIO_set_cipher_ctx(b,c) | |
425 | BIO *b; | |
426 | EVP_CIPHER_ctx *c; | |
427 | { | |
428 | if (b == NULL) return; | |
429 | ||
430 | if ((b->callback != NULL) && | |
431 | (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0)) | |
432 | return; | |
433 | ||
434 | b->init=1; | |
435 | ctx=(BIO_ENC_CTX *)b->ptr; | |
436 | memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX)); | |
437 | ||
438 | if (b->callback != NULL) | |
439 | b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L); | |
440 | } | |
441 | */ | |
442 | ||
6b691a5c UM |
443 | void BIO_set_cipher(BIO *b, EVP_CIPHER *c, unsigned char *k, unsigned char *i, |
444 | int e) | |
dfeab068 RE |
445 | { |
446 | BIO_ENC_CTX *ctx; | |
447 | ||
448 | if (b == NULL) return; | |
449 | ||
450 | if ((b->callback != NULL) && | |
451 | (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0)) | |
452 | return; | |
453 | ||
454 | b->init=1; | |
455 | ctx=(BIO_ENC_CTX *)b->ptr; | |
456 | EVP_CipherInit(&(ctx->cipher),c,k,i,e); | |
457 | ||
458 | if (b->callback != NULL) | |
459 | b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L); | |
460 | } | |
461 |