creachadair_imath_sys

Function mp_int_invmod

source 
pub unsafe extern "C" fn mp_int_invmod(
    a: mp_int,
    m: mp_int,
    c: mp_int,
) -> mp_result
Expand description

Sets c to the multiplicative inverse of a modulo m, if it exists. The least non-negative representative of the congruence class is computed.

It returns MP_UNDEF if the inverse does not exist, or MP_RANGE if a == 0 or m <= 0.