diff options
author | William Joye <wjoye@cfa.harvard.edu> | 2016-10-18 17:31:11 (GMT) |
---|---|---|
committer | William Joye <wjoye@cfa.harvard.edu> | 2016-10-18 17:31:11 (GMT) |
commit | 066971b1e6e77991d9161bb0216a63ba94ea04f9 (patch) | |
tree | 6de02f79b7a4bb08a329581aa67b444fb9001bfd /tcl8.6/libtommath/bn_mp_mod.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_mod.c')
-rw-r--r-- | tcl8.6/libtommath/bn_mp_mod.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/tcl8.6/libtommath/bn_mp_mod.c b/tcl8.6/libtommath/bn_mp_mod.c new file mode 100644 index 0000000..98e155e --- /dev/null +++ b/tcl8.6/libtommath/bn_mp_mod.c @@ -0,0 +1,44 @@ +#include <tommath.h> +#ifdef BN_MP_MOD_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 + */ + +/* c = a mod b, 0 <= c < b */ +int +mp_mod (mp_int * a, mp_int * b, mp_int * c) +{ + mp_int t; + int res; + + if ((res = mp_init (&t)) != MP_OKAY) { + return res; + } + + if ((res = mp_div (a, b, NULL, &t)) != MP_OKAY) { + mp_clear (&t); + return res; + } + + if (t.sign != b->sign) { + res = mp_add (b, &t, c); + } else { + res = MP_OKAY; + mp_exch (&t, c); + } + + mp_clear (&t); + return res; +} +#endif |