Package net.randombit.botan.seckey.block

Class BotanBlockCipher

java.lang.Object

javax.crypto.CipherSpi

net.randombit.botan.seckey.BotanBaseAsymmetricCipher

net.randombit.botan.seckey.block.BotanBlockCipher

Direct Known Subclasses:

BotanAeadCipher, BotanBlockCipher.AesCbc, BotanBlockCipher.AesCfb, BotanBlockCipher.DesCbc, BotanBlockCipher.DesCfb, BotanBlockCipher.DesEdeCbc, BotanBlockCipher.DesEdeCfb

public abstract class BotanBlockCipher
extends BotanBaseAsymmetricCipher

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	BotanBlockCipher.AesCbc
static final class	BotanBlockCipher.AesCfb
static final class	BotanBlockCipher.DesCbc
static final class	BotanBlockCipher.DesCfb
static final class	BotanBlockCipher.DesEdeCbc
static final class	BotanBlockCipher.DesEdeCfb

Field Summary

Fields

Modifier and Type	Field	Description
protected byte[]	buffer	Native botan_cipher_update() will be called only with blocks of size updateGranularity.
protected final CipherMode	cipherMode	Holds the CipherMode.
protected PaddingAlgorithm	padding	Holds the padding algorithm (e.g.
protected int	updateGranularity	Botan update granularity for this cipher. botan_cipher_update() must be called with blocks of this size, except for doFinal().

Fields inherited from class net.randombit.botan.seckey.BotanBaseAsymmetricCipher

cipherRef, iv, mode, name

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BotanBlockCipher(String name, CipherMode cipherMode, int blockSize)

Method Summary

Modifier and Type	Method	Description
protected byte[]	engineDoFinal(byte[] input, int inputOffset, int inputLen)
protected int	engineGetBlockSize()
protected int	engineGetOutputSize(int inputLen)
protected void	engineInit(int opmode, Key key, SecureRandom random)
protected void	engineReset()
protected void	engineSetPadding(String padding)
protected byte[]	engineUpdate(byte[] input, int inputOffset, int inputLen)
protected boolean	isValidNonceLength(int nonceLength)	Checks whether the given nonce size is supported.
protected abstract boolean	requiresDataBlockAligned()	Whether the operation modes requires data block aligned or not.

Methods inherited from class net.randombit.botan.seckey.BotanBaseAsymmetricCipher

clone, doCipher, engineDoFinal, engineGetIV, engineGetParameters, engineInit, engineInit, engineSetMode, engineUpdate, getBotanCipherName, isDecrypting

Methods inherited from class javax.crypto.CipherSpi

engineDoFinal, engineGetKeySize, engineUnwrap, engineUpdate, engineUpdateAAD, engineUpdateAAD, engineWrap

Methods inherited from class java.lang.Object

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

Field Details

cipherMode

protected final CipherMode cipherMode

Holds the CipherMode.

padding

protected PaddingAlgorithm padding

Holds the padding algorithm (e.g. PKCS5)

updateGranularity

protected int updateGranularity

Botan update granularity for this cipher. botan_cipher_update() must be called with blocks of this size, except for doFinal().

buffer

protected byte[] buffer

Native botan_cipher_update() will be called only with blocks of size updateGranularity. The rest will be held until the next update or doFinal call.

Constructor Details

BotanBlockCipher

protected BotanBlockCipher(String name,
 CipherMode cipherMode,
 int blockSize)

Method Details

requiresDataBlockAligned

protected abstract boolean requiresDataBlockAligned()

Whether the operation modes requires data block aligned or not.

Returns:

true if data must be block size aligned, false otherwise.

engineSetPadding

protected void engineSetPadding(String padding)
                         throws NoSuchPaddingException

Specified by:

engineSetPadding in class CipherSpi

Throws:

NoSuchPaddingException

engineGetBlockSize

protected int engineGetBlockSize()

Specified by:

engineGetBlockSize in class CipherSpi

engineGetOutputSize

protected int engineGetOutputSize(int inputLen)

Specified by:

engineGetOutputSize in class CipherSpi

engineInit

protected void engineInit(int opmode,
 Key key,
 SecureRandom random)
                   throws InvalidKeyException

Overrides:

engineInit in class BotanBaseAsymmetricCipher

Throws:

InvalidKeyException

engineUpdate

protected byte[] engineUpdate(byte[] input,
 int inputOffset,
 int inputLen)

Specified by:

engineUpdate in class CipherSpi

engineDoFinal

protected byte[] engineDoFinal(byte[] input,
 int inputOffset,
 int inputLen)
                        throws IllegalBlockSizeException

Specified by:

engineDoFinal in class BotanBaseAsymmetricCipher

Throws:

IllegalBlockSizeException

engineReset

protected void engineReset()

Overrides:

engineReset in class BotanBaseAsymmetricCipher

isValidNonceLength

protected boolean isValidNonceLength(int nonceLength)

Description copied from class: BotanBaseAsymmetricCipher

Checks whether the given nonce size is supported.

Specified by:

isValidNonceLength in class BotanBaseAsymmetricCipher

Parameters:

nonceLength - the nonce length

Returns:

True is the given nonce length is supported, False otherwise.