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using System;
using Org.BouncyCastle.Asn1.Oiw;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.Pkcs
{
public class RsaesOaepParameters
: Asn1Encodable
{
private AlgorithmIdentifier hashAlgorithm;
private AlgorithmIdentifier maskGenAlgorithm;
private AlgorithmIdentifier pSourceAlgorithm;
public readonly static AlgorithmIdentifier DefaultHashAlgorithm = new AlgorithmIdentifier(OiwObjectIdentifiers.IdSha1, DerNull.Instance);
public readonly static AlgorithmIdentifier DefaultMaskGenFunction = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdMgf1, DefaultHashAlgorithm);
public readonly static AlgorithmIdentifier DefaultPSourceAlgorithm = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdPSpecified, new DerOctetString(new byte[0]));
public static RsaesOaepParameters GetInstance(
object obj)
{
if (obj is RsaesOaepParameters)
{
return (RsaesOaepParameters)obj;
}
else if (obj is Asn1Sequence)
{
return new RsaesOaepParameters((Asn1Sequence)obj);
}
throw new ArgumentException("Unknown object in factory: " + Platform.GetTypeName(obj), "obj");
}
/**
* The default version
*/
public RsaesOaepParameters()
: this(DefaultHashAlgorithm, DefaultMaskGenFunction, DefaultPSourceAlgorithm)
{
}
public RsaesOaepParameters(
AlgorithmIdentifier hashAlgorithm,
AlgorithmIdentifier maskGenAlgorithm)
: this(hashAlgorithm, maskGenAlgorithm, DefaultPSourceAlgorithm)
{
}
public RsaesOaepParameters(
AlgorithmIdentifier hashAlgorithm,
AlgorithmIdentifier maskGenAlgorithm,
AlgorithmIdentifier pSourceAlgorithm)
{
this.hashAlgorithm = hashAlgorithm;
this.maskGenAlgorithm = maskGenAlgorithm;
this.pSourceAlgorithm = pSourceAlgorithm;
}
public RsaesOaepParameters(
Asn1Sequence seq)
{
hashAlgorithm = DefaultHashAlgorithm;
maskGenAlgorithm = DefaultMaskGenFunction;
pSourceAlgorithm = DefaultPSourceAlgorithm;
for (int i = 0; i != seq.Count; i++)
{
Asn1TaggedObject o = (Asn1TaggedObject)seq[i];
switch (o.TagNo)
{
case 0:
hashAlgorithm = AlgorithmIdentifier.GetInstance(o, true);
break;
case 1:
maskGenAlgorithm = AlgorithmIdentifier.GetInstance(o, true);
break;
case 2:
pSourceAlgorithm = AlgorithmIdentifier.GetInstance(o, true);
break;
default:
throw new ArgumentException("unknown tag");
}
}
}
public AlgorithmIdentifier HashAlgorithm
{
get { return hashAlgorithm; }
}
public AlgorithmIdentifier MaskGenAlgorithm
{
get { return maskGenAlgorithm; }
}
public AlgorithmIdentifier PSourceAlgorithm
{
get { return 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();
if (!hashAlgorithm.Equals(DefaultHashAlgorithm))
{
v.Add(new DerTaggedObject(true, 0, hashAlgorithm));
}
if (!maskGenAlgorithm.Equals(DefaultMaskGenFunction))
{
v.Add(new DerTaggedObject(true, 1, maskGenAlgorithm));
}
if (!pSourceAlgorithm.Equals(DefaultPSourceAlgorithm))
{
v.Add(new DerTaggedObject(true, 2, pSourceAlgorithm));
}
return new DerSequence(v);
}
}
}
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