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javax.crypto.spec
Class OAEPParameterSpec

java.lang.Object
  javax.crypto.spec.OAEPParameterSpec

All Implemented Interfaces:

AlgorithmParameterSpec

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

Since:

1.5

See Also:

MGF1ParameterSpec, PSource

Field Summary

Modifier and Type	Field and Description
static OAEPParameterSpec	DEFAULT The OAEP parameter set with all default values.

Constructor and Description

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.

Method Summary

Modifier and Type	Method and Description
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.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT

public static final OAEPParameterSpec DEFAULT

The OAEP parameter set with all default values.

Constructor Detail

OAEPParameterSpec

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.

Method Detail

getDigestAlgorithm

public String getDigestAlgorithm()

Returns the message digest algorithm name.

Returns:

the message digest algorithm name.

getMGFAlgorithm

public String getMGFAlgorithm()

Returns the mask generation function algorithm name.

Returns:

the mask generation function algorithm name.

getMGFParameters

public AlgorithmParameterSpec getMGFParameters()

Returns the parameters for the mask generation function.

Returns:

the parameters for the mask generation function.

getPSource

public PSource getPSource()

Returns the source of encoding input P.

Returns:

the source of encoding input P.