lib/bitcoin.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 hashlib, base64, ecdsa, re
  21
  22
  23 def rev_hex(s):
  24     return s.decode('hex')[::-1].encode('hex')
  25
  26 def int_to_hex(i, length=1):
  27     s = hex(i)[2:].rstrip('L')
  28     s = "0"*(2*length - len(s)) + s
  29     return rev_hex(s)
  30
  31 def var_int(i):
  32     # https://en.bitcoin.it/wiki/Protocol_specification#Variable_length_integer
  33     if i<0xfd:
  34         return int_to_hex(i)
  35     elif i<=0xffff:
  36         return "fd"+int_to_hex(i,2)
  37     elif i<=0xffffffff:
  38         return "fe"+int_to_hex(i,4)
  39     else:
  40         return "ff"+int_to_hex(i,8)
  41
  42 def op_push(i):
  43     if i<0x4c:
  44         return int_to_hex(i)
  45     elif i<0xff:
  46         return '4c' + int_to_hex(i)
  47     elif i<0xffff:
  48         return '4d' + int_to_hex(i,2)
  49     else:
  50         return '4e' + int_to_hex(i,4)
  51
  52
  53
  54 Hash = lambda x: hashlib.sha256(hashlib.sha256(x).digest()).digest()
  55 hash_encode = lambda x: x[::-1].encode('hex')
  56 hash_decode = lambda x: x.decode('hex')[::-1]
  57
  58
  59 # pywallet openssl private key implementation
  60
  61 def i2d_ECPrivateKey(pkey, compressed=False):
  62     if compressed:
  63         key = '3081d30201010420' + \
  64               '%064x' % pkey.secret + \
  65               'a081a53081a2020101302c06072a8648ce3d0101022100' + \
  66               '%064x' % _p + \
  67               '3006040100040107042102' + \
  68               '%064x' % _Gx + \
  69               '022100' + \
  70               '%064x' % _r + \
  71               '020101a124032200'
  72     else:
  73         key = '308201130201010420' + \
  74               '%064x' % pkey.secret + \
  75               'a081a53081a2020101302c06072a8648ce3d0101022100' + \
  76               '%064x' % _p + \
  77               '3006040100040107044104' + \
  78               '%064x' % _Gx + \
  79               '%064x' % _Gy + \
  80               '022100' + \
  81               '%064x' % _r + \
  82               '020101a144034200'
  83
  84     return key.decode('hex') + i2o_ECPublicKey(pkey.pubkey, compressed)
  85
  86 def i2o_ECPublicKey(pubkey, compressed=False):
  87     # public keys are 65 bytes long (520 bits)
  88     # 0x04 + 32-byte X-coordinate + 32-byte Y-coordinate
  89     # 0x00 = point at infinity, 0x02 and 0x03 = compressed, 0x04 = uncompressed
  90     # compressed keys: <sign> <x> where <sign> is 0x02 if y is even and 0x03 if y is odd
  91     if compressed:
  92         if pubkey.point.y() & 1:
  93             key = '03' + '%064x' % pubkey.point.x()
  94         else:
  95             key = '02' + '%064x' % pubkey.point.x()
  96     else:
  97         key = '04' + \
  98               '%064x' % pubkey.point.x() + \
  99               '%064x' % pubkey.point.y()
 100
 101     return key.decode('hex')
 102
 103 # end pywallet openssl private key implementation
 104
 105
 106
 107 ############ functions from pywallet #####################
 108
 109 def hash_160(public_key):
 110     try:
 111         md = hashlib.new('ripemd160')
 112         md.update(hashlib.sha256(public_key).digest())
 113         return md.digest()
 114     except:
 115         import ripemd
 116         md = ripemd.new(hashlib.sha256(public_key).digest())
 117         return md.digest()
 118
 119
 120 def public_key_to_bc_address(public_key):
 121     h160 = hash_160(public_key)
 122     return hash_160_to_bc_address(h160)
 123
 124 def hash_160_to_bc_address(h160, addrtype = 0):
 125     vh160 = chr(addrtype) + h160
 126     h = Hash(vh160)
 127     addr = vh160 + h[0:4]
 128     return b58encode(addr)
 129
 130 def bc_address_to_hash_160(addr):
 131     bytes = b58decode(addr, 25)
 132     return ord(bytes[0]), bytes[1:21]
 133
 134 def encode_point(pubkey, compressed=False):
 135     order = generator_secp256k1.order()
 136     p = pubkey.pubkey.point
 137     x_str = ecdsa.util.number_to_string(p.x(), order)
 138     y_str = ecdsa.util.number_to_string(p.y(), order)
 139     if compressed:
 140         return chr(2 + (p.y() & 1)) + x_str
 141     else:
 142         return chr(4) + pubkey.to_string() #x_str + y_str
 143
 144 __b58chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
 145 __b58base = len(__b58chars)
 146
 147 def b58encode(v):
 148     """ encode v, which is a string of bytes, to base58."""
 149
 150     long_value = 0L
 151     for (i, c) in enumerate(v[::-1]):
 152         long_value += (256**i) * ord(c)
 153
 154     result = ''
 155     while long_value >= __b58base:
 156         div, mod = divmod(long_value, __b58base)
 157         result = __b58chars[mod] + result
 158         long_value = div
 159     result = __b58chars[long_value] + result
 160
 161     # Bitcoin does a little leading-zero-compression:
 162     # leading 0-bytes in the input become leading-1s
 163     nPad = 0
 164     for c in v:
 165         if c == '\0': nPad += 1
 166         else: break
 167
 168     return (__b58chars[0]*nPad) + result
 169
 170 def b58decode(v, length):
 171     """ decode v into a string of len bytes."""
 172     long_value = 0L
 173     for (i, c) in enumerate(v[::-1]):
 174         long_value += __b58chars.find(c) * (__b58base**i)
 175
 176     result = ''
 177     while long_value >= 256:
 178         div, mod = divmod(long_value, 256)
 179         result = chr(mod) + result
 180         long_value = div
 181     result = chr(long_value) + result
 182
 183     nPad = 0
 184     for c in v:
 185         if c == __b58chars[0]: nPad += 1
 186         else: break
 187
 188     result = chr(0)*nPad + result
 189     if length is not None and len(result) != length:
 190         return None
 191
 192     return result
 193
 194
 195 def EncodeBase58Check(vchIn):
 196     hash = Hash(vchIn)
 197     return b58encode(vchIn + hash[0:4])
 198
 199 def DecodeBase58Check(psz):
 200     vchRet = b58decode(psz, None)
 201     key = vchRet[0:-4]
 202     csum = vchRet[-4:]
 203     hash = Hash(key)
 204     cs32 = hash[0:4]
 205     if cs32 != csum:
 206         return None
 207     else:
 208         return key
 209
 210 def PrivKeyToSecret(privkey):
 211     return privkey[9:9+32]
 212
 213 def SecretToASecret(secret, compressed=False, addrtype=0):
 214     vchIn = chr((addrtype+128)&255) + secret
 215     if compressed: vchIn += '\01'
 216     return EncodeBase58Check(vchIn)
 217
 218 def ASecretToSecret(key, addrtype=0):
 219     vch = DecodeBase58Check(key)
 220     if vch and vch[0] == chr((addrtype+128)&255):
 221         return vch[1:]
 222     else:
 223         return False
 224
 225 def regenerate_key(sec):
 226     b = ASecretToSecret(sec)
 227     if not b:
 228         return False
 229     b = b[0:32]
 230     secret = int('0x' + b.encode('hex'), 16)
 231     return EC_KEY(secret)
 232
 233 def GetPubKey(pubkey, compressed=False):
 234     return i2o_ECPublicKey(pubkey, compressed)
 235
 236 def GetPrivKey(pkey, compressed=False):
 237     return i2d_ECPrivateKey(pkey, compressed)
 238
 239 def GetSecret(pkey):
 240     return ('%064x' % pkey.secret).decode('hex')
 241
 242 def is_compressed(sec):
 243     b = ASecretToSecret(sec)
 244     return len(b) == 33
 245
 246
 247 def address_from_private_key(sec):
 248     # rebuild public key from private key, compressed or uncompressed
 249     pkey = regenerate_key(sec)
 250     assert pkey
 251
 252     # figure out if private key is compressed
 253     compressed = is_compressed(sec)
 254
 255     # rebuild private and public key from regenerated secret
 256     private_key = GetPrivKey(pkey, compressed)
 257     public_key = GetPubKey(pkey.pubkey, compressed)
 258     address = public_key_to_bc_address(public_key)
 259     return address
 260
 261
 262 ########### end pywallet functions #######################
 263
 264 # secp256k1, http://www.oid-info.com/get/1.3.132.0.10
 265 _p = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2FL
 266 _r = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141L
 267 _b = 0x0000000000000000000000000000000000000000000000000000000000000007L
 268 _a = 0x0000000000000000000000000000000000000000000000000000000000000000L
 269 _Gx = 0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798L
 270 _Gy = 0x483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8L
 271 curve_secp256k1 = ecdsa.ellipticcurve.CurveFp( _p, _a, _b )
 272 generator_secp256k1 = ecdsa.ellipticcurve.Point( curve_secp256k1, _Gx, _Gy, _r )
 273 oid_secp256k1 = (1,3,132,0,10)
 274 SECP256k1 = ecdsa.curves.Curve("SECP256k1", curve_secp256k1, generator_secp256k1, oid_secp256k1 )
 275
 276 from ecdsa.util import string_to_number, number_to_string
 277
 278 def msg_magic(message):
 279     return "\x18Bitcoin Signed Message:\n" + chr( len(message) ) + message
 280
 281
 282 class EC_KEY(object):
 283     def __init__( self, secret ):
 284         self.pubkey = ecdsa.ecdsa.Public_key( generator_secp256k1, generator_secp256k1 * secret )
 285         self.privkey = ecdsa.ecdsa.Private_key( self.pubkey, secret )
 286         self.secret = secret
 287
 288     def sign_message(self, message, compressed, address):
 289         private_key = ecdsa.SigningKey.from_secret_exponent( self.secret, curve = SECP256k1 )
 290         public_key = private_key.get_verifying_key()
 291         signature = private_key.sign_digest( Hash( msg_magic(message) ), sigencode = ecdsa.util.sigencode_string )
 292         assert public_key.verify_digest( signature, Hash( msg_magic(message) ), sigdecode = ecdsa.util.sigdecode_string)
 293         for i in range(4):
 294             sig = base64.b64encode( chr(27 + i + (4 if compressed else 0)) + signature )
 295             try:
 296                 self.verify_message( address, sig, message)
 297                 return sig
 298             except:
 299                 continue
 300         else:
 301             raise BaseException("error: cannot sign message")
 302
 303     @classmethod
 304     def verify_message(self, address, signature, message):
 305         """ See http://www.secg.org/download/aid-780/sec1-v2.pdf for the math """
 306         from ecdsa import numbertheory, ellipticcurve, util
 307         import msqr
 308         curve = curve_secp256k1
 309         G = generator_secp256k1
 310         order = G.order()
 311         # extract r,s from signature
 312         sig = base64.b64decode(signature)
 313         if len(sig) != 65: raise BaseException("Wrong encoding")
 314         r,s = util.sigdecode_string(sig[1:], order)
 315         nV = ord(sig[0])
 316         if nV < 27 or nV >= 35:
 317             raise BaseException("Bad encoding")
 318         if nV >= 31:
 319             compressed = True
 320             nV -= 4
 321         else:
 322             compressed = False
 323
 324         recid = nV - 27
 325         # 1.1
 326         x = r + (recid/2) * order
 327         # 1.3
 328         alpha = ( x * x * x  + curve.a() * x + curve.b() ) % curve.p()
 329         beta = msqr.modular_sqrt(alpha, curve.p())
 330         y = beta if (beta - recid) % 2 == 0 else curve.p() - beta
 331         # 1.4 the constructor checks that nR is at infinity
 332         R = ellipticcurve.Point(curve, x, y, order)
 333         # 1.5 compute e from message:
 334         h = Hash( msg_magic(message) )
 335         e = string_to_number(h)
 336         minus_e = -e % order
 337         # 1.6 compute Q = r^-1 (sR - eG)
 338         inv_r = numbertheory.inverse_mod(r,order)
 339         Q = inv_r * ( s * R + minus_e * G )
 340         public_key = ecdsa.VerifyingKey.from_public_point( Q, curve = SECP256k1 )
 341         # check that Q is the public key
 342         public_key.verify_digest( sig[1:], h, sigdecode = ecdsa.util.sigdecode_string)
 343         # check that we get the original signing address
 344         addr = public_key_to_bc_address( encode_point(public_key, compressed) )
 345         if address != addr:
 346             raise BaseException("Bad signature")
 347
 348
 349 ###################################### BIP32 ##############################
 350
 351 def bip32_init(seed):
 352     import hmac
 353
 354     I = hmac.new("Bitcoin seed", seed, hashlib.sha512).digest()
 355
 356     print "seed", seed.encode('hex')
 357     master_secret = I[0:32]
 358     master_chain = I[32:]
 359
 360     # public key
 361     curve = SECP256k1
 362     master_private_key = ecdsa.SigningKey.from_string( master_secret, curve = SECP256k1 )
 363     master_public_key = master_private_key.get_verifying_key()
 364     K = master_public_key.to_string()
 365     K_compressed = GetPubKey(master_public_key.pubkey,True)
 366     return master_secret, master_chain, K, K_compressed
 367
 368
 369 def CKD(k, c, n):
 370     import hmac
 371     from ecdsa.util import string_to_number, number_to_string
 372     order = generator_secp256k1.order()
 373     keypair = EC_KEY(string_to_number(k))
 374     K = GetPubKey(keypair.pubkey,True)
 375     I = hmac.new(c, K + rev_hex(int_to_hex(n,4)).decode('hex'), hashlib.sha512).digest()
 376     k_n = number_to_string( (string_to_number(I[0:32]) * string_to_number(k)) % order , order )
 377     c_n = I[32:]
 378     return k_n, c_n
 379
 380
 381 def CKD_prime(K, c, n):
 382     import hmac
 383     from ecdsa.util import string_to_number, number_to_string
 384     order = generator_secp256k1.order()
 385
 386     K_public_key = ecdsa.VerifyingKey.from_string( K, curve = SECP256k1 )
 387     K_compressed = GetPubKey(K_public_key.pubkey,True)
 388
 389     I = hmac.new(c, K_compressed + rev_hex(int_to_hex(n,4)).decode('hex'), hashlib.sha512).digest()
 390
 391     #pubkey = ecdsa.ecdsa.Public_key( generator_secp256k1, string_to_number(I[0:32]) * K_public_key.pubkey.point )
 392     public_key = ecdsa.VerifyingKey.from_public_point( string_to_number(I[0:32]) * K_public_key.pubkey.point, curve = SECP256k1 )
 393     K_n = public_key.to_string()
 394     K_n_compressed = GetPubKey(public_key.pubkey,True)
 395     c_n = I[32:]
 396
 397     return K_n, K_n_compressed, c_n
 398
 399
 400
 401 class DeterministicSequence:
 402     """  Privatekey(type,n) = Master_private_key + H(n|S|type)  """
 403
 404     def __init__(self, master_public_key):
 405         self.master_public_key = master_public_key
 406
 407     @classmethod
 408     def from_seed(klass, seed):
 409         curve = SECP256k1
 410         secexp = klass.stretch_key(seed)
 411         master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 412         master_public_key = master_private_key.get_verifying_key().to_string().encode('hex')
 413         self = klass(master_public_key)
 414         return self
 415
 416     @classmethod
 417     def stretch_key(self,seed):
 418         oldseed = seed
 419         for i in range(100000):
 420             seed = hashlib.sha256(seed + oldseed).digest()
 421         return string_to_number( seed )
 422
 423     def get_sequence(self,n,for_change):
 424         return string_to_number( Hash( "%d:%d:"%(n,for_change) + self.master_public_key.decode('hex') ) )
 425
 426     def get_pubkey(self, n, for_change):
 427         curve = SECP256k1
 428         z = self.get_sequence(n, for_change)
 429         master_public_key = ecdsa.VerifyingKey.from_string( self.master_public_key.decode('hex'), curve = SECP256k1 )
 430         pubkey_point = master_public_key.pubkey.point + z*curve.generator
 431         public_key2 = ecdsa.VerifyingKey.from_public_point( pubkey_point, curve = SECP256k1 )
 432         return '04' + public_key2.to_string().encode('hex')
 433
 434     def get_private_key(self, n, for_change, seed):
 435         order = generator_secp256k1.order()
 436         secexp = self.stretch_key(seed)
 437         secexp = ( secexp + self.get_sequence(n,for_change) ) % order
 438         pk = number_to_string( secexp, generator_secp256k1.order() )
 439         compressed = False
 440         return SecretToASecret( pk, compressed )
 441
 442     def check_seed(self, seed):
 443         curve = SECP256k1
 444         secexp = self.stretch_key(seed)
 445         master_private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 446         master_public_key = master_private_key.get_verifying_key().to_string().encode('hex')
 447         if master_public_key != self.master_public_key:
 448             print_error('invalid password (mpk)')
 449             raise BaseException('Invalid password')
 450
 451         return True
 452
 453 ################################## transactions
 454
 455
 456
 457 def raw_tx( inputs, outputs, for_sig = None ):
 458
 459     s  = int_to_hex(1,4)                                         # version
 460     s += var_int( len(inputs) )                                  # number of inputs
 461     for i in range(len(inputs)):
 462         txin = inputs[i]
 463         s += txin['tx_hash'].decode('hex')[::-1].encode('hex')   # prev hash
 464         s += int_to_hex(txin['index'],4)                         # prev index
 465
 466         if for_sig is None:
 467             pubkeysig = txin.get('pubkeysig')
 468             if pubkeysig:
 469                 pubkey, sig = pubkeysig[0]
 470                 sig = sig + chr(1)                               # hashtype
 471                 script  = op_push( len(sig))
 472                 script += sig.encode('hex')
 473                 script += op_push( len(pubkey))
 474                 script += pubkey.encode('hex')
 475             else:
 476                 signatures = txin['signatures']
 477                 pubkeys = txin['pubkeys']
 478                 script = '00'                                    # op_0
 479                 for sig in signatures:
 480                     sig = sig + '01'
 481                     script += op_push(len(sig)/2)
 482                     script += sig
 483
 484                 redeem_script = multisig_script(pubkeys,2)
 485                 script += op_push(len(redeem_script)/2)
 486                 script += redeem_script
 487
 488         elif for_sig==i:
 489             if txin.get('redeemScript'):
 490                 script = txin['redeemScript']                    # p2sh uses the inner script
 491             else:
 492                 script = txin['raw_output_script']               # scriptsig
 493         else:
 494             script=''
 495         s += var_int( len(script)/2 )                            # script length
 496         s += script
 497         s += "ffffffff"                                          # sequence
 498
 499     s += var_int( len(outputs) )                                 # number of outputs
 500     for output in outputs:
 501         addr, amount = output
 502         s += int_to_hex( amount, 8)                              # amount
 503         addrtype, hash_160 = bc_address_to_hash_160(addr)
 504         if addrtype == 0:
 505             script = '76a9'                                      # op_dup, op_hash_160
 506             script += '14'                                       # push 0x14 bytes
 507             script += hash_160.encode('hex')
 508             script += '88ac'                                     # op_equalverify, op_checksig
 509         elif addrtype == 5:
 510             script = 'a9'                                        # op_hash_160
 511             script += '14'                                       # push 0x14 bytes
 512             script += hash_160.encode('hex')
 513             script += '87'                                       # op_equal
 514         else:
 515             raise
 516
 517         s += var_int( len(script)/2 )                           #  script length
 518         s += script                                             #  script
 519     s += int_to_hex(0,4)                                        #  lock time
 520     if for_sig is not None and for_sig != -1:
 521         s += int_to_hex(1, 4)                                   #  hash type
 522     return s
 523
 524
 525
 526
 527 def multisig_script(public_keys, num=None):
 528     # supports only "2 of 2", and "2 of 3" transactions
 529     n = len(public_keys)
 530
 531     if num is None:
 532         num = n
 533
 534     assert num <= n and n <= 3 and n >= 2
 535
 536     if num==2:
 537         s = '52'
 538     elif num == 3:
 539         s = '53'
 540     else:
 541         raise
 542
 543     for k in public_keys:
 544         s += var_int(len(k)/2)
 545         s += k
 546     if n==2:
 547         s += '52'
 548     elif n==3:
 549         s += '53'
 550     else:
 551         raise
 552     s += 'ae'
 553     return s
 554
 555
 556
 557 class Transaction:
 558
 559     def __init__(self, raw):
 560         self.raw = raw
 561         self.deserialize()
 562         self.inputs = self.d['inputs']
 563         self.outputs = self.d['outputs']
 564         self.outputs = map(lambda x: (x['address'],x['value']), self.outputs)
 565
 566     @classmethod
 567     def from_io(klass, inputs, outputs):
 568         raw = raw_tx(inputs, outputs, for_sig = -1) # for_sig=-1 means do not sign
 569         self = klass(raw)
 570         self.inputs = inputs
 571         self.outputs = outputs
 572         return self
 573
 574     def __str__(self):
 575         return self.raw
 576
 577     def for_sig(self,i):
 578         return raw_tx(self.inputs, self.outputs, for_sig = i)
 579
 580     def hash(self):
 581         return Hash(self.raw.decode('hex') )[::-1].encode('hex')
 582
 583     def sign(self, private_keys):
 584         import deserialize
 585
 586         for i in range(len(self.inputs)):
 587             txin = self.inputs[i]
 588
 589             if txin.get('redeemScript'):
 590                 # 1 parse the redeem script
 591                 num, redeem_pubkeys = deserialize.parse_redeemScript(txin.get('redeemScript'))
 592                 self.inputs[i]["pubkeys"] = redeem_pubkeys
 593
 594                 # build list of public/private keys
 595                 keypairs = {}
 596                 for sec in private_keys.values():
 597                     compressed = is_compressed(sec)
 598                     pkey = regenerate_key(sec)
 599                     pubkey = GetPubKey(pkey.pubkey, compressed)
 600                     keypairs[ pubkey.encode('hex') ] = sec
 601
 602                 # list of signatures
 603                 signatures = txin.get("signatures",[])
 604
 605                 # check if we have a key corresponding to the redeem script
 606                 for pubkey, privkey in keypairs.items():
 607                     if pubkey in redeem_pubkeys:
 608                         # add signature
 609                         compressed = is_compressed(sec)
 610                         pkey = regenerate_key(sec)
 611                         secexp = pkey.secret
 612                         private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 613                         public_key = private_key.get_verifying_key()
 614
 615                         tx = raw_tx( self.inputs, self.outputs, for_sig = i )
 616                         sig = private_key.sign_digest( Hash( tx.decode('hex') ), sigencode = ecdsa.util.sigencode_der )
 617                         assert public_key.verify_digest( sig, Hash( tx.decode('hex') ), sigdecode = ecdsa.util.sigdecode_der)
 618                         signatures.append( sig.encode('hex') )
 619
 620                 # for p2sh, pubkeysig is a tuple (may be incomplete)
 621                 self.inputs[i]["signatures"] = signatures
 622
 623             else:
 624                 sec = private_keys[txin['address']]
 625                 compressed = is_compressed(sec)
 626                 pkey = regenerate_key(sec)
 627                 secexp = pkey.secret
 628
 629                 private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 630                 public_key = private_key.get_verifying_key()
 631                 pkey = EC_KEY(secexp)
 632                 pubkey = GetPubKey(pkey.pubkey, compressed)
 633                 tx = raw_tx( self.inputs, self.outputs, for_sig = i )
 634                 sig = private_key.sign_digest( Hash( tx.decode('hex') ), sigencode = ecdsa.util.sigencode_der )
 635                 assert public_key.verify_digest( sig, Hash( tx.decode('hex') ), sigdecode = ecdsa.util.sigdecode_der)
 636
 637                 self.inputs[i]["pubkeysig"] = [(pubkey, sig)]
 638
 639         self.raw = raw_tx( self.inputs, self.outputs )
 640
 641
 642     def deserialize(self):
 643         import deserialize
 644         vds = deserialize.BCDataStream()
 645         vds.write(self.raw.decode('hex'))
 646         self.d = deserialize.parse_Transaction(vds)
 647         return self.d
 648
 649
 650     def has_address(self, addr):
 651         found = False
 652         for txin in self.inputs:
 653             if addr == txin.get('address'):
 654                 found = True
 655                 break
 656         for txout in self.outputs:
 657             if addr == txout[0]:
 658                 found = True
 659                 break
 660         return found
 661
 662
 663     def get_value(self, addresses, prevout_values):
 664         # return the balance for that tx
 665         is_send = False
 666         is_pruned = False
 667         v_in = v_out = v_out_mine = 0
 668
 669         for item in self.inputs:
 670             addr = item.get('address')
 671             if addr in addresses:
 672                 is_send = True
 673                 key = item['prevout_hash']  + ':%d'%item['prevout_n']
 674                 value = prevout_values.get( key )
 675                 if value is None:
 676                     is_pruned = True
 677                 else:
 678                     v_in += value
 679             else:
 680                 is_pruned = True
 681
 682         for item in self.outputs:
 683             addr, value = item
 684             v_out += value
 685             if addr in addresses:
 686                 v_out_mine += value
 687
 688         if not is_pruned:
 689             # all inputs are mine:
 690             fee = v_out - v_in
 691             v = v_out_mine - v_in
 692         else:
 693             # some inputs are mine:
 694             fee = None
 695             if is_send:
 696                 v = v_out_mine - v_out
 697             else:
 698                 # no input is mine
 699                 v = v_out_mine
 700
 701         return is_send, v, fee
 702
 703
 704
 705 def test_bip32():
 706     seed = "ff000000000000000000000000000000".decode('hex')
 707     master_secret, master_chain, master_public_key, master_public_key_compressed = bip32_init(seed)
 708
 709     print "secret key", master_secret.encode('hex')
 710     print "chain code", master_chain.encode('hex')
 711
 712     key_id = hash_160(master_public_key_compressed)
 713     print "keyid", key_id.encode('hex')
 714     print "base58"
 715     print "address", hash_160_to_bc_address(key_id)
 716     print "secret key", SecretToASecret(master_secret, True)
 717
 718     print "-- m/0 --"
 719     k0, c0 = CKD(master_secret, master_chain, 0)
 720     print "secret", k0.encode('hex')
 721     print "chain", c0.encode('hex')
 722     print "secret key", SecretToASecret(k0, True)
 723
 724     K0, K0_compressed, c0 = CKD_prime(master_public_key, master_chain, 0)
 725     print "address", hash_160_to_bc_address(hash_160(K0_compressed))
 726
 727     print "-- m/0/1 --"
 728     K01, K01_compressed, c01 = CKD_prime(K0, c0, 1)
 729     print "address", hash_160_to_bc_address(hash_160(K01_compressed))
 730
 731     print "-- m/0/1/3 --"
 732     K013, K013_compressed, c013 = CKD_prime(K01, c01, 3)
 733     print "address", hash_160_to_bc_address(hash_160(K013_compressed))
 734
 735     print "-- m/0/1/3/7 --"
 736     K0137, K0137_compressed, c0137 = CKD_prime(K013, c013, 7)
 737     print "address", hash_160_to_bc_address(hash_160(K0137_compressed))
 738
 739
 740 def test_p2sh():
 741
 742     print "2 of 2"
 743     pubkeys = ["04e89a79651522201d756f14b1874ae49139cc984e5782afeca30ffe84e5e6b2cfadcfe9875c490c8a1a05a4debd715dd57471af8886ab5dfbb3959d97f087f77a",
 744                "0455cf4a3ab68a011b18cb0a86aae2b8e9cad6c6355476de05247c57a9632d127084ac7630ad89893b43c486c5a9f7ec6158fb0feb708fa9255d5c4d44bc0858f8"]
 745     s = multisig_script(pubkeys)
 746     print "address", hash_160_to_bc_address(hash_160(s.decode('hex')), 5)
 747
 748
 749     print "Gavin's tutorial: redeem p2sh:  http://blockchain.info/tx-index/30888901"
 750     pubkey1 = "0491bba2510912a5bd37da1fb5b1673010e43d2c6d812c514e91bfa9f2eb129e1c183329db55bd868e209aac2fbc02cb33d98fe74bf23f0c235d6126b1d8334f86"
 751     pubkey2 = "04865c40293a680cb9c020e7b1e106d8c1916d3cef99aa431a56d253e69256dac09ef122b1a986818a7cb624532f062c1d1f8722084861c5c3291ccffef4ec6874"
 752     pubkey3 = "048d2455d2403e08708fc1f556002f1b6cd83f992d085097f9974ab08a28838f07896fbab08f39495e15fa6fad6edbfb1e754e35fa1c7844c41f322a1863d46213"
 753     pubkeys = [pubkey1, pubkey2, pubkey3]
 754
 755     tx = Transaction.from_io(
 756         [{'tx_hash':'3c9018e8d5615c306d72397f8f5eef44308c98fb576a88e030c25456b4f3a7ac', 'index':0,
 757           'raw_output_script':'a914f815b036d9bbbce5e9f2a00abd1bf3dc91e9551087', 'redeemScript':multisig_script(pubkeys, 2)}],
 758         [('1GtpSrGhRGY5kkrNz4RykoqRQoJuG2L6DS',1000000)])
 759
 760     tx_for_sig = tx.for_sig(0)
 761     print "tx for sig", tx_for_sig
 762
 763     signature1 = "304502200187af928e9d155c4b1ac9c1c9118153239aba76774f775d7c1f9c3e106ff33c0221008822b0f658edec22274d0b6ae9de10ebf2da06b1bbdaaba4e50eb078f39e3d78"
 764     signature2 = "30440220795f0f4f5941a77ae032ecb9e33753788d7eb5cb0c78d805575d6b00a1d9bfed02203e1f4ad9332d1416ae01e27038e945bc9db59c732728a383a6f1ed2fb99da7a4"
 765
 766     for pubkey in pubkeys:
 767         import traceback, sys
 768
 769         public_key = ecdsa.VerifyingKey.from_string(pubkey[2:].decode('hex'), curve = SECP256k1)
 770
 771         try:
 772             public_key.verify_digest( signature1.decode('hex'), Hash( tx_for_sig.decode('hex') ), sigdecode = ecdsa.util.sigdecode_der)
 773             print True
 774         except ecdsa.keys.BadSignatureError:
 775             #traceback.print_exc(file=sys.stdout)
 776             print False
 777
 778         try:
 779             public_key.verify_digest( signature2.decode('hex'), Hash( tx_for_sig.decode('hex') ), sigdecode = ecdsa.util.sigdecode_der)
 780             print True
 781         except ecdsa.keys.BadSignatureError:
 782             #traceback.print_exc(file=sys.stdout)
 783             print False
 784
 785 if __name__ == '__main__':
 786     #test_bip32()
 787     test_p2sh()
 788