Package org.conscrypt

Class OpenSSLCipherChaCha20

java.lang.Object

javax.crypto.CipherSpi

org.conscrypt.OpenSSLCipher

org.conscrypt.OpenSSLCipherChaCha20

@Internal
public class OpenSSLCipherChaCha20
extends OpenSSLCipher

Implementation of the ChaCha20 stream cipher.

Nested Class Summary

Nested classes/interfaces inherited from class org.conscrypt.OpenSSLCipher

OpenSSLCipher.Mode, OpenSSLCipher.Padding

Field Summary

Fields

Modifier and Type	Field	Description
private static int	BLOCK_SIZE_BYTES
private int	blockCounter
private int	currentBlockConsumedBytes
private static int	NONCE_SIZE_BYTES

Fields inherited from class org.conscrypt.OpenSSLCipher

encodedKey, iv, mode

Constructor Summary

Constructors

Constructor	Description
OpenSSLCipherChaCha20()

Method Summary

Modifier and Type	Method	Description
(package private) void	checkSupportedKeySize(int keySize)	Checks whether the cipher supports this particular keySize (in bytes) and throws InvalidKeyException if it doesn't.
(package private) void	checkSupportedMode(OpenSSLCipher.Mode mode)	Checks whether the cipher supports this particular cipher mode and throws NoSuchAlgorithmException if it doesn't.
(package private) void	checkSupportedPadding(OpenSSLCipher.Padding padding)	Checks whether the cipher supports this particular cipher padding and throws NoSuchPaddingException if it doesn't.
(package private) int	doFinalInternal(byte[] output, int outputOffset, int maximumLen)	API-specific implementation of the final block.
(package private) void	engineInitInternal(byte[] encodedKey, java.security.spec.AlgorithmParameterSpec params, java.security.SecureRandom random)	API-specific implementation of initializing the cipher.
(package private) java.lang.String	getBaseCipherName()	Returns the standard name for the particular algorithm.
(package private) int	getCipherBlockSize()
(package private) int	getOutputSizeForFinal(int inputLen)	The size of output if doFinal() is called with this inputLen.
(package private) int	getOutputSizeForUpdate(int inputLen)	The size of output if update() is called with this inputLen.
private void	reset()
(package private) int	updateInternal(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset, int maximumLen)	API-specific implementation of updating the cipher.

Methods inherited from class org.conscrypt.OpenSSLCipher

engineDoFinal, engineDoFinal, engineGetBlockSize, engineGetIV, engineGetKeySize, engineGetOutputSize, engineGetParameters, engineInit, engineInit, engineInit, engineSetMode, engineSetPadding, engineUnwrap, engineUpdate, engineUpdate, engineWrap, getPadding, getParameterSpec, isEncrypting, supportsVariableSizeIv, supportsVariableSizeKey

Methods inherited from class javax.crypto.CipherSpi

engineDoFinal, engineUpdate, engineUpdateAAD, engineUpdateAAD

Methods inherited from class java.lang.Object

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

Field Detail

BLOCK_SIZE_BYTES

private static final int BLOCK_SIZE_BYTES

See Also:

Constant Field Values

NONCE_SIZE_BYTES

private static final int NONCE_SIZE_BYTES

See Also:

Constant Field Values

currentBlockConsumedBytes

private int currentBlockConsumedBytes

blockCounter

private int blockCounter

Constructor Detail

OpenSSLCipherChaCha20

public OpenSSLCipherChaCha20()

Method Detail

engineInitInternal

void engineInitInternal(byte[] encodedKey,
                        java.security.spec.AlgorithmParameterSpec params,
                        java.security.SecureRandom random)
                 throws java.security.InvalidKeyException,
                        java.security.InvalidAlgorithmParameterException

Description copied from class: OpenSSLCipher

API-specific implementation of initializing the cipher. The OpenSSLCipher.isEncrypting() function will tell whether it should be initialized for encryption or decryption. The encodedKey will be the bytes of a supported key size.

Specified by:

engineInitInternal in class OpenSSLCipher

Throws:

java.security.InvalidKeyException

java.security.InvalidAlgorithmParameterException

updateInternal

int updateInternal(byte[] input,
                   int inputOffset,
                   int inputLen,
                   byte[] output,
                   int outputOffset,
                   int maximumLen)
            throws javax.crypto.ShortBufferException

Description copied from class: OpenSSLCipher

API-specific implementation of updating the cipher. The maximumLen will be the maximum length of the output as returned by OpenSSLCipher.getOutputSizeForUpdate(int). The return value must be the number of bytes processed and placed into output. On error, an exception must be thrown.

Specified by:

updateInternal in class OpenSSLCipher

Throws:

javax.crypto.ShortBufferException

doFinalInternal

int doFinalInternal(byte[] output,
                    int outputOffset,
                    int maximumLen)
             throws javax.crypto.IllegalBlockSizeException,
                    javax.crypto.BadPaddingException,
                    javax.crypto.ShortBufferException

Description copied from class: OpenSSLCipher

API-specific implementation of the final block. The maximumLen will be the maximum length of the possible output as returned by OpenSSLCipher.getOutputSizeForFinal(int). The return value must be the number of bytes processed and placed into output. On error, an exception must be thrown.

Specified by:

doFinalInternal in class OpenSSLCipher

Throws:

javax.crypto.IllegalBlockSizeException

javax.crypto.BadPaddingException

javax.crypto.ShortBufferException

reset

private void reset()

getBaseCipherName

java.lang.String getBaseCipherName()

Description copied from class: OpenSSLCipher

Returns the standard name for the particular algorithm.

Specified by:

getBaseCipherName in class OpenSSLCipher

checkSupportedKeySize

void checkSupportedKeySize(int keySize)
                    throws java.security.InvalidKeyException

Description copied from class: OpenSSLCipher

Checks whether the cipher supports this particular keySize (in bytes) and throws InvalidKeyException if it doesn't.

Specified by:

checkSupportedKeySize in class OpenSSLCipher

Throws:

java.security.InvalidKeyException

checkSupportedMode

void checkSupportedMode(OpenSSLCipher.Mode mode)
                 throws java.security.NoSuchAlgorithmException

Description copied from class: OpenSSLCipher

Checks whether the cipher supports this particular cipher mode and throws NoSuchAlgorithmException if it doesn't.

Specified by:

checkSupportedMode in class OpenSSLCipher

Throws:

java.security.NoSuchAlgorithmException

checkSupportedPadding

void checkSupportedPadding(OpenSSLCipher.Padding padding)
                    throws javax.crypto.NoSuchPaddingException

Description copied from class: OpenSSLCipher

Checks whether the cipher supports this particular cipher padding and throws NoSuchPaddingException if it doesn't.

Specified by:

checkSupportedPadding in class OpenSSLCipher

Throws:

javax.crypto.NoSuchPaddingException

getCipherBlockSize

int getCipherBlockSize()

Specified by:

getCipherBlockSize in class OpenSSLCipher

getOutputSizeForFinal

int getOutputSizeForFinal(int inputLen)

Description copied from class: OpenSSLCipher

The size of output if doFinal() is called with this inputLen. If padding is enabled and the size of the input puts it right at the block size, it will add another block for the padding.

Specified by:

getOutputSizeForFinal in class OpenSSLCipher

getOutputSizeForUpdate

int getOutputSizeForUpdate(int inputLen)

Description copied from class: OpenSSLCipher

The size of output if update() is called with this inputLen. If padding is enabled and the size of the input puts it right at the block size, it will add another block for the padding.

Specified by:

getOutputSizeForUpdate in class OpenSSLCipher