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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 and up.

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package org.bouncycastle.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;
}