This module provides functions to compute 128-bit ``digests'' of arbitrary-length strings or files. The digests are of cryptographic quality: it is very hard, given a digest, to forge a string having that digest. The algorithm used is MD5.

type t = string

The type of digests: 16-character strings.

val string: string -> t

Return the digest of the given string.

val substring: string -> pos:int -> len:int -> t

Digest.substring s ofs len returns the digest of the substring of s starting at character number ofs and containing len characters.

val channel: in_channel -> len:int -> t

Digest.channel ic len reads len characters from channel ic and returns their digest.

val file: string -> t

Return the digest of the file whose name is given.

val output: out_channel -> t -> unit

Write a digest on the given output channel.

val input: in_channel -> t

Read a digest from the given input channel.