org.cryptimeleon.math.hash

Class EscapingByteAccumulator

java.lang.Object

org.cryptimeleon.math.hash.ByteAccumulator

org.cryptimeleon.math.hash.EscapingByteAccumulator

All Implemented Interfaces:

java.lang.Comparable<ByteAccumulator>

public class EscapingByteAccumulator
extends ByteAccumulator

An EscapingByteAccumulator A wraps some ByteAccumulator B where a single escaped symbol is replaced by two of those symbols when writing to the accumulator.

This allows recursive calls for lists, i.e. one would use the following template:

 for (Object i : list) {
     i.appendAccumulator(new EscapingByteAccumulator(acc));
     acc.appendSeparator();
 }
 

This ensures that the only unescaped separator bytes in acc are the ones separating list items (all other separator bytes written by the items i are escaped).

Field Summary

Fields

Modifier and Type	Field and Description
protected ByteAccumulator	acc
protected byte	escapedSymbol

Fields inherited from class org.cryptimeleon.math.hash.ByteAccumulator

SEPARATOR

Constructor Summary

Constructors

Constructor and Description
EscapingByteAccumulator(ByteAccumulator acc) Sets up an escaping byte accumulator that escapes the separator symbol
EscapingByteAccumulator(ByteAccumulator acc, byte escapedSymbol) Sets up an escaping byte accumulator that escapes the given symbol

Method Summary

Modifier and Type	Method and Description
void	append(byte[] bytes) Appends bytes to the input x of this accumulator.
byte[]	extractBytes() Extracts f(x) from the accumulator, where x was input by append() calls.

Methods inherited from class org.cryptimeleon.math.hash.ByteAccumulator

append, append, append, append, appendAndSeparate, appendAndSeparate, appendPadded, appendSeperator, compareTo, escapeAndAppend, escapeAndAppend, escapeAndAppend, escapeAndSeparate, escapeAndSeparate, escapeAndSeparate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

acc

protected ByteAccumulator acc

escapedSymbol

protected byte escapedSymbol

Constructor Detail

EscapingByteAccumulator

public EscapingByteAccumulator(ByteAccumulator acc)

Sets up an escaping byte accumulator that escapes the separator symbol

EscapingByteAccumulator

public EscapingByteAccumulator(ByteAccumulator acc,
                               byte escapedSymbol)

Sets up an escaping byte accumulator that escapes the given symbol

Method Detail

append

public void append(byte[] bytes)

Description copied from class: ByteAccumulator

Appends bytes to the input x of this accumulator.

Specified by:

append in class ByteAccumulator

extractBytes

public byte[] extractBytes()

Description copied from class: ByteAccumulator

Extracts f(x) from the accumulator, where x was input by append() calls.

Specified by:

extractBytes in class ByteAccumulator

Returns:

f(x)