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Compute signature of a http from Hoiio. This is used to authenticate the notification from Hoiio. Match this computed signature with the HTTP header "X-Hoiio-Signature".
import hmac
import hashlib
def sign(payload, key):
dig =, msg=payload, digestmod=hashlib.sha256).digest()
return dig.encode('hex')
if __name__ == "__main__":
import sys
if (len(sys.argv) == 3):
payload = sys.argv[1];
accessToken = sys.argv[2];
# Example
payload = 'to=%2B6511111111&dest=&session=S32&tag=&call_state=ringing&from=%2B6522222222&txn_ref=AA-C-1000000'
print "Computed Signature: " + sign(payload, accessToken)
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