org.cryptimeleon.math.misc

Class ByteArrayImpl

java.lang.Object

org.cryptimeleon.math.misc.ByteArrayImpl

All Implemented Interfaces:

UniqueByteRepresentable, PrfImage, PrfKey, PrfPreimage, Representable

public class ByteArrayImpl
extends java.lang.Object
implements PrfKey, PrfPreimage, PrfImage

Field Summary

Fields

Modifier and Type	Field and Description
protected byte[]	data

Constructor Summary

Constructors

Constructor and Description
ByteArrayImpl(byte[] bytes)
ByteArrayImpl(Representation repr)

Method Summary

Modifier and Type	Method and Description
ByteArrayImpl	append(ByteArrayImpl a) Create new byte array as concatenation of this with a.
boolean	equals(java.lang.Object obj)
static ByteArrayImpl	fromRandom(int numberBytes) Creates a new ByteArrayImpl instance filled with numberBytes bytes of randomness
byte[]	getData()
Representation	getRepresentation() The representation of this object.
int	hashCode()
int	length() Returns the length of this byte array.
ByteArrayImpl	substring(int firstIndex, int length) Returns an array containing the designated part of this byte array, meaning that returned[i] = this[firstIndex+i].
java.lang.String	toString()
ByteAccumulator	updateAccumulator(ByteAccumulator accumulator) Updates the ByteAccumulator with the unique byte representation of this object.
ByteArrayImpl	xor(ByteArrayImpl a) Compute exclusive or of two byte arrays.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.cryptimeleon.math.hash.UniqueByteRepresentable

getUniqueByteRepresentation

Field Detail

data

protected byte[] data

Constructor Detail

ByteArrayImpl

public ByteArrayImpl(byte[] bytes)

ByteArrayImpl

public ByteArrayImpl(Representation repr)

Method Detail

fromRandom

public static ByteArrayImpl fromRandom(int numberBytes)

Creates a new ByteArrayImpl instance filled with numberBytes bytes of randomness

Parameters:

numberBytes - number of random bytes / length of resulting ByteArrayImplementation

getData

public byte[] getData()

append

public ByteArrayImpl append(ByteArrayImpl a)

Create new byte array as concatenation of this with a.

Parameters:

a - the array to append

Returns:

the result of concatenation

substring

public ByteArrayImpl substring(int firstIndex,
                               int length)

Returns an array containing the designated part of this byte array, meaning that returned[i] = this[firstIndex+i].

Parameters:

firstIndex - first (byte) index that will be copied to the result

length - the number of bytes to be copied

Returns:

a ByteArrayImpl of length length that is a substring of this original.

length

public int length()

Returns the length of this byte array.

Returns:

the length of this byte array

xor

public ByteArrayImpl xor(ByteArrayImpl a)

Compute exclusive or of two byte arrays.

Returns a new byte array where the i-th entry is the exclusive or of this byte array's i-th entry and a's i-th entry.

Parameters:

a - the argument to XOR this with

Returns:

the result of XORing

getRepresentation

public Representation getRepresentation()

Description copied from interface: Representable

The representation of this object. Used for serialization. A convenient way to implement this is using @link ReprUtil

Specified by:

getRepresentation in interface Representable

Returns:

a Representation or null if an equal object can be recreated without any information.

See Also:

Representation

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

updateAccumulator

public ByteAccumulator updateAccumulator(ByteAccumulator accumulator)

Description copied from interface: UniqueByteRepresentable

Updates the ByteAccumulator with the unique byte representation of this object.

The input to the accumulators update function is an injective (with respect to a given domain) byte encoding of this object.

For many use-cases, the AnnotatedUbrUtil can be used to quickly implement this method.

Specified by:

updateAccumulator in interface UniqueByteRepresentable

Returns:

the same accumulator as was input