using Org.BouncyCastle.Asn1.Oiw; using Org.BouncyCastle.Asn1.X509; using Org.BouncyCastle.Utilities; using System; namespace Org.BouncyCastle.Asn1.Pkcs { public class RsassaPssParameters : Asn1Encodable { private AlgorithmIdentifier hashAlgorithm; private AlgorithmIdentifier maskGenAlgorithm; private DerInteger saltLength; private DerInteger trailerField; public static readonly AlgorithmIdentifier DefaultHashAlgorithm = new AlgorithmIdentifier(OiwObjectIdentifiers.IdSha1, DerNull.Instance); public static readonly AlgorithmIdentifier DefaultMaskGenFunction = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdMgf1, DefaultHashAlgorithm); public static readonly DerInteger DefaultSaltLength = new DerInteger(20); public static readonly DerInteger DefaultTrailerField = new DerInteger(1); public AlgorithmIdentifier HashAlgorithm => hashAlgorithm; public AlgorithmIdentifier MaskGenAlgorithm => maskGenAlgorithm; public DerInteger SaltLength => saltLength; public DerInteger TrailerField => trailerField; public static RsassaPssParameters GetInstance(object obj) { if (obj == null || obj is RsassaPssParameters) return (RsassaPssParameters)obj; if (obj is Asn1Sequence) return new RsassaPssParameters((Asn1Sequence)obj); throw new ArgumentException("Unknown object in factory: " + Platform.GetTypeName(obj), "obj"); } public RsassaPssParameters() { hashAlgorithm = DefaultHashAlgorithm; maskGenAlgorithm = DefaultMaskGenFunction; saltLength = DefaultSaltLength; trailerField = DefaultTrailerField; } public RsassaPssParameters(AlgorithmIdentifier hashAlgorithm, AlgorithmIdentifier maskGenAlgorithm, DerInteger saltLength, DerInteger trailerField) { this.hashAlgorithm = hashAlgorithm; this.maskGenAlgorithm = maskGenAlgorithm; this.saltLength = saltLength; this.trailerField = trailerField; } public RsassaPssParameters(Asn1Sequence seq) { hashAlgorithm = DefaultHashAlgorithm; maskGenAlgorithm = DefaultMaskGenFunction; saltLength = DefaultSaltLength; trailerField = DefaultTrailerField; for (int i = 0; i != seq.Count; i++) { Asn1TaggedObject asn1TaggedObject = (Asn1TaggedObject)seq[i]; switch (asn1TaggedObject.TagNo) { case 0: hashAlgorithm = AlgorithmIdentifier.GetInstance(asn1TaggedObject, true); break; case 1: maskGenAlgorithm = AlgorithmIdentifier.GetInstance(asn1TaggedObject, true); break; case 2: saltLength = DerInteger.GetInstance(asn1TaggedObject, true); break; case 3: trailerField = DerInteger.GetInstance(asn1TaggedObject, true); break; default: throw new ArgumentException("unknown tag"); } } } public override Asn1Object ToAsn1Object() { Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector(4); if (!hashAlgorithm.Equals(DefaultHashAlgorithm)) asn1EncodableVector.Add(new DerTaggedObject(true, 0, hashAlgorithm)); if (!maskGenAlgorithm.Equals(DefaultMaskGenFunction)) asn1EncodableVector.Add(new DerTaggedObject(true, 1, maskGenAlgorithm)); if (!saltLength.Equals(DefaultSaltLength)) asn1EncodableVector.Add(new DerTaggedObject(true, 2, saltLength)); if (!trailerField.Equals(DefaultTrailerField)) asn1EncodableVector.Add(new DerTaggedObject(true, 3, trailerField)); return new DerSequence(asn1EncodableVector); } } }