tommath/bn_mp_read_signed_bin.c

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#include <tommath.h>
#ifdef BN_MP_READ_SIGNED_BIN_C
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/* LibTomMath, multiple-precision integer library -- Tom St Denis
*
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* LibTomMath is a library that provides multiple-precision
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* integer arithmetic as well as number theoretic functionality.
*
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* The library was designed directly after the MPI library by
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* Michael Fromberger but has been written from scratch with
* additional optimizations in place.
*
* The library is free for all purposes without any express
* guarantee it works.
*
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* Tom St Denis, tomstdenis@gmail.com, http://libtom.org
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*/
/* read signed bin, big endian, first byte is 0==positive or 1==negative */
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int mp_read_signed_bin (mp_int * a, const unsigned char *b, int c)
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{
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int res;
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/* read magnitude */
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if ((res = mp_read_unsigned_bin (a, b + 1, c - 1)) != MP_OKAY) {
return res;
}
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/* first byte is 0 for positive, non-zero for negative */
if (b[0] == 0) {
a->sign = MP_ZPOS;
} else {
a->sign = MP_NEG;
}
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return MP_OKAY;
}
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#endif
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/* $Source$ */
/* $Revision$ */
/* $Date$ */