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OAEPParameterSpec

public class OAEPParameterSpec
extends Object implements AlgorithmParameterSpec

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


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

See also:

Summary

Fields

public static final OAEPParameterSpec DEFAULT

The OAEP parameter set with all default values.

Public constructors

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 methods

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 methods

From class java.lang.Object

Fields

DEFAULT

Added in API level 1
OAEPParameterSpec DEFAULT

The OAEP parameter set with all default values.

Public constructors

OAEPParameterSpec

Added in API level 1
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 String: the algorithm name for the message digest.
mgfName String: the algorithm name for the mask generation function.
mgfSpec AlgorithmParameterSpec: the parameters for the mask generation function. If null is specified, null will be returned by getMGFParameters().
pSrc PSource: the source of the encoding input P.
Throws
NullPointerException if mdName, mgfName, or pSrc is null.

Public methods

getDigestAlgorithm

Added in API level 1
String getDigestAlgorithm ()

Returns the message digest algorithm name.

Returns
String the message digest algorithm name.

getMGFAlgorithm

Added in API level 1
String getMGFAlgorithm ()

Returns the mask generation function algorithm name.

Returns
String the mask generation function algorithm name.

getMGFParameters

Added in API level 1
AlgorithmParameterSpec getMGFParameters ()

Returns the parameters for the mask generation function.

Returns
AlgorithmParameterSpec the parameters for the mask generation function.

getPSource

Added in API level 1
PSource getPSource ()

Returns the source of encoding input P.

Returns
PSource the source of encoding input P.
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