net.sf.mmm.crypto.crypt

Class CryptorImplCombined

java.lang.Object

net.sf.mmm.crypto.algorithm.AbstractSecurityAlgorithm

net.sf.mmm.crypto.crypt.CryptorImplCombined

All Implemented Interfaces:

CryptoAlgorithm, AbstractGetNonceSize, Cryptor, CryptoProcessor

Direct Known Subclasses:

DecryptorImplCombined, EncryptorImplCombined

public abstract class CryptorImplCombined
extends AbstractSecurityAlgorithm
implements Cryptor

An implementation of Cryptor that combines multiple Cryptors.

Since:

1.0.0

Author:

Joerg Hohwiller (hohwille at users.sourceforge.net)

Field Summary

Fields

Modifier and Type	Field and Description
private Cryptor[]	cryptors

Constructor Summary

Constructors

Constructor and Description
CryptorImplCombined(Cryptor[] cryptors) The constructor.

Method Summary

Modifier and Type	Method and Description
byte[]	crypt(byte[] input, int offset, int length, boolean complete)
String	getAlgorithm()
protected Cryptor	getLastCryptor()
int	getNonceSize() Unlike Cipher this API is designed for ease of use.
void	reset() Will reset the internal state of this object.

Methods inherited from class net.sf.mmm.crypto.algorithm.AbstractSecurityAlgorithm

creationFailedException, creationFailedException, creationFailedException, creationFailedException, getAlgorithm, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.mmm.crypto.crypt.Cryptor

crypt, crypt, doFinal, process

Methods inherited from interface net.sf.mmm.crypto.CryptoProcessor

process, process, process

Field Detail

cryptors

private Cryptor[] cryptors

Constructor Detail

CryptorImplCombined

public CryptorImplCombined(Cryptor[] cryptors)

The constructor.

Parameters:

cryptors - the Cryptors to combine.

Method Detail

getAlgorithm

public String getAlgorithm()

Specified by:

getAlgorithm in interface CryptoAlgorithm

Returns:

the name of the underlying algorithm (e.g. "RSA", "NONEwithECDSA", etc.).

See Also:

Key.getAlgorithm(), Signature.getAlgorithm(), MessageDigest.getAlgorithm(), SecureRandom.getAlgorithm(), Cipher.getAlgorithm()

getNonceSize

public int getNonceSize()

Description copied from interface: AbstractGetNonceSize

Unlike Cipher this API is designed for ease of use. Some cryptographic algorithms require an initialization vector (IV) and others do not. With this API you do not have to care and cannot do things wrong. The nonce will be prepended automatically to the encrypted payload and reconstructed from there on decryption. This works both for crypt and for streaming.

Specified by:

getNonceSize in interface AbstractGetNonceSize

Returns:

the size of the nonce in bytes or 0 for none.

See Also:

Cipher.getIV()

getLastCryptor

protected Cryptor getLastCryptor()

Returns:

the last Cryptor from the chain.

crypt

public byte[] crypt(byte[] input,
                    int offset,
                    int length,
                    boolean complete)

Specified by:

crypt in interface Cryptor

Parameters:

input - the next chunk of data to encrypt or decrypt.

offset - the offset where to start in the input array.

length - the number of bytes to read from the input array.

complete - - true to complete the encryption or decryption in case this is the last chunk of data, false otherwise.

Returns:

the number of bytes that have been written into the output array.

See Also:

Cipher.update(byte[], int, int), Cipher.doFinal(byte[], int, int)

reset

public void reset()

Description copied from interface: CryptoProcessor

Will reset the internal state of this object. Please note that complex algorithms especially for Cryptor may not reusable. It is therefore preferable to always create a fresh instance for each cryptographic task.

Specified by:

reset in interface CryptoProcessor

See Also:

MessageDigest.reset()