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90 lines
2.5 KiB
90 lines
2.5 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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[BestHTTP.PlatformSupport.IL2CPP.Il2CppEagerStaticClassConstructionAttribute] |
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public sealed class Tables8kGcmMultiplier |
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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[32][]; |
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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 < 32; ++i) |
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{ |
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ulong[] t = T[i] = new ulong[32]; |
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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^3 |
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GcmUtilities.AsUlongs(this.H, t, 2); |
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GcmUtilities.MultiplyP3(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^4 |
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GcmUtilities.MultiplyP4(T[i - 1], 2, t, 2); |
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} |
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for (int n = 2; n < 16; 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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uint[] z = new uint[4]; |
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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 + i + 1], (x[i] & 0x0F) << 1); |
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// GcmUtilities.Xor(z, 0, T[i + i], (x[i] & 0xF0) >> 3); |
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//} |
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//Pack.UInt64_To_BE(z, x, 0); |
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ulong z0 = 0, z1 = 0; |
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for (int i = 15; i >= 0; --i) |
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{ |
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ulong[] tu = T[i + i + 1], tv = T[i + i]; |
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int uPos = (x[i] & 0x0F) << 1, vPos = (x[i] & 0xF0) >> 3; |
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z0 ^= tu[uPos + 0] ^ tv[vPos + 0]; |
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z1 ^= tu[uPos + 1] ^ tv[vPos + 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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