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--- /dev/null +++ b/Cargo.toml @@ -0,0 +1,11 @@ +[package] +name = "rsa" +version = "0.1.0" +edition = "2021" + +[dependencies] +colog = "1.3.0" +log = "0.4.22" +num-bigint = { version = "0.4.6", features = ["rand"] } +num-traits = "0.2.19" +rand = "0.8.5" diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..1d74bad --- /dev/null +++ b/src/main.rs @@ -0,0 +1,104 @@ +use colog; +use log::info; +use num_bigint::{BigInt, BigUint, RandBigInt, ToBigInt}; +use num_traits::cast::ToPrimitive; +use num_traits::{One, Zero}; +use rand::thread_rng; +use std::io; + +pub struct RSA { + pub n: BigUint, + pub e: BigUint, + pub d: BigUint, +} + +impl RSA { + pub fn new(_key_size: usize) -> Self { + let mut _rng = thread_rng(); + + let p = _rng.gen_biguint(1024); + let q = _rng.gen_biguint(1024); + let n = &p * &q; + + let phi = (&p - BigUint::one()) * (&q - BigUint::one()); + let e = _rng.gen_biguint(1024); + let d = mod_inverse(&e, &phi).unwrap(); + + RSA { n, e, d } + } + + pub fn encrypt(&self, message: &str) -> Vec { + message + .bytes() + .map(|b| { + let m = BigUint::from(b as u32); + if m >= self.n { + panic!("Message too large for current key size"); + } + m.modpow(&self.e, &self.n) + }) + .collect() + } + + pub fn decrypt(&self, encrypted: &[BigUint]) -> String { + let decrypted: Vec = encrypted + .iter() + .map(|c| { + let m = c.modpow(&self.d, &self.n); + m.to_u8().unwrap() + }) + .collect(); + + String::from_utf8(decrypted).expect("Failed to decode UTF-8") + } +} + +fn mod_inverse(a: &BigUint, m: &BigUint) -> Option { + let mut t = BigInt::zero(); + let mut newt = BigInt::one(); + let mut r = m.to_bigint().unwrap(); + let mut newr = a.to_bigint().unwrap(); + + while !newr.is_zero() { + let quotient = &r / &newr; + let (temp_t, temp_r) = (t.clone(), r.clone()); + t = newt.clone(); + r = newr.clone(); + newt = temp_t - "ient * &newt; + newr = temp_r - "ient * &newr; + } + + if r > BigInt::one() { + return None; + } + + while t < BigInt::zero() { + t = t + &m.to_bigint().unwrap(); + } + + Some(t.to_biguint().unwrap()) +} + +fn main() { + colog::init(); + info!("RSA Encryption/Decryption"); + info!("Enter a message to encrypt:"); + + let rsa = RSA::new(1024); // Small key size for testing + let mut message: String = "".to_string(); + match io::stdin().read_line(&mut message) { + Ok(n) => match n { + 0 => info!("No input provided"), + _ => info!("{} bytes read", n), + }, + Err(error) => println!("error: {error}"), + } + + info!("Original: {}", message); + + let encrypted = rsa.encrypt(&message); + info!("Encrypted: {:?}", encrypted); + + let decrypted = rsa.decrypt(&encrypted); + info!("Decrypted: {}", decrypted); +}