RsaUtilities
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Nist;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities;
using System;
using System.IO;
namespace Org.BouncyCastle.Tls.Crypto.Impl
{
public abstract class RsaUtilities
{
private static readonly byte[] RSAPSSParams_256_A;
private static readonly byte[] RSAPSSParams_384_A;
private static readonly byte[] RSAPSSParams_512_A;
private static readonly byte[] RSAPSSParams_256_B;
private static readonly byte[] RSAPSSParams_384_B;
private static readonly byte[] RSAPSSParams_512_B;
static RsaUtilities()
{
AlgorithmIdentifier algorithmIdentifier = new AlgorithmIdentifier(NistObjectIdentifiers.IdSha256);
AlgorithmIdentifier algorithmIdentifier2 = new AlgorithmIdentifier(NistObjectIdentifiers.IdSha384);
AlgorithmIdentifier algorithmIdentifier3 = new AlgorithmIdentifier(NistObjectIdentifiers.IdSha512);
AlgorithmIdentifier algorithmIdentifier4 = new AlgorithmIdentifier(NistObjectIdentifiers.IdSha256, DerNull.Instance);
AlgorithmIdentifier algorithmIdentifier5 = new AlgorithmIdentifier(NistObjectIdentifiers.IdSha384, DerNull.Instance);
AlgorithmIdentifier algorithmIdentifier6 = new AlgorithmIdentifier(NistObjectIdentifiers.IdSha512, DerNull.Instance);
AlgorithmIdentifier maskGenAlgorithm = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdMgf1, algorithmIdentifier);
AlgorithmIdentifier maskGenAlgorithm2 = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdMgf1, algorithmIdentifier2);
AlgorithmIdentifier maskGenAlgorithm3 = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdMgf1, algorithmIdentifier3);
AlgorithmIdentifier maskGenAlgorithm4 = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdMgf1, algorithmIdentifier4);
AlgorithmIdentifier maskGenAlgorithm5 = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdMgf1, algorithmIdentifier5);
AlgorithmIdentifier maskGenAlgorithm6 = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdMgf1, algorithmIdentifier6);
DerInteger saltLength = new DerInteger(TlsCryptoUtilities.GetHashOutputSize(4));
DerInteger saltLength2 = new DerInteger(TlsCryptoUtilities.GetHashOutputSize(5));
DerInteger saltLength3 = new DerInteger(TlsCryptoUtilities.GetHashOutputSize(6));
DerInteger one = DerInteger.One;
try {
RSAPSSParams_256_A = new RsassaPssParameters(algorithmIdentifier, maskGenAlgorithm, saltLength, one).GetEncoded("DER");
RSAPSSParams_384_A = new RsassaPssParameters(algorithmIdentifier2, maskGenAlgorithm2, saltLength2, one).GetEncoded("DER");
RSAPSSParams_512_A = new RsassaPssParameters(algorithmIdentifier3, maskGenAlgorithm3, saltLength3, one).GetEncoded("DER");
RSAPSSParams_256_B = new RsassaPssParameters(algorithmIdentifier4, maskGenAlgorithm4, saltLength, one).GetEncoded("DER");
RSAPSSParams_384_B = new RsassaPssParameters(algorithmIdentifier5, maskGenAlgorithm5, saltLength2, one).GetEncoded("DER");
RSAPSSParams_512_B = new RsassaPssParameters(algorithmIdentifier6, maskGenAlgorithm6, saltLength3, one).GetEncoded("DER");
} catch (IOException ex) {
throw new InvalidOperationException(ex.Message);
}
}
public static bool SupportsPkcs1(AlgorithmIdentifier pubKeyAlgID)
{
DerObjectIdentifier algorithm = pubKeyAlgID.Algorithm;
if (!PkcsObjectIdentifiers.RsaEncryption.Equals(algorithm))
return X509ObjectIdentifiers.IdEARsa.Equals(algorithm);
return true;
}
public static bool SupportsPss_Pss(short signatureAlgorithm, AlgorithmIdentifier pubKeyAlgID)
{
DerObjectIdentifier algorithm = pubKeyAlgID.Algorithm;
if (!PkcsObjectIdentifiers.IdRsassaPss.Equals(algorithm))
return false;
Asn1Encodable parameters = pubKeyAlgID.Parameters;
if (parameters == null || parameters is DerNull) {
if ((uint)(signatureAlgorithm - 9) <= 2)
return true;
return false;
}
byte[] encoded;
try {
encoded = parameters.ToAsn1Object().GetEncoded("DER");
} catch (Exception) {
return false;
}
byte[] a;
byte[] a2;
switch (signatureAlgorithm) {
case 9:
a = RSAPSSParams_256_A;
a2 = RSAPSSParams_256_B;
break;
case 10:
a = RSAPSSParams_384_A;
a2 = RSAPSSParams_384_B;
break;
case 11:
a = RSAPSSParams_512_A;
a2 = RSAPSSParams_512_B;
break;
default:
return false;
}
if (!Arrays.AreEqual(a, encoded))
return Arrays.AreEqual(a2, encoded);
return true;
}
public static bool SupportsPss_Rsae(AlgorithmIdentifier pubKeyAlgID)
{
DerObjectIdentifier algorithm = pubKeyAlgID.Algorithm;
return PkcsObjectIdentifiers.RsaEncryption.Equals(algorithm);
}
}
}