sig4 - http://docs.aws.amazon.com/general/latest/gr//sigv4-calculate-signature.html

sig4-python2.py

import hmac, hashlib

#http://docs.aws.amazon.com/general/latest/gr//sigv4-calculate-signature.html
DateKey = hmac.new(b'AWS4wJalrXUtnFEMI/K7MDENG+bPxRfiCYEXAMPLEKEY', b'20150830', hashlib.sha256).digest()
print("kdate: " + hmac.new(b'AWS4wJalrXUtnFEMI/K7MDENG+bPxRfiCYEXAMPLEKEY', b'20150830', 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())

string_to_sign = '''AWS4-HMAC-SHA256
20150830T123600Z
20150830/us-east-1/iam/aws4_request
f536975d06c0309214f805bb90ccff089219ecd68b2577efef23edd43b7e1a59'''
signature = hmac.new(SigningKey, string_to_sign, hashlib.sha256).hexdigest()
print('signature: ' + signature)

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