524 lines
19 KiB
Rust
524 lines
19 KiB
Rust
//! This is a copy of `core::hash::sip` adapted to providing 128 bit hashes.
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use std::cmp;
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use std::hash::Hasher;
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use std::slice;
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use std::ptr;
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use std::mem;
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#[derive(Debug, Clone)]
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pub struct SipHasher128 {
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k0: u64,
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k1: u64,
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length: usize, // how many bytes we've processed
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state: State, // hash State
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tail: u64, // unprocessed bytes le
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ntail: usize, // how many bytes in tail are valid
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}
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#[derive(Debug, Clone, Copy)]
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#[repr(C)]
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struct State {
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// v0, v2 and v1, v3 show up in pairs in the algorithm,
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// and simd implementations of SipHash will use vectors
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// of v02 and v13. By placing them in this order in the struct,
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// the compiler can pick up on just a few simd optimizations by itself.
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v0: u64,
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v2: u64,
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v1: u64,
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v3: u64,
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}
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macro_rules! compress {
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($state:expr) => ({
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compress!($state.v0, $state.v1, $state.v2, $state.v3)
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});
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($v0:expr, $v1:expr, $v2:expr, $v3:expr) =>
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({
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$v0 = $v0.wrapping_add($v1); $v1 = $v1.rotate_left(13); $v1 ^= $v0;
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$v0 = $v0.rotate_left(32);
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$v2 = $v2.wrapping_add($v3); $v3 = $v3.rotate_left(16); $v3 ^= $v2;
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$v0 = $v0.wrapping_add($v3); $v3 = $v3.rotate_left(21); $v3 ^= $v0;
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$v2 = $v2.wrapping_add($v1); $v1 = $v1.rotate_left(17); $v1 ^= $v2;
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$v2 = $v2.rotate_left(32);
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});
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}
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/// Loads an integer of the desired type from a byte stream, in LE order. Uses
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/// `copy_nonoverlapping` to let the compiler generate the most efficient way
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/// to load it from a possibly unaligned address.
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///
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/// Unsafe because: unchecked indexing at i..i+size_of(int_ty)
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macro_rules! load_int_le {
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($buf:expr, $i:expr, $int_ty:ident) =>
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({
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debug_assert!($i + mem::size_of::<$int_ty>() <= $buf.len());
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let mut data = 0 as $int_ty;
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ptr::copy_nonoverlapping($buf.get_unchecked($i),
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&mut data as *mut _ as *mut u8,
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mem::size_of::<$int_ty>());
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data.to_le()
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});
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}
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/// Loads an u64 using up to 7 bytes of a byte slice.
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///
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/// Unsafe because: unchecked indexing at start..start+len
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#[inline]
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unsafe fn u8to64_le(buf: &[u8], start: usize, len: usize) -> u64 {
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debug_assert!(len < 8);
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let mut i = 0; // current byte index (from LSB) in the output u64
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let mut out = 0;
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if i + 3 < len {
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out = load_int_le!(buf, start + i, u32) as u64;
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i += 4;
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}
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if i + 1 < len {
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out |= (load_int_le!(buf, start + i, u16) as u64) << (i * 8);
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i += 2
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}
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if i < len {
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out |= (*buf.get_unchecked(start + i) as u64) << (i * 8);
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i += 1;
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}
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debug_assert_eq!(i, len);
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out
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}
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impl SipHasher128 {
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#[inline]
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pub fn new_with_keys(key0: u64, key1: u64) -> SipHasher128 {
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let mut state = SipHasher128 {
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k0: key0,
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k1: key1,
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length: 0,
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state: State {
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v0: 0,
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v1: 0,
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v2: 0,
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v3: 0,
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},
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tail: 0,
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ntail: 0,
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};
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state.reset();
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state
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}
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#[inline]
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fn reset(&mut self) {
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self.length = 0;
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self.state.v0 = self.k0 ^ 0x736f6d6570736575;
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self.state.v1 = self.k1 ^ 0x646f72616e646f6d;
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self.state.v2 = self.k0 ^ 0x6c7967656e657261;
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self.state.v3 = self.k1 ^ 0x7465646279746573;
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self.ntail = 0;
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// This is only done in the 128 bit version:
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self.state.v1 ^= 0xee;
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}
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// Specialized write function that is only valid for buffers with len <= 8.
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// It's used to force inlining of write_u8 and write_usize, those would normally be inlined
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// except for composite types (that includes slices and str hashing because of delimiter).
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// Without this extra push the compiler is very reluctant to inline delimiter writes,
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// degrading performance substantially for the most common use cases.
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#[inline]
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fn short_write(&mut self, msg: &[u8]) {
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debug_assert!(msg.len() <= 8);
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let length = msg.len();
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self.length += length;
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let needed = 8 - self.ntail;
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let fill = cmp::min(length, needed);
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if fill == 8 {
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self.tail = unsafe { load_int_le!(msg, 0, u64) };
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} else {
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self.tail |= unsafe { u8to64_le(msg, 0, fill) } << (8 * self.ntail);
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if length < needed {
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self.ntail += length;
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return;
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}
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}
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self.state.v3 ^= self.tail;
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Sip24Rounds::c_rounds(&mut self.state);
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self.state.v0 ^= self.tail;
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// Buffered tail is now flushed, process new input.
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self.ntail = length - needed;
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self.tail = unsafe { u8to64_le(msg, needed, self.ntail) };
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}
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#[inline(always)]
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fn short_write_gen<T>(&mut self, x: T) {
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let bytes = unsafe {
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slice::from_raw_parts(&x as *const T as *const u8, mem::size_of::<T>())
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};
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self.short_write(bytes);
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}
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#[inline]
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pub fn finish128(mut self) -> (u64, u64) {
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let b: u64 = ((self.length as u64 & 0xff) << 56) | self.tail;
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self.state.v3 ^= b;
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Sip24Rounds::c_rounds(&mut self.state);
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self.state.v0 ^= b;
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self.state.v2 ^= 0xee;
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Sip24Rounds::d_rounds(&mut self.state);
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let _0 = self.state.v0 ^ self.state.v1 ^ self.state.v2 ^ self.state.v3;
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self.state.v1 ^= 0xdd;
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Sip24Rounds::d_rounds(&mut self.state);
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let _1 = self.state.v0 ^ self.state.v1 ^ self.state.v2 ^ self.state.v3;
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(_0, _1)
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}
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}
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impl Hasher for SipHasher128 {
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#[inline]
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fn write_u8(&mut self, i: u8) {
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self.short_write_gen(i);
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}
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#[inline]
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fn write_u16(&mut self, i: u16) {
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self.short_write_gen(i);
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}
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#[inline]
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fn write_u32(&mut self, i: u32) {
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self.short_write_gen(i);
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}
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#[inline]
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fn write_u64(&mut self, i: u64) {
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self.short_write_gen(i);
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}
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#[inline]
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fn write_usize(&mut self, i: usize) {
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self.short_write_gen(i);
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}
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#[inline]
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fn write_i8(&mut self, i: i8) {
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self.short_write_gen(i);
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}
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#[inline]
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fn write_i16(&mut self, i: i16) {
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self.short_write_gen(i);
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}
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#[inline]
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fn write_i32(&mut self, i: i32) {
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self.short_write_gen(i);
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}
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#[inline]
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fn write_i64(&mut self, i: i64) {
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self.short_write_gen(i);
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}
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#[inline]
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fn write_isize(&mut self, i: isize) {
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self.short_write_gen(i);
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}
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#[inline]
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fn write(&mut self, msg: &[u8]) {
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let length = msg.len();
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self.length += length;
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let mut needed = 0;
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if self.ntail != 0 {
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needed = 8 - self.ntail;
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self.tail |= unsafe { u8to64_le(msg, 0, cmp::min(length, needed)) } << 8 * self.ntail;
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if length < needed {
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self.ntail += length;
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return
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} else {
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self.state.v3 ^= self.tail;
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Sip24Rounds::c_rounds(&mut self.state);
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self.state.v0 ^= self.tail;
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self.ntail = 0;
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}
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}
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// Buffered tail is now flushed, process new input.
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let len = length - needed;
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let left = len & 0x7;
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let mut i = needed;
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while i < len - left {
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let mi = unsafe { load_int_le!(msg, i, u64) };
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self.state.v3 ^= mi;
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Sip24Rounds::c_rounds(&mut self.state);
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self.state.v0 ^= mi;
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i += 8;
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}
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self.tail = unsafe { u8to64_le(msg, i, left) };
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self.ntail = left;
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}
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fn finish(&self) -> u64 {
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panic!("SipHasher128 cannot provide valid 64 bit hashes")
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}
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}
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#[derive(Debug, Clone, Default)]
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struct Sip24Rounds;
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impl Sip24Rounds {
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#[inline]
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fn c_rounds(state: &mut State) {
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compress!(state);
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compress!(state);
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}
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#[inline]
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fn d_rounds(state: &mut State) {
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compress!(state);
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compress!(state);
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compress!(state);
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compress!(state);
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}
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}
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#[cfg(test)]
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mod test {
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use std::hash::{Hash, Hasher};
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use std::{slice, mem};
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use super::SipHasher128;
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// Hash just the bytes of the slice, without length prefix
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struct Bytes<'a>(&'a [u8]);
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impl<'a> Hash for Bytes<'a> {
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#[allow(unused_must_use)]
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fn hash<H: Hasher>(&self, state: &mut H) {
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for byte in self.0 {
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state.write_u8(*byte);
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}
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}
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}
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fn hash_with<T: Hash>(mut st: SipHasher128, x: &T) -> (u64, u64) {
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x.hash(&mut st);
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st.finish128()
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}
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fn hash<T: Hash>(x: &T) -> (u64, u64) {
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hash_with(SipHasher128::new_with_keys(0, 0), x)
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}
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const TEST_VECTOR : [[u8; 16]; 64] = [
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[0xa3,0x81,0x7f,0x04,0xba,0x25,0xa8,0xe6,0x6d,0xf6,0x72,0x14,0xc7,0x55,0x02,0x93],
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[0xda,0x87,0xc1,0xd8,0x6b,0x99,0xaf,0x44,0x34,0x76,0x59,0x11,0x9b,0x22,0xfc,0x45],
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[0x81,0x77,0x22,0x8d,0xa4,0xa4,0x5d,0xc7,0xfc,0xa3,0x8b,0xde,0xf6,0x0a,0xff,0xe4],
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[0x9c,0x70,0xb6,0x0c,0x52,0x67,0xa9,0x4e,0x5f,0x33,0xb6,0xb0,0x29,0x85,0xed,0x51],
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[0xf8,0x81,0x64,0xc1,0x2d,0x9c,0x8f,0xaf,0x7d,0x0f,0x6e,0x7c,0x7b,0xcd,0x55,0x79],
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[0x13,0x68,0x87,0x59,0x80,0x77,0x6f,0x88,0x54,0x52,0x7a,0x07,0x69,0x0e,0x96,0x27],
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[0x14,0xee,0xca,0x33,0x8b,0x20,0x86,0x13,0x48,0x5e,0xa0,0x30,0x8f,0xd7,0xa1,0x5e],
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[0xa1,0xf1,0xeb,0xbe,0xd8,0xdb,0xc1,0x53,0xc0,0xb8,0x4a,0xa6,0x1f,0xf0,0x82,0x39],
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[0x3b,0x62,0xa9,0xba,0x62,0x58,0xf5,0x61,0x0f,0x83,0xe2,0x64,0xf3,0x14,0x97,0xb4],
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[0x26,0x44,0x99,0x06,0x0a,0xd9,0xba,0xab,0xc4,0x7f,0x8b,0x02,0xbb,0x6d,0x71,0xed],
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[0x00,0x11,0x0d,0xc3,0x78,0x14,0x69,0x56,0xc9,0x54,0x47,0xd3,0xf3,0xd0,0xfb,0xba],
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[0x01,0x51,0xc5,0x68,0x38,0x6b,0x66,0x77,0xa2,0xb4,0xdc,0x6f,0x81,0xe5,0xdc,0x18],
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[0xd6,0x26,0xb2,0x66,0x90,0x5e,0xf3,0x58,0x82,0x63,0x4d,0xf6,0x85,0x32,0xc1,0x25],
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[0x98,0x69,0xe2,0x47,0xe9,0xc0,0x8b,0x10,0xd0,0x29,0x93,0x4f,0xc4,0xb9,0x52,0xf7],
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[0x31,0xfc,0xef,0xac,0x66,0xd7,0xde,0x9c,0x7e,0xc7,0x48,0x5f,0xe4,0x49,0x49,0x02],
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[0x54,0x93,0xe9,0x99,0x33,0xb0,0xa8,0x11,0x7e,0x08,0xec,0x0f,0x97,0xcf,0xc3,0xd9],
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[0x6e,0xe2,0xa4,0xca,0x67,0xb0,0x54,0xbb,0xfd,0x33,0x15,0xbf,0x85,0x23,0x05,0x77],
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[0x47,0x3d,0x06,0xe8,0x73,0x8d,0xb8,0x98,0x54,0xc0,0x66,0xc4,0x7a,0xe4,0x77,0x40],
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[0xa4,0x26,0xe5,0xe4,0x23,0xbf,0x48,0x85,0x29,0x4d,0xa4,0x81,0xfe,0xae,0xf7,0x23],
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[0x78,0x01,0x77,0x31,0xcf,0x65,0xfa,0xb0,0x74,0xd5,0x20,0x89,0x52,0x51,0x2e,0xb1],
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[0x9e,0x25,0xfc,0x83,0x3f,0x22,0x90,0x73,0x3e,0x93,0x44,0xa5,0xe8,0x38,0x39,0xeb],
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[0x56,0x8e,0x49,0x5a,0xbe,0x52,0x5a,0x21,0x8a,0x22,0x14,0xcd,0x3e,0x07,0x1d,0x12],
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[0x4a,0x29,0xb5,0x45,0x52,0xd1,0x6b,0x9a,0x46,0x9c,0x10,0x52,0x8e,0xff,0x0a,0xae],
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[0xc9,0xd1,0x84,0xdd,0xd5,0xa9,0xf5,0xe0,0xcf,0x8c,0xe2,0x9a,0x9a,0xbf,0x69,0x1c],
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[0x2d,0xb4,0x79,0xae,0x78,0xbd,0x50,0xd8,0x88,0x2a,0x8a,0x17,0x8a,0x61,0x32,0xad],
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[0x8e,0xce,0x5f,0x04,0x2d,0x5e,0x44,0x7b,0x50,0x51,0xb9,0xea,0xcb,0x8d,0x8f,0x6f],
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[0x9c,0x0b,0x53,0xb4,0xb3,0xc3,0x07,0xe8,0x7e,0xae,0xe0,0x86,0x78,0x14,0x1f,0x66],
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[0xab,0xf2,0x48,0xaf,0x69,0xa6,0xea,0xe4,0xbf,0xd3,0xeb,0x2f,0x12,0x9e,0xeb,0x94],
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[0x06,0x64,0xda,0x16,0x68,0x57,0x4b,0x88,0xb9,0x35,0xf3,0x02,0x73,0x58,0xae,0xf4],
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[0xaa,0x4b,0x9d,0xc4,0xbf,0x33,0x7d,0xe9,0x0c,0xd4,0xfd,0x3c,0x46,0x7c,0x6a,0xb7],
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[0xea,0x5c,0x7f,0x47,0x1f,0xaf,0x6b,0xde,0x2b,0x1a,0xd7,0xd4,0x68,0x6d,0x22,0x87],
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[0x29,0x39,0xb0,0x18,0x32,0x23,0xfa,0xfc,0x17,0x23,0xde,0x4f,0x52,0xc4,0x3d,0x35],
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[0x7c,0x39,0x56,0xca,0x5e,0xea,0xfc,0x3e,0x36,0x3e,0x9d,0x55,0x65,0x46,0xeb,0x68],
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[0x77,0xc6,0x07,0x71,0x46,0xf0,0x1c,0x32,0xb6,0xb6,0x9d,0x5f,0x4e,0xa9,0xff,0xcf],
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[0x37,0xa6,0x98,0x6c,0xb8,0x84,0x7e,0xdf,0x09,0x25,0xf0,0xf1,0x30,0x9b,0x54,0xde],
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[0xa7,0x05,0xf0,0xe6,0x9d,0xa9,0xa8,0xf9,0x07,0x24,0x1a,0x2e,0x92,0x3c,0x8c,0xc8],
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[0x3d,0xc4,0x7d,0x1f,0x29,0xc4,0x48,0x46,0x1e,0x9e,0x76,0xed,0x90,0x4f,0x67,0x11],
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[0x0d,0x62,0xbf,0x01,0xe6,0xfc,0x0e,0x1a,0x0d,0x3c,0x47,0x51,0xc5,0xd3,0x69,0x2b],
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[0x8c,0x03,0x46,0x8b,0xca,0x7c,0x66,0x9e,0xe4,0xfd,0x5e,0x08,0x4b,0xbe,0xe7,0xb5],
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[0x52,0x8a,0x5b,0xb9,0x3b,0xaf,0x2c,0x9c,0x44,0x73,0xcc,0xe5,0xd0,0xd2,0x2b,0xd9],
|
|
[0xdf,0x6a,0x30,0x1e,0x95,0xc9,0x5d,0xad,0x97,0xae,0x0c,0xc8,0xc6,0x91,0x3b,0xd8],
|
|
[0x80,0x11,0x89,0x90,0x2c,0x85,0x7f,0x39,0xe7,0x35,0x91,0x28,0x5e,0x70,0xb6,0xdb],
|
|
[0xe6,0x17,0x34,0x6a,0xc9,0xc2,0x31,0xbb,0x36,0x50,0xae,0x34,0xcc,0xca,0x0c,0x5b],
|
|
[0x27,0xd9,0x34,0x37,0xef,0xb7,0x21,0xaa,0x40,0x18,0x21,0xdc,0xec,0x5a,0xdf,0x89],
|
|
[0x89,0x23,0x7d,0x9d,0xed,0x9c,0x5e,0x78,0xd8,0xb1,0xc9,0xb1,0x66,0xcc,0x73,0x42],
|
|
[0x4a,0x6d,0x80,0x91,0xbf,0x5e,0x7d,0x65,0x11,0x89,0xfa,0x94,0xa2,0x50,0xb1,0x4c],
|
|
[0x0e,0x33,0xf9,0x60,0x55,0xe7,0xae,0x89,0x3f,0xfc,0x0e,0x3d,0xcf,0x49,0x29,0x02],
|
|
[0xe6,0x1c,0x43,0x2b,0x72,0x0b,0x19,0xd1,0x8e,0xc8,0xd8,0x4b,0xdc,0x63,0x15,0x1b],
|
|
[0xf7,0xe5,0xae,0xf5,0x49,0xf7,0x82,0xcf,0x37,0x90,0x55,0xa6,0x08,0x26,0x9b,0x16],
|
|
[0x43,0x8d,0x03,0x0f,0xd0,0xb7,0xa5,0x4f,0xa8,0x37,0xf2,0xad,0x20,0x1a,0x64,0x03],
|
|
[0xa5,0x90,0xd3,0xee,0x4f,0xbf,0x04,0xe3,0x24,0x7e,0x0d,0x27,0xf2,0x86,0x42,0x3f],
|
|
[0x5f,0xe2,0xc1,0xa1,0x72,0xfe,0x93,0xc4,0xb1,0x5c,0xd3,0x7c,0xae,0xf9,0xf5,0x38],
|
|
[0x2c,0x97,0x32,0x5c,0xbd,0x06,0xb3,0x6e,0xb2,0x13,0x3d,0xd0,0x8b,0x3a,0x01,0x7c],
|
|
[0x92,0xc8,0x14,0x22,0x7a,0x6b,0xca,0x94,0x9f,0xf0,0x65,0x9f,0x00,0x2a,0xd3,0x9e],
|
|
[0xdc,0xe8,0x50,0x11,0x0b,0xd8,0x32,0x8c,0xfb,0xd5,0x08,0x41,0xd6,0x91,0x1d,0x87],
|
|
[0x67,0xf1,0x49,0x84,0xc7,0xda,0x79,0x12,0x48,0xe3,0x2b,0xb5,0x92,0x25,0x83,0xda],
|
|
[0x19,0x38,0xf2,0xcf,0x72,0xd5,0x4e,0xe9,0x7e,0x94,0x16,0x6f,0xa9,0x1d,0x2a,0x36],
|
|
[0x74,0x48,0x1e,0x96,0x46,0xed,0x49,0xfe,0x0f,0x62,0x24,0x30,0x16,0x04,0x69,0x8e],
|
|
[0x57,0xfc,0xa5,0xde,0x98,0xa9,0xd6,0xd8,0x00,0x64,0x38,0xd0,0x58,0x3d,0x8a,0x1d],
|
|
[0x9f,0xec,0xde,0x1c,0xef,0xdc,0x1c,0xbe,0xd4,0x76,0x36,0x74,0xd9,0x57,0x53,0x59],
|
|
[0xe3,0x04,0x0c,0x00,0xeb,0x28,0xf1,0x53,0x66,0xca,0x73,0xcb,0xd8,0x72,0xe7,0x40],
|
|
[0x76,0x97,0x00,0x9a,0x6a,0x83,0x1d,0xfe,0xcc,0xa9,0x1c,0x59,0x93,0x67,0x0f,0x7a],
|
|
[0x58,0x53,0x54,0x23,0x21,0xf5,0x67,0xa0,0x05,0xd5,0x47,0xa4,0xf0,0x47,0x59,0xbd],
|
|
[0x51,0x50,0xd1,0x77,0x2f,0x50,0x83,0x4a,0x50,0x3e,0x06,0x9a,0x97,0x3f,0xbd,0x7c],
|
|
];
|
|
|
|
// Test vector from reference implementation
|
|
#[test]
|
|
fn test_siphash_2_4_test_vector() {
|
|
let k0 = 0x_07_06_05_04_03_02_01_00;
|
|
let k1 = 0x_0f_0e_0d_0c_0b_0a_09_08;
|
|
|
|
let mut input: Vec<u8> = Vec::new();
|
|
|
|
for i in 0 .. 64 {
|
|
let out = hash_with(SipHasher128::new_with_keys(k0, k1),
|
|
&Bytes(&input[..]));
|
|
let expected = (
|
|
((TEST_VECTOR[i][0] as u64) << 0) |
|
|
((TEST_VECTOR[i][1] as u64) << 8) |
|
|
((TEST_VECTOR[i][2] as u64) << 16) |
|
|
((TEST_VECTOR[i][3] as u64) << 24) |
|
|
((TEST_VECTOR[i][4] as u64) << 32) |
|
|
((TEST_VECTOR[i][5] as u64) << 40) |
|
|
((TEST_VECTOR[i][6] as u64) << 48) |
|
|
((TEST_VECTOR[i][7] as u64) << 56),
|
|
|
|
((TEST_VECTOR[i][8] as u64) << 0) |
|
|
((TEST_VECTOR[i][9] as u64) << 8) |
|
|
((TEST_VECTOR[i][10] as u64) << 16) |
|
|
((TEST_VECTOR[i][11] as u64) << 24) |
|
|
((TEST_VECTOR[i][12] as u64) << 32) |
|
|
((TEST_VECTOR[i][13] as u64) << 40) |
|
|
((TEST_VECTOR[i][14] as u64) << 48) |
|
|
((TEST_VECTOR[i][15] as u64) << 56),
|
|
);
|
|
|
|
assert_eq!(out, expected);
|
|
input.push(i as u8);
|
|
}
|
|
}
|
|
|
|
#[test] #[cfg(target_arch = "arm")]
|
|
fn test_hash_usize() {
|
|
let val = 0xdeadbeef_deadbeef_u64;
|
|
assert!(hash(&(val as u64)) != hash(&(val as usize)));
|
|
assert_eq!(hash(&(val as u32)), hash(&(val as usize)));
|
|
}
|
|
#[test] #[cfg(target_arch = "x86_64")]
|
|
fn test_hash_usize() {
|
|
let val = 0xdeadbeef_deadbeef_u64;
|
|
assert_eq!(hash(&(val as u64)), hash(&(val as usize)));
|
|
assert!(hash(&(val as u32)) != hash(&(val as usize)));
|
|
}
|
|
#[test] #[cfg(target_arch = "x86")]
|
|
fn test_hash_usize() {
|
|
let val = 0xdeadbeef_deadbeef_u64;
|
|
assert!(hash(&(val as u64)) != hash(&(val as usize)));
|
|
assert_eq!(hash(&(val as u32)), hash(&(val as usize)));
|
|
}
|
|
|
|
#[test]
|
|
fn test_hash_idempotent() {
|
|
let val64 = 0xdeadbeef_deadbeef_u64;
|
|
assert_eq!(hash(&val64), hash(&val64));
|
|
let val32 = 0xdeadbeef_u32;
|
|
assert_eq!(hash(&val32), hash(&val32));
|
|
}
|
|
|
|
#[test]
|
|
fn test_hash_no_bytes_dropped_64() {
|
|
let val = 0xdeadbeef_deadbeef_u64;
|
|
|
|
assert!(hash(&val) != hash(&zero_byte(val, 0)));
|
|
assert!(hash(&val) != hash(&zero_byte(val, 1)));
|
|
assert!(hash(&val) != hash(&zero_byte(val, 2)));
|
|
assert!(hash(&val) != hash(&zero_byte(val, 3)));
|
|
assert!(hash(&val) != hash(&zero_byte(val, 4)));
|
|
assert!(hash(&val) != hash(&zero_byte(val, 5)));
|
|
assert!(hash(&val) != hash(&zero_byte(val, 6)));
|
|
assert!(hash(&val) != hash(&zero_byte(val, 7)));
|
|
|
|
fn zero_byte(val: u64, byte: usize) -> u64 {
|
|
assert!(byte < 8);
|
|
val & !(0xff << (byte * 8))
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_hash_no_bytes_dropped_32() {
|
|
let val = 0xdeadbeef_u32;
|
|
|
|
assert!(hash(&val) != hash(&zero_byte(val, 0)));
|
|
assert!(hash(&val) != hash(&zero_byte(val, 1)));
|
|
assert!(hash(&val) != hash(&zero_byte(val, 2)));
|
|
assert!(hash(&val) != hash(&zero_byte(val, 3)));
|
|
|
|
fn zero_byte(val: u32, byte: usize) -> u32 {
|
|
assert!(byte < 4);
|
|
val & !(0xff << (byte * 8))
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_hash_no_concat_alias() {
|
|
let s = ("aa", "bb");
|
|
let t = ("aabb", "");
|
|
let u = ("a", "abb");
|
|
|
|
assert!(s != t && t != u);
|
|
assert!(hash(&s) != hash(&t) && hash(&s) != hash(&u));
|
|
|
|
let u = [1, 0, 0, 0];
|
|
let v = (&u[..1], &u[1..3], &u[3..]);
|
|
let w = (&u[..], &u[4..4], &u[4..4]);
|
|
|
|
assert!(v != w);
|
|
assert!(hash(&v) != hash(&w));
|
|
}
|
|
|
|
#[test]
|
|
fn test_write_short_works() {
|
|
let test_usize = 0xd0c0b0a0usize;
|
|
let mut h1 = SipHasher128::new_with_keys(0, 0);
|
|
h1.write_usize(test_usize);
|
|
h1.write(b"bytes");
|
|
h1.write(b"string");
|
|
h1.write_u8(0xFFu8);
|
|
h1.write_u8(0x01u8);
|
|
let mut h2 = SipHasher128::new_with_keys(0, 0);
|
|
h2.write(unsafe {
|
|
slice::from_raw_parts(&test_usize as *const _ as *const u8,
|
|
mem::size_of::<usize>())
|
|
});
|
|
h2.write(b"bytes");
|
|
h2.write(b"string");
|
|
h2.write(&[0xFFu8, 0x01u8]);
|
|
assert_eq!(h1.finish128(), h2.finish128());
|
|
}
|
|
|
|
}
|