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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 java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * RFC 5246 7.4.1.4.1
 */
public class SignatureAndHashAlgorithm
{
    protected short hash;
    protected short signature;

    /**
     * @param hash      {@link HashAlgorithm}
     * @param signature {@link SignatureAlgorithm}
     */
    public SignatureAndHashAlgorithm(short hash, short signature)
    {
        if (!TlsUtils.isValidUint8(hash))
        {
            throw new IllegalArgumentException("'hash' should be a uint8");
        }
        if (!TlsUtils.isValidUint8(signature))
        {
            throw new IllegalArgumentException("'signature' should be a uint8");
        }
        if (signature == SignatureAlgorithm.anonymous)
        {
            throw new IllegalArgumentException("'signature' MUST NOT be \"anonymous\"");
        }

        this.hash = hash;
        this.signature = signature;
    }

    /**
     * @return {@link HashAlgorithm}
     */
    public short getHash()
    {
        return hash;
    }

    /**
     * @return {@link SignatureAlgorithm}
     */
    public short getSignature()
    {
        return signature;
    }

    public boolean equals(Object obj)
    {
        if (!(obj instanceof SignatureAndHashAlgorithm))
        {
            return false;
        }
        SignatureAndHashAlgorithm other = (SignatureAndHashAlgorithm)obj;
        return other.getHash() == getHash() && other.getSignature() == getSignature();
    }

    public int hashCode()
    {
        return (getHash() << 16) | getSignature();
    }

    /**
     * Encode this {@link SignatureAndHashAlgorithm} to an {@link OutputStream}.
     *
     * @param output the {@link OutputStream} to encode to.
     * @throws IOException
     */
    public void encode(OutputStream output)
        throws IOException
    {
        TlsUtils.writeUint8(getHash(), output);
        TlsUtils.writeUint8(getSignature(), output);
    }

    /**
     * Parse a {@link SignatureAndHashAlgorithm} from an {@link InputStream}.
     *
     * @param input the {@link InputStream} to parse from.
     * @return a {@link SignatureAndHashAlgorithm} object.
     * @throws IOException
     */
    public static SignatureAndHashAlgorithm parse(InputStream input)
        throws IOException
    {
        short hash = TlsUtils.readUint8(input);
        short signature = TlsUtils.readUint8(input);
        return new SignatureAndHashAlgorithm(hash, signature);
    }
}