org.bouncycastle.tls.crypto.impl.jcajce.JcaTlsECDSA13Verifier 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.PublicKey;
import java.security.Signature;

import org.bouncycastle.tls.DigitallySigned;
import org.bouncycastle.tls.SignatureAndHashAlgorithm;
import org.bouncycastle.tls.SignatureScheme;
import org.bouncycastle.tls.crypto.TlsStreamVerifier;
import org.bouncycastle.tls.crypto.TlsVerifier;

/**
 * Implementation class for verification of ECDSA signatures in TLS 1.3+ using the JCA.
 */
public class JcaTlsECDSA13Verifier
    implements TlsVerifier
{
    private final JcaTlsCrypto crypto;
    private final PublicKey publicKey;
    private final int signatureScheme;

    public JcaTlsECDSA13Verifier(JcaTlsCrypto crypto, PublicKey publicKey, int signatureScheme)
    {
        if (null == crypto)
        {
            throw new NullPointerException("crypto");
        }
        if (null == publicKey)
        {
            throw new NullPointerException("publicKey");
        }
        if (!SignatureScheme.isECDSA(signatureScheme))
        {
            throw new IllegalArgumentException("signatureScheme");
        }

        this.crypto = crypto;
        this.publicKey = publicKey;
        this.signatureScheme = signatureScheme;
    }

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

    public boolean verifyRawSignature(DigitallySigned signature, byte[] hash)
    {
        SignatureAndHashAlgorithm algorithm = signature.getAlgorithm();
        if (algorithm == null || SignatureScheme.from(algorithm) != signatureScheme)
        {
            throw new IllegalStateException("Invalid algorithm: " + algorithm);
        }

        try
        {
            Signature signer = crypto.getHelper().createSignature("NoneWithECDSA");
            signer.initVerify(publicKey);
            signer.update(hash, 0, hash.length);
            return signer.verify(signature.getSignature());
        }
        catch (GeneralSecurityException e)
        {
            throw Exceptions.illegalStateException("unable to process signature: " + e.getMessage(), e);
        }
    }
}