1/11/2022, 10:14:27 PM

0

65

89f67bb871351a1629d66676e4bd92bbacb23bd0649b890542ef98f1b664a497

991 ( 76.2 dTAU )

submission

submit_contract

b788a2769e9116affd32c9aaee08eaa5ba9a7fd2558903a144af771bf5a7f8759bd5cec3f1734ba8a6abdaad98df9341c5a99a4ced370324beec420e6f5b9d04

# con_ozark_v1 import con_verifier_optimized as verifier I = importlib # Main variables denomination = Variable() token_contract = Variable() total_deposit_balance = Variable() # Merkle Tree Variables commitments = Hash(default_value=None) commitment_history = Hash(default_value=None) nullifier_hashes = Hash(default_value=None) current_root_index = Variable() next_index = Variable() roots_var = Variable() filled_subtrees_var = Variable() ROOT_HISTORY_SIZE = 30 TREE_LEVELS = 20 @construct def init(denomination_value: int = 100_000, token_contract_value: str = 'currency'): assert TREE_LEVELS > 0, 'tree_levels should be greater than zero' assert TREE_LEVELS < 32, 'tree_levels should be less than 32' filled_subtrees = [] roots = [None] * ROOT_HISTORY_SIZE for i in range(TREE_LEVELS): filled_subtrees.append(zeros(i)) roots[0] = zeros(TREE_LEVELS-1) # Set variables current_root_index.set(0) next_index.set(0) roots_var.set(roots) filled_subtrees_var.set(filled_subtrees) total_deposit_balance.set(0) denomination.set(denomination_value) token_contract.set(token_contract_value) @export def deposit(commitment: str): assert commitments[commitment] is None, 'The commitment has been submitted.' insert(commitment) commitments[commitment] = True commitment_history[next_index.get()] = commitment process_deposit(ctx.caller) def process_deposit(caller: str): amount = denomination.get() token = I.import_module(token_contract.get()) token.transfer_from( to=ctx.this, amount=amount, main_account=caller ) total_deposit_balance.set(total_deposit_balance.get() + amount) @export def withdraw(a: list, b: list, c: list, root: str, nullifier_hash: str, recipient: str, relayer: str = '0', fee: str = '0', refund: str = '0'): assert int(fee) < denomination.get(), 'Fee exceeds transfer value.' assert nullifier_hashes[nullifier_hash] is None, 'The note has already been spent.' assert is_known_root(root), 'Cannot find your merkle root.' assert verifier.verify_proof( a=a, b=b, c=c, inputs=[ int(root, 10), int(nullifier_hash, 10), int(recipient, 16), int(relayer, 16), int(fee, 10), int(refund, 10), ], ), 'Invalid withdraw proof.' nullifier_hashes[nullifier_hash] = True process_withdraw(recipient, relayer, int(fee, 10), int(refund, 10)) def process_withdraw(recipient: str, relayer: str, fee: int, refund: int): assert refund == 0, 'Refund not supported.' amount = denomination.get() - fee assert amount > 0, 'Nothing to withdraw.' token = I.import_module(token_contract.get()) token.transfer( to=recipient, amount=amount ) if fee > 0: token.transfer( to=relayer, amount=fee ) total_deposit_balance.set(total_deposit_balance.get() - (amount + fee)) # Merkle tree # con_merkle_tree_v1 SEED = "mimcsponge" NROUNDS = 220 curve_order = 21888242871839275222246405745257275088548364400416034343698204186575808495617 def get_cts(i: int = None) -> int: cts = [0, 7120861356467848435263064379192047478074060781135320967663101236819528304084, 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6936272626871035740815028148058841877090860312517423346335878088297448888663, 17297554111853491139852678417579991271009602631577069694853813331124433680030, 16641596134749940573104316021365063031319260205559553673368334842484345864859, 7400481189785154329569470986896455371037813715804007747228648863919991399081, 2273205422216987330510475127669563545720586464429614439716564154166712854048, 15162538063742142685306302282127534305212832649282186184583465569986719234456, 5628039096440332922248578319648483863204530861778160259559031331287721255522, 16085392195894691829567913404182676871326863890140775376809129785155092531260, 14227467863135365427954093998621993651369686288941275436795622973781503444257, 18224457394066545825553407391290108485121649197258948320896164404518684305122, 274945154732293792784580363548970818611304339008964723447672490026510689427, 11050822248291117548220126630860474473945266276626263036056336623671308219529, 2119542016932434047340813757208803962484943912710204325088879681995922344971, 0] return cts def mimc_hash(xL_in: str, xR_in: str, k: str) -> tuple: xL = int(xL_in) xR = int(xR_in) k = int(k) cts = get_cts() for i in range(NROUNDS): c = cts[i] t = mimc_add(xL, k) if i == 0 else mimc_add(mimc_add(xL, k), c) xR_tmp = int(xR) if i < NROUNDS - 1: xR = xL xL = mimc_add(xR_tmp, mimc_exp(t, 5)) else: xR = mimc_add(xR_tmp, mimc_exp(t, 5)) return mimc_affine(xL), mimc_affine(xR) def mimc_multi_hash(arr: list, key: str = None, num_outputs: int = 1): key = int(key or 0) r = 0 c = 0 for i in range(len(arr)): r = mimc_add(r, int(arr[i])) r, c = mimc_hash(r, c, key) outputs = [mimc_affine(r)] for i in range(1, num_outputs): r, c = mimc_hash(r, c, key) outputs.append(mimc_affine(r)) return outputs def hash_left_right(left: str, right: str) -> str: assert int(left) < curve_order, 'left should be inside the field' assert int(right) < curve_order, 'right should be inside the field' return str(mimc_multi_hash([left, right])[0]) def mimc_add(self: int, other: int) -> int: return (self + other) % curve_order def mimc_mul(self: int, other: int) -> int: return (self * other) % curve_order def mimc_square(self: int) -> int: return mimc_mul(self, self) def mimc_shr(self: int, b: int) -> int: return self >> b def mimc_exp(base: int, e: int) -> int: res = 1 rem = int(e) ex = base while rem != 0: if rem % 2 == 1: res = mimc_mul(res, ex) ex = mimc_square(ex) rem = mimc_shr(rem, 1) return res def mimc_affine(self: int) -> int: aux = self nq = -curve_order if aux < 0: if aux <= nq: aux = aux % curve_order if aux < 0: aux = aux + curve_order else: if aux >= curve_order: aux = aux % curve_order return aux def insert(leaf: str) -> int: current_index = next_index.get() tree_levels = TREE_LEVELS assert current_index != 2**tree_levels, 'Merkle tree is full. No more leaves can be added.' filled_subtrees = filled_subtrees_var.get() roots = roots_var.get() current_level_hash = str(leaf) for i in range(tree_levels): if current_index % 2 == 0: left = current_level_hash right = zeros(i) filled_subtrees[i] = current_level_hash else: left = filled_subtrees[i] right = current_level_hash current_level_hash = hash_left_right(left, right) current_index /= 2 root_index = current_root_index.get() next_root_index = int((root_index + 1) % ROOT_HISTORY_SIZE) roots[next_root_index] = current_level_hash next_index.set(int(current_index + 1)) current_root_index.set(next_root_index) roots_var.set(roots) filled_subtrees_var.set(filled_subtrees) return current_index def is_known_root(root: str) -> bool: if root is None or len(root) == 0 or int(root) == 0: return False i = current_root_index.get() current_index = i roots = roots_var.get() first_loop = True while first_loop or i != current_index: first_loop = False if root == roots[i]: return True if i == 0: i = ROOT_HISTORY_SIZE i -= 1 return False def zeros(i: int) -> int: if i == 0: return 0x2fe54c60d3acabf3343a35b6eba15db4821b340f76e741e2249685ed4899af6c elif i == 1: return 0x256a6135777eee2fd26f54b8b7037a25439d5235caee224154186d2b8a52e31d elif i == 2: return 0x1151949895e82ab19924de92c40a3d6f7bcb60d92b00504b8199613683f0c200 elif i == 3: return 0x20121ee811489ff8d61f09fb89e313f14959a0f28bb428a20dba6b0b068b3bdb elif i == 4: return 0x0a89ca6ffa14cc462cfedb842c30ed221a50a3d6bf022a6a57dc82ab24c157c9 elif i == 5: return 0x24ca05c2b5cd42e890d6be94c68d0689f4f21c9cec9c0f13fe41d566dfb54959 elif i == 6: return 0x1ccb97c932565a92c60156bdba2d08f3bf1377464e025cee765679e604a7315c elif i == 7: return 0x19156fbd7d1a8bf5cba8909367de1b624534ebab4f0f79e003bccdd1b182bdb4 elif i == 8: return 0x261af8c1f0912e465744641409f622d466c3920ac6e5ff37e36604cb11dfff80 elif i == 9: return 0x0058459724ff6ca5a1652fcbc3e82b93895cf08e975b19beab3f54c217d1c007 elif i == 10: return 0x1f04ef20dee48d39984d8eabe768a70eafa6310ad20849d4573c3c40c2ad1e30 elif i == 11: return 0x1bea3dec5dab51567ce7e200a30f7ba6d4276aeaa53e2686f962a46c66d511e5 elif i == 12: return 0x0ee0f941e2da4b9e31c3ca97a40d8fa9ce68d97c084177071b3cb46cd3372f0f elif i == 13: return 0x1ca9503e8935884501bbaf20be14eb4c46b89772c97b96e3b2ebf3a36a948bbd elif i == 14: return 0x133a80e30697cd55d8f7d4b0965b7be24057ba5dc3da898ee2187232446cb108 elif i == 15: return 0x13e6d8fc88839ed76e182c2a779af5b2c0da9dd18c90427a644f7e148a6253b6 elif i == 16: return 0x1eb16b057a477f4bc8f572ea6bee39561098f78f15bfb3699dcbb7bd8db61854 elif i == 17: return 0x0da2cb16a1ceaabf1c16b838f7a9e3f2a3a3088d9e0a6debaa748114620696ea elif i == 18: return 0x24a3b3d822420b14b5d8cb6c28a574f01e98ea9e940551d2ebd75cee12649f9d elif i == 19: return 0x198622acbd783d1b0d9064105b1fc8e4d8889de95c4c519b3f635809fe6afc05 elif i == 20: return 0x29d7ed391256ccc3ea596c86e933b89ff339d25ea8ddced975ae2fe30b5296d4 elif i == 21: return 0x19be59f2f0413ce78c0c3703a3a5451b1d7f39629fa33abd11548a76065b2967 elif i == 22: return 0x1ff3f61797e538b70e619310d33f2a063e7eb59104e112e95738da1254dc3453 elif i == 23: return 0x10c16ae9959cf8358980d9dd9616e48228737310a10e2b6b731c1a548f036c48 elif i == 24: return 0x0ba433a63174a90ac20992e75e3095496812b652685b5e1a2eae0b1bf4e8fcd1 elif i == 25: return 0x019ddb9df2bc98d987d0dfeca9d2b643deafab8f7036562e627c3667266a044c elif i == 26: return 0x2d3c88b23175c5a5565db928414c66d1912b11acf974b2e644caaac04739ce99 elif i == 27: return 0x2eab55f6ae4e66e32c5189eed5c470840863445760f5ed7e7b69b2a62600f354 elif i == 28: return 0x002df37a2642621802383cf952bf4dd1f32e05433beeb1fd41031fb7eace979d elif i == 29: return 0x104aeb41435db66c3e62feccc1d6f5d98d0a0ed75d1374db457cf462e3a1f427 elif i == 30: return 0x1f3c6fd858e9a7d4b0d1f38e256a09d81d5a5e3c963987e2d4b814cfab7c6ebb elif i == 31: return 0x2c7a07d20dff79d01fecedc1134284a8d08436606c93693b67e333f671bf69cc else: assert False, "Index out of bounds"

con_ozark_v1