RsaesOaepParameters
using Org.BouncyCastle.Asn1.Oiw;
using Org.BouncyCastle.Asn1.X509;
using System;
namespace Org.BouncyCastle.Asn1.Pkcs
{
public class RsaesOaepParameters : Asn1Encodable
{
public static readonly AlgorithmIdentifier DefaultHashAlgorithm = new AlgorithmIdentifier(OiwObjectIdentifiers.IdSha1, DerNull.Instance);
public static readonly AlgorithmIdentifier DefaultMaskGenAlgorithm = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdMgf1, DefaultHashAlgorithm);
[Obsolete("Use 'DefaultMaskGenAlgorithm' instead")]
public static readonly AlgorithmIdentifier DefaultMaskGenFunction = DefaultMaskGenAlgorithm;
public static readonly AlgorithmIdentifier DefaultPSourceAlgorithm = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdPSpecified, DerOctetString.Empty);
private readonly AlgorithmIdentifier m_hashAlgorithm;
private readonly AlgorithmIdentifier m_maskGenAlgorithm;
private readonly AlgorithmIdentifier m_pSourceAlgorithm;
public AlgorithmIdentifier HashAlgorithm => m_hashAlgorithm;
public AlgorithmIdentifier MaskGenAlgorithm => m_maskGenAlgorithm;
public AlgorithmIdentifier PSourceAlgorithm => m_pSourceAlgorithm;
public static RsaesOaepParameters GetInstance(object obj)
{
if (obj == null)
return null;
RsaesOaepParameters rsaesOaepParameters = obj as RsaesOaepParameters;
if (rsaesOaepParameters != null)
return rsaesOaepParameters;
return new RsaesOaepParameters(Asn1Sequence.GetInstance(obj));
}
public static RsaesOaepParameters GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return new RsaesOaepParameters(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
}
public static RsaesOaepParameters GetTagged(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return new RsaesOaepParameters(Asn1Sequence.GetTagged(taggedObject, declaredExplicit));
}
[Obsolete("Use 'GetInstance' instead")]
public RsaesOaepParameters(Asn1Sequence seq)
{
int count = seq.Count;
int sequencePosition = 0;
if (count < 0 || count > 3)
throw new ArgumentException("Bad sequence size: " + count.ToString(), "seq");
m_hashAlgorithm = (Asn1Utilities.ReadOptionalContextTagged(seq, ref sequencePosition, 0, true, AlgorithmIdentifier.GetTagged) ?? DefaultHashAlgorithm);
m_maskGenAlgorithm = (Asn1Utilities.ReadOptionalContextTagged(seq, ref sequencePosition, 1, true, AlgorithmIdentifier.GetTagged) ?? DefaultMaskGenAlgorithm);
m_pSourceAlgorithm = (Asn1Utilities.ReadOptionalContextTagged(seq, ref sequencePosition, 2, true, AlgorithmIdentifier.GetTagged) ?? DefaultPSourceAlgorithm);
if (sequencePosition != count)
throw new ArgumentException("Unexpected elements in sequence", "seq");
}
public RsaesOaepParameters()
: this(DefaultHashAlgorithm, DefaultMaskGenAlgorithm, DefaultPSourceAlgorithm)
{
}
public RsaesOaepParameters(AlgorithmIdentifier hashAlgorithm, AlgorithmIdentifier maskGenAlgorithm)
: this(hashAlgorithm, maskGenAlgorithm, DefaultPSourceAlgorithm)
{
}
public RsaesOaepParameters(AlgorithmIdentifier hashAlgorithm, AlgorithmIdentifier maskGenAlgorithm, AlgorithmIdentifier pSourceAlgorithm)
{
m_hashAlgorithm = hashAlgorithm;
m_maskGenAlgorithm = maskGenAlgorithm;
m_pSourceAlgorithm = pSourceAlgorithm;
}
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector(3);
if (!DefaultHashAlgorithm.Equals(m_hashAlgorithm))
asn1EncodableVector.Add(new DerTaggedObject(true, 0, m_hashAlgorithm));
if (!DefaultMaskGenAlgorithm.Equals(m_maskGenAlgorithm))
asn1EncodableVector.Add(new DerTaggedObject(true, 1, m_maskGenAlgorithm));
if (!DefaultPSourceAlgorithm.Equals(m_pSourceAlgorithm))
asn1EncodableVector.Add(new DerTaggedObject(true, 2, m_pSourceAlgorithm));
return new DerSequence(asn1EncodableVector);
}
}
}