include/sys/sha1_consts.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1998, by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #ifndef _SYS_SHA1_CONSTS_H
  28 #define _SYS_SHA1_CONSTS_H
  29
  30 #ifdef  __cplusplus
  31 extern "C" {
  32 #endif
  33
  34 /*
  35  * as explained in sha1.c, loading 32-bit constants on a sparc is expensive
  36  * since it involves both a `sethi' and an `or'.  thus, we instead use `ld'
  37  * to load the constants from an array called `sha1_consts'.  however, on
  38  * intel (and perhaps other processors), it is cheaper to load the constant
  39  * directly.  thus, the c code in SHA1Transform() uses the macro SHA1_CONST()
  40  * which either expands to a constant or an array reference, depending on
  41  * the architecture the code is being compiled for.
  42  */
  43
  44 #include <sys/types.h>          /* uint32_t */
  45
  46 extern  const uint32_t  sha1_consts[];
  47
  48 #if     defined(__sparc)
  49 #define SHA1_CONST(x)           (sha1_consts[x])
  50 #else
  51 #define SHA1_CONST(x)           (SHA1_CONST_ ## x)
  52 #endif
  53
  54 /* constants, as provided in FIPS 180-1 */
  55
  56 #define SHA1_CONST_0            0x5a827999U
  57 #define SHA1_CONST_1            0x6ed9eba1U
  58 #define SHA1_CONST_2            0x8f1bbcdcU
  59 #define SHA1_CONST_3            0xca62c1d6U
  60
  61 #ifdef  __cplusplus
  62 }
  63 #endif
  64
  65 #endif /* _SYS_SHA1_CONSTS_H */