using System; namespace Org.BouncyCastle.Asn1.Pkcs { public class PbeS2Parameters : Asn1Encodable { private readonly KeyDerivationFunc func; private readonly EncryptionScheme scheme; public KeyDerivationFunc KeyDerivationFunc => func; public EncryptionScheme EncryptionScheme => scheme; public static PbeS2Parameters GetInstance(object obj) { if (obj == null) return null; PbeS2Parameters pbeS2Parameters = obj as PbeS2Parameters; if (pbeS2Parameters != null) return pbeS2Parameters; return new PbeS2Parameters(Asn1Sequence.GetInstance(obj)); } public PbeS2Parameters(KeyDerivationFunc keyDevFunc, EncryptionScheme encScheme) { func = keyDevFunc; scheme = encScheme; } private PbeS2Parameters(Asn1Sequence seq) { if (seq.Count != 2) throw new ArgumentException("Wrong number of elements in sequence", "seq"); Asn1Sequence asn1Sequence = (Asn1Sequence)seq[0].ToAsn1Object(); if (asn1Sequence[0].Equals(PkcsObjectIdentifiers.IdPbkdf2)) func = new KeyDerivationFunc(PkcsObjectIdentifiers.IdPbkdf2, Pbkdf2Params.GetInstance(asn1Sequence[1])); else func = new KeyDerivationFunc(asn1Sequence); scheme = EncryptionScheme.GetInstance(seq[1].ToAsn1Object()); } public override Asn1Object ToAsn1Object() { return new DerSequence(func, scheme); } } }