Used forked shamir
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Sosthene00
parent
58de1c14ba
commit
8cd7a8f361
@ -29,7 +29,7 @@ image = "0.24.9"
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img-parts = "0.3.0"
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bytes = "1.5.0"
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scrypt = "0.11.0"
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shamir = "2.0.0"
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shamir = { git = "https://github.com/Sosthene00/shamir", branch = "master" }
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[dev-dependencies]
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wasm-bindgen-test = "0.3"
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@ -3,5 +3,4 @@ mod aesgcm;
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pub mod api;
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mod injecteurhtml;
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mod process;
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mod secretdata;
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mod user;
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@ -1,266 +0,0 @@
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use rand::{thread_rng, RngCore};
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pub struct SecretData {
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pub secret_data: Option<String>,
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pub coefficients: Vec<Vec<u8>>,
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}
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#[derive(Debug)]
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pub enum ShamirError {
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/// The number of shares must be between 1 and 255
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InvalidShareCount,
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}
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impl SecretData {
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pub fn with_secret(secret: &str, threshold: u8) -> SecretData {
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let mut coefficients: Vec<Vec<u8>> = vec![];
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let mut rng = thread_rng();
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let mut rand_container = vec![0u8; (threshold - 1) as usize];
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for c in secret.as_bytes() {
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rng.fill_bytes(&mut rand_container);
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let mut coef: Vec<u8> = vec![*c];
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for r in rand_container.iter() {
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coef.push(*r);
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}
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coefficients.push(coef);
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}
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SecretData {
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secret_data: Some(secret.to_string()),
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coefficients,
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}
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}
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pub fn get_share(&self, id: u8) -> Result<Vec<u8>, ShamirError> {
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if id == 0 {
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return Err(ShamirError::InvalidShareCount);
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}
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let mut share_bytes: Vec<u8> = vec![];
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let coefficients = self.coefficients.clone();
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for coefficient in coefficients {
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//let b = SecretData::accumulate_share_bytes(id, coefficient)?;
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let b = r#try!(SecretData::accumulate_share_bytes(id, coefficient));
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share_bytes.push(b);
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}
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share_bytes.insert(0, id);
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Ok(share_bytes)
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}
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pub fn is_valid_share(&self, share: &[u8]) -> bool {
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let id = share[0];
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match self.get_share(id) {
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Ok(s) => s == share,
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_ => false,
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}
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}
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pub fn recover_secret(threshold: u8, shares: Vec<Vec<u8>>) -> Option<String> {
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if threshold as usize > shares.len() {
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println!("Number of shares is below the threshold");
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return None;
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}
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let mut xs: Vec<u8> = vec![];
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for share in shares.iter() {
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if xs.contains(&share[0]) {
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println!("Multiple shares with the same first byte");
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return None;
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}
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if share.len() != shares[0].len() {
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println!("Shares have different lengths");
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return None;
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}
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xs.push(share[0].to_owned());
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}
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let mut mycoefficients: Vec<String> = vec![];
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let mut mysecretdata: Vec<u8> = vec![];
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let rounds = shares[0].len() - 1;
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for byte_to_use in 0..rounds {
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let mut fxs: Vec<u8> = vec![];
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for share in shares.clone() {
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fxs.push(share[1..][byte_to_use]);
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}
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match SecretData::full_lagrange(&xs, &fxs) {
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None => return None,
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Some(resulting_poly) => {
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mycoefficients.push(String::from_utf8_lossy(&resulting_poly[..]).to_string());
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mysecretdata.push(resulting_poly[0]);
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}
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}
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}
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match String::from_utf8(mysecretdata) {
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Ok(s) => Some(s),
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Err(e) => {
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println!("{:?}", e);
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None
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}
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}
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}
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fn accumulate_share_bytes(id: u8, coefficient_bytes: Vec<u8>) -> Result<u8, ShamirError> {
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if id == 0 {
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return Err(ShamirError::InvalidShareCount);
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}
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let mut accumulator: u8 = 0;
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let mut x_i: u8 = 1;
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for c in coefficient_bytes {
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accumulator = SecretData::gf256_add(accumulator, SecretData::gf256_mul(c, x_i));
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x_i = SecretData::gf256_mul(x_i, id);
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}
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Ok(accumulator)
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}
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fn full_lagrange(xs: &[u8], fxs: &[u8]) -> Option<Vec<u8>> {
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let mut returned_coefficients: Vec<u8> = vec![];
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let len = fxs.len();
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for i in 0..len {
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let mut this_polynomial: Vec<u8> = vec![1];
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for j in 0..len {
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if i == j {
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continue;
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}
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let denominator = SecretData::gf256_sub(xs[i], xs[j]);
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let first_term = SecretData::gf256_checked_div(xs[j], denominator);
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let second_term = SecretData::gf256_checked_div(1, denominator);
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match (first_term, second_term) {
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(Some(a), Some(b)) => {
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let this_term = vec![a, b];
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this_polynomial =
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SecretData::multiply_polynomials(&this_polynomial, &this_term);
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}
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(_, _) => return None,
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};
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}
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if fxs.len() + 1 >= i {
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this_polynomial = SecretData::multiply_polynomials(&this_polynomial, &[fxs[i]])
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}
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returned_coefficients =
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SecretData::add_polynomials(&returned_coefficients, &this_polynomial);
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}
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Some(returned_coefficients)
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}
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#[inline]
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fn gf256_add(a: u8, b: u8) -> u8 {
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a ^ b
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}
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#[inline]
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fn gf256_sub(a: u8, b: u8) -> u8 {
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SecretData::gf256_add(a, b)
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}
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#[inline]
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fn gf256_mul(a: u8, b: u8) -> u8 {
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if a == 0 || b == 0 {
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0
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} else {
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GF256_EXP[((u16::from(GF256_LOG[a as usize]) + u16::from(GF256_LOG[b as usize])) % 255)
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as usize]
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}
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}
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#[inline]
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fn gf256_checked_div(a: u8, b: u8) -> Option<u8> {
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if a == 0 {
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Some(0)
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} else if b == 0 {
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None
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} else {
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let a_log = i16::from(GF256_LOG[a as usize]);
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let b_log = i16::from(GF256_LOG[b as usize]);
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let mut diff = a_log - b_log;
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if diff < 0 {
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diff += 255;
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}
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Some(GF256_EXP[(diff % 255) as usize])
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}
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}
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#[inline]
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fn multiply_polynomials(a: &[u8], b: &[u8]) -> Vec<u8> {
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let mut resultterms: Vec<u8> = vec![];
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let mut termpadding: Vec<u8> = vec![];
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for bterm in b {
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let mut thisvalue = termpadding.clone();
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for aterm in a {
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thisvalue.push(SecretData::gf256_mul(*aterm, *bterm));
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}
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resultterms = SecretData::add_polynomials(&resultterms, &thisvalue);
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termpadding.push(0);
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}
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resultterms
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}
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#[inline]
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fn add_polynomials(a: &[u8], b: &[u8]) -> Vec<u8> {
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let mut a = a.to_owned();
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let mut b = b.to_owned();
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if a.len() < b.len() {
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let mut t = vec![0; b.len() - a.len()];
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a.append(&mut t);
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} else if a.len() > b.len() {
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let mut t = vec![0; a.len() - b.len()];
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b.append(&mut t);
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}
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let mut results: Vec<u8> = vec![];
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for i in 0..a.len() {
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results.push(SecretData::gf256_add(a[i], b[i]));
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}
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results
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}
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}
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static GF256_EXP: [u8; 256] = [
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0x01, 0x03, 0x05, 0x0f, 0x11, 0x33, 0x55, 0xff, 0x1a, 0x2e, 0x72, 0x96, 0xa1, 0xf8, 0x13, 0x35,
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0x5f, 0xe1, 0x38, 0x48, 0xd8, 0x73, 0x95, 0xa4, 0xf7, 0x02, 0x06, 0x0a, 0x1e, 0x22, 0x66, 0xaa,
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0xe5, 0x34, 0x5c, 0xe4, 0x37, 0x59, 0xeb, 0x26, 0x6a, 0xbe, 0xd9, 0x70, 0x90, 0xab, 0xe6, 0x31,
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0x53, 0xf5, 0x04, 0x0c, 0x14, 0x3c, 0x44, 0xcc, 0x4f, 0xd1, 0x68, 0xb8, 0xd3, 0x6e, 0xb2, 0xcd,
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0x4c, 0xd4, 0x67, 0xa9, 0xe0, 0x3b, 0x4d, 0xd7, 0x62, 0xa6, 0xf1, 0x08, 0x18, 0x28, 0x78, 0x88,
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0x83, 0x9e, 0xb9, 0xd0, 0x6b, 0xbd, 0xdc, 0x7f, 0x81, 0x98, 0xb3, 0xce, 0x49, 0xdb, 0x76, 0x9a,
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0xb5, 0xc4, 0x57, 0xf9, 0x10, 0x30, 0x50, 0xf0, 0x0b, 0x1d, 0x27, 0x69, 0xbb, 0xd6, 0x61, 0xa3,
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0xfe, 0x19, 0x2b, 0x7d, 0x87, 0x92, 0xad, 0xec, 0x2f, 0x71, 0x93, 0xae, 0xe9, 0x20, 0x60, 0xa0,
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0xfb, 0x16, 0x3a, 0x4e, 0xd2, 0x6d, 0xb7, 0xc2, 0x5d, 0xe7, 0x32, 0x56, 0xfa, 0x15, 0x3f, 0x41,
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0xc3, 0x5e, 0xe2, 0x3d, 0x47, 0xc9, 0x40, 0xc0, 0x5b, 0xed, 0x2c, 0x74, 0x9c, 0xbf, 0xda, 0x75,
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0x9f, 0xba, 0xd5, 0x64, 0xac, 0xef, 0x2a, 0x7e, 0x82, 0x9d, 0xbc, 0xdf, 0x7a, 0x8e, 0x89, 0x80,
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0x9b, 0xb6, 0xc1, 0x58, 0xe8, 0x23, 0x65, 0xaf, 0xea, 0x25, 0x6f, 0xb1, 0xc8, 0x43, 0xc5, 0x54,
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0xfc, 0x1f, 0x21, 0x63, 0xa5, 0xf4, 0x07, 0x09, 0x1b, 0x2d, 0x77, 0x99, 0xb0, 0xcb, 0x46, 0xca,
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0x45, 0xcf, 0x4a, 0xde, 0x79, 0x8b, 0x86, 0x91, 0xa8, 0xe3, 0x3e, 0x42, 0xc6, 0x51, 0xf3, 0x0e,
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0x12, 0x36, 0x5a, 0xee, 0x29, 0x7b, 0x8d, 0x8c, 0x8f, 0x8a, 0x85, 0x94, 0xa7, 0xf2, 0x0d, 0x17,
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0x39, 0x4b, 0xdd, 0x7c, 0x84, 0x97, 0xa2, 0xfd, 0x1c, 0x24, 0x6c, 0xb4, 0xc7, 0x52, 0xf6, 0x01,
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];
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static GF256_LOG: [u8; 256] = [
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0x00, 0x00, 0x19, 0x01, 0x32, 0x02, 0x1a, 0xc6, 0x4b, 0xc7, 0x1b, 0x68, 0x33, 0xee, 0xdf, 0x03,
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0x64, 0x04, 0xe0, 0x0e, 0x34, 0x8d, 0x81, 0xef, 0x4c, 0x71, 0x08, 0xc8, 0xf8, 0x69, 0x1c, 0xc1,
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0x7d, 0xc2, 0x1d, 0xb5, 0xf9, 0xb9, 0x27, 0x6a, 0x4d, 0xe4, 0xa6, 0x72, 0x9a, 0xc9, 0x09, 0x78,
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0x65, 0x2f, 0x8a, 0x05, 0x21, 0x0f, 0xe1, 0x24, 0x12, 0xf0, 0x82, 0x45, 0x35, 0x93, 0xda, 0x8e,
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0x96, 0x8f, 0xdb, 0xbd, 0x36, 0xd0, 0xce, 0x94, 0x13, 0x5c, 0xd2, 0xf1, 0x40, 0x46, 0x83, 0x38,
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0x66, 0xdd, 0xfd, 0x30, 0xbf, 0x06, 0x8b, 0x62, 0xb3, 0x25, 0xe2, 0x98, 0x22, 0x88, 0x91, 0x10,
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0x7e, 0x6e, 0x48, 0xc3, 0xa3, 0xb6, 0x1e, 0x42, 0x3a, 0x6b, 0x28, 0x54, 0xfa, 0x85, 0x3d, 0xba,
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0x2b, 0x79, 0x0a, 0x15, 0x9b, 0x9f, 0x5e, 0xca, 0x4e, 0xd4, 0xac, 0xe5, 0xf3, 0x73, 0xa7, 0x57,
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0xaf, 0x58, 0xa8, 0x50, 0xf4, 0xea, 0xd6, 0x74, 0x4f, 0xae, 0xe9, 0xd5, 0xe7, 0xe6, 0xad, 0xe8,
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0x2c, 0xd7, 0x75, 0x7a, 0xeb, 0x16, 0x0b, 0xf5, 0x59, 0xcb, 0x5f, 0xb0, 0x9c, 0xa9, 0x51, 0xa0,
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0x7f, 0x0c, 0xf6, 0x6f, 0x17, 0xc4, 0x49, 0xec, 0xd8, 0x43, 0x1f, 0x2d, 0xa4, 0x76, 0x7b, 0xb7,
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0xcc, 0xbb, 0x3e, 0x5a, 0xfb, 0x60, 0xb1, 0x86, 0x3b, 0x52, 0xa1, 0x6c, 0xaa, 0x55, 0x29, 0x9d,
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0x97, 0xb2, 0x87, 0x90, 0x61, 0xbe, 0xdc, 0xfc, 0xbc, 0x95, 0xcf, 0xcd, 0x37, 0x3f, 0x5b, 0xd1,
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0x53, 0x39, 0x84, 0x3c, 0x41, 0xa2, 0x6d, 0x47, 0x14, 0x2a, 0x9e, 0x5d, 0x56, 0xf2, 0xd3, 0xab,
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0x44, 0x11, 0x92, 0xd9, 0x23, 0x20, 0x2e, 0x89, 0xb4, 0x7c, 0xb8, 0x26, 0x77, 0x99, 0xe3, 0xa5,
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0x67, 0x4a, 0xed, 0xde, 0xc5, 0x31, 0xfe, 0x18, 0x0d, 0x63, 0x8c, 0x80, 0xc0, 0xf7, 0x70, 0x07,
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];
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