Module java.base
Package java.security

Class AlgorithmParametersSpi

java.lang.Object
java.security.AlgorithmParametersSpi
public abstract class AlgorithmParametersSpi extends Object
This class defines the Service Provider Interface (SPI) for the AlgorithmParameters class, which is used to manage algorithm parameters.

All the abstract methods in this class must be implemented by each cryptographic service provider who wishes to supply parameter management for a particular algorithm.

Since:
1.2
See Also:
AlgorithmParameters, AlgorithmParameterSpec, DSAParameterSpec

  • Constructor Details

    • AlgorithmParametersSpi

      public AlgorithmParametersSpi()
      Constructor for subclasses to call.

  • Method Details

    • engineInit

      protected abstract void engineInit​(AlgorithmParameterSpec paramSpec) throws InvalidParameterSpecException
      Initializes this parameters object using the parameters specified in paramSpec.
      Parameters:
      paramSpec - the parameter specification.
      Throws:
      InvalidParameterSpecException - if the given parameter specification is inappropriate for the initialization of this parameter object.

    • engineInit

      protected abstract void engineInit​(byte[] params) throws IOException
      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 - the encoded parameters.
      Throws:
      IOException - on decoding errors

    • engineInit

      protected abstract void engineInit​(byte[] params, String format) throws IOException
      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 - the encoded parameters.
      format - the name of the decoding format.
      Throws:
      IOException - on decoding errors

    • engineGetParameterSpec

      protected abstract <T extends AlgorithmParameterSpec> T engineGetParameterSpec​(Class<T> paramSpec) throws InvalidParameterSpecException
      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.
      Type Parameters:
      T - the type of the parameter specification to be returned
      Parameters:
      paramSpec - the specification class in which the parameters should be returned.
      Returns:
      the parameter specification.
      Throws:
      InvalidParameterSpecException - if the requested parameter specification is inappropriate for this parameter object.

    • engineGetEncoded

      protected abstract byte[] engineGetEncoded() throws IOException
      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:
      the parameters encoded using their primary encoding format.
      Throws:
      IOException - on encoding errors.

    • engineGetEncoded

      protected abstract byte[] engineGetEncoded​(String format) throws IOException
      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:
      format - the name of the encoding format.
      Returns:
      the parameters encoded using the specified encoding scheme.
      Throws:
      IOException - on encoding errors.

    • engineToString

      protected abstract String engineToString()
      Returns a formatted string describing the parameters.
      Returns:
      a formatted string describing the parameters.