#include <tommath.h>
#ifdef BN_S_MP_EXPTMOD_C
#ifdef MP_LOW_MEM
#define TAB_SIZE 32
#else
#define TAB_SIZE 256
#endif
int s_mp_exptmod (mp_int * G, mp_int * X, mp_int * P, mp_int * Y, int redmode)
{
mp_int M[TAB_SIZE], res, mu;
mp_digit buf;
int err, bitbuf, bitcpy, bitcnt, mode, digidx, x, y, winsize;
int (*redux)(mp_int*,mp_int*,mp_int*);
x = mp_count_bits (X);
if (x <= 7) {
winsize = 2;
} else if (x <= 36) {
winsize = 3;
} else if (x <= 140) {
winsize = 4;
} else if (x <= 450) {
winsize = 5;
} else if (x <= 1303) {
winsize = 6;
} else if (x <= 3529) {
winsize = 7;
} else {
winsize = 8;
}
#ifdef MP_LOW_MEM
if (winsize > 5) {
winsize = 5;
}
#endif
if ((err = mp_init(&M[1])) != MP_OKAY) {
return err;
}
for (x = 1<<(winsize-1); x < (1 << winsize); x++) {
if ((err = mp_init(&M[x])) != MP_OKAY) {
for (y = 1<<(winsize-1); y < x; y++) {
mp_clear (&M[y]);
}
mp_clear(&M[1]);
return err;
}
}
if ((err = mp_init (&mu)) != MP_OKAY) {
goto LBL_M;
}
if (redmode == 0) {
if ((err = mp_reduce_setup (&mu, P)) != MP_OKAY) {
goto LBL_MU;
}
redux = mp_reduce;
} else {
if ((err = mp_reduce_2k_setup_l (P, &mu)) != MP_OKAY) {
goto LBL_MU;
}
redux = mp_reduce_2k_l;
}
if ((err = mp_mod (G, P, &M[1])) != MP_OKAY) {
goto LBL_MU;
}
if ((err = mp_copy (&M[1], &M[1 << (winsize - 1)])) != MP_OKAY) {
goto LBL_MU;
}
for (x = 0; x < (winsize - 1); x++) {
if ((err = mp_sqr (&M[1 << (winsize - 1)],
&M[1 << (winsize - 1)])) != MP_OKAY) {
goto LBL_MU;
}
if ((err = redux (&M[1 << (winsize - 1)], P, &mu)) != MP_OKAY) {
goto LBL_MU;
}
}
for (x = (1 << (winsize - 1)) + 1; x < (1 << winsize); x++) {
if ((err = mp_mul (&M[x - 1], &M[1], &M[x])) != MP_OKAY) {
goto LBL_MU;
}
if ((err = redux (&M[x], P, &mu)) != MP_OKAY) {
goto LBL_MU;
}
}
if ((err = mp_init (&res)) != MP_OKAY) {
goto LBL_MU;
}
mp_set (&res, 1);
mode = 0;
bitcnt = 1;
buf = 0;
digidx = X->used - 1;
bitcpy = 0;
bitbuf = 0;
for (;;) {
if (--bitcnt == 0) {
if (digidx == -1) {
break;
}
buf = X->dp[digidx--];
bitcnt = (int) DIGIT_BIT;
}
y = (buf >> (mp_digit)(DIGIT_BIT - 1)) & 1;
buf <<= (mp_digit)1;
if (mode == 0 && y == 0) {
continue;
}
if (mode == 1 && y == 0) {
if ((err = mp_sqr (&res, &res)) != MP_OKAY) {
goto LBL_RES;
}
if ((err = redux (&res, P, &mu)) != MP_OKAY) {
goto LBL_RES;
}
continue;
}
bitbuf |= (y << (winsize - ++bitcpy));
mode = 2;
if (bitcpy == winsize) {
for (x = 0; x < winsize; x++) {
if ((err = mp_sqr (&res, &res)) != MP_OKAY) {
goto LBL_RES;
}
if ((err = redux (&res, P, &mu)) != MP_OKAY) {
goto LBL_RES;
}
}
if ((err = mp_mul (&res, &M[bitbuf], &res)) != MP_OKAY) {
goto LBL_RES;
}
if ((err = redux (&res, P, &mu)) != MP_OKAY) {
goto LBL_RES;
}
bitcpy = 0;
bitbuf = 0;
mode = 1;
}
}
if (mode == 2 && bitcpy > 0) {
for (x = 0; x < bitcpy; x++) {
if ((err = mp_sqr (&res, &res)) != MP_OKAY) {
goto LBL_RES;
}
if ((err = redux (&res, P, &mu)) != MP_OKAY) {
goto LBL_RES;
}
bitbuf <<= 1;
if ((bitbuf & (1 << winsize)) != 0) {
if ((err = mp_mul (&res, &M[1], &res)) != MP_OKAY) {
goto LBL_RES;
}
if ((err = redux (&res, P, &mu)) != MP_OKAY) {
goto LBL_RES;
}
}
}
}
mp_exch (&res, Y);
err = MP_OKAY;
LBL_RES:mp_clear (&res);
LBL_MU:mp_clear (&mu);
LBL_M:
mp_clear(&M[1]);
for (x = 1<<(winsize-1); x < (1 << winsize); x++) {
mp_clear (&M[x]);
}
return err;
}
#endif