org.bouncycastle.tls.crypto.impl.jcajce.JcaTlsEdDSASigner 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.crypto.impl.jcajce;

import java.io.IOException;
import java.io.OutputStream;
import java.security.GeneralSecurityException;
import java.security.PrivateKey;
import java.security.Signature;
import java.security.SignatureException;

import org.bouncycastle.tls.HashAlgorithm;
import org.bouncycastle.tls.SignatureAndHashAlgorithm;
import org.bouncycastle.tls.crypto.TlsCryptoException;
import org.bouncycastle.tls.crypto.TlsSigner;
import org.bouncycastle.tls.crypto.TlsStreamSigner;

public abstract class JcaTlsEdDSASigner
    implements TlsSigner
{
    protected final JcaTlsCrypto crypto;
    protected final PrivateKey privateKey;
    protected final short algorithmType;
    protected final String algorithmName;

    public JcaTlsEdDSASigner(JcaTlsCrypto crypto, PrivateKey privateKey, short algorithmType, String algorithmName)
    {
        if (null == crypto)
        {
            throw new NullPointerException("crypto");
        }
        if (null == privateKey)
        {
            throw new NullPointerException("privateKey");
        }

        this.crypto = crypto;
        this.privateKey = privateKey;
        this.algorithmType = algorithmType;
        this.algorithmName = algorithmName;
    }

    public byte[] generateRawSignature(SignatureAndHashAlgorithm algorithm, byte[] hash) throws IOException
    {
        throw new UnsupportedOperationException();
    }

    public TlsStreamSigner getStreamSigner(SignatureAndHashAlgorithm algorithm) throws IOException
    {
        if (algorithm == null
            || algorithm.getSignature() != algorithmType
            || algorithm.getHash() != HashAlgorithm.Intrinsic)
        {
            throw new IllegalStateException();
        }

        try
        {
            final Signature sig = crypto.getHelper().createSignature(algorithmName);

            sig.initSign(privateKey);

            final OutputStream stream = OutputStreamFactory.createStream(sig);

            return new TlsStreamSigner()
            {
                public OutputStream getOutputStream() throws IOException
                {
                    return stream;
                }

                public byte[] getSignature() throws IOException
                {
                    try
                    {
                        return sig.sign();
                    }
                    catch (SignatureException e)
                    {
                        throw new IOException(e.getMessage());
                    }
                }
            };
        }
        catch (GeneralSecurityException e)
        {
            throw new TlsCryptoException(algorithmName + " signature failed", e);
        }
    }
}