Module seppiko.commons.utils

Package org.seppiko.commons.utils.crypto

Class KeyUtil

java.lang.Object

org.seppiko.commons.utils.crypto.KeyUtil

public class KeyUtil
extends Object

Key generator utility

Author:

Leonard Woo

See Also:

• Security Standard Algorithm Names

Method Summary

Modifier and Type	Method	Description
static RSAPublicKey	getRSAPublicKey(RSAPrivateKey rsaPrivateKey)	Generate RSA public key using RSA private key
static KeyAgreement	keyAgreement(String algorithm, Provider provider)	Returns a KeyAgreement instance
static byte[]	keyAgreement(String algorithm, Provider provider, Key privateKey, Key publicKey)	Returns a KeyAgreement object that implements the specified key agreement algorithm.
static KeyFactory	keyFactory(String algorithm, Provider provider)	Returns a KeyFactory object that converts public/private keys of the specified algorithm.
static KeyStore	keyStore(KeyStoreAlgorithms type, InputStream is, char[] password)	KeyStore util
static KeyStore	keyStore(KeyStoreAlgorithms type, KeyStore.LoadStoreParameter loadStore)	KeyStore util
static SecretKeyFactory	secretKeyFactory(String algorithm, Provider provider)	Returns a SecretKeyFactory object that converts secret keys of the specified algorithm.
static byte[]	secretKeyFactory(String algorithm, Provider provider, KeySpec keySpec)	Returns a SecretKeyFactory object that converts secret keys of the specified algorithm.

Methods inherited from class java.lang.Object

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

Method Details

secretKeyFactory

public static byte[] secretKeyFactory(String algorithm,
 Provider provider,
 KeySpec keySpec)
                               throws NoSuchAlgorithmException,
InvalidKeySpecException,
NullPointerException

Returns a SecretKeyFactory object that converts secret keys of the specified algorithm.

Parameters:

algorithm - Secret Key Factory algorithm.

provider - an instance of the provider.

keySpec - KeySpec impl e.g. PBEKeySpec.

Returns:

Secret Key Factory instance.

Throws:

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

InvalidKeySpecException - if the given key specification is inappropriate for this secret-key factory to produce a secret key.

NullPointerException - if algorithm is null.

See Also:

• SecretKeyFactory

secretKeyFactory

public static SecretKeyFactory secretKeyFactory(String algorithm,
 Provider provider)
                                         throws NoSuchAlgorithmException,
NullPointerException

Returns a SecretKeyFactory object that converts secret keys of the specified algorithm.

Parameters:

algorithm - Secret Key Factory algorithm.

provider - an instance of the provider.

Returns:

Secret Key Factory instance.

Throws:

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

NullPointerException - if algorithm is null.

See Also:

• SecretKeyFactory

keyFactory

public static KeyFactory keyFactory(String algorithm,
 Provider provider)
                             throws NullPointerException,
NoSuchAlgorithmException

Returns a KeyFactory object that converts public/private keys of the specified algorithm.

Parameters:

algorithm - key algorithm.

provider - an instance of the provider.

Returns:

KeyFactory instance.

Throws:

NullPointerException - if algorithm is null.

NoSuchAlgorithmException - if a KeyFactorySpi implementation for the specified algorithm is not available from the specified provider.

See Also:

• KeyFactory

keyAgreement

public static KeyAgreement keyAgreement(String algorithm,
 Provider provider)
                                 throws NullPointerException,
NoSuchAlgorithmException

Returns a KeyAgreement instance

Parameters:

algorithm - the standard name of the requested key agreement algorithm.

provider - the provider.

Returns:

KeyAgreement instance.

Throws:

NullPointerException - if algorithm is null.

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

keyAgreement

public static byte[] keyAgreement(String algorithm,
 Provider provider,
 Key privateKey,
 Key publicKey)
                           throws NoSuchAlgorithmException,
NullPointerException,
InvalidKeyException

Returns a KeyAgreement object that implements the specified key agreement algorithm.

Parameters:

algorithm - the standard name of the requested key agreement algorithm.

provider - the provider.

privateKey - the party's private information.

publicKey - the key for this phase.

Returns:

the new buffer with the shared secret.

Throws:

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

NullPointerException - if algorithm is null.

InvalidKeyException - if the given key is inappropriate for this key agreement or phase.

See Also:

• KeyAgreement

keyStore

public static KeyStore keyStore(KeyStoreAlgorithms type,
 InputStream is,
 char[] password)
                         throws KeyStoreException,
CertificateException,
IOException,
NoSuchAlgorithmException

KeyStore util

Parameters:

type - KeyStore type.

is - the input stream from which the keystore is loaded, or null.

password - the password used to check the integrity of the keystore, the password used to unlock the keystore, or null.

Returns:

KeyStore instance.

Throws:

KeyStoreException - if no Provider supports a KeyStoreSpi implementation for the specified type.

CertificateException - if any of the certificates in the keystore could not be loaded.

IOException - if there is an I/O or format problem with the keystore data, if a password is required but not given, or if the given password was incorrect.

NoSuchAlgorithmException - if the algorithm used to check the integrity of the keystore cannot be found.

See Also:

• KeyStore

keyStore

public static KeyStore keyStore(KeyStoreAlgorithms type,
 KeyStore.LoadStoreParameter loadStore)
                         throws KeyStoreException,
CertificateException,
IOException,
NoSuchAlgorithmException

KeyStore util

Parameters:

type - KeyStore type.

loadStore - the KeyStore.LoadStoreParameter that specifies how to load the keystore, which may be null

Returns:

KeyStore instance.

Throws:

KeyStoreException - if no Provider supports a KeyStoreSpi implementation for the specified type.

CertificateException - if any of the certificates in the keystore could not be loaded.

IOException - if there is an I/O or format problem with the keystore data, if a password is required but not given, or if the given password was incorrect.

NoSuchAlgorithmException - if the algorithm used to check the integrity of the keystore cannot be found.

See Also:

• KeyStore

getRSAPublicKey

public static RSAPublicKey getRSAPublicKey(RSAPrivateKey rsaPrivateKey)
                                    throws NullPointerException,
IllegalArgumentException

Generate RSA public key using RSA private key

Parameters:

rsaPrivateKey - RSA private key

Returns:

RSA public key,

Throws:

NullPointerException - if RSA private key is null.

IllegalArgumentException - if something is wrong.