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57 commits

Author SHA1 Message Date
moneromooo-monero 7d413f635f
rct: rework serialization to avoid storing vector sizes 2016-09-14 20:23:06 +01:00
moneromooo-monero f24ab58d18
ringct: remove unused code 2016-08-28 21:30:53 +01:00
moneromooo-monero b38452bd55
ringct: pass structure by const ref, not value 2016-08-28 21:30:51 +01:00
moneromooo-monero fd11271eea
ringct: use memcpy/memset instead of handwritten loop where appropriate 2016-08-28 21:30:49 +01:00
moneromooo-monero 5d38206fcc
ringct: remove spurious copies 2016-08-28 21:30:47 +01:00
moneromooo-monero 16732a85d7
rct: faster Cryptonote/rct conversions 2016-08-28 21:30:45 +01:00
moneromooo-monero 94fd881f74
rct: early out on failure on verRange 2016-08-28 21:30:38 +01:00
moneromooo-monero 074e602609
ringct: use Cryptonote serialization to hash non prunable data 2016-08-28 21:30:28 +01:00
moneromooo-monero c3b3260ae5
New "Halfway RingCT" outputs for coinbase transactions 
When RingCT is enabled, outputs from coinbase transactions
are created as a single output, and stored as RingCT output,
with a fake mask. Their amount is not hidden on the blockchain
itself, but they are then able to be used as fake inputs in
a RingCT ring. Since the output amounts are hidden, their
"dustiness" is not an obstacle anymore to mixing, and this
makes the coinbase transactions a lot smaller, as well as
helping the TXO set to grow more slowly.

Also add a new "Null" type of rct signature, which decreases
the size required when no signatures are to be stored, as
in a coinbase tx.
 2016-08-28 21:30:26 +01:00
moneromooo-monero 6f526cdff8
rct: log why verification fails 
and remove some unnecessary variables in the checking code
 2016-08-28 21:30:23 +01:00
moneromooo-monero d4b8991e44
rct: serialize txnFee as varint 2016-08-28 21:30:21 +01:00
moneromooo-monero d4b62a1e29
rct amount key modified as per luigi1111's recommendations 
This allows the key to be not the same for two outputs sent to
the same address (eg, if you pay yourself, and also get change
back). Also remove the key amounts lists and return parameters
since we don't actually generate random ones, so we don't need
to save them as we can recalculate them when needed if we have
the correct keys.
 2016-08-28 21:30:19 +01:00
moneromooo-monero 93f5c625f0
rct: rework v2 txes into prunable and non prunable data 
Nothing is pruned, but this allows easier changes later.
 2016-08-28 21:30:18 +01:00
moneromooo-monero d93746b6d3
rct: rework the verification preparation process 
The whole rct data apart from the MLSAGs is now included in
the signed message, to avoid malleability issues.

Instead of passing the data that's not serialized as extra
parameters to the verification API, the transaction is modified
to fill all that information. This means the transaction can
not be const anymore, but it cleaner in other ways.
 2016-08-28 21:30:16 +01:00
moneromooo-monero 3ab2ab3e76
rct: change the simple flag to a type 
for future expansion
 2016-08-28 21:30:14 +01:00
Shen Noether c5be4b0bea
rct: avoid the need for the last II element 
This element is used in the generation of the MLSAG, but isn't
needed in verification.
Also misc changes in the cryptonote code to match, by mooo.
 2016-08-28 21:30:12 +01:00
moneromooo-monero b337aea6cc
rct: do not serialize senderPk - it is not used anymore 2016-08-28 21:30:01 +01:00
moneromooo-monero 9b70856ccb
rct: make the amount key derivable by a third party with the tx key 
Scheme design from luigi1114.
 2016-08-28 21:29:46 +01:00
moneromooo-monero cf33e1a52a
rct: do not serialize public keys in outPk 
They can be reconstructed from vout
 2016-08-28 21:29:43 +01:00
moneromooo-monero 1e21651f24
rct: use the already defined H where possible 
Found by luigi1111w
 2016-08-28 21:29:29 +01:00
moneromooo-monero e81a2b2cfa
port get_tx_key/check_tx_key to rct 2016-08-28 21:29:24 +01:00
moneromooo-monero a4d4d6194b
integrate simple rct api 2016-08-28 21:29:20 +01:00
Shen Noether dbb5f2d6a3
ringct: optimization/cleanup of hash functions 2016-08-28 21:29:16 +01:00
Shen Noether 4fd01f2bee
ringct: "simple" ringct variant 
Allows the fake outs to be in different positions for each ring.
For rct inputs only.
 2016-08-28 21:29:14 +01:00
moneromooo-monero 35dce5c70c
ringct: fix size unit mismatch calling keccak 2016-08-28 21:28:57 +01:00
moneromooo-monero 20e50ec7f7
ringct: do not serialize what can be reconstructed 
The mixRing (output keys and commitments) and II fields (key images)
can be reconstructed from vin data.
This saves some modest amount of space in the tx.
 2016-08-28 21:28:55 +01:00
moneromooo-monero 73d59f17e1
ringct: catch errors from ge_frombytes_vartime 2016-08-28 21:28:45 +01:00
moneromooo-monero 359f46901e
ringct: add missing size check for ecdhInfo 2016-08-28 21:28:41 +01:00
moneromooo-monero 229968eafc
ringct: change asserts to return false for boolean functions 2016-08-28 21:28:39 +01:00
moneromooo-monero dc4aad7eb5
add rct to the protocol 
It is not yet constrained to a fork, so don't use on the real network
or you'll be orphaned or rejected.
 2016-08-28 21:28:37 +01:00
moneromooo-monero dee42d6dac
ringct: add functions to commit to an amount 
One to commit to an amount with zero key (for use with fake
commitments for pre-rct outputs), and one with an arbitrary
key (for rct outputs).
 2016-08-28 21:28:33 +01:00
moneromooo-monero cc7f449d57
make rct tx serialization work 
It may be suboptimal, but it's a pain to have to rebuild everything
when some of this changes.
Also, no clue why there seems to be two different code paths for
serializing a tx...
 2016-08-28 21:28:31 +01:00
moneromooo-monero 54f7429cf6
ringct: allow no outputs, and add tests for this and fees 2016-08-28 21:28:27 +01:00
moneromooo-monero e99904ac31
ringct: make fee optional 2016-08-28 21:28:25 +01:00
Shen Noether f8c04ad94f
ringct: txn fee stuff 2016-08-28 21:28:23 +01:00
moneromooo-monero 66f96260b2
ringct: new {gen,decode}Rct APIs for convenience 
A new version of genRct takes the mixRing as parameter, instead
of the inPk. inPk are part of the mixRing, and it is cleaner to
pass the mixRing data than to fetch it from the RingCT code.

A new version of decodeRct also returns the mask.

Also, failure to decode throws, so errors are properly detected.
 2016-08-28 21:28:21 +01:00
moneromooo-monero 789b2e21f6
ringct: add more convenience functions 2016-08-28 21:28:20 +01:00
moneromooo-monero c3a2e1450a
ringct: add convenience functions to bridge ringct and cryptonote 2016-08-28 21:28:14 +01:00
moneromooo-monero 82072e701a
ringct: restore verRange check in debug mode 2016-08-28 21:28:08 +01:00
moneromooo-monero 63856cad29
ringct: add check for destinations/amount size being equal 2016-08-28 21:28:07 +01:00
moneromooo-monero e816a09292
ringct: fix off by 1 in mixin usage 2016-08-28 21:28:04 +01:00
moneromooo-monero 09c5ea43a2
ringct: simplify random key generation 2016-08-28 21:28:03 +01:00
Shen Noether 56f6549962
ringct: cosmetic fixes 
Ported from Shen's RingCT repo
 2016-08-28 21:27:59 +01:00
Shen Noether 55ff136e12
ringct: changes to hashToPointSimple to calcualte H2 values 
Ported from Shen's RingCT repo
 2016-08-28 21:27:57 +01:00
Shen Noether 63733b1785
ringct: compare keys with bitwise equality, not crypto ops 
Ported from Shen's RingCT repo
 2016-08-28 21:27:56 +01:00
Shen Noether 98f4c6f7eb
ringct: fix size argument to cn_fast_hash 
Ported from Shen's RingCT repo
 2016-08-28 21:27:54 +01:00
Shen Noether 09fb9f4b75
Fix sc_0 to skGen in ProveRange 2016-08-28 21:27:48 +01:00
moneromooo-monero d37c1db032
ringct: add a few consts where appropriate 2016-08-28 21:27:45 +01:00
moneromooo-monero 700248f59e
tests: more ringct range proof tests 2016-08-28 21:27:43 +01:00
moneromooo-monero d02f9995a8
rct: add serialization machinery to rct types 2016-08-28 21:27:41 +01:00