lib/wallet.py

   1 #!/usr/bin/env python
   2 #
   3 # Electrum - lightweight Bitcoin client
   4 # Copyright (C) 2011 thomasv@gitorious
   5 #
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
  18
  19
  20 import sys, base64, os, re, hashlib, copy, operator, ast, threading, random
  21 import aes, ecdsa
  22 from ecdsa.util import string_to_number, number_to_string
  23
  24 ############ functions from pywallet #####################
  25
  26 addrtype = 0
  27
  28 def hash_160(public_key):
  29     try:
  30         md = hashlib.new('ripemd160')
  31         md.update(hashlib.sha256(public_key).digest())
  32         return md.digest()
  33     except:
  34         import ripemd
  35         md = ripemd.new(hashlib.sha256(public_key).digest())
  36         return md.digest()
  37
  38
  39 def public_key_to_bc_address(public_key):
  40     h160 = hash_160(public_key)
  41     return hash_160_to_bc_address(h160)
  42
  43 def hash_160_to_bc_address(h160):
  44     vh160 = chr(addrtype) + h160
  45     h = Hash(vh160)
  46     addr = vh160 + h[0:4]
  47     return b58encode(addr)
  48
  49 def bc_address_to_hash_160(addr):
  50     bytes = b58decode(addr, 25)
  51     return bytes[1:21]
  52
  53 __b58chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
  54 __b58base = len(__b58chars)
  55
  56 def b58encode(v):
  57     """ encode v, which is a string of bytes, to base58.
  58     """
  59
  60     long_value = 0L
  61     for (i, c) in enumerate(v[::-1]):
  62         long_value += (256**i) * ord(c)
  63
  64     result = ''
  65     while long_value >= __b58base:
  66         div, mod = divmod(long_value, __b58base)
  67         result = __b58chars[mod] + result
  68         long_value = div
  69     result = __b58chars[long_value] + result
  70
  71     # Bitcoin does a little leading-zero-compression:
  72     # leading 0-bytes in the input become leading-1s
  73     nPad = 0
  74     for c in v:
  75         if c == '\0': nPad += 1
  76         else: break
  77
  78     return (__b58chars[0]*nPad) + result
  79
  80 def b58decode(v, length):
  81     """ decode v into a string of len bytes
  82     """
  83     long_value = 0L
  84     for (i, c) in enumerate(v[::-1]):
  85         long_value += __b58chars.find(c) * (__b58base**i)
  86
  87     result = ''
  88     while long_value >= 256:
  89         div, mod = divmod(long_value, 256)
  90         result = chr(mod) + result
  91         long_value = div
  92     result = chr(long_value) + result
  93
  94     nPad = 0
  95     for c in v:
  96         if c == __b58chars[0]: nPad += 1
  97         else: break
  98
  99     result = chr(0)*nPad + result
 100     if length is not None and len(result) != length:
 101         return None
 102
 103     return result
 104
 105
 106 def Hash(data):
 107     return hashlib.sha256(hashlib.sha256(data).digest()).digest()
 108
 109 def EncodeBase58Check(vchIn):
 110     hash = Hash(vchIn)
 111     return b58encode(vchIn + hash[0:4])
 112
 113 def DecodeBase58Check(psz):
 114     vchRet = b58decode(psz, None)
 115     key = vchRet[0:-4]
 116     csum = vchRet[-4:]
 117     hash = Hash(key)
 118     cs32 = hash[0:4]
 119     if cs32 != csum:
 120         return None
 121     else:
 122         return key
 123
 124 def PrivKeyToSecret(privkey):
 125     return privkey[9:9+32]
 126
 127 def SecretToASecret(secret):
 128     vchIn = chr(addrtype+128) + secret
 129     return EncodeBase58Check(vchIn)
 130
 131 def ASecretToSecret(key):
 132     vch = DecodeBase58Check(key)
 133     if vch and vch[0] == chr(addrtype+128):
 134         return vch[1:]
 135     else:
 136         return False
 137
 138 ########### end pywallet functions #######################
 139
 140 # URL decode
 141 _ud = re.compile('%([0-9a-hA-H]{2})', re.MULTILINE)
 142 urldecode = lambda x: _ud.sub(lambda m: chr(int(m.group(1), 16)), x)
 143
 144
 145 def int_to_hex(i, length=1):
 146     s = hex(i)[2:].rstrip('L')
 147     s = "0"*(2*length - len(s)) + s
 148     return s.decode('hex')[::-1].encode('hex')
 149
 150
 151 # AES
 152 EncodeAES = lambda secret, s: base64.b64encode(aes.encryptData(secret,s))
 153 DecodeAES = lambda secret, e: aes.decryptData(secret, base64.b64decode(e))
 154
 155
 156
 157 # secp256k1, http://www.oid-info.com/get/1.3.132.0.10
 158 _p = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2FL
 159 _r = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141L
 160 _b = 0x0000000000000000000000000000000000000000000000000000000000000007L
 161 _a = 0x0000000000000000000000000000000000000000000000000000000000000000L
 162 _Gx = 0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798L
 163 _Gy = 0x483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8L
 164 curve_secp256k1 = ecdsa.ellipticcurve.CurveFp( _p, _a, _b )
 165 generator_secp256k1 = ecdsa.ellipticcurve.Point( curve_secp256k1, _Gx, _Gy, _r )
 166 oid_secp256k1 = (1,3,132,0,10)
 167 SECP256k1 = ecdsa.curves.Curve("SECP256k1", curve_secp256k1, generator_secp256k1, oid_secp256k1 )
 168
 169
 170 def filter(s):
 171     out = re.sub('( [^\n]*|)\n','',s)
 172     out = out.replace(' ','')
 173     out = out.replace('\n','')
 174     return out
 175
 176 def raw_tx( inputs, outputs, for_sig = None ):
 177     s  = int_to_hex(1,4)                                     +   '     version\n'
 178     s += int_to_hex( len(inputs) )                           +   '     number of inputs\n'
 179     for i in range(len(inputs)):
 180         _, _, p_hash, p_index, p_script, pubkey, sig = inputs[i]
 181         s += p_hash.decode('hex')[::-1].encode('hex')        +  '     prev hash\n'
 182         s += int_to_hex(p_index,4)                           +  '     prev index\n'
 183         if for_sig is None:
 184             sig = sig + chr(1)                               # hashtype
 185             script  = int_to_hex( len(sig))                  +  '     push %d bytes\n'%len(sig)
 186             script += sig.encode('hex')                      +  '     sig\n'
 187             pubkey = chr(4) + pubkey
 188             script += int_to_hex( len(pubkey))               +  '     push %d bytes\n'%len(pubkey)
 189             script += pubkey.encode('hex')                   +  '     pubkey\n'
 190         elif for_sig==i:
 191             script = p_script                                +  '     scriptsig \n'
 192         else:
 193             script=''
 194         s += int_to_hex( len(filter(script))/2 )             +  '     script length \n'
 195         s += script
 196         s += "ffffffff"                                      +  '     sequence\n'
 197     s += int_to_hex( len(outputs) )                          +  '     number of outputs\n'
 198     for output in outputs:
 199         addr, amount = output
 200         s += int_to_hex( amount, 8)                          +  '     amount: %d\n'%amount
 201         script = '76a9'                                      # op_dup, op_hash_160
 202         script += '14'                                       # push 0x14 bytes
 203         script += bc_address_to_hash_160(addr).encode('hex')
 204         script += '88ac'                                     # op_equalverify, op_checksig
 205         s += int_to_hex( len(filter(script))/2 )             +  '     script length \n'
 206         s += script                                          +  '     script \n'
 207     s += int_to_hex(0,4)                                     # lock time
 208     if for_sig is not None: s += int_to_hex(1, 4)            # hash type
 209     return s
 210
 211
 212
 213
 214 def format_satoshis(x, is_diff=False, num_zeros = 0):
 215     from decimal import Decimal
 216     s = Decimal(x)
 217     sign, digits, exp = s.as_tuple()
 218     digits = map(str, digits)
 219     while len(digits) < 9:
 220         digits.insert(0,'0')
 221     digits.insert(-8,'.')
 222     s = ''.join(digits).rstrip('0')
 223     if sign:
 224         s = '-' + s
 225     elif is_diff:
 226         s = "+" + s
 227
 228     p = s.find('.')
 229     s += "0"*( 1 + num_zeros - ( len(s) - p ))
 230     s += " "*( 9 - ( len(s) - p ))
 231     s = " "*( 5 - ( p )) + s
 232     return s
 233
 234
 235 from version import ELECTRUM_VERSION, SEED_VERSION
 236 from interface import DEFAULT_SERVERS
 237
 238
 239
 240
 241 class Wallet:
 242     def __init__(self, gui_callback = lambda: None):
 243
 244         self.electrum_version = ELECTRUM_VERSION
 245         self.seed_version = SEED_VERSION
 246         self.gui_callback = gui_callback
 247
 248         self.gap_limit = 5           # configuration
 249         self.fee = 100000
 250         self.num_zeros = 0
 251         self.master_public_key = ''
 252
 253         # saved fields
 254         self.use_encryption = False
 255         self.addresses = []          # receiving addresses visible for user
 256         self.change_addresses = []   # addresses used as change
 257         self.seed = ''               # encrypted
 258         self.history = {}
 259         self.labels = {}             # labels for addresses and transactions
 260         self.aliases = {}            # aliases for addresses
 261         self.authorities = {}        # trusted addresses
 262         self.frozen_addresses = []
 263         self.prioritized_addresses = []
 264
 265         self.receipts = {}           # signed URIs
 266         self.receipt = None          # next receipt
 267         self.addressbook = []        # outgoing addresses, for payments
 268
 269         # not saved
 270         self.tx_history = {}
 271
 272         self.imported_keys = {}
 273         self.remote_url = None
 274
 275         self.was_updated = True
 276         self.blocks = -1
 277         self.banner = ''
 278
 279         # there is a difference between self.up_to_date and self.is_up_to_date()
 280         # self.is_up_to_date() returns true when all requests have been answered and processed
 281         # self.up_to_date is true when the wallet is synchronized (stronger requirement)
 282         self.up_to_date_event = threading.Event()
 283         self.up_to_date_event.clear()
 284         self.up_to_date = False
 285         self.lock = threading.Lock()
 286         self.tx_event = threading.Event()
 287
 288         self.pick_random_server()
 289
 290
 291
 292     def pick_random_server(self):
 293         self.server = random.choice( DEFAULT_SERVERS )         # random choice when the wallet is created
 294
 295     def is_up_to_date(self):
 296         return self.interface.responses.empty() and not self.interface.unanswered_requests
 297
 298     def set_server(self, server):
 299         # raise an error if the format isnt correct
 300         a,b,c = server.split(':')
 301         b = int(b)
 302         assert c in ['t','h','n']
 303         # set the server
 304         if server != self.server:
 305             self.server = server
 306             self.save()
 307             self.interface.is_connected = False  # this exits the polling loop
 308             self.interface.poke()
 309
 310     def set_path(self, wallet_path):
 311
 312         if wallet_path is not None:
 313             self.path = wallet_path
 314         else:
 315             # backward compatibility: look for wallet file in the default data directory
 316             if "HOME" in os.environ:
 317                 wallet_dir = os.path.join( os.environ["HOME"], '.electrum')
 318             elif "LOCALAPPDATA" in os.environ:
 319                 wallet_dir = os.path.join( os.environ["LOCALAPPDATA"], 'Electrum' )
 320             elif "APPDATA" in os.environ:
 321                 wallet_dir = os.path.join( os.environ["APPDATA"], 'Electrum' )
 322             else:
 323                 raise BaseException("No home directory found in environment variables.")
 324
 325             if not os.path.exists( wallet_dir ): os.mkdir( wallet_dir )
 326             self.path = os.path.join( wallet_dir, 'electrum.dat' )
 327
 328     def import_key(self, keypair, password):
 329         address, key = keypair.split(':')
 330         if not self.is_valid(address):
 331             raise BaseException('Invalid Bitcoin address')
 332         if address in self.all_addresses():
 333             raise BaseException('Address already in wallet')
 334         b = ASecretToSecret( key )
 335         if not b: return False
 336         secexp = int( b.encode('hex'), 16)
 337         private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve=SECP256k1 )
 338         # sanity check
 339         public_key = private_key.get_verifying_key()
 340         if not address == public_key_to_bc_address( '04'.decode('hex') + public_key.to_string() ):
 341             raise BaseException('Address does not match private key')
 342         self.imported_keys[address] = self.pw_encode( key, password )
 343
 344     def new_seed(self, password):
 345         seed = "%032x"%ecdsa.util.randrange( pow(2,128) )
 346         #self.init_mpk(seed)
 347         # encrypt
 348         self.seed = self.pw_encode( seed, password )
 349
 350
 351     def init_mpk(self,seed):
 352         # public key
 353         curve = SECP256k1
 354         secexp = self.stretch_key(seed)
 355         master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 356         self.master_public_key = master_private_key.get_verifying_key().to_string()
 357
 358     def all_addresses(self):
 359         return self.addresses + self.change_addresses + self.imported_keys.keys()
 360
 361     def is_mine(self, address):
 362         return address in self.all_addresses()
 363
 364     def is_change(self, address):
 365         return address in self.change_addresses
 366
 367     def is_valid(self,addr):
 368         ADDRESS_RE = re.compile('[1-9A-HJ-NP-Za-km-z]{26,}\\Z')
 369         if not ADDRESS_RE.match(addr): return False
 370         try:
 371             h = bc_address_to_hash_160(addr)
 372         except:
 373             return False
 374         return addr == hash_160_to_bc_address(h)
 375
 376     def stretch_key(self,seed):
 377         oldseed = seed
 378         for i in range(100000):
 379             seed = hashlib.sha256(seed + oldseed).digest()
 380         return string_to_number( seed )
 381
 382     def get_sequence(self,n,for_change):
 383         return string_to_number( Hash( "%d:%d:"%(n,for_change) + self.master_public_key ) )
 384
 385     def get_private_key_base58(self, address, password):
 386         pk = self.get_private_key(address, password)
 387         if pk is None: return None
 388         return SecretToASecret( pk )
 389
 390     def get_private_key(self, address, password):
 391         """  Privatekey(type,n) = Master_private_key + H(n|S|type)  """
 392         order = generator_secp256k1.order()
 393
 394         if address in self.imported_keys.keys():
 395             b = self.pw_decode( self.imported_keys[address], password )
 396             if not b: return None
 397             b = ASecretToSecret( b )
 398             secexp = int( b.encode('hex'), 16)
 399         else:
 400             if address in self.addresses:
 401                 n = self.addresses.index(address)
 402                 for_change = False
 403             elif address in self.change_addresses:
 404                 n = self.change_addresses.index(address)
 405                 for_change = True
 406             else:
 407                 raise BaseException("unknown address")
 408             try:
 409                 seed = self.pw_decode( self.seed, password)
 410             except:
 411                 raise BaseException("Invalid password")
 412             if not seed: return None
 413             secexp = self.stretch_key(seed)
 414             secexp = ( secexp + self.get_sequence(n,for_change) ) % order
 415
 416         pk = number_to_string(secexp,order)
 417         return pk
 418
 419     def msg_magic(self, message):
 420         return "\x18Bitcoin Signed Message:\n" + chr( len(message) ) + message
 421
 422     def sign_message(self, address, message, password):
 423         private_key = ecdsa.SigningKey.from_string( self.get_private_key(address, password), curve = SECP256k1 )
 424         public_key = private_key.get_verifying_key()
 425         signature = private_key.sign_digest( Hash( self.msg_magic( message ) ), sigencode = ecdsa.util.sigencode_string )
 426         assert public_key.verify_digest( signature, Hash( self.msg_magic( message ) ), sigdecode = ecdsa.util.sigdecode_string)
 427         for i in range(4):
 428             sig = base64.b64encode( chr(27+i) + signature )
 429             try:
 430                 self.verify_message( address, sig, message)
 431                 return sig
 432             except:
 433                 continue
 434         else:
 435             raise BaseException("error: cannot sign message")
 436
 437
 438     def verify_message(self, address, signature, message):
 439         """ See http://www.secg.org/download/aid-780/sec1-v2.pdf for the math """
 440         from ecdsa import numbertheory, ellipticcurve, util
 441         import msqr
 442         curve = curve_secp256k1
 443         G = generator_secp256k1
 444         order = G.order()
 445         # extract r,s from signature
 446         sig = base64.b64decode(signature)
 447         if len(sig) != 65: raise BaseException("Wrong encoding")
 448         r,s = util.sigdecode_string(sig[1:], order)
 449         recid = ord(sig[0]) - 27
 450         # 1.1
 451         x = r + (recid/2) * order
 452         # 1.3
 453         alpha = ( x * x * x  + curve.a() * x + curve.b() ) % curve.p()
 454         beta = msqr.modular_sqrt(alpha, curve.p())
 455         y = beta if (beta - recid) % 2 == 0 else curve.p() - beta
 456         # 1.4 the constructor checks that nR is at infinity
 457         R = ellipticcurve.Point(curve, x, y, order)
 458         # 1.5 compute e from message:
 459         h = Hash( self.msg_magic( message ) )
 460         e = string_to_number(h)
 461         minus_e = -e % order
 462         # 1.6 compute Q = r^-1 (sR - eG)
 463         inv_r = numbertheory.inverse_mod(r,order)
 464         Q = inv_r * ( s * R + minus_e * G )
 465         public_key = ecdsa.VerifyingKey.from_public_point( Q, curve = SECP256k1 )
 466         # check that Q is the public key
 467         public_key.verify_digest( sig[1:], h, sigdecode = ecdsa.util.sigdecode_string)
 468         # check that we get the original signing address
 469         addr = public_key_to_bc_address( '04'.decode('hex') + public_key.to_string() )
 470         # print addr
 471         if address != addr:
 472             print "bad signature"
 473             raise BaseException("Bad signature")
 474
 475
 476     def create_new_address(self, for_change):
 477         """   Publickey(type,n) = Master_public_key + H(n|S|type)*point  """
 478         curve = SECP256k1
 479         n = len(self.change_addresses) if for_change else len(self.addresses)
 480         z = self.get_sequence(n,for_change)
 481         master_public_key = ecdsa.VerifyingKey.from_string( self.master_public_key, curve = SECP256k1 )
 482         pubkey_point = master_public_key.pubkey.point + z*curve.generator
 483         public_key2 = ecdsa.VerifyingKey.from_public_point( pubkey_point, curve = SECP256k1 )
 484         address = public_key_to_bc_address( '04'.decode('hex') + public_key2.to_string() )
 485         if for_change:
 486             self.change_addresses.append(address)
 487         else:
 488             self.addresses.append(address)
 489
 490         self.history[address] = []
 491         print address
 492         return address
 493
 494
 495
 496     def synchronize(self):
 497         if not self.master_public_key:
 498             return []
 499
 500         new_addresses = []
 501         while True:
 502             if self.change_addresses == []:
 503                 new_addresses.append( self.create_new_address(True) )
 504                 continue
 505             a = self.change_addresses[-1]
 506             if self.history.get(a):
 507                 new_addresses.append( self.create_new_address(True) )
 508             else:
 509                 break
 510
 511         n = self.gap_limit
 512         while True:
 513             if len(self.addresses) < n:
 514                 new_addresses.append( self.create_new_address(False) )
 515                 continue
 516             if map( lambda a: self.history.get(a), self.addresses[-n:] ) == n*[[]]:
 517                 break
 518             else:
 519                 new_addresses.append( self.create_new_address(False) )
 520
 521         if self.remote_url:
 522             num = self.get_remote_number()
 523             while len(self.addresses)<num:
 524                 new_addresses.append( self.create_new_address(False) )
 525
 526         return new_addresses
 527
 528
 529     def get_remote_number(self):
 530         import jsonrpclib
 531         server = jsonrpclib.Server(self.remote_url)
 532         out = server.getnum()
 533         return out
 534
 535     def get_remote_mpk(self):
 536         import jsonrpclib
 537         server = jsonrpclib.Server(self.remote_url)
 538         out = server.getkey()
 539         return out
 540
 541     def is_found(self):
 542         return (len(self.change_addresses) > 1 ) or ( len(self.addresses) > self.gap_limit )
 543
 544     def fill_addressbook(self):
 545         for tx in self.tx_history.values():
 546             if tx['value']<0:
 547                 for i in tx['outputs']:
 548                     if not self.is_mine(i) and i not in self.addressbook:
 549                         self.addressbook.append(i)
 550         # redo labels
 551         self.update_tx_labels()
 552
 553
 554     def save(self):
 555         s = {
 556             'seed_version':self.seed_version,
 557             'use_encryption':self.use_encryption,
 558             'master_public_key': self.master_public_key.encode('hex'),
 559             'fee':self.fee,
 560             'server':self.server,
 561             'seed':self.seed,
 562             'addresses':self.addresses,
 563             'change_addresses':self.change_addresses,
 564             'history':self.history,
 565             'labels':self.labels,
 566             'contacts':self.addressbook,
 567             'imported_keys':self.imported_keys,
 568             'aliases':self.aliases,
 569             'authorities':self.authorities,
 570             'receipts':self.receipts,
 571             'num_zeros':self.num_zeros,
 572             'frozen_addresses':self.frozen_addresses,
 573             'prioritized_addresses':self.prioritized_addresses,
 574             }
 575         f = open(self.path,"w")
 576         f.write( repr(s) )
 577         f.close()
 578
 579     def read(self):
 580         import interface
 581
 582         upgrade_msg = """This wallet seed is deprecated. Please run upgrade.py for a diagnostic."""
 583         self.file_exists = False
 584         try:
 585             f = open(self.path,"r")
 586             data = f.read()
 587             f.close()
 588         except:
 589             return
 590         data = interface.old_to_new(data)
 591         try:
 592             d = ast.literal_eval( data )
 593             self.seed_version = d.get('seed_version')
 594             self.master_public_key = d.get('master_public_key').decode('hex')
 595             self.use_encryption = d.get('use_encryption')
 596             self.fee = int( d.get('fee') )
 597             self.seed = d.get('seed')
 598             self.server = d.get('server')
 599             #blocks = d.get('blocks')
 600             self.addresses = d.get('addresses')
 601             self.change_addresses = d.get('change_addresses')
 602             self.history = d.get('history')
 603             self.labels = d.get('labels')
 604             self.addressbook = d.get('contacts')
 605             self.imported_keys = d.get('imported_keys',{})
 606             self.aliases = d.get('aliases',{})
 607             self.authorities = d.get('authorities',{})
 608             self.receipts = d.get('receipts',{})
 609             self.num_zeros = d.get('num_zeros',0)
 610             self.frozen_addresses = d.get('frozen_addresses',[])
 611             self.prioritized_addresses = d.get('prioritized_addresses',[])
 612         except:
 613             raise BaseException("cannot read wallet file")
 614
 615         self.update_tx_history()
 616
 617         if self.seed_version != SEED_VERSION:
 618             raise BaseException(upgrade_msg)
 619
 620         if self.remote_url: assert self.master_public_key.encode('hex') == self.get_remote_mpk()
 621
 622         self.file_exists = True
 623
 624
 625
 626
 627     def get_addr_balance(self, addr):
 628         assert self.is_mine(addr)
 629         h = self.history.get(addr,[])
 630         c = u = 0
 631         for item in h:
 632             v = item['value']
 633             if item['height']:
 634                 c += v
 635             else:
 636                 u += v
 637         return c, u
 638
 639     def get_balance(self):
 640         conf = unconf = 0
 641         for addr in self.all_addresses():
 642             c, u = self.get_addr_balance(addr)
 643             conf += c
 644             unconf += u
 645         return conf, unconf
 646
 647
 648     def choose_tx_inputs( self, amount, fixed_fee, from_addr = None ):
 649         """ todo: minimize tx size """
 650         total = 0
 651         fee = self.fee if fixed_fee is None else fixed_fee
 652
 653         coins = []
 654         prioritized_coins = []
 655         domain = [from_addr] if from_addr else self.all_addresses()
 656         for i in self.frozen_addresses:
 657             if i in domain: domain.remove(i)
 658
 659         for i in self.prioritized_addresses:
 660             if i in domain: domain.remove(i)
 661
 662         for addr in domain:
 663             h = self.history.get(addr)
 664             if h is None: continue
 665             for item in h:
 666                 if item.get('raw_output_script'):
 667                     coins.append( (addr,item))
 668
 669         coins = sorted( coins, key = lambda x: x[1]['timestamp'] )
 670
 671         for addr in prioritized_addresses:
 672             h = self.history.get(addr)
 673             if h is None: continue
 674             for item in h:
 675                 if item.get('raw_output_script'):
 676                     prioritized_coins.append( (addr,item))
 677
 678         prioritized_coins = sorted( prioritized_coins, key = lambda x: x[1]['timestamp'] )
 679
 680         inputs = []
 681         coins = prioritized_coins + coins
 682
 683         for c in coins:
 684             addr, item = c
 685             v = item.get('value')
 686             total += v
 687             inputs.append((addr, v, item['tx_hash'], item['index'], item['raw_output_script'], None, None) )
 688             fee = self.fee*len(inputs) if fixed_fee is None else fixed_fee
 689             if total >= amount + fee: break
 690         else:
 691             #print "not enough funds: %d %d"%(total, fee)
 692             inputs = []
 693         return inputs, total, fee
 694
 695     def choose_tx_outputs( self, to_addr, amount, fee, total, change_addr=None ):
 696         outputs = [ (to_addr, amount) ]
 697         change_amount = total - ( amount + fee )
 698         if change_amount != 0:
 699             # normally, the update thread should ensure that the last change address is unused
 700             if not change_addr:
 701                 change_addr = self.change_addresses[-1]
 702             outputs.append( ( change_addr,  change_amount) )
 703         return outputs
 704
 705     def sign_inputs( self, inputs, outputs, password ):
 706         s_inputs = []
 707         for i in range(len(inputs)):
 708             addr, v, p_hash, p_pos, p_scriptPubKey, _, _ = inputs[i]
 709             private_key = ecdsa.SigningKey.from_string( self.get_private_key(addr, password), curve = SECP256k1 )
 710             public_key = private_key.get_verifying_key()
 711             pubkey = public_key.to_string()
 712             tx = filter( raw_tx( inputs, outputs, for_sig = i ) )
 713             sig = private_key.sign_digest( Hash( tx.decode('hex') ), sigencode = ecdsa.util.sigencode_der )
 714             assert public_key.verify_digest( sig, Hash( tx.decode('hex') ), sigdecode = ecdsa.util.sigdecode_der)
 715             s_inputs.append( (addr, v, p_hash, p_pos, p_scriptPubKey, pubkey, sig) )
 716         return s_inputs
 717
 718     def pw_encode(self, s, password):
 719         if password:
 720             secret = Hash(password)
 721             return EncodeAES(secret, s)
 722         else:
 723             return s
 724
 725     def pw_decode(self, s, password):
 726         if password is not None:
 727             secret = Hash(password)
 728             d = DecodeAES(secret, s)
 729             if s == self.seed:
 730                 try:
 731                     d.decode('hex')
 732                 except:
 733                     raise BaseException("Invalid password")
 734             return d
 735         else:
 736             return s
 737
 738     def get_status(self, address):
 739         h = self.history.get(address)
 740         if not h:
 741             status = None
 742         else:
 743             lastpoint = h[-1]
 744             status = lastpoint['block_hash']
 745             if status == 'mempool':
 746                 status = status + ':%d'% len(h)
 747         return status
 748
 749     def receive_status_callback(self, addr, status):
 750         with self.lock:
 751             if self.get_status(addr) != status:
 752                 #print "updating status for", addr, status
 753                 self.interface.get_history(addr)
 754
 755     def receive_history_callback(self, addr, data):
 756         #print "updating history for", addr
 757         with self.lock:
 758             self.history[addr] = data
 759             self.update_tx_history()
 760             self.save()
 761
 762     def get_tx_history(self):
 763         lines = self.tx_history.values()
 764         lines = sorted(lines, key=operator.itemgetter("timestamp"))
 765         return lines
 766
 767     def update_tx_history(self):
 768         self.tx_history= {}
 769         for addr in self.all_addresses():
 770             h = self.history.get(addr)
 771             if h is None: continue
 772             for tx in h:
 773                 tx_hash = tx['tx_hash']
 774                 line = self.tx_history.get(tx_hash)
 775                 if not line:
 776                     self.tx_history[tx_hash] = copy.copy(tx)
 777                     line = self.tx_history.get(tx_hash)
 778                 else:
 779                     line['value'] += tx['value']
 780                 if line['height'] == 0:
 781                     line['timestamp'] = 1e12
 782         self.update_tx_labels()
 783
 784     def update_tx_labels(self):
 785         for tx in self.tx_history.values():
 786             default_label = ''
 787             if tx['value']<0:
 788                 for o_addr in tx['outputs']:
 789                     if not self.is_change(o_addr):
 790                         dest_label = self.labels.get(o_addr)
 791                         if dest_label:
 792                             default_label = 'to: ' + dest_label
 793                         else:
 794                             default_label = 'to: ' + o_addr
 795             else:
 796                 for o_addr in tx['outputs']:
 797                     if self.is_mine(o_addr) and not self.is_change(o_addr):
 798                         break
 799                 else:
 800                     for o_addr in tx['outputs']:
 801                         if self.is_mine(o_addr):
 802                             break
 803                     else:
 804                         o_addr = None
 805
 806                 if o_addr:
 807                     dest_label = self.labels.get(o_addr)
 808                     if dest_label:
 809                         default_label = 'at: ' + dest_label
 810                     else:
 811                         default_label = 'at: ' + o_addr
 812
 813             tx['default_label'] = default_label
 814
 815     def mktx(self, to_address, amount, label, password, fee=None, change_addr=None, from_addr= None):
 816         if not self.is_valid(to_address):
 817             raise BaseException("Invalid address")
 818         inputs, total, fee = self.choose_tx_inputs( amount, fee, from_addr )
 819         if not inputs:
 820             raise BaseException("Not enough funds")
 821         outputs = self.choose_tx_outputs( to_address, amount, fee, total, change_addr )
 822         s_inputs = self.sign_inputs( inputs, outputs, password )
 823
 824         tx = filter( raw_tx( s_inputs, outputs ) )
 825         if to_address not in self.addressbook:
 826             self.addressbook.append(to_address)
 827         if label:
 828             tx_hash = Hash(tx.decode('hex') )[::-1].encode('hex')
 829             self.labels[tx_hash] = label
 830
 831         return tx
 832
 833     def sendtx(self, tx):
 834         tx_hash = Hash(tx.decode('hex') )[::-1].encode('hex')
 835         self.tx_event.clear()
 836         self.interface.send([('blockchain.transaction.broadcast', [tx])])
 837         self.tx_event.wait()
 838         out = self.tx_result
 839         if out != tx_hash:
 840             return False, "error: " + out
 841         if self.receipt:
 842             self.receipts[tx_hash] = self.receipt
 843             self.receipt = None
 844         return True, out
 845
 846
 847     def read_alias(self, alias):
 848         # this might not be the right place for this function.
 849         import urllib
 850
 851         m1 = re.match('([\w\-\.]+)@((\w[\w\-]+\.)+[\w\-]+)', alias)
 852         m2 = re.match('((\w[\w\-]+\.)+[\w\-]+)', alias)
 853         if m1:
 854             url = 'http://' + m1.group(2) + '/bitcoin.id/' + m1.group(1)
 855         elif m2:
 856             url = 'http://' + alias + '/bitcoin.id'
 857         else:
 858             return ''
 859         try:
 860             lines = urllib.urlopen(url).readlines()
 861         except:
 862             return ''
 863
 864         # line 0
 865         line = lines[0].strip().split(':')
 866         if len(line) == 1:
 867             auth_name = None
 868             target = signing_addr = line[0]
 869         else:
 870             target, auth_name, signing_addr, signature = line
 871             msg = "alias:%s:%s:%s"%(alias,target,auth_name)
 872             print msg, signature
 873             self.verify_message(signing_addr, signature, msg)
 874
 875         # other lines are signed updates
 876         for line in lines[1:]:
 877             line = line.strip()
 878             if not line: continue
 879             line = line.split(':')
 880             previous = target
 881             print repr(line)
 882             target, signature = line
 883             self.verify_message(previous, signature, "alias:%s:%s"%(alias,target))
 884
 885         if not self.is_valid(target):
 886             raise BaseException("Invalid bitcoin address")
 887
 888         return target, signing_addr, auth_name
 889
 890     def update_password(self, seed, old_password, new_password):
 891         if new_password == '': new_password = None
 892         self.use_encryption = (new_password != None)
 893         self.seed = self.pw_encode( seed, new_password)
 894         for k in self.imported_keys.keys():
 895             a = self.imported_keys[k]
 896             b = self.pw_decode(a, old_password)
 897             c = self.pw_encode(b, new_password)
 898             self.imported_keys[k] = c
 899         self.save()
 900
 901     def get_alias(self, alias, interactive = False, show_message=None, question = None):
 902         try:
 903             target, signing_address, auth_name = self.read_alias(alias)
 904         except BaseException, e:
 905             # raise exception if verify fails (verify the chain)
 906             if interactive:
 907                 show_message("Alias error: " + str(e))
 908             return
 909
 910         print target, signing_address, auth_name
 911
 912         if auth_name is None:
 913             a = self.aliases.get(alias)
 914             if not a:
 915                 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)
 916                 if interactive and question( msg ):
 917                     self.aliases[alias] = (signing_address, target)
 918                 else:
 919                     target = None
 920             else:
 921                 if signing_address != a[0]:
 922                     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
 923                     if interactive and question( msg ):
 924                         self.aliases[alias] = (signing_address, target)
 925                     else:
 926                         target = None
 927         else:
 928             if signing_address not in self.authorities.keys():
 929                 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)
 930                 if interactive and question( msg ):
 931                     self.authorities[signing_address] = auth_name
 932                 else:
 933                     target = None
 934
 935         if target:
 936             self.aliases[alias] = (signing_address, target)
 937
 938         return target
 939
 940
 941     def parse_url(self, url, show_message, question):
 942         o = url[8:].split('?')
 943         address = o[0]
 944         if len(o)>1:
 945             params = o[1].split('&')
 946         else:
 947             params = []
 948
 949         amount = label = message = signature = identity = ''
 950         for p in params:
 951             k,v = p.split('=')
 952             uv = urldecode(v)
 953             if k == 'amount': amount = uv
 954             elif k == 'message': message = uv
 955             elif k == 'label': label = uv
 956             elif k == 'signature':
 957                 identity, signature = uv.split(':')
 958                 url = url.replace('&%s=%s'%(k,v),'')
 959             else:
 960                 print k,v
 961
 962         if signature:
 963             if re.match('^(|([\w\-\.]+)@)((\w[\w\-]+\.)+[\w\-]+)$', identity):
 964                 signing_address = self.get_alias(identity, True, show_message, question)
 965             elif self.is_valid(identity):
 966                 signing_address = identity
 967             else:
 968                 signing_address = None
 969             if not signing_address:
 970                 return
 971             try:
 972                 self.verify_message(signing_address, signature, url )
 973                 self.receipt = (signing_address, signature, url)
 974             except:
 975                 show_message('Warning: the URI contains a bad signature.\nThe identity of the recipient cannot be verified.')
 976                 address = amount = label = identity = message = ''
 977
 978         if re.match('^(|([\w\-\.]+)@)((\w[\w\-]+\.)+[\w\-]+)$', address):
 979             payto_address = self.get_alias(address, True, show_message, question)
 980             if payto_address:
 981                 address = address + ' <' + payto_address + '>'
 982
 983         return address, amount, label, message, signature, identity, url
 984
 985
 986     def update(self):
 987         self.interface.poke()
 988         self.up_to_date_event.wait(10000000000)
 989
 990
 991     def start_session(self, interface):
 992         self.interface = interface
 993         self.interface.send([('server.banner',[]), ('blockchain.numblocks.subscribe',[]), ('server.peers.subscribe',[])])
 994         self.interface.subscribe(self.all_addresses())
 995
 996
 997
 998