Bitcoin SE debugging

import __future__

# from pybitcointools import sha256
import hashlib #, ecdsa

# from ecdsa import SigningKey, SECP256k1
from pycoin.ecdsa import *

import string
import array
import binascii

def rev(str):
    ret = ""
    for i in range(0, len(str), 2):
        ret = str[i:i+2] + ret
    return ret

def revbyfours(s):
    res = ""
    for i in range(int(len(s)/8)):
        res += rev(s[8*i:8*i+8])
    return res

def verify_sig(sig, prefix, xpub, signed_val):
    is_even = (prefix % 2 == 0)
    pub_pair = public_pair_for_x(generator_secp256k1, xpub, is_even)
    print("sig: (" + hex(sig[0])      + ", " + hex(sig[1])      + ")")
    print("pub: (" + hex(pub_pair[0]) + ", " + hex(pub_pair[1]) + ")")
    print("hex: "  + hex(signed_val))

    print("is valid: " + str(verify(generator_secp256k1, pub_pair, signed_val, sig)))

def DoubleHash(string):
    bin = binascii.unhexlify(string)
    hash = hashlib.sha256(hashlib.sha256(bin).digest()).digest()
    raw = str(binascii.hexlify(hash))[2:-1]
    return rev(raw)

def DER(r, s):
    rlen = int(len(r)/2)
    if (rlen == 32 and int(r[0:2], 16) > 0x7F):
        rlen += 1

    slen = int(len(s)/2)
    if (slen == 32 and int(s[0:2], 16) > 0x7F):
        slen += 1

    res = "30"
    res += hex(4 + rlen + slen)[2:].zfill(2)
    res += "02"
    res += hex(rlen)[2:].zfill(2)
    res += r
    res += "02"
    res += hex(slen)[2:].zfill(2)
    res += s
    return res

addr     = 'mu858WTEPiWWpAJRTMxC4ka6DJqiaCZiSB'
pubkey_x = 0x79b22a5127d176a49d506c86f791031f94a389227ef46a8ddb725a88c944c37e
pubkey_y = 0x3f753de6ee0b441a0237801f140810e111a1fd8276a2a5d0ee07224a1b551cc1

# TX structure with 00 as scriptSig, from bitcoincore createrawtransaction
rawtx = '01000000015a800fd903679acfe9d4e2fedb752b24c4d7a574b4c82a113dfb993b3864b7720100000000ffffffff01c09ee605000000001976a914dd6cce9f255a8cc17bda8ba0373df8e861cb866e88ac00000000'

# replacing the '00' scriptSig value
unsigned = ""

unsigned += rawtx[:82]
print (unsigned)

unsigned += '19'+'76a914953de657be4b305f606d9a9fbd35b070a682475788ac' # scriptSig = scriptPubKey input
print (unsigned)

unsigned += rawtx[84:]
print (unsigned)

unsigned += '01000000'  # appending sighash_all
print (unsigned)

unsigned = ''.join(unsigned)
print (unsigned)

# unsigned = '01000000015a800fd903679acfe9d4e2fedb752b24c4d7a574b4c82a113dfb993b3864b772010000001976a914953de657be4b305f606d9a9fbd35b070a682475788acffffffff01c09ee605000000001976a914dd6cce9f255a8cc17bda8ba0373df8e861cb866e88ac0000000001000000'

# See https://github.com/warner/python-ecdsa/blob/master/README.md

# hashToSign = DoubleHash(unsigned)
hashToSign = rev(revbyfours(DoubleHash(unsigned)))
htsBytes = binascii.unhexlify(hashToSign)
htsInt = int(hashToSign, 16)

print ("hts: " + hashToSign)
# priv key for WIF: 93FxXUeMJp93YQAtGeW5cE23gFN4sJbBr1RBmerLFVUDuqQqKL5
priv = 0xdc57c6d067376c36bbed632c9d00f03767867f337d5a86b5b0308a60004f08ee

sig = sign(generator_secp256k1, priv, htsInt)

r = hex(sig[0])[2:]
s = hex(sig[1])[2:]

#print ("r: " + r)
#print ("s: " + s)

derSig = DER(r, s) + "01" # 01 is for sighashall
derSig = hex(int(len(derSig)/2))[2:].zfill(2) + derSig

#print ("der: " + derSig)

pub = "410479b22a5127d176a49d506c86f791031f94a389227ef46a8ddb725a88c944c37e3f753de6ee0b441a0237801f140810e111a1fd8276a2a5d0ee07224a1b551cc1"

# inserting the signature into the 00 the core software uses in place of ScriptSig
signed = rawtx[:82] + hex(int(len(derSig + pub)/2))[2:].zfill(2) + derSig + pub + rawtx[84:]

print ("signed: " + signed)