64 lines
1.7 KiB
C#
64 lines
1.7 KiB
C#
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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using System;
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using System.Collections;
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using Org.BouncyCastle.Utilities;
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namespace Org.BouncyCastle.Crypto.Modes.Gcm
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{
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public class Tables1kGcmExponentiator
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: IGcmExponentiator
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{
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// A lookup table of the power-of-two powers of 'x'
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// - lookupPowX2[i] = x^(2^i)
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private IList lookupPowX2;
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public void Init(byte[] x)
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{
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uint[] y = GcmUtilities.AsUints(x);
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if (lookupPowX2 != null && Arrays.AreEqual(y, (uint[])lookupPowX2[0]))
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return;
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lookupPowX2 = Platform.CreateArrayList(8);
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lookupPowX2.Add(y);
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}
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public void ExponentiateX(long pow, byte[] output)
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{
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uint[] y = GcmUtilities.OneAsUints();
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int bit = 0;
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while (pow > 0)
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{
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if ((pow & 1L) != 0)
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{
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EnsureAvailable(bit);
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GcmUtilities.Multiply(y, (uint[])lookupPowX2[bit]);
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}
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++bit;
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pow >>= 1;
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}
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GcmUtilities.AsBytes(y, output);
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}
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private void EnsureAvailable(int bit)
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{
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int count = lookupPowX2.Count;
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if (count <= bit)
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{
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uint[] tmp = (uint[])lookupPowX2[count - 1];
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do
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{
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tmp = Arrays.Clone(tmp);
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GcmUtilities.Multiply(tmp, tmp);
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lookupPowX2.Add(tmp);
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}
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while (++count <= bit);
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}
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}
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}
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}
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#endif
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