Design the cryptosystem by providing step by step implementation of the encryption algorithm of Hash-based Message Authentication Code in C Language that has encryption but no decryption using SHA5 to calculate the HMAC.

The program should include these steps of HMAC:

1. Original Message and text will be used to find the digest function
2. Sender should calculate key and HMAC then send it to receiver with the message included
3. Receiver now recalculates the HMAC using the secret key and message
4. Receiver should compare the sent and calculated HMACs.
5. Receiver can confirm that the message was not altered if the HMACs calculated are the same

Thank You