org.spongycastle.tls.crypto.impl

Interface TlsAEADCipherImpl

All Known Implementing Classes:

BcChaCha20Poly1305, BcTlsCrypto.AeadOperator, JceAEADCipherImpl, JceChaCha20Poly1305

public interface TlsAEADCipherImpl

Base interface for services supporting AEAD encryption/decryption.

Method Summary

Modifier and Type	Method and 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.

Method Detail

setKey

void setKey(byte[] key,
            int keyOff,
            int keyLen)
     throws java.io.IOException

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

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.

Throws:

java.io.IOException

init

void init(byte[] nonce,
          int macSize,
          byte[] additionalData)
   throws java.io.IOException

Initialise the parameters for the AEAD operator.

Parameters:

nonce - the nonce.

macSize - MAC size in bytes.

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

Throws:

java.io.IOException - if the parameters are inappropriate.

getOutputSize

int getOutputSize(int inputLength)

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

Parameters:

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

Returns:

the maximum size of the output.

doFinal

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

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.

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.