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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 of the Java Cryptography Architecture Standard Algorithm Name Documentation. Consult the release documentation for your implementation to see if any other algorithms are supported.

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 method. Parameters: algorithm - the standard name of the requested MAC algorithm. See the Mac section in the for information about standard algorithm names. Returns: the new Mac object.

Throws: - if no Provider supports a MacSpi implementation for the specified algorithm. See Also: • getInstance public static final getInstance( algorithm, provider) throws.

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.

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Note that the list of registered providers may be retrieved via the method. Parameters: algorithm - the standard name of the requested MAC algorithm. See the Mac section in the for information about standard algorithm names. Provider - the name of the provider.

Returns: the new Mac object. Throws: - if a MacSpi implementation for the specified algorithm is not available from the specified provider. - if the specified provider is not registered in the security provider list. - if the provider is null or empty. See Also: • getInstance public static final getInstance( algorithm, provider) throws. 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.