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author | Kevin B Kenny <kennykb@acm.org> | 2005-01-19 22:41:26 (GMT) |
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committer | Kevin B Kenny <kennykb@acm.org> | 2005-01-19 22:41:26 (GMT) |
commit | 8df47fab3cdd02f03283e22c2b2226f0fe7a2ab4 (patch) | |
tree | 1f0868ef44c9f17d83d10dc94343df7b8cfe1842 /libtommath/bn_mp_mod.c | |
parent | c6a259aeeca4814a97cf6694814c63e74e4e18fa (diff) | |
download | tcl-8df47fab3cdd02f03283e22c2b2226f0fe7a2ab4.zip tcl-8df47fab3cdd02f03283e22c2b2226f0fe7a2ab4.tar.gz tcl-8df47fab3cdd02f03283e22c2b2226f0fe7a2ab4.tar.bz2 |
Import of libtommath 0.33
Diffstat (limited to 'libtommath/bn_mp_mod.c')
-rw-r--r-- | libtommath/bn_mp_mod.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/libtommath/bn_mp_mod.c b/libtommath/bn_mp_mod.c new file mode 100644 index 0000000..75779bb --- /dev/null +++ b/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@iahu.ca, http://math.libtomcrypt.org + */ + +/* 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 |