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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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