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