SkippingCipher (Bouncy Castle Library 1.68 API Specification)

All Known Subinterfaces:

SkippingStreamCipher

All Known Implementing Classes:

ChaCha7539Engine, ChaChaEngine, Salsa20Engine, SICBlockCipher, XSalsa20Engine
```
public interface SkippingCipher
```
Ciphers producing a key stream which can be reset to particular points in the stream implement this.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`long`	`getPosition()`	Return the current "position" of the cipher
`long`	`seekTo(long position)`	Reset the cipher and then skip forward to a given position.
`long`	`skip(long numberOfBytes)`	Skip numberOfBytes forwards, or backwards.

- Method Detail
  - skip
```
long skip(long numberOfBytes)
```
    Skip numberOfBytes forwards, or backwards.
    
    Parameters:
    
    numberOfBytes - the number of bytes to skip (positive forward, negative backwards).
    
    Returns:
    
    the number of bytes actually skipped.
    
    Throws:
    
    java.lang.IllegalArgumentException - if numberOfBytes is an invalid value.
  - seekTo
```
long seekTo(long position)
```
    Reset the cipher and then skip forward to a given position.
    
    Parameters:
    
    position - the number of bytes in to set the cipher state to.
    
    Returns:
    
    the byte position moved to.
  - getPosition
```
long getPosition()
```
    Return the current "position" of the cipher
    
    Returns:
    
    the current byte position.