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Fix shift and clear digits

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This commit is contained in:
Tesfa Mael
2020-12-10 16:13:30 -08:00
parent 4bd49d2b28
commit 9042843e42
1 changed files with 4 additions and 2 deletions
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6
wolfcrypt/src/integer.c
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@@ -684,8 +684,10 @@ int mp_mod_2d (mp_int * a, int b, mp_int * c)
c->dp[x] = 0;
}
/* clear the digit that is not completely outside/inside the modulus */
c->dp[b / DIGIT_BIT] &= (mp_digit) ((((mp_digit) 1) <<
(((mp_digit) b) % DIGIT_BIT)) - ((mp_digit) 1));
x = DIGIT_BIT - (b % DIGIT_BIT);
if (x != DIGIT_BIT) {
c->dp[b / DIGIT_BIT] &= ~((mp_digit)0) >> x;
}
mp_clamp (c);
return MP_OKAY;
}