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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8. Note: this package includes the NTRU encryption algorithms.

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package org.bouncycastle.crypto.modes;

import org.bouncycastle.crypto.BlockCipher;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.DataLengthException;
import org.bouncycastle.crypto.InvalidCipherTextException;

/**
 * A block cipher mode that includes authenticated encryption with a streaming mode and optional associated data.
 * 

* Implementations of this interface may operate in a packet mode (where all input data is buffered and * processed dugin the call to {@link #doFinal(byte[], int)}), or in a streaming mode (where output data is * incrementally produced with each call to {@link #processByte(byte, byte[], int)} or * {@link #processBytes(byte[], int, int, byte[], int)}. *

* This is important to consider during decryption: in a streaming mode, unauthenticated plaintext data * may be output prior to the call to {@link #doFinal(byte[], int)} that results in an authentication * failure. The higher level protocol utilising this cipher must ensure the plaintext data is handled * appropriately until the end of data is reached and the entire ciphertext is authenticated. * @see org.bouncycastle.crypto.params.AEADParameters */ public interface AEADBlockCipher { /** * initialise the underlying cipher. Parameter can either be an AEADParameters or a ParametersWithIV object. * * @param forEncryption true if we are setting up for encryption, false otherwise. * @param params the necessary parameters for the underlying cipher to be initialised. * @exception IllegalArgumentException if the params argument is inappropriate. */ public void init(boolean forEncryption, CipherParameters params) throws IllegalArgumentException; /** * Return the name of the algorithm. * * @return the algorithm name. */ public String getAlgorithmName(); /** * return the cipher this object wraps. * * @return the cipher this object wraps. */ public BlockCipher getUnderlyingCipher(); /** * Add a single byte to the associated data check. *
If the implementation supports it, this will be an online operation and will not retain the associated data. * * @param in the byte to be processed. */ public void processAADByte(byte in); /** * Add a sequence of bytes to the associated data check. *
If the implementation supports it, this will be an online operation and will not retain the associated data. * * @param in the input byte array. * @param inOff the offset into the in array where the data to be processed starts. * @param len the number of bytes to be processed. */ public void processAADBytes(byte[] in, int inOff, int len); /** * encrypt/decrypt a single byte. * * @param in the byte to be processed. * @param out the output buffer the processed byte goes into. * @param outOff the offset into the output byte array the processed data starts at. * @return the number of bytes written to out. * @exception DataLengthException if the output buffer is too small. */ public int processByte(byte in, byte[] out, int outOff) throws DataLengthException; /** * process a block of bytes from in putting the result into out. * * @param in the input byte array. * @param inOff the offset into the in array where the data to be processed starts. * @param len the number of bytes to be processed. * @param out the output buffer the processed bytes go into. * @param outOff the offset into the output byte array the processed data starts at. * @return the number of bytes written to out. * @exception DataLengthException if the output buffer is too small. */ public int processBytes(byte[] in, int inOff, int len, byte[] out, int outOff) throws DataLengthException; /** * Finish the operation either appending or verifying the MAC at the end of the data. * * @param out space for any resulting output data. * @param outOff offset into out to start copying the data at. * @return number of bytes written into out. * @throws IllegalStateException if the cipher is in an inappropriate state. * @throws org.bouncycastle.crypto.InvalidCipherTextException if the MAC fails to match. */ public int doFinal(byte[] out, int outOff) throws IllegalStateException, InvalidCipherTextException; /** * Return the value of the MAC associated with the last stream processed. * * @return MAC for plaintext data. */ public byte[] getMac(); /** * return the size of the output buffer required for a processBytes * an input of len bytes. *

* The returned size may be dependent on the initialisation of this cipher * and may not be accurate once subsequent input data is processed - this method * should be invoked immediately prior to input data being processed. *

* * @param len the length of the input. * @return the space required to accommodate a call to processBytes * with len bytes of input. */ public int getUpdateOutputSize(int len); /** * return the size of the output buffer required for a processBytes plus a * doFinal with an input of len bytes. *

* The returned size may be dependent on the initialisation of this cipher * and may not be accurate once subsequent input data is processed - this method * should be invoked immediately prior to a call to final processing of input data * and a call to {@link #doFinal(byte[], int)}. *

* @param len the length of the input. * @return the space required to accommodate a call to processBytes and doFinal * with len bytes of input. */ public int getOutputSize(int len); /** * Reset the cipher. After resetting the cipher is in the same state * as it was after the last init (if there was one). */ public void reset(); }




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