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Diffstat (limited to 'libtommath/bn_mp_abs.c')
-rw-r--r-- | libtommath/bn_mp_abs.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/libtommath/bn_mp_abs.c b/libtommath/bn_mp_abs.c new file mode 100644 index 0000000..dc51884 --- /dev/null +++ b/libtommath/bn_mp_abs.c @@ -0,0 +1,39 @@ +#include <tommath.h> +#ifdef BN_MP_ABS_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| + * + * Simple function copies the input and fixes the sign to positive + */ +int +mp_abs (mp_int * a, mp_int * b) +{ + int res; + + /* copy a to b */ + if (a != b) { + if ((res = mp_copy (a, b)) != MP_OKAY) { + return res; + } + } + + /* force the sign of b to positive */ + b->sign = MP_ZPOS; + + return MP_OKAY; +} +#endif |