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Packages/com.tivadar.best.http/Runtime/Shared/TLS/Crypto/Impl/FastSalsa20EngineHelper.cs

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+#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
+using System;
+
+#if BESTHTTP_WITH_BURST
+using Unity.Burst.Intrinsics;
+using static Unity.Burst.Intrinsics.X86;
+using static Unity.Burst.Intrinsics.Arm;
+#endif
+
+namespace Best.HTTP.Shared.TLS.Crypto.Impl
+{
+#if BESTHTTP_WITH_BURST
+    [Unity.Burst.BurstCompile]
+#endif
+    internal static class FastSalsa20EngineHelper
+    {
+#if BESTHTTP_WITH_BURST
+        [Unity.Burst.BurstCompile]
+        public unsafe static void ProcessBytes([Unity.Burst.NoAlias] byte* outBytes, int outOff, [Unity.Burst.NoAlias] byte* inBytes, int inOff, [Unity.Burst.NoAlias] byte* keyStream)
+        {
+            //for (int i = 0; i < 64; ++i)
+            //    outBytes[idx + i + outOff] = (byte)(keyStream[i] ^ inBytes[idx + i + inOff]);
+
+#if !UNITY_ANDROID && !UNITY_IOS
+            if (Sse2.IsSse2Supported)
+            {
+                for (int offset = 0; offset < 64; offset += 16)
+                {
+                    var vin = Sse2.loadu_si128(inBytes + inOff + offset);
+                    //var vout = Sse2.loadu_si128(outBytes + outOff + offset);
+                    var vkeyStream = Sse2.loadu_si128(keyStream + offset);
+
+                    var vout = Sse2.xor_si128(vkeyStream, vin);
+
+                    Sse2.storeu_si128(outBytes + outOff + offset, vout);
+                }
+            }
+            else 
+#endif
+            if (Neon.IsNeonSupported)
+            {
+                for (int offset = 0; offset < 64; offset += 16)
+                {
+                    var vin = Neon.vld1q_u8(inBytes + inOff + offset);
+                    var vkeyStream = Neon.vld1q_u8(keyStream + offset);
+
+                    var vOut = Neon.veorq_u8(vkeyStream, vin);
+
+                    Neon.vst1q_u8(outBytes + outOff + offset, vOut);
+                }
+            }
+            else
+            {
+                ulong* pulOut = (ulong*)&outBytes[outOff];
+                ulong* pulIn = (ulong*)&inBytes[inOff];
+                ulong* pulKeyStream = (ulong*)keyStream;
+
+                pulOut[0] = pulKeyStream[0] ^ pulIn[0];
+                pulOut[1] = pulKeyStream[1] ^ pulIn[1];
+                pulOut[2] = pulKeyStream[2] ^ pulIn[2];
+                pulOut[3] = pulKeyStream[3] ^ pulIn[3];
+            }
+        }
+#endif
+
+        }
+    }
+#endif