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74 lines
2.0 KiB
74 lines
2.0 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 Tables4kGcmMultiplier |
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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[512]; |
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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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// T[0] = 0 |
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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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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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public void MultiplyH(byte[] x) |
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{ |
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//ulong[] z = new ulong[2]; |
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//GcmUtilities.Copy(T, x[15] << 1, z, 0); |
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//for (int i = 14; i >= 0; --i) |
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//{ |
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// GcmUtilities.MultiplyP8(z); |
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// GcmUtilities.Xor(z, 0, T, x[i] << 1); |
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//} |
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//Pack.UInt64_To_BE(z, x, 0); |
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int pos = x[15] << 1; |
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ulong z0 = T[pos + 0], z1 = T[pos + 1]; |
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for (int i = 14; i >= 0; --i) |
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{ |
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pos = x[i] << 1; |
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ulong c = z1 << 56; |
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z1 = T[pos + 1] ^ ((z1 >> 8) | (z0 << 56)); |
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z0 = T[pos + 0] ^ (z0 >> 8) ^ c ^ (c >> 1) ^ (c >> 2) ^ (c >> 7); |
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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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