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@jeiting jeiting/signing.py Secret
Created Mar 12, 2019

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import json
import uuid
import time
import hashlib
import base64
from ecdsa import SigningKey
from ecdsa.util import sigencode_der
bundle_id = 'com.myapp'
key_id = 'XWSXTGQVX2'
product = 'com.myapp.product.a'
offer = 'REFERENCE_CODE' # This is the code set in ASC
application_username = 'user_name' # Should be the same you use when
# making purchases
nonce = uuid.uuid4()
timestamp = int(round(time.time() * 1000))
payload = '\u2063'.join([bundle_id,
key_id,
product,
offer,
application_username,
str(nonce), # Should be lower case
str(timestamp)])
# Read the key file
with open('cert.der', 'rb') as myfile:
der = myfile.read()
signing_key = SigningKey.from_der(der)
signature = signing_key.sign(payload.encode('utf-8'),
hashfunc=hashlib.sha256,
sigencode=sigencode_der)
encoded_signature = base64.b64encode(signature)
print(str(encoded_signature, 'utf-8'), str(nonce), str(timestamp), key_id)
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