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author | kennykb <kennykb@noemail.net> | 2005-01-19 22:41:25 (GMT) |
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committer | kennykb <kennykb@noemail.net> | 2005-01-19 22:41:25 (GMT) |
commit | b3ce7426a67ecb023356a28d94171635385dc616 (patch) | |
tree | 47f8ad0d7291237c7f9af988c5e05275ed9286ee /libtommath/bn_mp_mod.c | |
parent | ccd3f20006ac278b5ded38d34df7f6d6e5b6b886 (diff) | |
download | tcl-b3ce7426a67ecb023356a28d94171635385dc616.zip tcl-b3ce7426a67ecb023356a28d94171635385dc616.tar.gz tcl-b3ce7426a67ecb023356a28d94171635385dc616.tar.bz2 |
Import of libtommath 0.33
FossilOrigin-Name: bd185c2b4e79e51a5759271085f1702fafff39a3
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 |