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Send the public part of the one time key rather than passing an identifier

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This commit is contained in:
Mark Haines 2015-07-08 14:53:25 +01:00
parent 974e0984bd
commit 5291ec78b5
9 changed files with 39 additions and 31 deletions
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2
include/olm/account.hh
View file

@ -100,7 +100,7 @@ struct Account {
);
OneTimeKey const * lookup_key(
std::uint32_t id
Curve25519PublicKey const & public_key
);
std::size_t remove_key(

8
include/olm/message.hh
View file

@ -73,16 +73,16 @@ void decode_message(
struct PreKeyMessageWriter {
std::uint8_t * identity_key;
std::uint8_t * base_key;
std::uint8_t * one_time_key;
std::uint8_t * message;
};
struct PreKeyMessageReader {
std::uint8_t version;
bool has_one_time_key_id;
std::uint32_t one_time_key_id;
std::uint8_t const * identity_key; std::size_t identity_key_length;
std::uint8_t const * base_key; std::size_t base_key_length;
std::uint8_t const * one_time_key; std::size_t one_time_key_length;
std::uint8_t const * message; std::size_t message_length;
};
@ -91,9 +91,9 @@ struct PreKeyMessageReader {
* The length of the buffer needed to hold a message.
*/
std::size_t encode_one_time_key_message_length(
std::uint32_t one_time_key_id,
std::size_t identity_key_length,
std::size_t base_key_length,
std::size_t one_time_key_length,
std::size_t message_length
);
@ -105,9 +105,9 @@ std::size_t encode_one_time_key_message_length(
void encode_one_time_key_message(
PreKeyMessageWriter & writer,
std::uint8_t version,
std::uint32_t one_time_key_id,
std::size_t identity_key_length,
std::size_t base_key_length,
std::size_t one_time_key_length,
std::size_t message_length,
std::uint8_t * output
);

1
include/olm/olm.hh
View file

@ -187,7 +187,6 @@ size_t olm_create_outbound_session(
OlmSession * session,
OlmAccount * account,
void const * their_identity_key, size_t their_identity_key_length,
unsigned their_one_time_key_id,
void const * their_one_time_key, size_t their_one_time_key_length,
void const * random, size_t random_length
);

2
include/olm/session.hh
View file

@ -44,9 +44,9 @@ struct Session {
RemoteKey alice_identity_key;
Curve25519PublicKey alice_base_key;
Curve25519PublicKey bob_one_time_key;
std::uint32_t bob_one_time_key_id;
std::size_t new_outbound_session_random_length();
std::size_t new_outbound_session(

6
src/account.cpp
View file

@ -18,10 +18,12 @@
olm::OneTimeKey const * olm::Account::lookup_key(
std::uint32_t id
olm::Curve25519PublicKey const & public_key
) {
for (olm::OneTimeKey const & key : one_time_keys) {
if (key.id == id) return &key;
if (0 == memcmp(key.key.public_key, public_key.public_key, 32)) {
return &key;
}
}
return 0;
}

14
src/message.cpp
View file

@ -232,7 +232,7 @@ void olm::decode_message(
namespace {
static std::uint8_t const ONE_TIME_KEY_ID_TAG = 010;
static std::uint8_t const ONE_TIME_KEY_ID_TAG = 012;
static std::uint8_t const BASE_KEY_TAG = 022;
static std::uint8_t const IDENTITY_KEY_TAG = 032;
static std::uint8_t const MESSAGE_TAG = 042;
@ -241,13 +241,13 @@ static std::uint8_t const MESSAGE_TAG = 042;
std::size_t olm::encode_one_time_key_message_length(
std::uint32_t one_time_key_id,
std::size_t one_time_key_length,
std::size_t identity_key_length,
std::size_t base_key_length,
std::size_t message_length
) {
std::size_t length = VERSION_LENGTH;
length += 1 + varint_length(one_time_key_id);
length += 1 + varstring_length(one_time_key_length);
length += 1 + varstring_length(identity_key_length);
length += 1 + varstring_length(base_key_length);
length += 1 + varstring_length(message_length);
@ -258,15 +258,15 @@ std::size_t olm::encode_one_time_key_message_length(
void olm::encode_one_time_key_message(
olm::PreKeyMessageWriter & writer,
std::uint8_t version,
std::uint32_t one_time_key_id,
std::size_t identity_key_length,
std::size_t base_key_length,
std::size_t one_time_key_length,
std::size_t message_length,
std::uint8_t * output
) {
std::uint8_t * pos = output;
*(pos++) = version;
pos = encode(pos, ONE_TIME_KEY_ID_TAG, one_time_key_id);
pos = encode(pos, ONE_TIME_KEY_ID_TAG, writer.one_time_key, one_time_key_length);
pos = encode(pos, BASE_KEY_TAG, writer.base_key, base_key_length);
pos = encode(pos, IDENTITY_KEY_TAG, writer.identity_key, identity_key_length);
pos = encode(pos, MESSAGE_TAG, writer.message, message_length);
@ -283,7 +283,7 @@ void olm::decode_one_time_key_message(
if (pos == end) return;
reader.version = *(pos++);
reader.has_one_time_key_id = false;
reader.one_time_key = nullptr;
reader.identity_key = nullptr;
reader.base_key = nullptr;
reader.message = nullptr;
@ -291,7 +291,7 @@ void olm::decode_one_time_key_message(
while (pos != end) {
pos = decode(
pos, end, ONE_TIME_KEY_ID_TAG,
reader.one_time_key_id, reader.has_one_time_key_id
reader.one_time_key, reader.one_time_key_length
);
pos = decode(
pos, end, BASE_KEY_TAG,

2
src/olm.cpp
View file

@ -425,7 +425,6 @@ size_t olm_create_outbound_session(
OlmSession * session,
OlmAccount * account,
void const * their_identity_key, size_t their_identity_key_length,
unsigned their_one_time_key_id,
void const * their_one_time_key, size_t their_one_time_key_length,
void const * random, size_t random_length
) {
@ -442,7 +441,6 @@ size_t olm_create_outbound_session(
from_c(their_identity_key), their_identity_key_length,
identity_key.public_key
);
one_time_key.id = their_one_time_key_id;
olm::decode_base64(
from_c(their_one_time_key), their_one_time_key_length,
one_time_key.key.public_key

31
src/session.cpp
View file

@ -77,7 +77,7 @@ std::size_t olm::Session::new_outbound_session(
alice_identity_key.id = 0;
alice_identity_key.key = local_account.identity_keys.curve25519_key;
alice_base_key = base_key;
bob_one_time_key_id = one_time_key.id;
bob_one_time_key = one_time_key.key;
std::uint8_t shared_secret[96];
@ -112,7 +112,8 @@ bool check_message_fields(
ok = ok && reader.message;
ok = ok && reader.base_key;
ok = ok && reader.base_key_length == KEY_LENGTH;
ok = ok && reader.has_one_time_key_id;
ok = ok && reader.one_time_key;
ok = ok && reader.one_time_key_length == KEY_LENGTH;
return ok;
}
@ -145,15 +146,15 @@ std::size_t olm::Session::new_inbound_session(
std::memcpy(alice_identity_key.key.public_key, reader.identity_key, 32);
std::memcpy(alice_base_key.public_key, reader.base_key, 32);
bob_one_time_key_id = reader.one_time_key_id;
std::memcpy(bob_one_time_key.public_key, reader.one_time_key, 32);
olm::Curve25519PublicKey ratchet_key;
std::memcpy(ratchet_key.public_key, message_reader.ratchet_key, 32);
olm::OneTimeKey const * bob_one_time_key = local_account.lookup_key(
bob_one_time_key_id
olm::OneTimeKey const * our_one_time_key = local_account.lookup_key(
bob_one_time_key
);
if (!bob_one_time_key) {
if (!our_one_time_key) {
last_error = olm::ErrorCode::BAD_MESSAGE_KEY_ID;
return std::size_t(-1);
}
@ -161,14 +162,14 @@ std::size_t olm::Session::new_inbound_session(
std::uint8_t shared_secret[96];
olm::curve25519_shared_secret(
bob_one_time_key->key, alice_identity_key.key, shared_secret
our_one_time_key->key, alice_identity_key.key, shared_secret
);
olm::curve25519_shared_secret(
local_account.identity_keys.curve25519_key,
alice_base_key, shared_secret + 32
);
olm::curve25519_shared_secret(
bob_one_time_key->key, alice_base_key, shared_secret + 64
our_one_time_key->key, alice_base_key, shared_secret + 64
);
ratchet.initialise_as_bob(shared_secret, 96, ratchet_key);
@ -194,7 +195,9 @@ bool olm::Session::matches_inbound_session(
same = same && 0 == std::memcmp(
reader.base_key, alice_base_key.public_key, KEY_LENGTH
);
same = same && reader.one_time_key_id == bob_one_time_key_id;
same = same && 0 == std::memcmp(
reader.one_time_key, bob_one_time_key.public_key, KEY_LENGTH
);
return same;
}
@ -220,7 +223,7 @@ std::size_t olm::Session::encrypt_message_length(
}
return encode_one_time_key_message_length(
bob_one_time_key_id,
KEY_LENGTH,
KEY_LENGTH,
KEY_LENGTH,
message_length
@ -254,12 +257,15 @@ std::size_t olm::Session::encrypt(
encode_one_time_key_message(
writer,
PROTOCOL_VERSION,
bob_one_time_key_id,
KEY_LENGTH,
KEY_LENGTH,
KEY_LENGTH,
message_body_length,
message
);
std::memcpy(
writer.one_time_key, bob_one_time_key.public_key, KEY_LENGTH
);
std::memcpy(
writer.identity_key, alice_identity_key.key.public_key, KEY_LENGTH
);
@ -358,6 +364,7 @@ std::size_t olm::pickle_length(
length += olm::pickle_length(value.alice_identity_key.id);
length += olm::pickle_length(value.alice_identity_key.key);
length += olm::pickle_length(value.alice_base_key);
length += olm::pickle_length(value.bob_one_time_key);
length += olm::pickle_length(value.bob_one_time_key_id);
length += olm::pickle_length(value.ratchet);
return length;
@ -372,6 +379,7 @@ std::uint8_t * olm::pickle(
pos = olm::pickle(pos, value.alice_identity_key.id);
pos = olm::pickle(pos, value.alice_identity_key.key);
pos = olm::pickle(pos, value.alice_base_key);
pos = olm::pickle(pos, value.bob_one_time_key);
pos = olm::pickle(pos, value.bob_one_time_key_id);
pos = olm::pickle(pos, value.ratchet);
return pos;
@ -386,6 +394,7 @@ std::uint8_t const * olm::unpickle(
pos = olm::unpickle(pos, end, value.alice_identity_key.id);
pos = olm::unpickle(pos, end, value.alice_identity_key.key);
pos = olm::unpickle(pos, end, value.alice_base_key);
pos = olm::unpickle(pos, end, value.bob_one_time_key);
pos = olm::unpickle(pos, end, value.bob_one_time_key_id);
pos = olm::unpickle(pos, end, value.ratchet);
return pos;

4
tests/test_olm.cpp
View file

@ -89,7 +89,7 @@ mock_random_a(a_rand, sizeof(a_rand));
assert_not_equals(std::size_t(-1), ::olm_create_outbound_session(
a_session, a_account,
b_id_keys + 88, 43,
::atol((char *)(b_ot_keys + 62)), b_ot_keys + 74, 43,
b_ot_keys + 74, 43,
a_rand, sizeof(a_rand)
));
@ -193,7 +193,7 @@ mock_random_a(a_rand, sizeof(a_rand));
assert_not_equals(std::size_t(-1), ::olm_create_outbound_session(
a_session, a_account,
b_id_keys + 88, 43,
::atol((char *)(b_ot_keys + 62)), b_ot_keys + 74, 43,
b_ot_keys + 74, 43,
a_rand, sizeof(a_rand)
));