1 files changed, 64 insertions, 0 deletions
diff --git a/Crypto/src/crypto/modes/gcm/Tables64kGcmMultiplier.cs b/Crypto/src/crypto/modes/gcm/Tables64kGcmMultiplier.cs
new file mode 100644
index 000000000..f089dfe8d
--- /dev/null
+++ b/Crypto/src/crypto/modes/gcm/Tables64kGcmMultiplier.cs
@@ -0,0 +1,64 @@
+using System;
+
+using Org.BouncyCastle.Crypto.Utilities;
+
+namespace Org.BouncyCastle.Crypto.Modes.Gcm
+{
+ public class Tables64kGcmMultiplier
+ : IGcmMultiplier
+ {
+ private readonly uint[][][] M = new uint[16][][];
+
+ public void Init(byte[] H)
+ {
+ M[0] = new uint[256][];
+ M[0][0] = new uint[4];
+ M[0][128] = GcmUtilities.AsUints(H);
+ for (int j = 64; j >= 1; j >>= 1)
+ {
+ uint[] tmp = (uint[])M[0][j + j].Clone();
+ GcmUtilities.MultiplyP(tmp);
+ M[0][j] = tmp;
+ }
+ for (int i = 0;;)
+ {
+ for (int j = 2; j < 256; j += j)
+ {
+ for (int k = 1; k < j; ++k)
+ {
+ uint[] tmp = (uint[])M[i][j].Clone();
+ GcmUtilities.Xor(tmp, M[i][k]);
+ M[i][j + k] = tmp;
+ }
+ }
+
+ if (++i == 16) return;
+
+ M[i] = new uint[256][];
+ M[i][0] = new uint[4];
+ for (int j = 128; j > 0; j >>= 1)
+ {
+ uint[] tmp = (uint[])M[i - 1][j].Clone();
+ GcmUtilities.MultiplyP8(tmp);
+ M[i][j] = tmp;
+ }
+ }
+ }
+
+ public void MultiplyH(byte[] x)
+ {
+ uint[] z = new uint[4];
+ for (int i = 0; i != 16; ++i)
+ {
+ //GcmUtilities.Xor(z, M[i][x[i]]);
+ uint[] m = M[i][x[i]];
+ z[0] ^= m[0];
+ z[1] ^= m[1];
+ z[2] ^= m[2];
+ z[3] ^= m[3];
+ }
+
+ Pack.UInt32_To_BE(z, x, 0);
+ }
+ }
+}
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