Java 7 For Mac Update

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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)

  • 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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Latest Java 7 Update

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