org.bouncycastle.crypto.modes

Class KGCMBlockCipher

java.lang.Object

org.bouncycastle.crypto.modes.KGCMBlockCipher

All Implemented Interfaces:

AEADBlockCipher, AEADCipher

public class KGCMBlockCipher
extends java.lang.Object
implements AEADBlockCipher

Implementation of DSTU7624 GCM mode.

Partial-block / interop caveat: associated data and payload whose length is not a multiple of the underlying block size are authenticated following the generic GCM/GMAC construction (NIST SP 800-38D): the trailing partial block is zero-padded for the GF(2^n) multiplication, and the true bit-length is bound by the trailing lambda field. DSTU 7624:2014 does not publish a partial-block GCM/GMAC test vector, so this behaviour is verified by round-trip self-consistency only and has not been confirmed against an independent conformant DSTU 7624 implementation. See github #287.

Constructor Summary

Constructors

Constructor and Description
KGCMBlockCipher(BlockCipher dstu7624Engine)

Method Summary

Modifier and Type	Method and Description
int	doFinal(byte[] out, int outOff) Finish the operation either appending or verifying the MAC at the end of the data.
java.lang.String	getAlgorithmName() Return the name of the algorithm.
byte[]	getMac() Return the value of the MAC associated with the last stream processed.
int	getOutputSize(int len) return the size of the output buffer required for a processBytes plus a doFinal with an input of len bytes.
BlockCipher	getUnderlyingCipher() return the BlockCipher this object wraps.
int	getUpdateOutputSize(int len) return the size of the output buffer required for a processBytes an input of len bytes.
void	init(boolean forEncryption, CipherParameters params) initialise the underlying cipher.
void	processAADByte(byte in) Add a single byte to the associated data check.
void	processAADBytes(byte[] in, int inOff, int len) Add a sequence of bytes to the associated data check.
int	processByte(byte in, byte[] out, int outOff) encrypt/decrypt a single byte.
int	processBytes(byte[] in, int inOff, int inLen, byte[] out, int outOff) process a block of bytes from in putting the result into out.
void	reset() Reset the cipher.

Methods inherited from class java.lang.Object

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

Constructor Detail

KGCMBlockCipher

public KGCMBlockCipher(BlockCipher dstu7624Engine)

Method Detail

init

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

Description copied from interface: AEADCipher

initialise the underlying cipher. Parameter can either be an AEADParameters or a ParametersWithIV object.

Specified by:

init in interface AEADCipher

Parameters:

forEncryption - true if we are setting up for encryption, false otherwise.

params - the necessary parameters for the underlying cipher to be initialised.

Throws:

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

getAlgorithmName

public java.lang.String getAlgorithmName()

Description copied from interface: AEADCipher

Return the name of the algorithm.

Specified by:

getAlgorithmName in interface AEADCipher

Returns:

the algorithm name.

getUnderlyingCipher

public BlockCipher getUnderlyingCipher()

Description copied from interface: AEADBlockCipher

return the BlockCipher this object wraps.

Specified by:

getUnderlyingCipher in interface AEADBlockCipher

Returns:

the BlockCipher this object wraps.

processAADByte

public void processAADByte(byte in)

Description copied from interface: AEADCipher

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.

Specified by:

processAADByte in interface AEADCipher

Parameters:

in - the byte to be processed.

processAADBytes

public void processAADBytes(byte[] in,
                            int inOff,
                            int len)

Description copied from interface: AEADCipher

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.

Specified by:

processAADBytes in interface AEADCipher

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.

processByte

public int processByte(byte in,
                       byte[] out,
                       int outOff)
                throws DataLengthException,
                       java.lang.IllegalStateException

Description copied from interface: AEADCipher

encrypt/decrypt a single byte.

Specified by:

processByte in interface AEADCipher

Parameters:

in - the byte to be processed.

out - the output buffer the processed byte goes into.

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

Returns:

the number of bytes written to out.

Throws:

DataLengthException - if the output buffer is too small.

java.lang.IllegalStateException

processBytes

public int processBytes(byte[] in,
                        int inOff,
                        int inLen,
                        byte[] out,
                        int outOff)
                 throws DataLengthException,
                        java.lang.IllegalStateException

Description copied from interface: AEADCipher

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

Specified by:

processBytes in interface AEADCipher

Parameters:

in - the input byte array.

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

inLen - 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 written to out.

Throws:

DataLengthException - if the output buffer is too small.

java.lang.IllegalStateException

doFinal

public int doFinal(byte[] out,
                   int outOff)
            throws java.lang.IllegalStateException,
                   InvalidCipherTextException

Description copied from interface: AEADCipher

Finish the operation either appending or verifying the MAC at the end of the data.

Specified by:

doFinal in interface AEADCipher

Parameters:

out - space for any resulting output data.

outOff - offset into out to start copying the data at.

Returns:

number of bytes written into out.

Throws:

java.lang.IllegalStateException - if the cipher is in an inappropriate state.

InvalidCipherTextException - if the MAC fails to match.

getMac

public byte[] getMac()

Description copied from interface: AEADCipher

Return the value of the MAC associated with the last stream processed.

Specified by:

getMac in interface AEADCipher

Returns:

MAC for plaintext data.

getUpdateOutputSize

public int getUpdateOutputSize(int len)

Description copied from interface: AEADCipher

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.

Specified by:

getUpdateOutputSize in interface AEADCipher

Parameters:

len - the length of the input.

Returns:

the space required to accommodate a call to processBytes with len bytes of input.

getOutputSize

public int getOutputSize(int len)

Description copied from interface: AEADCipher

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 AEADCipher.doFinal(byte[], int).

Specified by:

getOutputSize in interface AEADCipher

Parameters:

len - the length of the input.

Returns:

the space required to accommodate a call to processBytes and doFinal with len bytes of input.

reset

public void reset()

Description copied from interface: AEADCipher

Reset the cipher. After resetting the cipher is in the same state as it was after the last init (if there was one).

Specified by:

reset in interface AEADCipher