HMAC SHA1 for Amazon S3

Demonstrates the HMAC SHA1 computation required by the Amazon S3 web service.

Download Chilkat Python Library

import sys
import chilkat

#  This example uses sample data from:
#  http://docs.amazonwebservices.com/AmazonS3/2006-03-01/RESTAuthentication.html
strToSign = "GET" + "\n" + "\n" + "\n" + "Tue, 27 Mar 2007 19:36:42 +0000" + "\n" + "/johnsmith/photos/puppy.jpg"

crypt = chilkat.CkCrypt2()

success = crypt.UnlockComponent("Anything for 30-day trial.")
if (success != True):
    #  Unlock Failed.
    print crypt.lastErrorText()
    sys.exit()

#  We want SHA1 for the HMAC hash algorithm:
crypt.put_HashAlgorithm("sha1")

AWSAccessKeyId = "0PN5J17HBGZHT7JJ3X82"
AWSSecretAccessKey = "uV3F3YluFJax1cknvbcGwgjvx4QpvB+leU8dUj2o"

#  Set the HMAC secret key:
crypt.SetHmacKeyString(AWSSecretAccessKey)

#  By setting the charset = "utf-8", the string will be converted
#  to utf-8 (internal to the Chilkat component) prior to signing:
crypt.put_Charset("utf-8")

#  Indicate that Base64 output is desired:
crypt.put_EncodingMode("base64")

signature = crypt.hmacStringENC(strToSign)
print crypt.lastErrorText()

#  Display the signature as part of the HTTP Authorization header:
print "Authorization: AWS " + AWSAccessKeyId\
     + ":" + signature

print "Expected:      AWS 0PN5J17HBGZHT7JJ3X82:xXjDGYUmKxnwqr5KXNPGldn5LbA="