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Diffstat (limited to 'libtommath/bn_mp_dr_setup.c')
| -rw-r--r-- | libtommath/bn_mp_dr_setup.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/libtommath/bn_mp_dr_setup.c b/libtommath/bn_mp_dr_setup.c new file mode 100644 index 0000000..029d310 --- /dev/null +++ b/libtommath/bn_mp_dr_setup.c @@ -0,0 +1,28 @@ +#include <tommath.h> +#ifdef BN_MP_DR_SETUP_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 + */ + +/* determines the setup value */ +void mp_dr_setup(mp_int *a, mp_digit *d) +{ + /* the casts are required if DIGIT_BIT is one less than + * the number of bits in a mp_digit [e.g. DIGIT_BIT==31] + */ + *d = (mp_digit)((((mp_word)1) << ((mp_word)DIGIT_BIT)) - + ((mp_word)a->dp[0])); +} + +#endif |