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      1 /*	$NetBSD: hash.h,v 1.2 2017/01/28 21:31:47 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1999 Kungliga Tekniska Hgskolan
      5  * (Royal Institute of Technology, Stockholm, Sweden).
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  *
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  *
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * 3. Neither the name of KTH nor the names of its contributors may be
     20  *    used to endorse or promote products derived from this software without
     21  *    specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY KTH AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     24  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     26  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL KTH OR ITS CONTRIBUTORS BE
     27  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
     30  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     31  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     32  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     33  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
     34 
     35 /* Id */
     36 
     37 /* stuff in common between md4, md5, and sha1 */
     38 
     39 #ifndef __hash_h__
     40 #define __hash_h__
     41 
     42 #ifdef KRB5
     43 #include <krb5/krb5-types.h>
     44 #endif
     45 
     46 #ifndef min
     47 #define min(a,b) (((a)>(b))?(b):(a))
     48 #endif
     49 
     50 /* Vector Crays doesn't have a good 32-bit type, or more precisely,
     51    int32_t as defined by <bind/bitypes.h> isn't 32 bits, and we don't
     52    want to depend in being able to redefine this type.  To cope with
     53    this we have to clamp the result in some places to [0,2^32); no
     54    need to do this on other machines.  Did I say this was a mess?
     55    */
     56 
     57 #ifdef _CRAY
     58 #define CRAYFIX(X) ((X) & 0xffffffff)
     59 #else
     60 #define CRAYFIX(X) (X)
     61 #endif
     62 
     63 static inline uint32_t
     64 cshift (uint32_t x, unsigned int n)
     65 {
     66     x = CRAYFIX(x);
     67     return CRAYFIX((x << n) | (x >> (32 - n)));
     68 }
     69 
     70 static inline uint64_t
     71 cshift64 (uint64_t x, unsigned int n)
     72 {
     73   return ((uint64_t)x << (uint64_t)n) | ((uint64_t)x >> ((uint64_t)64 - (uint64_t)n));
     74 }
     75 
     76 #endif /* __hash_h__ */
     77