1 files changed, 128 insertions, 0 deletions
diff --git a/Crypto/src/x509/X509SignatureUtil.cs b/Crypto/src/x509/X509SignatureUtil.cs
new file mode 100644
index 000000000..7a4ab1448
--- /dev/null
+++ b/Crypto/src/x509/X509SignatureUtil.cs
@@ -0,0 +1,128 @@
+using System;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.CryptoPro;
+using Org.BouncyCastle.Asn1.Nist;
+using Org.BouncyCastle.Asn1.Oiw;
+using Org.BouncyCastle.Asn1.Pkcs;
+using Org.BouncyCastle.Asn1.TeleTrust;
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Asn1.X9;
+using Org.BouncyCastle.Crypto;
+
+namespace Org.BouncyCastle.X509
+{
+	internal class X509SignatureUtilities
+	{
+		private static readonly Asn1Null derNull = DerNull.Instance;
+
+		internal static void SetSignatureParameters(
+			ISigner			signature,
+			Asn1Encodable	parameters)
+		{
+			if (parameters != null && !derNull.Equals(parameters))
+			{
+				// TODO Put back in
+//				AlgorithmParameters sigParams = AlgorithmParameters.GetInstance(signature.getAlgorithm());
+//
+//				try
+//				{
+//					sigParams.Init(parameters.ToAsn1Object().GetDerEncoded());
+//				}
+//				catch (IOException e)
+//				{
+//					throw new SignatureException("IOException decoding parameters: " + e.Message);
+//				}
+//
+//				if (signature.getAlgorithm().EndsWith("MGF1"))
+//				{
+//					try
+//					{
+//						signature.setParameter(sigParams.getParameterSpec(PSSParameterSpec.class));
+//					}
+//					catch (GeneralSecurityException e)
+//					{
+//						throw new SignatureException("Exception extracting parameters: " + e.Message);
+//					}
+//				}
+			}
+		}
+
+		internal static string GetSignatureName(
+			AlgorithmIdentifier sigAlgId)
+		{
+			Asn1Encodable parameters = sigAlgId.Parameters;
+
+			if (parameters != null && !derNull.Equals(parameters))
+			{
+				if (sigAlgId.ObjectID.Equals(PkcsObjectIdentifiers.IdRsassaPss))
+				{
+					RsassaPssParameters rsaParams = RsassaPssParameters.GetInstance(parameters);
+
+					return GetDigestAlgName(rsaParams.HashAlgorithm.ObjectID) + "withRSAandMGF1";
+				}
+				if (sigAlgId.ObjectID.Equals(X9ObjectIdentifiers.ECDsaWithSha2))
+				{
+					Asn1Sequence ecDsaParams = Asn1Sequence.GetInstance(parameters);
+
+					return GetDigestAlgName((DerObjectIdentifier)ecDsaParams[0]) + "withECDSA";
+				}
+			}
+
+			return sigAlgId.ObjectID.Id;
+		}
+
+		/**
+		 * Return the digest algorithm using one of the standard JCA string
+		 * representations rather than the algorithm identifier (if possible).
+		 */
+		private static string GetDigestAlgName(
+			DerObjectIdentifier digestAlgOID)
+		{
+			if (PkcsObjectIdentifiers.MD5.Equals(digestAlgOID))
+			{
+				return "MD5";
+			}
+			else if (OiwObjectIdentifiers.IdSha1.Equals(digestAlgOID))
+			{
+				return "SHA1";
+			}
+			else if (NistObjectIdentifiers.IdSha224.Equals(digestAlgOID))
+			{
+				return "SHA224";
+			}
+			else if (NistObjectIdentifiers.IdSha256.Equals(digestAlgOID))
+			{
+				return "SHA256";
+			}
+			else if (NistObjectIdentifiers.IdSha384.Equals(digestAlgOID))
+			{
+				return "SHA384";
+			}
+			else if (NistObjectIdentifiers.IdSha512.Equals(digestAlgOID))
+			{
+				return "SHA512";
+			}
+			else if (TeleTrusTObjectIdentifiers.RipeMD128.Equals(digestAlgOID))
+			{
+				return "RIPEMD128";
+			}
+			else if (TeleTrusTObjectIdentifiers.RipeMD160.Equals(digestAlgOID))
+			{
+				return "RIPEMD160";
+			}
+			else if (TeleTrusTObjectIdentifiers.RipeMD256.Equals(digestAlgOID))
+			{
+				return "RIPEMD256";
+			}
+			else if (CryptoProObjectIdentifiers.GostR3411.Equals(digestAlgOID))
+			{
+				return "GOST3411";
+			}
+			else
+			{
+				return digestAlgOID.Id;
+			}
+		}
+	}
+}