context: using System;
  using System.Collections;
  
  using Org.BouncyCastle.Asn1;
  using Org.BouncyCastle.Asn1.BC;
  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.Crypto;
  using Org.BouncyCastle.Crypto.Digests;
  using Org.BouncyCastle.Crypto.Engines;
  using Org.BouncyCastle.Crypto.Generators;
  using Org.BouncyCastle.Crypto.Macs;
  using Org.BouncyCastle.Crypto.Modes;
  using Org.BouncyCastle.Crypto.Paddings;
  using Org.BouncyCastle.Crypto.Parameters;
  using Org.BouncyCastle.Utilities;
  
  namespace Org.BouncyCastle.Security
  {
      /// <summary>
      ///
      /// </summary>
      public sealed class PbeUtilities
      {
          private PbeUtilities()
          {
          }
  
          const string Pkcs5S1 = "Pkcs5S1";
          const string Pkcs5S2 = "Pkcs5S2";
          const string Pkcs12 = "Pkcs12";
          const string OpenSsl = "OpenSsl";
  
          private static readonly IDictionary algorithms = Platform.CreateHashtable();
          private static readonly IDictionary algorithmType = Platform.CreateHashtable();
          private static readonly IDictionary oids = Platform.CreateHashtable();
  
          static PbeUtilities()
          {
              algorithms["PKCS5SCHEME1"] = "Pkcs5scheme1";
              algorithms["PKCS5SCHEME2"] = "Pkcs5scheme2";
              algorithms[PkcsObjectIdentifiers.IdPbeS2.Id] = "Pkcs5scheme2";
  //			algorithms[PkcsObjectIdentifiers.IdPbkdf2.Id] = "Pkcs5scheme2";
  
              // FIXME Add support for these? (see Pkcs8Generator)
  //			algorithms[PkcsObjectIdentifiers.DesEde3Cbc.Id] = "Pkcs5scheme2";
  //			algorithms[NistObjectIdentifiers.IdAes128Cbc.Id] = "Pkcs5scheme2";
  //			algorithms[NistObjectIdentifiers.IdAes192Cbc.Id] = "Pkcs5scheme2";
  //			algorithms[NistObjectIdentifiers.IdAes256Cbc.Id] = "Pkcs5scheme2";
  
              algorithms["PBEWITHMD2ANDDES-CBC"] = "PBEwithMD2andDES-CBC";
              algorithms[PkcsObjectIdentifiers.PbeWithMD2AndDesCbc.Id] = "PBEwithMD2andDES-CBC";
              algorithms["PBEWITHMD2ANDRC2-CBC"] = "PBEwithMD2andRC2-CBC";
              algorithms[PkcsObjectIdentifiers.PbeWithMD2AndRC2Cbc.Id] = "PBEwithMD2andRC2-CBC";
              algorithms["PBEWITHMD5ANDDES-CBC"] = "PBEwithMD5andDES-CBC";
              algorithms[PkcsObjectIdentifiers.PbeWithMD5AndDesCbc.Id] = "PBEwithMD5andDES-CBC";
              algorithms["PBEWITHMD5ANDRC2-CBC"] = "PBEwithMD5andRC2-CBC";
              algorithms[PkcsObjectIdentifiers.PbeWithMD5AndRC2Cbc.Id] = "PBEwithMD5andRC2-CBC";
              algorithms["PBEWITHSHA1ANDDES"] = "PBEwithSHA-1andDES-CBC";
              algorithms["PBEWITHSHA-1ANDDES"] = "PBEwithSHA-1andDES-CBC";
              algorithms["PBEWITHSHA1ANDDES-CBC"] = "PBEwithSHA-1andDES-CBC";
              algorithms["PBEWITHSHA-1ANDDES-CBC"] = "PBEwithSHA-1andDES-CBC";
              algorithms[PkcsObjectIdentifiers.PbeWithSha1AndDesCbc.Id] = "PBEwithSHA-1andDES-CBC";
              algorithms["PBEWITHSHA1ANDRC2"] = "PBEwithSHA-1andRC2-CBC";
              algorithms["PBEWITHSHA-1ANDRC2"] = "PBEwithSHA-1andRC2-CBC";
              algorithms["PBEWITHSHA1ANDRC2-CBC"] = "PBEwithSHA-1andRC2-CBC";
              algorithms["PBEWITHSHA-1ANDRC2-CBC"] = "PBEwithSHA-1andRC2-CBC";
              algorithms[PkcsObjectIdentifiers.PbeWithSha1AndRC2Cbc.Id] = "PBEwithSHA-1andRC2-CBC";
              algorithms["PKCS12"] = "Pkcs12";
              algorithms[BCObjectIdentifiers.bc_pbe_sha1_pkcs12_aes128_cbc.Id] = "PBEwithSHA-1and128bitAES-CBC-BC";
              algorithms[BCObjectIdentifiers.bc_pbe_sha1_pkcs12_aes192_cbc.Id] = "PBEwithSHA-1and192bitAES-CBC-BC";
              algorithms[BCObjectIdentifiers.bc_pbe_sha1_pkcs12_aes256_cbc.Id] = "PBEwithSHA-1and256bitAES-CBC-BC";
              algorithms[BCObjectIdentifiers.bc_pbe_sha256_pkcs12_aes128_cbc.Id] = "PBEwithSHA-256and128bitAES-CBC-BC";
              algorithms[BCObjectIdentifiers.bc_pbe_sha256_pkcs12_aes192_cbc.Id] = "PBEwithSHA-256and192bitAES-CBC-BC";
              algorithms[BCObjectIdentifiers.bc_pbe_sha256_pkcs12_aes256_cbc.Id] = "PBEwithSHA-256and256bitAES-CBC-BC";
              algorithms["PBEWITHSHAAND128BITRC4"] = "PBEwithSHA-1and128bitRC4";
              algorithms["PBEWITHSHA1AND128BITRC4"] = "PBEwithSHA-1and128bitRC4";
              algorithms["PBEWITHSHA-1AND128BITRC4"] = "PBEwithSHA-1and128bitRC4";
              algorithms[PkcsObjectIdentifiers.PbeWithShaAnd128BitRC4.Id] = "PBEwithSHA-1and128bitRC4";
              algorithms["PBEWITHSHAAND40BITRC4"] = "PBEwithSHA-1and40bitRC4";
              algorithms["PBEWITHSHA1AND40BITRC4"] = "PBEwithSHA-1and40bitRC4";
              algorithms["PBEWITHSHA-1AND40BITRC4"] = "PBEwithSHA-1and40bitRC4";
              algorithms[PkcsObjectIdentifiers.PbeWithShaAnd40BitRC4.Id] = "PBEwithSHA-1and40bitRC4";
              algorithms["PBEWITHSHAAND3-KEYDESEDE-CBC"] = "PBEwithSHA-1and3-keyDESEDE-CBC";
              algorithms["PBEWITHSHAAND3-KEYTRIPLEDES-CBC"] = "PBEwithSHA-1and3-keyDESEDE-CBC";
              algorithms["PBEWITHSHA1AND3-KEYDESEDE-CBC"] = "PBEwithSHA-1and3-keyDESEDE-CBC";
              algorithms["PBEWITHSHA1AND3-KEYTRIPLEDES-CBC"] = "PBEwithSHA-1and3-keyDESEDE-CBC";
              algorithms["PBEWITHSHA-1AND3-KEYDESEDE-CBC"] = "PBEwithSHA-1and3-keyDESEDE-CBC";
              algorithms["PBEWITHSHA-1AND3-KEYTRIPLEDES-CBC"] = "PBEwithSHA-1and3-keyDESEDE-CBC";
              algorithms[PkcsObjectIdentifiers.PbeWithShaAnd3KeyTripleDesCbc.Id] = "PBEwithSHA-1and3-keyDESEDE-CBC";
              algorithms["PBEWITHSHAAND2-KEYDESEDE-CBC"] = "PBEwithSHA-1and2-keyDESEDE-CBC";
              algorithms["PBEWITHSHAAND2-KEYTRIPLEDES-CBC"] = "PBEwithSHA-1and2-keyDESEDE-CBC";
              algorithms["PBEWITHSHA1AND2-KEYDESEDE-CBC"] = "PBEwithSHA-1and2-keyDESEDE-CBC";
              algorithms["PBEWITHSHA1AND2-KEYTRIPLEDES-CBC"] = "PBEwithSHA-1and2-keyDESEDE-CBC";
              algorithms["PBEWITHSHA-1AND2-KEYDESEDE-CBC"] = "PBEwithSHA-1and2-keyDESEDE-CBC";
              algorithms["PBEWITHSHA-1AND2-KEYTRIPLEDES-CBC"] = "PBEwithSHA-1and2-keyDESEDE-CBC";
              algorithms[PkcsObjectIdentifiers.PbeWithShaAnd2KeyTripleDesCbc.Id] = "PBEwithSHA-1and2-keyDESEDE-CBC";
              algorithms["PBEWITHSHAAND128BITRC2-CBC"] = "PBEwithSHA-1and128bitRC2-CBC";
              algorithms["PBEWITHSHA1AND128BITRC2-CBC"] = "PBEwithSHA-1and128bitRC2-CBC";
              algorithms["PBEWITHSHA-1AND128BITRC2-CBC"] = "PBEwithSHA-1and128bitRC2-CBC";
              algorithms[PkcsObjectIdentifiers.PbeWithShaAnd128BitRC2Cbc.Id] = "PBEwithSHA-1and128bitRC2-CBC";
              algorithms["PBEWITHSHAAND40BITRC2-CBC"] = "PBEwithSHA-1and40bitRC2-CBC";
              algorithms["PBEWITHSHA1AND40BITRC2-CBC"] = "PBEwithSHA-1and40bitRC2-CBC";
              algorithms["PBEWITHSHA-1AND40BITRC2-CBC"] = "PBEwithSHA-1and40bitRC2-CBC";
              algorithms[PkcsObjectIdentifiers.PbewithShaAnd40BitRC2Cbc.Id] = "PBEwithSHA-1and40bitRC2-CBC";
              algorithms["PBEWITHSHAAND128BITAES-CBC-BC"] = "PBEwithSHA-1and128bitAES-CBC-BC";
              algorithms["PBEWITHSHA1AND128BITAES-CBC-BC"] = "PBEwithSHA-1and128bitAES-CBC-BC";
              algorithms["PBEWITHSHA-1AND128BITAES-CBC-BC"] = "PBEwithSHA-1and128bitAES-CBC-BC";
              algorithms["PBEWITHSHAAND192BITAES-CBC-BC"] = "PBEwithSHA-1and192bitAES-CBC-BC";
              algorithms["PBEWITHSHA1AND192BITAES-CBC-BC"] = "PBEwithSHA-1and192bitAES-CBC-BC";
              algorithms["PBEWITHSHA-1AND192BITAES-CBC-BC"] = "PBEwithSHA-1and192bitAES-CBC-BC";
              algorithms["PBEWITHSHAAND256BITAES-CBC-BC"] = "PBEwithSHA-1and256bitAES-CBC-BC";
              algorithms["PBEWITHSHA1AND256BITAES-CBC-BC"] = "PBEwithSHA-1and256bitAES-CBC-BC";
              algorithms["PBEWITHSHA-1AND256BITAES-CBC-BC"] = "PBEwithSHA-1and256bitAES-CBC-BC";
              algorithms["PBEWITHSHA256AND128BITAES-CBC-BC"] = "PBEwithSHA-256and128bitAES-CBC-BC";
              algorithms["PBEWITHSHA-256AND128BITAES-CBC-BC"] = "PBEwithSHA-256and128bitAES-CBC-BC";
              algorithms["PBEWITHSHA256AND192BITAES-CBC-BC"] = "PBEwithSHA-256and192bitAES-CBC-BC";
              algorithms["PBEWITHSHA-256AND192BITAES-CBC-BC"] = "PBEwithSHA-256and192bitAES-CBC-BC";
              algorithms["PBEWITHSHA256AND256BITAES-CBC-BC"] = "PBEwithSHA-256and256bitAES-CBC-BC";
              algorithms["PBEWITHSHA-256AND256BITAES-CBC-BC"] = "PBEwithSHA-256and256bitAES-CBC-BC";
              algorithms["PBEWITHSHAANDIDEA"] = "PBEwithSHA-1andIDEA-CBC";
              algorithms["PBEWITHSHAANDIDEA-CBC"] = "PBEwithSHA-1andIDEA-CBC";
              algorithms["PBEWITHSHAANDTWOFISH"] = "PBEwithSHA-1andTWOFISH-CBC";
              algorithms["PBEWITHSHAANDTWOFISH-CBC"] = "PBEwithSHA-1andTWOFISH-CBC";
              algorithms["PBEWITHHMACSHA1"] = "PBEwithHmacSHA-1";
              algorithms["PBEWITHHMACSHA-1"] = "PBEwithHmacSHA-1";
              algorithms[OiwObjectIdentifiers.IdSha1.Id] = "PBEwithHmacSHA-1";
              algorithms["PBEWITHHMACSHA224"] = "PBEwithHmacSHA-224";
              algorithms["PBEWITHHMACSHA-224"] = "PBEwithHmacSHA-224";
              algorithms[NistObjectIdentifiers.IdSha224.Id] = "PBEwithHmacSHA-224";
              algorithms["PBEWITHHMACSHA256"] = "PBEwithHmacSHA-256";
              algorithms["PBEWITHHMACSHA-256"] = "PBEwithHmacSHA-256";
              algorithms[NistObjectIdentifiers.IdSha256.Id] = "PBEwithHmacSHA-256";
              algorithms["PBEWITHHMACRIPEMD128"] = "PBEwithHmacRipeMD128";
              algorithms[TeleTrusTObjectIdentifiers.RipeMD128.Id] = "PBEwithHmacRipeMD128";
              algorithms["PBEWITHHMACRIPEMD160"] = "PBEwithHmacRipeMD160";
              algorithms[TeleTrusTObjectIdentifiers.RipeMD160.Id] = "PBEwithHmacRipeMD160";
              algorithms["PBEWITHHMACRIPEMD256"] = "PBEwithHmacRipeMD256";
              algorithms[TeleTrusTObjectIdentifiers.RipeMD256.Id] = "PBEwithHmacRipeMD256";
              algorithms["PBEWITHHMACTIGER"] = "PBEwithHmacTiger";
  
              algorithms["PBEWITHMD5AND128BITAES-CBC-OPENSSL"] = "PBEwithMD5and128bitAES-CBC-OpenSSL";
              algorithms["PBEWITHMD5AND192BITAES-CBC-OPENSSL"] = "PBEwithMD5and192bitAES-CBC-OpenSSL";
              algorithms["PBEWITHMD5AND256BITAES-CBC-OPENSSL"] = "PBEwithMD5and256bitAES-CBC-OpenSSL";
  
              algorithmType["Pkcs5scheme1"] = Pkcs5S1;
              algorithmType["Pkcs5scheme2"] = Pkcs5S2;
              algorithmType["PBEwithMD2andDES-CBC"] = Pkcs5S1;
              algorithmType["PBEwithMD2andRC2-CBC"] = Pkcs5S1;
              algorithmType["PBEwithMD5andDES-CBC"] = Pkcs5S1;
              algorithmType["PBEwithMD5andRC2-CBC"] = Pkcs5S1;
              algorithmType["PBEwithSHA-1andDES-CBC"] = Pkcs5S1;
              algorithmType["PBEwithSHA-1andRC2-CBC"] = Pkcs5S1;
              algorithmType["Pkcs12"] = Pkcs12;
              algorithmType["PBEwithSHA-1and128bitRC4"] = Pkcs12;
              algorithmType["PBEwithSHA-1and40bitRC4"] = Pkcs12;
              algorithmType["PBEwithSHA-1and3-keyDESEDE-CBC"] = Pkcs12;
              algorithmType["PBEwithSHA-1and2-keyDESEDE-CBC"] = Pkcs12;
              algorithmType["PBEwithSHA-1and128bitRC2-CBC"] = Pkcs12;
              algorithmType["PBEwithSHA-1and40bitRC2-CBC"] = Pkcs12;
              algorithmType["PBEwithSHA-1and128bitAES-CBC-BC"] = Pkcs12;
              algorithmType["PBEwithSHA-1and192bitAES-CBC-BC"] = Pkcs12;
              algorithmType["PBEwithSHA-1and256bitAES-CBC-BC"] = Pkcs12;
              algorithmType["PBEwithSHA-256and128bitAES-CBC-BC"] = Pkcs12;
              algorithmType["PBEwithSHA-256and192bitAES-CBC-BC"] = Pkcs12;
              algorithmType["PBEwithSHA-256and256bitAES-CBC-BC"] = Pkcs12;
              algorithmType["PBEwithSHA-1andIDEA-CBC"] = Pkcs12;
              algorithmType["PBEwithSHA-1andTWOFISH-CBC"] = Pkcs12;
              algorithmType["PBEwithHmacSHA-1"] = Pkcs12;
              algorithmType["PBEwithHmacSHA-224"] = Pkcs12;
              algorithmType["PBEwithHmacSHA-256"] = Pkcs12;
              algorithmType["PBEwithHmacRipeMD128"] = Pkcs12;
              algorithmType["PBEwithHmacRipeMD160"] = Pkcs12;
              algorithmType["PBEwithHmacRipeMD256"] = Pkcs12;
              algorithmType["PBEwithHmacTiger"] = Pkcs12;
  
              algorithmType["PBEwithMD5and128bitAES-CBC-OpenSSL"] = OpenSsl;
              algorithmType["PBEwithMD5and192bitAES-CBC-OpenSSL"] = OpenSsl;
              algorithmType["PBEwithMD5and256bitAES-CBC-OpenSSL"] = OpenSsl;
  
              oids["PBEwithMD2andDES-CBC"] = PkcsObjectIdentifiers.PbeWithMD2AndDesCbc;
              oids["PBEwithMD2andRC2-CBC"] = PkcsObjectIdentifiers.PbeWithMD2AndRC2Cbc;
              oids["PBEwithMD5andDES-CBC"] = PkcsObjectIdentifiers.PbeWithMD5AndDesCbc;
              oids["PBEwithMD5andRC2-CBC"] = PkcsObjectIdentifiers.PbeWithMD5AndRC2Cbc;
              oids["PBEwithSHA-1andDES-CBC"] = PkcsObjectIdentifiers.PbeWithSha1AndDesCbc;
              oids["PBEwithSHA-1andRC2-CBC"] = PkcsObjectIdentifiers.PbeWithSha1AndRC2Cbc;
              oids["PBEwithSHA-1and128bitRC4"] = PkcsObjectIdentifiers.PbeWithShaAnd128BitRC4;
              oids["PBEwithSHA-1and40bitRC4"] = PkcsObjectIdentifiers.PbeWithShaAnd40BitRC4;
              oids["PBEwithSHA-1and3-keyDESEDE-CBC"] = PkcsObjectIdentifiers.PbeWithShaAnd3KeyTripleDesCbc;
              oids["PBEwithSHA-1and2-keyDESEDE-CBC"] = PkcsObjectIdentifiers.PbeWithShaAnd2KeyTripleDesCbc;
              oids["PBEwithSHA-1and128bitRC2-CBC"] = PkcsObjectIdentifiers.PbeWithShaAnd128BitRC2Cbc;
              oids["PBEwithSHA-1and40bitRC2-CBC"] = PkcsObjectIdentifiers.PbewithShaAnd40BitRC2Cbc;
              oids["PBEwithHmacSHA-1"] = OiwObjectIdentifiers.IdSha1;
              oids["PBEwithHmacSHA-224"] = NistObjectIdentifiers.IdSha224;
              oids["PBEwithHmacSHA-256"] = NistObjectIdentifiers.IdSha256;
              oids["PBEwithHmacRipeMD128"] = TeleTrusTObjectIdentifiers.RipeMD128;
              oids["PBEwithHmacRipeMD160"] = TeleTrusTObjectIdentifiers.RipeMD160;
              oids["PBEwithHmacRipeMD256"] = TeleTrusTObjectIdentifiers.RipeMD256;
              oids["Pkcs5scheme2"] = PkcsObjectIdentifiers.IdPbeS2;
          }
  
          static PbeParametersGenerator MakePbeGenerator(
              string	type,
              IDigest	digest,
              byte[]	key,
              byte[]	salt,
              int		iterationCount)
          {
              PbeParametersGenerator generator;
  
              if (type.Equals(Pkcs5S1))
              {
                  generator = new Pkcs5S1ParametersGenerator(digest);
              }
              else if (type.Equals(Pkcs5S2))
              {
                  generator = new Pkcs5S2ParametersGenerator();
              }
              else if (type.Equals(Pkcs12))
              {
                  generator = new Pkcs12ParametersGenerator(digest);
              }
              else if (type.Equals(OpenSsl))
              {
                  generator = new OpenSslPbeParametersGenerator();
              }
              else
              {
                  throw new ArgumentException("Unknown PBE type: " + type, "type");
              }
  
              generator.Init(key, salt, iterationCount);
              return generator;
          }
  
          /// <summary>
          /// Returns a ObjectIdentifier for a give encoding.
          /// </summary>
          /// <param name="mechanism">A string representation of the encoding.</param>
          /// <returns>A DerObjectIdentifier, null if the Oid is not available.</returns>
          public static DerObjectIdentifier GetObjectIdentifier(
              string mechanism)
          {
              mechanism = (string) algorithms[Platform.ToUpperInvariant(mechanism)];
              if (mechanism != null)
              {
                  return (DerObjectIdentifier)oids[mechanism];
              }
              return null;
          }
  
          public static ICollection Algorithms
          {
              get { return oids.Keys; }
          }
  
          public static bool IsPkcs12(
              string algorithm)
          {
              string mechanism = (string)algorithms[Platform.ToUpperInvariant(algorithm)];
  
              return mechanism != null && Pkcs12.Equals(algorithmType[mechanism]);
          }
  
          public static bool IsPkcs5Scheme1(
              string algorithm)
          {
              string mechanism = (string)algorithms[Platform.ToUpperInvariant(algorithm)];
  
              return mechanism != null && Pkcs5S1.Equals(algorithmType[mechanism]);
          }
  
          public static bool IsPkcs5Scheme2(
              string algorithm)
          {
              string mechanism = (string)algorithms[Platform.ToUpperInvariant(algorithm)];
  
              return mechanism != null && Pkcs5S2.Equals(algorithmType[mechanism]);
          }
  
          public static bool IsOpenSsl(
              string algorithm)
          {
              string mechanism = (string)algorithms[Platform.ToUpperInvariant(algorithm)];
  
              return mechanism != null && OpenSsl.Equals(algorithmType[mechanism]);
          }
  
          public static bool IsPbeAlgorithm(
              string algorithm)
          {
              string mechanism = (string)algorithms[Platform.ToUpperInvariant(algorithm)];
  
              return mechanism != null && algorithmType[mechanism] != null;
          }
  
          public static Asn1Encodable GenerateAlgorithmParameters(
              DerObjectIdentifier algorithmOid,
              byte[]              salt,
              int                 iterationCount)
          {
              return GenerateAlgorithmParameters(algorithmOid.Id, salt, iterationCount);
          }
  
          public static Asn1Encodable GenerateAlgorithmParameters(
              string  algorithm,
              byte[]  salt,
              int     iterationCount)
          {
              if (IsPkcs12(algorithm))
              {
                  return new Pkcs12PbeParams(salt, iterationCount);
              }
              else if (IsPkcs5Scheme2(algorithm))
              {
                  return new Pbkdf2Params(salt, iterationCount);
              }
              else
              {
                  return new PbeParameter(salt, iterationCount);
              }
          }
  
          public static ICipherParameters GenerateCipherParameters(
              DerObjectIdentifier algorithmOid,
              char[]              password,
              Asn1Encodable       pbeParameters)
          {
              return GenerateCipherParameters(algorithmOid.Id, password, false, pbeParameters);
          }
  
          public static ICipherParameters GenerateCipherParameters(
              DerObjectIdentifier algorithmOid,
              char[]              password,
              bool				wrongPkcs12Zero,
              Asn1Encodable       pbeParameters)
          {
              return GenerateCipherParameters(algorithmOid.Id, password, wrongPkcs12Zero, pbeParameters);
          }
  
          public static ICipherParameters GenerateCipherParameters(
              AlgorithmIdentifier algID,
              char[]              password)
          {
              return GenerateCipherParameters(algID.Algorithm.Id, password, false, algID.Parameters);
          }
  
          public static ICipherParameters GenerateCipherParameters(
              AlgorithmIdentifier algID,
              char[]              password,
              bool				wrongPkcs12Zero)
          {
              return GenerateCipherParameters(algID.Algorithm.Id, password, wrongPkcs12Zero, algID.Parameters);
          }
  
          public static ICipherParameters GenerateCipherParameters(
              string          algorithm,
              char[]          password,
              Asn1Encodable   pbeParameters)
          {
              return GenerateCipherParameters(algorithm, password, false, pbeParameters);
          }
  
          public static ICipherParameters GenerateCipherParameters(
              string          algorithm,
              char[]          password,
              bool			wrongPkcs12Zero,
              Asn1Encodable   pbeParameters)
          {
              string mechanism = (string)algorithms[Platform.ToUpperInvariant(algorithm)];
  
              byte[] keyBytes = null;
              byte[] salt = null;
              int iterationCount = 0;
  
              if (IsPkcs12(mechanism))
              {
                  Pkcs12PbeParams pbeParams = Pkcs12PbeParams.GetInstance(pbeParameters);
                  salt = pbeParams.GetIV();
                  iterationCount = pbeParams.Iterations.IntValue;
                  keyBytes = PbeParametersGenerator.Pkcs12PasswordToBytes(password, wrongPkcs12Zero);
              }
              else if (IsPkcs5Scheme2(mechanism))
              {
                  // See below
              }
              else
              {
                  PbeParameter pbeParams = PbeParameter.GetInstance(pbeParameters);
                  salt = pbeParams.GetSalt();
                  iterationCount = pbeParams.IterationCount.IntValue;
                  keyBytes = PbeParametersGenerator.Pkcs5PasswordToBytes(password);
              }
  
              ICipherParameters parameters = null;
  
              if (IsPkcs5Scheme2(mechanism))
              {
                  PbeS2Parameters s2p = PbeS2Parameters.GetInstance(pbeParameters.ToAsn1Object());
                  AlgorithmIdentifier encScheme = s2p.EncryptionScheme;
                  DerObjectIdentifier encOid = encScheme.Algorithm;
                  Asn1Object encParams = encScheme.Parameters.ToAsn1Object();
  
                  // TODO What about s2p.KeyDerivationFunc.Algorithm?
                  Pbkdf2Params pbeParams = Pbkdf2Params.GetInstance(s2p.KeyDerivationFunc.Parameters.ToAsn1Object());
  
                  byte[] iv;
                  if (encOid.Equals(PkcsObjectIdentifiers.RC2Cbc)) // PKCS5.B.2.3
                  {
                      RC2CbcParameter rc2Params = RC2CbcParameter.GetInstance(encParams);
                      iv = rc2Params.GetIV();
                  }
                  else
                  {
                      iv = Asn1OctetString.GetInstance(encParams).GetOctets();
                  }
  
                  salt = pbeParams.GetSalt();
                  iterationCount = pbeParams.IterationCount.IntValue;
                  keyBytes = PbeParametersGenerator.Pkcs5PasswordToBytes(password);
  
                  int keyLength = pbeParams.KeyLength != null
                      ?	pbeParams.KeyLength.IntValue * 8
                      :	GeneratorUtilities.GetDefaultKeySize(encOid);
  
                  PbeParametersGenerator gen = MakePbeGenerator(
                      (string)algorithmType[mechanism], null, keyBytes, salt, iterationCount);
  
                  parameters = gen.GenerateDerivedParameters(encOid.Id, keyLength);
  
                  if (iv != null)
                  {
                      // FIXME? OpenSSL weirdness with IV of zeros (for ECB keys?)
                      if (Arrays.AreEqual(iv, new byte[iv.Length]))
                      {
                          //Console.Error.Write("***** IV all 0 (length " + iv.Length + ") *****");
                      }
                      else
                      {
                          parameters = new ParametersWithIV(parameters, iv);
                      }
                  }
              }
              else if (Platform.StartsWith(mechanism, "PBEwithSHA-1"))
              {
                  PbeParametersGenerator generator = MakePbeGenerator(
                      (string) algorithmType[mechanism], new Sha1Digest(), keyBytes, salt, iterationCount);
  
                  if (mechanism.Equals("PBEwithSHA-1and128bitAES-CBC-BC"))
                  {
                      parameters = generator.GenerateDerivedParameters("AES", 128, 128);
                  }
                  else if (mechanism.Equals("PBEwithSHA-1and192bitAES-CBC-BC"))
                  {
                      parameters = generator.GenerateDerivedParameters("AES", 192, 128);
                  }
                  else if (mechanism.Equals("PBEwithSHA-1and256bitAES-CBC-BC"))
                  {
                      parameters = generator.GenerateDerivedParameters("AES", 256, 128);
                  }
                  else if (mechanism.Equals("PBEwithSHA-1and128bitRC4"))
                  {
                      parameters = generator.GenerateDerivedParameters("RC4", 128);
                  }
                  else if (mechanism.Equals("PBEwithSHA-1and40bitRC4"))
                  {
                      parameters = generator.GenerateDerivedParameters("RC4", 40);
                  }
                  else if (mechanism.Equals("PBEwithSHA-1and3-keyDESEDE-CBC"))
                  {
                      parameters = generator.GenerateDerivedParameters("DESEDE", 192, 64);
                  }
                  else if (mechanism.Equals("PBEwithSHA-1and2-keyDESEDE-CBC"))
                  {
                      parameters = generator.GenerateDerivedParameters("DESEDE", 128, 64);
                  }
                  else if (mechanism.Equals("PBEwithSHA-1and128bitRC2-CBC"))
                  {
                      parameters = generator.GenerateDerivedParameters("RC2", 128, 64);
                  }
                  else if (mechanism.Equals("PBEwithSHA-1and40bitRC2-CBC"))
                  {
                      parameters = generator.GenerateDerivedParameters("RC2", 40, 64);
                  }
                  else if (mechanism.Equals("PBEwithSHA-1andDES-CBC"))
                  {
                      parameters = generator.GenerateDerivedParameters("DES", 64, 64);
                  }
                  else if (mechanism.Equals("PBEwithSHA-1andRC2-CBC"))
                  {
                      parameters = generator.GenerateDerivedParameters("RC2", 64, 64);
                  }
              }
              else if (Platform.StartsWith(mechanism, "PBEwithSHA-256"))
              {
                  PbeParametersGenerator generator = MakePbeGenerator(
                      (string) algorithmType[mechanism], new Sha256Digest(), keyBytes, salt, iterationCount);
  
                  if (mechanism.Equals("PBEwithSHA-256and128bitAES-CBC-BC"))
                  {
                      parameters = generator.GenerateDerivedParameters("AES", 128, 128);
                  }
                  else if (mechanism.Equals("PBEwithSHA-256and192bitAES-CBC-BC"))
                  {
                      parameters = generator.GenerateDerivedParameters("AES", 192, 128);
                  }
                  else if (mechanism.Equals("PBEwithSHA-256and256bitAES-CBC-BC"))
                  {
                      parameters = generator.GenerateDerivedParameters("AES", 256, 128);
                  }
              }
              else if (Platform.StartsWith(mechanism, "PBEwithMD5"))
              {
                  PbeParametersGenerator generator = MakePbeGenerator(
                      (string)algorithmType[mechanism], new MD5Digest(), keyBytes, salt, iterationCount);
  
                  if (mechanism.Equals("PBEwithMD5andDES-CBC"))
                  {
                      parameters = generator.GenerateDerivedParameters("DES", 64, 64);
                  }
                  else if (mechanism.Equals("PBEwithMD5andRC2-CBC"))
                  {
                      parameters = generator.GenerateDerivedParameters("RC2", 64, 64);
                  }
                  else if (mechanism.Equals("PBEwithMD5and128bitAES-CBC-OpenSSL"))
                  {
                      parameters = generator.GenerateDerivedParameters("AES", 128, 128);
                  }
                  else if (mechanism.Equals("PBEwithMD5and192bitAES-CBC-OpenSSL"))
                  {
                      parameters = generator.GenerateDerivedParameters("AES", 192, 128);
                  }
                  else if (mechanism.Equals("PBEwithMD5and256bitAES-CBC-OpenSSL"))
                  {
                      parameters = generator.GenerateDerivedParameters("AES", 256, 128);
                  }
              }
              else if (Platform.StartsWith(mechanism, "PBEwithMD2"))
              {
                  PbeParametersGenerator generator = MakePbeGenerator(
                      (string)algorithmType[mechanism], new MD2Digest(), keyBytes, salt, iterationCount);
                  if (mechanism.Equals("PBEwithMD2andDES-CBC"))
                  {
                      parameters = generator.GenerateDerivedParameters("DES", 64, 64);
                  }
                  else if (mechanism.Equals("PBEwithMD2andRC2-CBC"))
                  {
                      parameters = generator.GenerateDerivedParameters("RC2", 64, 64);
                  }
              }
              else if (Platform.StartsWith(mechanism, "PBEwithHmac"))
              {
                  string digestName = mechanism.Substring("PBEwithHmac".Length);
                  IDigest digest = DigestUtilities.GetDigest(digestName);
  
                  PbeParametersGenerator generator = MakePbeGenerator(
                      (string) algorithmType[mechanism], digest, keyBytes, salt, iterationCount);
  
                  int bitLen = digest.GetDigestSize() * 8;
                  parameters = generator.GenerateDerivedMacParameters(bitLen);
              }
  
              Array.Clear(keyBytes, 0, keyBytes.Length);
  
              return FixDesParity(mechanism, parameters);
          }
  
          public static object CreateEngine(
              DerObjectIdentifier algorithmOid)
          {
              return CreateEngine(algorithmOid.Id);
          }
  
          public static object CreateEngine(
              AlgorithmIdentifier algID)
          {
              string algorithm = algID.Algorithm.Id;
  
              if (IsPkcs5Scheme2(algorithm))
              {
                  PbeS2Parameters s2p = PbeS2Parameters.GetInstance(algID.Parameters.ToAsn1Object());
                  AlgorithmIdentifier encScheme = s2p.EncryptionScheme;
                  return CipherUtilities.GetCipher(encScheme.Algorithm);
              }
  
              return CreateEngine(algorithm);
          }
  
          public static object CreateEngine(
              string algorithm)
          {
              string mechanism = (string)algorithms[Platform.ToUpperInvariant(algorithm)];
  
              if (Platform.StartsWith(mechanism, "PBEwithHmac"))
              {
  
gt:                 string digestName = mechanism.Substring("PBEwithHmac".Length);