Module java.base
Package javax.crypto.spec

Class 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 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))

    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 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.