77 lines
1.7 KiB
C#
77 lines
1.7 KiB
C#
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/*
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* Secucore
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*
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* Copyright (C) 2023 Trevor Hall
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* All rights reserved.
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*
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* This software may be modified and distributed under the terms
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* of the MIT license.
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*
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*/
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using System;
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namespace SecuCore.Security
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{
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class SecRNG
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{
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private RStep stepper;
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public SecRNG()
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{
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uint seed = BitConverter.ToUInt32(Guid.NewGuid().ToByteArray());
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stepper = new RStep(seed);
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}
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public void GetRandomBytes(byte[] target, int offset, int length)
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{
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int ceil = offset + length - 1;
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int i = offset;
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while(i <= ceil)
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{
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uint nu = stepper.Next32();
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if (i > ceil) break;
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target[i++] = (byte)((nu >> 24) & 0xff);
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if (i > ceil) break;
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target[i++] = (byte)((nu >> 16) & 0xff);
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if (i > ceil) break;
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target[i++] = (byte)((nu >> 8) & 0xff);
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if (i > ceil) break;
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target[i++] = (byte)((nu) & 0xff);
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}
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}
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}
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public struct RStep
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{
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const uint iY = 842502087, iZ = 3579807591, iW = 273326509;
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uint x;
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uint y;
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uint z;
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uint w;
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uint next;
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public RStep(uint seed)
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{
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x = seed;
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y = iY;
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z = iZ;
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w = iW;
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next = 0;
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Step();
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}
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public void Step()
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{
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uint t = (x ^ (x << 11));
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x = y;
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y = z;
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z = w;
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next = (w = (w ^ (w >> 19)) ^ (t ^ (t >> 8)));
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}
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public uint Next32()
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{
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Step();
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return next;
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}
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}
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}
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