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java.lang.Object org.bouncycastle.crypto.macs.GOST28147Mac
public class GOST28147Mac
implementation of GOST 28147-89 MAC
Field Summary | |
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private int |
blockSize
|
private byte[] |
buf
|
private int |
bufOff
|
private boolean |
firstStep
|
private byte[] |
mac
|
private int |
macSize
|
private byte[] |
S
|
private int[] |
workingKey
|
Constructor Summary | |
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GOST28147Mac()
|
Method Summary | |
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private int |
bytesToint(byte[] in,
int inOff)
|
private byte[] |
CM5func(byte[] buf,
int bufOff,
byte[] mac)
|
int |
doFinal(byte[] out,
int outOff)
Compute the final statge of the MAC writing the output to the out parameter. |
private int[] |
generateWorkingKey(byte[] userKey)
|
java.lang.String |
getAlgorithmName()
Return the name of the algorithm the MAC implements. |
int |
getMacSize()
Return the block size for this MAC (in bytes). |
private int |
gost28147_mainStep(int n1,
int key)
|
private void |
gost28147MacFunc(int[] workingKey,
byte[] in,
int inOff,
byte[] out,
int outOff)
|
void |
init(CipherParameters params)
Initialise the MAC. |
private void |
intTobytes(int num,
byte[] out,
int outOff)
|
void |
reset()
Reset the MAC. |
void |
update(byte in)
add a single byte to the mac for processing. |
void |
update(byte[] in,
int inOff,
int len)
|
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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private int blockSize
private int macSize
private int bufOff
private byte[] buf
private byte[] mac
private boolean firstStep
private int[] workingKey
private byte[] S
Constructor Detail |
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public GOST28147Mac()
Method Detail |
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private int[] generateWorkingKey(byte[] userKey)
public void init(CipherParameters params) throws java.lang.IllegalArgumentException
Mac
init
in interface Mac
params
- the key and other data required by the MAC.
java.lang.IllegalArgumentException
- if the params argument is
inappropriate.public java.lang.String getAlgorithmName()
Mac
getAlgorithmName
in interface Mac
public int getMacSize()
Mac
getMacSize
in interface Mac
private int gost28147_mainStep(int n1, int key)
private void gost28147MacFunc(int[] workingKey, byte[] in, int inOff, byte[] out, int outOff)
private int bytesToint(byte[] in, int inOff)
private void intTobytes(int num, byte[] out, int outOff)
private byte[] CM5func(byte[] buf, int bufOff, byte[] mac)
public void update(byte in) throws java.lang.IllegalStateException
Mac
update
in interface Mac
in
- the byte to be processed.
java.lang.IllegalStateException
- if the MAC is not initialised.public void update(byte[] in, int inOff, int len) throws DataLengthException, java.lang.IllegalStateException
update
in interface Mac
in
- the array containing the input.inOff
- the index in the array the data begins at.len
- the length of the input starting at inOff.
DataLengthException
- if there isn't enough data in in.
java.lang.IllegalStateException
- if the MAC is not initialised.public int doFinal(byte[] out, int outOff) throws DataLengthException, java.lang.IllegalStateException
Mac
doFinal leaves the MAC in the same state it was after the last init.
doFinal
in interface Mac
out
- the array the MAC is to be output to.outOff
- the offset into the out buffer the output is to start at.
DataLengthException
- if there isn't enough space in out.
java.lang.IllegalStateException
- if the MAC is not initialised.public void reset()
Mac
reset
in interface Mac
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