_ Git - BoarSSL/blob - Crypto/SHA256.cs

   1 /*
   2  * Copyright (c) 2017 Thomas Pornin <pornin@bolet.org>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining
   5  * a copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sublicense, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  */
  24
  25 using System;
  26
  27 namespace Crypto {
  28
  29 /*
  30  * SHA-256 implementation. SHA-256 is described in FIPS 180-4.
  31  */
  32
  33 public sealed class SHA256 : SHA2Small {
  34
  35         /*
  36          * Create a new instance, ready to process data bytes.
  37          */
  38         public SHA256()
  39         {
  40         }
  41
  42         /* see IDigest */
  43         public override string Name {
  44                 get {
  45                         return "SHA-256";
  46                 }
  47         }
  48
  49         /* see IDigest */
  50         public override int DigestSize {
  51                 get {
  52                         return 32;
  53                 }
  54         }
  55
  56         internal override uint[] IV {
  57                 get {
  58                         return IV256;
  59                 }
  60         }
  61
  62         internal override SHA2Small DupInner()
  63         {
  64                 return new SHA256();
  65         }
  66
  67         static uint[] IV256 = {
  68                 0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
  69                 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19
  70         };
  71 }
  72
  73 }