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)  

rsa2openpgp.c
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1 /* rsa2openpgp.c
2 
3  Converting rsa keys to OpenPGP format.
4 
5  Copyright (C) 2001, 2002 Niels Möller
6 
7  This file is part of GNU Nettle.
8 
9  GNU Nettle is free software: you can redistribute it and/or
10  modify it under the terms of either:
11 
12  * the GNU Lesser General Public License as published by the Free
13  Software Foundation; either version 3 of the License, or (at your
14  option) any later version.
15 
16  or
17 
18  * the GNU General Public License as published by the Free
19  Software Foundation; either version 2 of the License, or (at your
20  option) any later version.
21 
22  or both in parallel, as here.
23 
24  GNU Nettle is distributed in the hope that it will be useful,
25  but WITHOUT ANY WARRANTY; without even the implied warranty of
26  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
27  General Public License for more details.
28 
29  You should have received copies of the GNU General Public License and
30  the GNU Lesser General Public License along with this program. If
31  not, see http://www.gnu.org/licenses/.
32 */
33 
34 #if HAVE_CONFIG_H
35 # include "config.h"
36 #endif
37 
38 #include <string.h>
39 #include <time.h>
40 
41 #include "rsa.h"
42 
43 #include "buffer.h"
44 #include "pgp.h"
45 
46 
47 /* According to RFC 2440, a public key consists of the following packets:
48  *
49  * Public key packet
50  *
51  * Zero or more revocation signatures
52  *
53  * One or more User ID packets
54  *
55  * After each User ID packet, zero or more signature packets
56  *
57  * Zero or more Subkey packets
58  *
59  * After each Subkey packet, one signature packet, optionally a
60  * revocation.
61  *
62  * Currently, we generate a public key packet, a single user id, and a
63  * signature. */
64 
65 int
67  const struct rsa_public_key *pub,
68  const struct rsa_private_key *priv,
69  /* A single user id. NUL-terminated utf8. */
70  const char *userid)
71 {
72  time_t now = time(NULL);
73 
74  unsigned key_start;
75  unsigned userid_start;
76 
77  struct sha1_ctx key_hash;
78  struct sha1_ctx signature_hash;
79  uint8_t fingerprint[SHA1_DIGEST_SIZE];
80 
81  key_start = buffer->size;
82 
83  if (!pgp_put_public_rsa_key(buffer, pub, now))
84  return 0;
85 
86  /* userid packet */
87  userid_start = buffer->size;
88  if (!pgp_put_userid(buffer, strlen(userid), (const uint8_t *) userid))
89  return 0;
90 
91  /* FIXME: We hash the key first, and then the user id. Is this right? */
92  sha1_init(&key_hash);
93  sha1_update(&key_hash,
94  userid_start - key_start,
95  buffer->contents + key_start);
96 
97  signature_hash = key_hash;
98  sha1_digest(&key_hash, sizeof(fingerprint), fingerprint);
99 
100  sha1_update(&signature_hash,
101  buffer->size - userid_start,
102  buffer->contents + userid_start);
103 
104  return pgp_put_rsa_sha1_signature(buffer,
105  priv,
106  fingerprint + SHA1_DIGEST_SIZE - 8,
108  &signature_hash);
109 }
#define NULL
Definition: getopt1.c:58
#define pgp_put_userid
Definition: pgp.h:59
#define pgp_put_public_rsa_key
Definition: pgp.h:57
#define pgp_put_rsa_sha1_signature
Definition: pgp.h:58
@ PGP_SIGN_CERTIFICATION
Definition: pgp.h:207
#define rsa_keypair_to_openpgp
Definition: rsa.h:101
#define SHA1_DIGEST_SIZE
Definition: sha1.h:50
#define sha1_init
Definition: sha1.h:44
#define sha1_digest
Definition: sha1.h:46
#define sha1_update
Definition: sha1.h:45
uint8_t * contents
Definition: buffer.h:45
size_t size
Definition: buffer.h:53
Definition: sha1.h:59