Package org.bouncycastle.tls.crypto.impl.jcajce

Class JceAEADCipherImpl

java.lang.Object

org.bouncycastle.tls.crypto.impl.jcajce.JceAEADCipherImpl

All Implemented Interfaces:

TlsAEADCipherImpl

public class JceAEADCipherImpl
extends java.lang.Object
implements TlsAEADCipherImpl

A basic wrapper for a JCE Cipher class to provide the needed AEAD cipher functionality for TLS.

Constructor Summary

Constructors

Constructor	Description
JceAEADCipherImpl(org.bouncycastle.jcajce.util.JcaJceHelper helper, java.lang.String cipherName, java.lang.String algorithm, int keySize, boolean isEncrypting)

Method Summary

Modifier and Type	Method	Description
int	doFinal(byte[] input, int inputOffset, int inputLength, byte[] output, int outputOffset)	Perform the cipher encryption/decryption returning the output in output.
int	getOutputSize(int inputLength)	Return the maximum size of the output for input of inputLength bytes.
void	init(byte[] nonce, int macSize, byte[] additionalData)	Initialise the parameters for the AEAD operator.
void	setKey(byte[] key, int keyOff, int keyLen)	Set the key to be used by the AEAD cipher implementation supporting this service.

Methods inherited from class java.lang.Object

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

Constructor Detail

JceAEADCipherImpl

public JceAEADCipherImpl(org.bouncycastle.jcajce.util.JcaJceHelper helper,
                         java.lang.String cipherName,
                         java.lang.String algorithm,
                         int keySize,
                         boolean isEncrypting)
                  throws java.security.GeneralSecurityException

Throws:

java.security.GeneralSecurityException

Method Detail

setKey

public void setKey(byte[] key,
                   int keyOff,
                   int keyLen)

Description copied from interface: TlsAEADCipherImpl

Set the key to be used by the AEAD cipher implementation supporting this service.

Specified by:

setKey in interface TlsAEADCipherImpl

Parameters:

key - array holding the AEAD cipher key.

keyOff - offset into the array the key starts at.

keyLen - length of the key in the array.

init

public void init(byte[] nonce,
                 int macSize,
                 byte[] additionalData)

Description copied from interface: TlsAEADCipherImpl

Initialise the parameters for the AEAD operator.

Specified by:

init in interface TlsAEADCipherImpl

Parameters:

nonce - the nonce.

macSize - MAC size in bytes.

additionalData - any additional data to be included in the MAC calculation.

getOutputSize

public int getOutputSize(int inputLength)

Description copied from interface: TlsAEADCipherImpl

Return the maximum size of the output for input of inputLength bytes.

Specified by:

getOutputSize in interface TlsAEADCipherImpl

Parameters:

inputLength - the length (in bytes) of the proposed input.

Returns:

the maximum size of the output.

doFinal

public int doFinal(byte[] input,
                   int inputOffset,
                   int inputLength,
                   byte[] output,
                   int outputOffset)
            throws java.io.IOException

Description copied from interface: TlsAEADCipherImpl

Perform the cipher encryption/decryption returning the output in output.

Note: we have to use doFinal() here as it is the only way to guarantee output from the underlying cipher.

Specified by:

doFinal in interface TlsAEADCipherImpl

Parameters:

input - array holding input data to the cipher.

inputOffset - offset into input array data starts at.

inputLength - length of the input data in the array.

output - array to hold the cipher output.

outputOffset - offset into output array to start saving output.

Returns:

the amount of data written to output.

Throws:

java.io.IOException - in case of failure.