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Finnish kalinski_modular_inverse tests.

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All tests are passing and Kalinski Inverse
has been introduced on the code replacing
the last mod_inv implementation.
This commit is contained in:
kr0
2019-07-19 10:16:46 +02:00
parent 70d54af4f1
commit 79f06be242
1 changed files with 5 additions and 13 deletions
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18
shamirsecretsharing-rs/src/lib.rs
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@@ -162,7 +162,7 @@ pub fn kalinski_inv(a: &BigInt, modulo: &BigInt) -> BigInt {
let mut rr = r.clone();
let _p = modulo;
for _i in 0..(k - modulo.bits() as u64) {
for _i in 0..*k {
match rr.is_even() {
true => {
rr = rr >> 1;
@@ -258,21 +258,13 @@ mod tests {
let expected2 = BigInt::from(94u64);
assert_eq!(res2, expected2);
// Big numbers testing.
// C = 19.
// modul2 = 2^255 - 19.
let modul2 = BigInt::from_str("57896044618658097711785492504343953926634992332820282019728792003956564819949").unwrap();
let c = BigInt::from_str("19").unwrap();
let res3 = kalinski_inv(&c, &modul2);
let expected3 = BigInt::from_str("1").unwrap();
assert_eq!(res3, expected3);
// D = 182687704666362864775460604089535377456991567872.
// modul3 = 2^252 + 27742317777372353535851937790883648493.
// Modulo: 2^252 + 27742317777372353535851937790883648493
// Tested: 182687704666362864775460604089535377456991567872
// Expected for: inverse_mod(a, l) computed on SageMath:
// `7155219595916845557842258654134856828180378438239419449390401977965479867845`.
let modul3 = BigInt::from_str("7237005577332262213973186563042994240857116359379907606001950938285454250989").unwrap();
let d = BigInt::from_str("182687704666362864775460604089535377456991567872").unwrap();
let res4 = kalinski_inv(&d, &modul3);
println!("RES ON IMPL: {}", res4);
let expected4 = BigInt::from_str("7155219595916845557842258654134856828180378438239419449390401977965479867845").unwrap();
assert_eq!(expected4, res4);
}