com.dpslink.base.util

Class StringEncrypter2

java.lang.Object

com.dpslink.base.util.StringEncrypter2

All Implemented Interfaces:

java.io.Serializable

public class StringEncrypter2
extends java.lang.Object
implements java.io.Serializable

A utility class that provides string encryption and decryption functions that are based on AES algorithms.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
private static java.util.Base64.Decoder	cvDecoder The base 64 decoder used for converting strings to byte arrays.
private static javax.crypto.Cipher	cvDecryptCipher The cipher for decryption.
private static java.util.Base64.Encoder	cvEncoder The base 64 encoder used for converting byte arrays to strings.
private static javax.crypto.Cipher	cvEncryptCipher The cipher for encryption.
private static javax.crypto.spec.SecretKeySpec	cvKeySpec The key used for encryption and decryption.
private static java.security.SecureRandom	RANDOM The random number generator used for initialization vectors.
private static long	serialVersionUID The class' serialization version id.

Constructor Summary

Constructors

Constructor and Description
StringEncrypter2()

Method Summary

Modifier and Type	Method and Description
static java.lang.String	decrypt(java.lang.String s, java.lang.String iv) Decrypts the given string.
static java.lang.String	encrypt(java.lang.String s, java.lang.String iv) Encrypts the given string.
static java.lang.String	getRandomIV() Returns a random generated initialization vector.
static boolean	isCryptoInstalled() Answers if the cryptography supporting classes are installed.

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

The class' serialization version id.

See Also:

Constant Field Values

RANDOM

private static final java.security.SecureRandom RANDOM

The random number generator used for initialization vectors.

cvEncoder

private static java.util.Base64.Encoder cvEncoder

The base 64 encoder used for converting byte arrays to strings.

cvDecoder

private static java.util.Base64.Decoder cvDecoder

The base 64 decoder used for converting strings to byte arrays.

cvKeySpec

private static javax.crypto.spec.SecretKeySpec cvKeySpec

The key used for encryption and decryption.

cvEncryptCipher

private static javax.crypto.Cipher cvEncryptCipher

The cipher for encryption.

cvDecryptCipher

private static javax.crypto.Cipher cvDecryptCipher

The cipher for decryption.

Constructor Detail

StringEncrypter2

public StringEncrypter2()

Method Detail

decrypt

public static java.lang.String decrypt(java.lang.String s,
                                       java.lang.String iv)

Decrypts the given string. The string must have been encrypted by the encrypt method of this class. Returns the same string if the cryptography classes are not installed.

Parameters:

s - (String) The string to be decrypted.

iv - (String) The initialization vector that was originally used to encrypt the string.

Returns:

String - The decrypted string.

encrypt

public static java.lang.String encrypt(java.lang.String s,
                                       java.lang.String iv)

Encrypts the given string. The string must be decrypted by the decrypt method of this class. Returns the same string if the cryptography classes are not installed.

Parameters:

s - (String) The string to be encrypted.

iv - (String) The initialization vector to use for encryption.

Returns:

String - The encrypted string.

getRandomIV

public static java.lang.String getRandomIV()

Returns a random generated initialization vector.

Returns:

String - The initialization vector.

isCryptoInstalled

public static boolean isCryptoInstalled()

Answers if the cryptography supporting classes are installed.

Returns:

boolean - true if the cryptography classes are installed, otherwise false.