Class OAEPParameterSpec

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
 }

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