org.spongycastle.crypto

Interface StreamCipher

All Known Subinterfaces:

SkippingStreamCipher

All Known Implementing Classes:

CFBBlockCipher, ChaCha7539Engine, ChaChaEngine, GCFBBlockCipher, GOFBBlockCipher, Grain128Engine, Grainv1Engine, HC128Engine, HC256Engine, ISAACEngine, KCTRBlockCipher, OFBBlockCipher, RC4Engine, Salsa20Engine, SICBlockCipher, StreamBlockCipher, VMPCEngine, VMPCKSA3Engine, XSalsa20Engine

public interface StreamCipher

the interface stream ciphers conform to.

Method Summary

Modifier and Type	Method and Description
java.lang.String	getAlgorithmName() Return the name of the algorithm the cipher implements.
void	init(boolean forEncryption, CipherParameters params) Initialise the cipher.
int	processBytes(byte[] in, int inOff, int len, byte[] out, int outOff) process a block of bytes from in putting the result into out.
void	reset() reset the cipher.
byte	returnByte(byte in) encrypt/decrypt a single byte returning the result.

Method Detail

init

void init(boolean forEncryption,
          CipherParameters params)
   throws java.lang.IllegalArgumentException

Initialise the cipher.

Parameters:

forEncryption - if true the cipher is initialised for encryption, if false for decryption.

params - the key and other data required by the cipher.

Throws:

java.lang.IllegalArgumentException - if the params argument is inappropriate.

getAlgorithmName

java.lang.String getAlgorithmName()

Return the name of the algorithm the cipher implements.

Returns:

the name of the algorithm the cipher implements.

returnByte

byte returnByte(byte in)

encrypt/decrypt a single byte returning the result.

Parameters:

in - the byte to be processed.

Returns:

the result of processing the input byte.

processBytes

int processBytes(byte[] in,
                 int inOff,
                 int len,
                 byte[] out,
                 int outOff)
          throws DataLengthException

process a block of bytes from in putting the result into out.

Parameters:

in - the input byte array.

inOff - the offset into the in array where the data to be processed starts.

len - the number of bytes to be processed.

out - the output buffer the processed bytes go into.

outOff - the offset into the output byte array the processed data starts at.

Returns:

the number of bytes produced - should always be len.

Throws:

DataLengthException - if the output buffer is too small.

reset

void reset()

reset the cipher. This leaves it in the same state it was at after the last init (if there was one).