52 lines
1.4 KiB
Rust
52 lines
1.4 KiB
Rust
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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Generic hashing support.
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pub use core_collections::hash::{Hash, Hasher, Writer, hash, sip};
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use default::Default;
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use rand::Rng;
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use rand;
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/// `RandomSipHasher` computes the SipHash algorithm from a stream of bytes
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/// initialized with random keys.
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#[deriving(Clone)]
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pub struct RandomSipHasher {
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hasher: sip::SipHasher,
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}
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impl RandomSipHasher {
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/// Construct a new `RandomSipHasher` that is initialized with random keys.
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#[inline]
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pub fn new() -> RandomSipHasher {
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let mut r = rand::task_rng();
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let r0 = r.gen();
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let r1 = r.gen();
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RandomSipHasher {
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hasher: sip::SipHasher::new_with_keys(r0, r1),
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}
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}
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}
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impl Hasher<sip::SipState> for RandomSipHasher {
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#[inline]
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fn hash<T: Hash<sip::SipState>>(&self, value: &T) -> u64 {
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self.hasher.hash(value)
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}
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}
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impl Default for RandomSipHasher {
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#[inline]
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fn default() -> RandomSipHasher {
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RandomSipHasher::new()
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}
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}
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