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using System;
using Org.BouncyCastle.Asn1.Oiw;
using Org.BouncyCastle.Asn1.X509;
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, new DerOctetString(new byte[0]));
public static RsaesOaepParameters GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is RsaesOaepParameters rsaesOaepParameters)
return rsaesOaepParameters;
#pragma warning disable CS0618 // Type or member is obsolete
return new RsaesOaepParameters(Asn1Sequence.GetInstance(obj));
#pragma warning restore CS0618 // Type or member is obsolete
}
public static RsaesOaepParameters GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
#pragma warning disable CS0618 // Type or member is obsolete
return new RsaesOaepParameters(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#pragma warning restore CS0618 // Type or member is obsolete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 AlgorithmIdentifier m_pSourceAlgorithm;
[Obsolete("Use 'GetInstance' instead")]
public RsaesOaepParameters(Asn1Sequence seq)
{
int count = seq.Count, pos = 0;
if (count < 0 || count > 3)
throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
m_hashAlgorithm = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 0, true, AlgorithmIdentifier.GetTagged)
?? DefaultHashAlgorithm;
m_maskGenAlgorithm = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 1, true, AlgorithmIdentifier.GetTagged)
?? DefaultMaskGenAlgorithm;
m_pSourceAlgorithm = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 2, true, AlgorithmIdentifier.GetTagged)
?? DefaultPSourceAlgorithm;
if (pos != count)
throw new ArgumentException("Unexpected elements in sequence", nameof(seq));
}
/**
* The default version
*/
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 AlgorithmIdentifier HashAlgorithm => m_hashAlgorithm;
public AlgorithmIdentifier MaskGenAlgorithm => m_maskGenAlgorithm;
public AlgorithmIdentifier PSourceAlgorithm => m_pSourceAlgorithm;
/**
* <pre>
* RSAES-OAEP-params ::= SEQUENCE {
* hashAlgorithm [0] OAEP-PSSDigestAlgorithms DEFAULT sha1,
* maskGenAlgorithm [1] PKCS1MGFAlgorithms DEFAULT mgf1SHA1,
* pSourceAlgorithm [2] PKCS1PSourceAlgorithms DEFAULT pSpecifiedEmpty
* }
*
* 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 --
* }
* PKCS1PSourceAlgorithms ALGORITHM-IDENTIFIER ::= {
* { OID id-pSpecified PARAMETERS OCTET STRING },
* ... -- Allows for future expansion --
* }
* </pre>
* @return the asn1 primitive representing the parameters.
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(3);
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 (!DefaultPSourceAlgorithm.Equals(m_pSourceAlgorithm))
{
v.Add(new DerTaggedObject(true, 2, m_pSourceAlgorithm));
}
return new DerSequence(v);
}
}
}
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