text: """
  *******************************************************************************
  *   Ledger Blue
  *   (c) 2016 Ledger
  *
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS,
  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
  ********************************************************************************
  """
  
  import argparse
  
  def get_argparser():
  	parser = argparse.ArgumentParser(description="Verify a message signature created with Endorsement Scheme #1.")
  	parser.add_argument("--key", help="The endorsement public key with which to verify the signature (hex encoded)")
  	parser.add_argument("--codehash", help="The hash of the app associated with the endorsement request (hex encoded)")
  	parser.add_argument("--message", help="The message associated to the endorsement request (hex encoded)")
  	parser.add_argument("--signature", help="The signature to be verified (hex encoded)")
  	return parser
  
  if __name__ == '__main__':
  	from .ecWrapper import PublicKey
  	import hashlib
  	import binascii
  
  	args = get_argparser().parse_args()
  
  	if args.key == None:
  		raise Exception("Missing public key")
  	if args.codehash == None:
  		raise Exception("Missing code hash")
  	if args.message == None:
  		raise Exception("Missing message")
  	if args.signature == None:
  		raise Exception("Missing signature")
  
  	# prepare data
  	m = hashlib.sha256()
  	m.update(bytes(bytearray.fromhex(args.message)))
  	m.update(bytes(bytearray.fromhex(args.codehash)))
  	digest = m.digest()
  
  	publicKey = PublicKey(bytes(bytearray.fromhex(args.key)), raw=True)
  	signature = publicKey.ecdsa_deserialize(bytes(bytearray.fromhex(args.signature)))
  	if not publicKey.ecdsa_verify(bytes(digest), signature, raw=True):
  		raise Exception("Endorsement not verified")
  
  	print("Endorsement verified")
  