diff --git a/crypto/src/util/Bytes.cs b/crypto/src/util/Bytes.cs
index 466eba576..e808555f5 100644
--- a/crypto/src/util/Bytes.cs
+++ b/crypto/src/util/Bytes.cs
@@ -1,4 +1,7 @@
using System;
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+using System.Numerics;
+#endif
namespace Org.BouncyCastle.Utilities
{
@@ -6,5 +9,125 @@ namespace Org.BouncyCastle.Utilities
{
public const int NumBits = 8;
public const int NumBytes = 1;
+
+ public static void Xor(int len, byte[] x, byte[] y, byte[] z)
+ {
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+ Xor(len, x.AsSpan(0, len), y.AsSpan(0, len), z.AsSpan(0, len));
+#else
+ for (int i = 0; i < len; ++i)
+ {
+ z[i] = (byte)(x[i] ^ y[i]);
+ }
+#endif
+ }
+
+ public static void Xor(int len, byte[] x, int xOff, byte[] y, int yOff, byte[] z, int zOff)
+ {
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+ Xor(len, x.AsSpan(xOff, len), y.AsSpan(yOff, len), z.AsSpan(zOff, len));
+#else
+ for (int i = 0; i < len; ++i)
+ {
+ z[zOff + i] = (byte)(x[xOff + i] ^ y[yOff + i]);
+ }
+#endif
+ }
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+ public static void Xor(int len, ReadOnlySpan<byte> x, ReadOnlySpan<byte> y, Span<byte> z)
+ {
+ int i = 0;
+ if (Vector.IsHardwareAccelerated)
+ {
+ int limit = len - Vector<byte>.Count;
+ while (i <= limit)
+ {
+ var vx = new Vector<byte>(x[i..]);
+ var vy = new Vector<byte>(y[i..]);
+ (vx ^ vy).CopyTo(z[i..]);
+ i += Vector<byte>.Count;
+ }
+ }
+ {
+ int limit = len - 4;
+ while (i <= limit)
+ {
+ z[i + 0] = (byte)(x[i + 0] ^ y[i + 0]);
+ z[i + 1] = (byte)(x[i + 1] ^ y[i + 1]);
+ z[i + 2] = (byte)(x[i + 2] ^ y[i + 2]);
+ z[i + 3] = (byte)(x[i + 3] ^ y[i + 3]);
+ i += 4;
+ }
+ }
+ {
+ while (i < len)
+ {
+ z[i] = (byte)(x[i] ^ y[i]);
+ ++i;
+ }
+ }
+ }
+#endif
+
+ public static void XorTo(int len, byte[] x, byte[] z)
+ {
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+ XorTo(len, x.AsSpan(0, len), z.AsSpan(0, len));
+#else
+ for (int i = 0; i < len; ++i)
+ {
+ z[i] ^= x[i];
+ }
+#endif
+ }
+
+ public static void XorTo(int len, byte[] x, int xOff, byte[] z, int zOff)
+ {
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+ XorTo(len, x.AsSpan(xOff, len), z.AsSpan(zOff, len));
+#else
+ for (int i = 0; i < len; ++i)
+ {
+ z[zOff + i] ^= x[xOff + i];
+ }
+#endif
+ }
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+ public static void XorTo(int len, ReadOnlySpan<byte> x, Span<byte> z)
+ {
+ int i = 0;
+ if (Vector.IsHardwareAccelerated)
+ {
+ int limit = len - Vector<byte>.Count;
+ while (i <= limit)
+ {
+ var vx = new Vector<byte>(x[i..]);
+ var vz = new Vector<byte>(z[i..]);
+ (vx ^ vz).CopyTo(z[i..]);
+ i += Vector<byte>.Count;
+ }
+ }
+ {
+ int limit = len - 4;
+ while (i <= limit)
+ {
+ z[i + 0] ^= x[i + 0];
+ z[i + 1] ^= x[i + 1];
+ z[i + 2] ^= x[i + 2];
+ z[i + 3] ^= x[i + 3];
+ i += 4;
+ }
+ }
+ {
+ while (i < len)
+ {
+ z[i] ^= x[i];
+ ++i;
+ }
+ }
+ }
+#endif
}
}
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