anon.client.crypto

Class SymCipher

java.lang.Object

anon.client.crypto.SymCipher

All Implemented Interfaces:

ISymCipher

public final class SymCipher
extends java.lang.Object
implements ISymCipher

Field Summary

Fields

Modifier and Type	Field and Description
static int	CTR
static int	NO_ENCRYPTION
static int	OFB
static int	UNKNOWN_ALGORITHM

Constructor Summary

Constructors

Constructor and Description
SymCipher() Creates a new SymCipher object with two AES engines and two zero'd initialization vectors.

Method Summary

Modifier and Type	Method and Description
int	encryptAES1(byte[] src, int s_offset, byte[] dest, int d_offset, int len) The AES encryption uses a Output Feedback Block Cipher.
int	encryptAES2(byte[] buff) The AES encryption uses a Output Feedback Block Cipher.
static int	getAlgorithmForName(java.lang.String strAlg)
byte[]	getKeys() Returns the currently used key(s) for encryption.
int	setEncryptionKeyAES(byte[] key) Sets the AES encryption key to the first 16 byte of the the key buffer.
int	setEncryptionKeyAES(byte[] key, int offset, int len)
int	setEncryptionKeysAES(byte[] keys) Set both keys to different value, if keys.length==2* KEY_SIZE, else set both keys to the same value
void	setIV2(byte[] buff)

Methods inherited from class java.lang.Object

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

Field Detail

NO_ENCRYPTION

public static final int NO_ENCRYPTION

See Also:

Constant Field Values

OFB

public static final int OFB

See Also:

Constant Field Values

CTR

public static final int CTR

See Also:

Constant Field Values

UNKNOWN_ALGORITHM

public static final int UNKNOWN_ALGORITHM

See Also:

Constant Field Values

Constructor Detail

SymCipher

public SymCipher()

Creates a new SymCipher object with two AES engines and two zero'd initialization vectors.

Method Detail

setEncryptionKeyAES

public int setEncryptionKeyAES(byte[] key)

Sets the AES encryption key to the first 16 byte of the the key buffer.

Specified by:

setEncryptionKeyAES in interface ISymCipher

Returns:

0 if successful, -1 if an error occurred

setEncryptionKeyAES

public int setEncryptionKeyAES(byte[] key,
                               int offset,
                               int len)

Specified by:

setEncryptionKeyAES in interface ISymCipher

Parameters:

key - byte[]

offset - int

len - int if len==16 --> only the key is set; if len==32 --> key and IV is set

Returns:

int

setEncryptionKeysAES

public int setEncryptionKeysAES(byte[] keys)

Description copied from interface: ISymCipher

Set both keys to different value, if keys.length==2* KEY_SIZE, else set both keys to the same value

Specified by:

setEncryptionKeysAES in interface ISymCipher

Parameters:

keys - byte[]

Returns:

int

getKeys

public byte[] getKeys()

Description copied from interface: ISymCipher

Returns the currently used key(s) for encryption. If both keys are set, then an array of 32 byte is returned, otherwise an array of 16 bytes is.

Specified by:

getKeys in interface ISymCipher

Returns:

The current key(s) used for encryption or null, if no key is set.

setIV2

public void setIV2(byte[] buff)

Specified by:

setIV2 in interface ISymCipher

encryptAES1

public int encryptAES1(byte[] src,
                       int s_offset,
                       byte[] dest,
                       int d_offset,
                       int len)

The AES encryption uses a Output Feedback Block Cipher. This method uses Key 1 and IV 1.

Specified by:

encryptAES1 in interface ISymCipher

encryptAES2

public int encryptAES2(byte[] buff)

The AES encryption uses a Output Feedback Block Cipher. This method uses Key 2 and IV 2. The IVs get initialized to the same value, but allow for 2 different OFB Streams. The buffer gets overwritten with the encrypted packet.

Specified by:

encryptAES2 in interface ISymCipher

getAlgorithmForName

public static int getAlgorithmForName(java.lang.String strAlg)