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The Bouncy Castle Java APIs for TLS and DTLS.

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package org.bouncycastle.tls;

import org.bouncycastle.tls.crypto.CryptoHashAlgorithm;
import org.bouncycastle.tls.crypto.TlsCrypto;
import org.bouncycastle.tls.crypto.TlsHash;
import org.bouncycastle.util.Arrays;

/**
 * A combined hash, which implements md5(m) || sha1(m).
 */
public class CombinedHash
    implements TlsHash
{
    protected TlsContext context;
    protected TlsCrypto crypto;
    protected TlsHash md5;
    protected TlsHash sha1;

    CombinedHash(TlsContext context, TlsHash md5, TlsHash sha1)
    {
        this.context = context;
        this.crypto = context.getCrypto();
        this.md5 = md5;
        this.sha1 = sha1;
    }

    public CombinedHash(TlsCrypto crypto)
    {
        this.crypto = crypto;
        this.md5 = crypto.createHash(CryptoHashAlgorithm.md5);
        this.sha1 = crypto.createHash(CryptoHashAlgorithm.sha1);
    }

    public CombinedHash(CombinedHash t)
    {
        this.context = t.context;
        this.crypto = t.crypto;
        this.md5 = t.md5.cloneHash();
        this.sha1 = t.sha1.cloneHash();
    }

    public void update(byte[] input, int inOff, int len)
    {
        md5.update(input, inOff, len);
        sha1.update(input, inOff, len);
    }

    public byte[] calculateHash()
    {
        if (null != context && TlsUtils.isSSL(context))
        {
            SSL3Utils.completeCombinedHash(context, md5, sha1);
        }

        return Arrays.concatenate(md5.calculateHash(), sha1.calculateHash());
    }

    public TlsHash cloneHash()
    {
        return new CombinedHash(this);
    }

    public void reset()
    {
        md5.reset();
        sha1.reset();
    }
}