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feat: gfmul and aes gcm working

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0xalivecow 2024-11-03 10:58:52 +01:00
parent 8db0bbaa63
commit e33a26adab
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4 changed files with 137 additions and 6 deletions
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17
src/utils/poly.rs
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@ -4,7 +4,7 @@ use base64::prelude::*;
use serde_json::Value;
use std::{str::FromStr, u128, u8, usize};
use super::field;
use super::{field, math::reverse_bits_in_bytevec};
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>> {
@ -17,15 +17,20 @@ pub fn gfmul(poly_a: Vec<u8>, poly_b: Vec<u8>, semantic: &str) -> Result<Vec<u8>
let mut poly2: ByteArray = ByteArray(poly_b);
poly2.0.push(0x00);
if semantic == "gcm" {
poly1.reverse_bits_in_bytevec();
poly2.reverse_bits_in_bytevec();
}
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)?;
poly2.right_shift("xex")?;
while !poly2.is_empty() {
poly1.left_shift(semantic)?;
poly1.left_shift("xex")?;
if poly1.msb_is_one() {
poly1.xor_byte_arrays(&red_poly_bytes);
@ -35,11 +40,15 @@ pub fn gfmul(poly_a: Vec<u8>, poly_b: Vec<u8>, semantic: &str) -> Result<Vec<u8>
result.xor_byte_arrays(&poly1);
}
poly2.right_shift(semantic)?;
poly2.right_shift("xex")?;
}
result.0.remove(16);
if semantic == "gcm" {
result.reverse_bits_in_bytevec();
}
Ok(result.0)
}