Mercurial > dropbear
annotate bn_mp_xor.c @ 201:c0bf626ee437 libtommath
Bringing back the original ltc 0.35 makefile
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Wed, 11 May 2005 16:23:24 +0000 |
| parents | d8254fc979e9 |
| children |
| rev | line source |
|---|---|
| 142 | 1 #include <tommath.h> |
| 2 #ifdef BN_MP_XOR_C | |
| 2 | 3 /* LibTomMath, multiple-precision integer library -- Tom St Denis |
| 4 * | |
| 5 * LibTomMath is a library that provides multiple-precision | |
| 6 * integer arithmetic as well as number theoretic functionality. | |
| 7 * | |
| 8 * The library was designed directly after the MPI library by | |
| 9 * Michael Fromberger but has been written from scratch with | |
| 10 * additional optimizations in place. | |
| 11 * | |
| 12 * The library is free for all purposes without any express | |
| 13 * guarantee it works. | |
| 14 * | |
| 15 * Tom St Denis, [email protected], http://math.libtomcrypt.org | |
| 16 */ | |
| 17 | |
| 18 /* XOR two ints together */ | |
| 19 int | |
| 20 mp_xor (mp_int * a, mp_int * b, mp_int * c) | |
| 21 { | |
| 22 int res, ix, px; | |
| 23 mp_int t, *x; | |
| 24 | |
| 25 if (a->used > b->used) { | |
| 26 if ((res = mp_init_copy (&t, a)) != MP_OKAY) { | |
| 27 return res; | |
| 28 } | |
| 29 px = b->used; | |
| 30 x = b; | |
| 31 } else { | |
| 32 if ((res = mp_init_copy (&t, b)) != MP_OKAY) { | |
| 33 return res; | |
| 34 } | |
| 35 px = a->used; | |
| 36 x = a; | |
| 37 } | |
| 38 | |
| 39 for (ix = 0; ix < px; ix++) { | |
|
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d8254fc979e9
Initial import of libtommath 0.35
Matt Johnston <matt@ucc.asn.au>
parents:
142
diff
changeset
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40 t.dp[ix] ^= x->dp[ix]; |
| 2 | 41 } |
| 42 mp_clamp (&t); | |
| 43 mp_exch (c, &t); | |
| 44 mp_clear (&t); | |
| 45 return MP_OKAY; | |
| 46 } | |
| 142 | 47 #endif |