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JavaTM 2 Platform Standard Ed. 5.0 |
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java.lang.Objectjava.security.AlgorithmParameterGenerator
public class AlgorithmParameterGenerator
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:
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.
AlgorithmParameters,
AlgorithmParameterSpec| Constructor Summary | |
|---|---|
protected |
AlgorithmParameterGenerator(AlgorithmParameterGeneratorSpi paramGenSpi,
Provider provider,
String algorithm)
Creates an AlgorithmParameterGenerator object. |
| Method Summary | |
|---|---|
AlgorithmParameters |
generateParameters()
Generates the parameters. |
String |
getAlgorithm()
Returns the standard name of the algorithm this parameter generator is associated with. |
static AlgorithmParameterGenerator |
getInstance(String algorithm)
Generates an AlgorithmParameterGenerator object that implements the specified digest algorithm. |
static AlgorithmParameterGenerator |
getInstance(String algorithm,
Provider provider)
Generates an AlgorithmParameterGenerator object for the requested algorithm, as supplied from the specified provider, if such a parameter generator is available from the provider. |
static AlgorithmParameterGenerator |
getInstance(String algorithm,
String provider)
Generates an AlgorithmParameterGenerator object for the requested algorithm, as supplied from the specified provider, if such a parameter generator is available from the provider. |
Provider |
getProvider()
Returns the provider of this algorithm parameter generator object. |
void |
init(AlgorithmParameterSpec genParamSpec)
Initializes this parameter generator with a set of algorithm-specific parameter generation values. |
void |
init(AlgorithmParameterSpec genParamSpec,
SecureRandom random)
Initializes this parameter generator with a set of algorithm-specific parameter generation values. |
void |
init(int size)
Initializes this parameter generator for a certain size. |
void |
init(int size,
SecureRandom random)
Initializes this parameter generator for a certain size and source of randomness. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
protected AlgorithmParameterGenerator(AlgorithmParameterGeneratorSpi paramGenSpi,
Provider provider,
String algorithm)
paramGenSpi - the delegateprovider - the provideralgorithm - the algorithm| Method Detail |
|---|
public final String getAlgorithm()
public static AlgorithmParameterGenerator getInstance(String algorithm)
throws NoSuchAlgorithmException
algorithm - the string name of the algorithm this
parameter generator is associated with.
NoSuchAlgorithmException - if the algorithm is
not available in the environment.
public static AlgorithmParameterGenerator getInstance(String algorithm,
String provider)
throws NoSuchAlgorithmException,
NoSuchProviderException
algorithm - the string name of the algorithm.provider - the string name of the provider.
NoSuchAlgorithmException - if the algorithm is
not available from the provider.
NoSuchProviderException - if the provider is not
available in the environment.
IllegalArgumentException - if the provider name is null
or empty.Provider
public static AlgorithmParameterGenerator getInstance(String algorithm,
Provider provider)
throws NoSuchAlgorithmException
provider doesn't have to be registered.
algorithm - the string name of the algorithm.provider - the provider.
NoSuchAlgorithmException - if the algorithm is
not available from the provider.
IllegalArgumentException - if the provider is
null.Providerpublic final Provider getProvider()
public final void init(int size)
SecureRandom
implementation of the highest-priority installed provider is used as
the source of randomness.
(If none of the installed providers supply an implementation of
SecureRandom, a system-provided source of randomness is
used.)
size - the size (number of bits).
public final void init(int size,
SecureRandom random)
size - the size (number of bits).random - the source of randomness.
public final void init(AlgorithmParameterSpec genParamSpec)
throws InvalidAlgorithmParameterException
SecureRandom
implementation of the highest-priority installed provider is used as
the source of randomness.
(If none of the installed providers supply an implementation of
SecureRandom, a system-provided source of randomness is
used.)
genParamSpec - the set of algorithm-specific parameter generation values.
InvalidAlgorithmParameterException - if the given parameter
generation values are inappropriate for this parameter generator.
public final void init(AlgorithmParameterSpec genParamSpec,
SecureRandom random)
throws InvalidAlgorithmParameterException
genParamSpec - the set of algorithm-specific parameter generation values.random - the source of randomness.
InvalidAlgorithmParameterException - if the given parameter
generation values are inappropriate for this parameter generator.public final AlgorithmParameters generateParameters()
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JavaTM 2 Platform Standard Ed. 5.0 |
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Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.