1+ /*
2+ * Copyright (c) 2015 Damien Miller <[email protected] > 3+ *
4+ * Permission to use, copy, modify, and distribute this software for any
5+ * purpose with or without fee is hereby granted, provided that the above
6+ * copyright notice and this permission notice appear in all copies.
7+ *
8+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15+ */
16+
17+ #include <includes.h>
18+
19+
20+ #include <sys/types.h>
21+ #include <stdio.h>
22+ #include <stdlib.h>
23+ #include <string.h>
24+ #include <limits.h>
25+
26+
27+ #include <openssl/bn.h>
28+ #include <openssl/ec.h>
29+
30+
31+ #include "sshbuf.h"
32+ #include "packet.h"
33+ #include "ssherr.h"
34+ #include "crypto-wrap.h"
35+
36+ struct sshepoint {
37+ EC_POINT * pt ;
38+ EC_GROUP * gp ;
39+ };
40+
41+ struct sshecurve {
42+ EC_GROUP * gp ;
43+ };
44+
45+
46+ struct sshepoint *
47+ sshepoint_new (void )
48+ {
49+ return malloc (sizeof (struct sshepoint ));
50+ }
51+
52+ void
53+ sshepoint_free (struct sshepoint * pt )
54+ {
55+ if (pt != NULL ) {
56+ if (pt -> pt != NULL )
57+ EC_POINT_free (pt -> pt );
58+ if (pt -> gp != NULL )
59+ EC_GROUP_free (pt -> gp );
60+ explicit_bzero (pt , sizeof (* pt ));
61+ free (pt );
62+ }
63+ }
64+
65+
66+ int sshepoint_from (struct sshbn * x , struct sshbn * y , struct sshecurve * curve , struct sshepoint * * retp )
67+ {
68+ struct sshepoint * ret = NULL ;
69+
70+
71+ * retp = NULL ;
72+ if ((ret = sshepoint_new ()) == NULL )
73+ {
74+ return SSH_ERR_ALLOC_FAIL ;
75+ }
76+ if ((ret -> pt = EC_POINT_new (curve -> gp )) == NULL )
77+ {
78+ sshepoint_free (ret );
79+ return SSH_ERR_LIBCRYPTO_ERROR ;
80+ }
81+ ret -> gp = curve -> gp ;
82+ if (EC_POINT_set_affine_corrdinates_GFp (curve -> gp , ret -> pt , x , y )) {
83+ sshepoint_free (ret );
84+ return SSH_ERR_LIBCRYPTO_ERROR ;
85+ }
86+ * retp = ret ;
87+ return 0 ;
88+ }
89+ int sshepoint_to (struct sshepoint * pt , struct sshbn * * retx , struct sshbn * * rety , struct sshecurve * * retcurve )
90+ {
91+ struct sshbn * x = NULL ;
92+ struct sshbn * y = NULL ;
93+ struct sshecurve * curve = NULL ;
94+
95+ if (((x = sshbn_new ()) == NULL ) ||
96+ ((y = sshbn_new ()) == NULL ) ||
97+ ((curve = sshecurve_new ()) == NULL ))
98+ {
99+ sshbn_free (x );
100+ sshbn_free (y );
101+ sshecurve_free (curve );
102+ return SSH_ERR_ALLOC_FAIL ;
103+ }
104+
105+ curve -> gp = pt -> gp ;
106+ if (EC_POINT_get_affine_coordinates_GFp (pt -> gp , pt -> pt , sshbn_bignum (x ), sshbn_bignum (y ), NULL ))
107+ {
108+ sshecurve_free (curve );
109+ sshbn_free (x );
110+ sshbn_free (y );
111+ return SSH_ERR_LIBCRYPTO_ERROR ;
112+ }
113+ * retcurve = curve ;
114+ * retx = x ;
115+ * rety = y ;
116+
117+ return 0 ;
118+ }
119+
120+ struct sshecurve * sshecurve_new (void )
121+ {
122+ struct sshecurve * curve = NULL ;
123+
124+ curve = (struct sshecurve * )malloc (sizeof (struct sshecurve ));
125+ memset (curve , 0 , sizeof (struct sshecurve ));
126+
127+ return curve ;
128+ }
129+
130+ void sshecurve_free (struct sshecurve * curve )
131+ {
132+ if (curve != NULL ) {
133+ if (curve -> gp != NULL )
134+ EC_GROUP_free (curve -> gp );
135+ explicit_bzero (curve , sizeof (* curve ));
136+ free (curve );
137+ }
138+ }
139+
140+ struct sshecurve * sshecurve_new_curve (int nid )
141+ {
142+ struct sshecurve * ret ;
143+
144+ if ((ret = sshecurve_new ()) == NULL )
145+ return NULL ;
146+ ret -> gp = EC_GROUP_new_by_curve_name (nid );
147+
148+ return ret ;
149+
150+
151+ }
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