145 lines
5.3 KiB
C#
145 lines
5.3 KiB
C#
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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using System.Collections.Generic;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.Kisa;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.Nist;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.Ntt;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.Pkcs;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Engines;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities.Collections;
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namespace BestHTTP.SecureProtocol.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 static class WrapperUtilities
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{
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private enum WrapAlgorithm { AESWRAP, CAMELLIAWRAP, DESEDEWRAP, RC2WRAP, SEEDWRAP,
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DESEDERFC3211WRAP, AESRFC3211WRAP, CAMELLIARFC3211WRAP };
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private static readonly IDictionary<string, string> Algorithms =
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new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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static WrapperUtilities()
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{
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// Signal to obfuscation tools not to change enum constants
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Enums.GetArbitraryValue<WrapAlgorithm>().ToString();
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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["TDEAWRAP"] = "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(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(string algorithm)
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{
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string mechanism = CollectionUtilities.GetValueOrKey(Algorithms, algorithm).ToUpperInvariant();
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try
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{
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WrapAlgorithm wrapAlgorithm = Enums.GetEnumValue<WrapAlgorithm>(mechanism);
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switch (wrapAlgorithm)
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{
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case WrapAlgorithm.AESWRAP: return new AesWrapEngine();
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case WrapAlgorithm.CAMELLIAWRAP: return new CamelliaWrapEngine();
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case WrapAlgorithm.DESEDEWRAP: return new DesEdeWrapEngine();
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case WrapAlgorithm.RC2WRAP: return new RC2WrapEngine();
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case WrapAlgorithm.SEEDWRAP: return new SeedWrapEngine();
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case WrapAlgorithm.DESEDERFC3211WRAP: return new Rfc3211WrapEngine(new DesEdeEngine());
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case WrapAlgorithm.AESRFC3211WRAP: return new Rfc3211WrapEngine(AesUtilities.CreateEngine());
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case WrapAlgorithm.CAMELLIARFC3211WRAP: return new Rfc3211WrapEngine(new CamelliaEngine());
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}
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}
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catch (ArgumentException)
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{
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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(DerObjectIdentifier oid)
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{
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return CollectionUtilities.GetValueOrNull(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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#pragma warning restore
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#endif
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