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author | William Joye <wjoye@cfa.harvard.edu> | 2016-10-18 17:31:11 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2016-10-18 17:31:11 (GMT) |
commit | 066971b1e6e77991d9161bb0216a63ba94ea04f9 (patch) | |
tree | 6de02f79b7a4bb08a329581aa67b444fb9001bfd /tcl8.6/libtommath/bn_mp_neg.c | |
parent | ba065c2de121da1c1dfddd0aa587d10e7e150f05 (diff) | |
parent | 9966985d896629eede849a84f18e406d1164a16c (diff) | |
download | blt-066971b1e6e77991d9161bb0216a63ba94ea04f9.zip blt-066971b1e6e77991d9161bb0216a63ba94ea04f9.tar.gz blt-066971b1e6e77991d9161bb0216a63ba94ea04f9.tar.bz2 |
Merge commit '9966985d896629eede849a84f18e406d1164a16c' as 'tcl8.6'
Diffstat (limited to 'tcl8.6/libtommath/bn_mp_neg.c')
-rw-r--r-- | tcl8.6/libtommath/bn_mp_neg.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/tcl8.6/libtommath/bn_mp_neg.c b/tcl8.6/libtommath/bn_mp_neg.c new file mode 100644 index 0000000..07fb148 --- /dev/null +++ b/tcl8.6/libtommath/bn_mp_neg.c @@ -0,0 +1,36 @@ +#include <tommath.h> +#ifdef BN_MP_NEG_C +/* LibTomMath, multiple-precision integer library -- Tom St Denis + * + * LibTomMath is a library that provides multiple-precision + * integer arithmetic as well as number theoretic functionality. + * + * The library was designed directly after the MPI library by + * 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. + * + * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com + */ + +/* b = -a */ +int mp_neg (const mp_int * a, mp_int * b) +{ + int res; + if (a != b) { + if ((res = mp_copy (a, b)) != MP_OKAY) { + return res; + } + } + + if (mp_iszero(b) != MP_YES) { + b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS; + } else { + b->sign = MP_ZPOS; + } + + return MP_OKAY; +} +#endif |