3 # Electrum - lightweight Bitcoin client
4 # Copyright (C) 2013 thomasv@gitorious
6 # This program is free software: you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation, either version 3 of the License, or
9 # (at your option) any later version.
11 # This program is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
21 from transaction import Transaction
23 class Account(object):
24 def __init__(self, v):
25 self.addresses = v.get('0', [])
26 self.change = v.get('1', [])
29 return {'0':self.addresses, '1':self.change}
31 def get_addresses(self, for_change):
32 return self.change[:] if for_change else self.addresses[:]
34 def create_new_address(self, for_change):
35 addresses = self.change if for_change else self.addresses
37 address = self.get_address( for_change, n)
38 addresses.append(address)
42 def get_address(self, for_change, n):
45 def get_pubkeys(self, sequence):
46 return [ self.get_pubkey( *sequence )]
50 class OldAccount(Account):
51 """ Privatekey(type,n) = Master_private_key + H(n|S|type) """
53 def __init__(self, v):
54 self.addresses = v.get(0, [])
55 self.change = v.get(1, [])
56 self.mpk = v['mpk'].decode('hex')
59 return {0:self.addresses, 1:self.change}
62 def mpk_from_seed(klass, seed):
64 secexp = klass.stretch_key(seed)
65 master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
66 master_public_key = master_private_key.get_verifying_key().to_string().encode('hex')
67 return master_public_key
70 def stretch_key(self,seed):
72 for i in range(100000):
73 seed = hashlib.sha256(seed + oldseed).digest()
74 return string_to_number( seed )
76 def get_sequence(self, for_change, n):
77 return string_to_number( Hash( "%d:%d:"%(n,for_change) + self.mpk ) )
79 def get_address(self, for_change, n):
80 pubkey = self.get_pubkey(for_change, n)
81 address = public_key_to_bc_address( pubkey.decode('hex') )
84 def get_pubkey(self, for_change, n):
87 z = self.get_sequence(for_change, n)
88 master_public_key = ecdsa.VerifyingKey.from_string( mpk, curve = SECP256k1 )
89 pubkey_point = master_public_key.pubkey.point + z*curve.generator
90 public_key2 = ecdsa.VerifyingKey.from_public_point( pubkey_point, curve = SECP256k1 )
91 return '04' + public_key2.to_string().encode('hex')
93 def get_private_key_from_stretched_exponent(self, for_change, n, secexp):
94 order = generator_secp256k1.order()
95 secexp = ( secexp + self.get_sequence(for_change, n) ) % order
96 pk = number_to_string( secexp, generator_secp256k1.order() )
98 return SecretToASecret( pk, compressed )
100 def get_private_key(self, seed, sequence):
101 for_change, n = sequence
102 secexp = self.stretch_key(seed)
103 return self.get_private_key_from_stretched_exponent(for_change, n, secexp)
105 def check_seed(self, seed):
107 secexp = self.stretch_key(seed)
108 master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
109 master_public_key = master_private_key.get_verifying_key().to_string()
110 if master_public_key != self.mpk:
111 print_error('invalid password (mpk)')
112 raise Exception('Invalid password')
115 def redeem_script(self, sequence):
119 class BIP32_Account(Account):
121 def __init__(self, v):
122 Account.__init__(self, v)
123 self.c = v['c'].decode('hex')
124 self.K = v['K'].decode('hex')
125 self.cK = v['cK'].decode('hex')
128 d = Account.dump(self)
129 d['c'] = self.c.encode('hex')
130 d['K'] = self.K.encode('hex')
131 d['cK'] = self.cK.encode('hex')
134 def get_address(self, for_change, n):
135 pubkey = self.get_pubkey(for_change, n)
136 address = public_key_to_bc_address( pubkey.decode('hex') )
139 def first_address(self):
140 return self.get_address(0,0)
142 def get_pubkey(self, for_change, n):
145 for i in [for_change, n]:
146 K, K_compressed, chain = CKD_prime(K, chain, i)
147 return K_compressed.encode('hex')
149 def redeem_script(self, sequence):
155 class BIP32_Account_2of2(BIP32_Account):
157 def __init__(self, v):
158 BIP32_Account.__init__(self, v)
159 self.c2 = v['c2'].decode('hex')
160 self.K2 = v['K2'].decode('hex')
161 self.cK2 = v['cK2'].decode('hex')
164 d = BIP32_Account.dump(self)
165 d['c2'] = self.c2.encode('hex')
166 d['K2'] = self.K2.encode('hex')
167 d['cK2'] = self.cK2.encode('hex')
170 def get_pubkey2(self, for_change, n):
173 for i in [for_change, n]:
174 K, K_compressed, chain = CKD_prime(K, chain, i)
175 return K_compressed.encode('hex')
177 def redeem_script(self, sequence):
179 pubkey1 = self.get_pubkey(chain, i)
180 pubkey2 = self.get_pubkey2(chain, i)
181 return Transaction.multisig_script([pubkey1, pubkey2], 2)
183 def get_address(self, for_change, n):
184 address = hash_160_to_bc_address(hash_160(self.redeem_script((for_change, n)).decode('hex')), 5)
187 def get_pubkeys(self, sequence):
188 return [ self.get_pubkey( *sequence ), self.get_pubkey2( *sequence )]
190 class BIP32_Account_2of3(BIP32_Account_2of2):
192 def __init__(self, v):
193 BIP32_Account_2of2.__init__(self, v)
194 self.c3 = v['c3'].decode('hex')
195 self.K3 = v['K3'].decode('hex')
196 self.cK3 = v['cK3'].decode('hex')
199 d = BIP32_Account_2of2.dump(self)
200 d['c3'] = self.c3.encode('hex')
201 d['K3'] = self.K3.encode('hex')
202 d['cK3'] = self.cK3.encode('hex')
205 def get_pubkey3(self, for_change, n):
208 for i in [for_change, n]:
209 K, K_compressed, chain = CKD_prime(K, chain, i)
210 return K_compressed.encode('hex')
212 def get_redeem_script(self, sequence):
214 pubkey1 = self.get_pubkey(chain, i)
215 pubkey2 = self.get_pubkey2(chain, i)
216 pubkey3 = self.get_pubkey3(chain, i)
217 return Transaction.multisig_script([pubkey1, pubkey2, pubkey3], 3)
219 def get_pubkeys(self, sequence):
220 return [ self.get_pubkey( *sequence ), self.get_pubkey2( *sequence ), self.get_pubkey3( *sequence )]