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The Long Term Stable (LTS) Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains the JCA/JCE provider and low-level API for the BC LTS version 2.73.7 for Java 8 and later.

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package org.bouncycastle.jcajce.provider.digest;

import java.security.DigestException;
import java.security.MessageDigest;

import org.bouncycastle.crypto.Digest;

public class BCMessageDigest
    extends MessageDigest
{
    protected Digest  digest;
    protected int     digestSize;

    protected BCMessageDigest(
        Digest digest)
    {
        super(digest.getAlgorithmName());

        this.digest = digest;
        this.digestSize = digest.getDigestSize();
    }

    public void engineReset() 
    {
        digest.reset();
    }

    public void engineUpdate(
        byte    input) 
    {
        digest.update(input);
    }

    public void engineUpdate(
        byte[]  input,
        int     offset,
        int     len) 
    {
        digest.update(input, offset, len);
    }

    public int engineGetDigestLength()
    {
        return digestSize;
    }

    public byte[] engineDigest() 
    {
        byte[]  digestBytes = new byte[digestSize];

        digest.doFinal(digestBytes, 0);

        return digestBytes;
    }

    public int engineDigest(byte[] buf, int off, int len) throws DigestException
    {
        if (len < digestSize)
            throw new DigestException("partial digests not returned");
        if (buf.length - off < digestSize)
            throw new DigestException("insufficient space in the output buffer to store the digest");

        digest.doFinal(buf, off);

        return digestSize;
    }
}