Class JCECipherProvider

java.lang.Object

org.apache.derby.impl.services.jce.JCECipherProvider

All Implemented Interfaces:

CipherProvider

class JCECipherProvider
extends Object
implements CipherProvider

This is a wrapper for a Cipher

See Also:

• CipherFactory

Field Summary

Fields

Modifier and Type	Field	Description
private Cipher	cipher
private SecretKey	cryptixKey
private final int	encryptionBlockSize
private final IvParameterSpec	ivspec
private boolean	ivUsed
private int	mode
private boolean	sunjce

Constructor Summary

Constructors

Constructor	Description
JCECipherProvider(int mode, SecretKey secretKey, byte[] iv, String algorithm, String provider)

Method Summary

Modifier and Type	Method	Description
int	decrypt(byte[] ciphertext, int offset, int length, byte[] cleartext, int outputOffset)	Decrypt data - use only with Cipher that has been initialized with CipherFactory.DECRYPT.
int	encrypt(byte[] cleartext, int offset, int length, byte[] ciphertext, int outputOffset)	Encrypt data - use only with Cipher that has been initialized with CipherFactory.ENCRYPT.
int	getEncryptionBlockSize()	Returns the encryption block size used during creation of the encrypted database
(package private) boolean	verifyIV(byte[] IV)

Methods inherited from class Object

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

Field Details

cipher

private Cipher cipher

mode

private int mode

ivUsed

private boolean ivUsed

ivspec

private final IvParameterSpec ivspec

encryptionBlockSize

private final int encryptionBlockSize

sunjce

private boolean sunjce

cryptixKey

private SecretKey cryptixKey

Constructor Details

JCECipherProvider

JCECipherProvider(int mode,
 SecretKey secretKey,
 byte[] iv,
 String algorithm,
 String provider)
           throws StandardException

Throws:

StandardException

Method Details

encrypt

public int encrypt(byte[] cleartext,
 int offset,
 int length,
 byte[] ciphertext,
 int outputOffset)
            throws StandardException

Description copied from interface: CipherProvider

Encrypt data - use only with Cipher that has been initialized with CipherFactory.ENCRYPT.

Specified by:

encrypt in interface CipherProvider

Parameters:

cleartext - the byte array containing the cleartext

offset - encrypt from this byte offset in the cleartext

length - encrypt this many bytes starting from offset

ciphertext - the byte array to store the ciphertext

outputOffset - the offset into the ciphertext array the output should go If cleartext and ciphertext are the same array, caller must be careful to not overwrite the cleartext before it is scrambled.

Returns:

The number of bytes stored in ciphertext.

Throws:

StandardException - Standard Derby Error Policy

See Also:

• CipherProvider.encrypt(byte[], int, int, byte[], int)

decrypt

public int decrypt(byte[] ciphertext,
 int offset,
 int length,
 byte[] cleartext,
 int outputOffset)
            throws StandardException

Description copied from interface: CipherProvider

Decrypt data - use only with Cipher that has been initialized with CipherFactory.DECRYPT.

Specified by:

decrypt in interface CipherProvider

Parameters:

ciphertext - the byte array containing the ciphertext

offset - decrypt from this byte offset in the ciphertext

length - decrypt this many bytes starting from offset

cleartext - the byte array to store the cleartext

outputOffset - the offset into the cleartext array the output should go If cleartext and ciphertext are the same array, caller must be careful to not overwrite the ciphertext before it is un-scrambled.

Returns:

The number of bytes stored in cleartext.

Throws:

StandardException - Standard Derby Error Policy

See Also:

• CipherProvider.decrypt(byte[], int, int, byte[], int)

verifyIV

boolean verifyIV(byte[] IV)

getEncryptionBlockSize

public int getEncryptionBlockSize()

Description copied from interface: CipherProvider

Returns the encryption block size used during creation of the encrypted database

Specified by:

getEncryptionBlockSize in interface CipherProvider