1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/* fp_mul_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_MUL4
int fp_mul_comba4(fp_int *A, fp_int *B, fp_int *C)
{
fp_digit c0, c1, c2;
#ifndef WOLFSSL_SMALL_STACK
fp_digit at[8];
#else
fp_digit *at;
#endif
#ifdef WOLFSSL_SMALL_STACK
at = (fp_digit*)XMALLOC(sizeof(fp_digit) * 8, NULL, DYNAMIC_TYPE_TMP_BUFFER);
if (at == NULL)
return FP_MEM;
#endif
XMEMCPY(at, A->dp, 4 * sizeof(fp_digit));
XMEMCPY(at+4, B->dp, 4 * sizeof(fp_digit));
COMBA_START;
COMBA_CLEAR;
/* 0 */
MULADD(at[0], at[4]);
COMBA_STORE(C->dp[0]);
/* 1 */
COMBA_FORWARD;
MULADD(at[0], at[5]); MULADD(at[1], at[4]);
COMBA_STORE(C->dp[1]);
/* 2 */
COMBA_FORWARD;
MULADD(at[0], at[6]); MULADD(at[1], at[5]); MULADD(at[2], at[4]);
COMBA_STORE(C->dp[2]);
/* 3 */
COMBA_FORWARD;
MULADD(at[0], at[7]); MULADD(at[1], at[6]); MULADD(at[2], at[5]); MULADD(at[3], at[4]);
COMBA_STORE(C->dp[3]);
/* 4 */
COMBA_FORWARD;
MULADD(at[1], at[7]); MULADD(at[2], at[6]); MULADD(at[3], at[5]);
COMBA_STORE(C->dp[4]);
/* 5 */
COMBA_FORWARD;
MULADD(at[2], at[7]); MULADD(at[3], at[6]);
COMBA_STORE(C->dp[5]);
/* 6 */
COMBA_FORWARD;
MULADD(at[3], at[7]);
COMBA_STORE(C->dp[6]);
COMBA_STORE2(C->dp[7]);
C->used = 8;
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
|
