tommath/bn_mp_xor.c

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#include <tommath_private.h>
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#ifdef BN_MP_XOR_C
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/* LibTomMath, multiple-precision integer library -- Tom St Denis
*
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* LibTomMath is a library that provides multiple-precision
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* integer arithmetic as well as number theoretic functionality.
*
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* The library was designed directly after the MPI library by
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* 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, tstdenis82@gmail.com, http://libtom.org
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*/
/* XOR two ints together */
int mp_xor (mp_int * a, mp_int * b, mp_int * c)
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{
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int res, ix, px;
mp_int t, *x;
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if (a->used > b->used) {
if ((res = mp_init_copy(&t, a)) != MP_OKAY) {
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return res;
}
px = b->used;
x = b;
} else {
if ((res = mp_init_copy(&t, b)) != MP_OKAY) {
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return res;
}
px = a->used;
x = a;
}
for (ix = 0; ix < px; ix++) {
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t.dp[ix] ^= x->dp[ix];
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}
mp_clamp(&t);
mp_exch(c, &t);
mp_clear(&t);
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return MP_OKAY;
}
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#endif
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