using Org.BouncyCastle.Asn1.X509; using Org.BouncyCastle.Math; using Org.BouncyCastle.Utilities; using System; namespace Org.BouncyCastle.Asn1.Pkcs { public class Pbkdf2Params : Asn1Encodable { private static AlgorithmIdentifier algid_hmacWithSHA1 = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdHmacWithSha1, DerNull.Instance); private readonly Asn1OctetString octStr; private readonly DerInteger iterationCount; private readonly DerInteger keyLength; private readonly AlgorithmIdentifier prf; public BigInteger IterationCount => iterationCount.Value; public BigInteger KeyLength { get { if (keyLength != null) return keyLength.Value; return null; } } public bool IsDefaultPrf { get { if (prf != null) return prf.Equals(algid_hmacWithSHA1); return true; } } public AlgorithmIdentifier Prf { get { if (prf == null) return algid_hmacWithSHA1; return prf; } } public static Pbkdf2Params GetInstance(object obj) { if (obj == null || obj is Pbkdf2Params) return (Pbkdf2Params)obj; if (obj is Asn1Sequence) return new Pbkdf2Params((Asn1Sequence)obj); throw new ArgumentException("Unknown object in factory: " + Platform.GetTypeName(obj), "obj"); } public Pbkdf2Params(Asn1Sequence seq) { if (seq.Count < 2 || seq.Count > 4) throw new ArgumentException("Wrong number of elements in sequence", "seq"); octStr = (Asn1OctetString)seq[0]; iterationCount = (DerInteger)seq[1]; Asn1Encodable asn1Encodable = null; Asn1Encodable asn1Encodable2 = null; if (seq.Count > 3) { asn1Encodable = seq[2]; asn1Encodable2 = seq[3]; } else if (seq.Count > 2) { if (seq[2] is DerInteger) asn1Encodable = seq[2]; else asn1Encodable2 = seq[2]; } if (asn1Encodable != null) keyLength = (DerInteger)asn1Encodable; if (asn1Encodable2 != null) prf = AlgorithmIdentifier.GetInstance(asn1Encodable2); } public Pbkdf2Params(byte[] salt, int iterationCount) { octStr = new DerOctetString(salt); this.iterationCount = new DerInteger(iterationCount); } public Pbkdf2Params(byte[] salt, int iterationCount, int keyLength) : this(salt, iterationCount) { this.keyLength = new DerInteger(keyLength); } public Pbkdf2Params(byte[] salt, int iterationCount, int keyLength, AlgorithmIdentifier prf) : this(salt, iterationCount, keyLength) { this.prf = prf; } public Pbkdf2Params(byte[] salt, int iterationCount, AlgorithmIdentifier prf) : this(salt, iterationCount) { this.prf = prf; } public byte[] GetSalt() { return octStr.GetOctets(); } public override Asn1Object ToAsn1Object() { Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector(octStr, iterationCount); asn1EncodableVector.AddOptional(keyLength); if (!IsDefaultPrf) asn1EncodableVector.Add(prf); return new DerSequence(asn1EncodableVector); } } }