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/* fp_mul_comba_3.i
*
* Copyright (C) 2006-2015 wolfSSL Inc.
*
* This file is part of wolfSSL. (formerly known as CyaSSL)
*
* wolfSSL 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.
*
* wolfSSL 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifdef TFM_MUL3
void fp_mul_comba3(fp_int *A, fp_int *B, fp_int *C)
{
fp_digit c0, c1, c2, at[6];
memcpy(at, A->dp, 3 * sizeof(fp_digit));
memcpy(at+3, B->dp, 3 * sizeof(fp_digit));
COMBA_START;
COMBA_CLEAR;
/* 0 */
MULADD(at[0], at[3]);
COMBA_STORE(C->dp[0]);
/* 1 */
COMBA_FORWARD;
MULADD(at[0], at[4]); MULADD(at[1], at[3]);
COMBA_STORE(C->dp[1]);
/* 2 */
COMBA_FORWARD;
MULADD(at[0], at[5]); MULADD(at[1], at[4]); MULADD(at[2], at[3]);
COMBA_STORE(C->dp[2]);
/* 3 */
COMBA_FORWARD;
MULADD(at[1], at[5]); MULADD(at[2], at[4]);
COMBA_STORE(C->dp[3]);
/* 4 */
COMBA_FORWARD;
MULADD(at[2], at[5]);
COMBA_STORE(C->dp[4]);
COMBA_STORE2(C->dp[5]);
C->used = 6;
C->sign = A->sign ^ B->sign;
fp_clamp(C);
COMBA_FINI;
}
#endif