public const int Unauthorized		= 6;	// Request unauthorized

		public OcspResp Generate(
			int     status,
			object  response)
		{
			if (response == null)
			{
				return new OcspResp(new OcspResponse(new OcspResponseStatus(status),null));
			}
			if (response is BasicOcspResp)
			{
				BasicOcspResp r = (BasicOcspResp)response;
				Asn1OctetString octs;

				try
				{
					octs = new DerOctetString(r.GetEncoded());
				}
				catch (Exception e)
				{
					throw new OcspException("can't encode object.", e);
				}

				ResponseBytes rb = new ResponseBytes(
					OcspObjectIdentifiers.PkixOcspBasic, octs);

				return new OcspResp(new OcspResponse(
					new OcspResponseStatus(status), rb));
			}

			throw new OcspException("unknown response object");
		}
		public RecipientInfo Generate(KeyParameter contentEncryptionKey, SecureRandom random)
		{
			byte[] keyBytes = contentEncryptionKey.GetKey();

			string rfc3211WrapperName = Helper.GetRfc3211WrapperName(keyEncryptionKeyOID);
			IWrapper keyWrapper = Helper.CreateWrapper(rfc3211WrapperName);

			// Note: In Java build, the IV is automatically generated in JCE layer
			int ivLength = rfc3211WrapperName.StartsWith("DESEDE") ? 8 : 16;
			byte[] iv = new byte[ivLength];
			random.NextBytes(iv);

			ICipherParameters parameters = new ParametersWithIV(keyEncryptionKey, iv);
			keyWrapper.Init(true, new ParametersWithRandom(parameters, random));
        	Asn1OctetString encryptedKey = new DerOctetString(
				keyWrapper.Wrap(keyBytes, 0, keyBytes.Length));

			DerSequence seq = new DerSequence(
				new DerObjectIdentifier(keyEncryptionKeyOID),
				new DerOctetString(iv));

			AlgorithmIdentifier keyEncryptionAlgorithm = new AlgorithmIdentifier(
				PkcsObjectIdentifiers.IdAlgPwriKek, seq);

			return new RecipientInfo(new PasswordRecipientInfo(
				keyDerivationAlgorithm, keyEncryptionAlgorithm, encryptedKey));
		}
		public RecipientInfo Generate(KeyParameter contentEncryptionKey, SecureRandom random)
		{
			byte[] keyBytes = contentEncryptionKey.GetKey();

			IWrapper keyWrapper = Helper.CreateWrapper(keyEncryptionAlgorithm.ObjectID.Id);
			keyWrapper.Init(true, new ParametersWithRandom(keyEncryptionKey, random));
        	Asn1OctetString encryptedKey = new DerOctetString(
				keyWrapper.Wrap(keyBytes, 0, keyBytes.Length));

			return new RecipientInfo(new KekRecipientInfo(kekIdentifier, keyEncryptionAlgorithm, encryptedKey));
		}
		public RecipientInfo Generate(KeyParameter contentEncryptionKey, SecureRandom random)
		{
			byte[] keyBytes = contentEncryptionKey.GetKey();

			AsymmetricKeyParameter senderPublicKey = senderKeyPair.Public;
			ICipherParameters senderPrivateParams = senderKeyPair.Private;


			OriginatorIdentifierOrKey originator;
			try
			{
				originator = new OriginatorIdentifierOrKey(
					CreateOriginatorPublicKey(senderPublicKey));
			}
			catch (IOException e)
			{
				throw new InvalidKeyException("cannot extract originator public key: " + e);
			}


			Asn1OctetString ukm = null;
			if (keyAgreementOID.Id.Equals(CmsEnvelopedGenerator.ECMqvSha1Kdf))
			{
				try
				{
					IAsymmetricCipherKeyPairGenerator ephemKPG =
						GeneratorUtilities.GetKeyPairGenerator(keyAgreementOID);
					ephemKPG.Init(
						((ECPublicKeyParameters)senderPublicKey).CreateKeyGenerationParameters(random));

					AsymmetricCipherKeyPair ephemKP = ephemKPG.GenerateKeyPair();

					ukm = new DerOctetString(
						new MQVuserKeyingMaterial(
							CreateOriginatorPublicKey(ephemKP.Public), null));

					senderPrivateParams = new MqvPrivateParameters(
						(ECPrivateKeyParameters)senderPrivateParams,
						(ECPrivateKeyParameters)ephemKP.Private,
						(ECPublicKeyParameters)ephemKP.Public);
				}
				catch (IOException e)
				{
					throw new InvalidKeyException("cannot extract MQV ephemeral public key: " + e);
				}
				catch (SecurityUtilityException e)
				{
					throw new InvalidKeyException("cannot determine MQV ephemeral key pair parameters from public key: " + e);
				}
			}


			DerSequence paramSeq = new DerSequence(
				keyEncryptionOID,
				DerNull.Instance);
			AlgorithmIdentifier keyEncAlg = new AlgorithmIdentifier(keyAgreementOID, paramSeq);


			Asn1EncodableVector recipientEncryptedKeys = new Asn1EncodableVector();
			foreach (X509Certificate recipientCert in recipientCerts)
			{
				TbsCertificateStructure tbsCert;
				try
				{
					tbsCert = TbsCertificateStructure.GetInstance(
						Asn1Object.FromByteArray(recipientCert.GetTbsCertificate()));
				}
				catch (Exception)
				{
					throw new ArgumentException("can't extract TBS structure from certificate");
				}

				// TODO Should there be a SubjectKeyIdentifier-based alternative?
				IssuerAndSerialNumber issuerSerial = new IssuerAndSerialNumber(
					tbsCert.Issuer, tbsCert.SerialNumber.Value);
				KeyAgreeRecipientIdentifier karid = new KeyAgreeRecipientIdentifier(issuerSerial);

				ICipherParameters recipientPublicParams = recipientCert.GetPublicKey();
				if (keyAgreementOID.Id.Equals(CmsEnvelopedGenerator.ECMqvSha1Kdf))
				{
					recipientPublicParams = new MqvPublicParameters(
						(ECPublicKeyParameters)recipientPublicParams,
						(ECPublicKeyParameters)recipientPublicParams);
				}

				// Use key agreement to choose a wrap key for this recipient
				IBasicAgreement keyAgreement = AgreementUtilities.GetBasicAgreementWithKdf(
					keyAgreementOID, keyEncryptionOID.Id);
				keyAgreement.Init(new ParametersWithRandom(senderPrivateParams, random));
				BigInteger agreedValue = keyAgreement.CalculateAgreement(recipientPublicParams);

				int keyEncryptionKeySize = GeneratorUtilities.GetDefaultKeySize(keyEncryptionOID) / 8;
				byte[] keyEncryptionKeyBytes = X9IntegerConverter.IntegerToBytes(agreedValue, keyEncryptionKeySize);
				KeyParameter keyEncryptionKey = ParameterUtilities.CreateKeyParameter(
					keyEncryptionOID, keyEncryptionKeyBytes);

				// Wrap the content encryption key with the agreement key
				IWrapper keyWrapper = Helper.CreateWrapper(keyEncryptionOID.Id);
				keyWrapper.Init(true, new ParametersWithRandom(keyEncryptionKey, random));
				byte[] encryptedKeyBytes = keyWrapper.Wrap(keyBytes, 0, keyBytes.Length);

	        	Asn1OctetString encryptedKey = new DerOctetString(encryptedKeyBytes);

				recipientEncryptedKeys.Add(new RecipientEncryptedKey(karid, encryptedKey));
			}

			return new RecipientInfo(new KeyAgreeRecipientInfo(originator, ukm, keyEncAlg,
				new DerSequence(recipientEncryptedKeys)));
		}
		public static AsymmetricKeyParameter CreateKey(
			SubjectPublicKeyInfo keyInfo)
        {
            AlgorithmIdentifier algID = keyInfo.AlgorithmID;
			DerObjectIdentifier algOid = algID.ObjectID;

			// TODO See RSAUtil.isRsaOid in Java build
			if (algOid.Equals(PkcsObjectIdentifiers.RsaEncryption)
				|| algOid.Equals(X509ObjectIdentifiers.IdEARsa)
				|| algOid.Equals(PkcsObjectIdentifiers.IdRsassaPss)
				|| algOid.Equals(PkcsObjectIdentifiers.IdRsaesOaep))
			{
				RsaPublicKeyStructure pubKey = RsaPublicKeyStructure.GetInstance(
					keyInfo.GetPublicKey());

				return new RsaKeyParameters(false, pubKey.Modulus, pubKey.PublicExponent);
			}
			else if (algOid.Equals(X9ObjectIdentifiers.DHPublicNumber))
			{
				Asn1Sequence seq = Asn1Sequence.GetInstance(algID.Parameters.ToAsn1Object());

				DHPublicKey dhPublicKey = DHPublicKey.GetInstance(keyInfo.GetPublicKey());

				BigInteger y = dhPublicKey.Y.Value;

				if (IsPkcsDHParam(seq))
					return ReadPkcsDHParam(algOid, y, seq);

				DHDomainParameters dhParams = DHDomainParameters.GetInstance(seq);

				BigInteger p = dhParams.P.Value;
				BigInteger g = dhParams.G.Value;
				BigInteger q = dhParams.Q.Value;

				BigInteger j = null;
				if (dhParams.J != null)
				{
					j = dhParams.J.Value;
				}

				DHValidationParameters validation = null;
				DHValidationParms dhValidationParms = dhParams.ValidationParms;
				if (dhValidationParms != null)
				{
					byte[] seed = dhValidationParms.Seed.GetBytes();
					BigInteger pgenCounter = dhValidationParms.PgenCounter.Value;

					// TODO Check pgenCounter size?

					validation = new DHValidationParameters(seed, pgenCounter.IntValue);
				}

				return new DHPublicKeyParameters(y, new DHParameters(p, g, q, j, validation));
			}
			else if (algOid.Equals(PkcsObjectIdentifiers.DhKeyAgreement))
			{
				Asn1Sequence seq = Asn1Sequence.GetInstance(algID.Parameters.ToAsn1Object());

				DerInteger derY = (DerInteger) keyInfo.GetPublicKey();

				return ReadPkcsDHParam(algOid, derY.Value, seq);
			}
			else if (algOid.Equals(OiwObjectIdentifiers.ElGamalAlgorithm))
			{
				ElGamalParameter para = new ElGamalParameter(
					Asn1Sequence.GetInstance(algID.Parameters.ToAsn1Object()));
				DerInteger derY = (DerInteger) keyInfo.GetPublicKey();

				return new ElGamalPublicKeyParameters(
					derY.Value,
					new ElGamalParameters(para.P, para.G));
			}
			else if (algOid.Equals(X9ObjectIdentifiers.IdDsa)
				|| algOid.Equals(OiwObjectIdentifiers.DsaWithSha1))
			{
				DerInteger derY = (DerInteger) keyInfo.GetPublicKey();
				Asn1Encodable ae = algID.Parameters;

				DsaParameters parameters = null;
				if (ae != null)
				{
					DsaParameter para = DsaParameter.GetInstance(ae.ToAsn1Object());
					parameters = new DsaParameters(para.P, para.Q, para.G);
				}

				return new DsaPublicKeyParameters(derY.Value, parameters);
			}
			else if (algOid.Equals(X9ObjectIdentifiers.IdECPublicKey))
			{
				X962Parameters para = new X962Parameters(
					algID.Parameters.ToAsn1Object());
				X9ECParameters ecP;

				if (para.IsNamedCurve)
				{
					ecP = ECKeyPairGenerator.FindECCurveByOid((DerObjectIdentifier)para.Parameters);
				}
				else
				{
					ecP = new X9ECParameters((Asn1Sequence)para.Parameters);
				}

				ECDomainParameters dParams = new ECDomainParameters(
					ecP.Curve,
					ecP.G,
					ecP.N,
					ecP.H,
					ecP.GetSeed());

				DerBitString bits = keyInfo.PublicKeyData;
				byte[] data = bits.GetBytes();
				Asn1OctetString key = new DerOctetString(data);

				X9ECPoint derQ = new X9ECPoint(dParams.Curve, key);

				return new ECPublicKeyParameters(derQ.Point, dParams);
			}
			else if (algOid.Equals(CryptoProObjectIdentifiers.GostR3410x2001))
			{
				Gost3410PublicKeyAlgParameters gostParams = new Gost3410PublicKeyAlgParameters(
					(Asn1Sequence) algID.Parameters);

				Asn1OctetString key;
				try
				{
					key = (Asn1OctetString) keyInfo.GetPublicKey();
				}
				catch (IOException)
				{
					throw new ArgumentException("invalid info structure in GOST3410 public key");
				}

				byte[] keyEnc = key.GetOctets();
				byte[] x = new byte[32];
				byte[] y = new byte[32];

				for (int i = 0; i != y.Length; i++)
				{
					x[i] = keyEnc[32 - 1 - i];
				}

				for (int i = 0; i != x.Length; i++)
				{
					y[i] = keyEnc[64 - 1 - i];
				}

				ECDomainParameters ecP = ECGost3410NamedCurves.GetByOid(gostParams.PublicKeyParamSet);

				if (ecP == null)
					return null;

				ECPoint q = ecP.Curve.CreatePoint(new BigInteger(1, x), new BigInteger(1, y), false);

				return new ECPublicKeyParameters("ECGOST3410", q, gostParams.PublicKeyParamSet);
			}
			else if (algOid.Equals(CryptoProObjectIdentifiers.GostR3410x94))
			{
				Gost3410PublicKeyAlgParameters algParams = new Gost3410PublicKeyAlgParameters(
					(Asn1Sequence) algID.Parameters);

				DerOctetString derY;
				try
				{
					derY = (DerOctetString) keyInfo.GetPublicKey();
				}
				catch (IOException)
				{
					throw new ArgumentException("invalid info structure in GOST3410 public key");
				}

				byte[] keyEnc = derY.GetOctets();
				byte[] keyBytes = new byte[keyEnc.Length];

				for (int i = 0; i != keyEnc.Length; i++)
				{
					keyBytes[i] = keyEnc[keyEnc.Length - 1 - i]; // was little endian
				}

				BigInteger y = new BigInteger(1, keyBytes);

				return new Gost3410PublicKeyParameters(y, algParams.PublicKeyParamSet);
			}
            else
            {
                throw new SecurityUtilityException("algorithm identifier in key not recognised: " + algOid);
            }
        }
	    /**
	     * generate an enveloped object that contains an CMS Enveloped Data
	     * object using the given provider and the passed in key generator.
	     */
		private CmsAuthenticatedData Generate(
			CmsProcessable		content,
			string				macOid,
			CipherKeyGenerator	keyGen)
		{
			AlgorithmIdentifier macAlgId;
			KeyParameter encKey;
			Asn1OctetString encContent;
			Asn1OctetString macResult;

			try
			{
				// FIXME Will this work for macs?
				byte[] encKeyBytes = keyGen.GenerateKey();
				encKey = ParameterUtilities.CreateKeyParameter(macOid, encKeyBytes);

				Asn1Encodable asn1Params = GenerateAsn1Parameters(macOid, encKeyBytes);

				ICipherParameters cipherParameters;
				macAlgId = GetAlgorithmIdentifier(
				macOid, encKey, asn1Params, out cipherParameters);

				IMac mac = MacUtilities.GetMac(macOid);
				// TODO Confirm no ParametersWithRandom needed
				// FIXME Only passing key at the moment
//	            mac.Init(cipherParameters);
				mac.Init(encKey);

				MemoryStream bOut = new MemoryStream();
				Stream mOut = new TeeOutputStream(bOut, new MacOutputStream(mac));

				content.Write(mOut);

				mOut.Dispose();
                bOut.Dispose();

				encContent = new BerOctetString(bOut.ToArray());

				byte[] macOctets = MacUtilities.DoFinal(mac);
				macResult = new DerOctetString(macOctets);
			}
			catch (SecurityUtilityException e)
			{
				throw new CmsException("couldn't create cipher.", e);
			}
			catch (InvalidKeyException e)
			{
				throw new CmsException("key invalid in message.", e);
			}
			catch (IOException e)
			{
				throw new CmsException("exception decoding algorithm parameters.", e);
			}

			Asn1EncodableVector recipientInfos = new Asn1EncodableVector();

			foreach (RecipientInfoGenerator rig in recipientInfoGenerators) 
			{
				try
				{
					recipientInfos.Add(rig.Generate(encKey, rand));
				}
				catch (InvalidKeyException e)
				{
					throw new CmsException("key inappropriate for algorithm.", e);
				}
				catch (GeneralSecurityException e)
				{
					throw new CmsException("error making encrypted content.", e);
				}
			}
			
			ContentInfo eci = new ContentInfo(CmsObjectIdentifiers.Data, encContent);
			
			ContentInfo contentInfo = new ContentInfo(
			CmsObjectIdentifiers.AuthenticatedData,
			new AuthenticatedData(null, new DerSet(recipientInfos), macAlgId, null, eci, null, macResult, null));
			
			return new CmsAuthenticatedData(contentInfo);
		}