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#if NETCOREAPP3_0_OR_GREATER
using System;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Runtime.Intrinsics;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Digests;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Pqc.Crypto.SphincsPlus
{
internal class HarakaS_X86
: IXof
{
public static bool IsSupported => Haraka512_X86.IsSupported;
private enum State { Absorbing, Squeezing };
private readonly Vector128<byte>[] m_roundConstants = new Vector128<byte>[40];
private readonly byte[] m_buf = new byte[64];
private int m_bufPos = 0;
private State m_state = State.Absorbing;
internal HarakaS_X86(ReadOnlySpan<byte> pkSeed)
{
if (!IsSupported)
throw new PlatformNotSupportedException(nameof(HarakaS_X86));
// Absorb PKSeed
Span<byte> buf = stackalloc byte[64];
while (pkSeed.Length >= 32)
{
XorWith(pkSeed[..32], buf);
Haraka512_X86.Permute(buf, buf);
pkSeed = pkSeed[32..];
}
XorWith(pkSeed, buf);
buf[pkSeed.Length] ^= 0x1F;
buf[ 31] ^= 0x80;
// Squeeze round constants
int rc = 0;
while (rc < 40)
{
Haraka512_X86.Permute(buf, buf);
m_roundConstants[rc++] = Load128(buf[ ..16]);
m_roundConstants[rc++] = Load128(buf[16..32]);
}
}
internal ReadOnlySpan<Vector128<byte>> RoundConstants => m_roundConstants;
public string AlgorithmName => "HarakaS";
public int GetDigestSize() => 32;
public int GetByteLength() => 32;
public void Update(byte input)
{
if (m_state != State.Absorbing)
throw new InvalidOperationException();
m_buf[m_bufPos++] ^= input;
if (m_bufPos == 32)
{
Haraka512_X86.Permute(m_buf, m_buf, m_roundConstants);
m_bufPos = 0;
}
}
public void BlockUpdate(byte[] input, int inOff, int inLen)
{
BlockUpdate(input.AsSpan(inOff, inLen));
}
public void BlockUpdate(ReadOnlySpan<byte> input)
{
if (m_state != State.Absorbing)
throw new InvalidOperationException();
int available = 32 - m_bufPos;
if (input.Length < available)
{
XorWith(input, m_buf.AsSpan(m_bufPos));
m_bufPos += input.Length;
return;
}
XorWith(input[..available], m_buf.AsSpan(m_bufPos));
input = input[available..];
Haraka512_X86.Permute(m_buf, m_buf, m_roundConstants);
while (input.Length >= 32)
{
XorWith(input[..32], m_buf);
input = input[32..];
Haraka512_X86.Permute(m_buf, m_buf, m_roundConstants);
}
XorWith(input, m_buf);
m_bufPos = input.Length;
}
public int DoFinal(byte[] output, int outOff)
{
return OutputFinal(output.AsSpan(outOff, 32));
}
public int DoFinal(Span<byte> output)
{
return OutputFinal(output[..32]);
}
public int Output(byte[] output, int outOff, int outLen)
{
return Output(output.AsSpan(outOff, outLen));
}
public int Output(Span<byte> output)
{
int result = output.Length;
if (m_state != State.Squeezing)
{
m_buf[m_bufPos] ^= 0x1F;
m_buf[31] ^= 0x80;
m_bufPos = 32;
m_state = State.Squeezing;
if (output.IsEmpty)
return result;
}
else
{
int available = 32 - m_bufPos;
if (output.Length <= available)
{
output.CopyFrom(m_buf.AsSpan(m_bufPos));
m_bufPos += available;
return result;
}
output[..available].CopyFrom(m_buf.AsSpan(m_bufPos));
output = output[available..];
}
Debug.Assert(!output.IsEmpty);
while (output.Length > 32)
{
Haraka512_X86.Permute(m_buf, m_buf, m_roundConstants);
output[..32].CopyFrom(m_buf);
output = output[32..];
}
Haraka512_X86.Permute(m_buf, m_buf, m_roundConstants);
output.CopyFrom(m_buf);
m_bufPos = output.Length;
return result;
}
public int OutputFinal(byte[] output, int outOff, int outLen)
{
return OutputFinal(output.AsSpan(outOff, outLen));
}
public int OutputFinal(Span<byte> output)
{
int result = Output(output);
Reset();
return result;
}
public void Reset()
{
Array.Clear(m_buf);
m_bufPos = 0;
m_state = State.Absorbing;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static Vector128<byte> Load128(ReadOnlySpan<byte> t)
{
#if NET7_0_OR_GREATER
return Vector128.Create<byte>(t);
#else
if (BitConverter.IsLittleEndian && Unsafe.SizeOf<Vector128<byte>>() == 16)
return Unsafe.ReadUnaligned<Vector128<byte>>(ref Unsafe.AsRef(t[0]));
return Vector128.Create(t[0], t[1], t[2], t[3], t[4], t[5], t[6], t[7], t[8], t[9], t[10], t[11], t[12],
t[13], t[14], t[15]);
#endif
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static void XorWith(ReadOnlySpan<byte> x, Span<byte> z)
{
for (int i = 0; i < x.Length; i++)
{
z[i] ^= x[i];
}
}
}
}
#endif
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