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author | William Joye <wjoye@cfa.harvard.edu> | 2017-10-17 19:52:11 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2017-10-17 19:52:11 (GMT) |
commit | da0aaf36f00f649cd910b1bcb972b4ad476cd5fd (patch) | |
tree | 3d5215355c39587ed375451b86b7f9962f739a5f /tcl8.6/libtommath/bn_mp_cmp_mag.c | |
parent | 9bfb1e415c87790341c6a3520b081292fcdb058b (diff) | |
parent | c8bc058c566bbcbcd23e732197d64fecc739008f (diff) | |
download | blt-da0aaf36f00f649cd910b1bcb972b4ad476cd5fd.zip blt-da0aaf36f00f649cd910b1bcb972b4ad476cd5fd.tar.gz blt-da0aaf36f00f649cd910b1bcb972b4ad476cd5fd.tar.bz2 |
Merge commit 'c8bc058c566bbcbcd23e732197d64fecc739008f' as 'tcl8.6'
Diffstat (limited to 'tcl8.6/libtommath/bn_mp_cmp_mag.c')
-rw-r--r-- | tcl8.6/libtommath/bn_mp_cmp_mag.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/tcl8.6/libtommath/bn_mp_cmp_mag.c b/tcl8.6/libtommath/bn_mp_cmp_mag.c new file mode 100644 index 0000000..b23a191 --- /dev/null +++ b/tcl8.6/libtommath/bn_mp_cmp_mag.c @@ -0,0 +1,51 @@ +#include <tommath.h> +#ifdef BN_MP_CMP_MAG_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 + */ + +/* compare maginitude of two ints (unsigned) */ +int mp_cmp_mag (const mp_int * a, const mp_int * b) +{ + int n; + mp_digit *tmpa, *tmpb; + + /* compare based on # of non-zero digits */ + if (a->used > b->used) { + return MP_GT; + } + + if (a->used < b->used) { + return MP_LT; + } + + /* alias for a */ + tmpa = a->dp + (a->used - 1); + + /* alias for b */ + tmpb = b->dp + (a->used - 1); + + /* compare based on digits */ + for (n = 0; n < a->used; ++n, --tmpa, --tmpb) { + if (*tmpa > *tmpb) { + return MP_GT; + } + + if (*tmpa < *tmpb) { + return MP_LT; + } + } + return MP_EQ; +} +#endif |