sig4 - http://docs.aws.amazon.com/general/latest/gr/signature-v4-examples.html#signature-v4-examples-python

sig4-python1.py

import hmac, hashlib

#http://docs.aws.amazon.com/general/latest/gr/signature-v4-examples.html#signature-v4-examples-python
DateKey = hmac.new(b'AWS4wJalrXUtnFEMI/K7MDENG+bPxRfiCYEXAMPLEKEY', b'20120215', hashlib.sha256).digest()
print("kdate: " + hmac.new(b'AWS4wJalrXUtnFEMI/K7MDENG+bPxRfiCYEXAMPLEKEY', b'20120215', hashlib.sha256).hexdigest())

DateRegionKey = hmac.new(DateKey, b'us-east-1', hashlib.sha256).digest()
print("kRegion: " + hmac.new(DateKey, b'us-east-1', hashlib.sha256).hexdigest())

DateRegionServiceKey = hmac.new(DateRegionKey, b'iam', hashlib.sha256).digest()
print('kService: ' + hmac.new(DateRegionKey, b'iam', hashlib.sha256).hexdigest())

SigningKey = hmac.new(DateRegionServiceKey, b'aws4_request', hashlib.sha256).digest()
print('kSigning: ' + hmac.new(DateRegionServiceKey, b'aws4_request', hashlib.sha256).hexdigest())