sha1_consts.h revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* Copyright (c) 1998, by Sun Microsystems, Inc.
* All rights reserved.
*/
#ifndef _SHA1_CONSTS_H
#define _SHA1_CONSTS_H
#pragma ident "%Z%%M% %I% %E% SMI"
#ifdef __cplusplus
extern "C" {
#endif
/*
* as explained in sha1.c, loading 32-bit constants on a sparc is expensive
* since it involves both a `sethi' and an `or'. thus, we instead use `ld'
* to load the constants from an array called `sha1_consts'. however, on
* intel (and perhaps other processors), it is cheaper to load the constant
* directly. thus, the c code in SHA1Transform() uses the macro SHA1_CONST()
* which either expands to a constant or an array reference, depending on
* the architecture the code is being compiled for.
*/
extern const uint32_t sha1_consts[];
#if defined(__sparc)
#define SHA1_CONST(x) (sha1_consts[x])
#else
#define SHA1_CONST(x) (SHA1_CONST_ ## x)
#endif
/* constants, as provided in FIPS 180-1 */
#define SHA1_CONST_0 0x5a827999U
#define SHA1_CONST_1 0x6ed9eba1U
#define SHA1_CONST_2 0x8f1bbcdcU
#define SHA1_CONST_3 0xca62c1d6U
#ifdef __cplusplus
}
#endif
#endif /* _SHA1_CONSTS_H */