This script takes a filename as argument and will produce the opcodes to push this string onto the stack

pushstring.py

#!/usr/bin/env python
# Author: @itseco 
# This script takes a filename as argument
# and will produce the opcodes 
# to push this string onto the stack
# Original file: pvePushString.pl (www.corelan.be)

import sys
if len(sys.argv) < 2:
    print "  usage: %s \"String to put on stack\"" % sys.argv[0]
    exit(0)

# Convert string to bytes
str_to_push = sys.argv[1]
str_this_hex = ""
byte_cnt = 0
str_hex = ""
str_opcodes = ""
str_push = ""
print "String lenght : %d" % len(str_to_push)
print "Opcodes to push this string onto the stack :\n"

for str_this_char in str_to_push:
    str_this_hex = "\\x" +  str_this_char.encode("hex")
    if byte_cnt < 3:
        str_hex += str_this_hex
        byte_cnt += 1
    else:
        str_push = str_hex + str_this_hex
        str_push = str_push.replace("\\x", "")
        str_hex = '"\\x68%s"    //PUSH 0x%s%s%s%s' % (str_hex + str_this_hex, str_push[6:8], str_push[4:6], str_push[2:4], str_push[0:2])
        str_opcodes = str_hex + "\n" + str_opcodes
        str_hex = ""
        byte_cnt = 0

# Last line
if len(str_hex) > 0:
    while len(str_hex) < 12:
        str_hex += "\\x20"
    str_push = str_hex
    str_push = str_push.replace("\\x", "")
    str_hex = '"\\x68%s\\x00"    //PUSH 0x00%s%s%s' % (str_hex, str_push[4:6], str_push[2:4], str_push[0:2])
    str_opcodes = str_hex + "\n" + str_opcodes
else:
    # add line with spaces + null byte (string terminator)
    str_opcodes = '"\\x68\\x20\\x20\\x20\\x20"  //PUSH 0x00202020' + "\n" + str_opcodes

print str_opcodes