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Class

Class Mac

- javax.crypto.Mac

All Implemented Interfaces:
Cloneable
This class provides the functionality of a 'Message Authentication Code' (MAC) algorithm.
A MAC provides a way to check the integrity of information transmitted over or stored in an unreliable medium, based on a secret key. Typically, message authentication codes are used between two parties that share a secret key in order to validate information transmitted between these parties.
A MAC mechanism that is based on cryptographic hash functions is referred to as HMAC. HMAC can be used with any cryptographic hash function, e.g., SHA256 or SHA384, in combination with a secret shared key. HMAC is specified in RFC 2104.
Every implementation of the Java platform is required to support the following standard Mac algorithms:
- HmacMD5
- HmacSHA1
- HmacSHA256
These algorithms are described in the Mac section of the Java Cryptography Architecture Standard Algorithm Name Documentation. Consult the release documentation for your implementation to see if any other algorithms are supported.
Since:
1.4

Constructor Summary
Constructors
Modifier Constructor and Description
protected Mac(MacSpi macSpi, Provider provider, String algorithm)

Constructors
Modifier	Constructor and Description
`protected`	`Mac(MacSpi macSpi, Provider provider, String algorithm)`

Method Summary

Methods
Modifier and Type	Method and Description
`Object`	`clone()` Returns a clone if the provider implementation is cloneable.
`byte[]`	`doFinal()`
`byte[]`	`doFinal(byte[] input)` Processes the given array of bytes and finishes the MAC operation.
`void`	`doFinal(byte[] output, int outOffset)`
`String`	`getAlgorithm()` Returns the algorithm name of this `Mac` object.
`static Mac`	`getInstance(String algorithm)` Returns a `Mac` object that implements the specified MAC algorithm.
`static Mac`	`getInstance(String algorithm, Provider provider)` Returns a `Mac` object that implements the specified MAC algorithm.
`static Mac`	`getInstance(String algorithm, String provider)` Returns a `Mac` object that implements the specified MAC algorithm.
`int`	`getMacLength()`
`Provider`	`getProvider()` Returns the provider of this `Mac` object.
`void`	`init(Key key)`
`void`	`init(Key key, AlgorithmParameterSpec params)` Initializes this `Mac` object with the given key and algorithm parameters.
`void`	`reset()`
`void`	`update(byte input)` Processes the given byte.
`void`	`update(byte[] input)`
`void`	`update(byte[] input, int offset, int len)` Processes the first `len` bytes in `input`, starting at `offset` inclusive.
`void`	`update(ByteBuffer input)` Processes `input.remaining()` bytes in the ByteBuffer `input`, starting at `input.position()`.

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Mac
    Parameters:
    macSpi - the delegate
    provider - the provider
    algorithm - the algorithm
- Method Detail
  - getAlgorithm
    Returns the algorithm name of this Mac object.
    This is the same name that was specified in one of the getInstance calls that created this Mac object.
    Returns:
    the algorithm name of this Mac object.
  - getInstance
    Returns a Mac object that implements the specified MAC algorithm.
    This method traverses the list of registered security Providers, starting with the most preferred Provider. A new Mac object encapsulating the MacSpi implementation from the first Provider that supports the specified algorithm is returned.
    Note that the list of registered providers may be retrieved via the Security.getProviders() method.
    Parameters:
    algorithm - the standard name of the requested MAC algorithm. See the Mac section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard algorithm names.
    Returns:
    the new Mac object.
    Throws:
    NoSuchAlgorithmException - if no Provider supports a MacSpi implementation for the specified algorithm.
    See Also:
    Provider
  - getInstance
    Returns a Mac object that implements the specified MAC algorithm.
    A new Mac object encapsulating the MacSpi implementation from the specified provider is returned. The specified provider must be registered in the security provider list.
    Note that the list of registered providers may be retrieved via the Security.getProviders() method.
    Parameters:
    algorithm - the standard name of the requested MAC algorithm. See the Mac section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard algorithm names.
    provider - the name of the provider.
    Returns:
    the new Mac object.
    Throws:
    NoSuchAlgorithmException - if a MacSpi implementation for the specified algorithm is not available from the specified provider.
    NoSuchProviderException - if the specified provider is not registered in the security provider list.
    IllegalArgumentException - if the provider is null or empty.
    See Also:
    Provider
  - getInstance
    Returns a Mac object that implements the specified MAC algorithm.
    A new Mac object encapsulating the MacSpi implementation from the specified Provider object is returned. Note that the specified Provider object does not have to be registered in the provider list.
    Parameters:
    algorithm - the standard name of the requested MAC algorithm. See the Mac section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard algorithm names.
    provider - the provider.
    Returns:
    the new Mac object.
    Throws:
    NoSuchAlgorithmException - if a MacSpi implementation for the specified algorithm is not available from the specified Provider object.
    IllegalArgumentException - if the provider is null.
    See Also:
    Provider
  - getProvider
    Returns:
    the provider of this Mac object.
  - getMacLength
    Returns the length of the MAC in bytes.
    Returns:
    the MAC length in bytes.
  - init
    Parameters:
    key - the key.
    Throws:
    InvalidKeyException - if the given key is inappropriate for initializing this MAC.
  - init
    Initializes this Mac object with the given key and algorithm parameters.
    Parameters:
    key - the 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.
  - update
    Parameters:
    input - the input byte to be processed.
    Throws:
    IllegalStateException - if this Mac has not been initialized.
  - update
    Processes the given array of bytes.
    Parameters:
    input - the array of bytes to be processed.
    Throws:
    IllegalStateException - if this Mac has not been initialized.
  - update
    Processes the first len bytes in input, starting at offset inclusive.
    Parameters:
    input - the input buffer.
    offset - the offset in input where the input starts.
    len - the number of bytes to process.
    Throws:
    IllegalStateException - if this Mac has not been initialized.
  - update
    Processes input.remaining() bytes in the ByteBuffer input, starting at input.position(). Upon return, the buffer's position will be equal to its limit; its limit will not have changed.
    Parameters:
    input - the ByteBuffer
    Throws:
    IllegalStateException - if this Mac has not been initialized.
    Since:
    1.5
  - doFinal
    Finishes the MAC operation.
    A call to this method resets this Mac object to the state it was in when previously initialized via a call to init(Key) or init(Key, AlgorithmParameterSpec). That is, the object is reset and available to generate another MAC from the same key, if desired, via new calls to update and doFinal. (In order to reuse this Mac object with a different key, it must be reinitialized via a call to init(Key) or init(Key, AlgorithmParameterSpec).
    Returns:
    the MAC result.
    Throws:
    IllegalStateException - if this Mac has not been initialized.
  - doFinal
    Finishes the MAC operation.
    A call to this method resets this Mac object to the state it was in when previously initialized via a call to init(Key) or init(Key, AlgorithmParameterSpec). That is, the object is reset and available to generate another MAC from the same key, if desired, via new calls to update and doFinal. (In order to reuse this Mac object with a different key, it must be reinitialized via a call to init(Key) or init(Key, AlgorithmParameterSpec).
    The MAC result is stored in output, starting at outOffset inclusive.
    Parameters:
    output - the buffer where the MAC result is stored
    outOffset - the offset in output where the MAC is stored
    Throws:
    ShortBufferException - if the given output buffer is too small to hold the result
    IllegalStateException - if this Mac has not been initialized.
  - doFinal
    Processes the given array of bytes and finishes the MAC operation.
    A call to this method resets this Mac object to the state it was in when previously initialized via a call to init(Key) or init(Key, AlgorithmParameterSpec). That is, the object is reset and available to generate another MAC from the same key, if desired, via new calls to update and doFinal. (In order to reuse this Mac object with a different key, it must be reinitialized via a call to init(Key) or init(Key, AlgorithmParameterSpec).
    Parameters:
    input - data in bytes
    Returns:
    the MAC result.
    Throws:
    IllegalStateException - if this Mac has not been initialized.
  - reset
    Resets this Mac object.
    A call to this method resets this Mac object to the state it was in when previously initialized via a call to init(Key) or init(Key, AlgorithmParameterSpec). That is, the object is reset and available to generate another MAC from the same key, if desired, via new calls to update and doFinal. (In order to reuse this Mac object with a different key, it must be reinitialized via a call to init(Key) or init(Key, AlgorithmParameterSpec).
  - clone
    Returns a clone if the provider implementation is cloneable.
    Overrides:
    clone in class Object
    Returns:
    a clone if the provider implementation is cloneable.
    Throws:
    CloneNotSupportedException - if this is called on a delegate that does not support Cloneable.
    See Also:
    Cloneable

Class

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