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, getpass
  21 import aes, ecdsa
  22 from ecdsa.util import string_to_number, number_to_string
  23 from util import print_error
  24
  25 ############ functions from pywallet #####################
  26
  27 addrtype = 0
  28
  29 def hash_160(public_key):
  30     try:
  31         md = hashlib.new('ripemd160')
  32         md.update(hashlib.sha256(public_key).digest())
  33         return md.digest()
  34     except:
  35         import ripemd
  36         md = ripemd.new(hashlib.sha256(public_key).digest())
  37         return md.digest()
  38
  39
  40 def public_key_to_bc_address(public_key):
  41     h160 = hash_160(public_key)
  42     return hash_160_to_bc_address(h160)
  43
  44 def hash_160_to_bc_address(h160):
  45     vh160 = chr(addrtype) + h160
  46     h = Hash(vh160)
  47     addr = vh160 + h[0:4]
  48     return b58encode(addr)
  49
  50 def bc_address_to_hash_160(addr):
  51     bytes = b58decode(addr, 25)
  52     return bytes[1:21]
  53
  54 def encode_point(pubkey, compressed=False):
  55     order = generator_secp256k1.order()
  56     p = pubkey.pubkey.point
  57     x_str = ecdsa.util.number_to_string(p.x(), order)
  58     y_str = ecdsa.util.number_to_string(p.y(), order)
  59     if compressed:
  60         return chr(2 + (p.y() & 1)) + x_str
  61     else:
  62         return chr(4) + pubkey.to_string() #x_str + y_str
  63
  64 __b58chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
  65 __b58base = len(__b58chars)
  66
  67 def b58encode(v):
  68     """ encode v, which is a string of bytes, to base58.
  69     """
  70
  71     long_value = 0L
  72     for (i, c) in enumerate(v[::-1]):
  73         long_value += (256**i) * ord(c)
  74
  75     result = ''
  76     while long_value >= __b58base:
  77         div, mod = divmod(long_value, __b58base)
  78         result = __b58chars[mod] + result
  79         long_value = div
  80     result = __b58chars[long_value] + result
  81
  82     # Bitcoin does a little leading-zero-compression:
  83     # leading 0-bytes in the input become leading-1s
  84     nPad = 0
  85     for c in v:
  86         if c == '\0': nPad += 1
  87         else: break
  88
  89     return (__b58chars[0]*nPad) + result
  90
  91 def b58decode(v, length):
  92     """ decode v into a string of len bytes
  93     """
  94     long_value = 0L
  95     for (i, c) in enumerate(v[::-1]):
  96         long_value += __b58chars.find(c) * (__b58base**i)
  97
  98     result = ''
  99     while long_value >= 256:
 100         div, mod = divmod(long_value, 256)
 101         result = chr(mod) + result
 102         long_value = div
 103     result = chr(long_value) + result
 104
 105     nPad = 0
 106     for c in v:
 107         if c == __b58chars[0]: nPad += 1
 108         else: break
 109
 110     result = chr(0)*nPad + result
 111     if length is not None and len(result) != length:
 112         return None
 113
 114     return result
 115
 116
 117 def Hash(data):
 118     return hashlib.sha256(hashlib.sha256(data).digest()).digest()
 119
 120 def EncodeBase58Check(vchIn):
 121     hash = Hash(vchIn)
 122     return b58encode(vchIn + hash[0:4])
 123
 124 def DecodeBase58Check(psz):
 125     vchRet = b58decode(psz, None)
 126     key = vchRet[0:-4]
 127     csum = vchRet[-4:]
 128     hash = Hash(key)
 129     cs32 = hash[0:4]
 130     if cs32 != csum:
 131         return None
 132     else:
 133         return key
 134
 135 def PrivKeyToSecret(privkey):
 136     return privkey[9:9+32]
 137
 138 def SecretToASecret(secret):
 139     vchIn = chr(addrtype+128) + secret
 140     return EncodeBase58Check(vchIn)
 141
 142 def ASecretToSecret(key):
 143     vch = DecodeBase58Check(key)
 144     if vch and vch[0] == chr(addrtype+128):
 145         return vch[1:]
 146     else:
 147         return False
 148
 149 ########### end pywallet functions #######################
 150
 151 # get password routine
 152 def prompt_password(prompt, confirm=True):
 153     if sys.stdin.isatty():
 154         password = getpass.getpass(prompt)
 155
 156         if password and confirm:
 157             password2 = getpass.getpass("Confirm: ")
 158
 159             if password != password2:
 160                 print_error("Error: Passwords do not match.")
 161                 sys.exit(1)
 162
 163     else:
 164         password = raw_input(prompt)
 165
 166     if not password:
 167         password = None
 168
 169     return password
 170
 171 # URL decode
 172 _ud = re.compile('%([0-9a-hA-H]{2})', re.MULTILINE)
 173 urldecode = lambda x: _ud.sub(lambda m: chr(int(m.group(1), 16)), x)
 174
 175
 176 def int_to_hex(i, length=1):
 177     s = hex(i)[2:].rstrip('L')
 178     s = "0"*(2*length - len(s)) + s
 179     return s.decode('hex')[::-1].encode('hex')
 180
 181
 182 # AES
 183 EncodeAES = lambda secret, s: base64.b64encode(aes.encryptData(secret,s))
 184 DecodeAES = lambda secret, e: aes.decryptData(secret, base64.b64decode(e))
 185
 186
 187
 188 # secp256k1, http://www.oid-info.com/get/1.3.132.0.10
 189 _p = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2FL
 190 _r = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141L
 191 _b = 0x0000000000000000000000000000000000000000000000000000000000000007L
 192 _a = 0x0000000000000000000000000000000000000000000000000000000000000000L
 193 _Gx = 0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798L
 194 _Gy = 0x483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8L
 195 curve_secp256k1 = ecdsa.ellipticcurve.CurveFp( _p, _a, _b )
 196 generator_secp256k1 = ecdsa.ellipticcurve.Point( curve_secp256k1, _Gx, _Gy, _r )
 197 oid_secp256k1 = (1,3,132,0,10)
 198 SECP256k1 = ecdsa.curves.Curve("SECP256k1", curve_secp256k1, generator_secp256k1, oid_secp256k1 )
 199
 200
 201 def filter(s):
 202     out = re.sub('( [^\n]*|)\n','',s)
 203     out = out.replace(' ','')
 204     out = out.replace('\n','')
 205     return out
 206
 207 def raw_tx( inputs, outputs, for_sig = None ):
 208     s  = int_to_hex(1,4)                                     +   '     version\n'
 209     s += int_to_hex( len(inputs) )                           +   '     number of inputs\n'
 210     for i in range(len(inputs)):
 211         _, _, p_hash, p_index, p_script, pubkey, sig = inputs[i]
 212         s += p_hash.decode('hex')[::-1].encode('hex')        +  '     prev hash\n'
 213         s += int_to_hex(p_index,4)                           +  '     prev index\n'
 214         if for_sig is None:
 215             sig = sig + chr(1)                               # hashtype
 216             script  = int_to_hex( len(sig))                  +  '     push %d bytes\n'%len(sig)
 217             script += sig.encode('hex')                      +  '     sig\n'
 218             pubkey = chr(4) + pubkey
 219             script += int_to_hex( len(pubkey))               +  '     push %d bytes\n'%len(pubkey)
 220             script += pubkey.encode('hex')                   +  '     pubkey\n'
 221         elif for_sig==i:
 222             script = p_script                                +  '     scriptsig \n'
 223         else:
 224             script=''
 225         s += int_to_hex( len(filter(script))/2 )             +  '     script length \n'
 226         s += script
 227         s += "ffffffff"                                      +  '     sequence\n'
 228     s += int_to_hex( len(outputs) )                          +  '     number of outputs\n'
 229     for output in outputs:
 230         addr, amount = output
 231         s += int_to_hex( amount, 8)                          +  '     amount: %d\n'%amount
 232         script = '76a9'                                      # op_dup, op_hash_160
 233         script += '14'                                       # push 0x14 bytes
 234         script += bc_address_to_hash_160(addr).encode('hex')
 235         script += '88ac'                                     # op_equalverify, op_checksig
 236         s += int_to_hex( len(filter(script))/2 )             +  '     script length \n'
 237         s += script                                          +  '     script \n'
 238     s += int_to_hex(0,4)                                     # lock time
 239     if for_sig is not None: s += int_to_hex(1, 4)            # hash type
 240     return s
 241
 242
 243
 244
 245 def format_satoshis(x, is_diff=False, num_zeros = 0):
 246     from decimal import Decimal
 247     s = Decimal(x)
 248     sign, digits, exp = s.as_tuple()
 249     digits = map(str, digits)
 250     while len(digits) < 9:
 251         digits.insert(0,'0')
 252     digits.insert(-8,'.')
 253     s = ''.join(digits).rstrip('0')
 254     if sign:
 255         s = '-' + s
 256     elif is_diff:
 257         s = "+" + s
 258
 259     p = s.find('.')
 260     s += "0"*( 1 + num_zeros - ( len(s) - p ))
 261     s += " "*( 9 - ( len(s) - p ))
 262     s = " "*( 5 - ( p )) + s
 263     return s
 264
 265
 266 from version import ELECTRUM_VERSION, SEED_VERSION
 267 from interface import DEFAULT_SERVERS
 268
 269
 270
 271
 272 class Wallet:
 273     def __init__(self):
 274
 275         self.electrum_version = ELECTRUM_VERSION
 276         self.seed_version = SEED_VERSION
 277         self.update_callbacks = []
 278
 279         self.gap_limit = 5           # configuration
 280         self.use_change = True
 281         self.fee = 100000
 282         self.num_zeros = 0
 283         self.master_public_key = ''
 284         self.conversion_currency = None
 285
 286         # saved fields
 287         self.use_encryption = False
 288         self.addresses = []          # receiving addresses visible for user
 289         self.change_addresses = []   # addresses used as change
 290         self.seed = ''               # encrypted
 291         self.history = {}
 292         self.labels = {}             # labels for addresses and transactions
 293         self.aliases = {}            # aliases for addresses
 294         self.authorities = {}        # trusted addresses
 295         self.frozen_addresses = []
 296         self.prioritized_addresses = []
 297         self.expert_mode = False
 298
 299         self.receipts = {}           # signed URIs
 300         self.receipt = None          # next receipt
 301         self.addressbook = []        # outgoing addresses, for payments
 302         self.debug_server = False    # write server communication debug info to stdout
 303
 304         # not saved
 305         self.tx_history = {}
 306
 307         self.imported_keys = {}
 308         self.remote_url = None
 309
 310         self.was_updated = True
 311         self.blocks = -1
 312         self.banner = ''
 313
 314         # there is a difference between self.up_to_date and self.is_up_to_date()
 315         # self.is_up_to_date() returns true when all requests have been answered and processed
 316         # self.up_to_date is true when the wallet is synchronized (stronger requirement)
 317         self.up_to_date_event = threading.Event()
 318         self.up_to_date_event.clear()
 319         self.up_to_date = False
 320         self.lock = threading.Lock()
 321         self.tx_event = threading.Event()
 322
 323         self.pick_random_server()
 324
 325     def register_callback(self, update_callback):
 326         with self.lock:
 327             self.update_callbacks.append(update_callback)
 328
 329     def trigger_callbacks(self):
 330         with self.lock:
 331             callbacks = self.update_callbacks[:]
 332         [update() for update in callbacks]
 333
 334     def pick_random_server(self):
 335         self.server = random.choice( DEFAULT_SERVERS )         # random choice when the wallet is created
 336
 337     def is_up_to_date(self):
 338         return self.interface.responses.empty() and not self.interface.unanswered_requests
 339
 340     def set_server(self, server):
 341         # raise an error if the format isnt correct
 342         a,b,c = server.split(':')
 343         b = int(b)
 344         assert c in ['t','h','n']
 345         # set the server
 346         if server != self.server:
 347             self.server = server
 348             self.save()
 349             self.interface.is_connected = False  # this exits the polling loop
 350             self.interface.poke()
 351
 352     def set_path(self, wallet_path):
 353
 354         if wallet_path is not None:
 355             self.path = wallet_path
 356         else:
 357             # backward compatibility: look for wallet file in the default data directory
 358             if "HOME" in os.environ:
 359                 wallet_dir = os.path.join( os.environ["HOME"], '.electrum')
 360             elif "LOCALAPPDATA" in os.environ:
 361                 wallet_dir = os.path.join( os.environ["LOCALAPPDATA"], 'Electrum' )
 362             elif "APPDATA" in os.environ:
 363                 wallet_dir = os.path.join( os.environ["APPDATA"], 'Electrum' )
 364             else:
 365                 raise BaseException("No home directory found in environment variables.")
 366
 367             if not os.path.exists( wallet_dir ): os.mkdir( wallet_dir )
 368             self.path = os.path.join( wallet_dir, 'electrum.dat' )
 369
 370     def import_key(self, keypair, password):
 371         address, key = keypair.split(':')
 372         if not self.is_valid(address):
 373             raise BaseException('Invalid Bitcoin address')
 374         if address in self.all_addresses():
 375             raise BaseException('Address already in wallet')
 376         b = ASecretToSecret( key )
 377         if not b:
 378             raise BaseException('Unsupported key format')
 379         secexp = int( b.encode('hex'), 16)
 380         private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve=SECP256k1 )
 381         # sanity check
 382         public_key = private_key.get_verifying_key()
 383         if not address == public_key_to_bc_address( '04'.decode('hex') + public_key.to_string() ):
 384             raise BaseException('Address does not match private key')
 385         self.imported_keys[address] = self.pw_encode( key, password )
 386
 387     def new_seed(self, password):
 388         seed = "%032x"%ecdsa.util.randrange( pow(2,128) )
 389         #self.init_mpk(seed)
 390         # encrypt
 391         self.seed = self.pw_encode( seed, password )
 392
 393
 394     def init_mpk(self,seed):
 395         # public key
 396         curve = SECP256k1
 397         secexp = self.stretch_key(seed)
 398         master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 399         self.master_public_key = master_private_key.get_verifying_key().to_string()
 400
 401     def all_addresses(self):
 402         return self.addresses + self.change_addresses + self.imported_keys.keys()
 403
 404     def is_mine(self, address):
 405         return address in self.all_addresses()
 406
 407     def is_change(self, address):
 408         return address in self.change_addresses
 409
 410     def is_valid(self,addr):
 411         ADDRESS_RE = re.compile('[1-9A-HJ-NP-Za-km-z]{26,}\\Z')
 412         if not ADDRESS_RE.match(addr): return False
 413         try:
 414             h = bc_address_to_hash_160(addr)
 415         except:
 416             return False
 417         return addr == hash_160_to_bc_address(h)
 418
 419     def stretch_key(self,seed):
 420         oldseed = seed
 421         for i in range(100000):
 422             seed = hashlib.sha256(seed + oldseed).digest()
 423         return string_to_number( seed )
 424
 425     def get_sequence(self,n,for_change):
 426         return string_to_number( Hash( "%d:%d:"%(n,for_change) + self.master_public_key ) )
 427
 428     def get_private_key_base58(self, address, password):
 429         pk = self.get_private_key(address, password)
 430         if pk is None: return None
 431         return SecretToASecret( pk )
 432
 433     def get_private_key(self, address, password):
 434         """  Privatekey(type,n) = Master_private_key + H(n|S|type)  """
 435         order = generator_secp256k1.order()
 436
 437         if address in self.imported_keys.keys():
 438             b = self.pw_decode( self.imported_keys[address], password )
 439             if not b: return None
 440             b = ASecretToSecret( b )
 441             secexp = int( b.encode('hex'), 16)
 442         else:
 443             if address in self.addresses:
 444                 n = self.addresses.index(address)
 445                 for_change = False
 446             elif address in self.change_addresses:
 447                 n = self.change_addresses.index(address)
 448                 for_change = True
 449             else:
 450                 raise BaseException("unknown address")
 451             try:
 452                 seed = self.pw_decode( self.seed, password)
 453             except:
 454                 raise BaseException("Invalid password")
 455             if not seed: return None
 456             secexp = self.stretch_key(seed)
 457             secexp = ( secexp + self.get_sequence(n,for_change) ) % order
 458
 459         pk = number_to_string(secexp,order)
 460         return pk
 461
 462     def msg_magic(self, message):
 463         return "\x18Bitcoin Signed Message:\n" + chr( len(message) ) + message
 464
 465     def sign_message(self, address, message, password):
 466         private_key = ecdsa.SigningKey.from_string( self.get_private_key(address, password), curve = SECP256k1 )
 467         public_key = private_key.get_verifying_key()
 468         signature = private_key.sign_digest( Hash( self.msg_magic( message ) ), sigencode = ecdsa.util.sigencode_string )
 469         assert public_key.verify_digest( signature, Hash( self.msg_magic( message ) ), sigdecode = ecdsa.util.sigdecode_string)
 470         for i in range(4):
 471             sig = base64.b64encode( chr(27+i) + signature )
 472             try:
 473                 self.verify_message( address, sig, message)
 474                 return sig
 475             except:
 476                 continue
 477         else:
 478             raise BaseException("error: cannot sign message")
 479
 480
 481     def verify_message(self, address, signature, message):
 482         """ See http://www.secg.org/download/aid-780/sec1-v2.pdf for the math """
 483         from ecdsa import numbertheory, ellipticcurve, util
 484         import msqr
 485         curve = curve_secp256k1
 486         G = generator_secp256k1
 487         order = G.order()
 488         # extract r,s from signature
 489         sig = base64.b64decode(signature)
 490         if len(sig) != 65: raise BaseException("Wrong encoding")
 491         r,s = util.sigdecode_string(sig[1:], order)
 492         nV = ord(sig[0])
 493         if nV < 27 or nV >= 35:
 494             raise BaseException("Bad encoding")
 495         if nV >= 31:
 496             compressed = True
 497             nV -= 4
 498         else:
 499             compressed = False
 500
 501         recid = nV - 27
 502         # 1.1
 503         x = r + (recid/2) * order
 504         # 1.3
 505         alpha = ( x * x * x  + curve.a() * x + curve.b() ) % curve.p()
 506         beta = msqr.modular_sqrt(alpha, curve.p())
 507         y = beta if (beta - recid) % 2 == 0 else curve.p() - beta
 508         # 1.4 the constructor checks that nR is at infinity
 509         R = ellipticcurve.Point(curve, x, y, order)
 510         # 1.5 compute e from message:
 511         h = Hash( self.msg_magic( message ) )
 512         e = string_to_number(h)
 513         minus_e = -e % order
 514         # 1.6 compute Q = r^-1 (sR - eG)
 515         inv_r = numbertheory.inverse_mod(r,order)
 516         Q = inv_r * ( s * R + minus_e * G )
 517         public_key = ecdsa.VerifyingKey.from_public_point( Q, curve = SECP256k1 )
 518         # check that Q is the public key
 519         public_key.verify_digest( sig[1:], h, sigdecode = ecdsa.util.sigdecode_string)
 520         # check that we get the original signing address
 521         addr = public_key_to_bc_address( encode_point(public_key, compressed) )
 522         if address != addr:
 523             raise BaseException("Bad signature")
 524
 525
 526     def create_new_address(self, for_change):
 527         """   Publickey(type,n) = Master_public_key + H(n|S|type)*point  """
 528         curve = SECP256k1
 529         n = len(self.change_addresses) if for_change else len(self.addresses)
 530         z = self.get_sequence(n,for_change)
 531         master_public_key = ecdsa.VerifyingKey.from_string( self.master_public_key, curve = SECP256k1 )
 532         pubkey_point = master_public_key.pubkey.point + z*curve.generator
 533         public_key2 = ecdsa.VerifyingKey.from_public_point( pubkey_point, curve = SECP256k1 )
 534         address = public_key_to_bc_address( '04'.decode('hex') + public_key2.to_string() )
 535         if for_change:
 536             self.change_addresses.append(address)
 537         else:
 538             self.addresses.append(address)
 539
 540         self.history[address] = []
 541         print address
 542         return address
 543
 544
 545     def change_gap_limit(self, value):
 546         if value >= self.gap_limit:
 547             self.gap_limit = value
 548             self.save()
 549             self.interface.poke()
 550             return True
 551
 552         elif value >= self.min_acceptable_gap():
 553             k = self.num_unused_trailing_addresses()
 554             n = len(self.addresses) - k + value
 555             self.addresses = self.addresses[0:n]
 556             self.gap_limit = value
 557             self.save()
 558             return True
 559         else:
 560             return False
 561
 562     def num_unused_trailing_addresses(self):
 563         k = 0
 564         for a in self.addresses[::-1]:
 565             if self.history.get(a):break
 566             k = k + 1
 567         return k
 568
 569     def min_acceptable_gap(self):
 570         # fixme: this assumes wallet is synchronized
 571         n = 0
 572         nmax = 0
 573         k = self.num_unused_trailing_addresses()
 574         for a in self.addresses[0:-k]:
 575             if self.history.get(a):
 576                 n = 0
 577             else:
 578                 n += 1
 579                 if n > nmax: nmax = n
 580         return nmax + 1
 581
 582
 583     def synchronize(self):
 584         if not self.master_public_key:
 585             return []
 586
 587         new_addresses = []
 588         while True:
 589             if self.change_addresses == []:
 590                 new_addresses.append( self.create_new_address(True) )
 591                 continue
 592             a = self.change_addresses[-1]
 593             if self.history.get(a):
 594                 new_addresses.append( self.create_new_address(True) )
 595             else:
 596                 break
 597
 598         n = self.gap_limit
 599         while True:
 600             if len(self.addresses) < n:
 601                 new_addresses.append( self.create_new_address(False) )
 602                 continue
 603             if map( lambda a: self.history.get(a), self.addresses[-n:] ) == n*[[]]:
 604                 break
 605             else:
 606                 new_addresses.append( self.create_new_address(False) )
 607
 608         if self.remote_url:
 609             num = self.get_remote_number()
 610             while len(self.addresses)<num:
 611                 new_addresses.append( self.create_new_address(False) )
 612
 613         return new_addresses
 614
 615
 616     def get_remote_number(self):
 617         import jsonrpclib
 618         server = jsonrpclib.Server(self.remote_url)
 619         out = server.getnum()
 620         return out
 621
 622     def get_remote_mpk(self):
 623         import jsonrpclib
 624         server = jsonrpclib.Server(self.remote_url)
 625         out = server.getkey()
 626         return out
 627
 628     def is_found(self):
 629         return (len(self.change_addresses) > 1 ) or ( len(self.addresses) > self.gap_limit )
 630
 631     def fill_addressbook(self):
 632         for tx in self.tx_history.values():
 633             if tx['value']<0:
 634                 for i in tx['outputs']:
 635                     if not self.is_mine(i) and i not in self.addressbook:
 636                         self.addressbook.append(i)
 637         # redo labels
 638         self.update_tx_labels()
 639
 640
 641     def save(self):
 642         # TODO: Need special config storage class. Should not be mixed
 643         # up with the wallet.
 644         # Settings should maybe be stored in a flat ini file.
 645         s = {
 646             'seed_version': self.seed_version,
 647             'use_encryption': self.use_encryption,
 648             'use_change': self.use_change,
 649             'master_public_key': self.master_public_key.encode('hex'),
 650             'fee': self.fee,
 651             'server': self.server,
 652             'seed': self.seed,
 653             'addresses': self.addresses,
 654             'change_addresses': self.change_addresses,
 655             'history': self.history,
 656             'labels': self.labels,
 657             'contacts': self.addressbook,
 658             'imported_keys': self.imported_keys,
 659             'aliases': self.aliases,
 660             'authorities': self.authorities,
 661             'receipts': self.receipts,
 662             'num_zeros': self.num_zeros,
 663             'frozen_addresses': self.frozen_addresses,
 664             'prioritized_addresses': self.prioritized_addresses,
 665             'expert_mode': self.expert_mode,
 666             'gap_limit': self.gap_limit,
 667             'debug_server': self.debug_server,
 668             'conversion_currency': self.conversion_currency
 669         }
 670         f = open(self.path,"w")
 671         f.write( repr(s) )
 672         f.close()
 673         import stat
 674         os.chmod(self.path,stat.S_IREAD | stat.S_IWRITE)
 675
 676     def read(self):
 677         import interface
 678
 679         upgrade_msg = """This wallet seed is deprecated. Please run upgrade.py for a diagnostic."""
 680         self.file_exists = False
 681         try:
 682             f = open(self.path,"r")
 683             data = f.read()
 684             f.close()
 685         except:
 686             return
 687         try:
 688             d = ast.literal_eval( data )
 689             interface.old_to_new(d)
 690             self.seed_version = d.get('seed_version')
 691             self.master_public_key = d.get('master_public_key').decode('hex')
 692             self.use_encryption = d.get('use_encryption')
 693             self.use_change = bool(d.get('use_change', True))
 694             self.fee = int(d.get('fee'))
 695             self.seed = d.get('seed')
 696             self.server = d.get('server')
 697             self.addresses = d.get('addresses')
 698             self.change_addresses = d.get('change_addresses')
 699             self.history = d.get('history')
 700             self.labels = d.get('labels')
 701             self.addressbook = d.get('contacts')
 702             self.imported_keys = d.get('imported_keys', {})
 703             self.aliases = d.get('aliases', {})
 704             self.authorities = d.get('authorities', {})
 705             self.receipts = d.get('receipts', {})
 706             self.num_zeros = d.get('num_zeros', 0)
 707             self.frozen_addresses = d.get('frozen_addresses', [])
 708             self.prioritized_addresses = d.get('prioritized_addresses', [])
 709             self.expert_mode = d.get('expert_mode', False)
 710             self.gap_limit = d.get('gap_limit', 5)
 711             self.debug_server = d.get('debug_server', False)
 712             self.conversion_currency = d.get('conversion_currency', 'USD')
 713         except:
 714             raise BaseException("cannot read wallet file")
 715
 716         self.update_tx_history()
 717
 718         if self.seed_version != SEED_VERSION:
 719             raise BaseException(upgrade_msg)
 720
 721         if self.remote_url: assert self.master_public_key.encode('hex') == self.get_remote_mpk()
 722
 723         self.file_exists = True
 724
 725
 726     def get_address_flags(self, addr):
 727         flags = "C" if self.is_change(addr) else "I" if addr in self.imported_keys.keys() else "-"
 728         flags += "F" if addr in self.frozen_addresses else "P" if addr in self.prioritized_addresses else "-"
 729         return flags
 730
 731
 732     def get_addr_balance(self, addr):
 733         assert self.is_mine(addr)
 734         h = self.history.get(addr,[])
 735         c = u = 0
 736         for item in h:
 737             v = item['value']
 738             if item['height']:
 739                 c += v
 740             else:
 741                 u += v
 742         return c, u
 743
 744     def get_balance(self):
 745         conf = unconf = 0
 746         for addr in self.all_addresses():
 747             c, u = self.get_addr_balance(addr)
 748             conf += c
 749             unconf += u
 750         return conf, unconf
 751
 752
 753     def choose_tx_inputs( self, amount, fixed_fee, from_addr = None ):
 754         """ todo: minimize tx size """
 755         total = 0
 756         fee = self.fee if fixed_fee is None else fixed_fee
 757
 758         coins = []
 759         prioritized_coins = []
 760         domain = [from_addr] if from_addr else self.all_addresses()
 761         for i in self.frozen_addresses:
 762             if i in domain: domain.remove(i)
 763
 764         for i in self.prioritized_addresses:
 765             if i in domain: domain.remove(i)
 766
 767         for addr in domain:
 768             h = self.history.get(addr)
 769             if h is None: continue
 770             for item in h:
 771                 if item.get('raw_output_script'):
 772                     coins.append( (addr,item))
 773
 774         coins = sorted( coins, key = lambda x: x[1]['timestamp'] )
 775
 776         for addr in self.prioritized_addresses:
 777             h = self.history.get(addr)
 778             if h is None: continue
 779             for item in h:
 780                 if item.get('raw_output_script'):
 781                     prioritized_coins.append( (addr,item))
 782
 783         prioritized_coins = sorted( prioritized_coins, key = lambda x: x[1]['timestamp'] )
 784
 785         inputs = []
 786         coins = prioritized_coins + coins
 787
 788         for c in coins:
 789             addr, item = c
 790             v = item.get('value')
 791             total += v
 792             inputs.append((addr, v, item['tx_hash'], item['index'], item['raw_output_script'], None, None) )
 793             fee = self.fee*len(inputs) if fixed_fee is None else fixed_fee
 794             if total >= amount + fee: break
 795         else:
 796             #print "not enough funds: %s %s"%(format_satoshis(total), format_satoshis(fee))
 797             inputs = []
 798         return inputs, total, fee
 799
 800     def choose_tx_outputs( self, to_addr, amount, fee, total, change_addr=None ):
 801         outputs = [ (to_addr, amount) ]
 802         change_amount = total - ( amount + fee )
 803         if change_amount != 0:
 804             # normally, the update thread should ensure that the last change address is unused
 805             if not change_addr:
 806                 change_addr = self.change_addresses[-1]
 807             outputs.append( ( change_addr,  change_amount) )
 808         return outputs
 809
 810     def sign_inputs( self, inputs, outputs, password ):
 811         s_inputs = []
 812         for i in range(len(inputs)):
 813             addr, v, p_hash, p_pos, p_scriptPubKey, _, _ = inputs[i]
 814             private_key = ecdsa.SigningKey.from_string( self.get_private_key(addr, password), curve = SECP256k1 )
 815             public_key = private_key.get_verifying_key()
 816             pubkey = public_key.to_string()
 817             tx = filter( raw_tx( inputs, outputs, for_sig = i ) )
 818             sig = private_key.sign_digest( Hash( tx.decode('hex') ), sigencode = ecdsa.util.sigencode_der )
 819             assert public_key.verify_digest( sig, Hash( tx.decode('hex') ), sigdecode = ecdsa.util.sigdecode_der)
 820             s_inputs.append( (addr, v, p_hash, p_pos, p_scriptPubKey, pubkey, sig) )
 821         return s_inputs
 822
 823     def pw_encode(self, s, password):
 824         if password:
 825             secret = Hash(password)
 826             return EncodeAES(secret, s)
 827         else:
 828             return s
 829
 830     def pw_decode(self, s, password):
 831         if password is not None:
 832             secret = Hash(password)
 833             d = DecodeAES(secret, s)
 834             if s == self.seed:
 835                 try:
 836                     d.decode('hex')
 837                 except:
 838                     raise BaseException("Invalid password")
 839             return d
 840         else:
 841             return s
 842
 843     def get_status(self, address):
 844         h = self.history.get(address)
 845         if not h:
 846             status = None
 847         else:
 848             lastpoint = h[-1]
 849             status = lastpoint['block_hash']
 850             if status == 'mempool':
 851                 status = status + ':%d'% len(h)
 852         return status
 853
 854     def receive_status_callback(self, addr, status):
 855         with self.lock:
 856             if self.get_status(addr) != status:
 857                 #print "updating status for", addr, status
 858                 self.interface.get_history(addr)
 859
 860     def receive_history_callback(self, addr, data):
 861         #print "updating history for", addr
 862         with self.lock:
 863             self.history[addr] = data
 864             self.update_tx_history()
 865             self.save()
 866
 867     def get_tx_history(self):
 868         lines = self.tx_history.values()
 869         lines = sorted(lines, key=operator.itemgetter("timestamp"))
 870         return lines
 871
 872     def update_tx_history(self):
 873         self.tx_history= {}
 874         for addr in self.all_addresses():
 875             h = self.history.get(addr)
 876             if h is None: continue
 877             for tx in h:
 878                 tx_hash = tx['tx_hash']
 879                 line = self.tx_history.get(tx_hash)
 880                 if not line:
 881                     self.tx_history[tx_hash] = copy.copy(tx)
 882                     line = self.tx_history.get(tx_hash)
 883                 else:
 884                     line['value'] += tx['value']
 885                 if line['height'] == 0:
 886                     line['timestamp'] = 1e12
 887         self.update_tx_labels()
 888
 889     def update_tx_labels(self):
 890         for tx in self.tx_history.values():
 891             default_label = ''
 892             if tx['value']<0:
 893                 for o_addr in tx['outputs']:
 894                     if not self.is_mine(o_addr):
 895                         dest_label = self.labels.get(o_addr)
 896                         if dest_label:
 897                             default_label = 'to: ' + dest_label
 898                         else:
 899                             default_label = 'to: ' + o_addr
 900             else:
 901                 for o_addr in tx['outputs']:
 902                     if self.is_mine(o_addr) and not self.is_change(o_addr):
 903                         break
 904                 else:
 905                     for o_addr in tx['outputs']:
 906                         if self.is_mine(o_addr):
 907                             break
 908                     else:
 909                         o_addr = None
 910
 911                 if o_addr:
 912                     dest_label = self.labels.get(o_addr)
 913                     if dest_label:
 914                         default_label = 'at: ' + dest_label
 915                     else:
 916                         default_label = 'at: ' + o_addr
 917
 918             tx['default_label'] = default_label
 919
 920     def mktx(self, to_address, amount, label, password, fee=None, change_addr=None, from_addr= None):
 921         if not self.is_valid(to_address):
 922             raise BaseException("Invalid address")
 923         inputs, total, fee = self.choose_tx_inputs( amount, fee, from_addr )
 924         if not inputs:
 925             raise BaseException("Not enough funds")
 926
 927         if not self.use_change and not change_addr:
 928             change_addr = inputs[0][0]
 929             print "Sending change to", change_addr
 930
 931         outputs = self.choose_tx_outputs( to_address, amount, fee, total, change_addr )
 932         s_inputs = self.sign_inputs( inputs, outputs, password )
 933
 934         tx = filter( raw_tx( s_inputs, outputs ) )
 935         if to_address not in self.addressbook:
 936             self.addressbook.append(to_address)
 937         if label:
 938             tx_hash = Hash(tx.decode('hex') )[::-1].encode('hex')
 939             self.labels[tx_hash] = label
 940
 941         return tx
 942
 943     def sendtx(self, tx):
 944         tx_hash = Hash(tx.decode('hex') )[::-1].encode('hex')
 945         self.tx_event.clear()
 946         self.interface.send([('blockchain.transaction.broadcast', [tx])])
 947         self.tx_event.wait()
 948         out = self.tx_result
 949         if out != tx_hash:
 950             return False, "error: " + out
 951         if self.receipt:
 952             self.receipts[tx_hash] = self.receipt
 953             self.receipt = None
 954         return True, out
 955
 956
 957     def read_alias(self, alias):
 958         # this might not be the right place for this function.
 959         import urllib
 960
 961         m1 = re.match('([\w\-\.]+)@((\w[\w\-]+\.)+[\w\-]+)', alias)
 962         m2 = re.match('((\w[\w\-]+\.)+[\w\-]+)', alias)
 963         if m1:
 964             url = 'http://' + m1.group(2) + '/bitcoin.id/' + m1.group(1)
 965         elif m2:
 966             url = 'http://' + alias + '/bitcoin.id'
 967         else:
 968             return ''
 969         try:
 970             lines = urllib.urlopen(url).readlines()
 971         except:
 972             return ''
 973
 974         # line 0
 975         line = lines[0].strip().split(':')
 976         if len(line) == 1:
 977             auth_name = None
 978             target = signing_addr = line[0]
 979         else:
 980             target, auth_name, signing_addr, signature = line
 981             msg = "alias:%s:%s:%s"%(alias,target,auth_name)
 982             print msg, signature
 983             self.verify_message(signing_addr, signature, msg)
 984
 985         # other lines are signed updates
 986         for line in lines[1:]:
 987             line = line.strip()
 988             if not line: continue
 989             line = line.split(':')
 990             previous = target
 991             print repr(line)
 992             target, signature = line
 993             self.verify_message(previous, signature, "alias:%s:%s"%(alias,target))
 994
 995         if not self.is_valid(target):
 996             raise BaseException("Invalid bitcoin address")
 997
 998         return target, signing_addr, auth_name
 999
1000     def update_password(self, seed, old_password, new_password):
1001         if new_password == '': new_password = None
1002         self.use_encryption = (new_password != None)
1003         self.seed = self.pw_encode( seed, new_password)
1004         for k in self.imported_keys.keys():
1005             a = self.imported_keys[k]
1006             b = self.pw_decode(a, old_password)
1007             c = self.pw_encode(b, new_password)
1008             self.imported_keys[k] = c
1009         self.save()
1010
1011     def get_alias(self, alias, interactive = False, show_message=None, question = None):
1012         try:
1013             target, signing_address, auth_name = self.read_alias(alias)
1014         except BaseException, e:
1015             # raise exception if verify fails (verify the chain)
1016             if interactive:
1017                 show_message("Alias error: " + str(e))
1018             return
1019
1020         print target, signing_address, auth_name
1021
1022         if auth_name is None:
1023             a = self.aliases.get(alias)
1024             if not a:
1025                 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)
1026                 if interactive and question( msg ):
1027                     self.aliases[alias] = (signing_address, target)
1028                 else:
1029                     target = None
1030             else:
1031                 if signing_address != a[0]:
1032                     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
1033                     if interactive and question( msg ):
1034                         self.aliases[alias] = (signing_address, target)
1035                     else:
1036                         target = None
1037         else:
1038             if signing_address not in self.authorities.keys():
1039                 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)
1040                 if interactive and question( msg ):
1041                     self.authorities[signing_address] = auth_name
1042                 else:
1043                     target = None
1044
1045         if target:
1046             self.aliases[alias] = (signing_address, target)
1047
1048         return target
1049
1050
1051     def parse_url(self, url, show_message, question):
1052         o = url[8:].split('?')
1053         address = o[0]
1054         if len(o)>1:
1055             params = o[1].split('&')
1056         else:
1057             params = []
1058
1059         amount = label = message = signature = identity = ''
1060         for p in params:
1061             k,v = p.split('=')
1062             uv = urldecode(v)
1063             if k == 'amount': amount = uv
1064             elif k == 'message': message = uv
1065             elif k == 'label': label = uv
1066             elif k == 'signature':
1067                 identity, signature = uv.split(':')
1068                 url = url.replace('&%s=%s'%(k,v),'')
1069             else:
1070                 print k,v
1071
1072         if label and self.labels.get(address) != label:
1073             if question('Give label "%s" to address %s ?'%(label,address)):
1074                 if address not in self.addressbook and address not in self.all_addresses():
1075                     self.addressbook.append(address)
1076                 self.labels[address] = label
1077
1078         if signature:
1079             if re.match('^(|([\w\-\.]+)@)((\w[\w\-]+\.)+[\w\-]+)$', identity):
1080                 signing_address = self.get_alias(identity, True, show_message, question)
1081             elif self.is_valid(identity):
1082                 signing_address = identity
1083             else:
1084                 signing_address = None
1085             if not signing_address:
1086                 return
1087             try:
1088                 self.verify_message(signing_address, signature, url )
1089                 self.receipt = (signing_address, signature, url)
1090             except:
1091                 show_message('Warning: the URI contains a bad signature.\nThe identity of the recipient cannot be verified.')
1092                 address = amount = label = identity = message = ''
1093
1094         if re.match('^(|([\w\-\.]+)@)((\w[\w\-]+\.)+[\w\-]+)$', address):
1095             payto_address = self.get_alias(address, True, show_message, question)
1096             if payto_address:
1097                 address = address + ' <' + payto_address + '>'
1098
1099         return address, amount, label, message, signature, identity, url
1100
1101
1102     def update(self):
1103         self.interface.poke()
1104         self.up_to_date_event.wait(10000000000)
1105
1106
1107     def start_session(self, interface):
1108         self.interface = interface
1109         self.interface.send([('server.banner',[]), ('blockchain.numblocks.subscribe',[]), ('server.peers.subscribe',[])])
1110         self.interface.subscribe(self.all_addresses())
1111
1112
1113     def freeze(self,addr):
1114         if addr in self.all_addresses() and addr not in self.frozen_addresses:
1115             self.unprioritize(addr)
1116             self.frozen_addresses.append(addr)
1117             self.save()
1118             return True
1119         else:
1120             return False
1121
1122     def unfreeze(self,addr):
1123         if addr in self.all_addresses() and addr in self.frozen_addresses:
1124             self.frozen_addresses.remove(addr)
1125             self.save()
1126             return True
1127         else:
1128             return False
1129
1130     def prioritize(self,addr):
1131         if addr in self.all_addresses() and addr not in self.prioritized_addresses:
1132             self.unfreeze(addr)
1133             self.prioritized_addresses.append(addr)
1134             self.save()
1135             return True
1136         else:
1137             return False
1138
1139     def unprioritize(self,addr):
1140         if addr in self.all_addresses() and addr in self.prioritized_addresses:
1141             self.prioritized_addresses.remove(addr)
1142             self.save()
1143             return True
1144         else:
1145             return False