Mercurial > dropbear

annotate libtommath/bn_mp_exteuclid.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 5ff8218bcee9
children 18154dc469f5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
284
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diff changeset
1 #include <tommath.h>
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diff changeset
2 #ifdef BN_MP_EXTEUCLID_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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diff changeset
8 * The library was designed directly after the MPI library by
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diff changeset
9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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diff changeset
11 *
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12 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
389
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diff changeset
15 * Tom St Denis, [email protected], http://math.libtomcrypt.com
284
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16 */
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17
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18 /* Extended euclidean algorithm of (a, b) produces
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diff changeset
19 a*u1 + b*u2 = u3
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20 */
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diff changeset
21 int mp_exteuclid(mp_int *a, mp_int *b, mp_int *U1, mp_int *U2, mp_int *U3)
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diff changeset
22 {
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diff changeset
23 mp_int u1,u2,u3,v1,v2,v3,t1,t2,t3,q,tmp;
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24 int err;
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25
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diff changeset
26 if ((err = mp_init_multi(&u1, &u2, &u3, &v1, &v2, &v3, &t1, &t2, &t3, &q, &tmp, NULL)) != MP_OKAY) {
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diff changeset
27 return err;
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28 }
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29
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diff changeset
30 /* initialize, (u1,u2,u3) = (1,0,a) */
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31 mp_set(&u1, 1);
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32 if ((err = mp_copy(a, &u3)) != MP_OKAY) { goto _ERR; }
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33
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34 /* initialize, (v1,v2,v3) = (0,1,b) */
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35 mp_set(&v2, 1);
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36 if ((err = mp_copy(b, &v3)) != MP_OKAY) { goto _ERR; }
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37
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diff changeset
38 /* loop while v3 != 0 */
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39 while (mp_iszero(&v3) == MP_NO) {
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40 /* q = u3/v3 */
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41 if ((err = mp_div(&u3, &v3, &q, NULL)) != MP_OKAY) { goto _ERR; }
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42
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43 /* (t1,t2,t3) = (u1,u2,u3) - (v1,v2,v3)q */
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44 if ((err = mp_mul(&v1, &q, &tmp)) != MP_OKAY) { goto _ERR; }
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45 if ((err = mp_sub(&u1, &tmp, &t1)) != MP_OKAY) { goto _ERR; }
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46 if ((err = mp_mul(&v2, &q, &tmp)) != MP_OKAY) { goto _ERR; }
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47 if ((err = mp_sub(&u2, &tmp, &t2)) != MP_OKAY) { goto _ERR; }
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diff changeset
48 if ((err = mp_mul(&v3, &q, &tmp)) != MP_OKAY) { goto _ERR; }
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diff changeset
49 if ((err = mp_sub(&u3, &tmp, &t3)) != MP_OKAY) { goto _ERR; }
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50
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51 /* (u1,u2,u3) = (v1,v2,v3) */
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diff changeset
52 if ((err = mp_copy(&v1, &u1)) != MP_OKAY) { goto _ERR; }
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diff changeset
53 if ((err = mp_copy(&v2, &u2)) != MP_OKAY) { goto _ERR; }
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diff changeset
54 if ((err = mp_copy(&v3, &u3)) != MP_OKAY) { goto _ERR; }
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55
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56 /* (v1,v2,v3) = (t1,t2,t3) */
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57 if ((err = mp_copy(&t1, &v1)) != MP_OKAY) { goto _ERR; }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
58 if ((err = mp_copy(&t2, &v2)) != MP_OKAY) { goto _ERR; }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
59 if ((err = mp_copy(&t3, &v3)) != MP_OKAY) { goto _ERR; }
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60 }
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61
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parents:
diff changeset
62 /* make sure U3 >= 0 */
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diff changeset
63 if (u3.sign == MP_NEG) {
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parents:
diff changeset
64 mp_neg(&u1, &u1);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
65 mp_neg(&u2, &u2);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
66 mp_neg(&u3, &u3);
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67 }
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68
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diff changeset
69 /* copy result out */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
70 if (U1 != NULL) { mp_exch(U1, &u1); }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
71 if (U2 != NULL) { mp_exch(U2, &u2); }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
72 if (U3 != NULL) { mp_exch(U3, &u3); }
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Matt Johnston <matt@ucc.asn.au>
parents:
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73
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
74 err = MP_OKAY;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
75 _ERR: mp_clear_multi(&u1, &u2, &u3, &v1, &v2, &v3, &t1, &t2, &t3, &q, &tmp, NULL);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
76 return err;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
77 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
78 #endif
389
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Matt Johnston <matt@ucc.asn.au>
parents: 284
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79
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Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
80 /* $Source: /cvs/libtom/libtommath/bn_mp_exteuclid.c,v $ */
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Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
81 /* $Revision: 1.3 $ */
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Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
82 /* $Date: 2006/03/31 14:18:44 $ */