def fromExtendedKey(xkey, public=False):
"""
Create a BIP32Key by importing from extended private or public key string
If public is True, return a public-only key regardless of input type.
"""
# Sanity checks
raw = Base58.check_decode(xkey)
if len(raw) != 78:
raise ValueError("extended key format wrong length")
# Verify address version/type
version = raw[:4]
if version == EX_MAIN_PRIVATE:
keytype = 'xprv'
elif version == EX_MAIN_PUBLIC:
keytype = 'xpub'
else:
raise ValueError("unknown extended key version")
# Extract remaining fields
depth = ord(raw[4])
fpr = raw[5:9]
child = struct.unpack(">L", raw[9:13])[0]
chain = raw[13:45]
secret = raw[45:78]
# Extract private key or public key point
if keytype == 'xprv':
secret = secret[1:]
else:
# Recover public curve point from compressed key
lsb = ord(secret[0]) & 1
x = string_to_int(secret[1:])
ys = (x**3 + 7) % FIELD_ORDER # y^2 = x^3 + 7 mod p
y = sqrt_mod(ys, FIELD_ORDER)
if y & 1 != lsb:
y = FIELD_ORDER - y
point = ecdsa.ellipticcurve.Point(SECP256k1.curve, x, y)
secret = ecdsa.VerifyingKey.from_public_point(point,
curve=SECP256k1)
is_pubkey = (keytype == 'xpub')
key = BIP32Key(secret=secret,
chain=chain,
depth=depth,
index=child,
fpr=fpr,
public=is_pubkey)
if not is_pubkey and public:
key = key.SetPublic()
return key
def fromExtendedKey(xkey, public=False):
"""
Create a BIP32Key by importing from extended private or public key string
If public is True, return a public-only key regardless of input type.
"""
# Sanity checks
raw = Base58.check_decode(xkey)
if len(raw) != 78:
raise ValueError("extended key format wrong length")
# Verify address version/type
version = raw[:4]
if version == EX_MAIN_PRIVATE:
keytype = 'xprv'
elif version == EX_MAIN_PUBLIC:
keytype = 'xpub'
else:
raise ValueError("unknown extended key version")
# Extract remaining fields
depth = ord(raw[4])
fpr = raw[5:9]
child = struct.unpack(">L", raw[9:13])[0]
chain = raw[13:45]
secret = raw[45:78]
# Extract private key or public key point
if keytype == 'xprv':
secret = secret[1:]
else:
# Recover public curve point from compressed key
lsb = ord(secret[0]) & 1
x = string_to_int(secret[1:])
ys = (x**3+7) % FIELD_ORDER # y^2 = x^3 + 7 mod p
y = sqrt_mod(ys, FIELD_ORDER)
if y & 1 != lsb:
y = FIELD_ORDER-y
point = ecdsa.ellipticcurve.Point(SECP256k1.curve, x, y)
secret = ecdsa.VerifyingKey.from_public_point(point, curve=SECP256k1)
is_pubkey = (keytype == 'xpub')
key = BIP32Key(secret=secret, chain=chain, depth=depth, index=child, fpr=fpr, public=is_pubkey)
if not is_pubkey and public:
key = key.SetPublic()
return key
def fromExtendedKey(xkey, public=False):
"""
Create a BIP32Key by importing from extended private or public key string
If public is True, return a public-only key regardless of input type.
"""
# Sanity checks
raw = Base58.check_decode(xkey)
if len(raw) != 78:
raise ValueError("extended key format wrong length")
# Verify address version/type
version = raw[:4]
tversion = codecs.encode(version, "hex")
if tversion in query_lsit(testnet=False):
is_testnet = False
is_pubkey = False
elif tversion in query_lsit(testnet=True):
is_testnet = True
is_pubkey = False
elif tversion in query_lsit(public=True):
is_testnet = False
is_pubkey = True
elif tversion in query_lsit(public=True, testnet=True):
is_testnet = True
is_pubkey = True
else:
raise ValueError("unknown extended key version")
# Extract remaining fields
# Python 2.x compatibility
if type(raw[4]) == int:
depth = raw[4]
else:
depth = ord(raw[4])
fpr = raw[5:9]
child = struct.unpack(">L", raw[9:13])[0]
chain = raw[13:45]
secret = raw[45:78]
# Extract private key or public key point
if not is_pubkey:
secret = secret[1:]
else:
# Recover public curve point from compressed key
# Python3 FIX
lsb = secret[0] & 1 if type(
secret[0]) == int else ord(secret[0]) & 1
x = string_to_int(secret[1:])
ys = (x**3 + 7) % FIELD_ORDER # y^2 = x^3 + 7 mod p
y = sqrt_mod(ys, FIELD_ORDER)
if y & 1 != lsb:
y = FIELD_ORDER - y
point = ecdsa.ellipticcurve.Point(SECP256k1.curve, x, y)
secret = ecdsa.VerifyingKey.from_public_point(point,
curve=SECP256k1)
key = BIP32Key(secret=secret,
chain=chain,
depth=depth,
index=child,
fpr=fpr,
public=is_pubkey,
testnet=is_testnet)
if not is_pubkey and public:
key = key.SetPublic()
return key
