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

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.TlsSigner;
import org.bouncycastle.tls.crypto.TlsStreamSigner;

/**
 * Operator supporting the generation of RSASSA-PSS signatures.
 */
public class JcaTlsRSAPSSSigner
    implements TlsSigner
{
    private final JcaTlsCrypto crypto;
    private final PrivateKey privateKey;
    private final short signatureAlgorithm;

    public JcaTlsRSAPSSSigner(JcaTlsCrypto crypto, PrivateKey privateKey, short signatureAlgorithm)
    {
        if (null == crypto)
        {
            throw new NullPointerException("crypto");
        }
        if (null == privateKey)
        {
            throw new NullPointerException("privateKey");
        }
        if (!SignatureAlgorithm.isRSAPSS(signatureAlgorithm))
        {
            throw new IllegalArgumentException("signatureAlgorithm");
        }

        this.crypto = crypto;
        this.privateKey = privateKey;
        this.signatureAlgorithm = signatureAlgorithm;
    }

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

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

        short hash = SignatureAlgorithm.getRSAPSSHashAlgorithm(signatureAlgorithm);
        String digestName = crypto.getDigestName(hash);

        String sigName = RSAUtil.getDigestSigAlgName(digestName) + "WITHRSAANDMGF1";

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

            final Signature sig = crypto.getHelper().createSignature(sigName);

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

            sig.initSign(privateKey, crypto.getSecureRandom());

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