75 lines
2 KiB
Rust
75 lines
2 KiB
Rust
use std::{io::Write, rc::Rc};
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use hmac::Mac;
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use md5::{Digest, Md5};
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use rc4::{KeyInit, Rc4, StreamCipher};
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use rnex_core::prudp::{
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encryption::{DEFAULT_KEY, EncryptionPair},
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types_flags::{TypesFlags, types::DATA},
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};
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use typenum::U5;
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use crate::crypto::{
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Crypto, CryptoInstance,
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common_crypto::common_checksum,
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friends_common::{ACCESS_KEY, HmacMd5},
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};
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pub struct InsecureInstance {
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pair: EncryptionPair<Rc4<U5>>,
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self_signat: [u8; 4],
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remote_signat: [u8; 4],
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}
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impl CryptoInstance for InsecureInstance {
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fn decrypt_incoming(&mut self, data: &mut [u8]) {
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self.pair.recv.apply_keystream(data);
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}
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fn encrypt_outgoing(&mut self, data: &mut [u8]) {
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self.pair.send.apply_keystream(data);
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}
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fn get_user_id(&self) -> u32 {
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0
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}
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fn generate_signature(&self, types_flags: TypesFlags, data: &[u8]) -> [u8; 4] {
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if types_flags.get_types() == DATA {
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if data.len() == 0 {
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[0x78, 0x56, 0x34, 0x12]
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} else {
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let mut hash = Md5::new();
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hash.write(ACCESS_KEY.as_bytes()).unwrap();
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let mut hmac = <HmacMd5 as Mac>::new_from_slice(&hash.finalize().as_slice())
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.expect("unable to create hmac md5");
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hmac.update(data);
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hmac.finalize().into_bytes()[0..4].try_into().unwrap()
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}
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} else {
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self.self_signat
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}
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}
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}
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pub struct Insecure();
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impl Crypto for Insecure {
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type Instance = InsecureInstance;
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fn new() -> Self {
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Self()
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}
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fn calculate_checksum(&self, data: &[u8]) -> u8 {
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common_checksum(ACCESS_KEY, data)
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}
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fn instantiate(
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&self,
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packet_data: &[u8],
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self_signat: [u8; 4],
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remote_signat: [u8; 4],
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) -> Self::Instance {
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InsecureInstance {
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pair: EncryptionPair::init_both(|| Rc4::new(&DEFAULT_KEY)),
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self_signat,
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remote_signat,
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}
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}
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}
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