annotate libtommath/bn_mp_gcd.c @ 1653:76189c9ffea2

External Public-Key Authentication API (#72) * Implemented dynamic loading of an external plug-in shared library to delegate public key authentication * Moved conditional compilation of the plugin infrastructure into the configure.ac script to be able to add -ldl to dropbear build only when the flag is enabled * Added tags file to the ignore list * Updated API to have the constructor to return function pointers in the pliugin instance. Added support for passing user name to the checkpubkey function. Added options to the session returned by the plugin and have dropbear to parse and process them * Added -rdynamic to the linker flags when EPKA is enabled * Changed the API to pass a previously created session to the checkPubKey function (created during preauth) * Added documentation to the API * Added parameter addrstring to plugin creation function * Modified the API to retrieve the auth options. Instead of having them as field of the EPKASession struct, they are stored internally (plugin-dependent) in the plugin/session and retrieved through a pointer to a function (in the session) * Changed option string to be a simple char * instead of unsigned char *
author fabriziobertocci <fabriziobertocci@gmail.com>
date Wed, 15 May 2019 09:43:57 -0400
parents 8bba51a55704
children f52919ffd3b1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1436
60fc6476e044 Update to libtommath v1.0
Matt Johnston <matt@ucc.asn.au>
parents: 389
diff changeset
1 #include <tommath_private.h>
284
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diff changeset
2 #ifdef BN_MP_GCD_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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diff changeset
4 *
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diff changeset
5 * LibTomMath is a library that provides multiple-precision
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diff changeset
6 * integer arithmetic as well as number theoretic functionality.
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diff changeset
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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diff changeset
10 * additional optimizations in place.
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diff changeset
11 *
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diff changeset
12 * The library is free for all purposes without any express
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diff changeset
13 * guarantee it works.
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parents:
diff changeset
14 *
1436
60fc6476e044 Update to libtommath v1.0
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diff changeset
15 * Tom St Denis, [email protected], http://libtom.org
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16 */
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17
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diff changeset
18 /* Greatest Common Divisor using the binary method */
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diff changeset
19 int mp_gcd (mp_int * a, mp_int * b, mp_int * c)
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diff changeset
20 {
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diff changeset
21 mp_int u, v;
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diff changeset
22 int k, u_lsb, v_lsb, res;
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23
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
24 /* either zero than gcd is the largest */
389
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Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
25 if (mp_iszero (a) == MP_YES) {
284
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
26 return mp_abs (b, c);
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27 }
389
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Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
28 if (mp_iszero (b) == MP_YES) {
284
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diff changeset
29 return mp_abs (a, c);
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30 }
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31
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
32 /* get copies of a and b we can modify */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
33 if ((res = mp_init_copy (&u, a)) != MP_OKAY) {
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Matt Johnston <matt@ucc.asn.au>
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34 return res;
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35 }
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
36
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
37 if ((res = mp_init_copy (&v, b)) != MP_OKAY) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
38 goto LBL_U;
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Matt Johnston <matt@ucc.asn.au>
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39 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
40
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
41 /* must be positive for the remainder of the algorithm */
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diff changeset
42 u.sign = v.sign = MP_ZPOS;
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43
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diff changeset
44 /* B1. Find the common power of two for u and v */
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Matt Johnston <matt@ucc.asn.au>
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45 u_lsb = mp_cnt_lsb(&u);
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diff changeset
46 v_lsb = mp_cnt_lsb(&v);
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diff changeset
47 k = MIN(u_lsb, v_lsb);
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48
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
49 if (k > 0) {
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diff changeset
50 /* divide the power of two out */
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diff changeset
51 if ((res = mp_div_2d(&u, k, &u, NULL)) != MP_OKAY) {
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
52 goto LBL_V;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
53 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
54
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
55 if ((res = mp_div_2d(&v, k, &v, NULL)) != MP_OKAY) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
56 goto LBL_V;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
57 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
58 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
59
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
60 /* divide any remaining factors of two out */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
61 if (u_lsb != k) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
62 if ((res = mp_div_2d(&u, u_lsb - k, &u, NULL)) != MP_OKAY) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
63 goto LBL_V;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
64 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
65 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
66
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
67 if (v_lsb != k) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
68 if ((res = mp_div_2d(&v, v_lsb - k, &v, NULL)) != MP_OKAY) {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
69 goto LBL_V;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
70 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
71 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
72
1436
60fc6476e044 Update to libtommath v1.0
Matt Johnston <matt@ucc.asn.au>
parents: 389
diff changeset
73 while (mp_iszero(&v) == MP_NO) {
284
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
74 /* make sure v is the largest */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
75 if (mp_cmp_mag(&u, &v) == MP_GT) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
76 /* swap u and v to make sure v is >= u */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
77 mp_exch(&u, &v);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
78 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
79
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80 /* subtract smallest from largest */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
81 if ((res = s_mp_sub(&v, &u, &v)) != MP_OKAY) {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
82 goto LBL_V;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
83 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85 /* Divide out all factors of two */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 if ((res = mp_div_2d(&v, mp_cnt_lsb(&v), &v, NULL)) != MP_OKAY) {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 goto LBL_V;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 /* multiply by 2**k which we divided out at the beginning */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 if ((res = mp_mul_2d (&u, k, c)) != MP_OKAY) {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 goto LBL_V;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 c->sign = MP_ZPOS;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 res = MP_OKAY;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 LBL_V:mp_clear (&u);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 LBL_U:mp_clear (&v);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 return res;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 #endif
389
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
102
1470
8bba51a55704 Update to libtommath v1.0.1
Matt Johnston <matt@ucc.asn.au>
parents: 1436
diff changeset
103 /* ref: $Format:%D$ */
8bba51a55704 Update to libtommath v1.0.1
Matt Johnston <matt@ucc.asn.au>
parents: 1436
diff changeset
104 /* git commit: $Format:%H$ */
8bba51a55704 Update to libtommath v1.0.1
Matt Johnston <matt@ucc.asn.au>
parents: 1436
diff changeset
105 /* commit time: $Format:%ai$ */