lib/wallet.py

   1 #!/usr/bin/env python
   2 #
   3 # Electrum - lightweight Bitcoin client
   4 # Copyright (C) 2011 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 import sys, base64, os, re, hashlib, copy, operator, ast, threading, random
  21 import aes, ecdsa
  22 from ecdsa.util import string_to_number, number_to_string
  23
  24 ############ functions from pywallet #####################
  25
  26 addrtype = 0
  27
  28 def hash_160(public_key):
  29     try:
  30         md = hashlib.new('ripemd160')
  31         md.update(hashlib.sha256(public_key).digest())
  32         return md.digest()
  33     except:
  34         import ripemd
  35         md = ripemd.new(hashlib.sha256(public_key).digest())
  36         return md.digest()
  37
  38
  39 def public_key_to_bc_address(public_key):
  40     h160 = hash_160(public_key)
  41     return hash_160_to_bc_address(h160)
  42
  43 def hash_160_to_bc_address(h160):
  44     vh160 = chr(addrtype) + h160
  45     h = Hash(vh160)
  46     addr = vh160 + h[0:4]
  47     return b58encode(addr)
  48
  49 def bc_address_to_hash_160(addr):
  50     bytes = b58decode(addr, 25)
  51     return bytes[1:21]
  52
  53 def encode_point(pubkey, compressed=False):
  54     order = generator_secp256k1.order()
  55     p = pubkey.pubkey.point
  56     x_str = ecdsa.util.number_to_string(p.x(), order)
  57     y_str = ecdsa.util.number_to_string(p.y(), order)
  58     if compressed:
  59         return chr(2 + (p.y() & 1)) + x_str
  60     else:
  61         return chr(4) + pubkey.to_string() #x_str + y_str
  62
  63 __b58chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
  64 __b58base = len(__b58chars)
  65
  66 def b58encode(v):
  67     """ encode v, which is a string of bytes, to base58.
  68     """
  69
  70     long_value = 0L
  71     for (i, c) in enumerate(v[::-1]):
  72         long_value += (256**i) * ord(c)
  73
  74     result = ''
  75     while long_value >= __b58base:
  76         div, mod = divmod(long_value, __b58base)
  77         result = __b58chars[mod] + result
  78         long_value = div
  79     result = __b58chars[long_value] + result
  80
  81     # Bitcoin does a little leading-zero-compression:
  82     # leading 0-bytes in the input become leading-1s
  83     nPad = 0
  84     for c in v:
  85         if c == '\0': nPad += 1
  86         else: break
  87
  88     return (__b58chars[0]*nPad) + result
  89
  90 def b58decode(v, length):
  91     """ decode v into a string of len bytes
  92     """
  93     long_value = 0L
  94     for (i, c) in enumerate(v[::-1]):
  95         long_value += __b58chars.find(c) * (__b58base**i)
  96
  97     result = ''
  98     while long_value >= 256:
  99         div, mod = divmod(long_value, 256)
 100         result = chr(mod) + result
 101         long_value = div
 102     result = chr(long_value) + result
 103
 104     nPad = 0
 105     for c in v:
 106         if c == __b58chars[0]: nPad += 1
 107         else: break
 108
 109     result = chr(0)*nPad + result
 110     if length is not None and len(result) != length:
 111         return None
 112
 113     return result
 114
 115
 116 def Hash(data):
 117     return hashlib.sha256(hashlib.sha256(data).digest()).digest()
 118
 119 def EncodeBase58Check(vchIn):
 120     hash = Hash(vchIn)
 121     return b58encode(vchIn + hash[0:4])
 122
 123 def DecodeBase58Check(psz):
 124     vchRet = b58decode(psz, None)
 125     key = vchRet[0:-4]
 126     csum = vchRet[-4:]
 127     hash = Hash(key)
 128     cs32 = hash[0:4]
 129     if cs32 != csum:
 130         return None
 131     else:
 132         return key
 133
 134 def PrivKeyToSecret(privkey):
 135     return privkey[9:9+32]
 136
 137 def SecretToASecret(secret):
 138     vchIn = chr(addrtype+128) + secret
 139     return EncodeBase58Check(vchIn)
 140
 141 def ASecretToSecret(key):
 142     vch = DecodeBase58Check(key)
 143     if vch and vch[0] == chr(addrtype+128):
 144         return vch[1:]
 145     else:
 146         return False
 147
 148 ########### end pywallet functions #######################
 149
 150 # URL decode
 151 _ud = re.compile('%([0-9a-hA-H]{2})', re.MULTILINE)
 152 urldecode = lambda x: _ud.sub(lambda m: chr(int(m.group(1), 16)), x)
 153
 154
 155 def int_to_hex(i, length=1):
 156     s = hex(i)[2:].rstrip('L')
 157     s = "0"*(2*length - len(s)) + s
 158     return s.decode('hex')[::-1].encode('hex')
 159
 160
 161 # AES
 162 EncodeAES = lambda secret, s: base64.b64encode(aes.encryptData(secret,s))
 163 DecodeAES = lambda secret, e: aes.decryptData(secret, base64.b64decode(e))
 164
 165
 166
 167 # secp256k1, http://www.oid-info.com/get/1.3.132.0.10
 168 _p = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2FL
 169 _r = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141L
 170 _b = 0x0000000000000000000000000000000000000000000000000000000000000007L
 171 _a = 0x0000000000000000000000000000000000000000000000000000000000000000L
 172 _Gx = 0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798L
 173 _Gy = 0x483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8L
 174 curve_secp256k1 = ecdsa.ellipticcurve.CurveFp( _p, _a, _b )
 175 generator_secp256k1 = ecdsa.ellipticcurve.Point( curve_secp256k1, _Gx, _Gy, _r )
 176 oid_secp256k1 = (1,3,132,0,10)
 177 SECP256k1 = ecdsa.curves.Curve("SECP256k1", curve_secp256k1, generator_secp256k1, oid_secp256k1 )
 178
 179
 180 def filter(s):
 181     out = re.sub('( [^\n]*|)\n','',s)
 182     out = out.replace(' ','')
 183     out = out.replace('\n','')
 184     return out
 185
 186 def raw_tx( inputs, outputs, for_sig = None ):
 187     s  = int_to_hex(1,4)                                     +   '     version\n'
 188     s += int_to_hex( len(inputs) )                           +   '     number of inputs\n'
 189     for i in range(len(inputs)):
 190         _, _, p_hash, p_index, p_script, pubkey, sig = inputs[i]
 191         s += p_hash.decode('hex')[::-1].encode('hex')        +  '     prev hash\n'
 192         s += int_to_hex(p_index,4)                           +  '     prev index\n'
 193         if for_sig is None:
 194             sig = sig + chr(1)                               # hashtype
 195             script  = int_to_hex( len(sig))                  +  '     push %d bytes\n'%len(sig)
 196             script += sig.encode('hex')                      +  '     sig\n'
 197             pubkey = chr(4) + pubkey
 198             script += int_to_hex( len(pubkey))               +  '     push %d bytes\n'%len(pubkey)
 199             script += pubkey.encode('hex')                   +  '     pubkey\n'
 200         elif for_sig==i:
 201             script = p_script                                +  '     scriptsig \n'
 202         else:
 203             script=''
 204         s += int_to_hex( len(filter(script))/2 )             +  '     script length \n'
 205         s += script
 206         s += "ffffffff"                                      +  '     sequence\n'
 207     s += int_to_hex( len(outputs) )                          +  '     number of outputs\n'
 208     for output in outputs:
 209         addr, amount = output
 210         s += int_to_hex( amount, 8)                          +  '     amount: %d\n'%amount
 211         script = '76a9'                                      # op_dup, op_hash_160
 212         script += '14'                                       # push 0x14 bytes
 213         script += bc_address_to_hash_160(addr).encode('hex')
 214         script += '88ac'                                     # op_equalverify, op_checksig
 215         s += int_to_hex( len(filter(script))/2 )             +  '     script length \n'
 216         s += script                                          +  '     script \n'
 217     s += int_to_hex(0,4)                                     # lock time
 218     if for_sig is not None: s += int_to_hex(1, 4)            # hash type
 219     return s
 220
 221
 222
 223
 224 def format_satoshis(x, is_diff=False, num_zeros = 0):
 225     from decimal import Decimal
 226     s = Decimal(x)
 227     sign, digits, exp = s.as_tuple()
 228     digits = map(str, digits)
 229     while len(digits) < 9:
 230         digits.insert(0,'0')
 231     digits.insert(-8,'.')
 232     s = ''.join(digits).rstrip('0')
 233     if sign:
 234         s = '-' + s
 235     elif is_diff:
 236         s = "+" + s
 237
 238     p = s.find('.')
 239     s += "0"*( 1 + num_zeros - ( len(s) - p ))
 240     s += " "*( 9 - ( len(s) - p ))
 241     s = " "*( 5 - ( p )) + s
 242     return s
 243
 244
 245 from version import ELECTRUM_VERSION, SEED_VERSION
 246 from interface import DEFAULT_SERVERS
 247
 248
 249
 250
 251 class Wallet:
 252     def __init__(self, gui_callback = lambda: None):
 253
 254         self.electrum_version = ELECTRUM_VERSION
 255         self.seed_version = SEED_VERSION
 256         self.gui_callback = gui_callback
 257
 258         self.gap_limit = 5           # configuration
 259         self.fee = 100000
 260         self.num_zeros = 0
 261         self.master_public_key = ''
 262
 263         # saved fields
 264         self.use_encryption = False
 265         self.addresses = []          # receiving addresses visible for user
 266         self.change_addresses = []   # addresses used as change
 267         self.seed = ''               # encrypted
 268         self.history = {}
 269         self.labels = {}             # labels for addresses and transactions
 270         self.aliases = {}            # aliases for addresses
 271         self.authorities = {}        # trusted addresses
 272         self.frozen_addresses = []
 273         self.prioritized_addresses = []
 274         self.expert_mode = False
 275
 276         self.receipts = {}           # signed URIs
 277         self.receipt = None          # next receipt
 278         self.addressbook = []        # outgoing addresses, for payments
 279
 280         # not saved
 281         self.tx_history = {}
 282
 283         self.imported_keys = {}
 284         self.remote_url = None
 285
 286         self.was_updated = True
 287         self.blocks = -1
 288         self.banner = ''
 289
 290         # there is a difference between self.up_to_date and self.is_up_to_date()
 291         # self.is_up_to_date() returns true when all requests have been answered and processed
 292         # self.up_to_date is true when the wallet is synchronized (stronger requirement)
 293         self.up_to_date_event = threading.Event()
 294         self.up_to_date_event.clear()
 295         self.up_to_date = False
 296         self.lock = threading.Lock()
 297         self.tx_event = threading.Event()
 298
 299         self.pick_random_server()
 300
 301
 302
 303     def pick_random_server(self):
 304         self.server = random.choice( DEFAULT_SERVERS )         # random choice when the wallet is created
 305
 306     def is_up_to_date(self):
 307         return self.interface.responses.empty() and not self.interface.unanswered_requests
 308
 309     def set_server(self, server):
 310         # raise an error if the format isnt correct
 311         a,b,c = server.split(':')
 312         b = int(b)
 313         assert c in ['t','h','n']
 314         # set the server
 315         if server != self.server:
 316             self.server = server
 317             self.save()
 318             self.interface.is_connected = False  # this exits the polling loop
 319             self.interface.poke()
 320
 321     def set_path(self, wallet_path):
 322
 323         if wallet_path is not None:
 324             self.path = wallet_path
 325         else:
 326             # backward compatibility: look for wallet file in the default data directory
 327             if "HOME" in os.environ:
 328                 wallet_dir = os.path.join( os.environ["HOME"], '.electrum')
 329             elif "LOCALAPPDATA" in os.environ:
 330                 wallet_dir = os.path.join( os.environ["LOCALAPPDATA"], 'Electrum' )
 331             elif "APPDATA" in os.environ:
 332                 wallet_dir = os.path.join( os.environ["APPDATA"], 'Electrum' )
 333             else:
 334                 raise BaseException("No home directory found in environment variables.")
 335
 336             if not os.path.exists( wallet_dir ): os.mkdir( wallet_dir )
 337             self.path = os.path.join( wallet_dir, 'electrum.dat' )
 338
 339     def import_key(self, keypair, password):
 340         address, key = keypair.split(':')
 341         if not self.is_valid(address):
 342             raise BaseException('Invalid Bitcoin address')
 343         if address in self.all_addresses():
 344             raise BaseException('Address already in wallet')
 345         b = ASecretToSecret( key )
 346         if not b:
 347             raise BaseException('Unsupported key format')
 348         secexp = int( b.encode('hex'), 16)
 349         private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve=SECP256k1 )
 350         # sanity check
 351         public_key = private_key.get_verifying_key()
 352         if not address == public_key_to_bc_address( '04'.decode('hex') + public_key.to_string() ):
 353             raise BaseException('Address does not match private key')
 354         self.imported_keys[address] = self.pw_encode( key, password )
 355
 356     def new_seed(self, password):
 357         seed = "%032x"%ecdsa.util.randrange( pow(2,128) )
 358         #self.init_mpk(seed)
 359         # encrypt
 360         self.seed = self.pw_encode( seed, password )
 361
 362
 363     def init_mpk(self,seed):
 364         # public key
 365         curve = SECP256k1
 366         secexp = self.stretch_key(seed)
 367         master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 368         self.master_public_key = master_private_key.get_verifying_key().to_string()
 369
 370     def all_addresses(self):
 371         return self.addresses + self.change_addresses + self.imported_keys.keys()
 372
 373     def is_mine(self, address):
 374         return address in self.all_addresses()
 375
 376     def is_change(self, address):
 377         return address in self.change_addresses
 378
 379     def is_valid(self,addr):
 380         ADDRESS_RE = re.compile('[1-9A-HJ-NP-Za-km-z]{26,}\\Z')
 381         if not ADDRESS_RE.match(addr): return False
 382         try:
 383             h = bc_address_to_hash_160(addr)
 384         except:
 385             return False
 386         return addr == hash_160_to_bc_address(h)
 387
 388     def stretch_key(self,seed):
 389         oldseed = seed
 390         for i in range(100000):
 391             seed = hashlib.sha256(seed + oldseed).digest()
 392         return string_to_number( seed )
 393
 394     def get_sequence(self,n,for_change):
 395         return string_to_number( Hash( "%d:%d:"%(n,for_change) + self.master_public_key ) )
 396
 397     def get_private_key_base58(self, address, password):
 398         pk = self.get_private_key(address, password)
 399         if pk is None: return None
 400         return SecretToASecret( pk )
 401
 402     def get_private_key(self, address, password):
 403         """  Privatekey(type,n) = Master_private_key + H(n|S|type)  """
 404         order = generator_secp256k1.order()
 405
 406         if address in self.imported_keys.keys():
 407             b = self.pw_decode( self.imported_keys[address], password )
 408             if not b: return None
 409             b = ASecretToSecret( b )
 410             secexp = int( b.encode('hex'), 16)
 411         else:
 412             if address in self.addresses:
 413                 n = self.addresses.index(address)
 414                 for_change = False
 415             elif address in self.change_addresses:
 416                 n = self.change_addresses.index(address)
 417                 for_change = True
 418             else:
 419                 raise BaseException("unknown address")
 420             try:
 421                 seed = self.pw_decode( self.seed, password)
 422             except:
 423                 raise BaseException("Invalid password")
 424             if not seed: return None
 425             secexp = self.stretch_key(seed)
 426             secexp = ( secexp + self.get_sequence(n,for_change) ) % order
 427
 428         pk = number_to_string(secexp,order)
 429         return pk
 430
 431     def msg_magic(self, message):
 432         return "\x18Bitcoin Signed Message:\n" + chr( len(message) ) + message
 433
 434     def sign_message(self, address, message, password):
 435         private_key = ecdsa.SigningKey.from_string( self.get_private_key(address, password), curve = SECP256k1 )
 436         public_key = private_key.get_verifying_key()
 437         signature = private_key.sign_digest( Hash( self.msg_magic( message ) ), sigencode = ecdsa.util.sigencode_string )
 438         assert public_key.verify_digest( signature, Hash( self.msg_magic( message ) ), sigdecode = ecdsa.util.sigdecode_string)
 439         for i in range(4):
 440             sig = base64.b64encode( chr(27+i) + signature )
 441             try:
 442                 self.verify_message( address, sig, message)
 443                 return sig
 444             except:
 445                 continue
 446         else:
 447             raise BaseException("error: cannot sign message")
 448
 449
 450     def verify_message(self, address, signature, message):
 451         """ See http://www.secg.org/download/aid-780/sec1-v2.pdf for the math """
 452         from ecdsa import numbertheory, ellipticcurve, util
 453         import msqr
 454         curve = curve_secp256k1
 455         G = generator_secp256k1
 456         order = G.order()
 457         # extract r,s from signature
 458         sig = base64.b64decode(signature)
 459         if len(sig) != 65: raise BaseException("Wrong encoding")
 460         r,s = util.sigdecode_string(sig[1:], order)
 461         nV = ord(sig[0])
 462         if nV < 27 or nV >= 35:
 463             raise BaseException("Bad encoding")
 464         if nV >= 31:
 465             compressed = True
 466             nV -= 4
 467         else:
 468             compressed = False
 469
 470         recid = nV - 27
 471         # 1.1
 472         x = r + (recid/2) * order
 473         # 1.3
 474         alpha = ( x * x * x  + curve.a() * x + curve.b() ) % curve.p()
 475         beta = msqr.modular_sqrt(alpha, curve.p())
 476         y = beta if (beta - recid) % 2 == 0 else curve.p() - beta
 477         # 1.4 the constructor checks that nR is at infinity
 478         R = ellipticcurve.Point(curve, x, y, order)
 479         # 1.5 compute e from message:
 480         h = Hash( self.msg_magic( message ) )
 481         e = string_to_number(h)
 482         minus_e = -e % order
 483         # 1.6 compute Q = r^-1 (sR - eG)
 484         inv_r = numbertheory.inverse_mod(r,order)
 485         Q = inv_r * ( s * R + minus_e * G )
 486         public_key = ecdsa.VerifyingKey.from_public_point( Q, curve = SECP256k1 )
 487         # check that Q is the public key
 488         public_key.verify_digest( sig[1:], h, sigdecode = ecdsa.util.sigdecode_string)
 489         # check that we get the original signing address
 490         addr = public_key_to_bc_address( encode_point(public_key, compressed) )
 491         if address != addr:
 492             raise BaseException("Bad signature")
 493
 494
 495     def create_new_address(self, for_change):
 496         """   Publickey(type,n) = Master_public_key + H(n|S|type)*point  """
 497         curve = SECP256k1
 498         n = len(self.change_addresses) if for_change else len(self.addresses)
 499         z = self.get_sequence(n,for_change)
 500         master_public_key = ecdsa.VerifyingKey.from_string( self.master_public_key, curve = SECP256k1 )
 501         pubkey_point = master_public_key.pubkey.point + z*curve.generator
 502         public_key2 = ecdsa.VerifyingKey.from_public_point( pubkey_point, curve = SECP256k1 )
 503         address = public_key_to_bc_address( '04'.decode('hex') + public_key2.to_string() )
 504         if for_change:
 505             self.change_addresses.append(address)
 506         else:
 507             self.addresses.append(address)
 508
 509         self.history[address] = []
 510         print address
 511         return address
 512
 513
 514     def change_gap_limit(self, value):
 515         if value >= self.gap_limit:
 516             self.gap_limit = value
 517             self.save()
 518             self.interface.poke()
 519             return True
 520
 521         elif value >= self.min_acceptable_gap():
 522             k = self.num_unused_trailing_addresses()
 523             n = len(self.addresses) - k + value
 524             self.addresses = self.addresses[0:n]
 525             self.gap_limit = value
 526             self.save()
 527             return True
 528         else:
 529             return False
 530
 531     def num_unused_trailing_addresses(self):
 532         k = 0
 533         for a in self.addresses[::-1]:
 534             if self.history.get(a):break
 535             k = k + 1
 536         return k
 537
 538     def min_acceptable_gap(self):
 539         # fixme: this assumes wallet is synchronized
 540         n = 0
 541         nmax = 0
 542         k = self.num_unused_trailing_addresses()
 543         for a in self.addresses[0:-k]:
 544             if self.history.get(a):
 545                 n = 0
 546             else:
 547                 n += 1
 548                 if n > nmax: nmax = n
 549         return nmax + 1
 550
 551
 552     def synchronize(self):
 553         if not self.master_public_key:
 554             return []
 555
 556         new_addresses = []
 557         while True:
 558             if self.change_addresses == []:
 559                 new_addresses.append( self.create_new_address(True) )
 560                 continue
 561             a = self.change_addresses[-1]
 562             if self.history.get(a):
 563                 new_addresses.append( self.create_new_address(True) )
 564             else:
 565                 break
 566
 567         n = self.gap_limit
 568         while True:
 569             if len(self.addresses) < n:
 570                 new_addresses.append( self.create_new_address(False) )
 571                 continue
 572             if map( lambda a: self.history.get(a), self.addresses[-n:] ) == n*[[]]:
 573                 break
 574             else:
 575                 new_addresses.append( self.create_new_address(False) )
 576
 577         if self.remote_url:
 578             num = self.get_remote_number()
 579             while len(self.addresses)<num:
 580                 new_addresses.append( self.create_new_address(False) )
 581
 582         return new_addresses
 583
 584
 585     def get_remote_number(self):
 586         import jsonrpclib
 587         server = jsonrpclib.Server(self.remote_url)
 588         out = server.getnum()
 589         return out
 590
 591     def get_remote_mpk(self):
 592         import jsonrpclib
 593         server = jsonrpclib.Server(self.remote_url)
 594         out = server.getkey()
 595         return out
 596
 597     def is_found(self):
 598         return (len(self.change_addresses) > 1 ) or ( len(self.addresses) > self.gap_limit )
 599
 600     def fill_addressbook(self):
 601         for tx in self.tx_history.values():
 602             if tx['value']<0:
 603                 for i in tx['outputs']:
 604                     if not self.is_mine(i) and i not in self.addressbook:
 605                         self.addressbook.append(i)
 606         # redo labels
 607         self.update_tx_labels()
 608
 609
 610     def save(self):
 611         s = {
 612             'seed_version':self.seed_version,
 613             'use_encryption':self.use_encryption,
 614             'master_public_key': self.master_public_key.encode('hex'),
 615             'fee':self.fee,
 616             'server':self.server,
 617             'seed':self.seed,
 618             'addresses':self.addresses,
 619             'change_addresses':self.change_addresses,
 620             'history':self.history,
 621             'labels':self.labels,
 622             'contacts':self.addressbook,
 623             'imported_keys':self.imported_keys,
 624             'aliases':self.aliases,
 625             'authorities':self.authorities,
 626             'receipts':self.receipts,
 627             'num_zeros':self.num_zeros,
 628             'frozen_addresses':self.frozen_addresses,
 629             'prioritized_addresses':self.prioritized_addresses,
 630             'expert_mode':self.expert_mode,
 631             'gap_limit':self.gap_limit,
 632             }
 633         f = open(self.path,"w")
 634         f.write( repr(s) )
 635         f.close()
 636         import stat
 637         os.chmod(self.path,stat.S_IREAD | stat.S_IWRITE)
 638
 639     def read(self):
 640         import interface
 641
 642         upgrade_msg = """This wallet seed is deprecated. Please run upgrade.py for a diagnostic."""
 643         self.file_exists = False
 644         try:
 645             f = open(self.path,"r")
 646             data = f.read()
 647             f.close()
 648         except:
 649             return
 650         data = interface.old_to_new(data)
 651         try:
 652             d = ast.literal_eval( data )
 653             self.seed_version = d.get('seed_version')
 654             self.master_public_key = d.get('master_public_key').decode('hex')
 655             self.use_encryption = d.get('use_encryption')
 656             self.fee = int( d.get('fee') )
 657             self.seed = d.get('seed')
 658             self.server = d.get('server')
 659             #blocks = d.get('blocks')
 660             self.addresses = d.get('addresses')
 661             self.change_addresses = d.get('change_addresses')
 662             self.history = d.get('history')
 663             self.labels = d.get('labels')
 664             self.addressbook = d.get('contacts')
 665             self.imported_keys = d.get('imported_keys',{})
 666             self.aliases = d.get('aliases',{})
 667             self.authorities = d.get('authorities',{})
 668             self.receipts = d.get('receipts',{})
 669             self.num_zeros = d.get('num_zeros',0)
 670             self.frozen_addresses = d.get('frozen_addresses',[])
 671             self.prioritized_addresses = d.get('prioritized_addresses',[])
 672             self.expert_mode = d.get('expert_mode',False)
 673             self.gap_limit = d.get('gap_limit',5)
 674         except:
 675             raise BaseException("cannot read wallet file")
 676
 677         self.update_tx_history()
 678
 679         if self.seed_version != SEED_VERSION:
 680             raise BaseException(upgrade_msg)
 681
 682         if self.remote_url: assert self.master_public_key.encode('hex') == self.get_remote_mpk()
 683
 684         self.file_exists = True
 685
 686
 687     def get_address_flags(self, addr):
 688         flags = "C" if self.is_change(addr) else "I" if addr in self.imported_keys.keys() else "-"
 689         flags += "F" if addr in self.frozen_addresses else "P" if addr in self.prioritized_addresses else "-"
 690         return flags
 691
 692
 693     def get_addr_balance(self, addr):
 694         assert self.is_mine(addr)
 695         h = self.history.get(addr,[])
 696         c = u = 0
 697         for item in h:
 698             v = item['value']
 699             if item['height']:
 700                 c += v
 701             else:
 702                 u += v
 703         return c, u
 704
 705     def get_balance(self):
 706         conf = unconf = 0
 707         for addr in self.all_addresses():
 708             c, u = self.get_addr_balance(addr)
 709             conf += c
 710             unconf += u
 711         return conf, unconf
 712
 713
 714     def choose_tx_inputs( self, amount, fixed_fee, from_addr = None ):
 715         """ todo: minimize tx size """
 716         total = 0
 717         fee = self.fee if fixed_fee is None else fixed_fee
 718
 719         coins = []
 720         prioritized_coins = []
 721         domain = [from_addr] if from_addr else self.all_addresses()
 722         for i in self.frozen_addresses:
 723             if i in domain: domain.remove(i)
 724
 725         for i in self.prioritized_addresses:
 726             if i in domain: domain.remove(i)
 727
 728         for addr in domain:
 729             h = self.history.get(addr)
 730             if h is None: continue
 731             for item in h:
 732                 if item.get('raw_output_script'):
 733                     coins.append( (addr,item))
 734
 735         coins = sorted( coins, key = lambda x: x[1]['timestamp'] )
 736
 737         for addr in self.prioritized_addresses:
 738             h = self.history.get(addr)
 739             if h is None: continue
 740             for item in h:
 741                 if item.get('raw_output_script'):
 742                     prioritized_coins.append( (addr,item))
 743
 744         prioritized_coins = sorted( prioritized_coins, key = lambda x: x[1]['timestamp'] )
 745
 746         inputs = []
 747         coins = prioritized_coins + coins
 748
 749         for c in coins:
 750             addr, item = c
 751             v = item.get('value')
 752             total += v
 753             inputs.append((addr, v, item['tx_hash'], item['index'], item['raw_output_script'], None, None) )
 754             fee = self.fee*len(inputs) if fixed_fee is None else fixed_fee
 755             if total >= amount + fee: break
 756         else:
 757             #print "not enough funds: %s %s"%(format_satoshis(total), format_satoshis(fee))
 758             inputs = []
 759         return inputs, total, fee
 760
 761     def choose_tx_outputs( self, to_addr, amount, fee, total, change_addr=None ):
 762         outputs = [ (to_addr, amount) ]
 763         change_amount = total - ( amount + fee )
 764         if change_amount != 0:
 765             # normally, the update thread should ensure that the last change address is unused
 766             if not change_addr:
 767                 change_addr = self.change_addresses[-1]
 768             outputs.append( ( change_addr,  change_amount) )
 769         return outputs
 770
 771     def sign_inputs( self, inputs, outputs, password ):
 772         s_inputs = []
 773         for i in range(len(inputs)):
 774             addr, v, p_hash, p_pos, p_scriptPubKey, _, _ = inputs[i]
 775             private_key = ecdsa.SigningKey.from_string( self.get_private_key(addr, password), curve = SECP256k1 )
 776             public_key = private_key.get_verifying_key()
 777             pubkey = public_key.to_string()
 778             tx = filter( raw_tx( inputs, outputs, for_sig = i ) )
 779             sig = private_key.sign_digest( Hash( tx.decode('hex') ), sigencode = ecdsa.util.sigencode_der )
 780             assert public_key.verify_digest( sig, Hash( tx.decode('hex') ), sigdecode = ecdsa.util.sigdecode_der)
 781             s_inputs.append( (addr, v, p_hash, p_pos, p_scriptPubKey, pubkey, sig) )
 782         return s_inputs
 783
 784     def pw_encode(self, s, password):
 785         if password:
 786             secret = Hash(password)
 787             return EncodeAES(secret, s)
 788         else:
 789             return s
 790
 791     def pw_decode(self, s, password):
 792         if password is not None:
 793             secret = Hash(password)
 794             d = DecodeAES(secret, s)
 795             if s == self.seed:
 796                 try:
 797                     d.decode('hex')
 798                 except:
 799                     raise BaseException("Invalid password")
 800             return d
 801         else:
 802             return s
 803
 804     def get_status(self, address):
 805         h = self.history.get(address)
 806         if not h:
 807             status = None
 808         else:
 809             lastpoint = h[-1]
 810             status = lastpoint['block_hash']
 811             if status == 'mempool':
 812                 status = status + ':%d'% len(h)
 813         return status
 814
 815     def receive_status_callback(self, addr, status):
 816         with self.lock:
 817             if self.get_status(addr) != status:
 818                 #print "updating status for", addr, status
 819                 self.interface.get_history(addr)
 820
 821     def receive_history_callback(self, addr, data):
 822         #print "updating history for", addr
 823         with self.lock:
 824             self.history[addr] = data
 825             self.update_tx_history()
 826             self.save()
 827
 828     def get_tx_history(self):
 829         lines = self.tx_history.values()
 830         lines = sorted(lines, key=operator.itemgetter("timestamp"))
 831         return lines
 832
 833     def update_tx_history(self):
 834         self.tx_history= {}
 835         for addr in self.all_addresses():
 836             h = self.history.get(addr)
 837             if h is None: continue
 838             for tx in h:
 839                 tx_hash = tx['tx_hash']
 840                 line = self.tx_history.get(tx_hash)
 841                 if not line:
 842                     self.tx_history[tx_hash] = copy.copy(tx)
 843                     line = self.tx_history.get(tx_hash)
 844                 else:
 845                     line['value'] += tx['value']
 846                 if line['height'] == 0:
 847                     line['timestamp'] = 1e12
 848         self.update_tx_labels()
 849
 850     def update_tx_labels(self):
 851         for tx in self.tx_history.values():
 852             default_label = ''
 853             if tx['value']<0:
 854                 for o_addr in tx['outputs']:
 855                     if not self.is_mine(o_addr):
 856                         dest_label = self.labels.get(o_addr)
 857                         if dest_label:
 858                             default_label = 'to: ' + dest_label
 859                         else:
 860                             default_label = 'to: ' + o_addr
 861             else:
 862                 for o_addr in tx['outputs']:
 863                     if self.is_mine(o_addr) and not self.is_change(o_addr):
 864                         break
 865                 else:
 866                     for o_addr in tx['outputs']:
 867                         if self.is_mine(o_addr):
 868                             break
 869                     else:
 870                         o_addr = None
 871
 872                 if o_addr:
 873                     dest_label = self.labels.get(o_addr)
 874                     if dest_label:
 875                         default_label = 'at: ' + dest_label
 876                     else:
 877                         default_label = 'at: ' + o_addr
 878
 879             tx['default_label'] = default_label
 880
 881     def mktx(self, to_address, amount, label, password, fee=None, change_addr=None, from_addr= None):
 882         if not self.is_valid(to_address):
 883             raise BaseException("Invalid address")
 884         inputs, total, fee = self.choose_tx_inputs( amount, fee, from_addr )
 885         if not inputs:
 886             raise BaseException("Not enough funds")
 887         outputs = self.choose_tx_outputs( to_address, amount, fee, total, change_addr )
 888         s_inputs = self.sign_inputs( inputs, outputs, password )
 889
 890         tx = filter( raw_tx( s_inputs, outputs ) )
 891         if to_address not in self.addressbook:
 892             self.addressbook.append(to_address)
 893         if label:
 894             tx_hash = Hash(tx.decode('hex') )[::-1].encode('hex')
 895             self.labels[tx_hash] = label
 896
 897         return tx
 898
 899     def sendtx(self, tx):
 900         tx_hash = Hash(tx.decode('hex') )[::-1].encode('hex')
 901         self.tx_event.clear()
 902         self.interface.send([('blockchain.transaction.broadcast', [tx])])
 903         self.tx_event.wait()
 904         out = self.tx_result
 905         if out != tx_hash:
 906             return False, "error: " + out
 907         if self.receipt:
 908             self.receipts[tx_hash] = self.receipt
 909             self.receipt = None
 910         return True, out
 911
 912
 913     def read_alias(self, alias):
 914         # this might not be the right place for this function.
 915         import urllib
 916
 917         m1 = re.match('([\w\-\.]+)@((\w[\w\-]+\.)+[\w\-]+)', alias)
 918         m2 = re.match('((\w[\w\-]+\.)+[\w\-]+)', alias)
 919         if m1:
 920             url = 'http://' + m1.group(2) + '/bitcoin.id/' + m1.group(1)
 921         elif m2:
 922             url = 'http://' + alias + '/bitcoin.id'
 923         else:
 924             return ''
 925         try:
 926             lines = urllib.urlopen(url).readlines()
 927         except:
 928             return ''
 929
 930         # line 0
 931         line = lines[0].strip().split(':')
 932         if len(line) == 1:
 933             auth_name = None
 934             target = signing_addr = line[0]
 935         else:
 936             target, auth_name, signing_addr, signature = line
 937             msg = "alias:%s:%s:%s"%(alias,target,auth_name)
 938             print msg, signature
 939             self.verify_message(signing_addr, signature, msg)
 940
 941         # other lines are signed updates
 942         for line in lines[1:]:
 943             line = line.strip()
 944             if not line: continue
 945             line = line.split(':')
 946             previous = target
 947             print repr(line)
 948             target, signature = line
 949             self.verify_message(previous, signature, "alias:%s:%s"%(alias,target))
 950
 951         if not self.is_valid(target):
 952             raise BaseException("Invalid bitcoin address")
 953
 954         return target, signing_addr, auth_name
 955
 956     def update_password(self, seed, old_password, new_password):
 957         if new_password == '': new_password = None
 958         self.use_encryption = (new_password != None)
 959         self.seed = self.pw_encode( seed, new_password)
 960         for k in self.imported_keys.keys():
 961             a = self.imported_keys[k]
 962             b = self.pw_decode(a, old_password)
 963             c = self.pw_encode(b, new_password)
 964             self.imported_keys[k] = c
 965         self.save()
 966
 967     def get_alias(self, alias, interactive = False, show_message=None, question = None):
 968         try:
 969             target, signing_address, auth_name = self.read_alias(alias)
 970         except BaseException, e:
 971             # raise exception if verify fails (verify the chain)
 972             if interactive:
 973                 show_message("Alias error: " + str(e))
 974             return
 975
 976         print target, signing_address, auth_name
 977
 978         if auth_name is None:
 979             a = self.aliases.get(alias)
 980             if not a:
 981                 msg = "Warning: the alias '%s' is self-signed.\nThe signing address is %s.\n\nDo you want to add this alias to your list of contacts?"%(alias,signing_address)
 982                 if interactive and question( msg ):
 983                     self.aliases[alias] = (signing_address, target)
 984                 else:
 985                     target = None
 986             else:
 987                 if signing_address != a[0]:
 988                     msg = "Warning: the key of alias '%s' has changed since your last visit! It is possible that someone is trying to do something nasty!!!\nDo you accept to change your trusted key?"%alias
 989                     if interactive and question( msg ):
 990                         self.aliases[alias] = (signing_address, target)
 991                     else:
 992                         target = None
 993         else:
 994             if signing_address not in self.authorities.keys():
 995                 msg = "The alias: '%s' links to %s\n\nWarning: this alias was signed by an unknown key.\nSigning authority: %s\nSigning address: %s\n\nDo you want to add this key to your list of trusted keys?"%(alias,target,auth_name,signing_address)
 996                 if interactive and question( msg ):
 997                     self.authorities[signing_address] = auth_name
 998                 else:
 999                     target = None
1000
1001         if target:
1002             self.aliases[alias] = (signing_address, target)
1003
1004         return target
1005
1006
1007     def parse_url(self, url, show_message, question):
1008         o = url[8:].split('?')
1009         address = o[0]
1010         if len(o)>1:
1011             params = o[1].split('&')
1012         else:
1013             params = []
1014
1015         amount = label = message = signature = identity = ''
1016         for p in params:
1017             k,v = p.split('=')
1018             uv = urldecode(v)
1019             if k == 'amount': amount = uv
1020             elif k == 'message': message = uv
1021             elif k == 'label': label = uv
1022             elif k == 'signature':
1023                 identity, signature = uv.split(':')
1024                 url = url.replace('&%s=%s'%(k,v),'')
1025             else:
1026                 print k,v
1027
1028         if label and self.labels.get(address) != label:
1029             if question('Give label "%s" to address %s ?'%(label,address)):
1030                 if address not in self.addressbook and address not in self.all_addresses():
1031                     self.addressbook.append(address)
1032                 self.labels[address] = label
1033
1034         if signature:
1035             if re.match('^(|([\w\-\.]+)@)((\w[\w\-]+\.)+[\w\-]+)$', identity):
1036                 signing_address = self.get_alias(identity, True, show_message, question)
1037             elif self.is_valid(identity):
1038                 signing_address = identity
1039             else:
1040                 signing_address = None
1041             if not signing_address:
1042                 return
1043             try:
1044                 self.verify_message(signing_address, signature, url )
1045                 self.receipt = (signing_address, signature, url)
1046             except:
1047                 show_message('Warning: the URI contains a bad signature.\nThe identity of the recipient cannot be verified.')
1048                 address = amount = label = identity = message = ''
1049
1050         if re.match('^(|([\w\-\.]+)@)((\w[\w\-]+\.)+[\w\-]+)$', address):
1051             payto_address = self.get_alias(address, True, show_message, question)
1052             if payto_address:
1053                 address = address + ' <' + payto_address + '>'
1054
1055         return address, amount, label, message, signature, identity, url
1056
1057
1058     def update(self):
1059         self.interface.poke()
1060         self.up_to_date_event.wait(10000000000)
1061
1062
1063     def start_session(self, interface):
1064         self.interface = interface
1065         self.interface.send([('server.banner',[]), ('blockchain.numblocks.subscribe',[]), ('server.peers.subscribe',[])])
1066         self.interface.subscribe(self.all_addresses())
1067
1068
1069     def freeze(self,addr):
1070         if addr in self.all_addresses() and addr not in self.frozen_addresses:
1071             self.unprioritize(addr)
1072             self.frozen_addresses.append(addr)
1073             self.save()
1074             return True
1075         else:
1076             return False
1077
1078     def unfreeze(self,addr):
1079         if addr in self.all_addresses() and addr in self.frozen_addresses:
1080             self.frozen_addresses.remove(addr)
1081             self.save()
1082             return True
1083         else:
1084             return False
1085
1086     def prioritize(self,addr):
1087         if addr in self.all_addresses() and addr not in self.prioritized_addresses:
1088             self.unfreeze(addr)
1089             self.prioritized_addresses.append(addr)
1090             self.save()
1091             return True
1092         else:
1093             return False
1094
1095     def unprioritize(self,addr):
1096         if addr in self.all_addresses() and addr in self.prioritized_addresses:
1097             self.prioritized_addresses.remove(addr)
1098             self.save()
1099             return True
1100         else:
1101             return False