simple_transaction.py

#!/usr/bin/python2

import hashlib
import ed25519ll
import struct
import json
import urllib2
import time

LISK_EPOCH = 1464066000

passphrase = 'Your 12 word passphrase here'
recipient_id = "54834883818072291L" # Put in the real recipient

def create_transaction(recipient_id, passphrase, amount, timestamp):
  # create ed25519 seed from passphrase (which ends up being the private key)
  seed = hashlib.sha256(passphrase).digest()
  # create key pair
  keypair = ed25519ll.crypto_sign_keypair(seed=seed)

  # this dictionary is used to create the json object
  transaction = {};

  # strip off L, convert passed in recipient_id into an integer, then make it big endian - for use in byte array
  recipient_id_temp = struct.pack('>q', int(recipient_id[:len(recipient_id) - 1]))
  transaction["amount"] = str(amount)                          # string
  transaction["recipientId"] = recipient_id                    # string
  transaction["senderPublicKey"] = keypair.vk.encode('hex')    # hex string
  transaction["timestamp"] = timestamp                         # int
  transaction["type"] = 0                                      # int
  transaction["fee"] = "10000000"                              # string

  # create a byte array / unpadded struct with the dictionary members - order matters
  transaction_bytes = struct.pack('=bi32s' + str(len(recipient_id_temp)) + 'sq', transaction["type"], transaction["timestamp"], keypair.vk, recipient_id_temp, int(transaction["amount"]))
  # hash the byte array
  transaction_hash = hashlib.sha256(transaction_bytes).digest()
  # sign transaction
  signed = ed25519ll.crypto_sign(transaction_hash, keypair.sk)
  signed = signed[:64] # ed25519 signatures are 512 bits in length

  transaction["signature"] = signed.encode('hex')

  # add signature to byte array
  transaction_bytes = struct.pack('=bi32s' + str(len(recipient_id_temp)) + 'sq64s', transaction["type"], transaction["timestamp"], keypair.vk, recipient_id_temp, int(transaction["amount"]), signed)
  # hash with signature - to use when creating transaction id
  transaction_hash = hashlib.sha256(transaction_bytes).digest()
  # create transaction id
  transaction["id"] = [s for s in transaction_hash[:8]]
  transaction["id"].reverse()
  transaction["id"] = str(int("".join(transaction["id"]).encode('hex'), 16))

  transaction["asset"] = {} # needed for json
  # return transaction json
  return json.dumps(transaction)

t = int(time.time()) - LISK_EPOCH
transaction = create_transaction(recipient_id, passphrase, 1, t)
transaction = transaction.strip()
print transaction

# post transaction
req = urllib2.Request("http://testnet.lisk.io:7000/api/transactions", transaction, {'Content-Type': 'application/json', 'Content-Length': len(transaction)})
try:
  f = urllib2.urlopen(req)
  response = f.read()
  f.close()
  print response
except Exception as e:
  print e.msg
  print e.hdrs
  print e.geturl()
  print e.readlines()
  print dir(e)