Module Cryptokit.Hash

module Hash: sig  end

The Hash module implements unkeyed cryptographic hashes SHA-1 and MD5, also known as message digest functions. Hash functions used in cryptography are characterized as being one-way (given a hash value, it is computationally infeasible to find a text that hashes to this value) and collision-resistant (it is computationally infeasible to find two different texts that hash to the same value). Thus, the hash of a text can be used as a compact replacement for this text for the purposes of ensuring integrity of the text.

val sha1 : unit -> Cryptokit.hash

SHA-1 is the Secure Hash Algorithm revision 1. It is a NIST standard, is widely used, and has no known weaknesses. It produces 160-bit hashes (20 bytes).

val md5 : unit -> Cryptokit.hash

MD5 is an older hash function, producing 128-bit hashes (16 bytes). While popular in many applications, it is considered as potentially slightly weaker than SHA-1.