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using System;
namespace Org.BouncyCastle.Crypto.Digests
{
public sealed class Haraka256Digest
: HarakaBase
{
private readonly byte[] m_buf;
private int m_bufPos;
public Haraka256Digest()
{
m_buf = new byte[32];
m_bufPos = 0;
}
public override string AlgorithmName => "Haraka-256";
public override int GetByteLength() => 32;
public override void Update(byte input)
{
if (m_bufPos > 32 - 1)
throw new ArgumentException("total input cannot be more than 32 bytes");
m_buf[m_bufPos++] = input;
}
public override void BlockUpdate(byte[] input, int inOff, int len)
{
if (m_bufPos > 32 - len)
throw new ArgumentException("total input cannot be more than 32 bytes");
Array.Copy(input, inOff, m_buf, m_bufPos, len);
m_bufPos += len;
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public override void BlockUpdate(ReadOnlySpan<byte> input)
{
if (m_bufPos > 32 - input.Length)
throw new ArgumentException("total input cannot be more than 32 bytes");
input.CopyTo(m_buf.AsSpan(m_bufPos));
m_bufPos += input.Length;
}
#endif
public override int DoFinal(byte[] output, int outOff)
{
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
return DoFinal(output.AsSpan(outOff));
#else
if (m_bufPos != 32)
throw new ArgumentException("input must be exactly 32 bytes");
if (output.Length - outOff < 32)
throw new ArgumentException("output too short to receive digest");
int rv = Haraka256256(m_buf, output, outOff);
Reset();
return rv;
#endif
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public override int DoFinal(Span<byte> output)
{
if (m_bufPos != 32)
throw new ArgumentException("input must be exactly 32 bytes");
if (output.Length < 32)
throw new ArgumentException("output too short to receive digest");
#if NETCOREAPP3_0_OR_GREATER
if (Haraka256_X86.IsSupported)
{
Haraka256_X86.Hash(m_buf, output);
Reset();
return 32;
}
#endif
int rv = Haraka256256(m_buf, output);
Reset();
return rv;
}
#endif
public override void Reset()
{
m_bufPos = 0;
Array.Clear(m_buf, 0, 32);
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
private static int Haraka256256(ReadOnlySpan<byte> msg, Span<byte> output)
{
byte[][] s1 = new byte[2][];
s1[0] = new byte[16];
s1[1] = new byte[16];
byte[][] s2 = new byte[2][];
s2[0] = new byte[16];
s2[1] = new byte[16];
msg[ ..16].CopyTo(s1[0]);
msg[16..32].CopyTo(s1[1]);
s1[0] = AesEnc(s1[0], RC[0]);
s1[1] = AesEnc(s1[1], RC[1]);
s1[0] = AesEnc(s1[0], RC[2]);
s1[1] = AesEnc(s1[1], RC[3]);
Mix256(s1, s2);
s1[0] = AesEnc(s2[0], RC[4]);
s1[1] = AesEnc(s2[1], RC[5]);
s1[0] = AesEnc(s1[0], RC[6]);
s1[1] = AesEnc(s1[1], RC[7]);
Mix256(s1, s2);
s1[0] = AesEnc(s2[0], RC[8]);
s1[1] = AesEnc(s2[1], RC[9]);
s1[0] = AesEnc(s1[0], RC[10]);
s1[1] = AesEnc(s1[1], RC[11]);
Mix256(s1, s2);
s1[0] = AesEnc(s2[0], RC[12]);
s1[1] = AesEnc(s2[1], RC[13]);
s1[0] = AesEnc(s1[0], RC[14]);
s1[1] = AesEnc(s1[1], RC[15]);
Mix256(s1, s2);
s1[0] = AesEnc(s2[0], RC[16]);
s1[1] = AesEnc(s2[1], RC[17]);
s1[0] = AesEnc(s1[0], RC[18]);
s1[1] = AesEnc(s1[1], RC[19]);
Mix256(s1, s2);
Xor(s2[0], msg , output[ ..16]);
Xor(s2[1], msg[16..], output[16..32]);
return DIGEST_SIZE;
}
#else
private static int Haraka256256(byte[] msg, byte[] output, int outOff)
{
byte[][] s1 = new byte[2][];
s1[0] = new byte[16];
s1[1] = new byte[16];
byte[][] s2 = new byte[2][];
s2[0] = new byte[16];
s2[1] = new byte[16];
Array.Copy(msg, 0, s1[0], 0, 16);
Array.Copy(msg, 16, s1[1], 0, 16);
s1[0] = AesEnc(s1[0], RC[0]);
s1[1] = AesEnc(s1[1], RC[1]);
s1[0] = AesEnc(s1[0], RC[2]);
s1[1] = AesEnc(s1[1], RC[3]);
Mix256(s1, s2);
s1[0] = AesEnc(s2[0], RC[4]);
s1[1] = AesEnc(s2[1], RC[5]);
s1[0] = AesEnc(s1[0], RC[6]);
s1[1] = AesEnc(s1[1], RC[7]);
Mix256(s1, s2);
s1[0] = AesEnc(s2[0], RC[8]);
s1[1] = AesEnc(s2[1], RC[9]);
s1[0] = AesEnc(s1[0], RC[10]);
s1[1] = AesEnc(s1[1], RC[11]);
Mix256(s1, s2);
s1[0] = AesEnc(s2[0], RC[12]);
s1[1] = AesEnc(s2[1], RC[13]);
s1[0] = AesEnc(s1[0], RC[14]);
s1[1] = AesEnc(s1[1], RC[15]);
Mix256(s1, s2);
s1[0] = AesEnc(s2[0], RC[16]);
s1[1] = AesEnc(s2[1], RC[17]);
s1[0] = AesEnc(s1[0], RC[18]);
s1[1] = AesEnc(s1[1], RC[19]);
Mix256(s1, s2);
s1[0] = Xor(s2[0], msg, 0);
s1[1] = Xor(s2[1], msg, 16);
Array.Copy(s1[0], 0, output, outOff , 16);
Array.Copy(s1[1], 0, output, outOff + 16, 16);
return DIGEST_SIZE;
}
#endif
private static void Mix256(byte[][] s1, byte[][] s2)
{
Array.Copy(s1[0], 0, s2[0], 0, 4);
Array.Copy(s1[1], 0, s2[0], 4, 4);
Array.Copy(s1[0], 4, s2[0], 8, 4);
Array.Copy(s1[1], 4, s2[0], 12, 4);
Array.Copy(s1[0], 8, s2[1], 0, 4);
Array.Copy(s1[1], 8, s2[1], 4, 4);
Array.Copy(s1[0], 12, s2[1], 8, 4);
Array.Copy(s1[1], 12, s2[1], 12, 4);
}
}
}
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