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using System;
using Org.BouncyCastle.Asn1.Oiw;
using Org.BouncyCastle.Asn1.X509;
namespace Org.BouncyCastle.Asn1.Pkcs
{
public class RsassaPssParameters
: Asn1Encodable
{
public readonly static AlgorithmIdentifier DefaultHashAlgorithm = new AlgorithmIdentifier(OiwObjectIdentifiers.IdSha1, DerNull.Instance);
public readonly static AlgorithmIdentifier DefaultMaskGenAlgorithm = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdMgf1, DefaultHashAlgorithm);
[Obsolete("Use 'DefaultMaskGenAlgorithm' instead")]
public readonly static AlgorithmIdentifier DefaultMaskGenFunction = DefaultMaskGenAlgorithm;
public readonly static DerInteger DefaultSaltLength = new DerInteger(20);
public readonly static DerInteger DefaultTrailerField = DerInteger.One;
public static RsassaPssParameters GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is RsassaPssParameters rsassaPssParameters)
return rsassaPssParameters;
#pragma warning disable CS0618 // Type or member is obsolete
return new RsassaPssParameters(Asn1Sequence.GetInstance(obj));
#pragma warning restore CS0618 // Type or member is obsolete
}
public static RsassaPssParameters GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
#pragma warning disable CS0618 // Type or member is obsolete
return new RsassaPssParameters(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
#pragma warning restore CS0618 // Type or member is obsolete
}
private readonly AlgorithmIdentifier m_hashAlgorithm;
private readonly AlgorithmIdentifier m_maskGenAlgorithm;
private readonly DerInteger m_saltLength;
private readonly DerInteger m_trailerField;
[Obsolete("Use 'GetInstance' instead")]
public RsassaPssParameters(Asn1Sequence seq)
{
int count = seq.Count, pos = 0;
if (count < 0 || count > 4)
throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
m_hashAlgorithm = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 0, true, AlgorithmIdentifier.GetInstance)
?? DefaultHashAlgorithm;
m_maskGenAlgorithm = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 1, true, AlgorithmIdentifier.GetInstance)
?? DefaultMaskGenAlgorithm;
m_saltLength = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 2, true, DerInteger.GetInstance)
?? DefaultSaltLength;
m_trailerField = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 3, true, DerInteger.GetInstance)
?? DefaultTrailerField;
if (pos != count)
throw new ArgumentException("Unexpected elements in sequence", nameof(seq));
}
/**
* The default version
*/
public RsassaPssParameters()
{
m_hashAlgorithm = DefaultHashAlgorithm;
m_maskGenAlgorithm = DefaultMaskGenAlgorithm;
m_saltLength = DefaultSaltLength;
m_trailerField = DefaultTrailerField;
}
public RsassaPssParameters(AlgorithmIdentifier hashAlgorithm, AlgorithmIdentifier maskGenAlgorithm,
DerInteger saltLength, DerInteger trailerField)
{
m_hashAlgorithm = hashAlgorithm ?? DefaultHashAlgorithm;
m_maskGenAlgorithm = maskGenAlgorithm ?? DefaultMaskGenAlgorithm;
m_saltLength = saltLength ?? DefaultSaltLength;
m_trailerField = trailerField ?? DefaultTrailerField;
}
public AlgorithmIdentifier HashAlgorithm => m_hashAlgorithm;
public AlgorithmIdentifier MaskGenAlgorithm => m_maskGenAlgorithm;
public DerInteger SaltLength => m_saltLength;
public DerInteger TrailerField => m_trailerField;
/**
* <pre>
* RSASSA-PSS-params ::= SEQUENCE {
* hashAlgorithm [0] OAEP-PSSDigestAlgorithms DEFAULT sha1,
* maskGenAlgorithm [1] PKCS1MGFAlgorithms DEFAULT mgf1SHA1,
* saltLength [2] INTEGER DEFAULT 20,
* trailerField [3] TrailerField DEFAULT trailerFieldBC
* }
*
* OAEP-PSSDigestAlgorithms ALGORITHM-IDENTIFIER ::= {
* { OID id-sha1 PARAMETERS NULL }|
* { OID id-sha256 PARAMETERS NULL }|
* { OID id-sha384 PARAMETERS NULL }|
* { OID id-sha512 PARAMETERS NULL },
* ... -- Allows for future expansion --
* }
*
* PKCS1MGFAlgorithms ALGORITHM-IDENTIFIER ::= {
* { OID id-mgf1 PARAMETERS OAEP-PSSDigestAlgorithms },
* ... -- Allows for future expansion --
* }
*
* TrailerField ::= INTEGER { trailerFieldBC(1) }
* </pre>
* @return the asn1 primitive representing the parameters.
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(4);
if (!DefaultHashAlgorithm.Equals(m_hashAlgorithm))
{
v.Add(new DerTaggedObject(true, 0, m_hashAlgorithm));
}
if (!DefaultMaskGenAlgorithm.Equals(m_maskGenAlgorithm))
{
v.Add(new DerTaggedObject(true, 1, m_maskGenAlgorithm));
}
if (!DefaultSaltLength.Equals(m_saltLength))
{
v.Add(new DerTaggedObject(true, 2, m_saltLength));
}
if (!DefaultTrailerField.Equals(m_trailerField))
{
v.Add(new DerTaggedObject(true, 3, m_trailerField));
}
return new DerSequence(v);
}
}
}
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