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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.openpgp.operator;

import org.spongycastle.bcpg.S2K;
import org.spongycastle.openpgp.PGPException;

public abstract class PBESecretKeyDecryptor
{
    private char[] passPhrase;
    private PGPDigestCalculatorProvider calculatorProvider;

    protected PBESecretKeyDecryptor(char[] passPhrase, PGPDigestCalculatorProvider calculatorProvider)
    {
        this.passPhrase = passPhrase;
        this.calculatorProvider = calculatorProvider;
    }

    public PGPDigestCalculator getChecksumCalculator(int hashAlgorithm)
        throws PGPException
    {
        return calculatorProvider.get(hashAlgorithm);
    }

    public byte[] makeKeyFromPassPhrase(int keyAlgorithm, S2K s2k)
        throws PGPException
    {
        return PGPUtil.makeKeyFromPassPhrase(calculatorProvider, keyAlgorithm, s2k, passPhrase);
    }

    public abstract byte[] recoverKeyData(int encAlgorithm, byte[] key, byte[] iv, byte[] keyData, int keyOff, int keyLen)
        throws PGPException;
}