net.i2p.data

Class Signature

java.lang.Object

net.i2p.data.DataStructureImpl

net.i2p.data.SimpleDataStructure

net.i2p.data.Signature

All Implemented Interfaces:

Serializable, DataStructure

public class Signature
extends SimpleDataStructure

Defines the signature as defined by the I2P data structure spec. By default, a signature is a 40-byte array verifying the authenticity of some data using the DSA-SHA1 algorithm. The signature is the 20-byte R followed by the 20-byte S, both are unsigned integers. As of release 0.9.8, signatures of arbitrary length and type are supported. See SigType.

Author:

jrandom

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static byte[]	FAKE_SIGNATURE Deprecated. to be removed
static int	SIGNATURE_BYTES 40

Fields inherited from class net.i2p.data.SimpleDataStructure

_data

Constructor Summary

Constructors

Constructor and Description
Signature()
Signature(byte[] data)
Signature(SigType type) Unknown type not allowed as we won't know the length to read in the data.
Signature(SigType type, byte[] data) Should we allow an unknown type here?

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj) Warning - this returns true for two different classes with the same size and same data, e.g.
SigType	getType()
int	hashCode() We assume the data has enough randomness in it, so use the first 4 bytes for speed.
int	length() The legal length of the byte array in this data structure
String	toString()

Methods inherited from class net.i2p.data.SimpleDataStructure

calculateHash, fromBase64, fromByteArray, getData, readBytes, setData, toBase64, toByteArray, writeBytes

Methods inherited from class net.i2p.data.DataStructureImpl

read

Methods inherited from class java.lang.Object

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

Field Detail

SIGNATURE_BYTES

public static final int SIGNATURE_BYTES

40

FAKE_SIGNATURE

@Deprecated
public static final byte[] FAKE_SIGNATURE

Deprecated. to be removed

all zeros

Constructor Detail

Signature

public Signature()

Signature

public Signature(SigType type)

Unknown type not allowed as we won't know the length to read in the data.

Parameters:

type - non-null

Since:

0.9.8

Signature

public Signature(byte[] data)

Signature

public Signature(SigType type,
                 byte[] data)

Should we allow an unknown type here?

Parameters:

type - non-null

Since:

0.9.8

Method Detail

length

public int length()

Description copied from class: SimpleDataStructure

The legal length of the byte array in this data structure

Specified by:

length in class SimpleDataStructure

getType

public SigType getType()

Returns:

non-null

Since:

0.9.8

toString

public String toString()

Overrides:

toString in class SimpleDataStructure

Since:

0.9.8

hashCode

public int hashCode()

Description copied from class: SimpleDataStructure

We assume the data has enough randomness in it, so use the first 4 bytes for speed. If this is not the case, override in the extending class.

Overrides:

hashCode in class SimpleDataStructure

Since:

0.9.17

equals

public boolean equals(Object obj)

Description copied from class: SimpleDataStructure

Warning - this returns true for two different classes with the same size and same data, e.g. SessionKey and SessionTag, but you wouldn't put them in the same Set, would you?

Overrides:

equals in class SimpleDataStructure

Since:

0.9.17