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Global is_proper_group size check subroutine.

This commit is contained in:
Hernán Di Pietro 2021-10-29 11:17:35 -03:00
parent a3d5ce05fc
commit 4dbb8dec95
2 changed files with 30 additions and 21 deletions
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23
teal/wormhole/pyteal/globals.py
View File

@ -6,4 +6,25 @@
#
# floor(guardian_count / SIGNATURES_PER_TRANSACTION)
#
SIGNATURES_PER_VERIFICATION_STEP = 6
SIGNATURES_PER_VERIFICATION_STEP = 6
from pyteal.ast import App, Seq, subroutine
from pyteal.ast.bytes import Bytes
from pyteal.ast.global_ import Global
from pyteal.ast.if_ import If
from pyteal.ast.int import Int
from pyteal.ast.return_ import Return
from pyteal.types import TealType
@subroutine.Subroutine(TealType.uint64)
def is_proper_group_size(gssize):
# Let G be the guardian count, N number of signatures per verification step, group must have CEIL(G/N) transactions.
q = gssize / Int(SIGNATURES_PER_VERIFICATION_STEP)
r = gssize % Int(SIGNATURES_PER_VERIFICATION_STEP)
return Seq([
If(r != Int(0)).Then(
Return(Global.group_size() == q + Int(1))
).Else(Return(Global.group_size() == q))
])

28
teal/wormhole/pyteal/vaa-processor.py
View File

@ -55,7 +55,7 @@ from pyteal.ast.unaryexpr import Len
from pyteal.ast.while_ import While
from pyteal.types import TealType
from globals import SIGNATURES_PER_VERIFICATION_STEP
from globals import SIGNATURES_PER_VERIFICATION_STEP, is_proper_group_size
METHOD = Txn.application_args[0]
VERIFY_ARG_GUARDIAN_KEY_SUBSET = Txn.application_args[1]
@ -112,20 +112,6 @@ def is_creator():
def min(a, b):
If(Int(a) < Int(b), Return(a), Return(b))
@Subroutine(TealType.uint64)
def is_proper_group_size():
# Let G be the guardian count, N number of signatures per verification step, group must have CEIL(G/N) transactions.
gssize = App.globalGet(Bytes("gssize"))
q = gssize / Int(SIGNATURES_PER_VERIFICATION_STEP)
r = gssize % Int(SIGNATURES_PER_VERIFICATION_STEP)
return Seq([
If(r != Int(0)).Then(
Return(Global.group_size() == q + Int(1))
).Else(Return(Global.group_size() == q))
])
@Subroutine(TealType.uint64)
def check_guardian_key_subset():
# Verify that the passed argument for guardian keys [i..j] match the
@ -192,6 +178,7 @@ def setvphash():
return Seq([
Assert(And(is_creator(),
Global.group_size() == Int(1),
Txn.application_args.length() == Int(2),
Len(Txn.application_args[1]) == Int(32))),
App.globalPut(Bytes("vphash"), Txn.application_args[1]),
Approve()
@ -200,7 +187,7 @@ def setvphash():
def verify():
# * Sender must be stateless logic.
# * Let N be the number of signatures per verification step, for the TXi in group, we verify signatures [i..j] where i = i*N, j = i*N+(N-1)
# * Let N be the number of signatures per verification step, for the TX(i) in group, we verify signatures [j..k] where j = i*N, k = j+(N-1)
# * Argument 1 must contain guardian public keys for guardians [i..j] (read by stateless logic)
# * Argument 2 must contain current guardian set size (read by stateless logic)
# * Passed guardian public keys [i..j] must match the current global state.
@ -208,10 +195,11 @@ def verify():
#
# Last TX in group will trigger VAA handling depending on payload.
return Seq([Assert(And(is_proper_group_size(),
Txn.sender() == STATELESS_LOGIC_HASH,
check_guardian_set_size(),
check_guardian_key_subset())),
return Seq([Assert(And(is_proper_group_size(App.globalGet(Bytes("gssize"))),
Txn.application_args.length() == Int(3),
Txn.sender() == STATELESS_LOGIC_HASH,
check_guardian_set_size(),
check_guardian_key_subset())),
If(Txn.group_index() == Global.group_size() -
Int(1)).Then(Return(commit_vaa())),
Approve()])