Top Description Fields Constructors Methods
sun.security.provider

public Class DSAParameters

extends AlgorithmParametersSpi
Class Inheritance
Imports
java.io.*, java.math.BigInteger, java.security.AlgorithmParametersSpi, java.security.spec.AlgorithmParameterSpec, .DSAParameterSpec, .InvalidParameterSpecException, sun.security.util.Debug, .DerValue, .DerOutputStream
This class implements the parameter set used by the Digital Signature Algorithm as specified in the FIPS 186 standard.
Author
Jan Luehe
Since
1.2

Field Summary

Modifier and TypeField and Description
protected BigInteger
g

protected BigInteger
p

protected BigInteger
q

Constructor Summary

AccessConstructor and Description
public
DSAParameters()

Method Summary

Modifier and TypeMethod and Description
protected byte[]
engineGetEncoded()

Implements abstract java.security.AlgorithmParametersSpi.engineGetEncoded.

Returns the parameters in their primary encoding format.
protected byte[]
engineGetEncoded(String
the name of the encoding format.
encodingMethod)

Implements abstract java.security.AlgorithmParametersSpi.engineGetEncoded.

Returns the parameters encoded in the specified format.
protected <T extends AlgorithmParameterSpec> T
engineGetParameterSpec(Class<T>
the specification class in which the parameters should be returned.
paramSpec)

Implements abstract java.security.AlgorithmParametersSpi.engineGetParameterSpec.

Returns a (transparent) specification of this parameters object.
protected void
engineInit(AlgorithmParameterSpec
the parameter specification.
paramSpec)

Implements abstract java.security.AlgorithmParametersSpi.engineInit.

Initializes this parameters object using the parameters specified in paramSpec.
protected void
engineInit(byte[]
the encoded parameters.
params)

Implements abstract java.security.AlgorithmParametersSpi.engineInit.

Imports the specified parameters and decodes them according to the primary decoding format for parameters.
protected void
engineInit(byte[]
the encoded parameters.
params, String
the name of the decoding format.
decodingMethod)

Implements abstract java.security.AlgorithmParametersSpi.engineInit.

Imports the parameters from params and decodes them according to the specified decoding format.
protected String
engineToString()

Implements abstract java.security.AlgorithmParametersSpi.engineToString.

Returns a formatted string describing the parameters.

Field Detail

gback to summary
protected BigInteger g
pback to summary
protected BigInteger p
qback to summary
protected BigInteger q

Constructor Detail

DSAParametersback to summary
public DSAParameters()

Method Detail

engineGetEncodedback to summary
protected byte[] engineGetEncoded() throws IOException

Implements abstract java.security.AlgorithmParametersSpi.engineGetEncoded.

Doc from java.security.AlgorithmParametersSpi.engineGetEncoded.

Returns the parameters in their primary encoding format. The primary encoding format for parameters is ASN.1, if an ASN.1 specification for this type of parameters exists.

Returns:byte[]

the parameters encoded using their primary encoding format.

Exceptions
IOException:
on encoding errors.
engineGetEncodedback to summary
protected byte[] engineGetEncoded(String encodingMethod) throws IOException

Implements abstract java.security.AlgorithmParametersSpi.engineGetEncoded.

Doc from java.security.AlgorithmParametersSpi.engineGetEncoded.

Returns the parameters encoded in the specified format. If format is null, the primary encoding format for parameters is used. The primary encoding format is ASN.1, if an ASN.1 specification for these parameters exists.

Parameters
encodingMethod:String

the name of the encoding format.

Returns:byte[]

the parameters encoded using the specified encoding scheme.

Exceptions
IOException:
on encoding errors.
engineGetParameterSpecback to summary
protected <T extends AlgorithmParameterSpec> T engineGetParameterSpec(Class<T> paramSpec) throws InvalidParameterSpecException

Implements abstract java.security.AlgorithmParametersSpi.engineGetParameterSpec.

Doc from java.security.AlgorithmParametersSpi.engineGetParameterSpec.

Returns a (transparent) specification of this parameters object. paramSpec identifies the specification class in which the parameters should be returned. It could, for example, be DSAParameterSpec.class, to indicate that the parameters should be returned in an instance of the DSAParameterSpec class.

Parameters
<T>
the type of the parameter specification to be returned
paramSpec:Class<T>

the specification class in which the parameters should be returned.

Returns:T

the parameter specification.

Exceptions
InvalidParameterSpecException:
if the requested parameter specification is inappropriate for this parameter object.
engineInitback to summary
protected void engineInit(AlgorithmParameterSpec paramSpec) throws InvalidParameterSpecException

Implements abstract java.security.AlgorithmParametersSpi.engineInit.

Doc from java.security.AlgorithmParametersSpi.engineInit.

Initializes this parameters object using the parameters specified in paramSpec.

Parameters
paramSpec:AlgorithmParameterSpec

the parameter specification.

Exceptions
InvalidParameterSpecException:
if the given parameter specification is inappropriate for the initialization of this parameter object.
engineInitback to summary
protected void engineInit(byte[] params) throws IOException

Implements abstract java.security.AlgorithmParametersSpi.engineInit.

Doc from java.security.AlgorithmParametersSpi.engineInit.

Imports the specified parameters and decodes them according to the primary decoding format for parameters. The primary decoding format for parameters is ASN.1, if an ASN.1 specification for this type of parameters exists.

Parameters
params:byte[]

the encoded parameters.

Exceptions
IOException:
on decoding errors
engineInitback to summary
protected void engineInit(byte[] params, String decodingMethod) throws IOException

Implements abstract java.security.AlgorithmParametersSpi.engineInit.

Doc from java.security.AlgorithmParametersSpi.engineInit.

Imports the parameters from params and decodes them according to the specified decoding format. If format is null, the primary decoding format for parameters is used. The primary decoding format is ASN.1, if an ASN.1 specification for these parameters exists.

Parameters
params:byte[]

the encoded parameters.

decodingMethod:String

the name of the decoding format.

Exceptions
IOException:
on decoding errors
engineToStringback to summary
protected String engineToString()

Implements abstract java.security.AlgorithmParametersSpi.engineToString.

Doc from java.security.AlgorithmParametersSpi.engineToString.

Returns a formatted string describing the parameters.

Returns:String

a formatted string describing the parameters.