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refactor: externalise gfmul to make it more accessible and semantic support

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0xalivecow 2024-10-29 13:53:10 +01:00
parent 31050ea696
commit f4c49a9137
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5 changed files with 96 additions and 64 deletions
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40
src/utils/poly.rs
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@ -1,7 +1,45 @@
use crate::utils::math::ByteArray;
use anyhow::Result;
use base64::prelude::*;
use serde_json::Value;
use std::{str::FromStr, u128, u8, usize};
pub const RED_POLY: u128 = 0x87000000_00000000_00000000_00000000;
pub fn gfmul(poly_a: Vec<u8>, poly_b: Vec<u8>, semantic: &str) -> Result<Vec<u8>> {
let mut red_poly_bytes: ByteArray = ByteArray(RED_POLY.to_be_bytes().to_vec());
red_poly_bytes.0.push(0x01);
let mut poly1: ByteArray = ByteArray(poly_a);
poly1.0.push(0x00);
let mut poly2: ByteArray = ByteArray(poly_b);
poly2.0.push(0x00);
let mut result: ByteArray = ByteArray(vec![0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);
if poly2.LSB_is_one() {
result.xor_byte_arrays(&poly1);
poly2.right_shift(semantic);
} else {
poly2.right_shift(semantic);
}
while !poly2.is_empty() {
if poly2.LSB_is_one() {
poly1.left_shift();
poly1.xor_byte_arrays(&red_poly_bytes);
result.xor_byte_arrays(&poly1);
} else {
poly1.left_shift();
poly1.xor_byte_arrays(&red_poly_bytes);
}
poly2.right_shift(semantic);
}
result.0.remove(16);
Ok(result.0)
}
pub fn get_alpha_rep(num: u128) -> String {
let powers: Vec<u8> = get_coefficients(num);