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- /* fp_mul_comba_9.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_MUL9
- int fp_mul_comba9(fp_int *A, fp_int *B, fp_int *C)
- {
- fp_digit c0, c1, c2;
- #ifndef WOLFSSL_SMALL_STACK
- fp_digit at[18];
- #else
- fp_digit *at;
- #endif
- #ifdef WOLFSSL_SMALL_STACK
- at = (fp_digit*)XMALLOC(sizeof(fp_digit) * 18, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- if (at == NULL)
- return FP_MEM;
- #endif
- XMEMCPY(at, A->dp, 9 * sizeof(fp_digit));
- XMEMCPY(at+9, B->dp, 9 * sizeof(fp_digit));
- COMBA_START;
- COMBA_CLEAR;
- /* 0 */
- MULADD(at[0], at[9]);
- COMBA_STORE(C->dp[0]);
- /* 1 */
- COMBA_FORWARD;
- MULADD(at[0], at[10]); MULADD(at[1], at[9]);
- COMBA_STORE(C->dp[1]);
- /* 2 */
- COMBA_FORWARD;
- MULADD(at[0], at[11]); MULADD(at[1], at[10]); MULADD(at[2], at[9]);
- COMBA_STORE(C->dp[2]);
- /* 3 */
- COMBA_FORWARD;
- MULADD(at[0], at[12]); MULADD(at[1], at[11]); MULADD(at[2], at[10]); MULADD(at[3], at[9]);
- COMBA_STORE(C->dp[3]);
- /* 4 */
- 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]);
- COMBA_STORE(C->dp[4]);
- /* 5 */
- 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]);
- COMBA_STORE(C->dp[5]);
- /* 6 */
- 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]);
- COMBA_STORE(C->dp[6]);
- /* 7 */
- COMBA_FORWARD;
- MULADD(at[0], at[16]); 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[7]);
- /* 8 */
- COMBA_FORWARD;
- MULADD(at[0], at[17]); MULADD(at[1], at[16]); 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]); MULADD(at[8], at[9]);
- COMBA_STORE(C->dp[8]);
- /* 9 */
- COMBA_FORWARD;
- MULADD(at[1], at[17]); MULADD(at[2], at[16]); 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]); MULADD(at[8], at[10]);
- COMBA_STORE(C->dp[9]);
- /* 10 */
- COMBA_FORWARD;
- MULADD(at[2], at[17]); MULADD(at[3], at[16]); MULADD(at[4], at[15]); MULADD(at[5], at[14]); MULADD(at[6], at[13]); MULADD(at[7], at[12]); MULADD(at[8], at[11]);
- COMBA_STORE(C->dp[10]);
- /* 11 */
- COMBA_FORWARD;
- MULADD(at[3], at[17]); MULADD(at[4], at[16]); MULADD(at[5], at[15]); MULADD(at[6], at[14]); MULADD(at[7], at[13]); MULADD(at[8], at[12]);
- COMBA_STORE(C->dp[11]);
- /* 12 */
- COMBA_FORWARD;
- MULADD(at[4], at[17]); MULADD(at[5], at[16]); MULADD(at[6], at[15]); MULADD(at[7], at[14]); MULADD(at[8], at[13]);
- COMBA_STORE(C->dp[12]);
- /* 13 */
- COMBA_FORWARD;
- MULADD(at[5], at[17]); MULADD(at[6], at[16]); MULADD(at[7], at[15]); MULADD(at[8], at[14]);
- COMBA_STORE(C->dp[13]);
- /* 14 */
- COMBA_FORWARD;
- MULADD(at[6], at[17]); MULADD(at[7], at[16]); MULADD(at[8], at[15]);
- COMBA_STORE(C->dp[14]);
- /* 15 */
- COMBA_FORWARD;
- MULADD(at[7], at[17]); MULADD(at[8], at[16]);
- COMBA_STORE(C->dp[15]);
- /* 16 */
- COMBA_FORWARD;
- MULADD(at[8], at[17]);
- COMBA_STORE(C->dp[16]);
- COMBA_STORE2(C->dp[17]);
- C->used = 18;
- 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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