net.brabenetz.lib.securedproperties.core

Class Encryption

java.lang.Object

net.brabenetz.lib.securedproperties.core.Encryption

public final class Encryption
extends Object

Some Utilities about encryptions.

Method Summary

Modifier and Type	Method and Description
static SecretKey	createKey(Algorithm algorithm) generate a SecretKey with the given Algorithm and wraps checked Exceptions into RuntimeExceptions.
static String	decrypt(Algorithm algorithm, SecretKey secretKey, int saltLength, String encryptedValue) Decrypt the given encrypted value with the given SecretKey and the given Algorithm.
static String	encrypt(Algorithm algorithm, SecretKey secretKey, int saltLength, String plainTextValue) Encrypt the given plain-text value with the given SecretKey and the given Algorithm.
static Algorithm	getFirstSupportedAlgorithm(Algorithm... algorithms)
static boolean	isAlgorithmSupported(Algorithm algorithm) Checks if the given Algorithm can be used to encrypt String-Values.
static boolean	isEncryptedValue(String mybeEncryptedValue) Checks if the given String looks like an encrypted value.
static SecretKey	readSecretKey(Algorithm algorithm, String secretKeyBase64) Read a SecretKey from a base64 encoded String.
static String	toBase64String(SecretKey secretKey) transform a SecretKey to a Base64 encoded String.

Methods inherited from class java.lang.Object

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

Method Detail

isAlgorithmSupported

public static boolean isAlgorithmSupported(Algorithm algorithm)

Checks if the given Algorithm can be used to encrypt String-Values.

Parameters:

algorithm - The Algorithm to check.

Returns:

true if the Algorithm is supported.

getFirstSupportedAlgorithm

public static Algorithm getFirstSupportedAlgorithm(Algorithm... algorithms)
                                            throws IllegalArgumentException

Parameters:

algorithms - a list of Algorithm to check

Returns:

the first Algorithm which can be used for encryption, see isAlgorithmSupported(Algorithm).

Throws:

IllegalArgumentException - if no Algorithm is supported.

createKey

public static SecretKey createKey(Algorithm algorithm)

generate a SecretKey with the given Algorithm and wraps checked Exceptions into RuntimeExceptions.

Parameters:

algorithm - the Algorithm to use for generated the SecretKey

Returns:

the generated SecretKey.

readSecretKey

public static SecretKey readSecretKey(Algorithm algorithm,
                                      String secretKeyBase64)

Read a SecretKey from a base64 encoded String.

See Also:

toBase64String(SecretKey)

toBase64String

public static String toBase64String(SecretKey secretKey)

transform a SecretKey to a Base64 encoded String.

isEncryptedValue

public static boolean isEncryptedValue(String mybeEncryptedValue)

Checks if the given String looks like an encrypted value.

encrypt

public static String encrypt(Algorithm algorithm,
                             SecretKey secretKey,
                             int saltLength,
                             String plainTextValue)

Encrypt the given plain-text value with the given SecretKey and the given Algorithm.

Parameters:

algorithm - The Algorithm to use for the encryption.

secretKey - The SecretKey to use for the encryption.

plainTextValue - The value which should be encrypted.

Returns:

the encrypted value.

decrypt

public static String decrypt(Algorithm algorithm,
                             SecretKey secretKey,
                             int saltLength,
                             String encryptedValue)

Decrypt the given encrypted value with the given SecretKey and the given Algorithm.

Parameters:

algorithm - The Algorithm to use for the decryption.

secretKey - The SecretKey to use for the decryption.

encryptedValue - the encrypted value to decrypt.

Returns:

the decrypted value.