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