org.bouncycastle.jsse.provider.ProvAlgorithmDecomposer 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.jsse.provider;

import java.util.Set;

import org.bouncycastle.tls.CipherSuite;

class ProvAlgorithmDecomposer
    extends JcaAlgorithmDecomposer
{
    static final ProvAlgorithmDecomposer INSTANCE_TLS = new ProvAlgorithmDecomposer(true);
    static final ProvAlgorithmDecomposer INSTANCE_X509 = new ProvAlgorithmDecomposer(false);

    private final boolean enableTLSAlgorithms;

    private ProvAlgorithmDecomposer(boolean enableTLSAlgorithms)
    {
        this.enableTLSAlgorithms = enableTLSAlgorithms;
    }

    public Set decompose(String algorithm)
    {
        if (algorithm.startsWith("TLS_"))
        {
            CipherSuiteInfo cipherSuiteInfo = ProvSSLContextSpi.getCipherSuiteInfo(algorithm);

            if (null != cipherSuiteInfo && !CipherSuite.isSCSV(cipherSuiteInfo.getCipherSuite()))
            {
                return enableTLSAlgorithms
                    ?   cipherSuiteInfo.getDecompositionTLS()
                    :   cipherSuiteInfo.getDecompositionX509();
            }
        }

        return super.decompose(algorithm);
    }
}