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using System;
using System.Collections.Generic;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.EdEC;
using Org.BouncyCastle.Asn1.X9;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Agreement;
using Org.BouncyCastle.Crypto.Agreement.Kdf;
using Org.BouncyCastle.Crypto.Digests;
using Org.BouncyCastle.Utilities.Collections;
namespace Org.BouncyCastle.Security
{
/// <remarks>
/// Utility class for creating IBasicAgreement objects from their names/Oids
/// </remarks>
public static class AgreementUtilities
{
private static readonly IDictionary<string, string> Algorithms =
new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
static AgreementUtilities()
{
Algorithms[X9ObjectIdentifiers.DHSinglePassCofactorDHSha1KdfScheme.Id] = "ECCDHWITHSHA1KDF";
Algorithms[X9ObjectIdentifiers.DHSinglePassStdDHSha1KdfScheme.Id] = "ECDHWITHSHA1KDF";
Algorithms[X9ObjectIdentifiers.MqvSinglePassSha1KdfScheme.Id] = "ECMQVWITHSHA1KDF";
Algorithms[EdECObjectIdentifiers.id_X25519.Id] = "X25519";
Algorithms[EdECObjectIdentifiers.id_X448.Id] = "X448";
}
public static IBasicAgreement GetBasicAgreement(
DerObjectIdentifier oid)
{
return GetBasicAgreement(oid.Id);
}
public static IBasicAgreement GetBasicAgreement(
string algorithm)
{
string mechanism = GetMechanism(algorithm);
if (mechanism == "DH" || mechanism == "DIFFIEHELLMAN")
return new DHBasicAgreement();
if (mechanism == "ECDH")
return new ECDHBasicAgreement();
if (mechanism == "ECDHC" || mechanism == "ECCDH")
return new ECDHCBasicAgreement();
if (mechanism == "ECMQV")
return new ECMqvBasicAgreement();
throw new SecurityUtilityException("Basic Agreement " + algorithm + " not recognised.");
}
public static IBasicAgreement GetBasicAgreementWithKdf(DerObjectIdentifier agreeAlgOid,
DerObjectIdentifier wrapAlgOid)
{
return GetBasicAgreementWithKdf(agreeAlgOid.Id, wrapAlgOid.Id);
}
public static IBasicAgreement GetBasicAgreementWithKdf(DerObjectIdentifier oid, string wrapAlgorithm)
{
return GetBasicAgreementWithKdf(oid.Id, wrapAlgorithm);
}
public static IBasicAgreement GetBasicAgreementWithKdf(string agreeAlgorithm, string wrapAlgorithm)
{
string mechanism = GetMechanism(agreeAlgorithm);
// 'DHWITHSHA1KDF' retained for backward compatibility
if (mechanism == "DHWITHSHA1KDF" || mechanism == "ECDHWITHSHA1KDF")
return new ECDHWithKdfBasicAgreement(wrapAlgorithm, new ECDHKekGenerator(new Sha1Digest()));
if (mechanism == "ECCDHWITHSHA1KDF")
return new ECDHCWithKdfBasicAgreement(wrapAlgorithm, new ECDHKekGenerator(new Sha1Digest()));
if (mechanism == "ECMQVWITHSHA1KDF")
return new ECMqvWithKdfBasicAgreement(wrapAlgorithm, new ECDHKekGenerator(new Sha1Digest()));
throw new SecurityUtilityException("Basic Agreement (with KDF) " + agreeAlgorithm + " not recognised.");
}
public static IRawAgreement GetRawAgreement(
DerObjectIdentifier oid)
{
return GetRawAgreement(oid.Id);
}
public static IRawAgreement GetRawAgreement(string algorithm)
{
string mechanism = GetMechanism(algorithm);
if (mechanism == "X25519")
return new X25519Agreement();
if (mechanism == "X448")
return new X448Agreement();
throw new SecurityUtilityException("Raw Agreement " + algorithm + " not recognised.");
}
public static string GetAlgorithmName(DerObjectIdentifier oid)
{
return CollectionUtilities.GetValueOrNull(Algorithms, oid.Id);
}
private static string GetMechanism(string algorithm)
{
var mechanism = CollectionUtilities.GetValueOrKey(Algorithms, algorithm);
return mechanism.ToUpperInvariant();
}
}
}
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