#!/usr/bin/env python
#
# Electrum - lightweight Bitcoin client
# Copyright (C) 2011 thomasv@gitorious
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import hashlib, base64, ecdsa, re
def rev_hex(s):
return s.decode('hex')[::-1].encode('hex')
def int_to_hex(i, length=1):
s = hex(i)[2:].rstrip('L')
s = "0"*(2*length - len(s)) + s
return rev_hex(s)
def var_int(i):
if i<0xfd:
return int_to_hex(i)
elif i<=0xffff:
return "fd"+int_to_hex(i,2)
elif i<=0xffffffff:
return "fe"+int_to_hex(i,4)
else:
return "ff"+int_to_hex(i,8)
Hash = lambda x: hashlib.sha256(hashlib.sha256(x).digest()).digest()
hash_encode = lambda x: x[::-1].encode('hex')
hash_decode = lambda x: x.decode('hex')[::-1]
# pywallet openssl private key implementation
def i2d_ECPrivateKey(pkey, compressed=False):
if compressed:
key = '3081d30201010420' + \
'%064x' % pkey.secret + \
'a081a53081a2020101302c06072a8648ce3d0101022100' + \
'%064x' % _p + \
'3006040100040107042102' + \
'%064x' % _Gx + \
'022100' + \
'%064x' % _r + \
'020101a124032200'
else:
key = '308201130201010420' + \
'%064x' % pkey.secret + \
'a081a53081a2020101302c06072a8648ce3d0101022100' + \
'%064x' % _p + \
'3006040100040107044104' + \
'%064x' % _Gx + \
'%064x' % _Gy + \
'022100' + \
'%064x' % _r + \
'020101a144034200'
return key.decode('hex') + i2o_ECPublicKey(pkey, compressed)
def i2o_ECPublicKey(pkey, compressed=False):
# public keys are 65 bytes long (520 bits)
# 0x04 + 32-byte X-coordinate + 32-byte Y-coordinate
# 0x00 = point at infinity, 0x02 and 0x03 = compressed, 0x04 = uncompressed
# compressed keys: <sign> <x> where <sign> is 0x02 if y is even and 0x03 if y is odd
if compressed:
if pkey.pubkey.point.y() & 1:
key = '03' + '%064x' % pkey.pubkey.point.x()
else:
key = '02' + '%064x' % pkey.pubkey.point.x()
else:
key = '04' + \
'%064x' % pkey.pubkey.point.x() + \
'%064x' % pkey.pubkey.point.y()
return key.decode('hex')
# end pywallet openssl private key implementation
############ functions from pywallet #####################
addrtype = 0
def hash_160(public_key):
try:
md = hashlib.new('ripemd160')
md.update(hashlib.sha256(public_key).digest())
return md.digest()
except:
import ripemd
md = ripemd.new(hashlib.sha256(public_key).digest())
return md.digest()
def public_key_to_bc_address(public_key):
h160 = hash_160(public_key)
return hash_160_to_bc_address(h160)
def hash_160_to_bc_address(h160):
vh160 = chr(addrtype) + h160
h = Hash(vh160)
addr = vh160 + h[0:4]
return b58encode(addr)
def bc_address_to_hash_160(addr):
bytes = b58decode(addr, 25)
return bytes[1:21]
def encode_point(pubkey, compressed=False):
order = generator_secp256k1.order()
p = pubkey.pubkey.point
x_str = ecdsa.util.number_to_string(p.x(), order)
y_str = ecdsa.util.number_to_string(p.y(), order)
if compressed:
return chr(2 + (p.y() & 1)) + x_str
else:
return chr(4) + pubkey.to_string() #x_str + y_str
__b58chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
__b58base = len(__b58chars)
def b58encode(v):
""" encode v, which is a string of bytes, to base58."""
long_value = 0L
for (i, c) in enumerate(v[::-1]):
long_value += (256**i) * ord(c)
result = ''
while long_value >= __b58base:
div, mod = divmod(long_value, __b58base)
result = __b58chars[mod] + result
long_value = div
result = __b58chars[long_value] + result
# Bitcoin does a little leading-zero-compression:
# leading 0-bytes in the input become leading-1s
nPad = 0
for c in v:
if c == '\0': nPad += 1
else: break
return (__b58chars[0]*nPad) + result
def b58decode(v, length):
""" decode v into a string of len bytes."""
long_value = 0L
for (i, c) in enumerate(v[::-1]):
long_value += __b58chars.find(c) * (__b58base**i)
result = ''
while long_value >= 256:
div, mod = divmod(long_value, 256)
result = chr(mod) + result
long_value = div
result = chr(long_value) + result
nPad = 0
for c in v:
if c == __b58chars[0]: nPad += 1
else: break
result = chr(0)*nPad + result
if length is not None and len(result) != length:
return None
return result
def EncodeBase58Check(vchIn):
hash = Hash(vchIn)
return b58encode(vchIn + hash[0:4])
def DecodeBase58Check(psz):
vchRet = b58decode(psz, None)
key = vchRet[0:-4]
csum = vchRet[-4:]
hash = Hash(key)
cs32 = hash[0:4]
if cs32 != csum:
return None
else:
return key
def PrivKeyToSecret(privkey):
return privkey[9:9+32]
def SecretToASecret(secret, compressed=False):
vchIn = chr((addrtype+128)&255) + secret
if compressed: vchIn += '\01'
return EncodeBase58Check(vchIn)
def ASecretToSecret(key):
vch = DecodeBase58Check(key)
if vch and vch[0] == chr((addrtype+128)&255):
return vch[1:]
else:
return False
def regenerate_key(sec):
b = ASecretToSecret(sec)
if not b:
return False
b = b[0:32]
secret = int('0x' + b.encode('hex'), 16)
return EC_KEY(secret)
def GetPubKey(pkey, compressed=False):
return i2o_ECPublicKey(pkey, compressed)
def GetPrivKey(pkey, compressed=False):
return i2d_ECPrivateKey(pkey, compressed)
def GetSecret(pkey):
return ('%064x' % pkey.secret).decode('hex')
def is_compressed(sec):
b = ASecretToSecret(sec)
return len(b) == 33
########### end pywallet functions #######################
# secp256k1, http://www.oid-info.com/get/1.3.132.0.10
_p = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2FL
_r = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141L
_b = 0x0000000000000000000000000000000000000000000000000000000000000007L
_a = 0x0000000000000000000000000000000000000000000000000000000000000000L
_Gx = 0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798L
_Gy = 0x483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8L
curve_secp256k1 = ecdsa.ellipticcurve.CurveFp( _p, _a, _b )
generator_secp256k1 = ecdsa.ellipticcurve.Point( curve_secp256k1, _Gx, _Gy, _r )
oid_secp256k1 = (1,3,132,0,10)
SECP256k1 = ecdsa.curves.Curve("SECP256k1", curve_secp256k1, generator_secp256k1, oid_secp256k1 )
class EC_KEY(object):
def __init__( self, secret ):
self.pubkey = ecdsa.ecdsa.Public_key( generator_secp256k1, generator_secp256k1 * secret )
self.privkey = ecdsa.ecdsa.Private_key( self.pubkey, secret )
self.secret = secret
def filter(s):
out = re.sub('( [^\n]*|)\n','',s)
out = out.replace(' ','')
out = out.replace('\n','')
return out
# https://en.bitcoin.it/wiki/Protocol_specification#Variable_length_integer
def raw_tx( inputs, outputs, for_sig = None ):
s = int_to_hex(1,4) + ' version\n'
s += var_int( len(inputs) ) + ' number of inputs\n'
for i in range(len(inputs)):
_, _, p_hash, p_index, p_script, pubkey, sig = inputs[i]
s += p_hash.decode('hex')[::-1].encode('hex') + ' prev hash\n'
s += int_to_hex(p_index,4) + ' prev index\n'
if for_sig is None:
sig = sig + chr(1) # hashtype
script = int_to_hex( len(sig)) + ' push %d bytes\n'%len(sig)
script += sig.encode('hex') + ' sig\n'
script += int_to_hex( len(pubkey)) + ' push %d bytes\n'%len(pubkey)
script += pubkey.encode('hex') + ' pubkey\n'
elif for_sig==i:
script = p_script + ' scriptsig \n'
else:
script=''
s += var_int( len(filter(script))/2 ) + ' script length \n'
s += script
s += "ffffffff" + ' sequence\n'
s += var_int( len(outputs) ) + ' number of outputs\n'
for output in outputs:
addr, amount = output
s += int_to_hex( amount, 8) + ' amount: %d\n'%amount
script = '76a9' # op_dup, op_hash_160
script += '14' # push 0x14 bytes
script += bc_address_to_hash_160(addr).encode('hex')
script += '88ac' # op_equalverify, op_checksig
s += var_int( len(filter(script))/2 ) + ' script length \n'
s += script + ' script \n'
s += int_to_hex(0,4) # lock time
if for_sig is not None: s += int_to_hex(1, 4) # hash type
return s