nettle  3.7.3
About: Nettle is a low-level cryptographic library.
  Fossies Dox: nettle-3.7.3.tar.gz  ("unofficial" and yet experimental doxygen-generated source code documentation)  

sexp2rsa.c
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1 /* sexp2rsa.c
2 
3  Copyright (C) 2002 Niels Möller
4 
5  This file is part of GNU Nettle.
6 
7  GNU Nettle is free software: you can redistribute it and/or
8  modify it under the terms of either:
9 
10  * the GNU Lesser General Public License as published by the Free
11  Software Foundation; either version 3 of the License, or (at your
12  option) any later version.
13 
14  or
15 
16  * the GNU General Public License as published by the Free
17  Software Foundation; either version 2 of the License, or (at your
18  option) any later version.
19 
20  or both in parallel, as here.
21 
22  GNU Nettle is distributed in the hope that it will be useful,
23  but WITHOUT ANY WARRANTY; without even the implied warranty of
24  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25  General Public License for more details.
26 
27  You should have received copies of the GNU General Public License and
28  the GNU Lesser General Public License along with this program. If
29  not, see http://www.gnu.org/licenses/.
30 */
31 
32 #if HAVE_CONFIG_H
33 # include "config.h"
34 #endif
35 
36 #include <string.h>
37 
38 #include "rsa.h"
39 
40 #include "bignum.h"
41 #include "sexp.h"
42 
43 #define GET(x, l, v) \
44 do { \
45  if (!nettle_mpz_set_sexp((x), (l), (v)) \
46  || mpz_sgn(x) <= 0) \
47  return 0; \
48 } while(0)
49 
50 /* Iterator should point past the algorithm tag, e.g.
51  *
52  * (public-key (rsa (n |xxxx|) (e |xxxx|))
53  * ^ here
54  */
55 
56 int
58  struct rsa_private_key *priv,
59  unsigned limit,
60  struct sexp_iterator *i)
61 {
62  static const char * const names[8]
63  = { "n", "e", "d", "p", "q", "a", "b", "c" };
64  struct sexp_iterator values[8];
65  unsigned nvalues = priv ? 8 : 2;
66 
67  if (!sexp_iterator_assoc(i, nvalues, names, values))
68  return 0;
69 
70  if (priv)
71  {
72  GET(priv->d, limit, &values[2]);
73  GET(priv->p, limit, &values[3]);
74  GET(priv->q, limit, &values[4]);
75  GET(priv->a, limit, &values[5]);
76  GET(priv->b, limit, &values[6]);
77  GET(priv->c, limit, &values[7]);
78 
79  if (!rsa_private_key_prepare(priv))
80  return 0;
81  }
82 
83  if (pub)
84  {
85  GET(pub->n, limit, &values[0]);
86  GET(pub->e, limit, &values[1]);
87 
88  if (!rsa_public_key_prepare(pub))
89  return 0;
90  }
91 
92  return 1;
93 }
94 
95 int
97  struct rsa_private_key *priv,
98  unsigned limit,
99  size_t length, const uint8_t *expr)
100 {
101  struct sexp_iterator i;
102  static const char * const names[3]
103  = { "rsa", "rsa-pkcs1", "rsa-pkcs1-sha1" };
104 
105  if (!sexp_iterator_first(&i, length, expr))
106  return 0;
107 
108  if (!sexp_iterator_check_type(&i, priv ? "private-key" : "public-key"))
109  return 0;
110 
111  if (!sexp_iterator_check_types(&i, 3, names))
112  return 0;
113 
114  return rsa_keypair_from_sexp_alist(pub, priv, limit, &i);
115 }
#define i
#define rsa_keypair_from_sexp_alist
Definition: rsa.h:96
#define rsa_keypair_from_sexp
Definition: rsa.h:97
#define rsa_private_key_prepare
Definition: rsa.h:54
#define rsa_public_key_prepare
Definition: rsa.h:51
#define GET(x, l, v)
Definition: sexp2rsa.c:43
#define sexp_iterator_check_type
Definition: sexp.h:51
#define sexp_iterator_first
Definition: sexp.h:44
#define sexp_iterator_check_types
Definition: sexp.h:52
#define sexp_iterator_assoc
Definition: sexp.h:53
mpz_t p
Definition: rsa.h:136
mpz_t d
Definition: rsa.h:133
mpz_t c
Definition: rsa.h:145
mpz_t a
Definition: rsa.h:139
mpz_t q
Definition: rsa.h:136
mpz_t b
Definition: rsa.h:142
mpz_t e
Definition: rsa.h:124
mpz_t n
Definition: rsa.h:121
size_t length
Definition: sexp.h:65