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The Bouncy Castle Java APIs for the TLS, including a JSSE provider. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.tls;

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(HashAlgorithm.md5);
        this.sha1 = crypto.createHash(HashAlgorithm.sha1);
    }

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

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

    public byte[] calculateHash()
    {
        return Arrays.concatenate(md5.calculateHash(), sha1.calculateHash());
    }

    public Object clone()
    {
        return new CombinedHash(this);
    }

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