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using System;
using Org.BouncyCastle.Crypto.Utilities;
namespace Org.BouncyCastle.Crypto.Digests
{
/**
* FIPS 180-4 implementation of SHA-512/t
*/
public class Sha512tDigest
: LongDigest
{
private const ulong A5 = 0xa5a5a5a5a5a5a5a5UL;
private readonly int digestLength;
private ulong H1t, H2t, H3t, H4t, H5t, H6t, H7t, H8t;
/**
* Standard constructor
*/
public Sha512tDigest(int bitLength)
{
if (bitLength >= 512)
throw new ArgumentException("cannot be >= 512", "bitLength");
if (bitLength % 8 != 0)
throw new ArgumentException("needs to be a multiple of 8", "bitLength");
if (bitLength == 384)
throw new ArgumentException("cannot be 384 use SHA384 instead", "bitLength");
this.digestLength = bitLength / 8;
tIvGenerate(digestLength * 8);
Reset();
}
/**
* Copy constructor. This will copy the state of the provided
* message digest.
*/
public Sha512tDigest(Sha512tDigest t)
: base(t)
{
this.digestLength = t.digestLength;
this.H1t = t.H1t;
this.H2t = t.H2t;
this.H3t = t.H3t;
this.H4t = t.H4t;
this.H5t = t.H5t;
this.H6t = t.H6t;
this.H7t = t.H7t;
this.H8t = t.H8t;
}
public override string AlgorithmName
{
get { return "SHA-512/" + (digestLength * 8); }
}
public override int GetDigestSize()
{
return digestLength;
}
public override int DoFinal(byte[] output, int outOff)
{
Finish();
UInt64_To_BE(H1, output, outOff, digestLength);
UInt64_To_BE(H2, output, outOff + 8, digestLength - 8);
UInt64_To_BE(H3, output, outOff + 16, digestLength - 16);
UInt64_To_BE(H4, output, outOff + 24, digestLength - 24);
UInt64_To_BE(H5, output, outOff + 32, digestLength - 32);
UInt64_To_BE(H6, output, outOff + 40, digestLength - 40);
UInt64_To_BE(H7, output, outOff + 48, digestLength - 48);
UInt64_To_BE(H8, output, outOff + 56, digestLength - 56);
Reset();
return digestLength;
}
/**
* reset the chaining variables
*/
public override void Reset()
{
base.Reset();
/*
* initial hash values use the iv generation algorithm for t.
*/
H1 = H1t;
H2 = H2t;
H3 = H3t;
H4 = H4t;
H5 = H5t;
H6 = H6t;
H7 = H7t;
H8 = H8t;
}
private void tIvGenerate(int bitLength)
{
H1 = 0x6a09e667f3bcc908UL ^ A5;
H2 = 0xbb67ae8584caa73bUL ^ A5;
H3 = 0x3c6ef372fe94f82bUL ^ A5;
H4 = 0xa54ff53a5f1d36f1UL ^ A5;
H5 = 0x510e527fade682d1UL ^ A5;
H6 = 0x9b05688c2b3e6c1fUL ^ A5;
H7 = 0x1f83d9abfb41bd6bUL ^ A5;
H8 = 0x5be0cd19137e2179UL ^ A5;
Update(0x53);
Update(0x48);
Update(0x41);
Update(0x2D);
Update(0x35);
Update(0x31);
Update(0x32);
Update(0x2F);
if (bitLength > 100)
{
Update((byte)(bitLength / 100 + 0x30));
bitLength = bitLength % 100;
Update((byte)(bitLength / 10 + 0x30));
bitLength = bitLength % 10;
Update((byte)(bitLength + 0x30));
}
else if (bitLength > 10)
{
Update((byte)(bitLength / 10 + 0x30));
bitLength = bitLength % 10;
Update((byte)(bitLength + 0x30));
}
else
{
Update((byte)(bitLength + 0x30));
}
Finish();
H1t = H1;
H2t = H2;
H3t = H3;
H4t = H4;
H5t = H5;
H6t = H6;
H7t = H7;
H8t = H8;
}
private static void UInt64_To_BE(ulong n, byte[] bs, int off, int max)
{
if (max > 0)
{
UInt32_To_BE((uint)(n >> 32), bs, off, max);
if (max > 4)
{
UInt32_To_BE((uint)n, bs, off + 4, max - 4);
}
}
}
private static void UInt32_To_BE(uint n, byte[] bs, int off, int max)
{
int num = System.Math.Min(4, max);
while (--num >= 0)
{
int shift = 8 * (3 - num);
bs[off + num] = (byte)(n >> shift);
}
}
}
}
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