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## org.bouncycastle.crypto.paddings
Interface BlockCipherPadding

All Known Implementing Classes:
  TBCPadding, ISO10126d2Padding, X923Padding, ZeroBytePadding, PKCS7Padding, ISO7816d4Padding

public interface BlockCipherPadding

Block cipher padders are expected to conform to this interface

Method Summary
`int` | `addPadding(byte[] in, int inOff)` add the pad bytes to the passed in block, returning the number of bytes added.
`java.lang.String` | `getPaddingName()` Return the name of the algorithm the cipher implements.
`void` | `init(java.security.SecureRandom random)` Initialise the padder.
`int` | `padCount(byte[] in)` return the number of pad bytes present in the block.

Method Detail

### init

    public void init(java.security.SecureRandom random)
              throws java.lang.IllegalArgumentException

  Initialise the padder.
  Parameters:
    `random` - the source of randomness for the padding, if required.

### getPaddingName

    public java.lang.String getPaddingName()

  Return the name of the algorithm the cipher implements.
  Returns:
    the name of the algorithm the cipher implements.

### addPadding

    public int addPadding(byte[] in,
                          int inOff)

  add the pad bytes to the passed in block, returning the number of bytes added.

  Note: this assumes that the last block of plain text is always passed to it inside in. i.e. if inOff is zero, indicating the entire block is to be overwritten with padding the value of in should be the same as the last block of plain text. The reason for this is that some modes such as "trailing bit compliment" base the padding on the last byte of plain text.

### padCount

    public int padCount(byte[] in)
                 throws InvalidCipherTextException

  return the number of pad bytes present in the block.
  Throws:
    `InvalidCipherTextException` - if the padding is badly formed or invalid.

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