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parity-common
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not overflowing ops actually

This commit is contained in:
NikVolf 2017-05-21 19:33:27 +03:00
parent 91d4e57588
commit 61304129ae
1 changed files with 7 additions and 8 deletions
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15
examples/modular.rs
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@ -24,30 +24,29 @@ fn main() {
// (p-1) + (p+1) = 0
// (p - 1) mod p
let (p_minus_1, _) = (p - 1u64.into()).overflowing_rem(p);
let p_minus_1 = (p - 1u64.into()) % p;
// (p + 1) mod p
let (p_plus_1, _) = (p + 1u64.into()).overflowing_rem(p);
let p_plus_1 = (p + 1u64.into()) % p;
// ((p - 1) mod p + (p + 1) mod p) mod p
let (sum, _) = (p_minus_1 + p_plus_1).overflowing_rem(p);
let sum = (p_minus_1 + p_plus_1) % p;
assert_eq!(sum, 0.into());
// on this field,
// (p-1) + (p-1) = p-2
let (p_minus_1, _) = (p - 1u64.into()).overflowing_rem(p);
let (sum, _) = (p_minus_1 + p_minus_1).overflowing_rem(p);
let p_minus_1 = (p - 1u64.into()) % p;
let sum = (p_minus_1 + p_minus_1) % p;
assert_eq!(sum, p - 2.into());
// on this field,
// (p-1) * 3 = p-3
let (p_minus_1, _) = (p - 1u64.into()).overflowing_rem(p);
let p_minus_1 = (p - 1u64.into()) % p;
// multiplication is a series of additions
let multiplicator = 3;
let mul = {
let mut result = p_minus_1;
for _ in 0..multiplicator-1 {
let (s, _) = (p_minus_1 + result).overflowing_rem(p);
result = s;
result = (p_minus_1 + result) % p;
}
result
};