2 This file is part of GNUnet.
3 Copyright (C) 2009-2013, 2016 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
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 Affero General Public License for more details.
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 * @file credential/credential_misc.c
22 * @brief Misc API for credentials
24 * @author Martin Schanzenbach
27 #include "gnunet_util_lib.h"
28 #include "gnunet_constants.h"
29 #include "gnunet_credential_service.h"
30 #include "gnunet_signatures.h"
31 #include "credential.h"
35 GNUNET_CREDENTIAL_credential_to_string (const struct GNUNET_CREDENTIAL_Credential *cred)
43 subject_pkey = GNUNET_CRYPTO_ecdsa_public_key_to_string (&cred->subject_key);
44 issuer_pkey = GNUNET_CRYPTO_ecdsa_public_key_to_string (&cred->issuer_key);
45 GNUNET_STRINGS_base64_encode ((char*)&cred->signature,
46 sizeof (struct GNUNET_CRYPTO_EcdsaSignature),
48 GNUNET_asprintf (&cred_str,
49 "%s.%s -> %s | %s | %"SCNu64,
51 cred->issuer_attribute,
54 cred->expiration.abs_value_us);
55 GNUNET_free (subject_pkey);
56 GNUNET_free (issuer_pkey);
57 GNUNET_free (signature);
61 struct GNUNET_CREDENTIAL_Credential*
62 GNUNET_CREDENTIAL_credential_from_string (const char* s)
64 struct GNUNET_CREDENTIAL_Credential *cred;
65 size_t enclen = (sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey)) * 8;
67 enclen += 5 - enclen % 5;
68 enclen /= 5; /* 260/5 = 52 */
69 char subject_pkey[enclen + 1];
70 char issuer_pkey[enclen + 1];
72 char signature[256]; //TODO max payload size
74 struct GNUNET_CRYPTO_EcdsaSignature *sig;
75 struct GNUNET_TIME_Absolute etime_abs;
78 "%52s.%253s -> %52s | %s | %"SCNu64,
83 &etime_abs.abs_value_us))
85 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
86 _("Unable to parse CRED record string `%s'\n"),
90 cred = GNUNET_malloc (sizeof (struct GNUNET_CREDENTIAL_Credential) + strlen (name) + 1);
91 GNUNET_CRYPTO_ecdsa_public_key_from_string (subject_pkey,
92 strlen (subject_pkey),
94 GNUNET_CRYPTO_ecdsa_public_key_from_string (issuer_pkey,
97 GNUNET_assert (sizeof (struct GNUNET_CRYPTO_EcdsaSignature) == GNUNET_STRINGS_base64_decode (signature,
100 cred->signature = *sig;
101 cred->expiration = etime_abs;
103 GNUNET_memcpy (&cred[1],
106 cred->issuer_attribute_len = strlen ((char*)&cred[1]);
107 cred->issuer_attribute = (char*)&cred[1];
112 * Issue an attribute to a subject
114 * @param issuer the ego that should be used to issue the attribute
115 * @param subject the subject of the attribute
116 * @param attribute the name of the attribute
117 * @return handle to the queued request
119 struct GNUNET_CREDENTIAL_Credential *
120 GNUNET_CREDENTIAL_credential_issue (const struct GNUNET_CRYPTO_EcdsaPrivateKey *issuer,
121 struct GNUNET_CRYPTO_EcdsaPublicKey *subject,
122 const char *attribute,
123 struct GNUNET_TIME_Absolute *expiration)
125 struct CredentialEntry *crd;
126 struct GNUNET_CREDENTIAL_Credential *cred;
129 size = sizeof (struct CredentialEntry) + strlen (attribute) + 1;
130 crd = GNUNET_malloc (size);
131 cred = GNUNET_malloc (sizeof (struct GNUNET_CREDENTIAL_Credential) + strlen (attribute) + 1);
132 crd->purpose.size = htonl (size - sizeof (struct GNUNET_CRYPTO_EcdsaSignature));
134 crd->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_CREDENTIAL);
135 GNUNET_CRYPTO_ecdsa_key_get_public (issuer,
137 crd->subject_key = *subject;
138 crd->expiration = GNUNET_htonll (expiration->abs_value_us);
139 crd->issuer_attribute_len = htonl (strlen (attribute)+1);
140 GNUNET_memcpy ((char*)&crd[1],
142 strlen (attribute)+1);
144 GNUNET_CRYPTO_ecdsa_sign (issuer,
153 cred->signature = crd->signature;
154 cred->expiration = *expiration;
155 GNUNET_CRYPTO_ecdsa_key_get_public (issuer,
158 cred->subject_key = *subject;
159 GNUNET_memcpy (&cred[1],
161 strlen (attribute)+1);
162 cred->issuer_attribute = (char*)&cred[1];