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/*
* Copyright (C) 2003, 2005 Philip Blundell <philb@gnu.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <glib.h>
#include "crypt.h"
#include "keygen.h"
static struct rsa_key private_key;
static u_int32_t key_id;
gchar *
sign_challenge (gchar *text, int length, gchar *target)
{
char hash[20];
gchar *sig, *result;
memset (hash, 0, sizeof (hash));
displaymigration_crypt_create_hash (target, text, length, hash);
if (displaymigration_crypt_sign_hash (&private_key, hash, &sig) == FALSE)
return NULL;
result = g_strdup_printf ("%08x %s", key_id, sig);
g_free (sig);
return result;
}
static gboolean
parse_key (char *s, struct rsa_key *r)
{
gcry_mpi_t n, e, d, p, q, u;
char *sp;
sp = strtok (s, " \n");
key_id = strtoul (sp, NULL, 16);
sp = strtok (NULL, " \n");
gcry_mpi_scan (&e, GCRYMPI_FMT_HEX, sp, 0, NULL);
sp = strtok (NULL, " \n");
gcry_mpi_scan (&d, GCRYMPI_FMT_HEX, sp, 0, NULL);
sp = strtok (NULL, " \n");
gcry_mpi_scan (&n, GCRYMPI_FMT_HEX, sp, 0, NULL);
sp = strtok (NULL, " \n");
gcry_mpi_scan (&p, GCRYMPI_FMT_HEX, sp, 0, NULL);
sp = strtok (NULL, " \n");
gcry_mpi_scan (&q, GCRYMPI_FMT_HEX, sp, 0, NULL);
sp = strtok (NULL, " \n");
gcry_mpi_scan (&u, GCRYMPI_FMT_HEX, sp, 0, NULL);
r->e = e;
r->d = d;
r->n = n;
r->p = p;
r->q = q;
r->u = u;
return TRUE;
}
void
crypt_init (void)
{
gchar *filename;
FILE *fp;
gboolean key_found = FALSE;
gcry_control (GCRYCTL_INIT_SECMEM, 1);
gcry_check_version (NULL);
memset (&private_key, 0, sizeof (private_key));
home_dir = g_get_home_dir ();
filename = g_strdup_printf ("%s/.gpe/migrate/secret", home_dir);
fp = fopen (filename, "r");
if (fp)
{
char buffer[4096];
if (fgets (buffer, 4096, fp) && parse_key (buffer, &private_key))
key_found = TRUE;
fclose (fp);
}
g_free (filename);
if (! key_found)
{
generate_key (&private_key);
write_public (&private_key);
write_secret (&private_key);
key_id = private_key_id (&private_key);
}
}
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