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SSH security

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This commit is contained in:
nora 2024-08-20 15:33:19 +02:00
parent 8f11974c76
commit 0c344cd1b0
7 changed files with 384 additions and 33 deletions
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32
helpers/ciphertext-tampering/src/main.rs Normal file
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use chacha20::cipher::KeyIvInit;
use chacha20::cipher::StreamCipher;
use chacha20::cipher::StreamCipherSeek;
fn main() {
let key: chacha20::Key = [
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 19, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
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 plaintext = "ls -l /etc".as_bytes().to_vec();
eprintln!("{:x?}", plaintext);
cipher.apply_keystream(&mut plaintext);
eprintln!("{:x?}", plaintext);
flippit(&mut plaintext);
eprintln!("{:x?}", plaintext);
cipher.seek(0);
cipher.apply_keystream(&mut plaintext);
eprintln!("{:x?}", plaintext);
eprintln!("{:x?}", String::from_utf8(plaintext).unwrap());
}
fn flippit(ciphertext: &mut [u8]) {
ciphertext[0] ^= 0b0001_1110;
ciphertext[1] ^= 0b0001_1110;
ciphertext[4] ^= 0b0001_1110;
}