[Tutor] sha-256 without using hashlib

[Arijit Ukil]

I like to implement sha-256 without using implement. It is easy using 
hashlib as:

import hashlib
m = hashlib.sha256()
m.update("hi")
print m.hexdigest()

If anybody has pointer on sha-256 implemented without using hashlib 
library, please share.

Regards,
Arijit Ukil
Tata Consultancy Services
Mailto: arijit.ukil at tcs.com
Website: http://www.tcs.com
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