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lrwn: Add function for encrypting McKey.

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This commit is contained in:
Orne Brocaar 2025-02-19 08:52:38 +00:00
parent 62e8cfb7f1
commit d3dd14b029
1 changed files with 25 additions and 0 deletions
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25
lrwn/src/applayer/multicastsetup/v1.rs
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@ -1,3 +1,4 @@
use aes::cipher::BlockDecrypt;
use aes::cipher::{generic_array::GenericArray, BlockEncrypt, KeyInit};
use aes::{Aes128, Block};
use anyhow::Result;
@ -775,6 +776,19 @@ pub fn get_mc_net_s_key(mc_key: AES128Key, mc_addr: DevAddr) -> Result<AES128Key
get_key(mc_key, b)
}
pub fn encrypt_mc_key(mc_ke_key: AES128Key, mc_key: AES128Key) -> [u8; 16] {
let mc_ke_key_bytes = mc_ke_key.to_bytes();
let mut mc_key_bytes = mc_key.to_bytes();
let key = GenericArray::from_slice(&mc_ke_key_bytes);
let cipher = Aes128::new(key);
let block = Block::from_mut_slice(&mut mc_key_bytes);
cipher.decrypt_block(block);
mc_key_bytes
}
fn get_key(key: AES128Key, b: [u8; 16]) -> Result<AES128Key> {
let key_bytes = key.to_bytes();
let key = GenericArray::from_slice(&key_bytes);
@ -1367,6 +1381,17 @@ mod test {
);
}
#[test]
fn test_encrypt_mc_key() {
let ke_key = AES128Key::from_bytes([1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]);
let mc_key = AES128Key::from_bytes([2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2]);
assert_eq!(
[52, 55, 214, 226, 49, 215, 2, 65, 155, 81, 180, 148, 114, 113, 182, 17],
encrypt_mc_key(ke_key, mc_key)
);
}
fn run_tests_encode(tests: &[CommandTest]) {
for tst in tests {
println!("> {}", tst.name);