diff options
Diffstat (limited to 'libtommath/bn_mp_div_2d.c')
| -rw-r--r-- | libtommath/bn_mp_div_2d.c | 44 |
1 files changed, 16 insertions, 28 deletions
diff --git a/libtommath/bn_mp_div_2d.c b/libtommath/bn_mp_div_2d.c index 912faaf..c47d5ce 100644 --- a/libtommath/bn_mp_div_2d.c +++ b/libtommath/bn_mp_div_2d.c @@ -1,52 +1,44 @@ #include "tommath_private.h" #ifdef BN_MP_DIV_2D_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. - * - * SPDX-License-Identifier: Unlicense - */ +/* LibTomMath, multiple-precision integer library -- Tom St Denis */ +/* SPDX-License-Identifier: Unlicense */ /* shift right by a certain bit count (store quotient in c, optional remainder in d) */ -int mp_div_2d(const mp_int *a, int b, mp_int *c, mp_int *d) +mp_err mp_div_2d(const mp_int *a, int b, mp_int *c, mp_int *d) { mp_digit D, r, rr; - int x, res; + int x; + mp_err err; /* if the shift count is <= 0 then we do no work */ if (b <= 0) { - res = mp_copy(a, c); + err = mp_copy(a, c); if (d != NULL) { mp_zero(d); } - return res; + return err; } /* copy */ - if ((res = mp_copy(a, c)) != MP_OKAY) { - return res; + if ((err = mp_copy(a, c)) != MP_OKAY) { + return err; } /* 'a' should not be used after here - it might be the same as d */ /* get the remainder */ if (d != NULL) { - if ((res = mp_mod_2d(a, b, d)) != MP_OKAY) { - return res; + if ((err = mp_mod_2d(a, b, d)) != MP_OKAY) { + return err; } } /* shift by as many digits in the bit count */ - if (b >= DIGIT_BIT) { - mp_rshd(c, b / DIGIT_BIT); + if (b >= MP_DIGIT_BIT) { + mp_rshd(c, b / MP_DIGIT_BIT); } - /* shift any bit count < DIGIT_BIT */ - D = (mp_digit)(b % DIGIT_BIT); + /* shift any bit count < MP_DIGIT_BIT */ + D = (mp_digit)(b % MP_DIGIT_BIT); if (D != 0u) { mp_digit *tmpc, mask, shift; @@ -54,7 +46,7 @@ int mp_div_2d(const mp_int *a, int b, mp_int *c, mp_int *d) mask = ((mp_digit)1 << D) - 1uL; /* shift for lsb */ - shift = (mp_digit)DIGIT_BIT - D; + shift = (mp_digit)MP_DIGIT_BIT - D; /* alias */ tmpc = c->dp + (c->used - 1); @@ -77,7 +69,3 @@ int mp_div_2d(const mp_int *a, int b, mp_int *c, mp_int *d) return MP_OKAY; } #endif - -/* ref: $Format:%D$ */ -/* git commit: $Format:%H$ */ -/* commit time: $Format:%ai$ */ |