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