org.bouncycastle.tls.DefaultTlsECConfigVerifier 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;

import java.util.Vector;

import org.bouncycastle.tls.crypto.TlsECConfig;

public class DefaultTlsECConfigVerifier
    implements TlsECConfigVerifier
{
    protected int minimumCurveBits;
    protected Vector namedGroups; 

    public DefaultTlsECConfigVerifier(int minimumCurveBits, Vector namedGroups)
    {
        this.minimumCurveBits = Math.max(1, minimumCurveBits);
        this.namedGroups = namedGroups;
    }

    public boolean accept(TlsECConfig ecConfig)
    {
        // NOTE: Any value of ecConfig.pointCompression is acceptable

        int namedGroup = ecConfig.getNamedGroup();
        if (namedGroup < 0)
        {
            return false;
        }

        if (NamedGroup.getCurveBits(namedGroup) < minimumCurveBits)
        {
            return false;
        }

        if (namedGroups != null && !namedGroups.contains(namedGroup))
        {
            /*
             * RFC 4492 4. [...] servers MUST NOT negotiate the use of an ECC cipher suite unless
             * they can complete the handshake while respecting the choice of curves and compression
             * techniques specified by the client.
             */
            return false;
        }

        return true;
    }
}