account.cpp 9.07 KB
Newer Older
Mark Haines's avatar
Mark Haines committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
/* Copyright 2015 OpenMarket Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
15
#include "olm/account.hh"
16
#include "olm/base64.hh"
17
#include "olm/pickle.hh"
18
19


20
olm::OneTimeKey const * olm::Account::lookup_key(
21
    olm::Curve25519PublicKey const & public_key
22
) {
23
    for (olm::OneTimeKey const & key : one_time_keys) {
24
25
26
        if (0 == memcmp(key.key.public_key, public_key.public_key, 32)) {
            return &key;
        }
27
28
29
30
    }
    return 0;
}

31
std::size_t olm::Account::remove_key(
32
33
    std::uint32_t id
) {
34
    OneTimeKey * i;
35
36
37
38
39
40
41
42
    for (i = one_time_keys.begin(); i != one_time_keys.end(); ++i) {
        if (i->id == id) {
            one_time_keys.erase(i);
            return id;
        }
    }
    return std::size_t(-1);
}
Mark Haines's avatar
Mark Haines committed
43

44
std::size_t olm::Account::new_account_random_length() {
Mark Haines's avatar
Mark Haines committed
45
46
47
    return 103 * 32;
}

48
std::size_t olm::Account::new_account(
Mark Haines's avatar
Mark Haines committed
49
50
51
    uint8_t const * random, std::size_t random_length
) {
    if (random_length < new_account_random_length()) {
52
        last_error = olm::ErrorCode::NOT_ENOUGH_RANDOM;
53
        return std::size_t(-1);
Mark Haines's avatar
Mark Haines committed
54
55
56
57
    }

    unsigned id = 0;

58
    olm::ed25519_generate_key(random, identity_keys.ed25519_key);
Mark Haines's avatar
Mark Haines committed
59
    random += 32;
60
    olm::curve25519_generate_key(random, identity_keys.curve25519_key);
Mark Haines's avatar
Mark Haines committed
61
62
    random += 32;

63
    for (unsigned i = 0; i < 10; ++i) {
64
        OneTimeKey & key = *one_time_keys.insert(one_time_keys.end());
Mark Haines's avatar
Mark Haines committed
65
        key.id = ++id;
66
        olm::curve25519_generate_key(random, key.key);
Mark Haines's avatar
Mark Haines committed
67
68
69
70
71
72
        random += 32;
    }

    return 0;
}

73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
namespace {

static const uint8_t IDENTITY_JSON_PART_0[] =
    "{\"algorithms\":"
    "[\"m.olm.curve25519-aes-sha256\""
    "],\"device_id\":\"";
static const uint8_t IDENTITY_JSON_PART_1[] = "\",\"keys\":{\"curve25519:";
static const uint8_t IDENTITY_JSON_PART_2[] = "\":\"";
static const uint8_t IDENTITY_JSON_PART_3[] = "\",\"ed25519:";
static const uint8_t IDENTITY_JSON_PART_4[] = "\":\"";
static const uint8_t IDENTITY_JSON_PART_5[] = "\"},\"user_id\":\"";
static const uint8_t IDENTITY_JSON_PART_6[] = "\",\"valid_after_ts\":";
static const uint8_t IDENTITY_JSON_PART_7[] = ",\"valid_until_ts\":";
static const uint8_t IDENTITY_JSON_PART_8[] = ",\"signatures\":{\"";
static const uint8_t IDENTITY_JSON_PART_9[] = "/";
static const uint8_t IDENTITY_JSON_PART_A[] = "\":{\"ed25519:";
static const uint8_t IDENTITY_JSON_PART_B[] = "\":\"";
static const uint8_t IDENTITY_JSON_PART_C[] = "\"}}}";

std::size_t count_digits(
    std::uint64_t value
) {
    std::size_t digits = 0;
    do {
        digits++;
        value /= 10;
    } while (value);
    return digits;
}

template<typename T>
std::uint8_t * write_string(
    std::uint8_t * pos,
    T const & value
) {
    std::memcpy(pos, value, sizeof(T) - 1);
    return pos + (sizeof(T) - 1);
}

std::uint8_t * write_string(
    std::uint8_t * pos,
    std::uint8_t const * value, std::size_t value_length
) {
    std::memcpy(pos, value, value_length);
    return pos + value_length;
}

std::uint8_t * write_digits(
    std::uint8_t * pos,
    std::uint64_t value
) {
    size_t digits = count_digits(value);
    pos += digits;
    do {
        *(--pos) = '0' + (value % 10);
        value /= 10;
    } while (value);
    return pos + digits;
}

}


std::size_t olm::Account::get_identity_json_length(
    std::size_t user_id_length,
    std::size_t device_id_length,
    std::uint64_t valid_after_ts,
    std::uint64_t valid_until_ts
) {
    std::size_t length = 0;
    length += sizeof(IDENTITY_JSON_PART_0) - 1;
    length += device_id_length;
    length += sizeof(IDENTITY_JSON_PART_1) - 1;
    length += 4;
    length += sizeof(IDENTITY_JSON_PART_2) - 1;
    length += 43;
    length += sizeof(IDENTITY_JSON_PART_3) - 1;
    length += 4;
    length += sizeof(IDENTITY_JSON_PART_4) - 1;
    length += 43;
    length += sizeof(IDENTITY_JSON_PART_5) - 1;
    length += user_id_length;
    length += sizeof(IDENTITY_JSON_PART_6) - 1;
    length += count_digits(valid_after_ts);
    length += sizeof(IDENTITY_JSON_PART_7) - 1;
    length += count_digits(valid_until_ts);
    length += sizeof(IDENTITY_JSON_PART_8) - 1;
    length += user_id_length;
    length += sizeof(IDENTITY_JSON_PART_9) - 1;
    length += device_id_length;
    length += sizeof(IDENTITY_JSON_PART_A) - 1;
    length += 4;
    length += sizeof(IDENTITY_JSON_PART_B) - 1;
    length += 86;
    length += sizeof(IDENTITY_JSON_PART_C) - 1;
    return length;
}


std::size_t olm::Account::get_identity_json(
    std::uint8_t const * user_id, std::size_t user_id_length,
    std::uint8_t const * device_id, std::size_t device_id_length,
    std::uint64_t valid_after_ts,
176
    std::uint64_t valid_until_ts,
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
    std::uint8_t * identity_json, std::size_t identity_json_length
) {

    std::uint8_t * pos = identity_json;
    std::uint8_t signature[64];
    size_t expected_length = get_identity_json_length(
            user_id_length, device_id_length, valid_after_ts, valid_until_ts
    );

    if (identity_json_length < expected_length) {
        last_error = olm::ErrorCode::OUTPUT_BUFFER_TOO_SMALL;
        return std::size_t(-1);
    }

    pos = write_string(pos, IDENTITY_JSON_PART_0);
    pos = write_string(pos, device_id, device_id_length);
    pos = write_string(pos, IDENTITY_JSON_PART_1);
    encode_base64(identity_keys.curve25519_key.public_key, 3, pos);
    pos += 4;
    pos = write_string(pos, IDENTITY_JSON_PART_2);
    encode_base64(identity_keys.curve25519_key.public_key, 32, pos);
    pos += 43;
    pos = write_string(pos, IDENTITY_JSON_PART_3);
    encode_base64(identity_keys.ed25519_key.public_key, 3, pos);
    pos += 4;
    pos = write_string(pos, IDENTITY_JSON_PART_4);
    encode_base64(identity_keys.ed25519_key.public_key, 32, pos);
    pos += 43;
    pos = write_string(pos, IDENTITY_JSON_PART_5);
    pos = write_string(pos, user_id, user_id_length);
    pos = write_string(pos, IDENTITY_JSON_PART_6);
    pos = write_digits(pos, valid_after_ts);
    pos = write_string(pos, IDENTITY_JSON_PART_7);
    pos = write_digits(pos, valid_until_ts);
    *pos = '}';
    // Sign the JSON up to written up to this point.
    ed25519_sign(
        identity_keys.ed25519_key,
        identity_json, 1 + pos - identity_json,
        signature
    );
    // Append the signature to the end of the JSON.
    pos = write_string(pos, IDENTITY_JSON_PART_8);
    pos = write_string(pos, user_id, user_id_length);
    pos = write_string(pos, IDENTITY_JSON_PART_9);
    pos = write_string(pos, device_id, device_id_length);
    pos = write_string(pos, IDENTITY_JSON_PART_A);
    encode_base64(identity_keys.ed25519_key.public_key, 3, pos);
    pos += 4;
    pos = write_string(pos, IDENTITY_JSON_PART_B);
    encode_base64(signature, 64, pos);
    pos += 86;
    pos = write_string(pos, IDENTITY_JSON_PART_C);
    return pos - identity_json;
}
Mark Haines's avatar
Mark Haines committed
232

233
namespace olm {
234

235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
static std::size_t pickle_length(
    olm::IdentityKeys const & value
) {
    size_t length = 0;
    length += olm::pickle_length(value.ed25519_key);
    length += olm::pickle_length(value.curve25519_key);
    return length;
}


static std::uint8_t * pickle(
    std::uint8_t * pos,
    olm::IdentityKeys const & value
) {
    pos = olm::pickle(pos, value.ed25519_key);
    pos = olm::pickle(pos, value.curve25519_key);
    return pos;
}


static std::uint8_t const * unpickle(
    std::uint8_t const * pos, std::uint8_t const * end,
    olm::IdentityKeys & value
) {
    pos = olm::unpickle(pos, end, value.ed25519_key);
    pos = olm::unpickle(pos, end, value.curve25519_key);
    return pos;
}

264
265

static std::size_t pickle_length(
266
    olm::OneTimeKey const & value
267
) {
268
    return olm::pickle_length(value.id) + olm::pickle_length(value.key);
269
270
271
272
273
}


static std::uint8_t * pickle(
    std::uint8_t * pos,
274
    olm::OneTimeKey const & value
275
) {
276
277
    pos = olm::pickle(pos, value.id);
    pos = olm::pickle(pos, value.key);
278
279
280
281
282
283
    return pos;
}


static std::uint8_t const * unpickle(
    std::uint8_t const * pos, std::uint8_t const * end,
284
    olm::OneTimeKey & value
285
) {
286
287
    pos = olm::unpickle(pos, end, value.id);
    pos = olm::unpickle(pos, end, value.key);
288
289
290
    return pos;
}

291
} // namespace olm
292
293


294
295
std::size_t olm::pickle_length(
    olm::Account const & value
296
297
) {
    std::size_t length = 0;
298
    length += olm::pickle_length(value.identity_keys);
299
    length += olm::pickle_length(value.one_time_keys);
300
301
302
303
    return length;
}


304
std::uint8_t * olm::pickle(
305
    std::uint8_t * pos,
306
    olm::Account const & value
307
) {
308
    pos = olm::pickle(pos, value.identity_keys);
309
    pos = olm::pickle(pos, value.one_time_keys);
310
311
312
313
    return pos;
}


314
std::uint8_t const * olm::unpickle(
315
    std::uint8_t const * pos, std::uint8_t const * end,
316
    olm::Account & value
317
) {
318
    pos = olm::unpickle(pos, end, value.identity_keys);
319
    pos = olm::unpickle(pos, end, value.one_time_keys);
320
321
    return pos;
}