com.arxanfintech.common.crypto

Class PublicKey

java.lang.Object

com.arxanfintech.common.crypto.PublicKey

All Implemented Interfaces:

Key

public class PublicKey
extends Object
implements Key

An EC public Key suitable for verifying a signature created with the corresponding EC PrivateKey

See Also:

PrivateKey

Constructor Summary

Constructors

Constructor and Description
PublicKey(byte[] pub, Cryptography crypto) Create from uncompressed binary representation

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
static PublicKey	fromCompressed(byte[] pub, Cryptography crypto)
int	hashCode()
PublicKey	offsetKey(BigInteger offset) Return a key computable for this key with an offset.
byte[]	toByteArray() Safe access to the key's internal representation
String	toString()
boolean	verify(byte[] hash, byte[] signature) verify a signature created with the private counterpart of this key

Methods inherited from class java.lang.Object

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

Constructor Detail

PublicKey

public PublicKey(byte[] pub,
                 Cryptography crypto)

Create from uncompressed binary representation

Parameters:

pub - pub

crypto - crypto

Method Detail

fromCompressed

public static PublicKey fromCompressed(byte[] pub,
                                       Cryptography crypto)

toByteArray

public byte[] toByteArray()

Description copied from interface: Key

Safe access to the key's internal representation

Specified by:

toByteArray in interface Key

Returns:

a copy of the key's internal representation

verify

public boolean verify(byte[] hash,
                      byte[] signature)

verify a signature created with the private counterpart of this key

Parameters:

hash - arbitrary data

signature - signature

Returns:

true if valid

offsetKey

public PublicKey offsetKey(BigInteger offset)

Description copied from interface: Key

Return a key computable for this key with an offset. Due to a homomorphic property of EC one may compute the offset key of both private and public keys independently such that they build a valid new pair.

Specified by:

offsetKey in interface Key

Parameters:

offset - offset

Returns:

a key derived of this with an offset.

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object