93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
/**
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* @file ecc_export.c
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* @version $Format:%h%d$
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*
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* Functions for exporting ECC public keys over-the-wire using
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* Matrix Crypto.
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*/
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/*
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* Copyright (c) 2013-2018 INSIDE Secure Corporation
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* Copyright (c) PeerSec Networks, 2002-2011
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* All Rights Reserved
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*
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* The latest version of this code is available at http://www.matrixssl.org
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*
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* This software is open source; 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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* This General Public License does NOT permit incorporating this software
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* into proprietary programs. If you are unable to comply with the GPL, a
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* commercial license for this software may be purchased from INSIDE at
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* http://www.insidesecure.com/
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*
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* This program is distributed in WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the 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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* http://www.gnu.org/copyleft/gpl.html
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*/
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/******************************************************************************/
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#include "../cryptoImpl.h"
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#ifdef USE_MATRIX_ECC
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/******************************************************************************/
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# define ECC_BUF_SIZE 256
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/******************************************************************************/
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/**
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ANSI X9.62 or X9.63 (Sec. 4.3.6) uncompressed export.
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@param[in] pool Memory pool
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@param[in] key Key to export
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@param[out] out [out] destination of export
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@param[in, out] outlen Length of destination and final output size
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@return PS_SUCCESS on success, < 0 on failure
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*/
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int32_t psEccX963ExportKey(psPool_t *pool, const psEccKey_t *key,
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unsigned char *out, psSize_t *outlen)
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{
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unsigned char buf[ECC_BUF_SIZE];
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unsigned long numlen;
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int32_t res;
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numlen = key->curve->size;
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if (*outlen < (1 + 2 * numlen))
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{
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*outlen = 1 + 2 * numlen;
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return PS_LIMIT_FAIL;
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}
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out[0] = (unsigned char) ANSI_UNCOMPRESSED;
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/* pad and store x */
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Memset(buf, 0, sizeof(buf));
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if ((res = pstm_to_unsigned_bin(pool, &key->pubkey.x, buf +
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(numlen - pstm_unsigned_bin_size(&key->pubkey.x)))) != PSTM_OKAY)
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{
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return res;
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}
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Memcpy(out + 1, buf, numlen);
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/* pad and store y */
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Memset(buf, 0, sizeof(buf));
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if ((res = pstm_to_unsigned_bin(pool, &key->pubkey.y, buf +
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(numlen - pstm_unsigned_bin_size(&key->pubkey.y)))) != PSTM_OKAY)
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{
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return res;
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}
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Memcpy(out + 1 + numlen, buf, numlen);
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*outlen = 1 + 2 * numlen;
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return PS_SUCCESS;
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}
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#endif /* USE_MATRIX_ECC */
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