57 lines
1.5 KiB
Rust
57 lines
1.5 KiB
Rust
use cryptonum::unsigned::*;
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use num::{BigInt,BigUint};
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use num::bigint::Sign;
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pub trait TranslateNums<N>: Sized {
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fn from_num(x: &N) -> Option<Self>;
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fn to_num(&self) -> N;
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}
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macro_rules! from_biguint {
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($uname: ident, $size: expr) => {
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impl TranslateNums<BigUint> for $uname {
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fn from_num(x: &BigUint) -> Option<$uname> {
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let mut base_vec = x.to_bytes_be();
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let target_bytes = $size / 8;
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if target_bytes < base_vec.len() {
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return None;
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}
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while target_bytes > base_vec.len() {
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base_vec.insert(0,0);
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}
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Some($uname::from_bytes(&base_vec))
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}
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fn to_num(&self) -> BigUint {
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let bytes = self.to_bytes();
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BigUint::from_bytes_be(&bytes)
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}
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}
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impl TranslateNums<BigInt> for $uname {
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fn from_num(x: &BigInt) -> Option<$uname> {
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let ux = x.to_biguint()?;
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$uname::from_num(&ux)
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}
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fn to_num(&self) -> BigInt {
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BigInt::from_biguint(Sign::Plus, self.to_num())
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}
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}
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};
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}
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from_biguint!(U192, 192);
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from_biguint!(U256, 256);
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from_biguint!(U384, 384);
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from_biguint!(U512, 512);
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from_biguint!(U576, 576);
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from_biguint!(U1024, 1024);
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from_biguint!(U2048, 2048);
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from_biguint!(U3072, 3072);
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from_biguint!(U4096, 4096);
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from_biguint!(U8192, 8192);
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from_biguint!(U15360, 15360); |