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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.crypto.tls;

import java.io.IOException;

import org.spongycastle.crypto.params.AsymmetricKeyParameter;
import org.spongycastle.crypto.params.RSAKeyParameters;

public class DefaultTlsEncryptionCredentials extends AbstractTlsEncryptionCredentials
{
    protected TlsContext context;
    protected Certificate certificate;
    protected AsymmetricKeyParameter privateKey;

    public DefaultTlsEncryptionCredentials(TlsContext context, Certificate certificate,
        AsymmetricKeyParameter privateKey)
    {
        if (certificate == null)
        {
            throw new IllegalArgumentException("'certificate' cannot be null");
        }
        if (certificate.isEmpty())
        {
            throw new IllegalArgumentException("'certificate' cannot be empty");
        }
        if (privateKey == null)
        {
            throw new IllegalArgumentException("'privateKey' cannot be null");
        }
        if (!privateKey.isPrivate())
        {
            throw new IllegalArgumentException("'privateKey' must be private");
        }

        if (privateKey instanceof RSAKeyParameters)
        {
        }
        else
        {
            throw new IllegalArgumentException("'privateKey' type not supported: "
                + privateKey.getClass().getName());
        }

        this.context = context;
        this.certificate = certificate;
        this.privateKey = privateKey;
    }

    public Certificate getCertificate()
    {
        return certificate;
    }

    public byte[] decryptPreMasterSecret(byte[] encryptedPreMasterSecret)
        throws IOException
    {
        return TlsRSAUtils.safeDecryptPreMasterSecret(context, (RSAKeyParameters)privateKey, encryptedPreMasterSecret);
    }
}