Example usage for com.google.common.hash Hashing sipHash24

Introduction

In this page you can find the example usage for com.google.common.hash Hashing sipHash24.

Prototype

public static HashFunction sipHash24(long k0, long k1) 

Source Link

Document

Returns a hash function implementing the <a href="https://131002.net/siphash/">64-bit SipHash-2-4 algorithm</a> using the given seed.

Usage

From source file:com.scurrilous.circe.guava.GuavaHashProvider.java

@Override
protected Hash get(HashParameters params, EnumSet<HashSupport> required) {
    if (params instanceof SipHash24Parameters) {
        final SipHash24Parameters sipParams = (SipHash24Parameters) params;
        return new HasherLongHash(Hashing.sipHash24(sipParams.seedLow(), sipParams.seedHigh()),
                params.algorithm());//w w w .j  a  v a 2s.c  o  m
    }
    if (params instanceof MurmurHash3Parameters) {
        final MurmurHash3Parameters murmurParams = (MurmurHash3Parameters) params;
        final int seed = murmurParams.seed();
        switch (murmurParams.variant()) {
        case X86_32:
            return new HasherIntHash(Hashing.murmur3_32(seed), params.algorithm());
        case X64_128:
            return new HasherHash(Hashing.murmur3_128(seed), params.algorithm());
        default:
            throw new UnsupportedOperationException();
        }
    }
    throw new UnsupportedOperationException();
}

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From source file:com.github.mgunlogson.cuckoofilter4j.SerializableSaltedHasher.java

private static HashFunction configureHash(Algorithm alg, long seedNSalt, long addlSipSeed) {
    switch (alg) {
    case xxHash64:
        return new xxHashFunction(seedNSalt);
    case Murmur3_128:
        return Hashing.murmur3_128((int) seedNSalt);
    case Murmur3_32:
        return Hashing.murmur3_32((int) seedNSalt);
    case sha256:/*from www  .  j  a  v a 2 s  .com*/
        return Hashing.sha1();
    case sipHash24:
        return Hashing.sipHash24(seedNSalt, addlSipSeed);
    default:
        throw new IllegalArgumentException("Invalid Enum Hashing Algorithm???");
    }
}

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From source file:diskCacheV111.srm.dcache.CanonicalizingByteArrayStore.java

/**
 * Returns a {@code Token} for a particular byte array.
 *
 * As long as the token is referenced, the byte array is not eligible
 * for garbage collection.//www . j a  va 2s .com
 *
 * The byte array ID can be extracted from the token.
 *
 * @param bytes a byte array
 * @return A {@code Token} referencing the given byte array
 */
@Nonnull
public Token toToken(byte[] bytes) {
    Token token = null;
    long k1 = 0x00;
    do {
        HashCode hash = Hashing.sipHash24(K0, k1++).hashBytes(bytes);
        long id = hash.asLong();
        Lock lock = locks.get(id);
        lock.lock();
        try {
            byte[] canonical = load(id);
            if (canonical == null) {
                save(id, bytes);
                token = makeToken(id);
            } else if (Arrays.equals(bytes, canonical)) {
                token = makeToken(id);
            }
        } finally {
            lock.unlock();
        }
    } while (token == null);
    return token;
}

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