146 lines
3.6 KiB
C#
146 lines
3.6 KiB
C#
using System;
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using System.Collections;
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using System.Globalization;
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using Org.BouncyCastle.Asn1;
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using Org.BouncyCastle.Asn1.Kisa;
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using Org.BouncyCastle.Asn1.Nist;
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using Org.BouncyCastle.Asn1.Ntt;
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using Org.BouncyCastle.Asn1.Pkcs;
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using Org.BouncyCastle.Crypto;
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using Org.BouncyCastle.Crypto.Engines;
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namespace Org.BouncyCastle.Security
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{
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/// <remarks>
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/// Utility class for creating IWrapper objects from their names/Oids
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/// </remarks>
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public sealed class WrapperUtilities
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{
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private WrapperUtilities()
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{
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}
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private static readonly Hashtable algorithms = new Hashtable();
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// private static readonly Hashtable oids = new Hashtable();
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static WrapperUtilities()
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{
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algorithms[NistObjectIdentifiers.IdAes128Wrap.Id] = "AESWRAP";
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algorithms[NistObjectIdentifiers.IdAes192Wrap.Id] = "AESWRAP";
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algorithms[NistObjectIdentifiers.IdAes256Wrap.Id] = "AESWRAP";
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algorithms[NttObjectIdentifiers.IdCamellia128Wrap.Id] = "CAMELLIAWRAP";
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algorithms[NttObjectIdentifiers.IdCamellia192Wrap.Id] = "CAMELLIAWRAP";
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algorithms[NttObjectIdentifiers.IdCamellia256Wrap.Id] = "CAMELLIAWRAP";
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algorithms[PkcsObjectIdentifiers.IdAlgCms3DesWrap.Id] = "DESEDEWRAP";
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algorithms[PkcsObjectIdentifiers.IdAlgCmsRC2Wrap.Id] = "RC2WRAP";
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algorithms[KisaObjectIdentifiers.IdNpkiAppCmsSeedWrap.Id] = "SEEDWRAP";
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}
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public static IWrapper GetWrapper(
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DerObjectIdentifier oid)
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{
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return GetWrapper(oid.Id);
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}
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public static IWrapper GetWrapper(
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string algorithm)
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{
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string upper = algorithm.ToUpper(CultureInfo.InvariantCulture);
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string mechanism = (string) algorithms[upper];
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if (mechanism == null)
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{
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mechanism = upper;
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}
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switch (mechanism)
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{
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case "AESWRAP":
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return new AesWrapEngine();
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case "CAMELLIAWRAP":
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return new CamelliaWrapEngine();
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case "DESEDEWRAP":
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return new DesEdeWrapEngine();
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case "RC2WRAP":
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return new RC2WrapEngine();
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case "SEEDWRAP":
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return new SeedWrapEngine();
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case "DESEDERFC3211WRAP":
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return new Rfc3211WrapEngine(new DesEdeEngine());
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case "AESRFC3211WRAP":
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return new Rfc3211WrapEngine(new AesFastEngine());
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case "CAMELLIARFC3211WRAP":
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return new Rfc3211WrapEngine(new CamelliaEngine());
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}
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// Create an IBufferedCipher and use it as IWrapper (via BufferedCipherWrapper)
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IBufferedCipher blockCipher = CipherUtilities.GetCipher(algorithm);
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if (blockCipher != null)
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return new BufferedCipherWrapper(blockCipher);
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throw new SecurityUtilityException("Wrapper " + algorithm + " not recognised.");
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}
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public static string GetAlgorithmName(
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DerObjectIdentifier oid)
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{
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return (string) algorithms[oid.Id];
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}
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private class BufferedCipherWrapper
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: IWrapper
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{
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private readonly IBufferedCipher cipher;
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private bool forWrapping;
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public BufferedCipherWrapper(
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IBufferedCipher cipher)
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{
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this.cipher = cipher;
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}
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public string AlgorithmName
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{
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get { return cipher.AlgorithmName; }
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}
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public void Init(
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bool forWrapping,
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ICipherParameters parameters)
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{
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this.forWrapping = forWrapping;
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cipher.Init(forWrapping, parameters);
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}
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public byte[] Wrap(
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byte[] input,
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int inOff,
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int length)
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{
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if (!forWrapping)
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throw new InvalidOperationException("Not initialised for wrapping");
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return cipher.DoFinal(input, inOff, length);
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}
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public byte[] Unwrap(
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byte[] input,
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int inOff,
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int length)
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{
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if (forWrapping)
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throw new InvalidOperationException("Not initialised for Unwrapping");
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return cipher.DoFinal(input, inOff, length);
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}
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}
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}
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}
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