//
// System.Security.Cryptography.SHA512Managed.cs
//
// Authors:
// Dan Lewis (dihlewis@yahoo.co.uk)
// Sebastien Pouliot (sebastien@ximian.com)
//
// (C) 2002
// Implementation translated from Bouncy Castle JCE (http://www.bouncycastle.org/)
// See bouncycastle.txt for license.
// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if !MOONLIGHT
using System.Runtime.InteropServices;
namespace System.Security.Cryptography{
[ComVisible (true)]
public class SHA512Managed : SHA512 {
private byte[] xBuf;
private int xBufOff;
private ulong byteCount1;
private ulong byteCount2;
private ulong H1, H2, H3, H4, H5, H6, H7, H8;
private ulong[] W;
private int wOff;
public SHA512Managed ()
{
xBuf = new byte [8];
W = new ulong [80];
Initialize (false); // limited initialization
}
private void Initialize (bool reuse)
{
// SHA-512 initial hash value
// The first 64 bits of the fractional parts of the square roots
// of the first eight prime numbers
H1 = 0x6a09e667f3bcc908L;
H2 = 0xbb67ae8584caa73bL;
H3 = 0x3c6ef372fe94f82bL;
H4 = 0xa54ff53a5f1d36f1L;
H5 = 0x510e527fade682d1L;
H6 = 0x9b05688c2b3e6c1fL;
H7 = 0x1f83d9abfb41bd6bL;
H8 = 0x5be0cd19137e2179L;
if (reuse) {
byteCount1 = 0;
byteCount2 = 0;
xBufOff = 0;
for (int i = 0; i < xBuf.Length; i++)
xBuf [i] = 0;
wOff = 0;
for (int i = 0; i != W.Length; i++)
W [i] = 0;
}
}
public override void Initialize ()
{
Initialize (true); // reuse instance
}
// protected
protected override void HashCore (byte[] rgb, int ibStart, int cbSize)
{
// fill the current word
while ((xBufOff != 0) && (cbSize > 0)) {
update (rgb [ibStart]);
ibStart++;
cbSize--;
}
// process whole words.
while (cbSize > xBuf.Length) {
processWord (rgb, ibStart);
ibStart += xBuf.Length;
cbSize -= xBuf.Length;
byteCount1 += (ulong) xBuf.Length;
}
// load in the remainder.
while (cbSize > 0) {
update (rgb [ibStart]);
ibStart++;
cbSize--;
}
}
protected override byte[] HashFinal ()
{
adjustByteCounts ();
ulong lowBitLength = byteCount1 << 3;
ulong hiBitLength = byteCount2;
// add the pad bytes.
update (128);
while (xBufOff != 0)
update (0);
processLength (lowBitLength, hiBitLength);
processBlock ();
byte[] output = new byte [64];
unpackWord(H1, output, 0);
unpackWord(H2, output, 8);
unpackWord(H3, output, 16);
unpackWord(H4, output, 24);
unpackWord(H5, output, 32);
unpackWord(H6, output, 40);
unpackWord(H7, output, 48);
unpackWord(H8, output, 56);
Initialize ();
return output;
}
private void update (byte input)
{
xBuf [xBufOff++] = input;
if (xBufOff == xBuf.Length) {
processWord(xBuf, 0);
xBufOff = 0;
}
byteCount1++;
}
private void processWord (byte[] input, int inOff)
{
W [wOff++] = ( (ulong) input [inOff] << 56)
| ( (ulong) input [inOff + 1] << 48)
| ( (ulong) input [inOff + 2] << 40)
| ( (ulong) input [inOff + 3] << 32)
| ( (ulong) input [inOff + 4] << 24)
| ( (ulong) input [inOff + 5] << 16)
| ( (ulong) input [inOff + 6] << 8)
| ( (ulong) input [inOff + 7]);
if (wOff == 16)
processBlock ();
}
private void unpackWord (ulong word, byte[] output, int outOff)
{
output[outOff] = (byte) (word >> 56);
output[outOff + 1] = (byte) (word >> 48);
output[outOff + 2] = (byte) (word >> 40);
output[outOff + 3] = (byte) (word >> 32);
output[outOff + 4] = (byte) (word >> 24);
output[outOff + 5] = (byte) (word >> 16);
output[outOff + 6] = (byte) (word >> 8);
output[outOff + 7] = (byte) word;
}
// adjust the byte counts so that byteCount2 represents the
// upper long (less 3 bits) word of the byte count.
private void adjustByteCounts ()
{
if (byteCount1 > 0x1fffffffffffffffL) {
byteCount2 += (byteCount1 >> 61);
byteCount1 &= 0x1fffffffffffffffL;
}
}
private void processLength (ulong lowW, ulong hiW)
{
if (wOff > 14)
processBlock();
W[14] = hiW;
W[15] = lowW;
}
private void processBlock ()
{
adjustByteCounts ();
// expand 16 word block into 80 word blocks.
for (int t = 16; t <= 79; t++)
W[t] = Sigma1 (W [t - 2]) + W [t - 7] + Sigma0 (W [t - 15]) + W [t - 16];
// set up working variables.
ulong a = H1;
ulong b = H2;
ulong c = H3;
ulong d = H4;
ulong e = H5;
ulong f = H6;
ulong g = H7;
ulong h = H8;
for (int t = 0; t <= 79; t++) {
ulong T1 = h + Sum1 (e) + Ch (e, f, g) + SHAConstants.K2 [t] + W [t];
ulong T2 = Sum0 (a) + Maj (a, b, c);
h = g;
g = f;
f = e;
e = d + T1;
d = c;
c = b;
b = a;
a = T1 + T2;
}
H1 += a;
H2 += b;
H3 += c;
H4 += d;
H5 += e;
H6 += f;
H7 += g;
H8 += h;
// reset the offset and clean out the word buffer.
wOff = 0;
for (int i = 0; i != W.Length; i++)
W[i] = 0;
}
private ulong rotateRight (ulong x, int n)
{
return (x >> n) | (x << (64 - n));
}
/* SHA-512 and SHA-512 functions (as for SHA-256 but for longs) */
private ulong Ch (ulong x, ulong y, ulong z)
{
return ((x & y) ^ ((~x) & z));
}
private ulong Maj (ulong x, ulong y, ulong z)
{
return ((x & y) ^ (x & z) ^ (y & z));
}
private ulong Sum0 (ulong x)
{
return rotateRight (x, 28) ^ rotateRight (x, 34) ^ rotateRight (x, 39);
}
private ulong Sum1 (ulong x)
{
return rotateRight (x, 14) ^ rotateRight (x, 18) ^ rotateRight (x, 41);
}
private ulong Sigma0 (ulong x)
{
return rotateRight (x, 1) ^ rotateRight(x, 8) ^ (x >> 7);
}
private ulong Sigma1 (ulong x)
{
return rotateRight (x, 19) ^ rotateRight (x, 61) ^ (x >> 6);
}
}
}
#endif
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