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Lightweight crypto toolkit for Android and Java 6+
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package bouncycastle.crypto;
/**
* base interface for general purpose byte derivation functions.
*/
public interface DerivationFunction
{
public void init(DerivationParameters param);
/**
* return the message digest used as the basis for the function
*/
public Digest getDigest();
public int generateBytes(byte[] out, int outOff, int len)
throws DataLengthException, IllegalArgumentException;
}