def buildTxApdu(dongle_path, data):
"""
Generate apdu from data. This apdu is to be sent into the ledger key.
Argument:
dongle_path -- value returned by parseBip32Path
data -- bytes value returned by dposlib.core.crypto.getBytes
Return bytes
"""
path_len = len(dongle_path)
if len(data) > 255 - (path_len + 1):
data1 = data[:255 - (path_len + 1)]
data2 = data[255 - (path_len + 1):]
p1 = util.unhexlify("e0040040")
else:
data1 = data
data2 = util.unhexlify("")
p1 = util.unhexlify("e0048040")
return [
p1 + util.intasb(1 + path_len + len(data1)) +
util.intasb(path_len // 4) + dongle_path + data1,
util.unhexlify("e0048140") + util.intasb(len(data2)) +
data2 if len(data2) else None
]
def buildSignatureApdu(data, dongle_path, what="tx", schnorr=True):
apdu = []
path_len = len(dongle_path)
payload = len(data) + len(dongle_path) + 1
if payload > payloadMax:
raise CommException('Payload size:', payload, 'exceeds max length:',
payloadMax)
data = splitData(data, dongle_path)
if len(data) == 1:
first, body, last = data[0], [], None
else:
first, body, last = data[0], data[1:-1], data[-1]
p2 = p2_schnorr_leg if schnorr else p2_ecdsa
p1 = p1_single if last is None else p1_first
op = getattr(sys.modules[__name__], "op_sign_" + what)
apdu.append(
unhexlify(cla + op + p1 + p2) + intasb(path_len + 1 + len(first)) +
intasb(path_len // 4) + dongle_path + first)
for b in body:
apdu.append(unhexlify(cla + op + p1_more + p2) + intasb(len(b)) + b)
if last is not None:
apdu.append(
unhexlify(cla + op + p1_last + p2) + intasb(len(last)) + last)
return apdu
def buildPukApdu(dongle_path):
path_len = len(dongle_path)
return \
unhexlify(cla + op_puk + p1_non_confirm + p2_no_chaincode) + \
intasb(path_len + 1) + \
intasb(path_len // 4) + \
dongle_path
def buildPkeyApdu(dongle_path):
"""
Generate apdu to get public key from ledger key.
Argument:
dongle_path -- value returned by parseBip32Path
Return bytes
"""
path_len = len(dongle_path)
return util.unhexlify("e0020040") + util.intasb(1 + path_len) + \
util.intasb(path_len//4) + dongle_path
def buildPukApdu(dongle_path):
"""
Generate apdu to get public key from ledger key.
Args:
dongle_path (bytes): value returned by
[`dposlib.ark.ldgr.parseBip44Path`](
crypto.md#parsebip44path
)
Returns:
public key apdu data as bytes
"""
path_len = len(dongle_path)
return \
unhexlify(cla + op_puk + p1_non_confirm + p2_no_chaincode) + \
intasb(path_len + 1) + \
intasb(path_len // 4) + \
dongle_path
def getSignature(data, dongle_path, debug=False):
"""
Get ledger Nano S signature of given transaction.
Argument:
data -- transaction as bytes data returned by dposlib.core.crypto.getBytes
dongle_path -- value returned by parseBip32Path
Keyword argument:
debug -- flag to activate debug messages from ledger key [default: False]
Return str (hex)
"""
apdu1, apdu2 = buildTxApdu(dongle_path, data)
dongle = getDongle(debug)
result = dongle.exchange(bytes(apdu1), timeout=30)
if apdu2:
apdu = util.unhexlify("e0048140") + util.intasb(len(apdu2)) + apdu2
result = dongle.exchange(bytes(apdu), timeout=30)
dongle.close()
return util.hexlify(result)