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Use Lsh impl of BigInt.

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Bitshift to the left instead of multiply by 2
since performs ffaster than mul.
This commit is contained in:
kr0
2019-07-19 10:06:25 +02:00
parent bfbe547191
commit 70d54af4f1
1 changed files with 7 additions and 8 deletions
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15
shamirsecretsharing-rs/src/lib.rs
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@@ -111,7 +111,6 @@ pub fn kalinski_inv(a: &BigInt, modulo: &BigInt) -> BigInt {
let mut v = a.clone();
let mut r = BigInt::zero();
let mut s = BigInt::one();
let two = BigInt::from(2u64);
let mut k = 0u64;
while v > BigInt::zero() {
@@ -120,13 +119,13 @@ pub fn kalinski_inv(a: &BigInt, modulo: &BigInt) -> BigInt {
(true, _, _, _) => {
u = u >> 1;
s = &s * &two;
s = s << 1;
},
// u isn't even but v is even
(false, true, _, _) => {
v = v >> 1;
r = &r * &two;
r = &r << 1;
},
// u and v aren't even and u > v
(false, false, true, _) => {
@@ -134,7 +133,7 @@ pub fn kalinski_inv(a: &BigInt, modulo: &BigInt) -> BigInt {
u = &u - &v;
u = u >> 1;
r = &r + &s;
s = &s * &two;
s = &s << 1;
},
// u and v aren't even and v > u
(false, false, false, true) => {
@@ -142,7 +141,7 @@ pub fn kalinski_inv(a: &BigInt, modulo: &BigInt) -> BigInt {
v = &v - &u;
v = v >> 1;
s = &r + &s;
r = &r * &two;
r = &r << 1;
},
(false, false, false, false) => panic!("Unexpected error has ocurred."),
}
@@ -210,7 +209,7 @@ pub fn lagrange_interpolation(p: &BigInt, shares_packed: Vec<[BigInt;2]>) -> Big
}
let modinv_mul: BigInt;
if res_d != Zero::zero() {
let modinv = mod_inverse(res_d, p.clone());
let modinv = kalinski_inv(&res_d, &p);
modinv_mul = res_n * modinv;
} else {
modinv_mul = res_n;
@@ -268,13 +267,13 @@ mod tests {
let expected3 = BigInt::from_str("1").unwrap();
assert_eq!(res3, expected3);
/*// D = 182687704666362864775460604089535377456991567872.
// D = 182687704666362864775460604089535377456991567872.
// modul3 = 2^252 + 27742317777372353535851937790883648493.
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);*/
assert_eq!(expected4, res4);
}
}