class/corlib/System.Security.Cryptography/SHA384Managed.cs

   1 //
   2 // System.Security.Cryptography.SHA384Managed.cs
   3 //
   4 // Authors:
   5 //      Dan Lewis (dihlewis@yahoo.co.uk)
   6 //      Sebastien Pouliot (sebastien@ximian.com)
   7 //
   8 // (C) 2002
   9 // Implementation translated from Bouncy Castle JCE (http://www.bouncycastle.org/)
  10 // See bouncycastle.txt for license.
  11 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 #if !MOONLIGHT
  34
  35 using System.Runtime.InteropServices;
  36
  37 namespace System.Security.Cryptography {
  38
  39 [ComVisible (true)]
  40 public class SHA384Managed : SHA384 {
  41
  42         private byte[] xBuf;
  43         private int xBufOff;
  44
  45         private ulong byteCount1;
  46         private ulong byteCount2;
  47
  48         private ulong H1, H2, H3, H4, H5, H6, H7, H8;
  49         private ulong[] W;
  50         private int wOff;
  51
  52         public SHA384Managed ()
  53         {
  54                 xBuf = new byte [8];
  55                 W = new ulong [80];
  56                 Initialize (false); // limited initialization
  57         }
  58
  59         private void Initialize (bool reuse)
  60         {
  61                 // SHA-384 initial hash value
  62                 // The first 64 bits of the fractional parts of the square roots
  63                 // of the 9th through 16th prime numbers
  64                 H1 = 0xcbbb9d5dc1059ed8L;
  65                 H2 = 0x629a292a367cd507L;
  66                 H3 = 0x9159015a3070dd17L;
  67                 H4 = 0x152fecd8f70e5939L;
  68                 H5 = 0x67332667ffc00b31L;
  69                 H6 = 0x8eb44a8768581511L;
  70                 H7 = 0xdb0c2e0d64f98fa7L;
  71                 H8 = 0x47b5481dbefa4fa4L;
  72
  73                 if (reuse) {
  74                         byteCount1 = 0;
  75                         byteCount2 = 0;
  76
  77                         xBufOff = 0;
  78                         for (int i = 0; i < xBuf.Length; i++)
  79                                 xBuf [i] = 0;
  80
  81                         wOff = 0;
  82                         for (int i = 0; i != W.Length; i++)
  83                                 W [i] = 0;
  84                 }
  85         }
  86
  87         public override void Initialize ()
  88         {
  89                 Initialize (true); // reuse instance
  90         }
  91
  92         // protected
  93
  94         protected override void HashCore (byte[] rgb, int ibStart, int cbSize)
  95         {
  96                 // fill the current word
  97                 while ((xBufOff != 0) && (cbSize > 0)) {
  98                         update (rgb [ibStart]);
  99                         ibStart++;
 100                         cbSize--;
 101                 }
 102
 103                 // process whole words.
 104                 while (cbSize > xBuf.Length) {
 105                         processWord (rgb, ibStart);
 106                         ibStart += xBuf.Length;
 107                         cbSize -= xBuf.Length;
 108                         byteCount1 += (ulong) xBuf.Length;
 109                 }
 110
 111                 // load in the remainder.
 112                 while (cbSize > 0) {
 113                         update (rgb [ibStart]);
 114                         ibStart++;
 115                         cbSize--;
 116                 }
 117         }
 118
 119         protected override byte[] HashFinal ()
 120         {
 121                 adjustByteCounts ();
 122
 123                 ulong lowBitLength = byteCount1 << 3;
 124                 ulong hiBitLength = byteCount2;
 125
 126                 // add the pad bytes.
 127                 update ( (byte) 128);
 128                 while (xBufOff != 0)
 129                         update ( (byte)0);
 130
 131                 processLength (lowBitLength, hiBitLength);
 132                 processBlock ();
 133
 134                 byte[] output = new byte [48];
 135                 unpackWord(H1, output, 0);
 136                 unpackWord(H2, output, 8);
 137                 unpackWord(H3, output, 16);
 138                 unpackWord(H4, output, 24);
 139                 unpackWord(H5, output, 32);
 140                 unpackWord(H6, output, 40);
 141
 142                 Initialize ();
 143                 return output;
 144         }
 145
 146         private void update (byte input)
 147         {
 148                 xBuf [xBufOff++] = input;
 149                 if (xBufOff == xBuf.Length) {
 150                         processWord(xBuf, 0);
 151                         xBufOff = 0;
 152                 }
 153                 byteCount1++;
 154         }
 155
 156         private void processWord (byte[] input, int inOff)
 157         {
 158                 W [wOff++] = ( (ulong) input [inOff] << 56)
 159                         | ( (ulong) input [inOff + 1] << 48)
 160                         | ( (ulong) input [inOff + 2] << 40)
 161                         | ( (ulong) input [inOff + 3] << 32)
 162                         | ( (ulong) input [inOff + 4] << 24)
 163                         | ( (ulong) input [inOff + 5] << 16)
 164                         | ( (ulong) input [inOff + 6] << 8)
 165                         | ( (ulong) input [inOff + 7]);
 166                 if (wOff == 16)
 167                         processBlock ();
 168         }
 169
 170         private void unpackWord (ulong word, byte[] output, int outOff)
 171         {
 172                 output[outOff]     = (byte) (word >> 56);
 173                 output[outOff + 1] = (byte) (word >> 48);
 174                 output[outOff + 2] = (byte) (word >> 40);
 175                 output[outOff + 3] = (byte) (word >> 32);
 176                 output[outOff + 4] = (byte) (word >> 24);
 177                 output[outOff + 5] = (byte) (word >> 16);
 178                 output[outOff + 6] = (byte) (word >> 8);
 179                 output[outOff + 7] = (byte) word;
 180         }
 181
 182         // adjust the byte counts so that byteCount2 represents the
 183         // upper long (less 3 bits) word of the byte count.
 184         private void adjustByteCounts()
 185         {
 186                 if (byteCount1 > 0x1fffffffffffffffL) {
 187                         byteCount2 += (byteCount1 >> 61);
 188                         byteCount1 &= 0x1fffffffffffffffL;
 189                 }
 190         }
 191
 192         private void processLength (ulong lowW, ulong hiW)
 193         {
 194                 if (wOff > 14)
 195                         processBlock ();
 196                 W[14] = hiW;
 197                 W[15] = lowW;
 198         }
 199
 200         private void processBlock ()
 201         {
 202                 ulong a, b, c, d, e, f, g, h;
 203
 204                 // abcrem doesn't work on fields
 205                 ulong[] W = this.W;
 206                 ulong[] K2 = SHAConstants.K2;
 207
 208                 adjustByteCounts ();
 209                 // expand 16 word block into 80 word blocks.
 210                 for (int t = 16; t <= 79; t++)
 211                 {
 212                         a = W[t-15];
 213                         a = ((a >> 1) | (a << 63)) ^ ((a >> 8) | (a << 56)) ^ (a >> 7);
 214                         b = W[t - 2];
 215                         b = ((b >> 19) | (b << 45)) ^ ((b >> 61) | (b << 3)) ^ (b >> 6);
 216                         W[t] = b + W[t - 7] + a + W[t - 16];
 217                 }
 218                 // set up working variables.
 219                 a = H1;
 220                 b = H2;
 221                 c = H3;
 222                 d = H4;
 223                 e = H5;
 224                 f = H6;
 225                 g = H7;
 226                 h = H8;
 227
 228                 for (int t = 0; t <= 79; t++)
 229                 {
 230                         ulong T1 = ((e >> 14) | (e << 50)) ^ ((e >> 18) | (e << 46)) ^ ((e >> 41) | (e << 23));
 231                         T1 += h + ((e & f) ^ ((~e) & g)) + K2[t] + W[t];
 232
 233                         ulong T2 = ((a >> 28) | (a << 36)) ^ ((a >> 34) | (a << 30)) ^ ((a >> 39) | (a << 25));
 234                         T2 += ((a & b) ^ (a & c) ^ (b & c));
 235
 236                         h = g;
 237                         g = f;
 238                         f = e;
 239                         e = d + T1;
 240                         d = c;
 241                         c = b;
 242                         b = a;
 243                         a = T1 + T2;
 244                 }
 245
 246                 H1 += a;
 247                 H2 += b;
 248                 H3 += c;
 249                 H4 += d;
 250                 H5 += e;
 251                 H6 += f;
 252                 H7 += g;
 253                 H8 += h;
 254                 // reset the offset and clean out the word buffer.
 255                 wOff = 0;
 256                 for (int i = 0; i != W.Length; i++)
 257                         W[i] = 0;
 258         }
 259 }
 260
 261 }
 262
 263 #endif
 264