Mercurial > dropbear

annotate libtommath/bn_mp_exteuclid.c @ 1938:77bc00dcc19f default tip main master

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Bump version to 2022.82
author Matt Johnston <matt@ucc.asn.au>
date Fri, 01 Apr 2022 14:43:27 +0800
parents 1051e4eea25a
children
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rev   line source
1655
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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parents: 1470
diff changeset
1 #include "tommath_private.h"
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2 #ifdef BN_MP_EXTEUCLID_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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4 /* SPDX-License-Identifier: Unlicense */
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5
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6 /* Extended euclidean algorithm of (a, b) produces
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7 a*u1 + b*u2 = u3
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8 */
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9 mp_err mp_exteuclid(const mp_int *a, const mp_int *b, mp_int *U1, mp_int *U2, mp_int *U3)
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10 {
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11 mp_int u1, u2, u3, v1, v2, v3, t1, t2, t3, q, tmp;
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12 mp_err err;
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13
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14 if ((err = mp_init_multi(&u1, &u2, &u3, &v1, &v2, &v3, &t1, &t2, &t3, &q, &tmp, NULL)) != MP_OKAY) {
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15 return err;
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16 }
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18 /* initialize, (u1,u2,u3) = (1,0,a) */
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19 mp_set(&u1, 1uL);
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20 if ((err = mp_copy(a, &u3)) != MP_OKAY) goto LBL_ERR;
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21
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22 /* initialize, (v1,v2,v3) = (0,1,b) */
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23 mp_set(&v2, 1uL);
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24 if ((err = mp_copy(b, &v3)) != MP_OKAY) goto LBL_ERR;
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25
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26 /* loop while v3 != 0 */
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27 while (!MP_IS_ZERO(&v3)) {
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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parents: 1470
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28 /* q = u3/v3 */
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29 if ((err = mp_div(&u3, &v3, &q, NULL)) != MP_OKAY) goto LBL_ERR;
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30
1655
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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31 /* (t1,t2,t3) = (u1,u2,u3) - (v1,v2,v3)q */
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32 if ((err = mp_mul(&v1, &q, &tmp)) != MP_OKAY) goto LBL_ERR;
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33 if ((err = mp_sub(&u1, &tmp, &t1)) != MP_OKAY) goto LBL_ERR;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents: 1655
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34 if ((err = mp_mul(&v2, &q, &tmp)) != MP_OKAY) goto LBL_ERR;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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35 if ((err = mp_sub(&u2, &tmp, &t2)) != MP_OKAY) goto LBL_ERR;
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36 if ((err = mp_mul(&v3, &q, &tmp)) != MP_OKAY) goto LBL_ERR;
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37 if ((err = mp_sub(&u3, &tmp, &t3)) != MP_OKAY) goto LBL_ERR;
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38
1655
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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39 /* (u1,u2,u3) = (v1,v2,v3) */
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1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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40 if ((err = mp_copy(&v1, &u1)) != MP_OKAY) goto LBL_ERR;
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parents: 1655
diff changeset
41 if ((err = mp_copy(&v2, &u2)) != MP_OKAY) goto LBL_ERR;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents: 1655
diff changeset
42 if ((err = mp_copy(&v3, &u3)) != MP_OKAY) goto LBL_ERR;
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43
1655
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44 /* (v1,v2,v3) = (t1,t2,t3) */
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45 if ((err = mp_copy(&t1, &v1)) != MP_OKAY) goto LBL_ERR;
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diff changeset
46 if ((err = mp_copy(&t2, &v2)) != MP_OKAY) goto LBL_ERR;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents: 1655
diff changeset
47 if ((err = mp_copy(&t3, &v3)) != MP_OKAY) goto LBL_ERR;
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48 }
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49
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diff changeset
50 /* make sure U3 >= 0 */
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diff changeset
51 if (u3.sign == MP_NEG) {
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diff changeset
52 if ((err = mp_neg(&u1, &u1)) != MP_OKAY) goto LBL_ERR;
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diff changeset
53 if ((err = mp_neg(&u2, &u2)) != MP_OKAY) goto LBL_ERR;
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parents: 1655
diff changeset
54 if ((err = mp_neg(&u3, &u3)) != MP_OKAY) goto LBL_ERR;
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55 }
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56
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57 /* copy result out */
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diff changeset
58 if (U1 != NULL) {
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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diff changeset
59 mp_exch(U1, &u1);
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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60 }
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
61 if (U2 != NULL) {
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
62 mp_exch(U2, &u2);
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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parents: 1470
diff changeset
63 }
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
64 if (U3 != NULL) {
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
65 mp_exch(U3, &u3);
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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parents: 1470
diff changeset
66 }
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67
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68 err = MP_OKAY;
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8bba51a55704 Update to libtommath v1.0.1
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69 LBL_ERR:
8bba51a55704 Update to libtommath v1.0.1
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70 mp_clear_multi(&u1, &u2, &u3, &v1, &v2, &v3, &t1, &t2, &t3, &q, &tmp, NULL);
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71 return err;
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72 }
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73 #endif