lumis.portal.crypto
Class AbstractCipher

java.lang.Object
  lumis.portal.crypto.AbstractCipher

All Implemented Interfaces:

ICipher, ICipherSpi

Direct Known Subclasses:

MessageDigestCipher, SymmetricCipher

public abstract class AbstractCipher
extends Object
implements ICipherSpi

An abstract ICipher implementation for easing concrete implementations.

This abstract class provides implementations for the string-based encryption and decryption operations, by encoding the encrypted bytes in Base64.

Since:

5.5.0

Constructor Summary

AbstractCipher()

Method Summary

String	decrypt(String value) Decrypts a string.
String	encrypt(String value) Encrypts a string.
protected String	getStringCharset() The charset used to perform the encoding between String and bytes of the plain text string values in encrypt(String) and decrypt(String).
protected boolean	getUseURLSafeBase64Variant() Indicates if a URL safe Base64 variant is to be used when encoding bytes to String.

Methods inherited from class java.lang.Object

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

Methods inherited from interface lumis.portal.crypto.ICipherSpi

init

Methods inherited from interface lumis.portal.crypto.ICipher

decrypt, encrypt

Constructor Detail

AbstractCipher

public AbstractCipher()

Method Detail

getStringCharset

protected String getStringCharset()

The charset used to perform the encoding between String and bytes of the plain text string values in encrypt(String) and decrypt(String).

The default value is UTF-8. This method may be overridden to change it.

Returns:

the charset.

Since:

5.5.0

getUseURLSafeBase64Variant

protected boolean getUseURLSafeBase64Variant()

Indicates if a URL safe Base64 variant is to be used when encoding bytes to String.

The default value is true. This method may be overridden to change it.

Returns:

true if a URL safe variant is to be used, false if the standard Base64 is to be used.

Since:

5.5.0

encrypt

public String encrypt(String value)

Encrypts a string.

This abstract implementation converts the given string to bytes based on getStringCharset(), encrypts it with ICipher.encrypt(byte[]), and encodes the result to a string using the Base64 algorithm.

Specified by:

encrypt in interface ICipher

Parameters:

value - the original string.

Returns:

the encrypted string.

Since:

5.5.0

decrypt

public String decrypt(String value)
               throws InvalidEncryptedValueException

Decrypts a string.

This abstract implementation decodes the value to bytes using the Base64 algorithm, decrypts it with ICipher.decrypt(byte[]), and creates the resulting plain text string based on getStringCharset().

Specified by:

decrypt in interface ICipher

Parameters:

value - the encrypted string.

Returns:

the string decrypted.

Throws:

InvalidEncryptedValueException - if value is incompatible with this cipher (probably was not encrypted by it or is corrupted).

Since:

5.5.0