SHA1 Hash Generator
This simple tool computes the SHA1 hash of a string to authenticate messages sent between the client and server.
What is SHA1 Hash Algorithm?
In cryptography, SHA-1 is a cryptographically broken but still widely used hash function which takes an input and produces a 160-bit hash value known as a message digest typically rendered as 40 hexadecimal digits.
via Wikipedia
What is SHA-1 hash used for?
SHA-1 hash is used to authenticate messages sent between the client and server during the TLS handshake.