jdk.security.AlgorithmParameterGenerator — clojure-interop/java.security 1.0.5

The AlgorithmParameterGenerator class is used to generate a set of parameters to be used with a certain algorithm. Parameter generators are constructed using the getInstance factory methods (static methods that return instances of a given class).

The object that will generate the parameters can be initialized in two different ways: in an algorithm-independent manner, or in an algorithm-specific manner:

The algorithm-independent approach uses the fact that all parameter generators share the concept of a "size" and a source of randomness. The measure of size is universally shared by all algorithm parameters, though it is interpreted differently for different algorithms. For example, in the case of parameters for the DSA algorithm, "size" corresponds to the size of the prime modulus (in bits). When using this approach, algorithm-specific parameter generation values - if any - default to some standard values, unless they can be derived from the specified size.

The other approach initializes a parameter generator object using algorithm-specific semantics, which are represented by a set of algorithm-specific parameter generation values. To generate Diffie-Hellman system parameters, for example, the parameter generation values usually consist of the size of the prime modulus and the size of the random exponent, both specified in number of bits.

In case the client does not explicitly initialize the AlgorithmParameterGenerator (via a call to an init method), each provider must supply (and document) a default initialization. For example, the Sun provider uses a default modulus prime size of 1024 bits for the generation of DSA parameters.

Every implementation of the Java platform is required to support the following standard AlgorithmParameterGenerator algorithms and keysizes in parentheses:

DiffieHellman (1024) DSA (1024)

These algorithms are described in the AlgorithmParameterGenerator 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.

*get-instance clj

(*get-instance algorithm)

(*get-instance algorithm provider)

Returns an AlgorithmParameterGenerator object for generating a set of parameters to be used with the specified algorithm.

A new AlgorithmParameterGenerator object encapsulating the AlgorithmParameterGeneratorSpi 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.

algorithm - the name of the algorithm this parameter generator is associated with. See the AlgorithmParameterGenerator section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard algorithm names. - java.lang.String provider - the string name of the Provider. - java.lang.String

returns: the new AlgorithmParameterGenerator object. - java.security.AlgorithmParameterGenerator

throws: java.security.NoSuchAlgorithmException - if an AlgorithmParameterGeneratorSpi implementation for the specified algorithm is not available from the specified provider.

generate-parameters clj

(generate-parameters this)

Generates the parameters.

returns: the new AlgorithmParameters object. - java.security.AlgorithmParameters

get-algorithm clj

(get-algorithm this)

Returns the standard name of the algorithm this parameter generator is associated with.

returns: the string name of the algorithm. - java.lang.String

get-provider clj

(get-provider this)

Returns the provider of this algorithm parameter generator object.

returns: the provider of this algorithm parameter generator object - java.security.Provider

init clj

(init this size)

(init this size random)

Initializes this parameter generator for a certain size and source of randomness.

size - the size (number of bits). - int random - the source of randomness. - java.security.SecureRandom