org.linguafranca.pwdb.security

Class Aes

java.lang.Object

org.linguafranca.pwdb.security.Aes

All Implemented Interfaces:

CipherAlgorithm, KeyDerivationFunction

public class Aes
extends Object
implements CipherAlgorithm, KeyDerivationFunction

AES may be used for Key Derivation and also as the underlying stream cipher

The class is a singleton

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Aes.KdfKeys v4 variant dictionary keys for use of AES as the KDF

Method Summary

Modifier and Type	Method and Description
VariantDictionary	createKdfParameters() get a copy of the Aes Variant dictionary
UUID	getCipherUuid() Returns the UUID of this algorithm
InputStream	getDecryptedInputStream(InputStream encryptedInputStream, byte[] key, byte[] iv) Create a decrypted stream from the supplied encrypted one
OutputStream	getEncryptedOutputStream(OutputStream decryptedOutputStream, byte[] key, byte[] iv) Create an encrypted stream from the supplied unencrypted one
static Aes	getInstance()
UUID	getKdfUuid() The UUID of this key derivation function
String	getName() Return the name of this algorithm
static byte[]	getTransformedKey(byte[] key, byte[] transformSeed, long transformRounds) Simplified version for KDBX V3
byte[]	getTransformedKey(byte[] key, VariantDictionary transformParams) Transform a key using this key derivation function

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static Aes getInstance()

createKdfParameters

public VariantDictionary createKdfParameters()

get a copy of the Aes Variant dictionary

Specified by:

createKdfParameters in interface KeyDerivationFunction

Returns:

a copy

getCipherUuid

public UUID getCipherUuid()

Description copied from interface: CipherAlgorithm

Returns the UUID of this algorithm

Specified by:

getCipherUuid in interface CipherAlgorithm

getName

public String getName()

Description copied from interface: CipherAlgorithm

Return the name of this algorithm

Specified by:

getName in interface CipherAlgorithm

Specified by:

getName in interface KeyDerivationFunction

getDecryptedInputStream

public InputStream getDecryptedInputStream(InputStream encryptedInputStream,
                                           byte[] key,
                                           byte[] iv)

Description copied from interface: CipherAlgorithm

Create a decrypted stream from the supplied encrypted one

Specified by:

getDecryptedInputStream in interface CipherAlgorithm

Parameters:

encryptedInputStream - an encrypted stream

key - the decryption key

iv - the iv

Returns:

an unencrypted stream

getEncryptedOutputStream

public OutputStream getEncryptedOutputStream(OutputStream decryptedOutputStream,
                                             byte[] key,
                                             byte[] iv)

Description copied from interface: CipherAlgorithm

Create an encrypted stream from the supplied unencrypted one

Specified by:

getEncryptedOutputStream in interface CipherAlgorithm

Parameters:

decryptedOutputStream - an unencrypted stream

key - a key

iv - an iv

Returns:

an encrypted stream

getKdfUuid

public UUID getKdfUuid()

Description copied from interface: KeyDerivationFunction

The UUID of this key derivation function

Specified by:

getKdfUuid in interface KeyDerivationFunction

getTransformedKey

public byte[] getTransformedKey(byte[] key,
                                VariantDictionary transformParams)

Description copied from interface: KeyDerivationFunction

Transform a key using this key derivation function

Specified by:

getTransformedKey in interface KeyDerivationFunction

Parameters:

key - the key to transform

transformParams - the parameters defining the way the transformation is to be carried out

Returns:

a transformed key

getTransformedKey

public static byte[] getTransformedKey(byte[] key,
                                       byte[] transformSeed,
                                       long transformRounds)

Simplified version for KDBX V3

Parameters:

key - the composite key

transformSeed - the seed

transformRounds - number of rounds

Returns:

a transformed key