License4J

java.lang.Object
|
+--com.smardec.license4j.LicenseUtil

public final class LicenseUtil

extends java.lang.Object

Provides utility methods for generating key pair and for signing arbitrary user content.

Method Summary
static java.lang.String[]	createKeyPair() Creates key pair and and returns it as an array of strings.
static void	createKeyPair(java.lang.String filename) Creates key pair and saves it to the specified file.
static void	createKeyPair(java.io.Writer writer) Creates key pair and saves it to the specified Writer.
static java.lang.String	getMacAddress() The method returns host MAC address.
static java.util.Vector	getMacAddresses() The method returns all MAC addresses of the host.
static java.lang.String	sign(byte[] message, java.lang.String privateKey) The method allows to sign arbitrary content using private key.
static java.lang.String	sign(java.lang.String message, java.lang.String privateKey) The method allows to sign arbitrary content using private key.
static boolean	verify(byte[] message, java.lang.String signature, java.lang.String publicKey) The method allows to verify the signature of the specified data using public key.
static boolean	verify(java.lang.String message, java.lang.String signature, java.lang.String publicKey) The method allows to verify the signature of the specified data using public key.

Methods inherited from class java.lang.Object

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

Method Detail

createKeyPair
public static void createKeyPair(java.lang.String filename)

Creates key pair and saves it to the specified file.

Parameters:

filename - name of the file

Creates key pair and saves it to the specified Writer. Note that Writer.close() method is not invoked after writing the keys.

Parameters:

writer - Writer that will contain public and private keys

Creates key pair and and returns it as an array of strings. The first element in the array is public key and the second element is private key.

Returns:

array that contains public and private keys respectively.

The method allows to sign arbitrary content using private key. Validity can be verified using verify(String, String, String).

Parameters:

message - data to sign

privateKey - private key

Returns:

signature of the specified data.

Throws:

java.security.GeneralSecurityException - if errors occured during signing

The method allows to sign arbitrary content using private key. Validity can be verified using verify(String, String, String).

Parameters:

message - data to sign

privateKey - private key

Returns:

signature of the specified data.

Throws:

java.security.GeneralSecurityException - if errors occured during signing

The method allows to verify the signature of the specified data using public key. The data can be signed using sign(String, String).

Parameters:

message - signed data

signature - data's signature

publicKey - public key

Returns:

true if the signature was verified, false otherwise.

Throws:

java.security.GeneralSecurityException - if errors occured during verification process

The method allows to verify the signature of the specified data using public key. The data can be signed using sign(String, String).

Parameters:

message - signed data

signature - data's signature

publicKey - public key

Returns:

true if the signature was verified, false otherwise.

Throws:

java.security.GeneralSecurityException - if errors occured during verification process

The method returns host MAC address.

Returns:

MAC address string or null if error occured.

The method returns all MAC addresses of the host.

Returns:

Vector of Strings.