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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" | |
ec577822 BM |
62 | #include <openssl/buffer.h> |
63 | #include <openssl/evp.h> | |
d02b48c6 | 64 | |
d02b48c6 RE |
65 | static int b64_write(BIO *h,char *buf,int num); |
66 | static int b64_read(BIO *h,char *buf,int size); | |
67 | /*static int b64_puts(BIO *h,char *str); */ | |
68 | /*static int b64_gets(BIO *h,char *str,int size); */ | |
69 | static long b64_ctrl(BIO *h,int cmd,long arg1,char *arg2); | |
70 | static int b64_new(BIO *h); | |
71 | static int b64_free(BIO *data); | |
d02b48c6 | 72 | #define B64_BLOCK_SIZE 1024 |
58964a49 | 73 | #define B64_BLOCK_SIZE2 768 |
d02b48c6 RE |
74 | #define B64_NONE 0 |
75 | #define B64_ENCODE 1 | |
76 | #define B64_DECODE 2 | |
77 | ||
78 | typedef struct b64_struct | |
79 | { | |
80 | /*BIO *bio; moved to the BIO structure */ | |
81 | int buf_len; | |
82 | int buf_off; | |
83 | int tmp_len; /* used to find the start when decoding */ | |
84 | int tmp_nl; /* If true, scan until '\n' */ | |
85 | int encode; | |
86 | int start; /* have we started decoding yet? */ | |
87 | int cont; /* <= 0 when finished */ | |
88 | EVP_ENCODE_CTX base64; | |
89 | char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE)+10]; | |
90 | char tmp[B64_BLOCK_SIZE]; | |
91 | } BIO_B64_CTX; | |
92 | ||
93 | static BIO_METHOD methods_b64= | |
94 | { | |
95 | BIO_TYPE_BASE64,"base64 encoding", | |
96 | b64_write, | |
97 | b64_read, | |
98 | NULL, /* b64_puts, */ | |
99 | NULL, /* b64_gets, */ | |
100 | b64_ctrl, | |
101 | b64_new, | |
102 | b64_free, | |
103 | }; | |
104 | ||
6b691a5c | 105 | BIO_METHOD *BIO_f_base64(void) |
d02b48c6 RE |
106 | { |
107 | return(&methods_b64); | |
108 | } | |
109 | ||
6b691a5c | 110 | static int b64_new(BIO *bi) |
d02b48c6 RE |
111 | { |
112 | BIO_B64_CTX *ctx; | |
113 | ||
114 | ctx=(BIO_B64_CTX *)Malloc(sizeof(BIO_B64_CTX)); | |
115 | if (ctx == NULL) return(0); | |
116 | ||
117 | ctx->buf_len=0; | |
118 | ctx->tmp_len=0; | |
119 | ctx->tmp_nl=0; | |
120 | ctx->buf_off=0; | |
121 | ctx->cont=1; | |
122 | ctx->start=1; | |
123 | ctx->encode=0; | |
124 | ||
125 | bi->init=1; | |
126 | bi->ptr=(char *)ctx; | |
127 | bi->flags=0; | |
128 | return(1); | |
129 | } | |
130 | ||
6b691a5c | 131 | static int b64_free(BIO *a) |
d02b48c6 RE |
132 | { |
133 | if (a == NULL) return(0); | |
134 | Free(a->ptr); | |
135 | a->ptr=NULL; | |
136 | a->init=0; | |
137 | a->flags=0; | |
138 | return(1); | |
139 | } | |
140 | ||
6b691a5c | 141 | static int b64_read(BIO *b, char *out, int outl) |
d02b48c6 | 142 | { |
58964a49 | 143 | int ret=0,i,ii,j,k,x,n,num,ret_code=0; |
d02b48c6 RE |
144 | BIO_B64_CTX *ctx; |
145 | unsigned char *p,*q; | |
146 | ||
147 | if (out == NULL) return(0); | |
148 | ctx=(BIO_B64_CTX *)b->ptr; | |
149 | ||
150 | if ((ctx == NULL) || (b->next_bio == NULL)) return(0); | |
151 | ||
152 | if (ctx->encode != B64_DECODE) | |
153 | { | |
154 | ctx->encode=B64_DECODE; | |
155 | ctx->buf_len=0; | |
156 | ctx->buf_off=0; | |
58964a49 | 157 | ctx->tmp_len=0; |
d02b48c6 RE |
158 | EVP_DecodeInit(&(ctx->base64)); |
159 | } | |
160 | ||
161 | /* First check if there are bytes decoded/encoded */ | |
162 | if (ctx->buf_len > 0) | |
163 | { | |
164 | i=ctx->buf_len-ctx->buf_off; | |
165 | if (i > outl) i=outl; | |
166 | memcpy(out,&(ctx->buf[ctx->buf_off]),i); | |
167 | ret=i; | |
168 | out+=i; | |
169 | outl-=i; | |
170 | ctx->buf_off+=i; | |
171 | if (ctx->buf_len == ctx->buf_off) | |
172 | { | |
173 | ctx->buf_len=0; | |
174 | ctx->buf_off=0; | |
175 | } | |
176 | } | |
177 | ||
178 | /* At this point, we have room of outl bytes and an empty | |
179 | * buffer, so we should read in some more. */ | |
180 | ||
58964a49 | 181 | ret_code=0; |
d02b48c6 RE |
182 | while (outl > 0) |
183 | { | |
184 | if (ctx->cont <= 0) break; | |
185 | ||
186 | i=BIO_read(b->next_bio,&(ctx->tmp[ctx->tmp_len]), | |
187 | B64_BLOCK_SIZE-ctx->tmp_len); | |
188 | ||
189 | if (i <= 0) | |
190 | { | |
58964a49 RE |
191 | ret_code=i; |
192 | ||
d02b48c6 RE |
193 | /* Should be continue next time we are called? */ |
194 | if (!BIO_should_retry(b->next_bio)) | |
195 | ctx->cont=i; | |
58964a49 | 196 | /* else we should continue when called again */ |
d02b48c6 RE |
197 | break; |
198 | } | |
199 | i+=ctx->tmp_len; | |
200 | ||
201 | /* We need to scan, a line at a time until we | |
202 | * have a valid line if we are starting. */ | |
58964a49 RE |
203 | if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)) |
204 | { | |
205 | /* ctx->start=1; */ | |
206 | ctx->tmp_len=0; | |
207 | } | |
208 | else if (ctx->start) | |
d02b48c6 RE |
209 | { |
210 | q=p=(unsigned char *)ctx->tmp; | |
211 | for (j=0; j<i; j++) | |
212 | { | |
213 | if (*(q++) != '\n') continue; | |
214 | ||
215 | /* due to a previous very long line, | |
216 | * we need to keep on scanning for a '\n' | |
217 | * before we even start looking for | |
218 | * base64 encoded stuff. */ | |
219 | if (ctx->tmp_nl) | |
220 | { | |
221 | p=q; | |
222 | ctx->tmp_nl=0; | |
223 | continue; | |
224 | } | |
225 | ||
226 | k=EVP_DecodeUpdate(&(ctx->base64), | |
227 | (unsigned char *)ctx->buf, | |
228 | &num,p,q-p); | |
229 | if ((k <= 0) && (num == 0) && (ctx->start)) | |
230 | EVP_DecodeInit(&ctx->base64); | |
231 | else | |
232 | { | |
233 | if (p != (unsigned char *) | |
234 | &(ctx->tmp[0])) | |
235 | { | |
236 | i-=(p- (unsigned char *) | |
237 | &(ctx->tmp[0])); | |
238 | for (x=0; x < i; x++) | |
239 | ctx->tmp[x]=p[x]; | |
240 | EVP_DecodeInit(&ctx->base64); | |
241 | } | |
242 | ctx->start=0; | |
243 | break; | |
244 | } | |
245 | p=q; | |
246 | } | |
247 | ||
248 | /* we fell off the end without starting */ | |
249 | if (j == i) | |
250 | { | |
251 | /* Is this is one long chunk?, if so, keep on | |
252 | * reading until a new line. */ | |
253 | if (p == (unsigned char *)&(ctx->tmp[0])) | |
254 | { | |
255 | ctx->tmp_nl=1; | |
256 | ctx->tmp_len=0; | |
257 | } | |
258 | else if (p != q) /* finished on a '\n' */ | |
259 | { | |
260 | n=q-p; | |
261 | for (ii=0; ii<n; ii++) | |
262 | ctx->tmp[ii]=p[ii]; | |
263 | ctx->tmp_len=n; | |
264 | } | |
265 | /* else finished on a '\n' */ | |
266 | continue; | |
267 | } | |
268 | else | |
269 | ctx->tmp_len=0; | |
270 | } | |
58964a49 RE |
271 | |
272 | if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) | |
273 | { | |
274 | int z,jj; | |
275 | ||
276 | jj=(i>>2)<<2; | |
277 | z=EVP_DecodeBlock((unsigned char *)ctx->buf, | |
278 | (unsigned char *)ctx->tmp,jj); | |
279 | if (jj > 2) | |
280 | { | |
281 | if (ctx->tmp[jj-1] == '=') | |
282 | { | |
283 | z--; | |
284 | if (ctx->tmp[jj-2] == '=') | |
285 | z--; | |
286 | } | |
287 | } | |
288 | /* z is now number of output bytes and jj is the | |
289 | * number consumed */ | |
290 | if (jj != i) | |
291 | { | |
292 | memcpy((unsigned char *)ctx->tmp, | |
293 | (unsigned char *)&(ctx->tmp[jj]),i-jj); | |
294 | ctx->tmp_len=i-jj; | |
295 | } | |
296 | ctx->buf_len=0; | |
297 | if (z > 0) | |
298 | { | |
299 | ctx->buf_len=z; | |
300 | i=1; | |
301 | } | |
302 | else | |
303 | i=z; | |
304 | } | |
305 | else | |
306 | { | |
307 | i=EVP_DecodeUpdate(&(ctx->base64), | |
308 | (unsigned char *)ctx->buf,&ctx->buf_len, | |
309 | (unsigned char *)ctx->tmp,i); | |
310 | } | |
d02b48c6 RE |
311 | ctx->cont=i; |
312 | ctx->buf_off=0; | |
313 | if (i < 0) | |
314 | { | |
58964a49 | 315 | ret_code=0; |
d02b48c6 RE |
316 | ctx->buf_len=0; |
317 | break; | |
318 | } | |
319 | ||
320 | if (ctx->buf_len <= outl) | |
321 | i=ctx->buf_len; | |
322 | else | |
323 | i=outl; | |
324 | ||
325 | memcpy(out,ctx->buf,i); | |
326 | ret+=i; | |
327 | ctx->buf_off=i; | |
328 | if (ctx->buf_off == ctx->buf_len) | |
329 | { | |
330 | ctx->buf_len=0; | |
331 | ctx->buf_off=0; | |
332 | } | |
333 | outl-=i; | |
334 | out+=i; | |
335 | } | |
336 | BIO_clear_retry_flags(b); | |
337 | BIO_copy_next_retry(b); | |
58964a49 | 338 | return((ret == 0)?ret_code:ret); |
d02b48c6 RE |
339 | } |
340 | ||
6b691a5c | 341 | static int b64_write(BIO *b, char *in, int inl) |
d02b48c6 RE |
342 | { |
343 | int ret=inl,n,i; | |
344 | BIO_B64_CTX *ctx; | |
345 | ||
346 | ctx=(BIO_B64_CTX *)b->ptr; | |
347 | BIO_clear_retry_flags(b); | |
348 | ||
349 | if (ctx->encode != B64_ENCODE) | |
350 | { | |
351 | ctx->encode=B64_ENCODE; | |
352 | ctx->buf_len=0; | |
353 | ctx->buf_off=0; | |
58964a49 | 354 | ctx->tmp_len=0; |
d02b48c6 RE |
355 | EVP_EncodeInit(&(ctx->base64)); |
356 | } | |
357 | ||
358 | n=ctx->buf_len-ctx->buf_off; | |
359 | while (n > 0) | |
360 | { | |
361 | i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n); | |
362 | if (i <= 0) | |
363 | { | |
364 | BIO_copy_next_retry(b); | |
365 | return(i); | |
366 | } | |
367 | ctx->buf_off+=i; | |
368 | n-=i; | |
369 | } | |
370 | /* at this point all pending data has been written */ | |
371 | ||
372 | if ((in == NULL) || (inl <= 0)) return(0); | |
373 | ||
374 | ctx->buf_off=0; | |
375 | while (inl > 0) | |
376 | { | |
377 | n=(inl > B64_BLOCK_SIZE)?B64_BLOCK_SIZE:inl; | |
58964a49 RE |
378 | |
379 | if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) | |
380 | { | |
381 | if (ctx->tmp_len > 0) | |
382 | { | |
383 | n=3-ctx->tmp_len; | |
384 | memcpy(&(ctx->tmp[ctx->tmp_len]),in,n); | |
385 | ctx->tmp_len+=n; | |
386 | n=ctx->tmp_len; | |
387 | if (n < 3) | |
388 | break; | |
389 | ctx->buf_len=EVP_EncodeBlock( | |
390 | (unsigned char *)ctx->buf, | |
391 | (unsigned char *)ctx->tmp,n); | |
392 | } | |
393 | else | |
394 | { | |
395 | if (n < 3) | |
396 | { | |
397 | memcpy(&(ctx->tmp[0]),in,n); | |
398 | ctx->tmp_len=n; | |
399 | break; | |
400 | } | |
401 | n-=n%3; | |
402 | ctx->buf_len=EVP_EncodeBlock( | |
403 | (unsigned char *)ctx->buf, | |
404 | (unsigned char *)in,n); | |
405 | } | |
406 | } | |
407 | else | |
408 | { | |
409 | EVP_EncodeUpdate(&(ctx->base64), | |
410 | (unsigned char *)ctx->buf,&ctx->buf_len, | |
411 | (unsigned char *)in,n); | |
412 | } | |
d02b48c6 RE |
413 | inl-=n; |
414 | in+=n; | |
415 | ||
416 | ctx->buf_off=0; | |
417 | n=ctx->buf_len; | |
418 | while (n > 0) | |
419 | { | |
420 | i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n); | |
421 | if (i <= 0) | |
422 | { | |
423 | BIO_copy_next_retry(b); | |
424 | return((ret == 0)?i:ret); | |
425 | } | |
426 | n-=i; | |
427 | ctx->buf_off+=i; | |
428 | } | |
429 | ctx->buf_len=0; | |
430 | ctx->buf_off=0; | |
431 | } | |
432 | return(ret); | |
433 | } | |
434 | ||
6b691a5c | 435 | static long b64_ctrl(BIO *b, int cmd, long num, char *ptr) |
d02b48c6 RE |
436 | { |
437 | BIO_B64_CTX *ctx; | |
438 | long ret=1; | |
439 | int i; | |
440 | ||
441 | ctx=(BIO_B64_CTX *)b->ptr; | |
442 | ||
443 | switch (cmd) | |
444 | { | |
445 | case BIO_CTRL_RESET: | |
446 | ctx->cont=1; | |
447 | ctx->start=1; | |
448 | ctx->encode=B64_NONE; | |
449 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
450 | break; | |
451 | case BIO_CTRL_EOF: /* More to read */ | |
452 | if (ctx->cont <= 0) | |
453 | ret=1; | |
454 | else | |
455 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
456 | break; | |
457 | case BIO_CTRL_WPENDING: /* More to write in buffer */ | |
458 | ret=ctx->buf_len-ctx->buf_off; | |
459 | if ((ret == 0) && (ctx->base64.num != 0)) | |
460 | ret=1; | |
461 | else if (ret <= 0) | |
462 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
463 | break; | |
464 | case BIO_CTRL_PENDING: /* More to read in buffer */ | |
465 | ret=ctx->buf_len-ctx->buf_off; | |
466 | if (ret <= 0) | |
467 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
468 | break; | |
469 | case BIO_CTRL_FLUSH: | |
470 | /* do a final write */ | |
471 | again: | |
472 | while (ctx->buf_len != ctx->buf_off) | |
473 | { | |
474 | i=b64_write(b,NULL,0); | |
475 | if (i < 0) | |
476 | { | |
477 | ret=i; | |
478 | break; | |
479 | } | |
480 | } | |
58964a49 RE |
481 | if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) |
482 | { | |
483 | if (ctx->tmp_len != 0) | |
484 | { | |
485 | ctx->buf_len=EVP_EncodeBlock( | |
486 | (unsigned char *)ctx->buf, | |
487 | (unsigned char *)ctx->tmp, | |
488 | ctx->tmp_len); | |
489 | ctx->buf_off=0; | |
490 | ctx->tmp_len=0; | |
491 | goto again; | |
492 | } | |
493 | } | |
494 | else if (ctx->base64.num != 0) | |
d02b48c6 RE |
495 | { |
496 | ctx->buf_off=0; | |
497 | EVP_EncodeFinal(&(ctx->base64), | |
498 | (unsigned char *)ctx->buf, | |
499 | &(ctx->buf_len)); | |
500 | /* push out the bytes */ | |
501 | goto again; | |
502 | } | |
503 | /* Finally flush the underlying BIO */ | |
504 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
505 | break; | |
506 | ||
507 | case BIO_C_DO_STATE_MACHINE: | |
508 | BIO_clear_retry_flags(b); | |
509 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
510 | BIO_copy_next_retry(b); | |
511 | break; | |
512 | ||
513 | case BIO_CTRL_DUP: | |
514 | break; | |
515 | case BIO_CTRL_INFO: | |
516 | case BIO_CTRL_GET: | |
517 | case BIO_CTRL_SET: | |
518 | default: | |
519 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
520 | break; | |
521 | } | |
522 | return(ret); | |
523 | } | |
524 |