python sha256 encryption code example

Example 1: sha256 decrypt python

The point of a hash like sha256 is that it is supposed to be a one way function
(although the existence of true one way functions is still an open question,
see http://en.wikipedia.org/wiki/One-way_function).

The ideal cryptographic hash function has four main properties:

1. It is easy to compute the hash value for any given message
2. It is infeasible to generate a message that has a given hash
3. It is infeasible to modify a message without changing the hash
4. It is infeasible to find two different messages with the same hash.

Example 2: python hmac sha256

# python 2
import hmac
import hashlib

nonce = 1234
customer_id = 123232
api_key = 2342342348273482374343434
API_SECRET = 892374928347928347283473

message = '{} {} {}'.format(nonce, customer_id, api_key)
signature = hmac.new(
    str(API_SECRET),
    msg=message,
    digestmod=hashlib.sha256
).hexdigest().upper()

print signature

Example 3: sha 256 python

import hashlib

secret_thing = hashlib.sha256()
# Keep in mind you add on to the already existing string when you .update the same thing.
secret_thing.update(b"hahahahaahhahaa nobody will guess my secret message")

secret_thing.digest_size
secret_thing.block_size