Class OAEPParameterSpec
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
- External Specifications
- See Also:
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final OAEPParameterSpecDeprecated.This field uses the default values defined in the PKCS #1 standard. -
Constructor Summary
ConstructorsConstructorDescriptionOAEPParameterSpec(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
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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 newOAEPParameterSpecwith 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.SHA1as parameters for the mask generation function, andPSource.PSpecified.DEFAULTas the source of the encoding input.
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Constructor Details
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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; ifnullis specified,nullwill be returned bygetMGFParameters()pSrc- the source of the encoding input P- Throws:
NullPointerException- ifmdName,mgfName, orpSrcisnull
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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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