org.bouncycastle.tls.crypto.impl.jcajce.JcaTlsECDSA13Signer 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.security.GeneralSecurityException;
import java.security.PrivateKey;
import java.security.Signature;

import org.bouncycastle.tls.AlertDescription;
import org.bouncycastle.tls.SignatureAndHashAlgorithm;
import org.bouncycastle.tls.SignatureScheme;
import org.bouncycastle.tls.TlsFatalAlert;
import org.bouncycastle.tls.crypto.TlsSigner;
import org.bouncycastle.tls.crypto.TlsStreamSigner;

/**
 * Implementation class for generation of ECDSA signatures in TLS 1.3+ using the JCA.
 */
public class JcaTlsECDSA13Signer
    implements TlsSigner
{
    private final JcaTlsCrypto crypto;
    private final PrivateKey privateKey;
    private final int signatureScheme;

    public JcaTlsECDSA13Signer(JcaTlsCrypto crypto, PrivateKey privateKey, int signatureScheme)
    {
        if (null == crypto)
        {
            throw new NullPointerException("crypto");
        }
        if (null == privateKey)
        {
            throw new NullPointerException("privateKey");
        }
        if (!SignatureScheme.isECDSA(signatureScheme))
        {
            throw new IllegalArgumentException("signatureScheme");
        }

        this.crypto = crypto;
        this.privateKey = privateKey;
        this.signatureScheme = signatureScheme;
    }

    public byte[] generateRawSignature(SignatureAndHashAlgorithm algorithm, byte[] hash)
        throws IOException
    {
        if (algorithm == null || SignatureScheme.from(algorithm) != signatureScheme)
        {
            throw new IllegalStateException("Invalid algorithm: " + algorithm);
        }

        try
        {
            Signature signer = crypto.getHelper().createSignature("NoneWithECDSA");
            signer.initSign(privateKey, crypto.getSecureRandom());
            signer.update(hash, 0, hash.length);
            return signer.sign();
        }
        catch (GeneralSecurityException e)
        {
            throw new TlsFatalAlert(AlertDescription.internal_error, e);
        }
    }

    public TlsStreamSigner getStreamSigner(SignatureAndHashAlgorithm algorithm)
        throws IOException
    {
        return null;
    }
}