forked from sarchar/Bitmsg
/
addressgen.py
159 lines (117 loc) · 5.32 KB
/
addressgen.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
#!/usr/bin/env python
import ctypes
import hashlib
from base58 import encode as base58_encode
################################################################################
################################################################################
ssl_library = ctypes.cdll.LoadLibrary('libeay32.dll')
NID_secp160k1 = 708
NID_secp256k1 = 714
def gen_ecdsa_pair():
k = ssl_library.EC_KEY_new_by_curve_name(NID_secp256k1)
if ssl_library.EC_KEY_generate_key(k) != 1:
raise Exception("internal error?")
bignum_private_key = ssl_library.EC_KEY_get0_private_key(k)
size = (ssl_library.BN_num_bits(bignum_private_key)+7)//8
storage = ctypes.create_string_buffer(size)
ssl_library.BN_bn2bin(bignum_private_key, storage)
private_key = storage.raw
size = ssl_library.i2o_ECPublicKey(k, 0)
storage = ctypes.create_string_buffer(size)
pstorage = ctypes.pointer(storage)
ssl_library.i2o_ECPublicKey(k, ctypes.byref(pstorage))
public_key = storage.raw
ssl_library.EC_KEY_free(k)
return public_key, private_key
def get_public_key(private_key):
k = ssl_library.EC_KEY_new_by_curve_name(NID_secp256k1)
storage = ctypes.create_string_buffer(private_key)
bignum_private_key = ssl_library.BN_new()
ssl_library.BN_bin2bn(storage, 32, bignum_private_key)
group = ssl_library.EC_KEY_get0_group(k)
point = ssl_library.EC_POINT_new(group)
ssl_library.EC_POINT_mul(group, point, bignum_private_key, None, None, None)
ssl_library.EC_KEY_set_private_key(k, bignum_private_key)
ssl_library.EC_KEY_set_public_key(k, point)
size = ssl_library.i2o_ECPublicKey(k, 0)
storage = ctypes.create_string_buffer(size)
pstorage = ctypes.pointer(storage)
ssl_library.i2o_ECPublicKey(k, ctypes.byref(pstorage))
public_key = storage.raw
ssl_library.EC_POINT_free(point)
ssl_library.BN_free(bignum_private_key)
ssl_library.EC_KEY_free(k)
return public_key
def generate_address(public_key, version=0):
assert isinstance(public_key, bytes)
if public_key[0] in (0x04, 0x03, 0x02):
s = public_key
else:
raise Exception("Unhandled ECDSA public key? type={}".format(public_key[0]))
return generate_address_from_data(s, version=version)
def generate_address_from_data(data, version=0):
assert isinstance(data, bytes)
hasher = hashlib.sha256()
hasher.update(data)
r = hasher.digest()
hasher = hashlib.new('ripemd160')
hasher.update(r)
r = hasher.digest()
a = base58_check(r, version=version)
if version == 0:
# Since '1' is a zero byte in base58, it won't be present in the output address.
i = 0
while r[i] == 0:
i += 1
return '1' + ('1' * i) + a
return a
def base58_check(src, version=0):
src = bytes([version]) + src
hasher = hashlib.sha256()
hasher.update(src)
r = hasher.digest()
hasher = hashlib.sha256()
hasher.update(r)
r = hasher.digest()
checksum = r[:4]
s = src + checksum
return base58_encode(int.from_bytes(s, 'big'))
def ecdsa_sign(private_key, hash):
k = ssl_library.EC_KEY_new_by_curve_name(NID_secp256k1)
storage = ctypes.create_string_buffer(private_key)
bignum_private_key = ssl_library.BN_new()
ssl_library.BN_bin2bn(storage, 32, bignum_private_key)
group = ssl_library.EC_KEY_get0_group(k)
point = ssl_library.EC_POINT_new(group)
ssl_library.EC_POINT_mul(group, point, bignum_private_key, None, None, None)
ssl_library.EC_KEY_set_private_key(k, bignum_private_key)
ssl_library.EC_KEY_set_public_key(k, point)
assert isinstance(hash, bytes)
dgst = ctypes.cast((ctypes.c_ubyte*len(hash))(*[int(x) for x in hash]), ctypes.POINTER(ctypes.c_ubyte))
siglen = ctypes.c_int(ssl_library.ECDSA_size(k))
signature = ctypes.create_string_buffer(siglen.value)
if ssl_library.ECDSA_sign(0, dgst, len(hash), signature, ctypes.byref(siglen), k) == 0:
raise Exception("Failed to sign signature")
signature = signature.raw[:siglen.value]
ssl_library.EC_POINT_free(point)
ssl_library.BN_free(bignum_private_key)
ssl_library.EC_KEY_free(k)
return signature
def test():
public_key, private_key = gen_ecdsa_pair()
hex_private_key = ''.join(["{:02x}".format(i) for i in private_key])
assert len(hex_private_key) == 64
print("ECDSA private key (random number / secret exponent) = {}".format(hex_private_key))
print("ECDSA public key = {}".format(''.join(['{:02x}'.format(i) for i in public_key])))
bitcoin_private_key = base58_check(private_key, version=128)
print("Bitcoin private key (Base58Check) = {}, len={}".format(bitcoin_private_key, len(bitcoin_private_key)))
addr = generate_address(public_key)
print("Bitcoin 1-Address: {} (length={})".format(addr, len(addr)))
addr = generate_address(public_key, version=5)
print("Bitcoin 3-Address: {} (length={})".format(addr, len(addr)))
hasher = hashlib.md5()
hasher.update('Hello, world!'.encode('ascii'))
hash = hasher.digest()
print("Signature of MD5SUM('Hello, world!'): {}".format(''.join(['{:02x}'.format(i) for i in ecdsa_sign(private_key, hash)])))
if __name__ == "__main__":
test()