]>
Commit | Line | Data |
---|---|---|
d02b48c6 | 1 | /* crypto/evp/bio_b64.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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 | |
66 | static int b64_write(BIO *h,char *buf,int num); | |
67 | static 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); */ | |
70 | static long b64_ctrl(BIO *h,int cmd,long arg1,char *arg2); | |
71 | static int b64_new(BIO *h); | |
72 | static int b64_free(BIO *data); | |
73 | #else | |
74 | static int b64_write(); | |
75 | static int b64_read(); | |
76 | /*static int b64_puts(); */ | |
77 | /*static int b64_gets(); */ | |
78 | static long b64_ctrl(); | |
79 | static int b64_new(); | |
80 | static int b64_free(); | |
81 | #endif | |
82 | ||
83 | #define B64_BLOCK_SIZE 1024 | |
58964a49 | 84 | #define B64_BLOCK_SIZE2 768 |
d02b48c6 RE |
85 | #define B64_NONE 0 |
86 | #define B64_ENCODE 1 | |
87 | #define B64_DECODE 2 | |
88 | ||
89 | typedef 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 | ||
104 | static 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 | ||
116 | BIO_METHOD *BIO_f_base64() | |
117 | { | |
118 | return(&methods_b64); | |
119 | } | |
120 | ||
121 | static int b64_new(bi) | |
122 | BIO *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 | ||
143 | static int b64_free(a) | |
144 | BIO *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 | ||
154 | static int b64_read(b,out,outl) | |
155 | BIO *b; | |
156 | char *out; | |
157 | int outl; | |
158 | { | |
58964a49 | 159 | int ret=0,i,ii,j,k,x,n,num,ret_code=0; |
d02b48c6 RE |
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; | |
58964a49 | 173 | ctx->tmp_len=0; |
d02b48c6 RE |
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 | ||
58964a49 | 197 | ret_code=0; |
d02b48c6 RE |
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 | { | |
58964a49 RE |
207 | ret_code=i; |
208 | ||
d02b48c6 RE |
209 | /* Should be continue next time we are called? */ |
210 | if (!BIO_should_retry(b->next_bio)) | |
211 | ctx->cont=i; | |
58964a49 | 212 | /* else we should continue when called again */ |
d02b48c6 RE |
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. */ | |
58964a49 RE |
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) | |
d02b48c6 RE |
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 | } | |
58964a49 RE |
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 | } | |
d02b48c6 RE |
327 | ctx->cont=i; |
328 | ctx->buf_off=0; | |
329 | if (i < 0) | |
330 | { | |
58964a49 | 331 | ret_code=0; |
d02b48c6 RE |
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); | |
58964a49 | 354 | return((ret == 0)?ret_code:ret); |
d02b48c6 RE |
355 | } |
356 | ||
357 | static int b64_write(b,in,inl) | |
358 | BIO *b; | |
359 | char *in; | |
360 | int 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; | |
58964a49 | 373 | ctx->tmp_len=0; |
d02b48c6 RE |
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; | |
58964a49 RE |
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 | } | |
d02b48c6 RE |
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 | ||
454 | static long b64_ctrl(b,cmd,num,ptr) | |
455 | BIO *b; | |
456 | int cmd; | |
457 | long num; | |
458 | char *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 */ | |
494 | again: | |
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 | } | |
58964a49 RE |
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) | |
d02b48c6 RE |
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 |