{.push raises: [Defect].} import std/tables, options, chronos, stint, web3, eth/keys, libp2p/protobuf/minprotobuf, stew/arrayops, ../../utils/protobuf ## Bn256 and RLN are Nim wrappers for the data types used in ## the rln library https://github.com/kilic/rln/blob/3bbec368a4adc68cd5f9bfae80b17e1bbb4ef373/src/ffi.rs type Bn256* = pointer type RLN*[E] = pointer type # 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] 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] ZKSNARK* = array[256, byte] Epoch* = array[32, byte] # Custom data types defined for waku rln relay ------------------------- type MembershipKeyPair* = object ## user's identity key (a secret key) which is selected randomly ## see details in https://hackmd.io/tMTLMYmTR5eynw2lwK9n1w?view#Membership idKey*: IDKey # hash of user's identity key generated by # Poseidon hash function implemented in rln lib # more details in https://hackmd.io/tMTLMYmTR5eynw2lwK9n1w?view#Membership idCommitment*: IDCommitment type RateLimitProof* = object ## RateLimitProof holds the public inputs to rln circuit as ## defined in https://hackmd.io/tMTLMYmTR5eynw2lwK9n1w?view#Public-Inputs ## the `proof` field carries the actual zkSNARK proof proof*: ZKSNARK ## the root of Merkle tree used for the generation of the `proof` merkleRoot*: MerkleNode ## the epoch used for the generation of the `proof` epoch*: Epoch ## shareX and shareY are shares of user's identity key ## these shares are created using Shamir secret sharing scheme ## 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 type MembershipIndex* = uint type ProofMetadata* = object nullifier*: Nullifier shareX*: MerkleNode shareY*: MerkleNode type WakuRLNRelay* = ref object membershipKeyPair*: MembershipKeyPair # membershipIndex denotes the index of a leaf in the Merkle tree # that contains the pk of the current peer # this index is used to retrieve the peer's authentication path membershipIndex*: MembershipIndex membershipContractAddress*: Address 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 ethAccountPrivateKey*: Option[PrivateKey] rlnInstance*: RLN[Bn256] pubsubTopic*: string # the pubsub topic for which rln relay is mounted # 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 # the log of nullifiers and Shamir shares of the past messages grouped per epoch nullifierLog*: Table[Epoch, seq[ProofMetadata]] type MessageValidationResult* {.pure.} = enum Valid, Invalid, Spam # inputs of the membership contract constructor # TODO may be able to make these constants private and put them inside the waku_rln_relay_utils const MEMBERSHIP_FEE* = 1000000000000000.u256 # the current implementation of the rln lib supports a circuit for Merkle tree with depth 20 MERKLE_TREE_DEPTH* = 20 # 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/" const # the size of poseidon hash output in bits HASH_BIT_SIZE* = 256 # 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 # 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 # 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 STATIC_GROUP_KEYS* = @[("e9a4d05b1f539d65c59015a079ee89aabeafbcfc9734342d9559f81601e85417", "b74d3a5b3200ab1126fbee393496f33da497d4d9a7c56693f44d6155c0c34e13"), ( "27b2bfc25257e53819beaf36ce1070007e04e7aad2e440a1f1fc066f59a61123", "522ce51aff96041e79a8476f508fb9661f146f189e288f83cb4837517cfc0127"), ( "66392eaae6674267c55fe393d39443ba90317a709d6e8f92a9f3e4abc18eff1d", 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above # only identity commitments are used for the Merkle tree construction # 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" const EPOCH_UNIT_SECONDS* = float64(10) # the rln-relay epoch length in seconds const MAX_CLOCK_GAP_SECONDS* = 20.0 # the maximum clock difference between peers in seconds # maximum allowed gap between the epochs of messages' RateLimitProofs const MAX_EPOCH_GAP* = int64(MAX_CLOCK_GAP_SECONDS/EPOCH_UNIT_SECONDS) # Protobufs enc and init 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) return ok(nsp) proc encode*(nsp: RateLimitProof): ProtoBuffer = var output = initProtoBuffer() 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() return output