PrimeGeneratorBase.cs :  » Network-Clients » SharpPrivacyLibrary » SharpPrivacy » Cipher » Math » Prime » Generator » C# / CSharp Open Source

//
// Mono.Math.Prime.Generator.PrimeGeneratorBase.cs - Abstract Prime Generator
//
// Authors:
//  Ben Maurer
//
// Copyright (c) 2003 Ben Maurer. All rights reserved
//
// Modified by Daniel Fabian to fit SharpPrivacy's needs.
// This file is part of the SharpPrivacy source code contribution.
// Get get the original BigInteger class, please visit the
// mono project at http://www.go-mono.com.

using System;

namespace SharpPrivacy.Cipher.Math.Prime.Generator{

  [CLSCompliant(false)]
  public abstract class PrimeGeneratorBase {
    private ConfidenceFactor cfConfidence = ConfidenceFactor.Medium;

    public virtual ConfidenceFactor Confidence {
      get {
        return cfConfidence;
      }
      set {
        cfConfidence = value;
      }
    }

    public virtual Prime.PrimalityTest PrimalityTest {
      get {
        return new Prime.PrimalityTest (PrimalityTests.SmallPrimeSppTest);
      }
    }

    public virtual int TrialDivisionBounds {
      get { 
        return 4000;
      }
    }

    /// <summary>
    /// Performs primality tests on bi, assumes trial division has been done.
    /// </summary>
    /// <param name="bi">A BigInteger that has been subjected to and passed trial division</param>
    /// <returns>False if bi is composite, true if it may be prime.</returns>
    /// <remarks>The speed of this method is dependent on Confidence</remarks>
    protected bool PostTrialDivisionTests (BigInteger bi) {
      return PrimalityTest (bi, this.Confidence);
    }

    public abstract BigInteger GenerateNewPrime (int bits);
  }
}