org.bouncycastle.tls.crypto.impl.jcajce.JcaTlsRSAPSSVerifier 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 java.security.spec.AlgorithmParameterSpec;

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

/**
 * Operator supporting the verification of RSASSA-PSS signatures.
 */
public class JcaTlsRSAPSSVerifier
    implements TlsVerifier
{
    private final JcaTlsCrypto crypto;
    private final PublicKey publicKey;
    private final short signatureAlgorithm;

    public JcaTlsRSAPSSVerifier(JcaTlsCrypto crypto, PublicKey publicKey, short signatureAlgorithm)
    {
        if (null == crypto)
        {
            throw new NullPointerException("crypto");
        }
        if (null == publicKey)
        {
            throw new NullPointerException("publicKey");
        }
        if (!SignatureAlgorithm.isRSAPSS(signatureAlgorithm))
        {
            throw new IllegalArgumentException("signatureAlgorithm");
        }

        this.crypto = crypto;
        this.publicKey = publicKey;
        this.signatureAlgorithm = signatureAlgorithm;
    }

    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() != signatureAlgorithm
            || algorithm.getHash() != HashAlgorithm.Intrinsic)
        {
            throw new IllegalStateException();
        }

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

        short hash = SignatureAlgorithm.getRSAPSSHashAlgorithm(signatureAlgorithm);
        String digestName = crypto.getDigestName(hash);
        String sigName = RSAUtil.getDigestSigAlgName(digestName) + "WITHRSAANDMGF1";

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

            AlgorithmParameterSpec pssSpec = RSAUtil.getPSSParameterSpec(hash, digestName, crypto.getHelper());

            // NOTE: We explicitly set them even though they should be the defaults, because providers vary
            verifier.setParameter(pssSpec);

            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(sigName + " verification failed", e);
        }
    }
}