javax.crypto.spec

Class OAEPParameterSpec

java.lang.Object

javax.crypto.spec.OAEPParameterSpec

All Implemented Interfaces:

AlgorithmParameterSpec

public class OAEPParameterSpec
extends java.lang.Object
implements AlgorithmParameterSpec

This class specifies the set of parameters used with OAEP Padding, as defined in the PKCS#1 v2.2 standard. Its ASN.1 definition in PKCS#1 standard is described below:

 RSAES-OAEP-params ::= SEQUENCE {
   hashAlgorithm      [0] HashAlgorithm     DEFAULT sha1,
   maskGenAlgorithm   [1] MaskGenAlgorithm  DEFAULT mgf1SHA1,
   pSourceAlgorithm   [2] PSourceAlgorithm  DEFAULT pSpecifiedEmpty
 }
 

where

 HashAlgorithm ::= AlgorithmIdentifier {
   {OAEP-PSSDigestAlgorithms}
 }
 MaskGenAlgorithm ::= AlgorithmIdentifier { {PKCS1MGFAlgorithms} }
 PSourceAlgorithm ::= AlgorithmIdentifier {
   {PKCS1PSourceAlgorithms}
 }

 OAEP-PSSDigestAlgorithms    ALGORITHM-IDENTIFIER ::= {
   { OID id-sha1       PARAMETERS NULL }|
   { OID id-sha224     PARAMETERS NULL }|
   { OID id-sha256     PARAMETERS NULL }|
   { OID id-sha384     PARAMETERS NULL }|
   { OID id-sha512     PARAMETERS NULL }|
   { OID id-sha512-224 PARAMETERS NULL }|
   { OID id-sha512-256 PARAMETERS NULL },
   ...  -- Allows for future expansion --
 }
 PKCS1MGFAlgorithms    ALGORITHM-IDENTIFIER ::= {
   { OID id-mgf1 PARAMETERS HashAlgorithm },
   ...  -- Allows for future expansion --
 }
 PKCS1PSourceAlgorithms    ALGORITHM-IDENTIFIER ::= {
   { OID id-pSpecified PARAMETERS EncodingParameters },
   ...  -- Allows for future expansion --
 }
 EncodingParameters ::= OCTET STRING(SIZE(0..MAX))
 

Since:

1.5

See Also:

MGF1ParameterSpec, PSource

Field Summary

Fields

Modifier and Type

Field and Description

static OAEPParameterSpec

DEFAULT Deprecated. This field uses the default values defined in the PKCS #1 standard. Some of these defaults are no longer recommended due to advances in cryptanalysis -- see Appendix B.1 of PKCS #1 for more details. Thus, it is recommended to create a new OAEPParameterSpec with the desired parameter values using the OAEPParameterSpec(String, String, AlgorithmParameterSpec, PSource) constructor.

Constructor Summary

Constructors

Constructor and Description
OAEPParameterSpec(java.lang.String mdName, java.lang.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
java.lang.String	getDigestAlgorithm() Returns the message digest algorithm name.
java.lang.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, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT

@Deprecated
public static final OAEPParameterSpec DEFAULT

Deprecated. This field uses the default values defined in the PKCS #1 standard. Some of these defaults are no longer recommended due to advances in cryptanalysis -- see Appendix B.1 of PKCS #1 for more details. Thus, it is recommended to create a new OAEPParameterSpec with the desired parameter values using the OAEPParameterSpec(String, String, AlgorithmParameterSpec, PSource) constructor.

The OAEP parameter set with all default values, i.e. "SHA-1" as message digest algorithm, "MGF1" as mask generation function (mgf) algorithm, MGF1ParameterSpec.SHA1 as parameters for the mask generation function, and PSource.PSpecified.DEFAULT as the source of the encoding input.

Constructor Detail

OAEPParameterSpec

public OAEPParameterSpec(java.lang.String mdName,
                         java.lang.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:

java.lang.NullPointerException - if mdName, mgfName, or pSrc is null

Method Detail

getDigestAlgorithm

public java.lang.String getDigestAlgorithm()

Returns the message digest algorithm name.

Returns:

the message digest algorithm name.

getMGFAlgorithm

public java.lang.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.