Line data Source code
1 : /* base64.c
2 : * Copyright (C) 2001, 2003, 2010 Free Software Foundation, Inc.
3 : *
4 : * This file is part of GnuPG.
5 : *
6 : * GnuPG is free software; you can redistribute it and/or modify
7 : * it under the terms of the GNU General Public License as published by
8 : * the Free Software Foundation; either version 3 of the License, or
9 : * (at your option) any later version.
10 : *
11 : * GnuPG is distributed in the hope that it will be useful,
12 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 : * GNU General Public License for more details.
15 : *
16 : * You should have received a copy of the GNU General Public License
17 : * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 : */
19 :
20 : #include <config.h>
21 : #include <stdio.h>
22 : #include <stdlib.h>
23 : #include <string.h>
24 : #include <errno.h>
25 : #include <unistd.h>
26 : #include <time.h>
27 : #include <assert.h>
28 :
29 : #include "gpgsm.h"
30 :
31 :
32 : #include <ksba.h>
33 :
34 : #include "i18n.h"
35 :
36 : #ifdef HAVE_DOSISH_SYSTEM
37 : #define LF "\r\n"
38 : #else
39 : #define LF "\n"
40 : #endif
41 :
42 : /* Data used by the reader callbacks. */
43 : struct reader_cb_parm_s
44 : {
45 : estream_t fp;
46 :
47 : unsigned char line[1024];
48 : int linelen;
49 : int readpos;
50 : int have_lf;
51 : unsigned long line_counter;
52 :
53 : int allow_multi_pem; /* Allow processing of multiple PEM objects. */
54 : int autodetect; /* Try to detect the input encoding. */
55 : int assume_pem; /* Assume input encoding is PEM. */
56 : int assume_base64; /* Assume input is base64 encoded. */
57 :
58 : int identified;
59 : int is_pem;
60 : int is_base64;
61 : int stop_seen;
62 : int might_be_smime;
63 :
64 : int eof_seen;
65 :
66 : struct {
67 : int idx;
68 : unsigned char val;
69 : int stop_seen;
70 : } base64;
71 : };
72 :
73 :
74 : /* Data used by the writer callbacks. */
75 : struct writer_cb_parm_s
76 : {
77 : estream_t stream; /* Output stream. */
78 :
79 : const char *pem_name;
80 :
81 : int wrote_begin;
82 : int did_finish;
83 :
84 : struct {
85 : int idx;
86 : int quad_count;
87 : unsigned char radbuf[4];
88 : } base64;
89 :
90 : };
91 :
92 :
93 : /* context for this module's functions */
94 : struct base64_context_s {
95 : union {
96 : struct reader_cb_parm_s rparm;
97 : struct writer_cb_parm_s wparm;
98 : } u;
99 :
100 : union {
101 : ksba_reader_t reader;
102 : ksba_writer_t writer;
103 : } u2;
104 : };
105 :
106 :
107 : /* The base-64 character list */
108 : static char bintoasc[64] =
109 : "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
110 : "abcdefghijklmnopqrstuvwxyz"
111 : "0123456789+/";
112 : /* The reverse base-64 list */
113 : static unsigned char asctobin[256] = {
114 : 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
115 : 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
116 : 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
117 : 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
118 : 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff, 0xff,
119 : 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
120 : 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12,
121 : 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
122 : 0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24,
123 : 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
124 : 0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
125 : 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
126 : 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
127 : 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
128 : 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
129 : 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
130 : 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
131 : 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
132 : 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
133 : 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
134 : 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
135 : 0xff, 0xff, 0xff, 0xff
136 : };
137 :
138 :
139 : static int
140 0 : has_only_base64 (const unsigned char *line, int linelen)
141 : {
142 0 : if (linelen < 20)
143 0 : return 0;
144 0 : for (; linelen; line++, linelen--)
145 : {
146 0 : if (*line == '\n' || (linelen > 1 && *line == '\r' && line[1] == '\n'))
147 : break;
148 0 : if ( !strchr (bintoasc, *line) )
149 0 : return 0;
150 : }
151 0 : return 1; /* yes */
152 : }
153 :
154 : static int
155 0 : is_empty_line (const unsigned char *line, int linelen)
156 : {
157 0 : if (linelen >= 2 && *line == '\r' && line[1] == '\n')
158 0 : return 1;
159 0 : if (linelen >= 1 && *line == '\n')
160 0 : return 1;
161 0 : return 0;
162 : }
163 :
164 :
165 : static int
166 680 : base64_reader_cb (void *cb_value, char *buffer, size_t count, size_t *nread)
167 : {
168 680 : struct reader_cb_parm_s *parm = cb_value;
169 : size_t n;
170 : int c, c2;
171 :
172 680 : *nread = 0;
173 680 : if (!buffer)
174 0 : return -1; /* not supported */
175 :
176 : next:
177 696 : if (!parm->linelen)
178 : {
179 : /* read an entire line or up to the size of the buffer */
180 86 : parm->line_counter++;
181 86 : parm->have_lf = 0;
182 4561 : for (n=0; n < DIM(parm->line);)
183 : {
184 4475 : c = es_getc (parm->fp);
185 4475 : if (c == EOF)
186 : {
187 3 : parm->eof_seen = 1;
188 3 : if (es_ferror (parm->fp))
189 0 : return -1;
190 3 : break;
191 : }
192 4472 : parm->line[n++] = c;
193 4472 : if (c == '\n')
194 : {
195 83 : parm->have_lf = 1;
196 : /* Fixme: we need to skip overlong lines while detecting
197 : the dashed lines */
198 83 : break;
199 : }
200 : }
201 86 : parm->linelen = n;
202 86 : if (!n)
203 3 : return -1; /* eof */
204 83 : parm->readpos = 0;
205 : }
206 :
207 693 : if (!parm->identified)
208 : {
209 19 : if (!parm->autodetect)
210 : {
211 0 : if (parm->assume_pem)
212 : {
213 : /* wait for the header line */
214 0 : parm->linelen = parm->readpos = 0;
215 0 : if (!parm->have_lf
216 0 : || strncmp ((char*)parm->line, "-----BEGIN ", 11)
217 0 : || !strncmp ((char*)parm->line+11, "PGP ", 4))
218 : goto next;
219 0 : parm->is_pem = 1;
220 : }
221 0 : else if (parm->assume_base64)
222 0 : parm->is_base64 = 1;
223 : }
224 19 : else if (parm->line_counter == 1 && !parm->have_lf)
225 : {
226 : /* first line too long - assume DER encoding */
227 0 : parm->is_pem = 0;
228 : }
229 19 : else if (parm->line_counter == 1 && parm->linelen && *parm->line == 0x30)
230 : {
231 : /* the very first byte does pretty much look like a SEQUENCE tag*/
232 0 : parm->is_pem = 0;
233 : }
234 19 : else if ( parm->have_lf
235 19 : && !strncmp ((char*)parm->line, "-----BEGIN ", 11)
236 3 : && strncmp ((char *)parm->line+11, "PGP ", 4) )
237 : {
238 : /* Fixme: we must only compare if the line really starts at
239 : the beginning */
240 3 : parm->is_pem = 1;
241 3 : parm->linelen = parm->readpos = 0;
242 : }
243 16 : else if ( parm->have_lf && parm->line_counter == 1
244 1 : && parm->linelen >= 13
245 0 : && !ascii_memcasecmp (parm->line, "Content-Type:", 13))
246 : { /* might be a S/MIME body */
247 0 : parm->might_be_smime = 1;
248 0 : parm->linelen = parm->readpos = 0;
249 0 : goto next;
250 : }
251 16 : else if (parm->might_be_smime == 1
252 0 : && is_empty_line (parm->line, parm->linelen))
253 : {
254 0 : parm->might_be_smime = 2;
255 0 : parm->linelen = parm->readpos = 0;
256 0 : goto next;
257 : }
258 16 : else if (parm->might_be_smime == 2)
259 : {
260 0 : parm->might_be_smime = 0;
261 0 : if ( !has_only_base64 (parm->line, parm->linelen))
262 : {
263 0 : parm->linelen = parm->readpos = 0;
264 0 : goto next;
265 : }
266 0 : parm->is_pem = 1;
267 : }
268 : else
269 : {
270 16 : parm->linelen = parm->readpos = 0;
271 16 : goto next;
272 : }
273 3 : parm->identified = 1;
274 3 : parm->base64.stop_seen = 0;
275 3 : parm->base64.idx = 0;
276 : }
277 :
278 :
279 677 : n = 0;
280 677 : if (parm->is_pem || parm->is_base64)
281 : {
282 1351 : if (parm->is_pem && parm->have_lf
283 677 : && !strncmp ((char*)parm->line, "-----END ", 9))
284 : {
285 3 : parm->identified = 0;
286 3 : parm->linelen = parm->readpos = 0;
287 :
288 : /* If the caller want to read multiple PEM objects from one
289 : file, we have to reset our internal state and return a
290 : EOF immediately. The caller is the expected to use
291 : ksba_reader_clear to clear the EOF condition and continue
292 : to read. If we don't want to do that we just return 0
293 : bytes which will force the ksba_reader to skip until
294 : EOF. */
295 3 : if (parm->allow_multi_pem)
296 : {
297 3 : parm->identified = 0;
298 3 : parm->autodetect = 0;
299 3 : parm->assume_pem = 1;
300 3 : parm->stop_seen = 0;
301 3 : return -1; /* Send EOF now. */
302 : }
303 : }
304 674 : else if (parm->stop_seen)
305 : { /* skip the rest of the line */
306 3 : parm->linelen = parm->readpos = 0;
307 : }
308 : else
309 : {
310 671 : int idx = parm->base64.idx;
311 671 : unsigned char val = parm->base64.val;
312 :
313 5160 : while (n < count && parm->readpos < parm->linelen )
314 : {
315 3821 : c = parm->line[parm->readpos++];
316 3821 : if (c == '\n' || c == ' ' || c == '\r' || c == '\t')
317 58 : continue;
318 3763 : if (c == '=')
319 : { /* pad character: stop */
320 3 : if (idx == 1)
321 0 : buffer[n++] = val;
322 3 : parm->stop_seen = 1;
323 3 : break;
324 : }
325 3760 : if( (c = asctobin[(c2=c)]) == 255 )
326 : {
327 0 : log_error (_("invalid radix64 character %02x skipped\n"),
328 : c2);
329 0 : continue;
330 : }
331 3760 : switch (idx)
332 : {
333 : case 0:
334 941 : val = c << 2;
335 941 : break;
336 : case 1:
337 941 : val |= (c>>4)&3;
338 941 : buffer[n++] = val;
339 941 : val = (c<<4)&0xf0;
340 941 : break;
341 : case 2:
342 940 : val |= (c>>2)&15;
343 940 : buffer[n++] = val;
344 940 : val = (c<<6)&0xc0;
345 940 : break;
346 : case 3:
347 938 : val |= c&0x3f;
348 938 : buffer[n++] = val;
349 938 : break;
350 : }
351 3760 : idx = (idx+1) % 4;
352 : }
353 671 : if (parm->readpos == parm->linelen)
354 61 : parm->linelen = parm->readpos = 0;
355 :
356 671 : parm->base64.idx = idx;
357 671 : parm->base64.val = val;
358 : }
359 : }
360 : else
361 : { /* DER encoded */
362 0 : while (n < count && parm->readpos < parm->linelen)
363 0 : buffer[n++] = parm->line[parm->readpos++];
364 0 : if (parm->readpos == parm->linelen)
365 0 : parm->linelen = parm->readpos = 0;
366 : }
367 :
368 674 : *nread = n;
369 674 : return 0;
370 : }
371 :
372 :
373 :
374 : static int
375 0 : simple_reader_cb (void *cb_value, char *buffer, size_t count, size_t *nread)
376 : {
377 0 : struct reader_cb_parm_s *parm = cb_value;
378 : size_t n;
379 0 : int c = 0;
380 :
381 0 : *nread = 0;
382 0 : if (!buffer)
383 0 : return -1; /* not supported */
384 :
385 0 : for (n=0; n < count; n++)
386 : {
387 0 : c = es_getc (parm->fp);
388 0 : if (c == EOF)
389 : {
390 0 : parm->eof_seen = 1;
391 0 : if (es_ferror (parm->fp))
392 0 : return -1;
393 0 : if (n)
394 0 : break; /* Return what we have before an EOF. */
395 0 : return -1;
396 : }
397 0 : *(byte *)buffer++ = c;
398 : }
399 :
400 0 : *nread = n;
401 0 : return 0;
402 : }
403 :
404 :
405 :
406 :
407 : static int
408 0 : base64_writer_cb (void *cb_value, const void *buffer, size_t count)
409 : {
410 0 : struct writer_cb_parm_s *parm = cb_value;
411 : unsigned char radbuf[4];
412 : int i, c, idx, quad_count;
413 : const unsigned char *p;
414 0 : estream_t stream = parm->stream;
415 :
416 0 : if (!count)
417 0 : return 0;
418 :
419 0 : if (!parm->wrote_begin)
420 : {
421 0 : if (parm->pem_name)
422 : {
423 0 : es_fputs ("-----BEGIN ", stream);
424 0 : es_fputs (parm->pem_name, stream);
425 0 : es_fputs ("-----\n", stream);
426 : }
427 0 : parm->wrote_begin = 1;
428 0 : parm->base64.idx = 0;
429 0 : parm->base64.quad_count = 0;
430 : }
431 :
432 0 : idx = parm->base64.idx;
433 0 : quad_count = parm->base64.quad_count;
434 0 : for (i=0; i < idx; i++)
435 0 : radbuf[i] = parm->base64.radbuf[i];
436 :
437 0 : for (p=buffer; count; p++, count--)
438 : {
439 0 : radbuf[idx++] = *p;
440 0 : if (idx > 2)
441 : {
442 0 : idx = 0;
443 0 : c = bintoasc[(*radbuf >> 2) & 077];
444 0 : es_putc (c, stream);
445 0 : c = bintoasc[(((*radbuf<<4)&060)|((radbuf[1] >> 4)&017))&077];
446 0 : es_putc (c, stream);
447 0 : c = bintoasc[(((radbuf[1]<<2)&074)|((radbuf[2]>>6)&03))&077];
448 0 : es_putc (c, stream);
449 0 : c = bintoasc[radbuf[2]&077];
450 0 : es_putc (c, stream);
451 0 : if (++quad_count >= (64/4))
452 : {
453 0 : es_fputs (LF, stream);
454 0 : quad_count = 0;
455 : }
456 : }
457 : }
458 0 : for (i=0; i < idx; i++)
459 0 : parm->base64.radbuf[i] = radbuf[i];
460 0 : parm->base64.idx = idx;
461 0 : parm->base64.quad_count = quad_count;
462 :
463 0 : return es_ferror (stream)? gpg_error_from_syserror () : 0;
464 : }
465 :
466 :
467 : /* This callback is only used in stream mode. Hiowever, we don't
468 : restrict it to this. */
469 : static int
470 0 : plain_writer_cb (void *cb_value, const void *buffer, size_t count)
471 : {
472 0 : struct writer_cb_parm_s *parm = cb_value;
473 0 : estream_t stream = parm->stream;
474 :
475 0 : if (!count)
476 0 : return 0;
477 :
478 0 : es_write (stream, buffer, count, NULL);
479 :
480 0 : return es_ferror (stream)? gpg_error_from_syserror () : 0;
481 : }
482 :
483 :
484 : static int
485 0 : base64_finish_write (struct writer_cb_parm_s *parm)
486 : {
487 : unsigned char *radbuf;
488 : int c, idx, quad_count;
489 0 : estream_t stream = parm->stream;
490 :
491 0 : if (!parm->wrote_begin)
492 0 : return 0; /* Nothing written or we are not called in base-64 mode. */
493 :
494 : /* flush the base64 encoding */
495 0 : idx = parm->base64.idx;
496 0 : quad_count = parm->base64.quad_count;
497 0 : if (idx)
498 : {
499 0 : radbuf = parm->base64.radbuf;
500 :
501 0 : c = bintoasc[(*radbuf>>2)&077];
502 0 : es_putc (c, stream);
503 0 : if (idx == 1)
504 : {
505 0 : c = bintoasc[((*radbuf << 4) & 060) & 077];
506 0 : es_putc (c, stream);
507 0 : es_putc ('=', stream);
508 0 : es_putc ('=', stream);
509 : }
510 : else
511 : {
512 0 : c = bintoasc[(((*radbuf<<4)&060)|((radbuf[1]>>4)&017))&077];
513 0 : es_putc (c, stream);
514 0 : c = bintoasc[((radbuf[1] << 2) & 074) & 077];
515 0 : es_putc (c, stream);
516 0 : es_putc ('=', stream);
517 :
518 : }
519 0 : if (++quad_count >= (64/4))
520 : {
521 0 : es_fputs (LF, stream);
522 0 : quad_count = 0;
523 : }
524 : }
525 :
526 0 : if (quad_count)
527 0 : es_fputs (LF, stream);
528 :
529 0 : if (parm->pem_name)
530 : {
531 0 : es_fputs ("-----END ", stream);
532 0 : es_fputs (parm->pem_name, stream);
533 0 : es_fputs ("-----\n", stream);
534 : }
535 :
536 0 : return es_ferror (stream)? gpg_error_from_syserror () : 0;
537 : }
538 :
539 :
540 :
541 :
542 : /* Create a reader for the given file descriptor. Depending on the
543 : control information an input decoding is automagically choosen.
544 : The function returns a Base64Context object which must be passed to
545 : the gpgme_destroy_reader function. The created KsbaReader object
546 : is also returned, but the caller must not call the
547 : ksba_reader_release function on. If ALLOW_MULTI_PEM is true, the
548 : reader expects that the caller uses ksba_reader_clear after EOF
549 : until no more objects were found. */
550 : int
551 3 : gpgsm_create_reader (Base64Context *ctx,
552 : ctrl_t ctrl, estream_t fp, int allow_multi_pem,
553 : ksba_reader_t *r_reader)
554 : {
555 : int rc;
556 : ksba_reader_t r;
557 :
558 3 : *r_reader = NULL;
559 3 : *ctx = xtrycalloc (1, sizeof **ctx);
560 3 : if (!*ctx)
561 0 : return out_of_core ();
562 3 : (*ctx)->u.rparm.allow_multi_pem = allow_multi_pem;
563 :
564 3 : rc = ksba_reader_new (&r);
565 3 : if (rc)
566 : {
567 0 : xfree (*ctx); *ctx = NULL;
568 0 : return rc;
569 : }
570 :
571 3 : (*ctx)->u.rparm.fp = fp;
572 3 : if (ctrl->is_pem)
573 : {
574 0 : (*ctx)->u.rparm.assume_pem = 1;
575 0 : (*ctx)->u.rparm.assume_base64 = 1;
576 0 : rc = ksba_reader_set_cb (r, base64_reader_cb, &(*ctx)->u.rparm);
577 : }
578 3 : else if (ctrl->is_base64)
579 : {
580 0 : (*ctx)->u.rparm.assume_base64 = 1;
581 0 : rc = ksba_reader_set_cb (r, base64_reader_cb, &(*ctx)->u.rparm);
582 : }
583 3 : else if (ctrl->autodetect_encoding)
584 : {
585 3 : (*ctx)->u.rparm.autodetect = 1;
586 3 : rc = ksba_reader_set_cb (r, base64_reader_cb, &(*ctx)->u.rparm);
587 : }
588 : else
589 0 : rc = ksba_reader_set_cb (r, simple_reader_cb, &(*ctx)->u.rparm);
590 :
591 3 : if (rc)
592 : {
593 0 : ksba_reader_release (r);
594 0 : xfree (*ctx); *ctx = NULL;
595 0 : return rc;
596 : }
597 :
598 3 : (*ctx)->u2.reader = r;
599 3 : *r_reader = r;
600 3 : return 0;
601 : }
602 :
603 :
604 : int
605 3 : gpgsm_reader_eof_seen (Base64Context ctx)
606 : {
607 3 : return ctx && ctx->u.rparm.eof_seen;
608 : }
609 :
610 : void
611 3 : gpgsm_destroy_reader (Base64Context ctx)
612 : {
613 3 : if (!ctx)
614 3 : return;
615 :
616 3 : ksba_reader_release (ctx->u2.reader);
617 3 : xfree (ctx);
618 : }
619 :
620 :
621 :
622 : /* Create a writer for the given STREAM. Depending on
623 : the control information an output encoding is automagically
624 : choosen. The function returns a Base64Context object which must be
625 : passed to the gpgme_destroy_writer function. The created
626 : KsbaWriter object is also returned, but the caller must not call
627 : the ksba_reader_release function on it. */
628 : int
629 0 : gpgsm_create_writer (Base64Context *ctx, ctrl_t ctrl, estream_t stream,
630 : ksba_writer_t *r_writer)
631 : {
632 : int rc;
633 : ksba_writer_t w;
634 :
635 0 : *r_writer = NULL;
636 0 : *ctx = xtrycalloc (1, sizeof **ctx);
637 0 : if (!*ctx)
638 0 : return out_of_core ();
639 :
640 0 : rc = ksba_writer_new (&w);
641 0 : if (rc)
642 : {
643 0 : xfree (*ctx); *ctx = NULL;
644 0 : return rc;
645 : }
646 :
647 0 : if (ctrl->create_pem || ctrl->create_base64)
648 : {
649 0 : (*ctx)->u.wparm.stream = stream;
650 0 : if (ctrl->create_pem)
651 0 : (*ctx)->u.wparm.pem_name = ctrl->pem_name? ctrl->pem_name
652 0 : : "CMS OBJECT";
653 0 : rc = ksba_writer_set_cb (w, base64_writer_cb, &(*ctx)->u.wparm);
654 : }
655 0 : else if (stream)
656 : {
657 0 : (*ctx)->u.wparm.stream = stream;
658 0 : rc = ksba_writer_set_cb (w, plain_writer_cb, &(*ctx)->u.wparm);
659 : }
660 : else
661 0 : rc = gpg_error (GPG_ERR_INV_ARG);
662 :
663 0 : if (rc)
664 : {
665 0 : ksba_writer_release (w);
666 0 : xfree (*ctx); *ctx = NULL;
667 0 : return rc;
668 : }
669 :
670 0 : (*ctx)->u2.writer = w;
671 0 : *r_writer = w;
672 0 : return 0;
673 : }
674 :
675 :
676 : int
677 0 : gpgsm_finish_writer (Base64Context ctx)
678 : {
679 : struct writer_cb_parm_s *parm;
680 :
681 0 : if (!ctx)
682 0 : return gpg_error (GPG_ERR_INV_VALUE);
683 0 : parm = &ctx->u.wparm;
684 0 : if (parm->did_finish)
685 0 : return 0; /* Already done. */
686 0 : parm->did_finish = 1;
687 0 : if (!parm->stream)
688 0 : return 0; /* Callback was not used. */
689 0 : return base64_finish_write (parm);
690 : }
691 :
692 : void
693 0 : gpgsm_destroy_writer (Base64Context ctx)
694 : {
695 0 : if (!ctx)
696 0 : return;
697 :
698 0 : ksba_writer_release (ctx->u2.writer);
699 0 : xfree (ctx);
700 : }
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