def from_string(cls, string):
"""TODO"""
try:
data = encoding.a2b_base58check(string)
except encoding.InvalidEncoding as e:
raise InvalidEncoding(e.message)
return cls.from_bytes(data)
def from_string(cls, string):
"""TODO"""
try:
data = encoding.a2b_base58check(string)
except encoding.InvalidEncoding as e:
raise InvalidEncoding(e.message)
return cls.from_bytes(data)
def test_from_invalid_wif(self):
too_short = encoding.b2a_base58check('a')
with raises(privkey.InvalidEncoding):
PrivateKey.from_wif(too_short)
too_long = encoding.b2a_base58check('a' * 30)
with raises(privkey.InvalidEncoding):
PrivateKey.from_wif(too_long)
valid = encoding.a2b_base58check(PrivateKey.generate().to_wif())
with raises(privkey.InvalidEncoding):
PrivateKey.from_wif(encoding.b2a_base58check(valid[:-1] + 'a'))
with raises(privkey.InvalidEncoding):
PrivateKey.from_wif(encoding.b2a_base58check('a' + valid[1:]))
def from_wif(cls, wif, backend=default_backend()):
"""Create a private key from its WIF encoding.
The Wallet Import Format encoding is used for serializing Bitcoin
private keys. For more info on this encoding, see:
https://en.bitcoin.it/wiki/Wallet_import_format
"""
# A WIF private key is base58check encoded
try:
data = bytearray(encoding.a2b_base58check(wif))
except encoding.Error as e:
raise InvalidEncoding(e.message)
# The first byte determines the network
try:
prefix = data.pop(0)
except IndexError:
raise InvalidEncoding('Invalid WIF length')
try:
network_ = network.Network.get_by_field('wif_prefix', prefix)
except network.UnknownNetwork as e:
raise InvalidEncoding(e.message)
# If the public key should be compressed-encoded, there will be an
# extra 1 byte at the end
key_size = tools.elliptic_curve_key_size(network_.curve)
compressed = True if len(data) == key_size + 1 else False
if compressed and data[-1] == 1:
data.pop(-1)
# What remains should be the raw private key exponent
return cls.from_bytes(bytes(data), network_, compressed, backend)
def from_wif(cls, wif, backend=default_backend()):
"""Create a private key from its WIF encoding.
The Wallet Import Format encoding is used for serializing Bitcoin
private keys. For more info on this encoding, see:
https://en.bitcoin.it/wiki/Wallet_import_format
"""
# A WIF private key is base58check encoded
try:
data = bytearray(encoding.a2b_base58check(wif))
except encoding.Error as e:
raise InvalidEncoding(e.message)
# The first byte determines the network
try:
prefix = data.pop(0)
except IndexError:
raise InvalidEncoding('Invalid WIF length')
try:
network_ = network.Network.get_by_field('wif_prefix', prefix)
except network.UnknownNetwork as e:
raise InvalidEncoding(e.message)
# If the public key should be compressed-encoded, there will be an
# extra 1 byte at the end
key_size = tools.elliptic_curve_key_size(network_.curve)
compressed = True if len(data) == key_size + 1 else False
if compressed and data[-1] == 1:
data.pop(-1)
# What remains should be the raw private key exponent
return cls.from_bytes(bytes(data), network_, compressed, backend)
