OAEPParameterSpec

public class OAEPParameterSpec extends Object
implements AlgorithmParameterSpec

This class specifies the set of parameters used with OAEP Padding, as defined in the PKCS #1 standard. Its ASN.1 definition in PKCS#1 standard is described below:

 RSAES-OAEP-params ::= SEQUENCE {
   hashAlgorithm      [0] OAEP-PSSDigestAlgorithms     DEFAULT sha1,
   maskGenAlgorithm   [1] PKCS1MGFAlgorithms  DEFAULT mgf1SHA1,
   pSourceAlgorithm   [2] PKCS1PSourceAlgorithms  DEFAULT pSpecifiedEmpty
 }
 
where
 OAEP-PSSDigestAlgorithms    ALGORITHM-IDENTIFIER ::= {
   { OID id-sha1 PARAMETERS NULL   }|
   { OID id-sha256 PARAMETERS NULL }|
   { OID id-sha384 PARAMETERS NULL }|
   { OID id-sha512 PARAMETERS NULL },
   ...  -- Allows for future expansion --
 }
 PKCS1MGFAlgorithms    ALGORITHM-IDENTIFIER ::= {
   { OID id-mgf1 PARAMETERS OAEP-PSSDigestAlgorithms },
   ...  -- Allows for future expansion --
 }
 PKCS1PSourceAlgorithms    ALGORITHM-IDENTIFIER ::= {
   { OID id-pSpecified PARAMETERS OCTET STRING },
   ...  -- Allows for future expansion --
 }
 

Note: the OAEPParameterSpec.DEFAULT uses the following: message digest -- "SHA-1" mask generation function (mgf) -- "MGF1" parameters for mgf -- MGF1ParameterSpec.SHA1 source of encoding input -- PSource.PSpecified.DEFAULT

Field Summary

public static final OAEPParameterSpec DEFAULT The OAEP parameter set with all default values.

Public Constructor Summary

OAEPParameterSpec(String mdName, String mgfName, AlgorithmParameterSpec mgfSpec, PSource pSrc)
Constructs a parameter set for OAEP padding as defined in the PKCS #1 standard using the specified message digest algorithm mdName, mask generation function algorithm mgfName, parameters for the mask generation function mgfSpec, and source of the encoding input P pSrc.

Public Method Summary

String
getDigestAlgorithm()
Returns the message digest algorithm name.
String
getMGFAlgorithm()
Returns the mask generation function algorithm name.
AlgorithmParameterSpec
getMGFParameters()
Returns the parameters for the mask generation function.
PSource
getPSource()
Returns the source of encoding input P.

Inherited Method Summary

Fields

public static final OAEPParameterSpec DEFAULT

The OAEP parameter set with all default values.

Public Constructors

public OAEPParameterSpec (String mdName, String mgfName, AlgorithmParameterSpec mgfSpec, PSource pSrc)

Constructs a parameter set for OAEP padding as defined in the PKCS #1 standard using the specified message digest algorithm mdName, mask generation function algorithm mgfName, parameters for the mask generation function mgfSpec, and source of the encoding input P pSrc.

Parameters
mdName the algorithm name for the message digest.
mgfName the algorithm name for the mask generation function.
mgfSpec the parameters for the mask generation function. If null is specified, null will be returned by getMGFParameters().
pSrc the source of the encoding input P.
Throws
NullPointerException if mdName, mgfName, or pSrc is null.

Public Methods

public String getDigestAlgorithm ()

Returns the message digest algorithm name.

Returns
  • the message digest algorithm name.

public String getMGFAlgorithm ()

Returns the mask generation function algorithm name.

Returns
  • the mask generation function algorithm name.

public AlgorithmParameterSpec getMGFParameters ()

Returns the parameters for the mask generation function.

Returns
  • the parameters for the mask generation function.

public PSource getPSource ()

Returns the source of encoding input P.

Returns
  • the source of encoding input P.