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## org.bouncycastle.crypto
Interface DerivationFunction

All Known Implementing Classes:
  KDF2BytesGenerator, MGF1BytesGenerator

public interface DerivationFunction

base interface for general purpose byte derivation functions.

Method Summary
`int` | `generateBytes(byte[] out, int outOff, int len)`
`Digest` | `getDigest()` return the message digest used as the basis for the function
`void` | `init(DerivationParameters param)`

Method Detail

### init

    public void init(DerivationParameters param)

### getDigest

    public Digest getDigest()

  return the message digest used as the basis for the function

### generateBytes

    public int generateBytes(byte[] out,
                             int outOff,
                             int len)
                      throws DataLengthException,
                             java.lang.IllegalArgumentException

  Throws:
    `DataLengthException`
    `java.lang.IllegalArgumentException`

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