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/*
* Copyright (C) 2001,2002,2003 Nikos Mavroyanopoulos
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/* Here lie everything that has to do with large numbers, libgcrypt and
* other stuff that didn't fit anywhere else.
*/
#include <gnutls_int.h>
#include <libtasn1.h>
#include <gnutls_errors.h>
#include <gnutls_num.h>
/* Functions that refer to the libgcrypt library.
*/
void _gnutls_mpi_release( GNUTLS_MPI* x) {
if (*x==NULL) return;
gcry_mpi_release(*x);
*x=NULL;
}
/* returns zero on success
*/
int _gnutls_mpi_scan( GNUTLS_MPI *ret_mpi, const opaque *buffer, size_t *nbytes ) {
int ret;
ret = gcry_mpi_scan( ret_mpi, GCRYMPI_FMT_USG, buffer, *nbytes, nbytes);
if (ret) return GNUTLS_E_MPI_SCAN_FAILED;
/* MPIs with 0 bits are illegal
*/
if (_gnutls_mpi_get_nbits( *ret_mpi) == 0) {
_gnutls_mpi_release( ret_mpi);
return GNUTLS_E_MPI_SCAN_FAILED;
}
return 0;
}
int _gnutls_mpi_scan_pgp( GNUTLS_MPI *ret_mpi, const opaque *buffer, size_t *nbytes)
{
int ret;
ret = gcry_mpi_scan( ret_mpi, GCRYMPI_FMT_PGP, buffer, *nbytes, nbytes);
if (ret) return GNUTLS_E_MPI_SCAN_FAILED;
/* MPIs with 0 bits are illegal
*/
if (_gnutls_mpi_get_nbits( *ret_mpi) == 0) {
_gnutls_mpi_release( ret_mpi);
return GNUTLS_E_MPI_SCAN_FAILED;
}
return 0;
}
int _gnutls_mpi_print( opaque *buffer, size_t *nbytes, const GNUTLS_MPI a )
{
int ret;
ret = gcry_mpi_print( GCRYMPI_FMT_USG, buffer, *nbytes, nbytes, a);
if (!ret) return ret;
return GNUTLS_E_MPI_PRINT_FAILED;
}
/* Always has the first bit zero */
int _gnutls_mpi_print_lz( opaque *buffer, size_t *nbytes, const GNUTLS_MPI a )
{
int ret;
ret = gcry_mpi_print( GCRYMPI_FMT_STD, buffer, *nbytes, nbytes, a);
if (!ret) return ret;
return GNUTLS_E_MPI_PRINT_FAILED;
}
/* this function reads an integer
* from asn1 structs. Combines the read and mpi_scan
* steps.
*/
int _gnutls_x509_read_int( ASN1_TYPE node, const char* value,
GNUTLS_MPI* ret_mpi)
{
int result;
size_t s_len;
opaque* tmpstr = NULL;
int tmpstr_size;
tmpstr_size = 0;
result = asn1_read_value( node, value, NULL, &tmpstr_size);
if (result != ASN1_MEM_ERROR) {
gnutls_assert();
return _gnutls_asn2err(result);
}
tmpstr = gnutls_alloca( tmpstr_size);
if (tmpstr == NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
result = asn1_read_value( node, value, tmpstr, &tmpstr_size);
if (result != ASN1_SUCCESS) {
gnutls_assert();
gnutls_afree( tmpstr);
return _gnutls_asn2err(result);
}
s_len = tmpstr_size;
if (_gnutls_mpi_scan( ret_mpi, tmpstr, &s_len) != 0) {
gnutls_assert();
gnutls_afree( tmpstr);
return GNUTLS_E_MPI_SCAN_FAILED;
}
gnutls_afree( tmpstr);
return 0;
}
/* Writes the specified integer into the specified node.
*/
int _gnutls_x509_write_int( ASN1_TYPE node, const char* value, GNUTLS_MPI mpi, int lz)
{
opaque *tmpstr;
size_t s_len;
int result;
s_len = 0;
if (lz) result = _gnutls_mpi_print_lz( NULL, &s_len, mpi);
else result = _gnutls_mpi_print( NULL, &s_len, mpi);
tmpstr = gnutls_alloca( s_len);
if (tmpstr == NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
if (lz) result = _gnutls_mpi_print_lz( tmpstr, &s_len, mpi);
else result = _gnutls_mpi_print( tmpstr, &s_len, mpi);
if (result != 0) {
gnutls_assert();
gnutls_afree( tmpstr);
return GNUTLS_E_MPI_PRINT_FAILED;
}
result = asn1_write_value( node, value, tmpstr, s_len);
gnutls_afree( tmpstr);
if (result != ASN1_SUCCESS) {
gnutls_assert();
return _gnutls_asn2err(result);
}
return 0;
}
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