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/*
* Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation
*
* Author: 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(mpi_t * x)
{
if (*x == NULL)
return;
gcry_mpi_release(*x);
*x = NULL;
}
/* returns zero on success
*/
int _gnutls_mpi_scan(mpi_t * 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(mpi_t * 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(void *buffer, size_t * nbytes, const mpi_t a)
{
int ret;
if (nbytes == NULL || a == NULL)
return GNUTLS_E_INVALID_REQUEST;
ret = gcry_mpi_print(GCRYMPI_FMT_USG, buffer, *nbytes, nbytes, a);
if (!ret)
return 0;
return GNUTLS_E_MPI_PRINT_FAILED;
}
/* Always has the first bit zero */
int _gnutls_mpi_print_lz(void *buffer, size_t * nbytes, const mpi_t a)
{
int ret;
if (nbytes == NULL || a == NULL)
return GNUTLS_E_INVALID_REQUEST;
ret = gcry_mpi_print(GCRYMPI_FMT_STD, buffer, *nbytes, nbytes, a);
if (!ret)
return 0;
return GNUTLS_E_MPI_PRINT_FAILED;
}
/* Always has the first bit zero */
int _gnutls_mpi_dprint_lz(gnutls_datum_t * dest, const mpi_t a)
{
int ret;
opaque *buf = NULL;
size_t bytes = 0;
if (dest == NULL || a == NULL)
return GNUTLS_E_INVALID_REQUEST;
gcry_mpi_print(GCRYMPI_FMT_STD, NULL, 0, &bytes, a);
if (bytes != 0)
buf = gnutls_malloc(bytes);
if (buf == NULL)
return GNUTLS_E_MEMORY_ERROR;
ret = gcry_mpi_print(GCRYMPI_FMT_STD, buf, bytes, &bytes, a);
if (!ret) {
dest->data = buf;
dest->size = bytes;
return 0;
}
gnutls_free(buf);
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,
mpi_t * 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, mpi_t 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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