)

//go:linkname runtime_rand runtime.rand
func runtime_rand() uint64

//go:linkname runtime_memhash runtime.memhash
//go:noescape
func runtime_memhash(p unsafe.Pointer, seed, s uintptr) uintptr

func rthash(buf []byte, seed uint64) uint64 {
	if len(buf) == 0 {
		return seed
	}
	len := len(buf)
	// The runtime hasher only works on uintptr. For 64-bit
	// architectures, we use the hasher directly. Otherwise,

//go:build purego

package maphash

import (
	"crypto/rand"
	"internal/byteorder"
	"math/bits"
)

func rthash(buf []byte, seed uint64) uint64 {
	if len(buf) == 0 {
		return seed
	}
	return wyhash(buf, seed, uint64(len(buf)))
}

func rthashString(s string, state uint64) uint64 {
	return rthash([]byte(s), state)
}

func randUint64() uint64 {
	buf := make([]byte, 8)
	_, _ = rand.Read(buf)

}

// A Hash computes a seeded hash of a byte sequence.
//
// The zero Hash is a valid Hash ready to use.
// A zero Hash chooses a random seed for itself during
// the first call to a Reset, Write, Seed, or Sum64 method.
// For control over the seed, use SetSeed.
//
// The computed hash values depend only on the initial seed and
// the sequence of bytes provided to the Hash object, not on the way

            dstIndex += blob.length;
        } else {
            System.arraycopy( lmHash, 0, dst, dstIndex, lmHash.length );
            dstIndex += lmHash.length;
            System.arraycopy( ntHash, 0, dst, dstIndex, ntHash.length );
            dstIndex += ntHash.length;
    
            dstIndex += writeString( accountName, dst, dstIndex );

            dstIndex += this.blob.length;
        }
        else {
            System.arraycopy(this.lmHash, 0, dst, dstIndex, this.lmHash.length);
            dstIndex += this.lmHash.length;
            System.arraycopy(this.ntHash, 0, dst, dstIndex, this.ntHash.length);
            dstIndex += this.ntHash.length;

            dstIndex += writeString(this.accountName, dst, dstIndex);

		hhHash, err := strconv.ParseUint(string(hhHashBytes), 16, 64)
		if err != nil {
			t.Fatalf("could not parse hash %q: %v", hhHashBytes, err)
		}

		var xh xxhash64
		xh.reset()
		xh.update(b)
		goHash := xh.digest()

		if goHash != hhHash {
			t.Errorf("Go hash %#x != xxhsum hash %#x", goHash, hhHash)
		}
	})

        return doHash(inputStream, outputStream);
    }

    private HashCode doHash(InputStream inputStream, OutputStream outputStream) throws IOException {
        byte[] buffer = takeBuffer();
        try {
            PrimitiveHasher hasher = Hashing.newPrimitiveHasher();
            hasher.putHash(SIGNATURE);
            while (true) {
                int nread = inputStream.read(buffer);

            }
            Hasher hasher = Hashing.newHasher();
            hasher.putHash(DIR_SIGNATURE);
            for (FileSystemLocationSnapshot child : children) {
                hasher.putString(child.getName());
                hasher.putHash(child.getHash());
            }
            return new DirectorySnapshot(absolutePath, name, accessType, hasher.hash(), children);
        }
    }

	xxhPrime64c5 = 0x27d4eb2f165667c5
)

// xxhash64 is the state of a xxHash-64 checksum.
type xxhash64 struct {
	len uint64    // total length hashed
	v   [4]uint64 // accumulators
	buf [32]byte  // buffer
	cnt int       // number of bytes in buffer
}

// reset discards the current state and prepares to compute a new hash.
// We assume a seed of 0 since that is what zstd uses.
func (xh *xxhash64) reset() {

     *            NT password hash
     */
    public NtlmNtHashAuthenticator ( String domain, String username, byte[] passwordHash ) {
        super(domain, username, null, AuthenticationType.USER);
        if ( passwordHash == null || passwordHash.length != 16 ) {
            throw new IllegalArgumentException("Password hash must be provided, expected length 16 byte");
        }
        this.ntHash = passwordHash;
    }


    /**