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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.bouncycastle.crypto.tls;

import org.bouncycastle.crypto.DSA;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.DSAPublicKeyParameters;
import org.bouncycastle.crypto.signers.DSASigner;

class TlsDSSSigner extends TlsDSASigner
{
    public boolean isValidPublicKey(AsymmetricKeyParameter publicKey)
    {
        return publicKey instanceof DSAPublicKeyParameters;
    }

    protected DSA createDSAImpl()
    {
        return new DSASigner();
    }
}