27 lines
739 B
C
27 lines
739 B
C
#include "amplify_tommath_private.h"
|
|
#ifdef AMPLIFY_BN_MP_MULMOD_C
|
|
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
|
|
/* SPDX-License-Identifier: Unlicense */
|
|
/* Modifications Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. */
|
|
|
|
/* d = a * b (mod c) */
|
|
amplify_mp_err amplify_mp_mulmod(const amplify_mp_int *a, const amplify_mp_int *b, const amplify_mp_int *c, amplify_mp_int *d)
|
|
{
|
|
amplify_mp_err err;
|
|
amplify_mp_int t;
|
|
|
|
if ((err = amplify_mp_init_size(&t, c->used)) != AMPLIFY_MP_OKAY) {
|
|
return err;
|
|
}
|
|
|
|
if ((err = amplify_mp_mul(a, b, &t)) != AMPLIFY_MP_OKAY) {
|
|
goto LBL_ERR;
|
|
}
|
|
err = amplify_mp_mod(&t, c, d);
|
|
|
|
LBL_ERR:
|
|
amplify_mp_clear(&t);
|
|
return err;
|
|
}
|
|
#endif
|