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using System;
using System.Collections.Generic;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.X9;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Security;
namespace Org.BouncyCastle.Crypto.Parameters
{
public abstract class ECKeyParameters
: AsymmetricKeyParameter
{
// NB: Use a Dictionary so we can lookup the upper case version
private static readonly Dictionary<string, string> Algorithms =
new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
{
{ "EC", "EC" },
{ "ECDSA", "ECDSA" },
{ "ECDH", "ECDH" },
{ "ECDHC", "ECDHC" },
{ "ECGOST3410", "ECGOST3410" },
{ "ECMQV", "ECMQV" },
};
private readonly string algorithm;
private readonly ECDomainParameters parameters;
private readonly DerObjectIdentifier publicKeyParamSet;
protected ECKeyParameters(
string algorithm,
bool isPrivate,
ECDomainParameters parameters)
: base(isPrivate)
{
if (algorithm == null)
throw new ArgumentNullException("algorithm");
if (parameters == null)
throw new ArgumentNullException("parameters");
this.algorithm = VerifyAlgorithmName(algorithm);
this.parameters = parameters;
}
protected ECKeyParameters(
string algorithm,
bool isPrivate,
DerObjectIdentifier publicKeyParamSet)
: base(isPrivate)
{
if (algorithm == null)
throw new ArgumentNullException("algorithm");
if (publicKeyParamSet == null)
throw new ArgumentNullException("publicKeyParamSet");
this.algorithm = VerifyAlgorithmName(algorithm);
this.parameters = LookupParameters(publicKeyParamSet);
this.publicKeyParamSet = publicKeyParamSet;
}
public string AlgorithmName
{
get { return algorithm; }
}
public ECDomainParameters Parameters
{
get { return parameters; }
}
public DerObjectIdentifier PublicKeyParamSet
{
get { return publicKeyParamSet; }
}
public override bool Equals(
object obj)
{
if (obj == this)
return true;
ECDomainParameters other = obj as ECDomainParameters;
if (other == null)
return false;
return Equals(other);
}
protected bool Equals(
ECKeyParameters other)
{
return parameters.Equals(other.parameters) && base.Equals(other);
}
public override int GetHashCode()
{
return parameters.GetHashCode() ^ base.GetHashCode();
}
internal ECKeyGenerationParameters CreateKeyGenerationParameters(
SecureRandom random)
{
if (publicKeyParamSet != null)
{
return new ECKeyGenerationParameters(publicKeyParamSet, random);
}
return new ECKeyGenerationParameters(parameters, random);
}
internal static string VerifyAlgorithmName(string algorithm)
{
if (!Algorithms.TryGetValue(algorithm, out var upper))
throw new ArgumentException("unrecognised algorithm: " + algorithm, nameof(algorithm));
return upper;
}
internal static ECDomainParameters LookupParameters(
DerObjectIdentifier publicKeyParamSet)
{
if (publicKeyParamSet == null)
throw new ArgumentNullException("publicKeyParamSet");
X9ECParameters x9 = ECKeyPairGenerator.FindECCurveByOid(publicKeyParamSet);
if (x9 == null)
throw new ArgumentException("OID is not a valid public key parameter set", "publicKeyParamSet");
return new ECDomainParameters(x9);
}
}
}
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