ML_Common.cs

using System;
using System.Security.Cryptography;
 
namespace Waher.Security.PQC
{
    public abstract class ML_Common
    {
        private static readonly RandomNumberGenerator rnd = RandomNumberGenerator.Create();
 
        public abstract int PublicKeyLength { get; }
 
        public abstract int PrivateKeyLength { get; }
 
        protected static byte[] CreateSeed(int NrBytes)
        {
            byte[] Seed = new byte[NrBytes];
 
            lock (rnd)
            {
                rnd.GetBytes(Seed);
            }
 
            return Seed;
        }
 
        protected static byte[] CreateSeed()
        {
            return CreateSeed(32);
        }
 
        protected static void Clear(byte[] Bin)
        {
            Array.Clear(Bin, 0, Bin.Length);
        }
 
        protected static void Clear<T>(T[] f)
        {
            Array.Clear(f, 0, f.Length);
        }
 
        protected static void Clear<T>(T[][] v)
        {
            int i, c = v.Length;
 
            for (i = 0; i < c; i++)
                Clear(v[i]);
        }
 
        protected static readonly ushort[] ushortBitMask =
        {
            0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F, 0x003F, 0x007F,
            0x00FF, 0x01FF, 0x03FF, 0x07FF, 0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF,
            0xFFFF
        };
 
        protected static readonly int[] intBitMask =
        {
            0x00000000, 0x00000001, 0x00000003, 0x00000007, 
            0x0000000F, 0x0000001F, 0x0000003F, 0x0000007F,
            0x000000FF, 0x000001FF, 0x000003FF, 0x000007FF,
            0x00000FFF, 0x00001FFF, 0x00003FFF, 0x00007FFF,
            0x0000FFFF, 0x0001FFFF, 0x0003FFFF, 0x0007FFFF,
            0x000FFFFF, 0x001FFFFF, 0x003FFFFF, 0x007FFFFF,
            0x00FFFFFF, 0x01FFFFFF, 0x03FFFFFF, 0x07FFFFFF,
            0x0FFFFFFF, 0x1FFFFFFF, 0x3FFFFFFF, 0x7FFFFFFF
        };
 
    }
}