File	Doc	Category	Size	Date	Package
MacSpi.java	API Doc	Android 1.5 API	5150	Wed May 06 22:41:02 BST 2009	javax.crypto

MacSpi

• java.lang.Object

Fields Summary

Constructors Summary
public MacSpi() Creates a new {@code MacSpi} instance. since Android 1.0

Methods Summary
public java.lang.Object	clone() Clones this {@code MacSpi} instance. return the cloned instance. throws CloneNotSupportedException if cloning is not supported. since Android 1.0 return super.clone();
protected abstract byte[]	engineDoFinal() Computes the digest of this MAC based on the data previously specified in {@link #engineUpdate} calls. This {@code MacSpi} instance is reverted to its initial state and can be used to start the next MAC computation with the same parameters or initialized with different parameters. return the generated digest. since Android 1.0
protected abstract int	engineGetMacLength() Returns the length of this MAC (in bytes). return the length of this MAC (in bytes). since Android 1.0
protected abstract void	engineInit(java.security.Key key, java.security.spec.AlgorithmParameterSpec params) Initializes this {@code MacSpi} instance with the specified key and algorithm parameters. param key the key to initialize this algorithm. param params the parameters for this algorithm. throws InvalidKeyException if the specified key cannot be used to initialize this algorithm, or it is {@code null}. throws InvalidAlgorithmParameterException if the specified parameters cannot be used to initialize this algorithm. since Android 1.0
protected abstract void	engineReset() Resets this {@code MacSpi} instance to its initial state. This {@code MacSpi} instance is reverted to its initial state and can be used to start the next MAC computation with the same parameters or initialized with different parameters. since Android 1.0
protected abstract void	engineUpdate(byte input) Updates this {@code MacSpi} instance with the specified byte. param input the byte. since Android 1.0
protected abstract void	engineUpdate(byte[] input, int offset, int len) Updates this {@code MacSpi} instance with the data from the specified buffer {@code input} from the specified {@code offset} and length {@code len}. param input the buffer. param offset the offset in the buffer. param len the length of the data in the buffer. since Android 1.0
protected void	engineUpdate(java.nio.ByteBuffer input) Updates this {@code MacSpi} instance with the data from the specified buffer, starting at {@link ByteBuffer#position()}, including the next {@link ByteBuffer#remaining()} bytes. param input the buffer. since Android 1.0 if (!input.hasRemaining()) { return; } byte[] bInput; if (input.hasArray()) { bInput = input.array(); int offset = input.arrayOffset(); int position = input.position(); int limit = input.limit(); engineUpdate(bInput, offset + position, limit - position); input.position(limit); } else { bInput = new byte[input.limit() - input.position()]; input.get(bInput); engineUpdate(bInput, 0, bInput.length); }