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JNano provides a set of low level Nano operations that includes signing, seed generation, block hashing and account creation.

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package com.rotilho.jnano.commons;

import com.rfksystems.blake2b.Blake2b;

import java.util.stream.Stream;

import static java.util.Objects.requireNonNull;

final class Hashes {
    private static final int DIGEST_256 = 256 / 8;

    private Hashes() {
    }

    public static byte[] digest256(byte[]... bytes) {
        return digest(DIGEST_256, bytes);
    }

    public static byte[] digest(int digestSize, byte[]... byteArrays) {
        requireNonNull(byteArrays, "Byte Arrays can't be null");

        Blake2b blake2b = new Blake2b(null, digestSize, null, null);

        Stream.of(byteArrays).forEach(byteArray -> blake2b.update(byteArray, 0, byteArray.length));

        byte[] output = new byte[digestSize];
        blake2b.digest(output, 0);
        return output;
    }
}