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use rand::{rngs::OsRng, RngCore};
use sha1::{Digest, Sha1};
fn generate_secret_key() -> [u8; 16] {
let mut key = [0u8; 16];
OsRng.fill_bytes(&mut key);
key
}
fn digest_data(server_id: &[u8], public_key: &[u8], private_key: &[u8]) -> Vec<u8> {
let mut digest = Sha1::new();
digest.update(server_id);
digest.update(public_key);
digest.update(private_key);
digest.finalize().to_vec()
}
fn hex_digest(digest: &[u8]) -> String {
// Note that the Sha1.hexdigest() method used by minecraft is non standard.
// It doesn't match the digest method found in most programming languages
// and libraries. It works by treating the sha1 output bytes as one large
// integer in two's complement and then printing the integer in base 16,
// placing a minus sign if the interpreted number is negative.
num_bigint::BigInt::from_signed_bytes_be(digest).to_str_radix(16)
}
fn encrypt(public_key: &[u8], server_id: String, nonce: &[u8]) {
let secret_key = generate_secret_key();
let hash = hex_digest(&digest_data(server_id.as_bytes(), public_key, &secret_key));
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_generate_secret_key() {
let key = generate_secret_key();
assert_eq!(key.len(), 16);
}
#[test]
fn test_hex_digest() {
let digest = hex_digest(&digest_data(b"Notch", &[], &[]));
assert_eq!(digest, "4ed1f46bbe04bc756bcb17c0c7ce3e4632f06a48");
let digest = hex_digest(&digest_data(b"jeb_", &[], &[]));
assert_eq!(digest, "-7c9d5b0044c130109a5d7b5fb5c317c02b4e28c1");
let digest = hex_digest(&digest_data(b"simon", &[], &[]));
assert_eq!(digest, "88e16a1019277b15d58faf0541e11910eb756f6");
}
}
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