de.alpharogroup.crypto.file

Class FileDecryptor

java.lang.Object

de.alpharogroup.crypto.core.AbstractCryptor<C,K>

de.alpharogroup.crypto.core.AbstractDecryptor<Cipher,String>

de.alpharogroup.crypto.core.AbstractFileDecryptor

de.alpharogroup.crypto.file.FileDecryptor

All Implemented Interfaces:

de.alpharogroup.crypto.api.Cryptor, de.alpharogroup.crypto.api.Decryptor<File,File>, de.alpharogroup.crypto.api.FileDecryptor, Serializable

public class FileDecryptor
extends AbstractFileDecryptor

The class FileDecryptor can decrypt files from the given crypt model bean.

See Also:

Serialized Form

Field Summary

Fields inherited from class de.alpharogroup.crypto.core.AbstractCryptor

model

Constructor Summary

Constructors

Constructor and Description
FileDecryptor(de.alpharogroup.crypto.model.CryptModel<Cipher,String> model) Instantiates a new FileDecryptor.
FileDecryptor(de.alpharogroup.crypto.model.CryptModel<Cipher,String> model, File decryptedFile) Instantiates a new file decryptor.

Method Summary

Modifier and Type	Method and Description
File	decrypt(File encrypted)
protected File	newDecryptedFile(String parent, String child) Factory method for creating the new decrypted File if it is not exists.

Methods inherited from class de.alpharogroup.crypto.core.AbstractFileDecryptor

newCipher, newCipher, newKeySpec

Methods inherited from class de.alpharogroup.crypto.core.AbstractDecryptor

newOperationMode

Methods inherited from class de.alpharogroup.crypto.core.AbstractCryptor

newAlgorithm, newAlgorithmParameterSpec, newCipher, newIterationCount, newSalt, newSecretKeyFactory, onInitialize

Methods inherited from class java.lang.Object

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

Constructor Detail

FileDecryptor

public FileDecryptor(de.alpharogroup.crypto.model.CryptModel<Cipher,String> model)
              throws InvalidKeyException,
                     NoSuchAlgorithmException,
                     InvalidKeySpecException,
                     NoSuchPaddingException,
                     InvalidAlgorithmParameterException,
                     UnsupportedEncodingException

Instantiates a new FileDecryptor.

Parameters:

model - the model

Throws:

InvalidKeyException - the invalid key exception

NoSuchAlgorithmException - is thrown if instantiation of the SecretKeyFactory object fails.

InvalidKeySpecException - is thrown if generation of the SecretKey object fails.

NoSuchPaddingException - the no such padding exception

InvalidAlgorithmParameterException - is thrown if initialization of the cypher object fails.

UnsupportedEncodingException - is thrown if the named charset is not supported.

FileDecryptor

public FileDecryptor(de.alpharogroup.crypto.model.CryptModel<Cipher,String> model,
                     File decryptedFile)
              throws InvalidKeyException,
                     NoSuchAlgorithmException,
                     InvalidKeySpecException,
                     NoSuchPaddingException,
                     InvalidAlgorithmParameterException,
                     UnsupportedEncodingException

Instantiates a new file decryptor.

Parameters:

model - the model

decryptedFile - is the target of the result from the decryption, if null the default file will be created. If null the name convention is given name of the encrypted file with the extension '.decrypted'.

Throws:

InvalidKeyException - the invalid key exception

NoSuchAlgorithmException - is thrown if instantiation of the SecretKeyFactory object fails.

InvalidKeySpecException - is thrown if generation of the SecretKey object fails.

NoSuchPaddingException - the no such padding exception

InvalidAlgorithmParameterException - is thrown if initialization of the cypher object fails.

UnsupportedEncodingException - is thrown if the named charset is not supported.

Method Detail

decrypt

public File decrypt(File encrypted)
             throws Exception

Throws:

Exception

newDecryptedFile

protected File newDecryptedFile(String parent,
                                String child)

Factory method for creating the new decrypted File if it is not exists. This method is invoked in the constructor from the derived classes and can be overridden so users can provide their own version of creating the new decrypted File

Parameters:

parent - the parent directory

child - the file name

Returns:

the new File object