public class KCCMBlockCipher extends java.lang.Object implements AEADBlockCipher
| Constructor and Description |
|---|
KCCMBlockCipher(BlockCipher engine)
Base constructor.
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KCCMBlockCipher(BlockCipher engine,
int nB)
Constructor allowing Nb configuration.
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| 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 cipher 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.
|
int |
processPacket(byte[] in,
int inOff,
int len,
byte[] out,
int outOff) |
void |
reset()
Reset the cipher.
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public KCCMBlockCipher(BlockCipher engine)
engine - base cipher to use under CCM.public KCCMBlockCipher(BlockCipher engine, int nB)
Nb is a parameter specified in CCM mode of DSTU7624 standard. This parameter specifies maximum possible length of input. It should be calculated as follows: Nb = 1/8 * (-3 + log[2]Nmax) + 1, where Nmax - length of input message in bits. For practical reasons Nmax usually less than 4Gb, e.g. for Nmax = 2^32 - 1, Nb = 4.
engine - base cipher to use under CCM.nB - Nb value to use.public void init(boolean forEncryption,
CipherParameters params)
throws java.lang.IllegalArgumentException
AEADBlockCipherinit in interface AEADBlockCipherforEncryption - true if we are setting up for encryption, false otherwise.params - the necessary parameters for the underlying cipher to be initialised.java.lang.IllegalArgumentException - if the params argument is inappropriate.public java.lang.String getAlgorithmName()
AEADBlockCiphergetAlgorithmName in interface AEADBlockCipherpublic BlockCipher getUnderlyingCipher()
AEADBlockCiphergetUnderlyingCipher in interface AEADBlockCipherpublic void processAADByte(byte in)
AEADBlockCipherprocessAADByte in interface AEADBlockCipherin - the byte to be processed.public void processAADBytes(byte[] in,
int inOff,
int len)
AEADBlockCipherprocessAADBytes in interface AEADBlockCipherin - 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.public int processByte(byte in,
byte[] out,
int outOff)
throws DataLengthException,
java.lang.IllegalStateException
AEADBlockCipherprocessByte in interface AEADBlockCipherin - 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.DataLengthException - if the output buffer is too small.java.lang.IllegalStateExceptionpublic int processBytes(byte[] in,
int inOff,
int inLen,
byte[] out,
int outOff)
throws DataLengthException,
java.lang.IllegalStateException
AEADBlockCipherprocessBytes in interface AEADBlockCipherin - 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.DataLengthException - if the output buffer is too small.java.lang.IllegalStateExceptionpublic int processPacket(byte[] in,
int inOff,
int len,
byte[] out,
int outOff)
throws java.lang.IllegalStateException,
InvalidCipherTextException
java.lang.IllegalStateExceptionInvalidCipherTextExceptionpublic int doFinal(byte[] out,
int outOff)
throws java.lang.IllegalStateException,
InvalidCipherTextException
AEADBlockCipherdoFinal in interface AEADBlockCipherout - space for any resulting output data.outOff - offset into out to start copying the data at.java.lang.IllegalStateException - if the cipher is in an inappropriate state.InvalidCipherTextException - if the MAC fails to match.public byte[] getMac()
AEADBlockCiphergetMac in interface AEADBlockCipherpublic int getUpdateOutputSize(int len)
AEADBlockCipherThe 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.
getUpdateOutputSize in interface AEADBlockCipherlen - the length of the input.public int getOutputSize(int len)
AEADBlockCipher
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 AEADBlockCipher.doFinal(byte[], int).
getOutputSize in interface AEADBlockCipherlen - the length of the input.public void reset()
AEADBlockCipherreset in interface AEADBlockCipher