2 February 2016

Generating HMAC (Hash-based Message Authentication Code) involves the use of a "private" key, which is a secret key known only to the sender and the receiver. This key is used to create a digital signature for a message, which can then be verified by the receiver to ensure the message has not been tampered with during transmission.

Double encoding involves encoding the private key twice using a cryptographic hash function. This makes it more difficult for an attacker to guess the private key by brute force, as they would need to break the hash function twice to retrieve the original key.

In Python, you can achieve this double encoding using two libraries: hashlib and hmac. The hashlib library provides a set of secure hash algorithms that can be used to create a hash of the private key, while the hmac library provides a method for creating an HMAC using the hashed key and the message to be authenticated.

Source code viewer
  1. import hashlib
  2. import hmac
  3.  
  4. key = '8oe0i89o7es243t5s234'
  5. message = 'Body text for the hash.';
  6.  
  7. # Generate the hash.
  8. signature = hmac.new(
  9.     key,
  10.     message,
  11.     hashlib.sha256
  12. ).hexdigest()
Programming Language: Python