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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.util.encoders;

import java.io.IOException;
import java.io.OutputStream;

/**
 * Encode and decode byte arrays (typically from binary to 7-bit ASCII 
 * encodings).
 */
public interface Encoder
{
    int encode(byte[] data, int off, int length, OutputStream out) throws IOException;
    
    int decode(byte[] data, int off, int length, OutputStream out) throws IOException;

    int decode(String data, OutputStream out) throws IOException;
}