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/* fp_mul_comba_8.i
*
* Copyright (C) 2006-2020 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* 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 02110-1335, USA
*/
#ifdef TFM_MUL8
int fp_mul_comba8(fp_int *A, fp_int *B, fp_int *C)
{
fp_digit c0, c1, c2;
#ifndef WOLFSSL_SMALL_STACK
fp_digit at[16];
#else
fp_digit *at;
#endif
#ifdef WOLFSSL_SMALL_STACK
at = (fp_digit*)XMALLOC(sizeof(fp_digit) * 16, NULL, DYNAMIC_TYPE_TMP_BUFFER);
if (at == NULL)
return FP_MEM;
#endif
XMEMCPY(at, A->dp, 8 * sizeof(fp_digit));
XMEMCPY(at+8, B->dp, 8 * sizeof(fp_digit));
COMBA_START;
COMBA_CLEAR;
/* 0 */
MULADD(at[0], at[8]);
COMBA_STORE(C->dp[0]);
/* 1 */
COMBA_FORWARD;
MULADD(at[0], at[9]); MULADD(at[1], at[8]);
COMBA_STORE(C->dp[1]);
/* 2 */
COMBA_FORWARD;
MULADD(at[0], at[10]); MULADD(at[1], at[9]); MULADD(at[2], at[8]);
COMBA_STORE(C->dp[2]);
/* 3 */
COMBA_FORWARD;
MULADD(at[0], at[11]); MULADD(at[1], at[10]); MULADD(at[2], at[9]); MULADD(at[3], at[8]);
COMBA_STORE(C->dp[3]);
/* 4 */
COMBA_FORWARD;
MULADD(at[0], at[12]); MULADD(at[1], at[11]); MULADD(at[2], at[10]); MULADD(at[3], at[9]); MULADD(at[4], at[8]);
COMBA_STORE(C->dp[4]);
/* 5 */
COMBA_FORWARD;
MULADD(at[0], at[13]); MULADD(at[1], at[12]); MULADD(at[2], at[11]); MULADD(at[3], at[10]); MULADD(at[4], at[9]); MULADD(at[5], at[8]);
COMBA_STORE(C->dp[5]);
/* 6 */
COMBA_FORWARD;
MULADD(at[0], at[14]); MULADD(at[1], at[13]); MULADD(at[2], at[12]); MULADD(at[3], at[11]); MULADD(at[4], at[10]); MULADD(at[5], at[9]); MULADD(at[6], at[8]);
COMBA_STORE(C->dp[6]);
/* 7 */
COMBA_FORWARD;
MULADD(at[0], at[15]); MULADD(at[1], at[14]); MULADD(at[2], at[13]); MULADD(at[3], at[12]); MULADD(at[4], at[11]); MULADD(at[5], at[10]); MULADD(at[6], at[9]); MULADD(at[7], at[8]);
COMBA_STORE(C->dp[7]);
/* 8 */
COMBA_FORWARD;
MULADD(at[1], at[15]); MULADD(at[2], at[14]); MULADD(at[3], at[13]); MULADD(at[4], at[12]); MULADD(at[5], at[11]); MULADD(at[6], at[10]); MULADD(at[7], at[9]);
COMBA_STORE(C->dp[8]);
/* 9 */
COMBA_FORWARD;
MULADD(at[2], at[15]); MULADD(at[3], at[14]); MULADD(at[4], at[13]); MULADD(at[5], at[12]); MULADD(at[6], at[11]); MULADD(at[7], at[10]);
COMBA_STORE(C->dp[9]);
/* 10 */
COMBA_FORWARD;
MULADD(at[3], at[15]); MULADD(at[4], at[14]); MULADD(at[5], at[13]); MULADD(at[6], at[12]); MULADD(at[7], at[11]);
COMBA_STORE(C->dp[10]);
/* 11 */
COMBA_FORWARD;
MULADD(at[4], at[15]); MULADD(at[5], at[14]); MULADD(at[6], at[13]); MULADD(at[7], at[12]);
COMBA_STORE(C->dp[11]);
/* 12 */
COMBA_FORWARD;
MULADD(at[5], at[15]); MULADD(at[6], at[14]); MULADD(at[7], at[13]);
COMBA_STORE(C->dp[12]);
/* 13 */
COMBA_FORWARD;
MULADD(at[6], at[15]); MULADD(at[7], at[14]);
COMBA_STORE(C->dp[13]);
/* 14 */
COMBA_FORWARD;
MULADD(at[7], at[15]);
COMBA_STORE(C->dp[14]);
COMBA_STORE2(C->dp[15]);
C->used = 16;
C->sign = A->sign ^ B->sign;
fp_clamp(C);
COMBA_FINI;
#ifdef WOLFSSL_SMALL_STACK
XFREE(at, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return FP_OKAY;
}
#endif
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