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{. push raises : [ Defect ] . }
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import
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std / tables ,
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options , chronos , stint ,
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web3 ,
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eth / keys ,
libp2p / protobuf / minprotobuf ,
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stew / arrayops ,
.. / .. / utils / protobuf
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## Bn256 and RLN are Nim wrappers for the data types used in
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## the rln library https://github.com/kilic/rln/blob/3bbec368a4adc68cd5f9bfae80b17e1bbb4ef373/src/ffi.rs
type Bn256 * = pointer
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type RLN * [ E ] = pointer
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type
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# identity key as defined in https://hackmd.io/tMTLMYmTR5eynw2lwK9n1w?view#Membership
IDKey * = array [ 32 , byte ]
# hash of identity key as defined ed in https://hackmd.io/tMTLMYmTR5eynw2lwK9n1w?view#Membership
IDCommitment * = array [ 32 , byte ]
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type
MerkleNode * = array [ 32 , byte ] # Each node of the Merkle tee is a Poseidon hash which is a 32 byte value
Nullifier * = array [ 32 , byte ]
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ZKSNARK * = array [ 256 , byte ]
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Epoch * = array [ 32 , byte ]
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# Custom data types defined for waku rln relay -------------------------
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type MembershipKeyPair * = object
## user's identity key (a secret key) which is selected randomly
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## see details in https://hackmd.io/tMTLMYmTR5eynw2lwK9n1w?view#Membership
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idKey * : IDKey
# hash of user's identity key generated by
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# Poseidon hash function implemented in rln lib
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# more details in https://hackmd.io/tMTLMYmTR5eynw2lwK9n1w?view#Membership
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idCommitment * : IDCommitment
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type RateLimitProof * = object
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## RateLimitProof holds the public inputs to rln circuit as
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## defined in https://hackmd.io/tMTLMYmTR5eynw2lwK9n1w?view#Public-Inputs
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## the `proof` field carries the actual zkSNARK proof
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proof * : ZKSNARK
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## the root of Merkle tree used for the generation of the `proof`
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merkleRoot * : MerkleNode
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## the epoch used for the generation of the `proof`
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epoch * : Epoch
## shareX and shareY are shares of user's identity key
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## these shares are created using Shamir secret sharing scheme
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## see details in https://hackmd.io/tMTLMYmTR5eynw2lwK9n1w?view#Linear-Equation-amp-SSS
shareX * : MerkleNode
shareY * : MerkleNode
## nullifier enables linking two messages published during the same epoch
## see details in https://hackmd.io/tMTLMYmTR5eynw2lwK9n1w?view#Nullifiers
nullifier * : Nullifier
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type MembershipIndex * = uint
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type ProofMetadata * = object
nullifier * : Nullifier
shareX * : MerkleNode
shareY * : MerkleNode
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type WakuRLNRelay * = ref object
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membershipKeyPair * : MembershipKeyPair
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# membershipIndex denotes the index of a leaf in the Merkle tree
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# that contains the pk of the current peer
# this index is used to retrieve the peer's authentication path
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membershipIndex * : MembershipIndex
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membershipContractAddress * : Address
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ethClientAddress * : string
ethAccountAddress * : Address
# this field is required for signing transactions
# TODO may need to erase this ethAccountPrivateKey when is not used
# TODO may need to make ethAccountPrivateKey mandatory
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ethAccountPrivateKey * : Option [ PrivateKey ]
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rlnInstance * : RLN [ Bn256 ]
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pubsubTopic * : string # the pubsub topic for which rln relay is mounted
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# contentTopic should be of type waku_message.ContentTopic, however, due to recursive module dependency, the underlying type of ContentTopic is used instead
# TODO a long-term solution is to place types with recursive dependency inside one file
contentTopic * : string
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# the log of nullifiers and Shamir shares of the past messages grouped per epoch
nullifierLog * : Table [ Epoch , seq [ ProofMetadata ] ]
type MessageValidationResult * {. pure . } = enum
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Valid , Invalid , Spam
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# inputs of the membership contract constructor
# TODO may be able to make these constants private and put them inside the waku_rln_relay_utils
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const
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MEMBERSHIP_FEE * = 1000000000000000 . u256
# the current implementation of the rln lib supports a circuit for Merkle tree with depth 20
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MERKLE_TREE_DEPTH * = 20
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# TODO the ETH_CLIENT should be an input to the rln-relay, though hardcoded for now
# the current address is the address of ganache-cli when run locally
ETH_CLIENT * = " ws://localhost:8540/ "
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const
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# the size of poseidon hash output in bits
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HASH_BIT_SIZE * = 256
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# the size of poseidon hash output as the number hex digits
HASH_HEX_SIZE * = int ( HASH_BIT_SIZE / 4 )
# temporary variables to test waku-rln-relay performance in the static group mode
const
STATIC_GROUP_SIZE * = 100
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# STATIC_GROUP_KEYS is a static list of 100 membership keys in the form of (identity key, identity commitment)
# keys are created locally, using createMembershipList proc from waku_rln_relay_utils module, and the results are hardcoded in here
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# this list is temporary and is created to test the performance of waku-rln-relay for the static groups
# in the later versions, this static hardcoded group will be replaced with a dynamic one
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STATIC_GROUP_KEYS * = @ [ ( " e9a4d05b1f539d65c59015a079ee89aabeafbcfc9734342d9559f81601e85417 " ,
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2021-09-17 17:31:25 +00:00
# STATIC_GROUP_MERKLE_ROOT is the root of the Merkle tree constructed from the STATIC_GROUP_KEYS above
# only identity commitments are used for the Merkle tree construction
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# the root is created locally, using createMembershipList proc from waku_rln_relay_utils module, and the result is hardcoded in here
STATIC_GROUP_MERKLE_ROOT * = " a1877a553eff12e1b21632a0545a916a5c5b8060ad7cc6c69956741134397b2d "
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const EPOCH_UNIT_SECONDS * = float64 ( 10 ) # the rln-relay epoch length in seconds
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const MAX_CLOCK_GAP_SECONDS * = 20 .0 # the maximum clock difference between peers in seconds
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# maximum allowed gap between the epochs of messages' RateLimitProofs
const MAX_EPOCH_GAP * = int64 ( MAX_CLOCK_GAP_SECONDS / EPOCH_UNIT_SECONDS )
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# Protobufs enc and init
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proc init * ( T : type RateLimitProof , buffer : seq [ byte ] ) : ProtoResult [ T ] =
var nsp : RateLimitProof
let pb = initProtoBuffer ( buffer )
var proof : seq [ byte ]
discard ? pb . getField ( 1 , proof )
discard nsp . proof . copyFrom ( proof )
var merkleRoot : seq [ byte ]
discard ? pb . getField ( 2 , merkleRoot )
discard nsp . merkleRoot . copyFrom ( merkleRoot )
var epoch : seq [ byte ]
discard ? pb . getField ( 3 , epoch )
discard nsp . epoch . copyFrom ( epoch )
var shareX : seq [ byte ]
discard ? pb . getField ( 4 , shareX )
discard nsp . shareX . copyFrom ( shareX )
var shareY : seq [ byte ]
discard ? pb . getField ( 5 , shareY )
discard nsp . shareY . copyFrom ( shareY )
var nullifier : seq [ byte ]
discard ? pb . getField ( 6 , nullifier )
discard nsp . nullifier . copyFrom ( nullifier )
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return ok ( nsp )
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proc encode * ( nsp : RateLimitProof ) : ProtoBuffer =
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var output = initProtoBuffer ( )
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output . write3 ( 1 , nsp . proof )
output . write3 ( 2 , nsp . merkleRoot )
output . write3 ( 3 , nsp . epoch )
output . write3 ( 4 , nsp . shareX )
output . write3 ( 5 , nsp . shareY )
output . write3 ( 6 , nsp . nullifier )
output . finish3 ( )
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return output