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85 lines
2.2 KiB
85 lines
2.2 KiB
#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 ulong[][] T; |
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public void Init(byte[] H) |
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{ |
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if (T == null) |
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{ |
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T = new ulong[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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for (int i = 0; i < 16; ++i) |
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{ |
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ulong[] t = T[i] = new ulong[512]; |
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// t[0] = 0 |
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if (i == 0) |
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{ |
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// t[1] = H.p^7 |
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GcmUtilities.AsUlongs(this.H, t, 2); |
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GcmUtilities.MultiplyP7(t, 2, t, 2); |
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} |
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else |
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{ |
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// t[1] = T[i-1][1].p^8 |
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GcmUtilities.MultiplyP8(T[i - 1], 2, t, 2); |
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} |
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for (int n = 2; n < 256; n += 2) |
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{ |
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// t[2.n] = t[n].p^-1 |
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GcmUtilities.DivideP(t, n, t, n << 1); |
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// t[2.n + 1] = t[2.n] + t[1] |
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GcmUtilities.Xor(t, n << 1, t, 2, t, (n + 1) << 1); |
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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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//ulong[] z = new ulong[2]; |
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//for (int i = 15; i >= 0; --i) |
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//{ |
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// GcmUtilities.Xor(z, 0, T[i], x[i] << 1); |
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//} |
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//Pack.UInt64_To_BE(z, x, 0); |
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ulong[] t = T[15]; |
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int tPos = x[15] << 1; |
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ulong z0 = t[tPos + 0], z1 = t[tPos + 1]; |
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for (int i = 14; i >= 0; --i) |
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{ |
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t = T[i]; |
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tPos = x[i] << 1; |
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z0 ^= t[tPos + 0]; |
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z1 ^= t[tPos + 1]; |
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} |
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Pack.UInt64_To_BE(z0, x, 0); |
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Pack.UInt64_To_BE(z1, x, 8); |
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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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