net.sourceforge.jcetaglib.jsp20
Class ELFunctions

java.lang.Object
  net.sourceforge.jcetaglib.jsp20.ELFunctions

public class ELFunctions

extends java.lang.Object

JSP 2.0 EL (Expression Language) based JCE functions

Version:

$Id: ELFunctions.java,v 1.1 2004/04/14 09:48:29 hamgert Exp $

Author:

Gert Van Ham, hamgert@users.sourceforge.net, http://jcetaglib.sourceforge.net

Constructor Summary

ELFunctions()

Method Summary

static java.lang.String	decrypt(java.lang.String ciphertext, java.lang.String keyfile, java.lang.String passphrase, java.lang.String algorithm, java.lang.String mode, java.lang.String padding) Decrypts a ciphered BASE64 string with a symmetric key
static java.lang.String	digest(java.lang.String text, java.lang.String algorithm) Creates a digest from a string
static java.lang.String	encrypt(java.lang.String text, java.lang.String keyfile, java.lang.String passphrase, java.lang.String algorithm, java.lang.String mode, java.lang.String padding) Encrypts a string with a symmetric key and returns the ciphered text in BASE64 format.
static java.lang.String	formdigest(java.lang.String text, java.lang.String digest, java.lang.String keyfile, java.lang.String passphrase, java.lang.String algorithm) Creates a form digest from a parameter string
static java.lang.String	mac(java.lang.String text, java.lang.String keyfile, java.lang.String passphrase, java.lang.String algorithm, java.lang.String macname) Create a MAC from a string
static java.lang.String	pbedecrypt(java.lang.String ciphertext, java.lang.String passphrase, java.lang.String algorithm) Decrypts a ciphered BASE64 string with PBE
static java.lang.String	pbeencrypt(java.lang.String text, java.lang.String passphrase, java.lang.String algorithm) Encrypts a string with PBE and returns the ciphered text in BASE64 format.

Methods inherited from class java.lang.Object

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

Constructor Detail

ELFunctions

public ELFunctions()

Method Detail

digest

public static java.lang.String digest(java.lang.String text,
                                      java.lang.String algorithm)
                               throws CryptoException

Creates a digest from a string

Parameters:

text - creates the digest from this text

algorithm - the digest algorithm. 'SHA-1' if null

Returns:

the generated digest string in BASE64

Throws:

CryptoException - for all encryption errors

formdigest

public static java.lang.String formdigest(java.lang.String text,
                                          java.lang.String digest,
                                          java.lang.String keyfile,
                                          java.lang.String passphrase,
                                          java.lang.String algorithm)
                                   throws CryptoException,
                                          java.io.IOException

Creates a form digest from a parameter string

Parameters:

text - create the form digest from this parameter string

digest - the digest algorithm. 'SHA-1' if null

keyfile - the symmetric key file

passphrase - the symmetric key file passphrase

algorithm - the symmetric key algorithm

Returns:

form digest in BASE64 format

Throws:

CryptoException - for all encryption errors

java.io.IOException - I/O errors

pbeencrypt

public static java.lang.String pbeencrypt(java.lang.String text,
                                          java.lang.String passphrase,
                                          java.lang.String algorithm)
                                   throws CryptoException

Encrypts a string with PBE and returns the ciphered text in BASE64 format.

Parameters:

text - the plain text

passphrase - the password or passphrase

algorithm - the PBE algorithm. "PBEWithSHAAndIDEA-CBC" if null

Returns:

the cipherstring in BASE64 format

Throws:

CryptoException - for all encryption errors

pbedecrypt

public static java.lang.String pbedecrypt(java.lang.String ciphertext,
                                          java.lang.String passphrase,
                                          java.lang.String algorithm)
                                   throws CryptoException

Decrypts a ciphered BASE64 string with PBE

Parameters:

ciphertext - the text to decipher

passphrase - password or passphrase

algorithm - the PBE algorithm. "PBEWithSHAAndIDEA-CBC" if null

Returns:

the plain text

Throws:

CryptoException - for all encryption errors

encrypt

public static java.lang.String encrypt(java.lang.String text,
                                       java.lang.String keyfile,
                                       java.lang.String passphrase,
                                       java.lang.String algorithm,
                                       java.lang.String mode,
                                       java.lang.String padding)
                                throws CryptoException,
                                       KeystoreException

Encrypts a string with a symmetric key and returns the ciphered text in BASE64 format.

Parameters:

text - the string to encrypt

keyfile - the symmetric key file

passphrase - symmetric key file passphrase

algorithm - symmetric key file algorithm. AES if null

mode - encryption mode. CBC if null

padding - encryption padding. PKCS7Padding if null

Returns:

the encrypted text in BASE64 format

Throws:

CryptoException - encryption errors

KeystoreException - keystore errors

decrypt

public static java.lang.String decrypt(java.lang.String ciphertext,
                                       java.lang.String keyfile,
                                       java.lang.String passphrase,
                                       java.lang.String algorithm,
                                       java.lang.String mode,
                                       java.lang.String padding)
                                throws CryptoException,
                                       KeystoreException

Decrypts a ciphered BASE64 string with a symmetric key

Parameters:

ciphertext - the ciphered BASE64 string

keyfile - the symmetric key file

passphrase - symmetric key file passphrase

algorithm - symmetric key file algorithm. AES if null

mode - encryption mode. CBC if null

padding - encryption padding. PKCS7Padding if null

Returns:

the plaintext

Throws:

CryptoException - encryption errors

KeystoreException - keystore errors

mac

public static java.lang.String mac(java.lang.String text,
                                   java.lang.String keyfile,
                                   java.lang.String passphrase,
                                   java.lang.String algorithm,
                                   java.lang.String macname)
                            throws CryptoException

Create a MAC from a string

Parameters:

text - the text string

keyfile - the symmetric key file location

passphrase - the symmetric key file passphrase

algorithm - the symmetric key file algorithm

macname - MAC algorithm. "HMac-SHA512" if null

Returns:

MAC code

Throws:

CryptoException - MAC errors