mcs/class/Mono.Security/Mono.Math.Prime.Generator/PrimeGeneratorBase.cs

   1 //
   2 // Mono.Math.Prime.Generator.PrimeGeneratorBase.cs - Abstract Prime Generator
   3 //
   4 // Authors:
   5 //      Ben Maurer
   6 //
   7 // Copyright (c) 2003 Ben Maurer. All rights reserved
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32
  33 namespace Mono.Math.Prime.Generator {
  34
  35 #if INSIDE_CORLIB
  36         internal
  37 #else
  38         public
  39 #endif
  40         abstract class PrimeGeneratorBase {
  41
  42                 public virtual ConfidenceFactor Confidence {
  43                         get {
  44 #if DEBUG
  45                                 return ConfidenceFactor.ExtraLow;
  46 #else
  47                                 return ConfidenceFactor.Medium;
  48 #endif
  49                         }
  50                 }
  51
  52                 public virtual Prime.PrimalityTest PrimalityTest {
  53                         get {
  54                                 return new Prime.PrimalityTest (PrimalityTests.RabinMillerTest);
  55                         }
  56                 }
  57
  58                 public virtual int TrialDivisionBounds {
  59                         get { return 4000; }
  60                 }
  61
  62                 /// <summary>
  63                 /// Performs primality tests on bi, assumes trial division has been done.
  64                 /// </summary>
  65                 /// <param name="bi">A BigInteger that has been subjected to and passed trial division</param>
  66                 /// <returns>False if bi is composite, true if it may be prime.</returns>
  67                 /// <remarks>The speed of this method is dependent on Confidence</remarks>
  68                 protected bool PostTrialDivisionTests (BigInteger bi)
  69                 {
  70                         return PrimalityTest (bi, this.Confidence);
  71                 }
  72
  73                 public abstract BigInteger GenerateNewPrime (int bits);
  74         }
  75 }