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Bouncy Castle Cryptography 1.50 | ||||||||
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java.lang.Objectorg.bouncycastle.crypto.macs.SkeinMac
public class SkeinMac
Implementation of the Skein parameterised MAC function in 256, 512 and 1024 bit block sizes,
based on the Threefish
tweakable block cipher.
SkeinEngine
,
SkeinParameters
Field Summary | |
---|---|
static int |
SKEIN_1024
1024 bit block size - Skein MAC-1024 |
static int |
SKEIN_256
256 bit block size - Skein MAC-256 |
static int |
SKEIN_512
512 bit block size - Skein MAC-512 |
Constructor Summary | |
---|---|
SkeinMac(int stateSizeBits,
int digestSizeBits)
Constructs a Skein MAC with an internal state size and output size. |
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SkeinMac(SkeinMac mac)
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Method Summary | |
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int |
doFinal(byte[] out,
int outOff)
Compute the final stage of the MAC writing the output to the out parameter. |
java.lang.String |
getAlgorithmName()
Return the name of the algorithm the MAC implements. |
int |
getMacSize()
Return the block size for this MAC (in bytes). |
void |
init(CipherParameters params)
Initialises the Skein digest with the provided parameters. See SkeinParameters for details on the parameterisation of the Skein hash function. |
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)
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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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public static final int SKEIN_256
public static final int SKEIN_512
public static final int SKEIN_1024
Constructor Detail |
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public SkeinMac(int stateSizeBits, int digestSizeBits)
stateSizeBits
- the internal state size in bits - one of SKEIN_256
, SKEIN_512
or
SKEIN_1024
.digestSizeBits
- the output/MAC size to produce in bits, which must be an integral number of bytes.public SkeinMac(SkeinMac mac)
Method Detail |
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public java.lang.String getAlgorithmName()
Mac
getAlgorithmName
in interface Mac
public void init(CipherParameters params) throws java.lang.IllegalArgumentException
SkeinParameters
for details on the parameterisation of the Skein hash function.
init
in interface Mac
params
- an instance of SkeinParameters
or KeyParameter
.
java.lang.IllegalArgumentException
- if the params argument is
inappropriate.public int getMacSize()
Mac
getMacSize
in interface Mac
public void reset()
Mac
reset
in interface Mac
public void update(byte in)
Mac
update
in interface Mac
in
- the byte to be processed.public void update(byte[] in, int inOff, int len)
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.public int doFinal(byte[] out, int outOff)
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.
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