org.bouncycastle.tls.crypto.impl.jcajce.JcaTlsEdDSAVerifier 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.PublicKey;
import java.security.Signature;
import java.security.SignatureException;

import org.bouncycastle.tls.DigitallySigned;
import org.bouncycastle.tls.HashAlgorithm;
import org.bouncycastle.tls.SignatureAndHashAlgorithm;
import org.bouncycastle.tls.crypto.TlsCryptoException;
import org.bouncycastle.tls.crypto.TlsStreamVerifier;
import org.bouncycastle.tls.crypto.TlsVerifier;

public class JcaTlsEdDSAVerifier
    implements TlsVerifier
{
    protected final JcaTlsCrypto crypto;
    protected final PublicKey publicKey;
    protected final short algorithmType;
    protected final String algorithmName;

    public JcaTlsEdDSAVerifier(JcaTlsCrypto crypto, PublicKey publicKey, short algorithmType, String algorithmName)
    {
        if (null == crypto)
        {
            throw new NullPointerException("crypto");
        }
        if (null == publicKey)
        {
            throw new NullPointerException("publicKey");
        }

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

    public boolean verifyRawSignature(DigitallySigned signature, byte[] hash) throws IOException
    {
        throw new UnsupportedOperationException();
    }

    public TlsStreamVerifier getStreamVerifier(DigitallySigned signature) throws IOException
    {
        SignatureAndHashAlgorithm algorithm = signature.getAlgorithm();
        if (algorithm == null
            || algorithm.getSignature() != algorithmType
            || algorithm.getHash() != HashAlgorithm.Intrinsic)
        {
            throw new IllegalStateException();
        }

        final byte[] sig = signature.getSignature();

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

            verifier.initVerify(publicKey);

            final OutputStream stream = OutputStreamFactory.createStream(verifier);

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

                public boolean isVerified() throws IOException
                {
                    try
                    {
                        return verifier.verify(sig);
                    }
                    catch (SignatureException e)
                    {
                        throw new IOException(e.getMessage());
                    }
                }
            };
        }
        catch (GeneralSecurityException e)
        {
            throw new TlsCryptoException(algorithmName + " verification failed", e);
        }
    }
}