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
  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 # get password routine
 151 def prompt_password(prompt, confirm=True):
 152     if sys.stdin.isatty():
 153         password = getpass.getpass(prompt)
 154
 155         if password and confirm:
 156             password2 = getpass.getpass("Confirm: ")
 157
 158             if password != password2:
 159                 sys.stderr.write("Error: Passwords do not match.\n")
 160                 sys.stderr.flush()
 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
 285         # saved fields
 286         self.use_encryption = False
 287         self.addresses = []          # receiving addresses visible for user
 288         self.change_addresses = []   # addresses used as change
 289         self.seed = ''               # encrypted
 290         self.history = {}
 291         self.labels = {}             # labels for addresses and transactions
 292         self.aliases = {}            # aliases for addresses
 293         self.authorities = {}        # trusted addresses
 294         self.frozen_addresses = []
 295         self.prioritized_addresses = []
 296         self.expert_mode = False
 297
 298         self.receipts = {}           # signed URIs
 299         self.receipt = None          # next receipt
 300         self.addressbook = []        # outgoing addresses, for payments
 301         self.debug_server = False    # write server communication debug info to stdout
 302
 303         # not saved
 304         self.tx_history = {}
 305
 306         self.imported_keys = {}
 307         self.remote_url = None
 308
 309         self.was_updated = True
 310         self.blocks = -1
 311         self.banner = ''
 312
 313         # there is a difference between self.up_to_date and self.is_up_to_date()
 314         # self.is_up_to_date() returns true when all requests have been answered and processed
 315         # self.up_to_date is true when the wallet is synchronized (stronger requirement)
 316         self.up_to_date_event = threading.Event()
 317         self.up_to_date_event.clear()
 318         self.up_to_date = False
 319         self.lock = threading.Lock()
 320         self.tx_event = threading.Event()
 321
 322         self.pick_random_server()
 323
 324     def register_callback(self, update_callback):
 325         with self.lock:
 326             self.update_callbacks.append(update_callback)
 327
 328     def trigger_callbacks(self):
 329         with self.lock:
 330             callbacks = self.update_callbacks[:]
 331         [update() for update in callbacks]
 332
 333     def pick_random_server(self):
 334         self.server = random.choice( DEFAULT_SERVERS )         # random choice when the wallet is created
 335
 336     def is_up_to_date(self):
 337         return self.interface.responses.empty() and not self.interface.unanswered_requests
 338
 339     def set_server(self, server):
 340         # raise an error if the format isnt correct
 341         a,b,c = server.split(':')
 342         b = int(b)
 343         assert c in ['t','h','n']
 344         # set the server
 345         if server != self.server:
 346             self.server = server
 347             self.save()
 348             self.interface.is_connected = False  # this exits the polling loop
 349             self.interface.poke()
 350
 351     def set_path(self, wallet_path):
 352
 353         if wallet_path is not None:
 354             self.path = wallet_path
 355         else:
 356             # backward compatibility: look for wallet file in the default data directory
 357             if "HOME" in os.environ:
 358                 wallet_dir = os.path.join( os.environ["HOME"], '.electrum')
 359             elif "LOCALAPPDATA" in os.environ:
 360                 wallet_dir = os.path.join( os.environ["LOCALAPPDATA"], 'Electrum' )
 361             elif "APPDATA" in os.environ:
 362                 wallet_dir = os.path.join( os.environ["APPDATA"], 'Electrum' )
 363             else:
 364                 raise BaseException("No home directory found in environment variables.")
 365
 366             if not os.path.exists( wallet_dir ): os.mkdir( wallet_dir )
 367             self.path = os.path.join( wallet_dir, 'electrum.dat' )
 368
 369     def import_key(self, keypair, password):
 370         address, key = keypair.split(':')
 371         if not self.is_valid(address):
 372             raise BaseException('Invalid Bitcoin address')
 373         if address in self.all_addresses():
 374             raise BaseException('Address already in wallet')
 375         b = ASecretToSecret( key )
 376         if not b:
 377             raise BaseException('Unsupported key format')
 378         secexp = int( b.encode('hex'), 16)
 379         private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve=SECP256k1 )
 380         # sanity check
 381         public_key = private_key.get_verifying_key()
 382         if not address == public_key_to_bc_address( '04'.decode('hex') + public_key.to_string() ):
 383             raise BaseException('Address does not match private key')
 384         self.imported_keys[address] = self.pw_encode( key, password )
 385
 386     def new_seed(self, password):
 387         seed = "%032x"%ecdsa.util.randrange( pow(2,128) )
 388         #self.init_mpk(seed)
 389         # encrypt
 390         self.seed = self.pw_encode( seed, password )
 391
 392
 393     def init_mpk(self,seed):
 394         # public key
 395         curve = SECP256k1
 396         secexp = self.stretch_key(seed)
 397         master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 398         self.master_public_key = master_private_key.get_verifying_key().to_string()
 399
 400     def all_addresses(self):
 401         return self.addresses + self.change_addresses + self.imported_keys.keys()
 402
 403     def is_mine(self, address):
 404         return address in self.all_addresses()
 405
 406     def is_change(self, address):
 407         return address in self.change_addresses
 408
 409     def is_valid(self,addr):
 410         ADDRESS_RE = re.compile('[1-9A-HJ-NP-Za-km-z]{26,}\\Z')
 411         if not ADDRESS_RE.match(addr): return False
 412         try:
 413             h = bc_address_to_hash_160(addr)
 414         except:
 415             return False
 416         return addr == hash_160_to_bc_address(h)
 417
 418     def stretch_key(self,seed):
 419         oldseed = seed
 420         for i in range(100000):
 421             seed = hashlib.sha256(seed + oldseed).digest()
 422         return string_to_number( seed )
 423
 424     def get_sequence(self,n,for_change):
 425         return string_to_number( Hash( "%d:%d:"%(n,for_change) + self.master_public_key ) )
 426
 427     def get_private_key_base58(self, address, password):
 428         pk = self.get_private_key(address, password)
 429         if pk is None: return None
 430         return SecretToASecret( pk )
 431
 432     def get_private_key(self, address, password):
 433         """  Privatekey(type,n) = Master_private_key + H(n|S|type)  """
 434         order = generator_secp256k1.order()
 435
 436         if address in self.imported_keys.keys():
 437             b = self.pw_decode( self.imported_keys[address], password )
 438             if not b: return None
 439             b = ASecretToSecret( b )
 440             secexp = int( b.encode('hex'), 16)
 441         else:
 442             if address in self.addresses:
 443                 n = self.addresses.index(address)
 444                 for_change = False
 445             elif address in self.change_addresses:
 446                 n = self.change_addresses.index(address)
 447                 for_change = True
 448             else:
 449                 raise BaseException("unknown address")
 450             try:
 451                 seed = self.pw_decode( self.seed, password)
 452             except:
 453                 raise BaseException("Invalid password")
 454             if not seed: return None
 455             secexp = self.stretch_key(seed)
 456             secexp = ( secexp + self.get_sequence(n,for_change) ) % order
 457
 458         pk = number_to_string(secexp,order)
 459         return pk
 460
 461     def msg_magic(self, message):
 462         return "\x18Bitcoin Signed Message:\n" + chr( len(message) ) + message
 463
 464     def sign_message(self, address, message, password):
 465         private_key = ecdsa.SigningKey.from_string( self.get_private_key(address, password), curve = SECP256k1 )
 466         public_key = private_key.get_verifying_key()
 467         signature = private_key.sign_digest( Hash( self.msg_magic( message ) ), sigencode = ecdsa.util.sigencode_string )
 468         assert public_key.verify_digest( signature, Hash( self.msg_magic( message ) ), sigdecode = ecdsa.util.sigdecode_string)
 469         for i in range(4):
 470             sig = base64.b64encode( chr(27+i) + signature )
 471             try:
 472                 self.verify_message( address, sig, message)
 473                 return sig
 474             except:
 475                 continue
 476         else:
 477             raise BaseException("error: cannot sign message")
 478
 479
 480     def verify_message(self, address, signature, message):
 481         """ See http://www.secg.org/download/aid-780/sec1-v2.pdf for the math """
 482         from ecdsa import numbertheory, ellipticcurve, util
 483         import msqr
 484         curve = curve_secp256k1
 485         G = generator_secp256k1
 486         order = G.order()
 487         # extract r,s from signature
 488         sig = base64.b64decode(signature)
 489         if len(sig) != 65: raise BaseException("Wrong encoding")
 490         r,s = util.sigdecode_string(sig[1:], order)
 491         nV = ord(sig[0])
 492         if nV < 27 or nV >= 35:
 493             raise BaseException("Bad encoding")
 494         if nV >= 31:
 495             compressed = True
 496             nV -= 4
 497         else:
 498             compressed = False
 499
 500         recid = nV - 27
 501         # 1.1
 502         x = r + (recid/2) * order
 503         # 1.3
 504         alpha = ( x * x * x  + curve.a() * x + curve.b() ) % curve.p()
 505         beta = msqr.modular_sqrt(alpha, curve.p())
 506         y = beta if (beta - recid) % 2 == 0 else curve.p() - beta
 507         # 1.4 the constructor checks that nR is at infinity
 508         R = ellipticcurve.Point(curve, x, y, order)
 509         # 1.5 compute e from message:
 510         h = Hash( self.msg_magic( message ) )
 511         e = string_to_number(h)
 512         minus_e = -e % order
 513         # 1.6 compute Q = r^-1 (sR - eG)
 514         inv_r = numbertheory.inverse_mod(r,order)
 515         Q = inv_r * ( s * R + minus_e * G )
 516         public_key = ecdsa.VerifyingKey.from_public_point( Q, curve = SECP256k1 )
 517         # check that Q is the public key
 518         public_key.verify_digest( sig[1:], h, sigdecode = ecdsa.util.sigdecode_string)
 519         # check that we get the original signing address
 520         addr = public_key_to_bc_address( encode_point(public_key, compressed) )
 521         if address != addr:
 522             raise BaseException("Bad signature")
 523
 524
 525     def create_new_address(self, for_change):
 526         """   Publickey(type,n) = Master_public_key + H(n|S|type)*point  """
 527         curve = SECP256k1
 528         n = len(self.change_addresses) if for_change else len(self.addresses)
 529         z = self.get_sequence(n,for_change)
 530         master_public_key = ecdsa.VerifyingKey.from_string( self.master_public_key, curve = SECP256k1 )
 531         pubkey_point = master_public_key.pubkey.point + z*curve.generator
 532         public_key2 = ecdsa.VerifyingKey.from_public_point( pubkey_point, curve = SECP256k1 )
 533         address = public_key_to_bc_address( '04'.decode('hex') + public_key2.to_string() )
 534         if for_change:
 535             self.change_addresses.append(address)
 536         else:
 537             self.addresses.append(address)
 538
 539         self.history[address] = []
 540         print address
 541         return address
 542
 543
 544     def change_gap_limit(self, value):
 545         if value >= self.gap_limit:
 546             self.gap_limit = value
 547             self.save()
 548             self.interface.poke()
 549             return True
 550
 551         elif value >= self.min_acceptable_gap():
 552             k = self.num_unused_trailing_addresses()
 553             n = len(self.addresses) - k + value
 554             self.addresses = self.addresses[0:n]
 555             self.gap_limit = value
 556             self.save()
 557             return True
 558         else:
 559             return False
 560
 561     def num_unused_trailing_addresses(self):
 562         k = 0
 563         for a in self.addresses[::-1]:
 564             if self.history.get(a):break
 565             k = k + 1
 566         return k
 567
 568     def min_acceptable_gap(self):
 569         # fixme: this assumes wallet is synchronized
 570         n = 0
 571         nmax = 0
 572         k = self.num_unused_trailing_addresses()
 573         for a in self.addresses[0:-k]:
 574             if self.history.get(a):
 575                 n = 0
 576             else:
 577                 n += 1
 578                 if n > nmax: nmax = n
 579         return nmax + 1
 580
 581
 582     def synchronize(self):
 583         if not self.master_public_key:
 584             return []
 585
 586         new_addresses = []
 587         while True:
 588             if self.change_addresses == []:
 589                 new_addresses.append( self.create_new_address(True) )
 590                 continue
 591             a = self.change_addresses[-1]
 592             if self.history.get(a):
 593                 new_addresses.append( self.create_new_address(True) )
 594             else:
 595                 break
 596
 597         n = self.gap_limit
 598         while True:
 599             if len(self.addresses) < n:
 600                 new_addresses.append( self.create_new_address(False) )
 601                 continue
 602             if map( lambda a: self.history.get(a), self.addresses[-n:] ) == n*[[]]:
 603                 break
 604             else:
 605                 new_addresses.append( self.create_new_address(False) )
 606
 607         if self.remote_url:
 608             num = self.get_remote_number()
 609             while len(self.addresses)<num:
 610                 new_addresses.append( self.create_new_address(False) )
 611
 612         return new_addresses
 613
 614
 615     def get_remote_number(self):
 616         import jsonrpclib
 617         server = jsonrpclib.Server(self.remote_url)
 618         out = server.getnum()
 619         return out
 620
 621     def get_remote_mpk(self):
 622         import jsonrpclib
 623         server = jsonrpclib.Server(self.remote_url)
 624         out = server.getkey()
 625         return out
 626
 627     def is_found(self):
 628         return (len(self.change_addresses) > 1 ) or ( len(self.addresses) > self.gap_limit )
 629
 630     def fill_addressbook(self):
 631         for tx in self.tx_history.values():
 632             if tx['value']<0:
 633                 for i in tx['outputs']:
 634                     if not self.is_mine(i) and i not in self.addressbook:
 635                         self.addressbook.append(i)
 636         # redo labels
 637         self.update_tx_labels()
 638
 639
 640     def save(self):
 641         s = {
 642             'seed_version':self.seed_version,
 643             'use_encryption':self.use_encryption,
 644             'use_change':self.use_change,
 645             'master_public_key': self.master_public_key.encode('hex'),
 646             'fee':self.fee,
 647             'server':self.server,
 648             'seed':self.seed,
 649             'addresses':self.addresses,
 650             'change_addresses':self.change_addresses,
 651             'history':self.history,
 652             'labels':self.labels,
 653             'contacts':self.addressbook,
 654             'imported_keys':self.imported_keys,
 655             'aliases':self.aliases,
 656             'authorities':self.authorities,
 657             'receipts':self.receipts,
 658             'num_zeros':self.num_zeros,
 659             'frozen_addresses':self.frozen_addresses,
 660             'prioritized_addresses':self.prioritized_addresses,
 661             'expert_mode':self.expert_mode,
 662             'gap_limit':self.gap_limit,
 663             'debug_server':self.debug_server,
 664             }
 665         f = open(self.path,"w")
 666         f.write( repr(s) )
 667         f.close()
 668         import stat
 669         os.chmod(self.path,stat.S_IREAD | stat.S_IWRITE)
 670
 671     def read(self):
 672         import interface
 673
 674         upgrade_msg = """This wallet seed is deprecated. Please run upgrade.py for a diagnostic."""
 675         self.file_exists = False
 676         try:
 677             f = open(self.path,"r")
 678             data = f.read()
 679             f.close()
 680         except:
 681             return
 682         try:
 683             d = ast.literal_eval( data )
 684             interface.old_to_new(d)
 685             self.seed_version = d.get('seed_version')
 686             self.master_public_key = d.get('master_public_key').decode('hex')
 687             self.use_encryption = d.get('use_encryption')
 688             self.use_change = bool(d.get('use_change',True))
 689             self.fee = int( d.get('fee') )
 690             self.seed = d.get('seed')
 691             self.server = d.get('server')
 692             #blocks = d.get('blocks')
 693             self.addresses = d.get('addresses')
 694             self.change_addresses = d.get('change_addresses')
 695             self.history = d.get('history')
 696             self.labels = d.get('labels')
 697             self.addressbook = d.get('contacts')
 698             self.imported_keys = d.get('imported_keys',{})
 699             self.aliases = d.get('aliases',{})
 700             self.authorities = d.get('authorities',{})
 701             self.receipts = d.get('receipts',{})
 702             self.num_zeros = d.get('num_zeros',0)
 703             self.frozen_addresses = d.get('frozen_addresses',[])
 704             self.prioritized_addresses = d.get('prioritized_addresses',[])
 705             self.expert_mode = d.get('expert_mode',False)
 706             self.gap_limit = d.get('gap_limit',5)
 707             self.debug_server = d.get('debug_server',False)
 708         except:
 709             raise BaseException("cannot read wallet file")
 710
 711         self.update_tx_history()
 712
 713         if self.seed_version != SEED_VERSION:
 714             raise BaseException(upgrade_msg)
 715
 716         if self.remote_url: assert self.master_public_key.encode('hex') == self.get_remote_mpk()
 717
 718         self.file_exists = True
 719
 720
 721     def get_address_flags(self, addr):
 722         flags = "C" if self.is_change(addr) else "I" if addr in self.imported_keys.keys() else "-"
 723         flags += "F" if addr in self.frozen_addresses else "P" if addr in self.prioritized_addresses else "-"
 724         return flags
 725
 726
 727     def get_addr_balance(self, addr):
 728         assert self.is_mine(addr)
 729         h = self.history.get(addr,[])
 730         c = u = 0
 731         for item in h:
 732             v = item['value']
 733             if item['height']:
 734                 c += v
 735             else:
 736                 u += v
 737         return c, u
 738
 739     def get_balance(self):
 740         conf = unconf = 0
 741         for addr in self.all_addresses():
 742             c, u = self.get_addr_balance(addr)
 743             conf += c
 744             unconf += u
 745         return conf, unconf
 746
 747
 748     def choose_tx_inputs( self, amount, fixed_fee, from_addr = None ):
 749         """ todo: minimize tx size """
 750         total = 0
 751         fee = self.fee if fixed_fee is None else fixed_fee
 752
 753         coins = []
 754         prioritized_coins = []
 755         domain = [from_addr] if from_addr else self.all_addresses()
 756         for i in self.frozen_addresses:
 757             if i in domain: domain.remove(i)
 758
 759         for i in self.prioritized_addresses:
 760             if i in domain: domain.remove(i)
 761
 762         for addr in domain:
 763             h = self.history.get(addr)
 764             if h is None: continue
 765             for item in h:
 766                 if item.get('raw_output_script'):
 767                     coins.append( (addr,item))
 768
 769         coins = sorted( coins, key = lambda x: x[1]['timestamp'] )
 770
 771         for addr in self.prioritized_addresses:
 772             h = self.history.get(addr)
 773             if h is None: continue
 774             for item in h:
 775                 if item.get('raw_output_script'):
 776                     prioritized_coins.append( (addr,item))
 777
 778         prioritized_coins = sorted( prioritized_coins, key = lambda x: x[1]['timestamp'] )
 779
 780         inputs = []
 781         coins = prioritized_coins + coins
 782
 783         for c in coins:
 784             addr, item = c
 785             v = item.get('value')
 786             total += v
 787             inputs.append((addr, v, item['tx_hash'], item['index'], item['raw_output_script'], None, None) )
 788             fee = self.fee*len(inputs) if fixed_fee is None else fixed_fee
 789             if total >= amount + fee: break
 790         else:
 791             #print "not enough funds: %s %s"%(format_satoshis(total), format_satoshis(fee))
 792             inputs = []
 793         return inputs, total, fee
 794
 795     def choose_tx_outputs( self, to_addr, amount, fee, total, change_addr=None ):
 796         outputs = [ (to_addr, amount) ]
 797         change_amount = total - ( amount + fee )
 798         if change_amount != 0:
 799             # normally, the update thread should ensure that the last change address is unused
 800             if not change_addr:
 801                 change_addr = self.change_addresses[-1]
 802             outputs.append( ( change_addr,  change_amount) )
 803         return outputs
 804
 805     def sign_inputs( self, inputs, outputs, password ):
 806         s_inputs = []
 807         for i in range(len(inputs)):
 808             addr, v, p_hash, p_pos, p_scriptPubKey, _, _ = inputs[i]
 809             private_key = ecdsa.SigningKey.from_string( self.get_private_key(addr, password), curve = SECP256k1 )
 810             public_key = private_key.get_verifying_key()
 811             pubkey = public_key.to_string()
 812             tx = filter( raw_tx( inputs, outputs, for_sig = i ) )
 813             sig = private_key.sign_digest( Hash( tx.decode('hex') ), sigencode = ecdsa.util.sigencode_der )
 814             assert public_key.verify_digest( sig, Hash( tx.decode('hex') ), sigdecode = ecdsa.util.sigdecode_der)
 815             s_inputs.append( (addr, v, p_hash, p_pos, p_scriptPubKey, pubkey, sig) )
 816         return s_inputs
 817
 818     def pw_encode(self, s, password):
 819         if password:
 820             secret = Hash(password)
 821             return EncodeAES(secret, s)
 822         else:
 823             return s
 824
 825     def pw_decode(self, s, password):
 826         if password is not None:
 827             secret = Hash(password)
 828             d = DecodeAES(secret, s)
 829             if s == self.seed:
 830                 try:
 831                     d.decode('hex')
 832                 except:
 833                     raise BaseException("Invalid password")
 834             return d
 835         else:
 836             return s
 837
 838     def get_status(self, address):
 839         h = self.history.get(address)
 840         if not h:
 841             status = None
 842         else:
 843             lastpoint = h[-1]
 844             status = lastpoint['block_hash']
 845             if status == 'mempool':
 846                 status = status + ':%d'% len(h)
 847         return status
 848
 849     def receive_status_callback(self, addr, status):
 850         with self.lock:
 851             if self.get_status(addr) != status:
 852                 #print "updating status for", addr, status
 853                 self.interface.get_history(addr)
 854
 855     def receive_history_callback(self, addr, data):
 856         #print "updating history for", addr
 857         with self.lock:
 858             self.history[addr] = data
 859             self.update_tx_history()
 860             self.save()
 861
 862     def get_tx_history(self):
 863         lines = self.tx_history.values()
 864         lines = sorted(lines, key=operator.itemgetter("timestamp"))
 865         return lines
 866
 867     def update_tx_history(self):
 868         self.tx_history= {}
 869         for addr in self.all_addresses():
 870             h = self.history.get(addr)
 871             if h is None: continue
 872             for tx in h:
 873                 tx_hash = tx['tx_hash']
 874                 line = self.tx_history.get(tx_hash)
 875                 if not line:
 876                     self.tx_history[tx_hash] = copy.copy(tx)
 877                     line = self.tx_history.get(tx_hash)
 878                 else:
 879                     line['value'] += tx['value']
 880                 if line['height'] == 0:
 881                     line['timestamp'] = 1e12
 882         self.update_tx_labels()
 883
 884     def update_tx_labels(self):
 885         for tx in self.tx_history.values():
 886             default_label = ''
 887             if tx['value']<0:
 888                 for o_addr in tx['outputs']:
 889                     if not self.is_mine(o_addr):
 890                         dest_label = self.labels.get(o_addr)
 891                         if dest_label:
 892                             default_label = 'to: ' + dest_label
 893                         else:
 894                             default_label = 'to: ' + o_addr
 895             else:
 896                 for o_addr in tx['outputs']:
 897                     if self.is_mine(o_addr) and not self.is_change(o_addr):
 898                         break
 899                 else:
 900                     for o_addr in tx['outputs']:
 901                         if self.is_mine(o_addr):
 902                             break
 903                     else:
 904                         o_addr = None
 905
 906                 if o_addr:
 907                     dest_label = self.labels.get(o_addr)
 908                     if dest_label:
 909                         default_label = 'at: ' + dest_label
 910                     else:
 911                         default_label = 'at: ' + o_addr
 912
 913             tx['default_label'] = default_label
 914
 915     def mktx(self, to_address, amount, label, password, fee=None, change_addr=None, from_addr= None):
 916         if not self.is_valid(to_address):
 917             raise BaseException("Invalid address")
 918         inputs, total, fee = self.choose_tx_inputs( amount, fee, from_addr )
 919         if not inputs:
 920             raise BaseException("Not enough funds")
 921
 922         if not self.use_change and not change_addr:
 923             change_addr = inputs[0][0]
 924             print "Sending change to", change_addr
 925
 926         outputs = self.choose_tx_outputs( to_address, amount, fee, total, change_addr )
 927         s_inputs = self.sign_inputs( inputs, outputs, password )
 928
 929         tx = filter( raw_tx( s_inputs, outputs ) )
 930         if to_address not in self.addressbook:
 931             self.addressbook.append(to_address)
 932         if label:
 933             tx_hash = Hash(tx.decode('hex') )[::-1].encode('hex')
 934             self.labels[tx_hash] = label
 935
 936         return tx
 937
 938     def sendtx(self, tx):
 939         tx_hash = Hash(tx.decode('hex') )[::-1].encode('hex')
 940         self.tx_event.clear()
 941         self.interface.send([('blockchain.transaction.broadcast', [tx])])
 942         self.tx_event.wait()
 943         out = self.tx_result
 944         if out != tx_hash:
 945             return False, "error: " + out
 946         if self.receipt:
 947             self.receipts[tx_hash] = self.receipt
 948             self.receipt = None
 949         return True, out
 950
 951
 952     def read_alias(self, alias):
 953         # this might not be the right place for this function.
 954         import urllib
 955
 956         m1 = re.match('([\w\-\.]+)@((\w[\w\-]+\.)+[\w\-]+)', alias)
 957         m2 = re.match('((\w[\w\-]+\.)+[\w\-]+)', alias)
 958         if m1:
 959             url = 'http://' + m1.group(2) + '/bitcoin.id/' + m1.group(1)
 960         elif m2:
 961             url = 'http://' + alias + '/bitcoin.id'
 962         else:
 963             return ''
 964         try:
 965             lines = urllib.urlopen(url).readlines()
 966         except:
 967             return ''
 968
 969         # line 0
 970         line = lines[0].strip().split(':')
 971         if len(line) == 1:
 972             auth_name = None
 973             target = signing_addr = line[0]
 974         else:
 975             target, auth_name, signing_addr, signature = line
 976             msg = "alias:%s:%s:%s"%(alias,target,auth_name)
 977             print msg, signature
 978             self.verify_message(signing_addr, signature, msg)
 979
 980         # other lines are signed updates
 981         for line in lines[1:]:
 982             line = line.strip()
 983             if not line: continue
 984             line = line.split(':')
 985             previous = target
 986             print repr(line)
 987             target, signature = line
 988             self.verify_message(previous, signature, "alias:%s:%s"%(alias,target))
 989
 990         if not self.is_valid(target):
 991             raise BaseException("Invalid bitcoin address")
 992
 993         return target, signing_addr, auth_name
 994
 995     def update_password(self, seed, old_password, new_password):
 996         if new_password == '': new_password = None
 997         self.use_encryption = (new_password != None)
 998         self.seed = self.pw_encode( seed, new_password)
 999         for k in self.imported_keys.keys():
1000             a = self.imported_keys[k]
1001             b = self.pw_decode(a, old_password)
1002             c = self.pw_encode(b, new_password)
1003             self.imported_keys[k] = c
1004         self.save()
1005
1006     def get_alias(self, alias, interactive = False, show_message=None, question = None):
1007         try:
1008             target, signing_address, auth_name = self.read_alias(alias)
1009         except BaseException, e:
1010             # raise exception if verify fails (verify the chain)
1011             if interactive:
1012                 show_message("Alias error: " + str(e))
1013             return
1014
1015         print target, signing_address, auth_name
1016
1017         if auth_name is None:
1018             a = self.aliases.get(alias)
1019             if not a:
1020                 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)
1021                 if interactive and question( msg ):
1022                     self.aliases[alias] = (signing_address, target)
1023                 else:
1024                     target = None
1025             else:
1026                 if signing_address != a[0]:
1027                     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
1028                     if interactive and question( msg ):
1029                         self.aliases[alias] = (signing_address, target)
1030                     else:
1031                         target = None
1032         else:
1033             if signing_address not in self.authorities.keys():
1034                 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)
1035                 if interactive and question( msg ):
1036                     self.authorities[signing_address] = auth_name
1037                 else:
1038                     target = None
1039
1040         if target:
1041             self.aliases[alias] = (signing_address, target)
1042
1043         return target
1044
1045
1046     def parse_url(self, url, show_message, question):
1047         o = url[8:].split('?')
1048         address = o[0]
1049         if len(o)>1:
1050             params = o[1].split('&')
1051         else:
1052             params = []
1053
1054         amount = label = message = signature = identity = ''
1055         for p in params:
1056             k,v = p.split('=')
1057             uv = urldecode(v)
1058             if k == 'amount': amount = uv
1059             elif k == 'message': message = uv
1060             elif k == 'label': label = uv
1061             elif k == 'signature':
1062                 identity, signature = uv.split(':')
1063                 url = url.replace('&%s=%s'%(k,v),'')
1064             else:
1065                 print k,v
1066
1067         if label and self.labels.get(address) != label:
1068             if question('Give label "%s" to address %s ?'%(label,address)):
1069                 if address not in self.addressbook and address not in self.all_addresses():
1070                     self.addressbook.append(address)
1071                 self.labels[address] = label
1072
1073         if signature:
1074             if re.match('^(|([\w\-\.]+)@)((\w[\w\-]+\.)+[\w\-]+)$', identity):
1075                 signing_address = self.get_alias(identity, True, show_message, question)
1076             elif self.is_valid(identity):
1077                 signing_address = identity
1078             else:
1079                 signing_address = None
1080             if not signing_address:
1081                 return
1082             try:
1083                 self.verify_message(signing_address, signature, url )
1084                 self.receipt = (signing_address, signature, url)
1085             except:
1086                 show_message('Warning: the URI contains a bad signature.\nThe identity of the recipient cannot be verified.')
1087                 address = amount = label = identity = message = ''
1088
1089         if re.match('^(|([\w\-\.]+)@)((\w[\w\-]+\.)+[\w\-]+)$', address):
1090             payto_address = self.get_alias(address, True, show_message, question)
1091             if payto_address:
1092                 address = address + ' <' + payto_address + '>'
1093
1094         return address, amount, label, message, signature, identity, url
1095
1096
1097     def update(self):
1098         self.interface.poke()
1099         self.up_to_date_event.wait(10000000000)
1100
1101
1102     def start_session(self, interface):
1103         self.interface = interface
1104         self.interface.send([('server.banner',[]), ('blockchain.numblocks.subscribe',[]), ('server.peers.subscribe',[])])
1105         self.interface.subscribe(self.all_addresses())
1106
1107
1108     def freeze(self,addr):
1109         if addr in self.all_addresses() and addr not in self.frozen_addresses:
1110             self.unprioritize(addr)
1111             self.frozen_addresses.append(addr)
1112             self.save()
1113             return True
1114         else:
1115             return False
1116
1117     def unfreeze(self,addr):
1118         if addr in self.all_addresses() and addr in self.frozen_addresses:
1119             self.frozen_addresses.remove(addr)
1120             self.save()
1121             return True
1122         else:
1123             return False
1124
1125     def prioritize(self,addr):
1126         if addr in self.all_addresses() and addr not in self.prioritized_addresses:
1127             self.unfreeze(addr)
1128             self.prioritized_addresses.append(addr)
1129             self.save()
1130             return True
1131         else:
1132             return False
1133
1134     def unprioritize(self,addr):
1135         if addr in self.all_addresses() and addr in self.prioritized_addresses:
1136             self.prioritized_addresses.remove(addr)
1137             self.save()
1138             return True
1139         else:
1140             return False