diff options
Diffstat (limited to 'libtommath/bn_mp_montgomery_reduce.c')
| -rw-r--r-- | libtommath/bn_mp_montgomery_reduce.c | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/libtommath/bn_mp_montgomery_reduce.c b/libtommath/bn_mp_montgomery_reduce.c index bc6abb8..af2cc58 100644 --- a/libtommath/bn_mp_montgomery_reduce.c +++ b/libtommath/bn_mp_montgomery_reduce.c @@ -1,4 +1,4 @@ -#include <tommath.h> +#include <tommath_private.h> #ifdef BN_MP_MONTGOMERY_REDUCE_C /* LibTomMath, multiple-precision integer library -- Tom St Denis * @@ -12,7 +12,7 @@ * The library is free for all purposes without any express * guarantee it works. * - * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com + * Tom St Denis, tstdenis82@gmail.com, http://libtom.org */ /* computes xR**-1 == x (mod N) via Montgomery Reduction */ @@ -28,10 +28,10 @@ mp_montgomery_reduce (mp_int * x, mp_int * n, mp_digit rho) * than the available columns [255 per default] since carries * are fixed up in the inner loop. */ - digs = n->used * 2 + 1; + digs = (n->used * 2) + 1; if ((digs < MP_WARRAY) && - n->used < - (1 << ((CHAR_BIT * sizeof (mp_word)) - (2 * DIGIT_BIT)))) { + (n->used < + (1 << ((CHAR_BIT * sizeof(mp_word)) - (2 * DIGIT_BIT))))) { return fast_mp_montgomery_reduce (x, n, rho); } @@ -52,13 +52,13 @@ mp_montgomery_reduce (mp_int * x, mp_int * n, mp_digit rho) * following inner loop to reduce the * input one digit at a time */ - mu = (mp_digit) (((mp_word)x->dp[ix]) * ((mp_word)rho) & MP_MASK); + mu = (mp_digit) (((mp_word)x->dp[ix] * (mp_word)rho) & MP_MASK); /* a = a + mu * m * b**i */ { - register int iy; - register mp_digit *tmpn, *tmpx, u; - register mp_word r; + int iy; + mp_digit *tmpn, *tmpx, u; + mp_word r; /* alias for digits of the modulus */ tmpn = n->dp; @@ -72,8 +72,8 @@ mp_montgomery_reduce (mp_int * x, mp_int * n, mp_digit rho) /* Multiply and add in place */ for (iy = 0; iy < n->used; iy++) { /* compute product and sum */ - r = ((mp_word)mu) * ((mp_word)*tmpn++) + - ((mp_word) u) + ((mp_word) * tmpx); + r = ((mp_word)mu * (mp_word)*tmpn++) + + (mp_word) u + (mp_word) *tmpx; /* get carry */ u = (mp_digit)(r >> ((mp_word) DIGIT_BIT)); @@ -85,7 +85,7 @@ mp_montgomery_reduce (mp_int * x, mp_int * n, mp_digit rho) /* propagate carries upwards as required*/ - while (u) { + while (u != 0) { *tmpx += u; u = *tmpx >> DIGIT_BIT; *tmpx++ &= MP_MASK; @@ -112,3 +112,7 @@ mp_montgomery_reduce (mp_int * x, mp_int * n, mp_digit rho) return MP_OKAY; } #endif + +/* $Source$ */ +/* $Revision$ */ +/* $Date$ */ |