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cryptoaddress.py
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import ctypes
import ctypes.util
from base58 import base58_check_decode, base58_check_encode, rhash, dhash, base58_get_version
from hashlib import sha256
from base64 import b64decode
from re import match
ssl = ctypes.cdll.LoadLibrary (ctypes.util.find_library ('ssl') or 'libeay32')
# this specifies the curve used with ECDSA.
NID_secp256k1 = 714 # from openssl/obj_mac.h
POINT_CONVERSION_COMPRESSED = 2
POINT_CONVERSION_UNCOMPRESSED = 4
BITCOIN_MAGIC = "\x18Bitcoin Signed Message:\n"
TERRACOIN_MAGIC = "\x1ATerracoin Signed Message:\n"
# Thx to Sam Devlin for the ctypes magic 64-bit fix.
def check_result (val, func, args):
if val == 0:
raise ValueError
else:
return ctypes.c_void_p (val)
ssl.EC_KEY_new_by_curve_name.restype = ctypes.c_void_p
ssl.EC_KEY_new_by_curve_name.errcheck = check_result
class CryptoAddress:
def __init__(self, privkey=None, privkey_format='base58', passphrase=None, version=0, eckey=None, compressed=False):
if eckey is not None:
self.eckey = eckey
else:
self.eckey = ssl.EC_KEY_new_by_curve_name(NID_secp256k1)
self.eckey_group = ssl.EC_KEY_get0_group(self.eckey)
self.version = version
self.compressed = compressed
compression = (POINT_CONVERSION_COMPRESSED if self.compressed else POINT_CONVERSION_UNCOMPRESSED)
ssl.EC_KEY_set_conv_form(self.eckey, compression)
if eckey is None:
if passphrase is not None:
privkey = CryptoAddress.passphrase_to_private_key(passphrase)
self.set_private_key(privkey, format='256-bit')
elif privkey is not None:
self.set_private_key(privkey, format=privkey_format)
else:
ssl.EC_KEY_generate_key(self.eckey)
def __del__(self):
if ssl:
ssl.EC_KEY_free(self.eckey)
self.eckey = None
@staticmethod
def passphrase_to_private_key(passphrase, rounds=1):
private_key = passphrase.encode('utf8')
for i in xrange(rounds):
private_key = sha256(private_key).digest()
return private_key.encode('hex')
def set_private_key(self, key, format='base58'):
if format=='base58':
key = base58_check_decode(key, 128+self.version)
else:
key.decode('hex')
self.compressed = len(key) == 33
key = key[0:32]
privkey = ssl.BN_bin2bn(key, len(key), ssl.BN_new())
pubkey = ssl.EC_POINT_new(self.eckey_group)
ssl.EC_POINT_mul(self.eckey_group, pubkey, privkey, None, None, None)
ssl.EC_KEY_set_private_key(self.eckey, privkey)
ssl.EC_KEY_set_public_key(self.eckey, pubkey)
def get_private_key(self, format='base58'):
bn = ssl.EC_KEY_get0_private_key(self.eckey);
bytes = (ssl.BN_num_bits(bn) + 7) / 8
mb = ctypes.create_string_buffer(bytes)
n = ssl.BN_bn2bin(bn, mb);
if format=='base58':
payload = mb.raw
if self.compressed:
payload = mb.raw + chr(1)
return base58_check_encode(payload, 128+self.version)
return mb.raw.encode('hex')
def get_public_key(self, encode='hex'):
size = ssl.i2o_ECPublicKey(self.eckey, 0)
mb = ctypes.create_string_buffer(size)
ssl.i2o_ECPublicKey(self.eckey, ctypes.byref(ctypes.pointer(mb)))
return mb.raw.encode('hex') if encode=='hex' else mb.raw
def get_address(self):
pubkey = self.get_public_key(encode='raw')
hash160 = rhash(pubkey)
addr = base58_check_encode(hash160, self.version)
return addr
def to_json(self):
return {
"address": self.get_address(),
"public_key": self.get_public_key(),
"private_key": {
'base58': self.get_private_key(),
'256-bit': self.get_private_key(format='256-bit')
}
}
@staticmethod
def verify_address(address, version=0):
address = address.strip()
if match(r"[a-zA-Z1-9]{27,35}$", address) is None:
return False
return base58_get_version(address)==version
@staticmethod
def verify_public_key(pubkey):
hash160 = rhash(pubkey.decode('hex'))
addr = base58_check_encode(hash160, version=0)
return CryptoAddress.verify_address(addr)
@staticmethod
def verify_message(address, signature, message):
eckey = ssl.EC_KEY_new_by_curve_name (NID_secp256k1)
message = BITCOIN_MAGIC + chr(len(message)) + message
hash = dhash(message)
sig = b64decode(signature)
if len(sig) != 65:
raise BaseException("Wrong encoding")
nV = ord(sig[0])
if nV < 27 or nV >= 35:
return False
if nV >= 31:
ssl.EC_KEY_set_conv_form(eckey, POINT_CONVERSION_COMPRESSED)
nV -= 4
r = ssl.BN_bin2bn (sig[1:33], 32, ssl.BN_new())
s = ssl.BN_bin2bn (sig[33:], 32, ssl.BN_new())
msg = hash
msglen = len(hash)
recid = nV - 27
check = False
#ECDSA_SIG_recover_key_GFp(eckey, r, s, msg, msglen, recid, check)
n = 0
i = recid / 2
group = ssl.EC_KEY_get0_group(eckey)
ctx = ssl.BN_CTX_new()
ssl.BN_CTX_start(ctx)
order = ssl.BN_CTX_get(ctx)
ssl.EC_GROUP_get_order(group, order, ctx)
x = ssl.BN_CTX_get(ctx)
ssl.BN_copy(x, order);
ssl.BN_mul_word(x, i);
ssl.BN_add(x, x, r)
field = ssl.BN_CTX_get(ctx)
ssl.EC_GROUP_get_curve_GFp(group, field, None, None, ctx)
if (ssl.BN_cmp(x, field) >= 0):
return False
R = ssl.EC_POINT_new(group)
ssl.EC_POINT_set_compressed_coordinates_GFp(group, R, x, recid % 2, ctx)
if check:
O = ssl.EC_POINT_new(group)
ssl.EC_POINT_mul(group, O, None, R, order, ctx)
if ssl.EC_POINT_is_at_infinity(group, O):
return False
Q = ssl.EC_POINT_new(group)
n = ssl.EC_GROUP_get_degree(group)
e = ssl.BN_CTX_get(ctx)
ssl.BN_bin2bn(msg, msglen, e)
if 8 * msglen > n: ssl.BN_rshift(e, e, 8 - (n & 7))
zero = ssl.BN_CTX_get(ctx)
ssl.BN_set_word(zero, 0)
ssl.BN_mod_sub(e, zero, e, order, ctx)
rr = ssl.BN_CTX_get(ctx);
ssl.BN_mod_inverse(rr, r, order, ctx)
sor = ssl.BN_CTX_get(ctx)
ssl.BN_mod_mul(sor, s, rr, order, ctx)
eor = ssl.BN_CTX_get(ctx)
ssl.BN_mod_mul(eor, e, rr, order, ctx)
ssl.EC_POINT_mul(group, Q, eor, R, sor, ctx)
ssl.EC_KEY_set_public_key(eckey, Q)
eckey = CryptoAddress(eckey=eckey, compressed=True)
addr = eckey.get_address()
#print "addr: %s\n" % addr
return (address == addr)
@staticmethod
def add_public_keys(pubkey1_hex, pubkey2_hex, version=0):
eckey = ssl.EC_KEY_new_by_curve_name(NID_secp256k1)
group = ssl.EC_KEY_get0_group(eckey)
pubkey1_point = ssl.EC_POINT_hex2point(group, pubkey1_hex, None, None)
pubkey2_point = ssl.EC_POINT_hex2point(group, pubkey2_hex, None, None)
ssl.EC_POINT_add(group, pubkey1_point, pubkey1_point, pubkey2_point, None)
ssl.EC_KEY_set_public_key(eckey, pubkey1_point)
eckey = CryptoAddress(eckey=eckey)
pubkey, addr = get_pubkey_and_address(eckey, version)
return {
'public_key': eckey.get_public_key(),
'address': eckey.get_address()
}