org.refcodes.forwardsecrecy

Class DecryptionProviderImpl

java.lang.Object

org.refcodes.forwardsecrecy.DecryptionProviderImpl

All Implemented Interfaces:

DecryptionProvider, org.refcodes.security.Decrypter<String,String,org.refcodes.security.DecryptionException>

public class DecryptionProviderImpl
extends Object
implements DecryptionProvider

This class is a basic implementation of the DecryptionProvider interface.

ATTENTION: This implementation does not take care of housekeeping. In case this class is to be run as a service, it must provide housekeeping facilities in terms of cleaning up instances contained in internal data structures (such as the hash maps) after a defined period of time those instance were not accessed.

Constructor Summary

Constructors

Constructor and Description
DecryptionProviderImpl(DecryptionService aDecryptionService) Constructs the DecryptionProvider using AES as implemented by the BouncyCastleProvider.
DecryptionProviderImpl(DecryptionService aDecryptionService, Provider aJceProvider, String aJceAlgorithm) Constructs the DecryptionProvider with the given DecryptionService and with the specified JCE Provider as well as the according JCE algorithm.

Method Summary

Modifier and Type	Method and Description
int	toDecrypted(byte[] aInput, int aInputOffset, int aInputLength, byte[] aOutput, int aOutputOffset)
String	toDecrypted(String aInput) Encrypts a text with the latest known valid cipher.

Methods inherited from class java.lang.Object

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

Constructor Detail

DecryptionProviderImpl

public DecryptionProviderImpl(DecryptionService aDecryptionService,
                              Provider aJceProvider,
                              String aJceAlgorithm)

Constructs the DecryptionProvider with the given DecryptionService and with the specified JCE Provider as well as the according JCE algorithm.

Parameters:

aDecryptionService - The DecryptionService to use for getting the known ciphers for decryption

aJceProvider - The JCE Provider to be used.

aJceAlgorithm - the JCE algorithm to be used by the JCE Provider.

DecryptionProviderImpl

public DecryptionProviderImpl(DecryptionService aDecryptionService)

Constructs the DecryptionProvider using AES as implemented by the BouncyCastleProvider.

Parameters:

aDecryptionService - The service to use for getting the known ciphers for decryption

Method Detail

toDecrypted

public String toDecrypted(String aInput)
                   throws UnknownCipherUidException,
                          NoCipherUidException

Encrypts a text with the latest known valid cipher.

Specified by:

toDecrypted in interface DecryptionProvider

Specified by:

toDecrypted in interface org.refcodes.security.Decrypter<String,String,org.refcodes.security.DecryptionException>

Parameters:

aInput - The text to be encrypted

Returns:

The encrypted text with a version prefixed identifying the cipher being used for encryption.

Throws:

UnknownCipherUidException - in case the cipher UID prefixed to the encrypted text is unknown

NoCipherUidException - in case no cipher UID was found prefixed to the provided text.

toDecrypted

public int toDecrypted(byte[] aInput,
                       int aInputOffset,
                       int aInputLength,
                       byte[] aOutput,
                       int aOutputOffset)
                throws ShortBufferException,
                       org.refcodes.security.DecryptionException

Specified by:

toDecrypted in interface org.refcodes.security.Decrypter<String,String,org.refcodes.security.DecryptionException>

Throws:

ShortBufferException

org.refcodes.security.DecryptionException