mcs/class/Mono.Security/Mono.Security.Cryptography/SHA224.cs

   1 //
   2 // Mono.Security.Cryptography SHA224 Class implementation
   3 //
   4 // Authors:
   5 //      Sebastien Pouliot <sebastien@ximian.com>
   6 //
   7 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System.Security.Cryptography;
  30
  31 namespace Mono.Security.Cryptography {
  32
  33 // FIXME: Remove when (or if) SHA224 moves into corlib
  34 // (as corlib already have the required constants).
  35         internal sealed class SHAConstants {
  36
  37                 private SHAConstants ()
  38                 {
  39                         // Never instantiated.
  40                 }
  41
  42                 // SHA-224/256 Constants
  43                 // Represent the first 32 bits of the fractional parts of the
  44                 // cube roots of the first sixty-four prime numbers
  45                 public readonly static uint[] K1 = {
  46                         0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
  47                         0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
  48                         0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
  49                         0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
  50                         0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
  51                         0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
  52                         0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
  53                         0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
  54                         0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
  55                         0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
  56                         0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
  57                         0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
  58                         0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
  59                         0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
  60                         0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
  61                         0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2
  62                 };
  63         }
  64
  65         public abstract class SHA224 : HashAlgorithm {
  66
  67                 public SHA224 ()
  68                 {
  69                         // SHA-224 hash length are 224 bits long
  70                         HashSizeValue = 224;
  71                 }
  72
  73                 public static new SHA224 Create ()
  74                 {
  75                         // for this to work we must register ourself with CryptoConfig
  76                         return Create ("SHA224");
  77                 }
  78
  79                 public static new SHA224 Create (string hashName)
  80                 {
  81                         object o = CryptoConfig.CreateFromName (hashName);
  82                         // in case machine.config isn't configured to use any SHA224 implementation
  83                         if (o == null) {
  84                                 o = new SHA224Managed ();
  85                         }
  86                         return (SHA224) o;
  87                 }
  88         }
  89 }