Skip to content
Permalink
release-0.2.0
Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
Go to file
 
 
Cannot retrieve contributors at this time
# SPDX-License-Identifier: MIT
# OpenZeppelin Contracts for Cairo v0.2.0 (account/library.cairo)
%lang starknet
from starkware.cairo.common.registers import get_fp_and_pc
from starkware.starknet.common.syscalls import get_contract_address
from starkware.cairo.common.signature import verify_ecdsa_signature
from starkware.cairo.common.cairo_builtins import HashBuiltin, SignatureBuiltin, BitwiseBuiltin
from starkware.cairo.common.alloc import alloc
from starkware.cairo.common.uint256 import Uint256
from starkware.cairo.common.memcpy import memcpy
from starkware.cairo.common.math import split_felt
from starkware.cairo.common.bool import TRUE
from starkware.starknet.common.syscalls import call_contract, get_caller_address, get_tx_info
from starkware.cairo.common.cairo_secp.signature import verify_eth_signature_uint256
from openzeppelin.introspection.ERC165 import ERC165
from openzeppelin.utils.constants import IACCOUNT_ID
#
# Storage
#
@storage_var
func Account_current_nonce() -> (res: felt):
end
@storage_var
func Account_public_key() -> (res: felt):
end
#
# Structs
#
struct Call:
member to: felt
member selector: felt
member calldata_len: felt
member calldata: felt*
end
# Tmp struct introduced while we wait for Cairo
# to support passing `[AccountCall]` to __execute__
struct AccountCallArray:
member to: felt
member selector: felt
member data_offset: felt
member data_len: felt
end
namespace Account:
#
# Initializer
#
func initializer{
syscall_ptr : felt*,
pedersen_ptr : HashBuiltin*,
range_check_ptr
}(_public_key: felt):
Account_public_key.write(_public_key)
ERC165.register_interface(IACCOUNT_ID)
return()
end
#
# Guards
#
func assert_only_self{syscall_ptr : felt*}():
let (self) = get_contract_address()
let (caller) = get_caller_address()
with_attr error_message("Account: caller is not this account"):
assert self = caller
end
return ()
end
#
# Getters
#
func get_public_key{
syscall_ptr : felt*,
pedersen_ptr : HashBuiltin*,
range_check_ptr
}() -> (res: felt):
let (res) = Account_public_key.read()
return (res=res)
end
func get_nonce{
syscall_ptr : felt*,
pedersen_ptr : HashBuiltin*,
range_check_ptr
}() -> (res: felt):
let (res) = Account_current_nonce.read()
return (res=res)
end
#
# Setters
#
func set_public_key{
syscall_ptr : felt*,
pedersen_ptr : HashBuiltin*,
range_check_ptr
}(new_public_key: felt):
assert_only_self()
Account_public_key.write(new_public_key)
return ()
end
#
# Business logic
#
func is_valid_signature{
syscall_ptr : felt*,
pedersen_ptr : HashBuiltin*,
range_check_ptr,
ecdsa_ptr: SignatureBuiltin*
}(
hash: felt,
signature_len: felt,
signature: felt*
) -> (is_valid: felt):
let (_public_key) = Account_public_key.read()
# This interface expects a signature pointer and length to make
# no assumption about signature validation schemes.
# But this implementation does, and it expects a (sig_r, sig_s) pair.
let sig_r = signature[0]
let sig_s = signature[1]
verify_ecdsa_signature(
message=hash,
public_key=_public_key,
signature_r=sig_r,
signature_s=sig_s)
return (is_valid=TRUE)
end
func is_valid_eth_signature{
syscall_ptr : felt*,
pedersen_ptr : HashBuiltin*,
bitwise_ptr: BitwiseBuiltin*,
range_check_ptr
}(
hash: felt,
signature_len: felt,
signature: felt*
) -> (is_valid: felt):
alloc_locals
let (_public_key) = get_public_key()
let (__fp__, _) = get_fp_and_pc()
# This interface expects a signature pointer and length to make
# no assumption about signature validation schemes.
# But this implementation does, and it expects a the sig_v, sig_r,
# sig_s, and hash elements.
let sig_v : felt = signature[0]
let sig_r : Uint256 = Uint256(low=signature[1], high=signature[2])
let sig_s : Uint256 = Uint256(low=signature[3], high=signature[4])
let (high, low) = split_felt(hash)
let msg_hash : Uint256 = Uint256(low=low, high=high)
let (local keccak_ptr : felt*) = alloc()
with keccak_ptr:
verify_eth_signature_uint256(
msg_hash=msg_hash,
r=sig_r,
s=sig_s,
v=sig_v,
eth_address=_public_key)
end
return (is_valid=TRUE)
end
func execute{
syscall_ptr : felt*,
pedersen_ptr : HashBuiltin*,
range_check_ptr,
bitwise_ptr: BitwiseBuiltin*
}(
call_array_len: felt,
call_array: AccountCallArray*,
calldata_len: felt,
calldata: felt*,
nonce: felt
) -> (response_len: felt, response: felt*):
alloc_locals
let (__fp__, _) = get_fp_and_pc()
let (tx_info) = get_tx_info()
let (local ecdsa_ptr : SignatureBuiltin*) = alloc()
with ecdsa_ptr:
# validate transaction
with_attr error_message("Account: invalid signature"):
let (is_valid) = is_valid_signature(tx_info.transaction_hash, tx_info.signature_len, tx_info.signature)
assert is_valid = TRUE
end
end
return _unsafe_execute(call_array_len, call_array, calldata_len, calldata, nonce)
end
func eth_execute{
syscall_ptr : felt*,
pedersen_ptr : HashBuiltin*,
range_check_ptr,
bitwise_ptr: BitwiseBuiltin*
}(
call_array_len: felt,
call_array: AccountCallArray*,
calldata_len: felt,
calldata: felt*,
nonce: felt
) -> (response_len: felt, response: felt*):
alloc_locals
let (__fp__, _) = get_fp_and_pc()
let (tx_info) = get_tx_info()
# validate transaction
with_attr error_message("Account: invalid secp256k1 signature"):
let (is_valid) = is_valid_eth_signature(tx_info.transaction_hash, tx_info.signature_len, tx_info.signature)
assert is_valid = TRUE
end
return _unsafe_execute(call_array_len, call_array, calldata_len, calldata, nonce)
end
func _unsafe_execute{
syscall_ptr : felt*,
pedersen_ptr : HashBuiltin*,
range_check_ptr,
bitwise_ptr: BitwiseBuiltin*
}(
call_array_len: felt,
call_array: AccountCallArray*,
calldata_len: felt,
calldata: felt*,
nonce: felt
) -> (response_len: felt, response: felt*):
alloc_locals
let (caller) = get_caller_address()
with_attr error_message("Account: no reentrant call"):
assert caller = 0
end
# validate nonce
let (_current_nonce) = Account_current_nonce.read()
with_attr error_message("Account: nonce is invalid"):
assert _current_nonce = nonce
end
# bump nonce
Account_current_nonce.write(_current_nonce + 1)
# TMP: Convert `AccountCallArray` to 'Call'.
let (calls : Call*) = alloc()
_from_call_array_to_call(call_array_len, call_array, calldata, calls)
let calls_len = call_array_len
# execute call
let (response : felt*) = alloc()
let (response_len) = _execute_list(calls_len, calls, response)
return (response_len=response_len, response=response)
end
func _execute_list{syscall_ptr: felt*}(
calls_len: felt,
calls: Call*,
response: felt*
) -> (response_len: felt):
alloc_locals
# if no more calls
if calls_len == 0:
return (0)
end
# do the current call
let this_call: Call = [calls]
let res = call_contract(
contract_address=this_call.to,
function_selector=this_call.selector,
calldata_size=this_call.calldata_len,
calldata=this_call.calldata
)
# copy the result in response
memcpy(response, res.retdata, res.retdata_size)
# do the next calls recursively
let (response_len) = _execute_list(calls_len - 1, calls + Call.SIZE, response + res.retdata_size)
return (response_len + res.retdata_size)
end
func _from_call_array_to_call{syscall_ptr: felt*}(
call_array_len: felt,
call_array: AccountCallArray*,
calldata: felt*,
calls: Call*
):
# if no more calls
if call_array_len == 0:
return ()
end
# parse the current call
assert [calls] = Call(
to=[call_array].to,
selector=[call_array].selector,
calldata_len=[call_array].data_len,
calldata=calldata + [call_array].data_offset
)
# parse the remaining calls recursively
_from_call_array_to_call(call_array_len - 1, call_array + AccountCallArray.SIZE, calldata, calls + Call.SIZE)
return ()
end
end