com.dpslink.base.as400

Class AS400StringEncrypter

java.lang.Object

com.dpslink.base.as400.AS400StringEncrypter

All Implemented Interfaces:

java.io.Serializable

public class AS400StringEncrypter
extends java.lang.Object
implements java.io.Serializable

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

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
private static javax.crypto.Cipher	cvDecryptCipher The cipher for decryption.
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 long	serialVersionUID The class' serialization version id.

Constructor Summary

Constructors

Constructor and Description
AS400StringEncrypter()

Method Summary

Modifier and Type	Method and Description
static byte[]	ascii2ebcdic(java.lang.String s) Converts an ASCII string to an EBCDIC byte array.
static java.lang.String	decrypt(byte[] b, java.lang.String iv) Decrypts the given EBCDIC encoded byte array into an ASCII string.
static java.lang.String	ebcdic2ascii(byte[] b) Converts an EBCDIC byte array to an ASCII string.
static byte[]	encrypt(java.lang.String s, java.lang.String iv) Encrypts the given ASCII string into an EBCDIC encoded byte array.
static byte[]	encrypt(java.lang.String s, java.lang.String iv, int len) Encrypts the given ASCII string into an EBCDIC encoded byte array.
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

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

AS400StringEncrypter

public AS400StringEncrypter()

Method Detail

decrypt

public static java.lang.String decrypt(byte[] b,
                                       java.lang.String iv)

Decrypts the given EBCDIC encoded byte array into an ASCII string. The byte array must have been encrypted by the encrypt method of this class or by the backend ERP system. Returns an empty string if cryptography classes are not installed.

Parameters:

b - (byte[]) The byte array to be decrypted.

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

Returns:

String - The decrypted string.

encrypt

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

Encrypts the given ASCII string into an EBCDIC encoded byte array. The string must be decrypted by the decrypt method of this class or by the back end ERP system. Returns an empty byte array 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:

byte[] - The encrypted string.

encrypt

public static byte[] encrypt(java.lang.String s,
                             java.lang.String iv,
                             int len)

Encrypts the given ASCII string into an EBCDIC encoded byte array. The string must be decrypted by the decrypt method of this class or by the back end ERP system. Returns an empty byte array if the cryptography classes are not installed.

Parameters:

s - (String) The string to be encrypted.

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

len - (int) The forced length for string to be encrypted. If necessary, pads or truncates the given string to achieve this length prior to performing encryption. Padding and truncation is to the right. A zero (0) indicates no padding or truncating, just encrypt the given string as is. An empty string is never padded regardless of this value.

Returns:

byte[] - The encrypted string.

ascii2ebcdic

public static byte[] ascii2ebcdic(java.lang.String s)

Converts an ASCII string to an EBCDIC byte array.

Parameters:

s - (String) The string to convert.

Returns:

byte[] - The converted results.

ebcdic2ascii

public static java.lang.String ebcdic2ascii(byte[] b)

Converts an EBCDIC byte array to an ASCII string.

Parameters:

b - (byte[]) The byte array to convert.

Returns:

String - The converted results.

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.