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/* minip12.c - A mini pkcs-12 implementation (modified for gnutls)
*
* Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.
*
* This file is part of GNUTLS.
*
* The GNUTLS library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
#include <gnutls_int.h>
#ifdef ENABLE_PKI
#include <gcrypt.h>
#include <gc.h>
#include <gnutls_errors.h>
/* Returns 0 if the password is ok, or a negative error
* code instead.
*/
static int
MHD_pkcs12_check_pass (const char *pass, size_t plen)
{
const char *p = pass;
unsigned int i;
for (i = 0; i < plen; i++)
{
if (isascii (p[i]))
continue;
return GNUTLS_E_INVALID_PASSWORD;
}
return 0;
}
/* ID should be:
* 3 for MAC
* 2 for IV
* 1 for encryption key
*/
int
MHD_pkcs12_string_to_key (unsigned int id, const opaque * salt,
unsigned int salt_size, unsigned int iter,
const char *pw, unsigned int req_keylen,
opaque * keybuf)
{
int rc;
unsigned int i, j;
MHD_gc_hash_handle md;
mpi_t num_b1 = NULL;
unsigned int pwlen;
opaque hash[20], buf_b[64], buf_i[128], *p;
size_t cur_keylen;
size_t n;
cur_keylen = 0;
if (pw == NULL)
pwlen = 0;
else
pwlen = strlen (pw);
if (pwlen > 63 / 2)
{
MHD_gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
if ((rc = MHD_pkcs12_check_pass (pw, pwlen)) < 0)
{
MHD_gnutls_assert ();
return rc;
}
/* Store salt and password in BUF_I */
p = buf_i;
for (i = 0; i < 64; i++)
*p++ = salt[i % salt_size];
if (pw)
{
for (i = j = 0; i < 64; i += 2)
{
*p++ = 0;
*p++ = pw[j];
if (++j > pwlen) /* Note, that we include the trailing zero */
j = 0;
}
}
else
memset (p, 0, 64);
for (;;)
{
rc = MHD_gc_hash_open (GC_SHA1, 0, &md);
if (rc)
{
MHD_gnutls_assert ();
return GNUTLS_E_DECRYPTION_FAILED;
}
for (i = 0; i < 64; i++)
{
unsigned char lid = id & 0xFF;
MHD_gc_hash_write (md, 1, (const char *) &lid);
}
MHD_gc_hash_write (md, pw ? 128 : 64, (const char *) buf_i);
memcpy (hash, MHD_gc_hash_read (md), 20);
MHD_gc_hash_close (md);
for (i = 1; i < iter; i++)
MHD_gc_hash_buffer (GC_SHA1, hash, 20, (char *) hash);
for (i = 0; i < 20 && cur_keylen < req_keylen; i++)
keybuf[cur_keylen++] = hash[i];
if (cur_keylen == req_keylen)
{
gcry_mpi_release (num_b1);
return 0; /* ready */
}
/* need more bytes. */
for (i = 0; i < 64; i++)
buf_b[i] = hash[i % 20];
n = 64;
rc = MHD_gtls_mpi_scan (&num_b1, buf_b, &n);
if (rc < 0)
{
MHD_gnutls_assert ();
return rc;
}
gcry_mpi_add_ui (num_b1, num_b1, 1);
for (i = 0; i < 128; i += 64)
{
mpi_t num_ij;
n = 64;
rc = MHD_gtls_mpi_scan (&num_ij, buf_i + i, &n);
if (rc < 0)
{
MHD_gnutls_assert ();
return rc;
}
gcry_mpi_add (num_ij, num_ij, num_b1);
gcry_mpi_clear_highbit (num_ij, 64 * 8);
n = 64;
rc = MHD_gtls_mpi_print (buf_i + i, &n, num_ij);
if (rc < 0)
{
MHD_gnutls_assert ();
return rc;
}
gcry_mpi_release (num_ij);
}
}
}
#endif /* ENABLE_PKI */
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