SHA1 Algorithm (+ JavaScript Implementation)

SHA1 (SHA here stands for Secure Hashing Algorithm) is a cryptographic algorithm that belongs to a class of algorithms called cryptographic hash functions. Hash functions take the “message” as input, and churn out a fixed sized hash (called a “message digest”) as output. These functions differ from cryptographic encryption functions both in their intended use cases and their properties.

Encryption functions are used to secure data before transmission. The encrypted message, called ciphertext, is...