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 i18n import _
  22 from transaction import Transaction
  23
  24 class Account(object):
  25     def __init__(self, v):
  26         self.addresses = v.get('0', [])
  27         self.change = v.get('1', [])
  28
  29     def dump(self):
  30         return {'0':self.addresses, '1':self.change}
  31
  32     def get_addresses(self, for_change):
  33         return self.change[:] if for_change else self.addresses[:]
  34
  35     def create_new_address(self, for_change):
  36         addresses = self.change if for_change else self.addresses
  37         n = len(addresses)
  38         address = self.get_address( for_change, n)
  39         addresses.append(address)
  40         print address
  41         return address
  42
  43     def get_address(self, for_change, n):
  44         pass
  45
  46     def get_pubkeys(self, sequence):
  47         return [ self.get_pubkey( *sequence )]
  48
  49     def has_change(self):
  50         return True
  51
  52 class PendingAccount(Account):
  53     def __init__(self, v):
  54         self.addresses = [ v['pending'] ]
  55         self.change = []
  56
  57     def has_change(self):
  58         return False
  59
  60 class ImportedAccount(Account):
  61     def __init__(self, d):
  62         self.addresses = d.keys()
  63
  64     def has_change(self):
  65         return False
  66
  67
  68 class OldAccount(Account):
  69     """  Privatekey(type,n) = Master_private_key + H(n|S|type)  """
  70
  71     def __init__(self, v):
  72         self.addresses = v.get(0, [])
  73         self.change = v.get(1, [])
  74         self.mpk = v['mpk'].decode('hex')
  75
  76     def dump(self):
  77         return {0:self.addresses, 1:self.change}
  78
  79     @classmethod
  80     def mpk_from_seed(klass, seed):
  81         curve = SECP256k1
  82         secexp = klass.stretch_key(seed)
  83         master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
  84         master_public_key = master_private_key.get_verifying_key().to_string().encode('hex')
  85         return master_public_key
  86
  87     @classmethod
  88     def stretch_key(self,seed):
  89         oldseed = seed
  90         for i in range(100000):
  91             seed = hashlib.sha256(seed + oldseed).digest()
  92         return string_to_number( seed )
  93
  94     def get_sequence(self, for_change, n):
  95         return string_to_number( Hash( "%d:%d:"%(n,for_change) + self.mpk ) )
  96
  97     def get_address(self, for_change, n):
  98         pubkey = self.get_pubkey(for_change, n)
  99         address = public_key_to_bc_address( pubkey.decode('hex') )
 100         return address
 101
 102     def get_pubkey(self, for_change, n):
 103         curve = SECP256k1
 104         mpk = self.mpk
 105         z = self.get_sequence(for_change, n)
 106         master_public_key = ecdsa.VerifyingKey.from_string( mpk, curve = SECP256k1 )
 107         pubkey_point = master_public_key.pubkey.point + z*curve.generator
 108         public_key2 = ecdsa.VerifyingKey.from_public_point( pubkey_point, curve = SECP256k1 )
 109         return '04' + public_key2.to_string().encode('hex')
 110
 111     def get_private_key_from_stretched_exponent(self, for_change, n, secexp):
 112         order = generator_secp256k1.order()
 113         secexp = ( secexp + self.get_sequence(for_change, n) ) % order
 114         pk = number_to_string( secexp, generator_secp256k1.order() )
 115         compressed = False
 116         return SecretToASecret( pk, compressed )
 117
 118     def get_private_key(self, seed, sequence):
 119         for_change, n = sequence
 120         secexp = self.stretch_key(seed)
 121         return self.get_private_key_from_stretched_exponent(for_change, n, secexp)
 122
 123     def check_seed(self, seed):
 124         curve = SECP256k1
 125         secexp = self.stretch_key(seed)
 126         master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 127         master_public_key = master_private_key.get_verifying_key().to_string()
 128         if master_public_key != self.mpk:
 129             print_error('invalid password (mpk)', self.mpk.encode('hex'), master_public_key.encode('hex'))
 130             raise Exception('Invalid password')
 131         return True
 132
 133     def redeem_script(self, sequence):
 134         return None
 135
 136     def get_master_pubkeys(self):
 137         return [self.mpk]
 138
 139     def get_type(self):
 140         return _('Old Electrum format')
 141
 142     def get_keyID(self, sequence):
 143         a, b = sequence
 144         return 'old(%s,%d,%d)'%(self.mpk,a,b)
 145
 146
 147
 148 class BIP32_Account(Account):
 149
 150     def __init__(self, v):
 151         Account.__init__(self, v)
 152         self.xpub = v['xpub']
 153
 154     def dump(self):
 155         d = Account.dump(self)
 156         d['xpub'] = self.xpub
 157         return d
 158
 159     def get_address(self, for_change, n):
 160         pubkey = self.get_pubkey(for_change, n)
 161         address = public_key_to_bc_address( pubkey.decode('hex') )
 162         return address
 163
 164     def first_address(self):
 165         return self.get_address(0,0)
 166
 167     def get_master_pubkeys(self):
 168         return [self.xpub]
 169
 170     def get_pubkey_from_x(self, xpub, for_change, n):
 171         _, _, _, c, cK = deserialize_xkey(xpub)
 172         for i in [for_change, n]:
 173             cK, c = CKD_pub(cK, c, i)
 174         return cK.encode('hex')
 175
 176     def get_pubkeys(self, sequence):
 177         return sorted(map(lambda x: self.get_pubkey_from_x(x, *sequence), self.get_master_pubkeys()))
 178
 179     def get_pubkey(self, for_change, n):
 180         return self.get_pubkeys((for_change, n))[0]
 181
 182     def redeem_script(self, sequence):
 183         return None
 184
 185     def get_type(self):
 186         return _('Standard 1 of 1')
 187
 188     def get_keyID(self, sequence):
 189         s = '/' + '/'.join( map(lambda x:str(x), sequence) )
 190         return '&'.join( map(lambda x: 'bip32(%s,%s)'%(x, s), self.get_master_pubkeys() ) )
 191
 192
 193 class BIP32_Account_2of2(BIP32_Account):
 194
 195     def __init__(self, v):
 196         BIP32_Account.__init__(self, v)
 197         self.xpub2 = v['xpub2']
 198
 199     def dump(self):
 200         d = BIP32_Account.dump(self)
 201         d['xpub2'] = self.xpub2
 202         return d
 203
 204     def redeem_script(self, sequence):
 205         pubkeys = self.get_pubkeys(sequence)
 206         return Transaction.multisig_script(pubkeys, 2)
 207
 208     def get_address(self, for_change, n):
 209         address = hash_160_to_bc_address(hash_160(self.redeem_script((for_change, n)).decode('hex')), 5)
 210         return address
 211
 212     def get_master_pubkeys(self):
 213         return [self.xpub, self.xpub2]
 214
 215     def get_type(self):
 216         return _('Multisig 2 of 2')
 217
 218
 219 class BIP32_Account_2of3(BIP32_Account_2of2):
 220
 221     def __init__(self, v):
 222         BIP32_Account_2of2.__init__(self, v)
 223         self.xpub3 = v['xpub3']
 224
 225     def dump(self):
 226         d = BIP32_Account_2of2.dump(self)
 227         d['xpub3'] = self.xpub3
 228         return d
 229
 230     def get_master_pubkeys(self):
 231         return [self.xpub, self.xpub2, self.xpub3]
 232
 233     def get_type(self):
 234         return _('Multisig 2 of 3')
 235
 236
 237
 238