def get_sender_address(cls, tx):
"""
Get sender address from tx.
Recover public key from tx and then get address from public key, if tx has single signature type, or get
decoded sender address, if tx has multi signature type.
Args:
tx (dict): transaction dict
Returns:
Minter address (string)
"""
# Remember signature data and remove it from tx
signature_data = tx.pop('signature_data')
# If there is sender address in signature data (multi signature tx), return it
if signature_data.get('from_mx'):
return signature_data['from_mx']
# Otherwise (single signature tx), recover public key and get address from public key
# Unhexlify (convert to bin (ascii)) all non-numeric dict values
tx = MinterHelper.hex2bin_recursive(tx)
# Encode tx data to RLP
tx['data'] = rlp.encode(list(tx['data'].values()))
# Message
tx_rlp = rlp.encode(list(tx.values()))
_keccak = MinterHelper.keccak_hash(tx_rlp)
# Recover public key
public_key = MinterPrefix.PUBLIC_KEY + ECDSA.recover(_keccak, tuple(signature_data.values()))
return MinterWallet.get_address_from_public_key(public_key)
def recover_public_key(cls, tx):
"""
Recover public key from tx.
Args:
tx (dict): transaction dict
Returns:
public_key (string)
"""
# Remember signature data and remove it from tx
signature_data = tx.pop('signature_data')
# Unhexlify (convert to bin (ascii)) all non-numeric dict values
tx = MinterHelper.hex2bin_recursive(tx)
# Encode tx data to RLP
tx['data'] = rlp.encode(list(tx['data'].values()))
# Message
tx_rlp = rlp.encode(list(tx.values()))
_keccak = MinterHelper.keccak_hash(tx_rlp)
# Recover public key
public_key = ECDSA.recover(_keccak, tuple(signature_data.values()))
return MinterPrefix.PUBLIC_KEY + public_key
def from_raw(cls, rawcheck):
"""
Create check instance from raw check
Args:
rawcheck (str)
Returns:
MinterCheck
"""
# Remove check prefix and RLP decode it
rawcheck = MinterPrefix.remove_prefix(
string=rawcheck,
prefix=MinterPrefix.CHECK
)
rawcheck = binascii.unhexlify(rawcheck)
decoded = rlp.decode(rawcheck)
# Create MinterCheck instance
kwargs = {
'nonce': int(decoded[0].decode()),
'chain_id': MinterHelper.bin2int(decoded[1]),
'due_block': MinterHelper.bin2int(decoded[2]),
'coin': MinterConvertor.decode_coin_name(decoded[3]),
'value': MinterConvertor.convert_value(
value=MinterHelper.bin2int(decoded[4]),
to='bip'
),
'lock': binascii.hexlify(decoded[5]).decode(),
'signature': {
'v': MinterHelper.bin2int(decoded[6]),
'r': MinterHelper.bin2hex(decoded[7]),
's': MinterHelper.bin2hex(decoded[8])
}
}
check = MinterCheck(**kwargs)
# Recover owner address
msg_hash = cls.__hash(data=[
int(binascii.hexlify(str(check.nonce).encode()), 16),
check.chain_id,
check.due_block,
MinterConvertor.encode_coin_name(check.coin),
MinterConvertor.convert_value(value=check.value, to='pip'),
MinterHelper.hex2bin(check.lock)
])
public_key = ECDSA.recover(msg_hash, list(check.signature.values()))
public_key = MinterPrefix.PUBLIC_KEY + public_key
check.owner = MinterWallet.get_address_from_public_key(public_key)
return check
def from_raw(cls, rawcheck):
"""
Create check instance from raw check
Args:
rawcheck (str)
Returns:
MinterCheck
"""
# Remove check prefix and RLP decode it
rawcheck = MinterHelper.prefix_remove(rawcheck)
rawcheck = bytes.fromhex(rawcheck)
decoded = rlp.decode(rawcheck)
# Create MinterCheck instance
kwargs = {
'nonce': int(decoded[0].decode()),
'chain_id': int.from_bytes(decoded[1], 'big'),
'due_block': int.from_bytes(decoded[2], 'big'),
'coin': MinterHelper.decode_coin_name(decoded[3]),
'value': MinterHelper.to_bip(int.from_bytes(decoded[4], 'big')),
'gas_coin': MinterHelper.decode_coin_name(decoded[5]),
'lock': decoded[6].hex(),
'signature': {
'v': int.from_bytes(decoded[7], 'big'),
'r': decoded[8].hex(),
's': decoded[9].hex()
}
}
check = MinterCheck(**kwargs)
# Recover owner address
msg_hash = cls.__hash(data=[
int(str(check.nonce).encode().hex(), 16), check.chain_id,
check.due_block,
MinterHelper.encode_coin_name(check.coin),
MinterHelper.to_pip(check.value),
MinterHelper.encode_coin_name(check.gas_coin),
bytes.fromhex(check.lock)
])
public_key = ECDSA.recover(msg_hash, tuple(check.signature.values()))
public_key = MinterHelper.prefix_add(public_key, PREFIX_PUBKEY)
check.owner = MinterWallet.get_address_from_public_key(public_key)
return check