com.goldencode.p2j.security

Class DigitalSignature

java.lang.Object

com.goldencode.p2j.security.DigitalSignature

public class DigitalSignature
extends java.lang.Object

A tool to sign messages and verify their signature for certain private : public key pair.

Field Summary

Fields

Modifier and Type	Field and Description
private static java.lang.String	ALGORITHM The algorithm used for signing the values, corresponds to the server certificate algo.
private java.security.PrivateKey	privateKey Private key
private java.security.PublicKey	publicKey Public key

Constructor Summary

Constructors

Constructor and Description
DigitalSignature(java.security.PrivateKey privateKey, java.security.PublicKey publicKey) Public constructor accepting private : public key pair.

Method Summary

Modifier and Type	Method and Description
static byte[]	fromHex(java.lang.String hexText) Converts a hex formatted string back to a byte array.
static DigitalSignature	fromServerKeyStore() Reads the server key store, retrieves the public and private key pair and returns an instance of DigitalSignature.
static void	main(java.lang.String[] args) Test for signing messages.
byte[]	sign(java.lang.String message) Signs the message with the private key and returns the signed value.
static java.lang.String	toHex(byte[] bytes) Converts a byte array into a hex format.
boolean	verify(java.lang.String originalMessage, byte[] signedMessage) Signs the message with the private key and returns the signed value.

Methods inherited from class java.lang.Object

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

Field Detail

ALGORITHM

private static final java.lang.String ALGORITHM

The algorithm used for signing the values, corresponds to the server certificate algo.

See Also:

Constant Field Values

privateKey

private final java.security.PrivateKey privateKey

Private key

publicKey

private final java.security.PublicKey publicKey

Public key

Constructor Detail

DigitalSignature

public DigitalSignature(java.security.PrivateKey privateKey,
                        java.security.PublicKey publicKey)

Public constructor accepting private : public key pair.

Parameters:

privateKey - Private key.

publicKey - Public key.

Method Detail

fromServerKeyStore

public static DigitalSignature fromServerKeyStore()
                                           throws java.security.KeyStoreException,
                                                  java.security.UnrecoverableKeyException,
                                                  java.security.NoSuchAlgorithmException,
                                                  java.io.IOException,
                                                  java.security.cert.CertificateException

Reads the server key store, retrieves the public and private key pair and returns an instance of DigitalSignature.

Returns:

An instance of DigitalSignature with the public and private key pair for the server.

Throws:

java.security.KeyStoreException

java.security.UnrecoverableKeyException

java.security.NoSuchAlgorithmException

java.io.IOException

java.security.cert.CertificateException

toHex

public static java.lang.String toHex(byte[] bytes)

Converts a byte array into a hex format.

Parameters:

bytes - The byte array to be converted.

Returns:

The converted string.

fromHex

public static byte[] fromHex(java.lang.String hexText)

Converts a hex formatted string back to a byte array.

Parameters:

hexText - Hex formatted string.

Returns:

Byte array.

sign

public byte[] sign(java.lang.String message)
            throws java.security.SignatureException,
                   java.security.InvalidKeyException,
                   java.security.NoSuchAlgorithmException

Signs the message with the private key and returns the signed value.

Parameters:

message - The message to sign.

Returns:

The signed message.

Throws:

java.security.SignatureException

java.security.InvalidKeyException

java.security.NoSuchAlgorithmException

verify

public boolean verify(java.lang.String originalMessage,
                      byte[] signedMessage)
               throws java.security.SignatureException,
                      java.security.InvalidKeyException,
                      java.security.NoSuchAlgorithmException

Signs the message with the private key and returns the signed value.

Parameters:

originalMessage - The original message.

signedMessage - The signed message.

Returns:

true if the signedMessage is generated by the key, false otherwise.

Throws:

java.security.SignatureException

java.security.InvalidKeyException

java.security.NoSuchAlgorithmException

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

Test for signing messages.

Parameters:

args - Unused.

Throws:

java.lang.Exception