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| use std::collections::hash_map::DefaultHasher;
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| use std::fmt;
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| use std::hash::{Hash, Hasher};
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| #[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
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| pub struct Rtid(pub u128);
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|
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| impl Rtid {
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| pub fn derive(
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| exe_hash: u64,
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| parent: Option<Rtid>,
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| boot_nonce: u64,
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| start_ts_ms: u64,
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| runtime_nonce: u64,
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| ) -> Self {
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| let mut h1 = DefaultHasher::new();
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| exe_hash.hash(&mut h1);
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| parent.map(|p| p.0).unwrap_or(0).hash(&mut h1);
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| boot_nonce.hash(&mut h1);
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| start_ts_ms.hash(&mut h1);
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| runtime_nonce.hash(&mut h1);
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| let a = h1.finish();
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| let mut h2 = DefaultHasher::new();
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| a.hash(&mut h2);
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| runtime_nonce.rotate_left(17).hash(&mut h2);
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| exe_hash.rotate_left(31).hash(&mut h2);
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| let b = h2.finish();
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| Rtid(((a as u128) << 64) | b as u128)
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| }
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| pub fn short(&self) -> String {
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| format!("{:08x}", (self.0 >> 96) as u32)
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| }
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| }
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| impl fmt::Display for Rtid {
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| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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| write!(f, "{:032x}", self.0)
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| }
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| }
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| impl fmt::Debug for Rtid {
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| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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| write!(f, "Rtid({})", self.short())
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| }
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| }
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| pub fn exe_hash(bytes: &[u8]) -> u64 {
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| let mut h = DefaultHasher::new();
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| bytes.hash(&mut h);
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| h.finish()
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| }
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| #[cfg(test)]
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| mod tests {
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| use super::*;
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| #[test]
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| fn same_exe_different_runs_get_different_rtids() {
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| let eh = exe_hash(b"chrome.exe contents");
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| let a = Rtid::derive(eh, None, 42, 1000, 7);
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| let b = Rtid::derive(eh, None, 42, 1000, 8);
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| let c = Rtid::derive(eh, None, 42, 2000, 7);
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| assert_ne!(a, b);
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| assert_ne!(a, c);
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| }
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| #[test]
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| fn parent_changes_identity() {
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| let eh = exe_hash(b"cmd.exe");
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| let p1 = Rtid::derive(exe_hash(b"explorer"), None, 1, 1, 1);
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| let a = Rtid::derive(eh, Some(p1), 1, 5, 9);
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| let b = Rtid::derive(eh, None, 1, 5, 9);
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| assert_ne!(a, b);
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| }
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| }
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|
