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Implement decrypt transition

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This commit is contained in:
Richard Stöckl
2023-08-22 11:00:32 +02:00
parent e1eb530a7f
commit 5d54ad19e4
1 changed files with 21 additions and 0 deletions
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21
src/pcd.rs
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@@ -124,6 +124,27 @@ impl PCD<Encrypted> {
pub fn fragments(&self) -> Vec<PCDFragment> {
self.state.data.chunks_exact(PCD_EXTENDED_LENGTH / (PCD_FRAGMENTS - 1)).map(|f| <[u8; PCD_FRAGMENT_LENGTH]>::try_from(f).unwrap()).collect()
}
pub fn decrypt(self, address: &MacAddress, checksum: u16) -> PCD<Extended> {
let key = key(address, checksum);
let mut rc4 = Rc4::new(&key.into());
let mut data = self.state.data;
rc4.apply_keystream(data.as_mut());
let header: [u8; PCD_HEADER_LENGTH] = [0; PCD_HEADER_LENGTH];
let pgt: [u8; PCD_PGT_LENGTH] = [0; PCD_PGT_LENGTH];
let card_data: [u8; PCD_CARD_DATA_LENGTH] = [0; PCD_CARD_DATA_LENGTH];
header.copy_from_slice(&data[0..PCD_HEADER_LENGTH]);
pgt.copy_from_slice(&data[PCD_HEADER_LENGTH..PCD_PGT_LENGTH + PCD_HEADER_LENGTH]);
card_data.copy_from_slice(&data[2 * PCD_HEADER_LENGTH + PCD_PGT_LENGTH..PCD_CARD_DATA_LENGTH + PCD_PGT_LENGTH + 2 * PCD_HEADER_LENGTH]);
PCD {
state: Extended {
header,
pgt,
header_duplicate: header,
card_data,
}
}
}
}
fn key(address: &MacAddress, checksum: u16) -> [u8; 8] {