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- /* fp_sqr_comba_4.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_SQR4
- int fp_sqr_comba4(fp_int *A, fp_int *B)
- {
- fp_digit *a, c0, c1, c2;
- #ifdef TFM_ISO
- fp_word tt;
- #endif
- #ifndef WOLFSSL_SMALL_STACK
- fp_digit b[8];
- #else
- fp_digit *b;
- #endif
- #ifdef WOLFSSL_SMALL_STACK
- b = (fp_digit*)XMALLOC(sizeof(fp_digit) * 8, 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[1], a[3]); SQRADD(a[2], a[2]);
- COMBA_STORE(b[4]);
- /* output 5 */
- CARRY_FORWARD;
- SQRADD2(a[2], a[3]);
- COMBA_STORE(b[5]);
- /* output 6 */
- CARRY_FORWARD;
- SQRADD(a[3], a[3]);
- COMBA_STORE(b[6]);
- COMBA_STORE2(b[7]);
- COMBA_FINI;
- B->used = 8;
- B->sign = FP_ZPOS;
- XMEMCPY(B->dp, b, 8 * 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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