Sha256Digest
using Renci.SshNet.Security.Org.BouncyCastle.Crypto.Utilities;
using Renci.SshNet.Security.Org.BouncyCastle.Utilities;
using System;
namespace Renci.SshNet.Security.Org.BouncyCastle.Crypto.Digests
{
internal class Sha256Digest : GeneralDigest
{
private const int DigestLength = 32;
private uint H1;
private uint H2;
private uint H3;
private uint H4;
private uint H5;
private uint H6;
private uint H7;
private uint H8;
private uint[] X = new uint[64];
private int xOff;
private static readonly uint[] K = new uint[64] {
1116352408,
1899447441,
3049323471,
3921009573,
961987163,
1508970993,
2453635748,
2870763221,
3624381080,
310598401,
607225278,
1426881987,
1925078388,
2162078206,
2614888103,
3248222580,
3835390401,
4022224774,
264347078,
604807628,
770255983,
1249150122,
1555081692,
1996064986,
2554220882,
2821834349,
2952996808,
3210313671,
3336571891,
3584528711,
113926993,
338241895,
666307205,
773529912,
1294757372,
1396182291,
1695183700,
1986661051,
2177026350,
2456956037,
2730485921,
2820302411,
3259730800,
3345764771,
3516065817,
3600352804,
4094571909,
275423344,
430227734,
506948616,
659060556,
883997877,
958139571,
1322822218,
1537002063,
1747873779,
1955562222,
2024104815,
2227730452,
2361852424,
2428436474,
2756734187,
3204031479,
3329325298
};
public override string AlgorithmName => "SHA-256";
public Sha256Digest()
{
initHs();
}
public Sha256Digest(Sha256Digest t)
: base(t)
{
CopyIn(t);
}
private void CopyIn(Sha256Digest t)
{
CopyIn((GeneralDigest)t);
H1 = t.H1;
H2 = t.H2;
H3 = t.H3;
H4 = t.H4;
H5 = t.H5;
H6 = t.H6;
H7 = t.H7;
H8 = t.H8;
Array.Copy(t.X, 0, X, 0, t.X.Length);
xOff = t.xOff;
}
public override int GetDigestSize()
{
return 32;
}
internal override void ProcessWord(byte[] input, int inOff)
{
X[xOff] = Pack.BE_To_UInt32(input, inOff);
if (++xOff == 16)
ProcessBlock();
}
internal override void ProcessLength(long bitLength)
{
if (xOff > 14)
ProcessBlock();
X[14] = (uint)((ulong)bitLength >> 32);
X[15] = (uint)bitLength;
}
public override int DoFinal(byte[] output, int outOff)
{
Finish();
Pack.UInt32_To_BE(H1, output, outOff);
Pack.UInt32_To_BE(H2, output, outOff + 4);
Pack.UInt32_To_BE(H3, output, outOff + 8);
Pack.UInt32_To_BE(H4, output, outOff + 12);
Pack.UInt32_To_BE(H5, output, outOff + 16);
Pack.UInt32_To_BE(H6, output, outOff + 20);
Pack.UInt32_To_BE(H7, output, outOff + 24);
Pack.UInt32_To_BE(H8, output, outOff + 28);
Reset();
return 32;
}
public override void Reset()
{
base.Reset();
initHs();
xOff = 0;
Array.Clear(X, 0, X.Length);
}
private void initHs()
{
H1 = 1779033703;
H2 = 3144134277;
H3 = 1013904242;
H4 = 2773480762;
H5 = 1359893119;
H6 = 2600822924;
H7 = 528734635;
H8 = 1541459225;
}
internal override void ProcessBlock()
{
for (int i = 16; i <= 63; i++) {
X[i] = Theta1(X[i - 2]) + X[i - 7] + Theta0(X[i - 15]) + X[i - 16];
}
uint num = H1;
uint num2 = H2;
uint num3 = H3;
uint num4 = H4;
uint num5 = H5;
uint num6 = H6;
uint num7 = H7;
uint num8 = H8;
int num9 = 0;
for (int j = 0; j < 8; j++) {
num8 += Sum1Ch(num5, num6, num7) + K[num9] + X[num9];
num4 += num8;
num8 += Sum0Maj(num, num2, num3);
num9++;
num7 += Sum1Ch(num4, num5, num6) + K[num9] + X[num9];
num3 += num7;
num7 += Sum0Maj(num8, num, num2);
num9++;
num6 += Sum1Ch(num3, num4, num5) + K[num9] + X[num9];
num2 += num6;
num6 += Sum0Maj(num7, num8, num);
num9++;
num5 += Sum1Ch(num2, num3, num4) + K[num9] + X[num9];
num += num5;
num5 += Sum0Maj(num6, num7, num8);
num9++;
num4 += Sum1Ch(num, num2, num3) + K[num9] + X[num9];
num8 += num4;
num4 += Sum0Maj(num5, num6, num7);
num9++;
num3 += Sum1Ch(num8, num, num2) + K[num9] + X[num9];
num7 += num3;
num3 += Sum0Maj(num4, num5, num6);
num9++;
num2 += Sum1Ch(num7, num8, num) + K[num9] + X[num9];
num6 += num2;
num2 += Sum0Maj(num3, num4, num5);
num9++;
num += Sum1Ch(num6, num7, num8) + K[num9] + X[num9];
num5 += num;
num += Sum0Maj(num2, num3, num4);
num9++;
}
H1 += num;
H2 += num2;
H3 += num3;
H4 += num4;
H5 += num5;
H6 += num6;
H7 += num7;
H8 += num8;
xOff = 0;
Array.Clear(X, 0, 16);
}
private static uint Sum1Ch(uint x, uint y, uint z)
{
return (((x >> 6) | (x << 26)) ^ ((x >> 11) | (x << 21)) ^ ((x >> 25) | (x << 7))) + ((x & y) ^ (~x & z));
}
private static uint Sum0Maj(uint x, uint y, uint z)
{
return (((x >> 2) | (x << 30)) ^ ((x >> 13) | (x << 19)) ^ ((x >> 22) | (x << 10))) + ((x & y) ^ (x & z) ^ (y & z));
}
private static uint Theta0(uint x)
{
return ((x >> 7) | (x << 25)) ^ ((x >> 18) | (x << 14)) ^ (x >> 3);
}
private static uint Theta1(uint x)
{
return ((x >> 17) | (x << 15)) ^ ((x >> 19) | (x << 13)) ^ (x >> 10);
}
public override IMemoable Copy()
{
return new Sha256Digest(this);
}
public override void Reset(IMemoable other)
{
Sha256Digest t = (Sha256Digest)other;
CopyIn(t);
}
}
}