mirror of git://git.gnupg.org/gnupg.git
92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
/* findkey.c - locate the secret key
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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 <errno.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 <ctype.h>
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#include <assert.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include "agent.h"
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/* Return the secret key as an S-Exp after locating it using the grip. Returns NULL if key is not available. */
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GCRY_SEXP
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agent_key_from_file (const unsigned char *grip)
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{
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int i, rc;
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char *fname;
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FILE *fp;
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struct stat st;
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char *buf;
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size_t buflen, erroff;
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GCRY_SEXP s_skey;
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char hexgrip[41];
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for (i=0; i < 20; i++)
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sprintf (hexgrip+2*i, "%02X", grip[i]);
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hexgrip[40] = 0;
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fname = make_filename (opt.homedir, "private-keys-v1.d", hexgrip, NULL );
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fp = fopen (fname, "rb");
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if (!fp)
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{
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log_error ("can't open `%s': %s\n", fname, strerror (errno));
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xfree (fname);
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return NULL;
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}
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if (fstat (fileno(fp), &st))
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{
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log_error ("can't stat `%s': %s\n", fname, strerror (errno));
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xfree (fname);
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fclose (fp);
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return NULL;
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}
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buflen = st.st_size;
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buf = xmalloc (buflen+1);
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if (fread (buf, buflen, 1, fp) != 1)
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{
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log_error ("error reading `%s': %s\n", fname, strerror (errno));
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xfree (fname);
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fclose (fp);
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xfree (buf);
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return NULL;
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}
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rc = gcry_sexp_sscan (&s_skey, &erroff, buf, buflen);
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xfree (fname);
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fclose (fp);
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xfree (buf);
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if (rc)
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{
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log_error ("failed to build S-Exp (off=%u): %s\n",
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(unsigned int)erroff, gcry_strerror (rc));
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return NULL;
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}
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return s_skey;
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}
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