GOST3410KeyGenerationParameters.cs :  » PDF » iTextSharp » Org » BouncyCastle » Crypto » Parameters » C# / CSharp Open Source

using System;

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.CryptoPro;
using Org.BouncyCastle.Security;

namespace Org.BouncyCastle.Crypto.Parameters{
  public class Gost3410KeyGenerationParameters
    : KeyGenerationParameters
  {
    private readonly Gost3410Parameters parameters;
    private readonly DerObjectIdentifier publicKeyParamSet;

    public Gost3410KeyGenerationParameters(
      SecureRandom random,
      Gost3410Parameters parameters)
      : base(random, parameters.P.BitLength - 1)
    {
      this.parameters = parameters;
    }

    public Gost3410KeyGenerationParameters(
      SecureRandom    random,
      DerObjectIdentifier  publicKeyParamSet)
      : this(random, LookupParameters(publicKeyParamSet))
    {
      this.publicKeyParamSet = publicKeyParamSet;
    }

    public Gost3410Parameters Parameters
    {
      get { return parameters; }
    }

    public DerObjectIdentifier PublicKeyParamSet
    {
      get { return publicKeyParamSet; }
    }

    private static Gost3410Parameters LookupParameters(
      DerObjectIdentifier publicKeyParamSet)
    {
      if (publicKeyParamSet == null)
        throw new ArgumentNullException("publicKeyParamSet");

      Gost3410ParamSetParameters p = Gost3410NamedParameters.GetByOid(publicKeyParamSet);

      if (p == null)
        throw new ArgumentException("OID is not a valid CryptoPro public key parameter set", "publicKeyParamSet");

      return new Gost3410Parameters(p.P, p.Q, p.A);
    }
  }
}