Commit graph

36 commits

Author SHA1 Message Date
xmr-eric
18216f19dd Update 2018 copyright 2018-01-26 10:03:20 -05:00
moneromooo-monero
b49ddc766d
check accessing an element past the end of a container 2017-12-18 15:15:49 +00:00
moneromooo-monero
fa5697127f
make multisig work with subaddresses
Thanks to kenshi84 for help getting this work
2017-12-17 16:12:27 +00:00
moneromooo-monero
66e34e85b1
add multisig core test and factor multisig building blocks 2017-12-17 16:12:15 +00:00
moneromooo-monero
4c313324b1
Add N/N multisig tx generation and signing
Scheme by luigi1111:

    Multisig for RingCT on Monero

    2 of 2

    User A (coordinator):
    Spendkey b,B
    Viewkey a,A (shared)

    User B:
    Spendkey c,C
    Viewkey a,A (shared)

    Public Address: C+B, A

    Both have their own watch only wallet via C+B, a

    A will coordinate spending process (though B could easily as well, coordinator is more needed for more participants)

    A and B watch for incoming outputs

    B creates "half" key images for discovered output D:
    I2_D = (Hs(aR)+c) * Hp(D)

    B also creates 1.5 random keypairs (one scalar and 2 pubkeys; one on base G and one on base Hp(D)) for each output, storing the scalar(k) (linked to D),
    and sending the pubkeys with I2_D.

    A also creates "half" key images:
    I1_D = (Hs(aR)+b) * Hp(D)

    Then I_D = I1_D + I2_D

    Having I_D allows A to check spent status of course, but more importantly allows A to actually build a transaction prefix (and thus transaction).

    A builds the transaction until most of the way through MLSAG_Gen, adding the 2 pubkeys (per input) provided with I2_D
    to his own generated ones where they are needed (secret row L, R).

    At this point, A has a mostly completed transaction (but with an invalid/incomplete signature). A sends over the tx and includes r,
    which allows B (with the recipient's address) to verify the destination and amount (by reconstructing the stealth address and decoding ecdhInfo).

    B then finishes the signature by computing ss[secret_index][0] = ss[secret_index][0] + k - cc[secret_index]*c (secret indices need to be passed as well).

    B can then broadcast the tx, or send it back to A for broadcasting. Once B has completed the signing (and verified the tx to be valid), he can add the full I_D
    to his cache, allowing him to verify spent status as well.

    NOTE:
    A and B *must* present key A and B to each other with a valid signature proving they know a and b respectively.
    Otherwise, trickery like the following becomes possible:
    A creates viewkey a,A, spendkey b,B, and sends a,A,B to B.
    B creates a fake key C = zG - B. B sends C back to A.
    The combined spendkey C+B then equals zG, allowing B to spend funds at any time!
    The signature fixes this, because B does not know a c corresponding to C (and thus can't produce a signature).

    2 of 3

    User A (coordinator)
    Shared viewkey a,A
    "spendkey" j,J

    User B
    "spendkey" k,K

    User C
    "spendkey" m,M

    A collects K and M from B and C
    B collects J and M from A and C
    C collects J and K from A and B

    A computes N = nG, n = Hs(jK)
    A computes O = oG, o = Hs(jM)

    B anc C compute P = pG, p = Hs(kM) || Hs(mK)
    B and C can also compute N and O respectively if they wish to be able to coordinate

    Address: N+O+P, A

    The rest follows as above. The coordinator possesses 2 of 3 needed keys; he can get the other
    needed part of the signature/key images from either of the other two.

    Alternatively, if secure communication exists between parties:
    A gives j to B
    B gives k to C
    C gives m to A

    Address: J+K+M, A

    3 of 3

    Identical to 2 of 2, except the coordinator must collect the key images from both of the others.
    The transaction must also be passed an additional hop: A -> B -> C (or A -> C -> B), who can then broadcast it
    or send it back to A.

    N-1 of N

    Generally the same as 2 of 3, except participants need to be arranged in a ring to pass their keys around
    (using either the secure or insecure method).
    For example (ignoring viewkey so letters line up):
    [4 of 5]
    User: spendkey
    A: a
    B: b
    C: c
    D: d
    E: e

    a -> B, b -> C, c -> D, d -> E, e -> A

    Order of signing does not matter, it just must reach n-1 users. A "remaining keys" list must be passed around with
    the transaction so the signers know if they should use 1 or both keys.
    Collecting key image parts becomes a little messy, but basically every wallet sends over both of their parts with a tag for each.
    Thia way the coordinating wallet can keep track of which images have been added and which wallet they come from. Reasoning:
    1. The key images must be added only once (coordinator will get key images for key a from both A and B, he must add only one to get the proper key actual key image)
    2. The coordinator must keep track of which helper pubkeys came from which wallet (discussed in 2 of 2 section). The coordinator
    must choose only one set to use, then include his choice in the "remaining keys" list so the other wallets know which of their keys to use.

    You can generalize it further to N-2 of N or even M of N, but I'm not sure there's legitimate demand to justify the complexity. It might
    also be straightforward enough to support with minimal changes from N-1 format.
    You basically just give each user additional keys for each additional "-1" you desire. N-2 would be 3 keys per user, N-3 4 keys, etc.

The process is somewhat cumbersome:

To create a N/N multisig wallet:

 - each participant creates a normal wallet
 - each participant runs "prepare_multisig", and sends the resulting string to every other participant
 - each participant runs "make_multisig N A B C D...", with N being the threshold and A B C D... being the strings received from other participants (the threshold must currently equal N)

As txes are received, participants' wallets will need to synchronize so that those new outputs may be spent:

 - each participant runs "export_multisig FILENAME", and sends the FILENAME file to every other participant
 - each participant runs "import_multisig A B C D...", with A B C D... being the filenames received from other participants

Then, a transaction may be initiated:

 - one of the participants runs "transfer ADDRESS AMOUNT"
 - this partly signed transaction will be written to the "multisig_monero_tx" file
 - the initiator sends this file to another participant
 - that other participant runs "sign_multisig multisig_monero_tx"
 - the resulting transaction is written to the "multisig_monero_tx" file again
 - if the threshold was not reached, the file must be sent to another participant, until enough have signed
 - the last participant to sign runs "submit_multisig multisig_monero_tx" to relay the transaction to the Monero network
2017-12-17 16:11:57 +00:00
moneromooo-monero
09ce03d612
move includes around to lessen overall load 2017-12-16 22:46:38 +00:00
moneromooo-monero
ead48f7d92
core: fix input ordering from v7 2017-12-09 11:24:38 +00:00
moneromooo-monero
d58835b2f6
integrate bulletproofs into monero 2017-12-08 13:48:15 +00:00
moneromooo-monero
383ff4f689
remove "using namespace std" from headers
It's nasty, and actually breaks on Solaris, where if.h fails to
build due to:

  struct map *if_memmap;
2017-11-14 16:56:10 +00:00
Riccardo Spagni
48ff10f77f
Merge pull request #2681
ec48e8d8 core: do not forbid txes without destination (moneromooo-monero)
523084bc core: don't add empty additional pub keys field to extra (moneromooo-monero)
2017-11-14 15:02:55 +02:00
Riccardo Spagni
256a1d9ead
Merge pull request #2675
00cc1fdd subaddress: remove unneeded scalarmultBase (kenshi84)
2017-11-14 15:02:14 +02:00
moneromooo-monero
ec48e8d81d
core: do not forbid txes without destination
This was spuriously forbidden in the recent subaddress patch,
which isn't inherently incompatible with these.
2017-10-19 09:11:12 +01:00
moneromooo-monero
523084bc79
core: don't add empty additional pub keys field to extra
Saves a couple bytes per tx
2017-10-19 09:11:10 +01:00
kenshi84
00cc1fdd22
subaddress: remove unneeded scalarmultBase 2017-10-18 08:46:00 +09:00
kenshi84
88ebfd646a
core_tests: fix for subaddress patch 2017-10-17 22:29:01 +09:00
kenshi84
53ad5a0f42
Subaddresses 2017-10-07 13:06:21 +09:00
Riccardo Spagni
2ff832c576
Merge pull request #2540
71c7f8d0 core: fix logging the one time public key on error (moneromooo-monero)
2017-10-06 22:58:20 +04:00
Riccardo Spagni
478b14b565
Merge pull request #2534
4e115a3a core: remove out sorting from v7 rules (moneromooo-monero)
2017-10-06 22:55:00 +04:00
stoffu
cbc5508b15
construct_tx_and_get_tx_key: return sorted sources for print_ring_memebrs to work properly 2017-10-03 08:12:28 +09:00
moneromooo-monero
4e115a3a4c
core: remove out sorting from v7 rules
and restore random shuffle of outputs

This turned out to have a flaw (sort order depends on output
index), and this doesn't really bring much anyway
2017-09-27 12:42:08 +01:00
moneromooo-monero
71c7f8d0dc
core: fix logging the one time public key on error 2017-09-27 11:40:05 +01:00
Riccardo Spagni
5f7cddeb53
Merge pull request #2533
97cdd4c9 core: undo output sorting (moneromooo-monero)
2017-09-26 15:59:32 +02:00
moneromooo-monero
97cdd4c92f
core: undo output sorting
It looks like it may be buggy
2017-09-26 13:23:31 +01:00
moneromooo-monero
ba6907f661
core: fix creation of v1 txes 2017-09-25 22:27:30 +01:00
Riccardo Spagni
c2346c6c59
Merge pull request #2424
28b72b6e tx_pool: pre-init tvc.m_verifivation_failed before processing (moneromooo-monero)
50a629b2 core_tests: catch (impossible in practice) tx extra api failure (moneromooo-monero)
fee15ef1 wallet2: catch failure to parse address (moneromooo-monero)
1399e26d net_peerlist: remove dead code (moneromooo-monero)
50e09698 tx_pool: guard against failure getting tx hash (moneromooo-monero)
54cc209a wallet_rpc_server: catch failure to create directory (moneromooo-monero)
3e55099c wallet_rpc_server: init m_vm to NULL in ctor (moneromooo-monero)
7d0dde5e wallet_args: remove redundant default value for --log-file (moneromooo-monero)
ed4a3350 wallet2: catch failure to save keys file (moneromooo-monero)
44434c8a wallet2_api: check whether dynamic_cast returns NULL (moneromooo-monero)
92f2f687 core: check return value from parse_hexstr_to_binbuff (moneromooo-monero)
5475692e wallet2_api: remove an unused, uninitialized, field (moneromooo-monero)
a7ba3de1 libwallet_api_tests: initialize newblock_triggered on reset (moneromooo-monero)
b2763ace wallet2_api: init error code to "no error" in the ctor (moneromooo-monero)
b5faac53 get_blockchain_top now returns void (moneromooo-monero)
2e44d8f2 wallet_rpc_server: guard against exceptions (moneromooo-monero)
4230876b simplewallet: guard against I/O exceptions (moneromooo-monero)
06c1e057 daemon: initialize decode_as_json in RPC request (moneromooo-monero)
11f71af5 http_base: init size_t in http_request_info ctor (moneromooo-monero)
2017-09-25 16:52:27 +02:00
moneromooo-monero
92f2f687b9
core: check return value from parse_hexstr_to_binbuff 2017-09-25 15:48:24 +01:00
moneromooo-monero
16afab900d
core: sort ins and outs key key image and public key, respectively
This avoids leaking some small amount of information
2017-09-13 09:25:05 +01:00
Riccardo Spagni
bff9fb9c8b
Merge pull request #2231
61770ec2 change mixin to ring size in user visible places (moneromooo-monero)
2017-08-07 22:53:15 +02:00
moneromooo-monero
61770ec2da
change mixin to ring size in user visible places 2017-08-07 21:12:27 +01:00
moneromooo-monero
7f7d42f890
core: fix invalid memory access creating tx 2017-08-07 21:09:19 +01:00
moneromooo-monero
340feedee2
core: randomly shuffle outputs
They used to be sorted by amount, which was fine before rct,
but is now suboptimal, since amounts are not known anymore.
In particular, it would give a recipient knowledge of whether
change was higher or lower than the amount received.
2017-07-25 18:57:57 +01:00
moneromooo-monero
6d315459b6
core: avoid possible reordering bugs wth tx/bloch hash cache 2017-03-25 09:18:53 +00:00
moneromooo-monero
f065234b71
core: cache tx and block hashes in the respective classes
An idea from smooth
2017-03-23 09:25:17 +00:00
Riccardo Spagni
c3599fa7b9
update copyright year, fix occasional lack of newline at line end 2017-02-21 19:38:18 +02:00
moneromooo-monero
a427235e30
core: add a missing newline on a string to be logged 2017-02-14 19:14:41 +00:00
kenshi84
8027ce0c75 extract some basic code from libcryptonote_core into libcryptonote_basic 2017-02-08 22:45:15 +09:00