2 This file is part of GNUnet.
3 Copyright (C) 2018 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/>.
18 SPDX-License-Identifier: AGPL3.0-or-later
22 * @file hello/hello-ng.c
23 * @brief helper library for handling HELLOs
24 * @author Christian Grothoff
27 #include "gnunet_signatures.h"
28 #include "gnunet_hello_lib.h"
29 #include "gnunet_protocols.h"
30 #include "gnunet_util_lib.h"
31 #include "gnunet_ats_service.h"
34 * Binary block we sign when we sign an address.
39 * Purpose must be #GNUNET_SIGNATURE_PURPOSE_TRANSPORT_ADDRESS
41 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
44 * When was the address generated.
46 struct GNUNET_TIME_AbsoluteNBO mono_time;
49 * Hash of the address.
51 struct GNUNET_HashCode h_addr;
56 * Build address record by signing raw information with private key.
58 * @param address text address at @a communicator to sign
59 * @param nt network type of @a address
60 * @param mono_time monotonic time at which @a address was valid
61 * @param private_key signing key to use
62 * @param result[out] where to write address record (allocated)
63 * @param result_size[out] set to size of @a result
66 GNUNET_HELLO_sign_address (
68 enum GNUNET_NetworkType nt,
69 struct GNUNET_TIME_Absolute mono_time,
70 const struct GNUNET_CRYPTO_EddsaPrivateKey *private_key,
74 struct SignedAddress sa;
75 struct GNUNET_CRYPTO_EddsaSignature sig;
78 sa.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_ADDRESS);
79 sa.purpose.size = htonl (sizeof(sa));
80 sa.mono_time = GNUNET_TIME_absolute_hton (mono_time);
81 GNUNET_CRYPTO_hash (address, strlen (address), &sa.h_addr);
82 GNUNET_assert (GNUNET_YES ==
83 GNUNET_CRYPTO_eddsa_sign (private_key, &sa.purpose, &sig));
85 (void) GNUNET_STRINGS_base64_encode (&sig, sizeof(sig), &sig_str);
87 1 + GNUNET_asprintf ((char **) result,
90 (unsigned long long) mono_time.abs_value_us,
93 GNUNET_free (sig_str);
98 * Check signature and extract address record.
100 * @param raw raw signed address
101 * @param raw_size size of @a raw
102 * @param pid public key to use for signature verification
103 * @param nt[out] set to network type
104 * @param mono_time[out] when was the address generated
105 * @return NULL on error, otherwise the address
108 GNUNET_HELLO_extract_address (const void *raw,
110 const struct GNUNET_PeerIdentity *pid,
111 enum GNUNET_NetworkType *nt,
112 struct GNUNET_TIME_Absolute *mono_time)
114 const struct GNUNET_CRYPTO_EddsaPublicKey *public_key = &pid->public_key;
115 const char *raws = raw;
116 unsigned long long raw_us;
121 const char *raw_addr;
122 struct GNUNET_TIME_Absolute raw_mono_time;
123 struct SignedAddress sa;
124 struct GNUNET_CRYPTO_EddsaSignature *sig;
126 if ('\0' != raws[raw_size])
131 if (NULL == (sc = strchr (raws, ';')))
136 if (NULL == (sc2 = strchr (sc + 1, ';')))
141 if (NULL == (sc3 = strchr (sc2 + 1, ';')))
146 if (1 != sscanf (sc + 1, "%llu;%u;", &raw_us, &raw_nt))
151 raw_mono_time.abs_value_us = raw_us;
153 if (sizeof(struct GNUNET_CRYPTO_EddsaSignature) !=
154 GNUNET_STRINGS_base64_decode (raws, sc - raws, (void **) &sig))
157 GNUNET_free_non_null (sig);
162 sa.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_ADDRESS);
163 sa.purpose.size = htonl (sizeof(sa));
164 sa.mono_time = GNUNET_TIME_absolute_hton (raw_mono_time);
165 GNUNET_CRYPTO_hash (raw_addr, strlen (raw_addr), &sa.h_addr);
167 GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_ADDRESS,
177 *mono_time = raw_mono_time;
178 *nt = (enum GNUNET_NetworkType) raw_nt;
179 return GNUNET_strdup (raw_addr);
184 * Given an address as a string, extract the prefix that identifies
185 * the communicator offering transmissions to that address.
187 * @param address a peer's address
188 * @return NULL if the address is mal-formed, otherwise the prefix
191 GNUNET_HELLO_address_to_prefix (const char *address)
195 dash = strchr (address, '-');
198 return GNUNET_strndup (address, dash - address);