Module seppiko.commons.utils

Package org.seppiko.commons.utils.crypto

Class GeneratorUtil

java.lang.Object

org.seppiko.commons.utils.crypto.GeneratorUtil

public class GeneratorUtil
extends Object

Key and KeyPair Generator object util And SecureRandom object util

Author:

Leonard Woo

See Also:

• Java Security Standard Algorithm Names

Method Summary

Modifier and Type	Method	Description
static AlgorithmParameterGenerator	algorithmParameterGenerator(String algorithm)	Returns an AlgorithmParameterGenerator object for generating a set of parameters to be used with the specified algorithm.
static AlgorithmParameterGenerator	algorithmParameterGenerator(String algorithm, Provider provider)	Returns an AlgorithmParameterGenerator object for generating a set of parameters to be used with the specified algorithm.
static KeyGenerator	keyGenerator(String algorithm)	Returns a KeyGenerator object that generates secret keys for the specified algorithm.
static KeyGenerator	keyGenerator(String algorithm, Provider provider)	Returns a KeyGenerator object that generates secret keys for the specified algorithm.
static SecretKey	keyGenerator(String algorithm, Provider provider, int keySize)	Cryptographic key generator
static KeyPairGenerator	keyPairGenerator(String algorithm)	Returns a KeyPairGenerator object that generates public/private key pairs for the specified algorithm.
static KeyPairGenerator	keyPairGenerator(String algorithm, Provider provider)	Returns a KeyPairGenerator object that generates public/private key pairs for the specified * algorithm.
static KeyPair	keyPairGenerator(String algorithm, Provider provider, int keySize)	Asymmetric cryptographic key pair generator
static KeyPair	keyPairGenerator(String algorithm, Provider provider, AlgorithmParameterSpec params)	Asymmetric cryptographic key pair generator
static SecureRandom	secureRandom()	Returns a SecureRandom object that implements the specified Random Number Generator (RNG) algorithm.
static SecureRandom	secureRandom(String algorithm)	Returns a SecureRandom object that implements the specified Random Number Generator (RNG) algorithm.
static SecureRandom	secureRandom(String algorithm, Provider provider)	Returns a SecureRandom object that implements the specified Random Number Generator (RNG) algorithm.
static SecureRandom	secureRandom(String algorithm, Provider provider, SecureRandomParameters params)	Returns a SecureRandom object that implements the specified Random Number Generator (RNG) algorithm.
static byte[]	secureRandom(String algorithm, Provider provider, SecureRandomParameters params, int seedSize)	Get secure random bytes

Methods inherited from class java.lang.Object

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

Method Details

keyGenerator

public static KeyGenerator keyGenerator(String algorithm)
                                 throws NoSuchAlgorithmException,
NullPointerException

Returns a KeyGenerator object that generates secret keys for the specified algorithm.

Parameters:

algorithm - the standard name of the requested key algorithm

Returns:

new KeyGenerator object

Throws:

NoSuchAlgorithmException - if no Provider supports a KeyGeneratorSpi implementation for the specified algorithm

NullPointerException - if algorithm is null

keyGenerator

public static KeyGenerator keyGenerator(String algorithm,
 Provider provider)
                                 throws NoSuchAlgorithmException,
NullPointerException,
IllegalArgumentException

Returns a KeyGenerator object that generates secret keys for the specified algorithm.

Parameters:

algorithm - the standard name of the requested key algorithm

provider - the provider

Returns:

new KeyGenerator object

Throws:

NoSuchAlgorithmException - if a KeyGeneratorSpi implementation for the specified algorithm is not available from the specified Provider object

NullPointerException - if algorithm is null

IllegalArgumentException - if the provider is null

keyPairGenerator

public static KeyPairGenerator keyPairGenerator(String algorithm)
                                         throws NoSuchAlgorithmException,
NullPointerException

Returns a KeyPairGenerator object that generates public/private key pairs for the specified algorithm.

Parameters:

algorithm - the standard string name of the algorithm

Returns:

the new KeyPairGenerator object

Throws:

NoSuchAlgorithmException - if no Provider supports a KeyPairGeneratorSpi implementation for the specified algorithm

NullPointerException - if algorithm is null

keyPairGenerator

public static KeyPairGenerator keyPairGenerator(String algorithm,
 Provider provider)
                                         throws NoSuchAlgorithmException,
IllegalArgumentException,
NullPointerException

Returns a KeyPairGenerator object that generates public/private key pairs for the specified * algorithm.

Parameters:

algorithm - the standard string name of the algorithm

provider - the provider

Returns:

the new KeyPairGenerator object

Throws:

NoSuchAlgorithmException - if no Provider supports a KeyPairGeneratorSpi implementation for the specified algorithm

IllegalArgumentException - if the specified provider is null

NullPointerException - if algorithm is null

algorithmParameterGenerator

public static AlgorithmParameterGenerator algorithmParameterGenerator(String algorithm)
                                                               throws NoSuchAlgorithmException,
NullPointerException

Returns an AlgorithmParameterGenerator object for generating a set of parameters to be used with the specified algorithm.

Parameters:

algorithm - the name of the algorithm this parameter generator is associated with

Returns:

the new AlgorithmParameterGenerator object

Throws:

NoSuchAlgorithmException - if an AlgorithmParameterGeneratorSpi implementation for the specified algorithm is not available from the specified Provider object

NullPointerException - if algorithm is null

algorithmParameterGenerator

public static AlgorithmParameterGenerator algorithmParameterGenerator(String algorithm,
 Provider provider)
                                                               throws NoSuchAlgorithmException,
IllegalArgumentException,
NullPointerException

Returns an AlgorithmParameterGenerator object for generating a set of parameters to be used with the specified algorithm.

Parameters:

algorithm - the name of the algorithm this parameter generator is associated with

provider - the Provider

Returns:

the new AlgorithmParameterGenerator object

Throws:

NoSuchAlgorithmException - if an AlgorithmParameterGeneratorSpi implementation for the specified algorithm is not available from the specified Provider object

IllegalArgumentException - if the specified provider is null

NullPointerException - if algorithm is null

keyGenerator

public static SecretKey keyGenerator(String algorithm,
 Provider provider,
 int keySize)
                              throws NoSuchAlgorithmException,
NullPointerException,
IllegalArgumentException

Cryptographic key generator

Parameters:

algorithm - the standard name of the requested key algorithm

provider - the provider, if use default provider is null

keySize - key size

Returns:

secret key byte array

Throws:

NoSuchAlgorithmException - if a KeyGeneratorSpi implementation for the specified algorithm is not available from the specified Provider object

NullPointerException - if algorithm is null

IllegalArgumentException - if the provider is null

keyPairGenerator

public static KeyPair keyPairGenerator(String algorithm,
 Provider provider,
 int keySize)
                                throws NoSuchAlgorithmException,
IllegalArgumentException,
NullPointerException

Asymmetric cryptographic key pair generator

Parameters:

algorithm - the standard string name of the algorithm.

provider - the provider, if use default provider is null.

keySize - key size.

Returns:

key pair object.

Throws:

NoSuchAlgorithmException - if no Provider supports a KeyPairGeneratorSpi implementation for the specified algorithm.

IllegalArgumentException - if the provider is null.

NullPointerException - if algorithm is null.

See Also:

• KeyPairGenerator

keyPairGenerator

public static KeyPair keyPairGenerator(String algorithm,
 Provider provider,
 AlgorithmParameterSpec params)
                                throws NoSuchAlgorithmException,
IllegalArgumentException,
NullPointerException,
InvalidAlgorithmParameterException

Asymmetric cryptographic key pair generator

Parameters:

algorithm - the standard string name of the algorithm.

provider - the provider, if use default provider is null.

params - the parameter set used to generate the keys.

Returns:

key pair object.

Throws:

NoSuchAlgorithmException - if no Provider supports a KeyPairGeneratorSpi implementation for the specified algorithm.

IllegalArgumentException - if the provider is null.

NullPointerException - if algorithm is null.

InvalidAlgorithmParameterException - if the given parameters are inappropriate for this key pair generator.

See Also:

• KeyPairGenerator

secureRandom

public static SecureRandom secureRandom()

Returns a SecureRandom object that implements the specified Random Number Generator (RNG) algorithm.

Returns:

the new SecureRandom object.

secureRandom

public static SecureRandom secureRandom(String algorithm)

Returns a SecureRandom object that implements the specified Random Number Generator (RNG) algorithm.

Parameters:

algorithm - the name of the RNG algorithm.

Returns:

the new SecureRandom object.

secureRandom

public static SecureRandom secureRandom(String algorithm,
 Provider provider)

Returns a SecureRandom object that implements the specified Random Number Generator (RNG) algorithm.

Parameters:

algorithm - the name of the RNG algorithm.

provider - the provider.

Returns:

the new SecureRandom object.

secureRandom

public static SecureRandom secureRandom(String algorithm,
 Provider provider,
 SecureRandomParameters params)

Returns a SecureRandom object that implements the specified Random Number Generator (RNG) algorithm.

Parameters:

algorithm - the name of the RNG algorithm.

provider - the provider.

params - the SecureRandomParameters the newly created SecureRandom object must support.

Returns:

the new SecureRandom object.\

secureRandom

public static byte[] secureRandom(String algorithm,
 Provider provider,
 SecureRandomParameters params,
 int seedSize)

Get secure random bytes

Parameters:

algorithm - the name of the RNG algorithm.

provider - the provider.

params - the SecureRandomParameters the newly created SecureRandom object must support.

seedSize - the number of seed bytes to generate.

Returns:

the seed bytes.