diff --git a/Crypto/src/x509/X509Utilities.cs b/Crypto/src/x509/X509Utilities.cs
new file mode 100644
index 000000000..000958340
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+++ b/Crypto/src/x509/X509Utilities.cs
@@ -0,0 +1,188 @@
+using System;
+using System.Collections;
+using System.Globalization;
+using System.IO;
+
+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;
+using Org.BouncyCastle.Crypto.Parameters;
+using Org.BouncyCastle.Security;
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.Utilities.Collections;
+
+namespace Org.BouncyCastle.X509
+{
+ internal class X509Utilities
+ {
+ private static readonly IDictionary algorithms = Platform.CreateHashtable();
+ private static readonly IDictionary exParams = Platform.CreateHashtable();
+ private static readonly ISet noParams = new HashSet();
+
+ static X509Utilities()
+ {
+ algorithms.Add("MD2WITHRSAENCRYPTION", PkcsObjectIdentifiers.MD2WithRsaEncryption);
+ algorithms.Add("MD2WITHRSA", PkcsObjectIdentifiers.MD2WithRsaEncryption);
+ algorithms.Add("MD5WITHRSAENCRYPTION", PkcsObjectIdentifiers.MD5WithRsaEncryption);
+ algorithms.Add("MD5WITHRSA", PkcsObjectIdentifiers.MD5WithRsaEncryption);
+ algorithms.Add("SHA1WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha1WithRsaEncryption);
+ algorithms.Add("SHA1WITHRSA", PkcsObjectIdentifiers.Sha1WithRsaEncryption);
+ algorithms.Add("SHA224WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha224WithRsaEncryption);
+ algorithms.Add("SHA224WITHRSA", PkcsObjectIdentifiers.Sha224WithRsaEncryption);
+ algorithms.Add("SHA256WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha256WithRsaEncryption);
+ algorithms.Add("SHA256WITHRSA", PkcsObjectIdentifiers.Sha256WithRsaEncryption);
+ algorithms.Add("SHA384WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha384WithRsaEncryption);
+ algorithms.Add("SHA384WITHRSA", PkcsObjectIdentifiers.Sha384WithRsaEncryption);
+ algorithms.Add("SHA512WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha512WithRsaEncryption);
+ algorithms.Add("SHA512WITHRSA", PkcsObjectIdentifiers.Sha512WithRsaEncryption);
+ algorithms.Add("SHA1WITHRSAANDMGF1", PkcsObjectIdentifiers.IdRsassaPss);
+ algorithms.Add("SHA224WITHRSAANDMGF1", PkcsObjectIdentifiers.IdRsassaPss);
+ algorithms.Add("SHA256WITHRSAANDMGF1", PkcsObjectIdentifiers.IdRsassaPss);
+ algorithms.Add("SHA384WITHRSAANDMGF1", PkcsObjectIdentifiers.IdRsassaPss);
+ algorithms.Add("SHA512WITHRSAANDMGF1", PkcsObjectIdentifiers.IdRsassaPss);
+ algorithms.Add("RIPEMD160WITHRSAENCRYPTION", TeleTrusTObjectIdentifiers.RsaSignatureWithRipeMD160);
+ algorithms.Add("RIPEMD160WITHRSA", TeleTrusTObjectIdentifiers.RsaSignatureWithRipeMD160);
+ algorithms.Add("RIPEMD128WITHRSAENCRYPTION", TeleTrusTObjectIdentifiers.RsaSignatureWithRipeMD128);
+ algorithms.Add("RIPEMD128WITHRSA", TeleTrusTObjectIdentifiers.RsaSignatureWithRipeMD128);
+ algorithms.Add("RIPEMD256WITHRSAENCRYPTION", TeleTrusTObjectIdentifiers.RsaSignatureWithRipeMD256);
+ algorithms.Add("RIPEMD256WITHRSA", TeleTrusTObjectIdentifiers.RsaSignatureWithRipeMD256);
+ algorithms.Add("SHA1WITHDSA", X9ObjectIdentifiers.IdDsaWithSha1);
+ algorithms.Add("DSAWITHSHA1", X9ObjectIdentifiers.IdDsaWithSha1);
+ algorithms.Add("SHA224WITHDSA", NistObjectIdentifiers.DsaWithSha224);
+ algorithms.Add("SHA256WITHDSA", NistObjectIdentifiers.DsaWithSha256);
+ algorithms.Add("SHA384WITHDSA", NistObjectIdentifiers.DsaWithSha384);
+ algorithms.Add("SHA512WITHDSA", NistObjectIdentifiers.DsaWithSha512);
+ algorithms.Add("SHA1WITHECDSA", X9ObjectIdentifiers.ECDsaWithSha1);
+ algorithms.Add("ECDSAWITHSHA1", X9ObjectIdentifiers.ECDsaWithSha1);
+ algorithms.Add("SHA224WITHECDSA", X9ObjectIdentifiers.ECDsaWithSha224);
+ algorithms.Add("SHA256WITHECDSA", X9ObjectIdentifiers.ECDsaWithSha256);
+ algorithms.Add("SHA384WITHECDSA", X9ObjectIdentifiers.ECDsaWithSha384);
+ algorithms.Add("SHA512WITHECDSA", X9ObjectIdentifiers.ECDsaWithSha512);
+ algorithms.Add("GOST3411WITHGOST3410", CryptoProObjectIdentifiers.GostR3411x94WithGostR3410x94);
+ algorithms.Add("GOST3411WITHGOST3410-94", CryptoProObjectIdentifiers.GostR3411x94WithGostR3410x94);
+ algorithms.Add("GOST3411WITHECGOST3410", CryptoProObjectIdentifiers.GostR3411x94WithGostR3410x2001);
+ algorithms.Add("GOST3411WITHECGOST3410-2001", CryptoProObjectIdentifiers.GostR3411x94WithGostR3410x2001);
+ algorithms.Add("GOST3411WITHGOST3410-2001", CryptoProObjectIdentifiers.GostR3411x94WithGostR3410x2001);
+
+ //
+ // According to RFC 3279, the ASN.1 encoding SHALL (id-dsa-with-sha1) or MUST (ecdsa-with-SHA*) omit the parameters field.
+ // The parameters field SHALL be NULL for RSA based signature algorithms.
+ //
+ noParams.Add(X9ObjectIdentifiers.ECDsaWithSha1);
+ noParams.Add(X9ObjectIdentifiers.ECDsaWithSha224);
+ noParams.Add(X9ObjectIdentifiers.ECDsaWithSha256);
+ noParams.Add(X9ObjectIdentifiers.ECDsaWithSha384);
+ noParams.Add(X9ObjectIdentifiers.ECDsaWithSha512);
+ noParams.Add(X9ObjectIdentifiers.IdDsaWithSha1);
+ noParams.Add(NistObjectIdentifiers.DsaWithSha224);
+ noParams.Add(NistObjectIdentifiers.DsaWithSha256);
+ noParams.Add(NistObjectIdentifiers.DsaWithSha384);
+ noParams.Add(NistObjectIdentifiers.DsaWithSha512);
+
+ //
+ // RFC 4491
+ //
+ noParams.Add(CryptoProObjectIdentifiers.GostR3411x94WithGostR3410x94);
+ noParams.Add(CryptoProObjectIdentifiers.GostR3411x94WithGostR3410x2001);
+
+ //
+ // explicit params
+ //
+ AlgorithmIdentifier sha1AlgId = new AlgorithmIdentifier(OiwObjectIdentifiers.IdSha1, DerNull.Instance);
+ exParams.Add("SHA1WITHRSAANDMGF1", CreatePssParams(sha1AlgId, 20));
+
+ AlgorithmIdentifier sha224AlgId = new AlgorithmIdentifier(NistObjectIdentifiers.IdSha224, DerNull.Instance);
+ exParams.Add("SHA224WITHRSAANDMGF1", CreatePssParams(sha224AlgId, 28));
+
+ AlgorithmIdentifier sha256AlgId = new AlgorithmIdentifier(NistObjectIdentifiers.IdSha256, DerNull.Instance);
+ exParams.Add("SHA256WITHRSAANDMGF1", CreatePssParams(sha256AlgId, 32));
+
+ AlgorithmIdentifier sha384AlgId = new AlgorithmIdentifier(NistObjectIdentifiers.IdSha384, DerNull.Instance);
+ exParams.Add("SHA384WITHRSAANDMGF1", CreatePssParams(sha384AlgId, 48));
+
+ AlgorithmIdentifier sha512AlgId = new AlgorithmIdentifier(NistObjectIdentifiers.IdSha512, DerNull.Instance);
+ exParams.Add("SHA512WITHRSAANDMGF1", CreatePssParams(sha512AlgId, 64));
+ }
+
+ private static RsassaPssParameters CreatePssParams(
+ AlgorithmIdentifier hashAlgId,
+ int saltSize)
+ {
+ return new RsassaPssParameters(
+ hashAlgId,
+ new AlgorithmIdentifier(PkcsObjectIdentifiers.IdMgf1, hashAlgId),
+ new DerInteger(saltSize),
+ new DerInteger(1));
+ }
+
+ internal static DerObjectIdentifier GetAlgorithmOid(
+ string algorithmName)
+ {
+ algorithmName = algorithmName.ToUpperInvariant();
+
+ if (algorithms.Contains(algorithmName))
+ {
+ return (DerObjectIdentifier) algorithms[algorithmName];
+ }
+
+ return new DerObjectIdentifier(algorithmName);
+ }
+
+ internal static AlgorithmIdentifier GetSigAlgID(
+ DerObjectIdentifier sigOid,
+ string algorithmName)
+ {
+ if (noParams.Contains(sigOid))
+ {
+ return new AlgorithmIdentifier(sigOid);
+ }
+
+ algorithmName = algorithmName.ToUpperInvariant();
+
+ if (exParams.Contains(algorithmName))
+ {
+ return new AlgorithmIdentifier(sigOid, (Asn1Encodable) exParams[algorithmName]);
+ }
+
+ return new AlgorithmIdentifier(sigOid, DerNull.Instance);
+ }
+
+ internal static IEnumerable GetAlgNames()
+ {
+ return new EnumerableProxy(algorithms.Keys);
+ }
+
+ internal static byte[] GetSignatureForObject(
+ DerObjectIdentifier sigOid, // TODO Redundant now?
+ string sigName,
+ AsymmetricKeyParameter privateKey,
+ SecureRandom random,
+ Asn1Encodable ae)
+ {
+ if (sigOid == null)
+ throw new ArgumentNullException("sigOid");
+
+ ISigner sig = SignerUtilities.GetSigner(sigName);
+
+ if (random != null)
+ {
+ sig.Init(true, new ParametersWithRandom(privateKey, random));
+ }
+ else
+ {
+ sig.Init(true, privateKey);
+ }
+
+ byte[] encoded = ae.GetDerEncoded();
+ sig.BlockUpdate(encoded, 0, encoded.Length);
+
+ return sig.GenerateSignature();
+ }
+ }
+}
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