- java.lang.Object
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- javax.crypto.MacSpi
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public abstract class MacSpi extends Object
This class defines the Service Provider Interface (SPI) for theMac
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.
- Since:
- 1.4
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Constructor Summary
Constructors Constructor and Description MacSpi()
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Method Summary
Methods Modifier and Type Method and Description Object
clone()
Returns a clone if the implementation is cloneable.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.protected abstract int
engineGetMacLength()
Returns the length of the MAC in bytes.protected abstract void
engineInit(Key key, AlgorithmParameterSpec params)
Initializes the MAC with the given (secret) key and algorithm parameters.protected abstract void
engineReset()
Resets the MAC for further use, maintaining the secret key that the MAC was initialized with.protected abstract void
engineUpdate(byte input)
Processes the given byte.protected abstract void
engineUpdate(byte[] input, int offset, int len)
Processes the firstlen
bytes ininput
, starting atoffset
inclusive.protected void
engineUpdate(ByteBuffer input)
Processesinput.remaining()
bytes in the ByteBufferinput
, starting atinput.position()
.
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Method Detail
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engineGetMacLength
protected abstract int engineGetMacLength()
Returns the length of the MAC in bytes.- Returns:
- the MAC length in bytes.
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engineInit
protected abstract void engineInit(Key key, AlgorithmParameterSpec params) throws InvalidKeyException, InvalidAlgorithmParameterException
Initializes the MAC with the given (secret) key and algorithm parameters.- Parameters:
key
- the (secret) key.params
- the algorithm parameters.- Throws:
InvalidKeyException
- if the given key is inappropriate for initializing this MAC.InvalidAlgorithmParameterException
- if the given algorithm parameters are inappropriate for this MAC.
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engineUpdate
protected abstract void engineUpdate(byte input)
Processes the given byte.- Parameters:
input
- the input byte to be processed.
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engineUpdate
protected abstract void engineUpdate(byte[] input, int offset, int len)
Processes the firstlen
bytes ininput
, starting atoffset
inclusive.- Parameters:
input
- the input buffer.offset
- the offset ininput
where the input starts.len
- the number of bytes to process.
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engineUpdate
protected void engineUpdate(ByteBuffer input)
Processesinput.remaining()
bytes in the ByteBufferinput
, starting atinput.position()
. Upon return, the buffer's position will be equal to its limit; its limit will not have changed.Subclasses should consider overriding this method if they can process ByteBuffers more efficiently than byte arrays.
- Parameters:
input
- the ByteBuffer- Since:
- 1.5
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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.
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engineReset
protected abstract void engineReset()
Resets the MAC for further use, maintaining the secret key that the MAC was initialized with.
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clone
public Object clone() throws CloneNotSupportedException
Returns a clone if the implementation is cloneable.- Overrides:
clone
in classObject
- Returns:
- a clone if the implementation is cloneable.
- Throws:
CloneNotSupportedException
- if this is called on an implementation that does not supportCloneable
.- See Also:
Cloneable
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Source du document imprimé : https://www.gaudry.be/java-api-rf-javax/crypto/MacSpi.html
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