82 lines
2.2 KiB
C#
82 lines
2.2 KiB
C#
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Utilities;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Modes.Gcm
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{
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public class Tables64kGcmMultiplier
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: IGcmMultiplier
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{
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private byte[] H;
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private uint[][][] M;
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public void Init(byte[] H)
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{
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if (M == null)
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{
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M = new uint[16][][];
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}
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else if (Arrays.AreEqual(this.H, H))
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{
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return;
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}
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this.H = Arrays.Clone(H);
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M[0] = new uint[256][];
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M[0][0] = new uint[4];
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M[0][128] = GcmUtilities.AsUints(H);
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for (int j = 64; j >= 1; j >>= 1)
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{
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uint[] tmp = (uint[])M[0][j + j].Clone();
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GcmUtilities.MultiplyP(tmp);
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M[0][j] = tmp;
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}
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for (int i = 0; ; )
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{
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for (int j = 2; j < 256; j += j)
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{
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for (int k = 1; k < j; ++k)
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{
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uint[] tmp = (uint[])M[i][j].Clone();
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GcmUtilities.Xor(tmp, M[i][k]);
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M[i][j + k] = tmp;
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}
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}
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if (++i == 16) return;
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M[i] = new uint[256][];
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M[i][0] = new uint[4];
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for (int j = 128; j > 0; j >>= 1)
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{
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uint[] tmp = (uint[])M[i - 1][j].Clone();
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GcmUtilities.MultiplyP8(tmp);
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M[i][j] = tmp;
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}
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}
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}
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public void MultiplyH(byte[] x)
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{
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uint[] z = new uint[4];
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for (int i = 0; i != 16; ++i)
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{
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//GcmUtilities.Xor(z, M[i][x[i]]);
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uint[] m = M[i][x[i]];
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z[0] ^= m[0];
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z[1] ^= m[1];
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z[2] ^= m[2];
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z[3] ^= m[3];
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}
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Pack.UInt32_To_BE(z, x, 0);
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}
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}
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}
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#pragma warning restore
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#endif
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