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using System;
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
using System.Numerics;
using System.Runtime.InteropServices;
#endif
namespace Org.BouncyCastle.Utilities
{
public static class Bytes
{
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 - 8;
while (i <= limit)
{
ulong x64 = MemoryMarshal.Read<ulong>(x[i..]);
ulong y64 = MemoryMarshal.Read<ulong>(y[i..]);
ulong z64 = x64 ^ y64;
MemoryMarshal.Write(z[i..], ref z64);
i += 8;
}
}
{
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 - 8;
while (i <= limit)
{
ulong x64 = MemoryMarshal.Read<ulong>(x[i..]);
ulong z64 = MemoryMarshal.Read<ulong>(z[i..]);
z64 ^= x64;
MemoryMarshal.Write(z[i..], ref z64);
i += 8;
}
}
{
while (i < len)
{
z[i] ^= x[i];
++i;
}
}
}
#endif
}
}
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