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-rw-r--r--src/lib/libcrypto/evp/bio_b64.c549
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diff --git a/src/lib/libcrypto/evp/bio_b64.c b/src/lib/libcrypto/evp/bio_b64.c
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1/* crypto/evp/bio_b64.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 b64_write(BIO *h, const char *buf, int num);
66static int b64_read(BIO *h, char *buf, int size);
67/*static int b64_puts(BIO *h, const char *str); */
68/*static int b64_gets(BIO *h, char *str, int size); */
69static long b64_ctrl(BIO *h, int cmd, long arg1, void *arg2);
70static int b64_new(BIO *h);
71static int b64_free(BIO *data);
72static long b64_callback_ctrl(BIO *h,int cmd,bio_info_cb *fp);
73#define B64_BLOCK_SIZE 1024
74#define B64_BLOCK_SIZE2 768
75#define B64_NONE 0
76#define B64_ENCODE 1
77#define B64_DECODE 2
78
79typedef struct b64_struct
80 {
81 /*BIO *bio; moved to the BIO structure */
82 int buf_len;
83 int buf_off;
84 int tmp_len; /* used to find the start when decoding */
85 int tmp_nl; /* If true, scan until '\n' */
86 int encode;
87 int start; /* have we started decoding yet? */
88 int cont; /* <= 0 when finished */
89 EVP_ENCODE_CTX base64;
90 char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE)+10];
91 char tmp[B64_BLOCK_SIZE];
92 } BIO_B64_CTX;
93
94static BIO_METHOD methods_b64=
95 {
96 BIO_TYPE_BASE64,"base64 encoding",
97 b64_write,
98 b64_read,
99 NULL, /* b64_puts, */
100 NULL, /* b64_gets, */
101 b64_ctrl,
102 b64_new,
103 b64_free,
104 b64_callback_ctrl,
105 };
106
107BIO_METHOD *BIO_f_base64(void)
108 {
109 return(&methods_b64);
110 }
111
112static int b64_new(BIO *bi)
113 {
114 BIO_B64_CTX *ctx;
115
116 ctx=(BIO_B64_CTX *)OPENSSL_malloc(sizeof(BIO_B64_CTX));
117 if (ctx == NULL) return(0);
118
119 ctx->buf_len=0;
120 ctx->tmp_len=0;
121 ctx->tmp_nl=0;
122 ctx->buf_off=0;
123 ctx->cont=1;
124 ctx->start=1;
125 ctx->encode=0;
126
127 bi->init=1;
128 bi->ptr=(char *)ctx;
129 bi->flags=0;
130 return(1);
131 }
132
133static int b64_free(BIO *a)
134 {
135 if (a == NULL) return(0);
136 OPENSSL_free(a->ptr);
137 a->ptr=NULL;
138 a->init=0;
139 a->flags=0;
140 return(1);
141 }
142
143static int b64_read(BIO *b, char *out, int outl)
144 {
145 int ret=0,i,ii,j,k,x,n,num,ret_code=0;
146 BIO_B64_CTX *ctx;
147 unsigned char *p,*q;
148
149 if (out == NULL) return(0);
150 ctx=(BIO_B64_CTX *)b->ptr;
151
152 if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
153
154 if (ctx->encode != B64_DECODE)
155 {
156 ctx->encode=B64_DECODE;
157 ctx->buf_len=0;
158 ctx->buf_off=0;
159 ctx->tmp_len=0;
160 EVP_DecodeInit(&(ctx->base64));
161 }
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 OPENSSL_assert(ctx->buf_off+i < sizeof ctx->buf);
169 memcpy(out,&(ctx->buf[ctx->buf_off]),i);
170 ret=i;
171 out+=i;
172 outl-=i;
173 ctx->buf_off+=i;
174 if (ctx->buf_len == ctx->buf_off)
175 {
176 ctx->buf_len=0;
177 ctx->buf_off=0;
178 }
179 }
180
181 /* At this point, we have room of outl bytes and an empty
182 * buffer, so we should read in some more. */
183
184 ret_code=0;
185 while (outl > 0)
186 {
187 if (ctx->cont <= 0) break;
188
189 i=BIO_read(b->next_bio,&(ctx->tmp[ctx->tmp_len]),
190 B64_BLOCK_SIZE-ctx->tmp_len);
191
192 if (i <= 0)
193 {
194 ret_code=i;
195
196 /* Should be continue next time we are called? */
197 if (!BIO_should_retry(b->next_bio))
198 ctx->cont=i;
199 /* else we should continue when called again */
200 break;
201 }
202 i+=ctx->tmp_len;
203
204 /* We need to scan, a line at a time until we
205 * have a valid line if we are starting. */
206 if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL))
207 {
208 /* ctx->start=1; */
209 ctx->tmp_len=0;
210 }
211 else if (ctx->start)
212 {
213 q=p=(unsigned char *)ctx->tmp;
214 for (j=0; j<i; j++)
215 {
216 if (*(q++) != '\n') continue;
217
218 /* due to a previous very long line,
219 * we need to keep on scanning for a '\n'
220 * before we even start looking for
221 * base64 encoded stuff. */
222 if (ctx->tmp_nl)
223 {
224 p=q;
225 ctx->tmp_nl=0;
226 continue;
227 }
228
229 k=EVP_DecodeUpdate(&(ctx->base64),
230 (unsigned char *)ctx->buf,
231 &num,p,q-p);
232 if ((k <= 0) && (num == 0) && (ctx->start))
233 EVP_DecodeInit(&ctx->base64);
234 else
235 {
236 if (p != (unsigned char *)
237 &(ctx->tmp[0]))
238 {
239 i-=(p- (unsigned char *)
240 &(ctx->tmp[0]));
241 for (x=0; x < i; x++)
242 ctx->tmp[x]=p[x];
243 }
244 EVP_DecodeInit(&ctx->base64);
245 ctx->start=0;
246 break;
247 }
248 p=q;
249 }
250
251 /* we fell off the end without starting */
252 if (j == i)
253 {
254 /* Is this is one long chunk?, if so, keep on
255 * reading until a new line. */
256 if (p == (unsigned char *)&(ctx->tmp[0]))
257 {
258 ctx->tmp_nl=1;
259 ctx->tmp_len=0;
260 }
261 else if (p != q) /* finished on a '\n' */
262 {
263 n=q-p;
264 for (ii=0; ii<n; ii++)
265 ctx->tmp[ii]=p[ii];
266 ctx->tmp_len=n;
267 }
268 /* else finished on a '\n' */
269 continue;
270 }
271 else
272 ctx->tmp_len=0;
273 }
274
275 if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
276 {
277 int z,jj;
278
279 jj=(i>>2)<<2;
280 z=EVP_DecodeBlock((unsigned char *)ctx->buf,
281 (unsigned char *)ctx->tmp,jj);
282 if (jj > 2)
283 {
284 if (ctx->tmp[jj-1] == '=')
285 {
286 z--;
287 if (ctx->tmp[jj-2] == '=')
288 z--;
289 }
290 }
291 /* z is now number of output bytes and jj is the
292 * number consumed */
293 if (jj != i)
294 {
295 memcpy((unsigned char *)ctx->tmp,
296 (unsigned char *)&(ctx->tmp[jj]),i-jj);
297 ctx->tmp_len=i-jj;
298 }
299 ctx->buf_len=0;
300 if (z > 0)
301 {
302 ctx->buf_len=z;
303 i=1;
304 }
305 else
306 i=z;
307 }
308 else
309 {
310 i=EVP_DecodeUpdate(&(ctx->base64),
311 (unsigned char *)ctx->buf,&ctx->buf_len,
312 (unsigned char *)ctx->tmp,i);
313 }
314 ctx->cont=i;
315 ctx->buf_off=0;
316 if (i < 0)
317 {
318 ret_code=0;
319 ctx->buf_len=0;
320 break;
321 }
322
323 if (ctx->buf_len <= outl)
324 i=ctx->buf_len;
325 else
326 i=outl;
327
328 memcpy(out,ctx->buf,i);
329 ret+=i;
330 ctx->buf_off=i;
331 if (ctx->buf_off == ctx->buf_len)
332 {
333 ctx->buf_len=0;
334 ctx->buf_off=0;
335 }
336 outl-=i;
337 out+=i;
338 }
339 BIO_clear_retry_flags(b);
340 BIO_copy_next_retry(b);
341 return((ret == 0)?ret_code:ret);
342 }
343
344static int b64_write(BIO *b, const char *in, int inl)
345 {
346 int ret=inl,n,i;
347 BIO_B64_CTX *ctx;
348
349 ctx=(BIO_B64_CTX *)b->ptr;
350 BIO_clear_retry_flags(b);
351
352 if (ctx->encode != B64_ENCODE)
353 {
354 ctx->encode=B64_ENCODE;
355 ctx->buf_len=0;
356 ctx->buf_off=0;
357 ctx->tmp_len=0;
358 EVP_EncodeInit(&(ctx->base64));
359 }
360
361 n=ctx->buf_len-ctx->buf_off;
362 while (n > 0)
363 {
364 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
365 if (i <= 0)
366 {
367 BIO_copy_next_retry(b);
368 return(i);
369 }
370 ctx->buf_off+=i;
371 n-=i;
372 }
373 /* at this point all pending data has been written */
374 ctx->buf_off=0;
375 ctx->buf_len=0;
376
377 if ((in == NULL) || (inl <= 0)) return(0);
378
379 while (inl > 0)
380 {
381 n=(inl > B64_BLOCK_SIZE)?B64_BLOCK_SIZE:inl;
382
383 if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
384 {
385 if (ctx->tmp_len > 0)
386 {
387 n=3-ctx->tmp_len;
388 /* There's a teoretical possibility for this */
389 if (n > inl)
390 n=inl;
391 memcpy(&(ctx->tmp[ctx->tmp_len]),in,n);
392 ctx->tmp_len+=n;
393 if (ctx->tmp_len < 3)
394 break;
395 ctx->buf_len=EVP_EncodeBlock(
396 (unsigned char *)ctx->buf,
397 (unsigned char *)ctx->tmp,
398 ctx->tmp_len);
399 /* Since we're now done using the temporary
400 buffer, the length should be 0'd */
401 ctx->tmp_len=0;
402 }
403 else
404 {
405 if (n < 3)
406 {
407 memcpy(&(ctx->tmp[0]),in,n);
408 ctx->tmp_len=n;
409 break;
410 }
411 n-=n%3;
412 ctx->buf_len=EVP_EncodeBlock(
413 (unsigned char *)ctx->buf,
414 (unsigned char *)in,n);
415 }
416 }
417 else
418 {
419 EVP_EncodeUpdate(&(ctx->base64),
420 (unsigned char *)ctx->buf,&ctx->buf_len,
421 (unsigned char *)in,n);
422 }
423 inl-=n;
424 in+=n;
425
426 ctx->buf_off=0;
427 n=ctx->buf_len;
428 while (n > 0)
429 {
430 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
431 if (i <= 0)
432 {
433 BIO_copy_next_retry(b);
434 return((ret == 0)?i:ret);
435 }
436 n-=i;
437 ctx->buf_off+=i;
438 }
439 ctx->buf_len=0;
440 ctx->buf_off=0;
441 }
442 return(ret);
443 }
444
445static long b64_ctrl(BIO *b, int cmd, long num, void *ptr)
446 {
447 BIO_B64_CTX *ctx;
448 long ret=1;
449 int i;
450
451 ctx=(BIO_B64_CTX *)b->ptr;
452
453 switch (cmd)
454 {
455 case BIO_CTRL_RESET:
456 ctx->cont=1;
457 ctx->start=1;
458 ctx->encode=B64_NONE;
459 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
460 break;
461 case BIO_CTRL_EOF: /* More to read */
462 if (ctx->cont <= 0)
463 ret=1;
464 else
465 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
466 break;
467 case BIO_CTRL_WPENDING: /* More to write in buffer */
468 ret=ctx->buf_len-ctx->buf_off;
469 if ((ret == 0) && (ctx->encode != B64_NONE)
470 && (ctx->base64.num != 0))
471 ret=1;
472 else if (ret <= 0)
473 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
474 break;
475 case BIO_CTRL_PENDING: /* More to read in buffer */
476 ret=ctx->buf_len-ctx->buf_off;
477 if (ret <= 0)
478 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
479 break;
480 case BIO_CTRL_FLUSH:
481 /* do a final write */
482again:
483 while (ctx->buf_len != ctx->buf_off)
484 {
485 i=b64_write(b,NULL,0);
486 if (i < 0)
487 {
488 ret=i;
489 break;
490 }
491 }
492 if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
493 {
494 if (ctx->tmp_len != 0)
495 {
496 ctx->buf_len=EVP_EncodeBlock(
497 (unsigned char *)ctx->buf,
498 (unsigned char *)ctx->tmp,
499 ctx->tmp_len);
500 ctx->buf_off=0;
501 ctx->tmp_len=0;
502 goto again;
503 }
504 }
505 else if (ctx->encode != B64_NONE && ctx->base64.num != 0)
506 {
507 ctx->buf_off=0;
508 EVP_EncodeFinal(&(ctx->base64),
509 (unsigned char *)ctx->buf,
510 &(ctx->buf_len));
511 /* push out the bytes */
512 goto again;
513 }
514 /* Finally flush the underlying BIO */
515 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
516 break;
517
518 case BIO_C_DO_STATE_MACHINE:
519 BIO_clear_retry_flags(b);
520 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
521 BIO_copy_next_retry(b);
522 break;
523
524 case BIO_CTRL_DUP:
525 break;
526 case BIO_CTRL_INFO:
527 case BIO_CTRL_GET:
528 case BIO_CTRL_SET:
529 default:
530 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
531 break;
532 }
533 return(ret);
534 }
535
536static long b64_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
537 {
538 long ret=1;
539
540 if (b->next_bio == NULL) return(0);
541 switch (cmd)
542 {
543 default:
544 ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
545 break;
546 }
547 return(ret);
548 }
549
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