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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.cms;

import org.spongycastle.asn1.x509.AlgorithmIdentifier;

public interface PasswordRecipient
    extends Recipient
{
    public static final int PKCS5_SCHEME2 = 0;
    public static final int PKCS5_SCHEME2_UTF8 = 1;

    byte[] calculateDerivedKey(int schemeID, AlgorithmIdentifier derivationAlgorithm, int keySize)
        throws CMSException;

    RecipientOperator getRecipientOperator(AlgorithmIdentifier keyEncryptionAlgorithm, AlgorithmIdentifier contentEncryptionAlgorithm, byte[] derivedKey, byte[] encryptedEncryptedContentKey)
        throws CMSException;

    int getPasswordConversionScheme();

    char[] getPassword();
}