lib/hcrypto/hash.h

   1 /*
   2  * Copyright (c) 1999 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of KTH nor the names of its contributors may be
  18  *    used to endorse or promote products derived from this software without
  19  *    specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY KTH AND ITS CONTRIBUTORS ``AS IS'' AND ANY
  22  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  24  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL KTH OR ITS CONTRIBUTORS BE
  25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  28  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  29  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  30  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  31  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
  32
  33 /* $Id$ */
  34
  35 /* stuff in common between md4, md5, and sha1 */
  36
  37 #ifndef __hash_h__
  38 #define __hash_h__
  39
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <stddef.h>
  43 #ifdef KRB5
  44 #include <krb5-types.h>
  45 #endif
  46
  47 #ifndef min
  48 #define min(a,b) (((a)>(b))?(b):(a))
  49 #endif
  50
  51 /* Vector Crays doesn't have a good 32-bit type, or more precisely,
  52    int32_t as defined by <bind/bitypes.h> isn't 32 bits, and we don't
  53    want to depend in being able to redefine this type.  To cope with
  54    this we have to clamp the result in some places to [0,2^32); no
  55    need to do this on other machines.  Did I say this was a mess?
  56    */
  57
  58 #ifdef _CRAY
  59 #define CRAYFIX(X) ((X) & 0xffffffff)
  60 #else
  61 #define CRAYFIX(X) (X)
  62 #endif
  63
  64 static inline uint32_t
  65 cshift (uint32_t x, unsigned int n)
  66 {
  67     x = CRAYFIX(x);
  68     return CRAYFIX((x << n) | (x >> (32 - n)));
  69 }
  70
  71 #endif /* __hash_h__ */