java.lang.Object
javax.crypto.spec.OAEPParameterSpec
- All Implemented Interfaces:
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:
-
Field Summary
Modifier and TypeFieldDescriptionstatic final OAEPParameterSpec
Deprecated.This field uses the default values defined in the PKCS #1 standard. -
Constructor Summary
ConstructorDescriptionOAEPParameterSpec
(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 algorithmmdName
, mask generation function algorithmmgfName
, parameters for the mask generation functionmgfSpec
, and source of the encoding input PpSrc
. -
Method Summary
Modifier and TypeMethodDescriptionReturns the message digest algorithm name.Returns the mask generation function algorithm name.Returns the parameters for the mask generation function.Returns the source of encoding input P.
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Field Details
-
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 newOAEPParameterSpec
with the desired parameter values using theOAEPParameterSpec(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, andPSource.PSpecified.DEFAULT
as the source of the encoding input.
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Constructor Details
-
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 algorithmmdName
, mask generation function algorithmmgfName
, parameters for the mask generation functionmgfSpec
, and source of the encoding input PpSrc
.- Parameters:
mdName
- the algorithm name for the message digestmgfName
- the algorithm name for the mask generation functionmgfSpec
- the parameters for the mask generation function; ifnull
is specified,null
will be returned bygetMGFParameters()
pSrc
- the source of the encoding input P- Throws:
NullPointerException
- ifmdName
,mgfName
, orpSrc
isnull
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Method Details
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getDigestAlgorithm
Returns the message digest algorithm name.- Returns:
- the message digest algorithm name.
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getMGFAlgorithm
Returns the mask generation function algorithm name.- Returns:
- the mask generation function algorithm name.
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getMGFParameters
Returns the parameters for the mask generation function.- Returns:
- the parameters for the mask generation function.
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getPSource
Returns the source of encoding input P.- Returns:
- the source of encoding input P.
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