javax.crypto
public abstract class MacSpi extends Object
Providers wishing to implement a Mac must subclass this class and provide appropriate implementations of all its abstract methods, then provide an entry pointing to this implementation in the master java.security.Provider class.
Implementations may optionally implement the java.lang.Cloneable interface.
Since: 1.4
Constructor Summary | |
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MacSpi()
Create a new MacSpi instance. |
Method Summary | |
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Object | clone()
Returns a clone of this instance if cloning is supported.
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protected abstract byte[] | engineDoFinal()
Finalize the computation of this MAC and return the result as a
byte array.
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protected abstract int | engineGetMacLength()
Return the total length, in bytes, of the computed MAC (the length
of the byte array returned by MacSpi.
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protected abstract void | engineInit(Key key, AlgorithmParameterSpec params)
Initialize (or re-initialize) this instance.
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protected abstract void | engineReset()
Reset this instance. |
protected abstract void | engineUpdate(byte input)
Update this MAC with a single byte.
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protected abstract void | engineUpdate(byte[] input, int offset, int length)
Update this MAC with a portion of a byte array.
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protected void | engineUpdate(ByteBuffer buffer)
Update this MAC with the remaining bytes of a buffer.
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Returns: A clone of this instance.
Throws: java.lang.CloneNotSupportedException If this instance does not support cloneing.
Returns: The MAC.
Returns: The MAC length.
Parameters: key The key to use. params The parameters to use.
Throws: java.security.InvalidAlgorithmParameterException If this instance rejects the specified parameters. java.security.InvalidKeyException If this instance rejects the specified key.
Parameters: input The next byte.
Parameters: input The next bytes. offset The index in input
at which to start. length The number of bytes to update.
Parameters: buffer The input buffer.
Since: 1.5