org.bouncycastle.tls.CertificateVerify Maven / Gradle / Ivy

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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;

public final class CertificateVerify
{
    private final int algorithm;
    private final byte[] signature;

    public CertificateVerify(int algorithm, byte[] signature)
    {
        if (!TlsUtils.isValidUint16(algorithm))
        {
            throw new IllegalArgumentException("'algorithm'");
        }
        if (signature == null)
        {
            throw new NullPointerException("'signature' cannot be null");
        }

        this.algorithm = algorithm;
        this.signature = signature;
    }

    /**
     * @return the algorithm (a signature scheme)
     * @see SignatureScheme
     */
    public int getAlgorithm()
    {
        return algorithm;
    }

    public byte[] getSignature()
    {
        return signature;
    }

    /**
     * Encode this {@link CertificateVerify} to an {@link OutputStream}.
     * 
     * @param output
     *            the {@link OutputStream} to encode to.
     * @throws IOException
     */
    public void encode(OutputStream output) throws IOException
    {
        TlsUtils.writeUint16(algorithm, output);
        TlsUtils.writeOpaque16(signature, output);
    }

    /**
     * Parse a {@link CertificateVerify} from an {@link InputStream}.
     * 
     * @param context
     *            the {@link TlsContext} of the current connection.
     * @param input
     *            the {@link InputStream} to parse from.
     * @return a {@link CertificateVerify} object.
     * @throws IOException
     */
    public static CertificateVerify parse(TlsContext context, InputStream input) throws IOException
    {
        if (!TlsUtils.isTLSv13(context))
        {
            throw new IllegalStateException();
        }

        int algorithm = TlsUtils.readUint16(input);
        byte[] signature = TlsUtils.readOpaque16(input);
        return new CertificateVerify(algorithm, signature);
    }
}