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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.crypto.impl.jcajce;

import java.security.MessageDigest;

import org.bouncycastle.tls.crypto.TlsHash;

/**
 * Wrapper class for providing support methods for a TlsHash based on the JCA MessageDigest class.
 */
public class JcaTlsHash
    implements TlsHash
{
    private final MessageDigest digest;

    public JcaTlsHash(MessageDigest digest)
    {
        this.digest = digest;
    }

    public void update(byte[] data, int offSet, int length)
    {
        digest.update(data, offSet, length);
    }

    public byte[] calculateHash()
    {
        return digest.digest();
    }

    public Object clone()
    {
        try
        {
            return new JcaTlsHash((MessageDigest)digest.clone());
        }
        catch (CloneNotSupportedException e)
        {
            throw new UnsupportedOperationException("unable to clone digest");
        }
    }

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