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WIP: feat: working on gfmul gcm

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0xalivecow 2024-11-02 16:12:51 +01:00
parent 1ce30e1cea
commit 1e51015a14
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5 changed files with 86 additions and 42 deletions
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39
src/utils/poly.rs
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@ -9,27 +9,44 @@ 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);
red_poly_bytes.reverse_bits_in_bytevec();
let mut poly1: ByteArray = ByteArray(poly_a);
poly1.0.push(0x00);
let mut poly2: ByteArray = ByteArray(poly_b);
poly2.0.push(0x00);
eprintln!(
"poly1 is: {:001X?} \n poly2 is: {:001X?} \n gen poly is: {:001X?} \n",
poly1, poly2, red_poly_bytes
);
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() {
if poly2.msb_is_one() {
result.xor_byte_arrays(&poly1);
}
poly2.right_shift(semantic)?;
eprintln!(
"poly1 is: {:001X?} \n poly2 is: {:001X?} \n gen poly is: {:001X?} \n result is: {:001X?} \n ",
poly1, poly2, red_poly_bytes, result
);
while !poly2.is_empty() {
eprintln!(
"poly1 is: {:001X?} \n poly2 is: {:001X?} \n gen poly is: {:001X?} \n result is: {:001X?} \n ",
poly1, poly2, red_poly_bytes, result
);
poly1.left_shift(semantic)?;
if poly1.msb_is_one() {
if poly1.lsb_is_one() {
poly1.xor_byte_arrays(&red_poly_bytes);
}
if poly2.LSB_is_one() {
if poly2.msb_is_one() {
eprintln!("poly write to result");
result.xor_byte_arrays(&poly1);
}
@ -108,10 +125,10 @@ pub fn block_2_polynomial(block: Vec<u8>, semantic: &str) -> Result<Vec<u8>> {
let mut output: Vec<u8> = vec![];
match semantic {
"xex" => {
for i in 0u8..=15 {
for j in 0u8..=7 {
if (block[i as usize] >> j) & 1 == 1 {
output.push(8 * i + j);
for byte in 0u8..=15 {
for bit in 0u8..=7 {
if (block[byte as usize] >> bit) & 1 == 1 {
output.push(8 * byte + bit);
}
}
}
@ -119,10 +136,10 @@ pub fn block_2_polynomial(block: Vec<u8>, semantic: &str) -> Result<Vec<u8>> {
Ok(output)
}
"gcm" => {
for i in 0u8..=15 {
for j in 0u8..=7 {
if (block[i as usize] >> j) & 1 == 1 {
output.push(8 * i + 7 - j);
for byte in 0u8..=15 {
for bit in 0u8..=7 {
if (block[byte as usize] >> bit) & 1 == 1 {
output.push(8 * byte + 7 - bit);
}
}
}