org.bouncycastle.tls.crypto.impl.jcajce.JcaTlsDSAVerifier 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.security.GeneralSecurityException;
import java.security.Signature;
import java.security.interfaces.DSAPublicKey;

import org.bouncycastle.jcajce.util.JcaJceHelper;
import org.bouncycastle.tls.DigitallySigned;
import org.bouncycastle.tls.SignatureAlgorithm;
import org.bouncycastle.tls.SignatureAndHashAlgorithm;
import org.bouncycastle.tls.crypto.TlsStreamVerifier;
import org.bouncycastle.tls.crypto.TlsVerifier;

/**
 * Implementation class for the verification of the raw DSA signature type using the JCA.
 */
public class JcaTlsDSAVerifier
    implements TlsVerifier
{
    private final JcaJceHelper helper;
    private final DSAPublicKey pubKey;

    protected JcaTlsDSAVerifier(DSAPublicKey pubKey, JcaJceHelper helper)
    {
        if (pubKey == null)
        {
            throw new IllegalArgumentException("'pubKey' cannot be null");
        }

        this.pubKey = pubKey;
        this.helper = helper;
    }

    public TlsStreamVerifier getStreamVerifier(DigitallySigned signature)
    {
        return null;
    }

    public boolean verifyRawSignature(DigitallySigned signedParams, byte[] hash)
    {
        SignatureAndHashAlgorithm algorithm = signedParams.getAlgorithm();
        if (algorithm != null && algorithm.getSignature() != SignatureAlgorithm.dsa)
        {
            throw new IllegalStateException();
        }

        try
        {
            Signature signer = helper.createSignature("NoneWithDSA");

            signer.initVerify(pubKey);
            if (algorithm == null)
            {
                // Note: Only use the SHA1 part of the (MD5/SHA1) hash
                signer.update(hash, 16, 20);
            }
            else
            {
                signer.update(hash, 0, hash.length);
            }
            return signer.verify(signedParams.getSignature());
        }
        catch (GeneralSecurityException e)
        {
            throw new IllegalStateException("unable to process signature: " + e.getMessage(), e);
        }
    }
}