Class javax.crypto.MacSpi
java.lang.Object
|
+----javax.crypto.MacSpi
- public abstract class MacSpi
- extends java.lang.Object
This class defines the Service Provider Interface (SPI)
for the Mac
class.
All the abstract methods in this class must be implemented by each
cryptographic service provider who wishes to supply the implementation
of a particular MAC algorithm.
Implementations are free to implement the Cloneable interface.
Method Summary
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java.lang.Object
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clone()
Returns a clone if the implementation is cloneable.
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byte[]
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engineDoFinal()
Completes the MAC computation and resets the MAC for further use,
maintaining the secret key that the MAC was initialized with.
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int
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engineGetMacLength()
Returns the length of the MAC in bytes.
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void
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engineInit(java.security.Key key,
java.security.spec.AlgorithmParameterSpec params)
Initializes the MAC with the given (secret) key and algorithm
parameters.
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void
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engineReset()
Resets the MAC for further use, maintaining the secret key that the
MAC was initialized with.
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void
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engineUpdate(byte input)
Processes the given byte.
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void
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engineUpdate(byte[] input,
int offset,
int len)
Processes the first len bytes in input ,
starting at offset .
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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 |
MacSpi
public MacSpi()
engineGetMacLength
protected abstract int engineGetMacLength()
- Returns the length of the MAC in bytes.
- Returns:
- the MAC length in bytes.
engineInit
protected abstract void engineInit(java.security.Key key,
java.security.spec.AlgorithmParameterSpec params) throws java.security.InvalidKeyException, java.security.InvalidAlgorithmParameterException
- Initializes the MAC with the given (secret) key and algorithm
parameters.
- Parameters:
key
- the (secret) key.
params
- the algorithm parameters.
- Throws:
- java.security.InvalidKeyException - if the given key is inappropriate for
initializing this MAC.
- java.security.InvalidAlgorithmParameterException - if the given algorithm
parameters are inappropriate for this MAC.
engineUpdate
protected abstract void engineUpdate(byte input)
- Processes the given byte.
- Parameters:
input
- the input byte to be processed.
engineUpdate
protected abstract void engineUpdate(byte[] input,
int offset,
int len)
- Processes the first
len
bytes in input
,
starting at offset
.
- Parameters:
input
- the input buffer.
offset
- the offset in input
where the input starts.
len
- the number of bytes to process.
engineDoFinal
protected abstract byte[] engineDoFinal()
- Completes the MAC computation and resets the MAC for further use,
maintaining the secret key that the MAC was initialized with.
- Returns:
- the MAC result.
engineReset
protected abstract void engineReset()
- Resets the MAC for further use, maintaining the secret key that the
MAC was initialized with.
clone
public java.lang.Object clone() throws java.lang.CloneNotSupportedException
- Returns a clone if the implementation is cloneable.
- Returns:
- a clone if the implementation is cloneable.
- Throws:
- java.lang.CloneNotSupportedException - if this is called
on an implementation that does not support
Cloneable
. - Overrides:
- clone in class java.lang.Object