# create a BIP70 payment request signed with a certificate

import tlslite

import time

import hashlib

from electrum import paymentrequest_pb2 as pb2

from electrum.transaction import Transaction

from electrum import bitcoin

from electrum import x509

chain_file = 'mychain.pem'

cert_file = 'mycert.pem'

amount = 1000000

address = "18U5kpCAU4s8weFF8Ps5n8HAfpdUjDVF64"

memo = "blah"

out_file = "payreq"

with open(chain_file, 'r') as f:

chain = tlslite.X509CertChain()

chain.parsePemList(f.read())

certificates = pb2.X509Certificates()

certificates.certificate.extend(map(lambda x: str(x.bytes), chain.x509List))

with open(cert_file, 'r') as f:

rsakey = tlslite.utils.python_rsakey.Python_RSAKey.parsePEM(f.read())

def make_payment_request(amount, script, memo):

"""Generates a http PaymentRequest object"""

pd = pb2.PaymentDetails()

pd.outputs.add(amount=amount, script=script)

now = int(time.time())

pd.time = now

pd.expires = now + 15*60

pd.memo = memo

pd.payment_url = 'http://payment_ack.url'

pr = pb2.PaymentRequest()

pr.serialized_payment_details = pd.SerializeToString()

pr.pki_type = 'x509+sha256'

pr.pki_data = certificates.SerializeToString()

pr.signature = ''

msgBytes = bytearray(pr.SerializeToString())

hashBytes = bytearray(hashlib.sha256(msgBytes).digest())

sig = rsakey.sign(x509.PREFIX_RSA_SHA256 + hashBytes)

pr.signature = bytes(sig)

return pr.SerializeToString()

script = Transaction.pay_script('address', address).decode('hex')

pr_string = make_payment_request(amount, script, memo)

with open(out_file,'wb') as f:

f.write(pr_string)

print "Payment request was written to file '%s'"%out_file