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-rw-r--r--src/credential/credential_misc.c168
-rw-r--r--src/credential/credential_misc.h35
2 files changed, 203 insertions, 0 deletions
diff --git a/src/credential/credential_misc.c b/src/credential/credential_misc.c
new file mode 100644
index 000000000..f1be433e0
--- /dev/null
+++ b/src/credential/credential_misc.c
@@ -0,0 +1,168 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2009-2013, 2016 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20
21
22/**
23 * @file credential/credential_mic.c
24 * @brief Misc API for credentials
25 *
26 * @author Martin Schanzenbach
27 */
28#include "platform.h"
29#include "gnunet_util_lib.h"
30#include "gnunet_constants.h"
31#include "gnunet_credential_service.h"
32#include "gnunet_signatures.h"
33#include "credential.h"
34#include <inttypes.h>
35
36char*
37GNUNET_CREDENTIAL_credential_to_string (const struct GNUNET_CREDENTIAL_Credential *cred)
38{
39 char *cred_str;
40 char *subject_pkey;
41 char *issuer_pkey;
42 char *signature;
43
44
45 subject_pkey = GNUNET_CRYPTO_ecdsa_public_key_to_string (&cred->subject_key);
46 issuer_pkey = GNUNET_CRYPTO_ecdsa_public_key_to_string (&cred->issuer_key);
47 GNUNET_STRINGS_base64_encode ((char*)&cred->signature,
48 sizeof (struct GNUNET_CRYPTO_EcdsaSignature),
49 &signature);
50 GNUNET_asprintf (&cred_str,
51 "%s.%s -> %s | %s | %"SCNu64,
52 issuer_pkey,
53 cred->issuer_attribute,
54 subject_pkey,
55 signature,
56 cred->expiration.abs_value_us);
57 GNUNET_free (subject_pkey);
58 GNUNET_free (issuer_pkey);
59 GNUNET_free (signature);
60 return cred_str;
61}
62
63struct GNUNET_CREDENTIAL_Credential*
64GNUNET_CREDENTIAL_credential_from_string (const char* s)
65{
66 struct GNUNET_CREDENTIAL_Credential *cred;
67 size_t enclen = (sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey)) * 8;
68 if (enclen % 5 > 0)
69 enclen += 5 - enclen % 5;
70 enclen /= 5; /* 260/5 = 52 */
71 char subject_pkey[enclen + 1];
72 char issuer_pkey[enclen + 1];
73 char name[253 + 1];
74 char signature[256]; //TODO max payload size
75
76 struct GNUNET_CRYPTO_EcdsaSignature *sig;
77 struct GNUNET_TIME_Absolute etime_abs;
78
79 if (5 != SSCANF (s,
80 "%52s.%253s -> %52s | %s | %"SCNu64,
81 issuer_pkey,
82 name,
83 subject_pkey,
84 signature,
85 &etime_abs.abs_value_us))
86 {
87 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
88 _("Unable to parse CRED record string `%s'\n"),
89 s);
90 return NULL;
91 }
92 cred = GNUNET_malloc (sizeof (struct GNUNET_CREDENTIAL_Credential) + strlen (name) + 1);
93 GNUNET_CRYPTO_ecdsa_public_key_from_string (subject_pkey,
94 strlen (subject_pkey),
95 &cred->subject_key);
96 GNUNET_CRYPTO_ecdsa_public_key_from_string (issuer_pkey,
97 strlen (issuer_pkey),
98 &cred->issuer_key);
99 GNUNET_assert (sizeof (struct GNUNET_CRYPTO_EcdsaSignature) == GNUNET_STRINGS_base64_decode (signature,
100 strlen (signature),
101 (char**)&sig));
102 cred->signature = *sig;
103 cred->expiration = etime_abs;
104 GNUNET_free (sig);
105 GNUNET_memcpy (&cred[1],
106 name,
107 strlen (name)+1);
108 cred->issuer_attribute = (char*)&cred[1];
109 return cred;
110}
111
112/**
113 * Issue an attribute to a subject
114 *
115 * @param handle handle to the Credential service
116 * @param issuer the ego that should be used to issue the attribute
117 * @param subject the subject of the attribute
118 * @param attribute the name of the attribute
119 * @return handle to the queued request
120 */
121struct GNUNET_CREDENTIAL_Credential *
122GNUNET_CREDENTIAL_credential_issue (const struct GNUNET_CRYPTO_EcdsaPrivateKey *issuer,
123 struct GNUNET_CRYPTO_EcdsaPublicKey *subject,
124 const char *attribute,
125 struct GNUNET_TIME_Absolute *expiration)
126{
127 struct CredentialEntry *crd;
128 struct GNUNET_CREDENTIAL_Credential *cred;
129 size_t size;
130
131 size = sizeof (struct CredentialEntry) + strlen (attribute) + 1;
132 crd = GNUNET_malloc (size);
133 cred = GNUNET_malloc (sizeof (struct GNUNET_CREDENTIAL_Credential) + strlen (attribute) + 1);
134 crd->purpose.size = htonl (size - sizeof (struct GNUNET_CRYPTO_EcdsaSignature));
135
136 crd->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_CREDENTIAL);
137 GNUNET_CRYPTO_ecdsa_key_get_public (issuer,
138 &crd->issuer_key);
139 crd->subject_key = *subject;
140 crd->expiration = GNUNET_htonll (expiration->abs_value_us);
141 crd->issuer_attribute_len = htonl (strlen (attribute)+1);
142 GNUNET_memcpy ((char*)&crd[1],
143 attribute,
144 strlen (attribute)+1);
145 if (GNUNET_OK !=
146 GNUNET_CRYPTO_ecdsa_sign (issuer,
147 &crd->purpose,
148 &crd->signature))
149 {
150 GNUNET_break (0);
151 GNUNET_free (crd);
152 return NULL;
153 }
154 cred->signature = crd->signature;
155 cred->expiration = *expiration;
156 GNUNET_CRYPTO_ecdsa_key_get_public (issuer,
157 &cred->issuer_key);
158
159 cred->subject_key = *subject;
160 GNUNET_memcpy (&cred[1],
161 attribute,
162 strlen (attribute)+1);
163 cred->issuer_attribute = (char*)&cred[1];
164 GNUNET_free (crd);
165 return cred;
166}
167
168
diff --git a/src/credential/credential_misc.h b/src/credential/credential_misc.h
new file mode 100644
index 000000000..c3aa8c214
--- /dev/null
+++ b/src/credential/credential_misc.h
@@ -0,0 +1,35 @@
1/*
2 This file is part of GNUnet
3 Copyright (C) 2012-2013 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19 */
20/**
21 * @file credential/credential_misc.h
22 * @brief Credential helper functions
23 */
24#ifndef CREDENTIAL_MISC_H
25#define CREDENTIAL_MISC_H
26
27
28
29char*
30GNUNET_CREDENTIAL_credential_to_string (const struct GNUNET_CREDENTIAL_Credential *cred);
31
32struct GNUNET_CREDENTIAL_Credential*
33GNUNET_CREDENTIAL_credential_from_string (const char* str);
34
35#endif
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