122 lines
2.7 KiB
C#
122 lines
2.7 KiB
C#
using System;
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using System.Globalization;
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using Org.BouncyCastle.Asn1;
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using Org.BouncyCastle.Asn1.CryptoPro;
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namespace Org.BouncyCastle.Crypto.Parameters
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{
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public abstract class ECKeyParameters
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: AsymmetricKeyParameter
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{
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private readonly string algorithm;
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private readonly ECDomainParameters parameters;
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private readonly DerObjectIdentifier publicKeyParamSet;
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protected ECKeyParameters(
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string algorithm,
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bool isPrivate,
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ECDomainParameters parameters)
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: base(isPrivate)
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{
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if (algorithm == null)
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throw new ArgumentNullException("algorithm");
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if (parameters == null)
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throw new ArgumentNullException("parameters");
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this.algorithm = VerifyAlgorithmName(algorithm);
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this.parameters = parameters;
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}
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protected ECKeyParameters(
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string algorithm,
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bool isPrivate,
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DerObjectIdentifier publicKeyParamSet)
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: base(isPrivate)
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{
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if (algorithm == null)
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throw new ArgumentNullException("algorithm");
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if (publicKeyParamSet == null)
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throw new ArgumentNullException("publicKeyParamSet");
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this.algorithm = VerifyAlgorithmName(algorithm);
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this.parameters = LookupParameters(publicKeyParamSet);
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this.publicKeyParamSet = publicKeyParamSet;
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}
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public string AlgorithmName
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{
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get { return algorithm; }
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}
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public ECDomainParameters Parameters
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{
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get { return parameters; }
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}
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public DerObjectIdentifier PublicKeyParamSet
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{
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get { return publicKeyParamSet; }
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}
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public override bool Equals(
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object obj)
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{
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if (obj == this)
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return true;
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ECDomainParameters other = obj as ECDomainParameters;
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if (other == null)
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return false;
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return Equals(other);
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}
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protected bool Equals(
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ECKeyParameters other)
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{
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return parameters.Equals(other.parameters) && base.Equals(other);
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}
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public override int GetHashCode()
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{
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return parameters.GetHashCode() ^ base.GetHashCode();
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}
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private string VerifyAlgorithmName(
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string algorithm)
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{
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string upper = algorithm.ToUpper(CultureInfo.InvariantCulture);
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switch (upper)
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{
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case "EC":
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case "ECDSA":
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case "ECGOST3410":
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case "ECDH":
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case "ECDHC":
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break;
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default:
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throw new ArgumentException("unrecognised algorithm: " + algorithm, "algorithm");
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}
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return upper;
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}
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private static ECDomainParameters LookupParameters(
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DerObjectIdentifier publicKeyParamSet)
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{
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if (publicKeyParamSet == null)
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throw new ArgumentNullException("publicKeyParamSet");
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ECDomainParameters p = ECGost3410NamedCurves.GetByOid(publicKeyParamSet);
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if (p == null)
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throw new ArgumentException("OID is not a valid CryptoPro public key parameter set", "publicKeyParamSet");
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return p;
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}
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}
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}
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