mirror of
git://git.gnupg.org/gnupg.git
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944fee70bc
of direct creation of ksba_reader/writer. * gpgsm.c (main): Set ctrl.auto_encoding unless --no-armor is used. This way we can feed PEM encoded stuff to --verify.
402 lines
10 KiB
C
402 lines
10 KiB
C
/* base64.c
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* Copyright (C) 2001 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <time.h>
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#include <assert.h>
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#include <ksba.h>
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#include "gpgsm.h"
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#include "i18n.h"
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/* data used by the reader callbacks */
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struct reader_cb_parm_s {
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FILE *fp;
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unsigned char line[1024];
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int linelen;
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int readpos;
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int have_lf;
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unsigned long line_counter;
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int autodetect; /* try to detect the input encoding */
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int assume_pem; /* assume input encoding is PEM */
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int assume_base64; /* assume inpout is base64 encoded */
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int identified;
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int is_pem;
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int stop_seen;
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struct {
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int idx;
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unsigned char val;
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int stop_seen;
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} base64;
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};
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struct base64_context_s {
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struct reader_cb_parm_s rparm;
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};
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/* The base-64 character list */
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static unsigned char bintoasc[64] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/";
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/* The reverse base-64 list */
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static unsigned char asctobin[256] = {
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
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0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
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0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12,
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0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24,
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0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
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0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff
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};
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static int
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base64_reader_cb (void *cb_value, char *buffer, size_t count, size_t *nread)
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{
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struct reader_cb_parm_s *parm = cb_value;
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size_t n;
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int c, c2;
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*nread = 0;
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if (!buffer)
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return -1; /* not supported */
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next:
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if (!parm->linelen)
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{
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/* read an entire line or up to the size of the buffer */
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parm->line_counter++;
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parm->have_lf = 0;
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for (n=0; n < DIM(parm->line);)
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{
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c = getc (parm->fp);
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if (c == EOF)
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{
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if (ferror (parm->fp))
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return -1;
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break;
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}
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parm->line[n++] = c;
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if (c == '\n')
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{
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parm->have_lf = 1;
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/* FIXME: we need to skip overlong lines while detecting
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the dashed lines */
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break;
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}
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}
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parm->linelen = n;
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if (!n)
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return -1; /* eof */
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parm->readpos = 0;
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}
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if (!parm->identified)
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{
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if (parm->line_counter == 1 && !parm->have_lf)
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{
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/* first line too long - assume DER encoding */
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parm->is_pem = 0;
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}
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else if (parm->line_counter == 1 && parm->linelen && *parm->line == 0x30)
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{
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/* the very first bytes does pretty much look like a SEQUENCE tag*/
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parm->is_pem = 0;
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}
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else if ( parm->have_lf && !strncmp (parm->line, "-----BEGIN ", 11)
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&& strncmp (parm->line+11, "PGP ", 4) )
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{
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/* Fixme: we must only compare if the line really starts at
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the beginning */
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parm->is_pem = 1;
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parm->linelen = parm->readpos = 0;
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}
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else
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{
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parm->linelen = parm->readpos = 0;
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goto next;
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}
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parm->identified = 1;
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parm->base64.stop_seen = 0;
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parm->base64.idx = 0;
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}
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n = 0;
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if (parm->is_pem)
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{
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if (parm->have_lf && !strncmp (parm->line, "-----END ", 9))
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{
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parm->identified = 0;
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parm->linelen = parm->readpos = 0;
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/* let us return 0 */
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}
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else if (parm->stop_seen)
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{ /* skip the rest of the line */
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parm->linelen = parm->readpos = 0;
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}
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else
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{
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int idx = parm->base64.idx;
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unsigned char val = parm->base64.val;
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while (n < count && parm->readpos < parm->linelen )
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{
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c = parm->line[parm->readpos++];
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if (c == '\n' || c == ' ' || c == '\r' || c == '\t')
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continue;
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if (c == '=')
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{ /* pad character: stop */
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if (idx == 1)
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buffer[n++] = val;
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parm->stop_seen = 1;
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break;
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}
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if( (c = asctobin[(c2=c)]) == 255 )
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{
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log_error (_("invalid radix64 character %02x skipped\n"),
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c2);
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continue;
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}
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switch (idx)
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{
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case 0:
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val = c << 2;
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break;
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case 1:
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val |= (c>>4)&3;
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buffer[n++] = val;
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val = (c<<4)&0xf0;
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break;
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case 2:
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val |= (c>>2)&15;
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buffer[n++] = val;
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val = (c<<6)&0xc0;
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break;
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case 3:
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val |= c&0x3f;
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buffer[n++] = val;
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break;
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}
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idx = (idx+1) % 4;
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}
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if (parm->readpos == parm->linelen)
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parm->linelen = parm->readpos = 0;
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parm->base64.idx = idx;
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parm->base64.val = val;
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}
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}
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else
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{ /* DER encoded */
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while (n < count && parm->readpos < parm->linelen)
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buffer[n++] = parm->line[parm->readpos++];
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if (parm->readpos == parm->linelen)
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parm->linelen = parm->readpos = 0;
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}
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*nread = n;
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return 0;
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}
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static int
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simple_reader_cb (void *cb_value, char *buffer, size_t count, size_t *nread)
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{
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struct reader_cb_parm_s *parm = cb_value;
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size_t n;
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int c = 0;
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*nread = 0;
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if (!buffer)
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return -1; /* not supported */
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for (n=0; n < count; n++)
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{
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c = getc (parm->fp);
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if (c == EOF)
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{
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if ( ferror (parm->fp) )
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return -1;
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if (n)
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break; /* return what we have before an EOF */
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return -1;
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}
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*(byte *)buffer++ = c;
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}
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*nread = n;
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return 0;
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}
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/* Create a reader for the given file descriptor. Depending on the
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control information an input decoding is automagically choosen.
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The function returns a Base64Context object which must be passed to
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the gpgme_destroy_reader function. The created KsbaReader object
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is also returned, but the caller must not call the
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ksba_reader_release function on. */
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int
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gpgsm_create_reader (Base64Context *ctx,
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CTRL ctrl, FILE *fp, KsbaReader *r_reader)
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{
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int rc;
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KsbaReader r;
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*r_reader = NULL;
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*ctx = xtrycalloc (1, sizeof **ctx);
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if (!*ctx)
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return seterr (Out_Of_Core);
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r = ksba_reader_new ();
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if (!r)
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{
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xfree (*ctx); *ctx = NULL;
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return seterr (Out_Of_Core);
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}
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(*ctx)->rparm.fp = fp;
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if (ctrl->is_pem)
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{
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(*ctx)->rparm.assume_pem = 1;
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(*ctx)->rparm.assume_base64 = 1;
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rc = ksba_reader_set_cb (r, base64_reader_cb, &(*ctx)->rparm);
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}
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else if (ctrl->is_base64)
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{
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(*ctx)->rparm.assume_base64 = 1;
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rc = ksba_reader_set_cb (r, base64_reader_cb, &(*ctx)->rparm);
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}
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else if (ctrl->autodetect_encoding)
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{
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(*ctx)->rparm.autodetect = 1;
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rc = ksba_reader_set_cb (r, base64_reader_cb, &(*ctx)->rparm);
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}
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else
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rc = ksba_reader_set_cb (r, simple_reader_cb, &(*ctx)->rparm);
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if (rc)
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{
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ksba_reader_release (r);
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xfree (*ctx); *ctx = NULL;
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return map_ksba_err (rc);
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}
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*r_reader = r;
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return 0;
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}
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void
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gpgsm_destroy_reader (Base64Context ctx)
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{
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xfree (ctx);
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}
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/* Create a writer for the given stream. Depending on the control
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information an output encoding is automagically choosen. The
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function returns a Base64Context object which must be passed to the
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gpgme_destroy_writer function. The created KsbaWriter object is
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also returned, but the caller must not call the ksba_reader_release
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function on. */
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int
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gpgsm_create_writer (Base64Context *ctx,
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CTRL ctrl, FILE *fp, KsbaWriter *r_writer)
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{
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int rc;
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KsbaWriter w;
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*r_writer = NULL;
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*ctx = xtrycalloc (1, sizeof **ctx);
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if (!*ctx)
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return seterr (Out_Of_Core);
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w = ksba_writer_new ();
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if (!w)
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{
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xfree (*ctx); *ctx = NULL;
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return seterr (Out_Of_Core);
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}
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if (ctrl->create_pem || ctrl->create_base64)
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{
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return seterr (Not_Implemented);
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}
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else
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rc = ksba_writer_set_file (w, fp);
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if (rc)
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{
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ksba_writer_release (w);
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xfree (*ctx); *ctx = NULL;
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return map_ksba_err (rc);
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}
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*r_writer = w;
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return 0;
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}
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void
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gpgsm_destroy_writer (Base64Context ctx)
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{
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xfree (ctx);
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}
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