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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 "buffer.h"
63#include "evp.h"
64
65#ifndef NOPROTO
66static int b64_write(BIO *h,char *buf,int num);
67static int b64_read(BIO *h,char *buf,int size);
68/*static int b64_puts(BIO *h,char *str); */
69/*static int b64_gets(BIO *h,char *str,int size); */
70static long b64_ctrl(BIO *h,int cmd,long arg1,char *arg2);
71static int b64_new(BIO *h);
72static int b64_free(BIO *data);
73#else
74static int b64_write();
75static int b64_read();
76/*static int b64_puts(); */
77/*static int b64_gets(); */
78static long b64_ctrl();
79static int b64_new();
80static int b64_free();
81#endif
82
83#define B64_BLOCK_SIZE 1024
84#define B64_BLOCK_SIZE2 768
85#define B64_NONE 0
86#define B64_ENCODE 1
87#define B64_DECODE 2
88
89typedef struct b64_struct
90 {
91 /*BIO *bio; moved to the BIO structure */
92 int buf_len;
93 int buf_off;
94 int tmp_len; /* used to find the start when decoding */
95 int tmp_nl; /* If true, scan until '\n' */
96 int encode;
97 int start; /* have we started decoding yet? */
98 int cont; /* <= 0 when finished */
99 EVP_ENCODE_CTX base64;
100 char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE)+10];
101 char tmp[B64_BLOCK_SIZE];
102 } BIO_B64_CTX;
103
104static BIO_METHOD methods_b64=
105 {
106 BIO_TYPE_BASE64,"base64 encoding",
107 b64_write,
108 b64_read,
109 NULL, /* b64_puts, */
110 NULL, /* b64_gets, */
111 b64_ctrl,
112 b64_new,
113 b64_free,
114 };
115
116BIO_METHOD *BIO_f_base64()
117 {
118 return(&methods_b64);
119 }
120
121static int b64_new(bi)
122BIO *bi;
123 {
124 BIO_B64_CTX *ctx;
125
126 ctx=(BIO_B64_CTX *)Malloc(sizeof(BIO_B64_CTX));
127 if (ctx == NULL) return(0);
128
129 ctx->buf_len=0;
130 ctx->tmp_len=0;
131 ctx->tmp_nl=0;
132 ctx->buf_off=0;
133 ctx->cont=1;
134 ctx->start=1;
135 ctx->encode=0;
136
137 bi->init=1;
138 bi->ptr=(char *)ctx;
139 bi->flags=0;
140 return(1);
141 }
142
143static int b64_free(a)
144BIO *a;
145 {
146 if (a == NULL) return(0);
147 Free(a->ptr);
148 a->ptr=NULL;
149 a->init=0;
150 a->flags=0;
151 return(1);
152 }
153
154static int b64_read(b,out,outl)
155BIO *b;
156char *out;
157int outl;
158 {
159 int ret=0,i,ii,j,k,x,n,num,ret_code=0;
160 BIO_B64_CTX *ctx;
161 unsigned char *p,*q;
162
163 if (out == NULL) return(0);
164 ctx=(BIO_B64_CTX *)b->ptr;
165
166 if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
167
168 if (ctx->encode != B64_DECODE)
169 {
170 ctx->encode=B64_DECODE;
171 ctx->buf_len=0;
172 ctx->buf_off=0;
173 ctx->tmp_len=0;
174 EVP_DecodeInit(&(ctx->base64));
175 }
176
177 /* First check if there are bytes decoded/encoded */
178 if (ctx->buf_len > 0)
179 {
180 i=ctx->buf_len-ctx->buf_off;
181 if (i > outl) i=outl;
182 memcpy(out,&(ctx->buf[ctx->buf_off]),i);
183 ret=i;
184 out+=i;
185 outl-=i;
186 ctx->buf_off+=i;
187 if (ctx->buf_len == ctx->buf_off)
188 {
189 ctx->buf_len=0;
190 ctx->buf_off=0;
191 }
192 }
193
194 /* At this point, we have room of outl bytes and an empty
195 * buffer, so we should read in some more. */
196
197 ret_code=0;
198 while (outl > 0)
199 {
200 if (ctx->cont <= 0) break;
201
202 i=BIO_read(b->next_bio,&(ctx->tmp[ctx->tmp_len]),
203 B64_BLOCK_SIZE-ctx->tmp_len);
204
205 if (i <= 0)
206 {
207 ret_code=i;
208
209 /* Should be continue next time we are called? */
210 if (!BIO_should_retry(b->next_bio))
211 ctx->cont=i;
212 /* else we should continue when called again */
213 break;
214 }
215 i+=ctx->tmp_len;
216
217 /* We need to scan, a line at a time until we
218 * have a valid line if we are starting. */
219 if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL))
220 {
221 /* ctx->start=1; */
222 ctx->tmp_len=0;
223 }
224 else if (ctx->start)
225 {
226 q=p=(unsigned char *)ctx->tmp;
227 for (j=0; j<i; j++)
228 {
229 if (*(q++) != '\n') continue;
230
231 /* due to a previous very long line,
232 * we need to keep on scanning for a '\n'
233 * before we even start looking for
234 * base64 encoded stuff. */
235 if (ctx->tmp_nl)
236 {
237 p=q;
238 ctx->tmp_nl=0;
239 continue;
240 }
241
242 k=EVP_DecodeUpdate(&(ctx->base64),
243 (unsigned char *)ctx->buf,
244 &num,p,q-p);
245 if ((k <= 0) && (num == 0) && (ctx->start))
246 EVP_DecodeInit(&ctx->base64);
247 else
248 {
249 if (p != (unsigned char *)
250 &(ctx->tmp[0]))
251 {
252 i-=(p- (unsigned char *)
253 &(ctx->tmp[0]));
254 for (x=0; x < i; x++)
255 ctx->tmp[x]=p[x];
256 EVP_DecodeInit(&ctx->base64);
257 }
258 ctx->start=0;
259 break;
260 }
261 p=q;
262 }
263
264 /* we fell off the end without starting */
265 if (j == i)
266 {
267 /* Is this is one long chunk?, if so, keep on
268 * reading until a new line. */
269 if (p == (unsigned char *)&(ctx->tmp[0]))
270 {
271 ctx->tmp_nl=1;
272 ctx->tmp_len=0;
273 }
274 else if (p != q) /* finished on a '\n' */
275 {
276 n=q-p;
277 for (ii=0; ii<n; ii++)
278 ctx->tmp[ii]=p[ii];
279 ctx->tmp_len=n;
280 }
281 /* else finished on a '\n' */
282 continue;
283 }
284 else
285 ctx->tmp_len=0;
286 }
287
288 if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
289 {
290 int z,jj;
291
292 jj=(i>>2)<<2;
293 z=EVP_DecodeBlock((unsigned char *)ctx->buf,
294 (unsigned char *)ctx->tmp,jj);
295 if (jj > 2)
296 {
297 if (ctx->tmp[jj-1] == '=')
298 {
299 z--;
300 if (ctx->tmp[jj-2] == '=')
301 z--;
302 }
303 }
304 /* z is now number of output bytes and jj is the
305 * number consumed */
306 if (jj != i)
307 {
308 memcpy((unsigned char *)ctx->tmp,
309 (unsigned char *)&(ctx->tmp[jj]),i-jj);
310 ctx->tmp_len=i-jj;
311 }
312 ctx->buf_len=0;
313 if (z > 0)
314 {
315 ctx->buf_len=z;
316 i=1;
317 }
318 else
319 i=z;
320 }
321 else
322 {
323 i=EVP_DecodeUpdate(&(ctx->base64),
324 (unsigned char *)ctx->buf,&ctx->buf_len,
325 (unsigned char *)ctx->tmp,i);
326 }
327 ctx->cont=i;
328 ctx->buf_off=0;
329 if (i < 0)
330 {
331 ret_code=0;
332 ctx->buf_len=0;
333 break;
334 }
335
336 if (ctx->buf_len <= outl)
337 i=ctx->buf_len;
338 else
339 i=outl;
340
341 memcpy(out,ctx->buf,i);
342 ret+=i;
343 ctx->buf_off=i;
344 if (ctx->buf_off == ctx->buf_len)
345 {
346 ctx->buf_len=0;
347 ctx->buf_off=0;
348 }
349 outl-=i;
350 out+=i;
351 }
352 BIO_clear_retry_flags(b);
353 BIO_copy_next_retry(b);
354 return((ret == 0)?ret_code:ret);
355 }
356
357static int b64_write(b,in,inl)
358BIO *b;
359char *in;
360int inl;
361 {
362 int ret=inl,n,i;
363 BIO_B64_CTX *ctx;
364
365 ctx=(BIO_B64_CTX *)b->ptr;
366 BIO_clear_retry_flags(b);
367
368 if (ctx->encode != B64_ENCODE)
369 {
370 ctx->encode=B64_ENCODE;
371 ctx->buf_len=0;
372 ctx->buf_off=0;
373 ctx->tmp_len=0;
374 EVP_EncodeInit(&(ctx->base64));
375 }
376
377 n=ctx->buf_len-ctx->buf_off;
378 while (n > 0)
379 {
380 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
381 if (i <= 0)
382 {
383 BIO_copy_next_retry(b);
384 return(i);
385 }
386 ctx->buf_off+=i;
387 n-=i;
388 }
389 /* at this point all pending data has been written */
390
391 if ((in == NULL) || (inl <= 0)) return(0);
392
393 ctx->buf_off=0;
394 while (inl > 0)
395 {
396 n=(inl > B64_BLOCK_SIZE)?B64_BLOCK_SIZE:inl;
397
398 if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
399 {
400 if (ctx->tmp_len > 0)
401 {
402 n=3-ctx->tmp_len;
403 memcpy(&(ctx->tmp[ctx->tmp_len]),in,n);
404 ctx->tmp_len+=n;
405 n=ctx->tmp_len;
406 if (n < 3)
407 break;
408 ctx->buf_len=EVP_EncodeBlock(
409 (unsigned char *)ctx->buf,
410 (unsigned char *)ctx->tmp,n);
411 }
412 else
413 {
414 if (n < 3)
415 {
416 memcpy(&(ctx->tmp[0]),in,n);
417 ctx->tmp_len=n;
418 break;
419 }
420 n-=n%3;
421 ctx->buf_len=EVP_EncodeBlock(
422 (unsigned char *)ctx->buf,
423 (unsigned char *)in,n);
424 }
425 }
426 else
427 {
428 EVP_EncodeUpdate(&(ctx->base64),
429 (unsigned char *)ctx->buf,&ctx->buf_len,
430 (unsigned char *)in,n);
431 }
432 inl-=n;
433 in+=n;
434
435 ctx->buf_off=0;
436 n=ctx->buf_len;
437 while (n > 0)
438 {
439 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
440 if (i <= 0)
441 {
442 BIO_copy_next_retry(b);
443 return((ret == 0)?i:ret);
444 }
445 n-=i;
446 ctx->buf_off+=i;
447 }
448 ctx->buf_len=0;
449 ctx->buf_off=0;
450 }
451 return(ret);
452 }
453
454static long b64_ctrl(b,cmd,num,ptr)
455BIO *b;
456int cmd;
457long num;
458char *ptr;
459 {
460 BIO_B64_CTX *ctx;
461 long ret=1;
462 int i;
463
464 ctx=(BIO_B64_CTX *)b->ptr;
465
466 switch (cmd)
467 {
468 case BIO_CTRL_RESET:
469 ctx->cont=1;
470 ctx->start=1;
471 ctx->encode=B64_NONE;
472 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
473 break;
474 case BIO_CTRL_EOF: /* More to read */
475 if (ctx->cont <= 0)
476 ret=1;
477 else
478 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
479 break;
480 case BIO_CTRL_WPENDING: /* More to write in buffer */
481 ret=ctx->buf_len-ctx->buf_off;
482 if ((ret == 0) && (ctx->base64.num != 0))
483 ret=1;
484 else if (ret <= 0)
485 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
486 break;
487 case BIO_CTRL_PENDING: /* More to read in buffer */
488 ret=ctx->buf_len-ctx->buf_off;
489 if (ret <= 0)
490 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
491 break;
492 case BIO_CTRL_FLUSH:
493 /* do a final write */
494again:
495 while (ctx->buf_len != ctx->buf_off)
496 {
497 i=b64_write(b,NULL,0);
498 if (i < 0)
499 {
500 ret=i;
501 break;
502 }
503 }
504 if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
505 {
506 if (ctx->tmp_len != 0)
507 {
508 ctx->buf_len=EVP_EncodeBlock(
509 (unsigned char *)ctx->buf,
510 (unsigned char *)ctx->tmp,
511 ctx->tmp_len);
512 ctx->buf_off=0;
513 ctx->tmp_len=0;
514 goto again;
515 }
516 }
517 else if (ctx->base64.num != 0)
518 {
519 ctx->buf_off=0;
520 EVP_EncodeFinal(&(ctx->base64),
521 (unsigned char *)ctx->buf,
522 &(ctx->buf_len));
523 /* push out the bytes */
524 goto again;
525 }
526 /* Finally flush the underlying BIO */
527 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
528 break;
529
530 case BIO_C_DO_STATE_MACHINE:
531 BIO_clear_retry_flags(b);
532 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
533 BIO_copy_next_retry(b);
534 break;
535
536 case BIO_CTRL_DUP:
537 break;
538 case BIO_CTRL_INFO:
539 case BIO_CTRL_GET:
540 case BIO_CTRL_SET:
541 default:
542 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
543 break;
544 }
545 return(ret);
546 }
547
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