lib/account.py

   1 #!/usr/bin/env python
   2 #
   3 # Electrum - lightweight Bitcoin client
   4 # Copyright (C) 2013 thomasv@gitorious
   5 #
   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.
  10 #
  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.
  15 #
  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/>.
  18
  19
  20 from bitcoin import *
  21 from transaction import Transaction
  22
  23 class Account(object):
  24     def __init__(self, v):
  25         self.addresses = v.get('0', [])
  26         self.change = v.get('1', [])
  27
  28     def dump(self):
  29         return {'0':self.addresses, '1':self.change}
  30
  31     def get_addresses(self, for_change):
  32         return self.change[:] if for_change else self.addresses[:]
  33
  34     def create_new_address(self, for_change):
  35         addresses = self.change if for_change else self.addresses
  36         n = len(addresses)
  37         address = self.get_address( for_change, n)
  38         addresses.append(address)
  39         print address
  40         return address
  41
  42     def get_address(self, for_change, n):
  43         pass
  44
  45
  46
  47
  48 class OldAccount(Account):
  49     """  Privatekey(type,n) = Master_private_key + H(n|S|type)  """
  50
  51     def __init__(self, v):
  52         self.addresses = v.get(0, [])
  53         self.change = v.get(1, [])
  54         self.mpk = v['mpk'].decode('hex')
  55
  56     def dump(self):
  57         return {0:self.addresses, 1:self.change}
  58
  59     @classmethod
  60     def mpk_from_seed(klass, seed):
  61         curve = SECP256k1
  62         secexp = klass.stretch_key(seed)
  63         master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
  64         master_public_key = master_private_key.get_verifying_key().to_string().encode('hex')
  65         return master_public_key
  66
  67     @classmethod
  68     def stretch_key(self,seed):
  69         oldseed = seed
  70         for i in range(100000):
  71             seed = hashlib.sha256(seed + oldseed).digest()
  72         return string_to_number( seed )
  73
  74     def get_sequence(self, for_change, n):
  75         return string_to_number( Hash( "%d:%d:"%(n,for_change) + self.mpk ) )
  76
  77     def get_address(self, for_change, n):
  78         pubkey = self.get_pubkey(for_change, n)
  79         address = public_key_to_bc_address( pubkey.decode('hex') )
  80         return address
  81
  82     def get_pubkey(self, for_change, n):
  83         curve = SECP256k1
  84         mpk = self.mpk
  85         z = self.get_sequence(for_change, n)
  86         master_public_key = ecdsa.VerifyingKey.from_string( mpk, curve = SECP256k1 )
  87         pubkey_point = master_public_key.pubkey.point + z*curve.generator
  88         public_key2 = ecdsa.VerifyingKey.from_public_point( pubkey_point, curve = SECP256k1 )
  89         return '04' + public_key2.to_string().encode('hex')
  90
  91     def get_private_key_from_stretched_exponent(self, for_change, n, secexp):
  92         order = generator_secp256k1.order()
  93         secexp = ( secexp + self.get_sequence(for_change, n) ) % order
  94         pk = number_to_string( secexp, generator_secp256k1.order() )
  95         compressed = False
  96         return SecretToASecret( pk, compressed )
  97
  98     def get_private_key(self, seed, sequence):
  99         for_change, n = sequence
 100         secexp = self.stretch_key(seed)
 101         return self.get_private_key_from_stretched_exponent(for_change, n, secexp)
 102
 103     def check_seed(self, seed):
 104         curve = SECP256k1
 105         secexp = self.stretch_key(seed)
 106         master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 107         master_public_key = master_private_key.get_verifying_key().to_string().encode('hex')
 108         if master_public_key != self.mpk:
 109             print_error('invalid password (mpk)')
 110             raise BaseException('Invalid password')
 111         return True
 112
 113     def redeem_script(self, sequence):
 114         return None
 115
 116
 117 class BIP32_Account(Account):
 118
 119     def __init__(self, v):
 120         Account.__init__(self, v)
 121         self.c = v['c'].decode('hex')
 122         self.K = v['K'].decode('hex')
 123         self.cK = v['cK'].decode('hex')
 124
 125     def dump(self):
 126         d = Account.dump(self)
 127         d['c'] = self.c.encode('hex')
 128         d['K'] = self.K.encode('hex')
 129         d['cK'] = self.cK.encode('hex')
 130         return d
 131
 132     def get_address(self, for_change, n):
 133         pubkey = self.get_pubkey(for_change, n)
 134         address = public_key_to_bc_address( pubkey.decode('hex') )
 135         return address
 136
 137     def first_address(self):
 138         return self.get_address(0,0)
 139
 140     def get_pubkey(self, for_change, n):
 141         K = self.K
 142         chain = self.c
 143         for i in [for_change, n]:
 144             K, K_compressed, chain = CKD_prime(K, chain, i)
 145         return K_compressed.encode('hex')
 146
 147     def redeem_script(self, sequence):
 148         return None
 149
 150
 151
 152
 153 class BIP32_Account_2of2(BIP32_Account):
 154
 155     def __init__(self, v):
 156         BIP32_Account.__init__(self, v)
 157         self.c2 = v['c2'].decode('hex')
 158         self.K2 = v['K2'].decode('hex')
 159         self.cK2 = v['cK2'].decode('hex')
 160
 161     def dump(self):
 162         d = BIP32_Account.dump(self)
 163         d['c2'] = self.c2.encode('hex')
 164         d['K2'] = self.K2.encode('hex')
 165         d['cK2'] = self.cK2.encode('hex')
 166         return d
 167
 168     def get_pubkey2(self, for_change, n):
 169         K = self.K2
 170         chain = self.c2
 171         for i in [for_change, n]:
 172             K, K_compressed, chain = CKD_prime(K, chain, i)
 173         return K_compressed.encode('hex')
 174
 175     def redeem_script(self, sequence):
 176         chain, i = sequence
 177         pubkey1 = self.get_pubkey(chain, i)
 178         pubkey2 = self.get_pubkey2(chain, i)
 179         return Transaction.multisig_script([pubkey1, pubkey2], 2)
 180
 181     def get_address(self, for_change, n):
 182         address = hash_160_to_bc_address(hash_160(self.redeem_script((for_change, n)).decode('hex')), 5)
 183         return address
 184
 185
 186 class BIP32_Account_2of3(BIP32_Account_2of2):
 187
 188     def __init__(self, v):
 189         BIP32_Account_2of2.__init__(self, v)
 190         self.c3 = v['c3'].decode('hex')
 191         self.K3 = v['K3'].decode('hex')
 192         self.cK3 = v['cK3'].decode('hex')
 193
 194     def dump(self):
 195         d = BIP32_Account_2of2.dump(self)
 196         d['c3'] = self.c3.encode('hex')
 197         d['K3'] = self.K3.encode('hex')
 198         d['cK3'] = self.cK3.encode('hex')
 199         return d
 200
 201     def get_pubkey3(self, for_change, n):
 202         K = self.K3
 203         chain = self.c3
 204         for i in [for_change, n]:
 205             K, K_compressed, chain = CKD_prime(K, chain, i)
 206         return K_compressed.encode('hex')
 207
 208     def get_redeem_script(self, sequence):
 209         chain, i = sequence
 210         pubkey1 = self.get_pubkey(chain, i)
 211         pubkey2 = self.get_pubkey2(chain, i)
 212         pubkey3 = self.get_pubkey3(chain, i)
 213         return Transaction.multisig_script([pubkey1, pubkey2, pubkey3], 3)
 214
 215