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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.bcpg;

import org.spongycastle.util.Encodable;

/**
 * base interface for a PGP key
 */
public interface BCPGKey
    extends Encodable
{
    /**
     * Return the base format for this key - in the case of the symmetric keys it will generally
     * be raw indicating that the key is just a straight byte representation, for an asymmetric
     * key the format will be PGP, indicating the key is a string of MPIs encoded in PGP format.
     * 
     * @return "RAW" or "PGP"
     */
    public String getFormat();
    
    /**
     * return a string of bytes giving the encoded format of the key, as described by it's format.
     * 
     * @return byte[]
     */
    public byte[] getEncoded();
    
}