def credential_scope(region, service_name, when):
return ''.join([
datefmt(when),
'/',
region,
'/',
service_name,
'/',
'aws4_request',
])
def _signing_key(secret_key, when, region, service_name):
'''
Generates signing key and all intermediate values
Mainly useful for testing. Normally use signing_key() instead.
'''
vals = dict()
vals['kSecret'] = b'AWS4' + secret_key.encode('utf-8')
vals['kDate'] = hmacdigest(vals['kSecret'], datefmt(when))
vals['kRegion'] = hmacdigest(vals['kDate'], region)
vals['kService'] = hmacdigest(vals['kRegion'], service_name)
vals['kSigning'] = hmacdigest(vals['kService'], "aws4_request")
return vals