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/* fp_sqr_comba_7.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_SQR7
int fp_sqr_comba7(fp_int *A, fp_int *B)
{
fp_digit *a, c0, c1, c2, sc0 = 0, sc1 = 0, sc2 = 0;
#ifdef TFM_ISO
fp_word tt;
#endif
#ifndef WOLFSSL_SMALL_STACK
fp_digit b[14];
#else
fp_digit *b;
#endif
#ifdef WOLFSSL_SMALL_STACK
b = (fp_digit*)XMALLOC(sizeof(fp_digit) * 14, NULL, DYNAMIC_TYPE_TMP_BUFFER);
if (b == NULL)
return FP_MEM;
#endif
a = A->dp;
COMBA_START;
/* clear carries */
CLEAR_CARRY;
/* output 0 */
SQRADD(a[0],a[0]);
COMBA_STORE(b[0]);
/* output 1 */
CARRY_FORWARD;
SQRADD2(a[0], a[1]);
COMBA_STORE(b[1]);
/* output 2 */
CARRY_FORWARD;
SQRADD2(a[0], a[2]); SQRADD(a[1], a[1]);
COMBA_STORE(b[2]);
/* output 3 */
CARRY_FORWARD;
SQRADD2(a[0], a[3]); SQRADD2(a[1], a[2]);
COMBA_STORE(b[3]);
/* output 4 */
CARRY_FORWARD;
SQRADD2(a[0], a[4]); SQRADD2(a[1], a[3]); SQRADD(a[2], a[2]);
COMBA_STORE(b[4]);
/* output 5 */
CARRY_FORWARD;
SQRADDSC(a[0], a[5]); SQRADDAC(a[1], a[4]); SQRADDAC(a[2], a[3]); SQRADDDB;
COMBA_STORE(b[5]);
/* output 6 */
CARRY_FORWARD;
SQRADDSC(a[0], a[6]); SQRADDAC(a[1], a[5]); SQRADDAC(a[2], a[4]); SQRADDDB; SQRADD(a[3], a[3]);
COMBA_STORE(b[6]);
/* output 7 */
CARRY_FORWARD;
SQRADDSC(a[1], a[6]); SQRADDAC(a[2], a[5]); SQRADDAC(a[3], a[4]); SQRADDDB;
COMBA_STORE(b[7]);
/* output 8 */
CARRY_FORWARD;
SQRADD2(a[2], a[6]); SQRADD2(a[3], a[5]); SQRADD(a[4], a[4]);
COMBA_STORE(b[8]);
/* output 9 */
CARRY_FORWARD;
SQRADD2(a[3], a[6]); SQRADD2(a[4], a[5]);
COMBA_STORE(b[9]);
/* output 10 */
CARRY_FORWARD;
SQRADD2(a[4], a[6]); SQRADD(a[5], a[5]);
COMBA_STORE(b[10]);
/* output 11 */
CARRY_FORWARD;
SQRADD2(a[5], a[6]);
COMBA_STORE(b[11]);
/* output 12 */
CARRY_FORWARD;
SQRADD(a[6], a[6]);
COMBA_STORE(b[12]);
COMBA_STORE2(b[13]);
COMBA_FINI;
B->used = 14;
B->sign = FP_ZPOS;
XMEMCPY(B->dp, b, 14 * sizeof(fp_digit));
fp_clamp(B);
#ifdef WOLFSSL_SMALL_STACK
XFREE(b, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return FP_OKAY;
}
#endif
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