diff options
Diffstat (limited to 'libtommath/bn_mp_rshd.c')
| -rw-r--r-- | libtommath/bn_mp_rshd.c | 76 |
1 files changed, 38 insertions, 38 deletions
diff --git a/libtommath/bn_mp_rshd.c b/libtommath/bn_mp_rshd.c index 2a693c5..e799a4c 100644 --- a/libtommath/bn_mp_rshd.c +++ b/libtommath/bn_mp_rshd.c @@ -16,54 +16,54 @@ */ /* shift right a certain amount of digits */ -void mp_rshd (mp_int * a, int b) +void mp_rshd(mp_int * a, int b) { - int x; + int x; - /* if b <= 0 then ignore it */ - if (b <= 0) { - return; - } + /* if b <= 0 then ignore it */ + if (b <= 0) { + return; + } - /* if b > used then simply zero it and return */ - if (a->used <= b) { - mp_zero (a); - return; - } + /* if b > used then simply zero it and return */ + if (a->used <= b) { + mp_zero(a); + return; + } - { - register mp_digit *bottom, *top; + { + register mp_digit *bottom, *top; - /* shift the digits down */ + /* shift the digits down */ - /* bottom */ - bottom = a->dp; + /* bottom */ + bottom = a->dp; - /* top [offset into digits] */ - top = a->dp + b; + /* top [offset into digits] */ + top = a->dp + b; - /* this is implemented as a sliding window where - * the window is b-digits long and digits from - * the top of the window are copied to the bottom - * - * e.g. + /* this is implemented as a sliding window where + * the window is b-digits long and digits from + * the top of the window are copied to the bottom + * + * e.g. - b-2 | b-1 | b0 | b1 | b2 | ... | bb | ----> - /\ | ----> - \-------------------/ ----> - */ - for (x = 0; x < (a->used - b); x++) { - *bottom++ = *top++; - } + b-2 | b-1 | b0 | b1 | b2 | ... | bb | ----> + /\ | ----> + \-------------------/ ----> + */ + for (x = 0; x < (a->used - b); x++) { + *bottom++ = *top++; + } - /* zero the top digits */ - for (; x < a->used; x++) { - *bottom++ = 0; - } - } - - /* remove excess digits */ - a->used -= b; + /* zero the top digits */ + for (; x < a->used; x++) { + *bottom++ = 0; + } + } + + /* remove excess digits */ + a->used -= b; } #endif |