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nora 2024-08-21 21:15:11 +02:00
parent 05aa48e8bc
commit d8ada21a25
2 changed files with 151 additions and 53 deletions
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35
helpers/ciphertext-tampering/src/main.rs
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@ -1,6 +1,9 @@
use chacha20::cipher::KeyIvInit;
use chacha20::cipher::StreamCipher;
use chacha20::cipher::StreamCipherSeek;
//! ```toml
//! [dependencies]
//! chacha20 = "0.9.1"
//! ````
use chacha20::cipher::{KeyIvInit, StreamCipher};
fn main() {
let key: chacha20::Key = [
@ -8,24 +11,28 @@ fn main() {
25, 26, 27, 28, 29, 30, 31,
]
.into();
let nonce: chacha20::Nonce = [0; 12].into();
let mut cipher = chacha20::ChaCha20::new(&key, &nonce);
let mut cipher = chacha20::ChaCha20::new(&key, &[0; 12].into());
let mut plaintext = "ls -l /etc".as_bytes().to_vec();
eprintln!("{:x?}", plaintext);
// Encrypt
let plaintext = "ls -l /etc";
eprintln!("plaintext: {:?}", plaintext);
let mut plaintext = plaintext.as_bytes().to_vec();
eprintln!("plaintext: {:x?}", plaintext);
cipher.apply_keystream(&mut plaintext);
eprintln!("ciphertext: {:x?}", plaintext);
eprintln!("{:x?}", plaintext);
flippit(&mut plaintext);
eprintln!("{:x?}", plaintext);
// Flipping
flip_it(&mut plaintext);
eprintln!("ciphertext 2: {:x?}", plaintext);
cipher.seek(0);
// Decrypt
let mut cipher = chacha20::ChaCha20::new(&key, &[0; 12].into());
cipher.apply_keystream(&mut plaintext);
eprintln!("{:x?}", plaintext);
eprintln!("{:x?}", String::from_utf8(plaintext).unwrap());
eprintln!("plaintext 2: {:x?}", plaintext);
eprintln!("plaintext 2: {:x?}", String::from_utf8(plaintext).unwrap());
}
fn flippit(ciphertext: &mut [u8]) {
fn flip_it(ciphertext: &mut [u8]) {
ciphertext[0] ^= 0b0001_1110;
ciphertext[1] ^= 0b0001_1110;
ciphertext[4] ^= 0b0001_1110;