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Java Standard Edition (SE)

AlgorithmParametersSpi


compact1, compact2, compact3
java.security

Class 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 Detail

      • AlgorithmParametersSpi

        public AlgorithmParametersSpi()
    • Method Detail

      • 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.


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