NAME

       Digest - MD5 message digest.

Module

       Module   Digest

Documentation

       Module Digest
        : sig end

       MD5 message digest.

       This module provides functions to compute 128-bit 'digests' of arbitrary-length strings or
       files. The algorithm used is MD5.

       The MD5 hash function is not cryptographically secure.  Hence, this module should  not  be
       used  for security-sensitive applications.  More recent, stronger cryptographic primitives
       should be used instead.

       type t = string

       The type of digests: 16-character strings.

       val compare : t -> t -> int

       The comparison function for 16-character digest, with the same  specification  as  compare
       and  the implementation shared with String.compare . Along with the type t , this function
       compare allows the module Digest to be passed as argument to  the  functors  Set.Make  and
       Map.Make .

       Since 4.00.0

       val equal : t -> t -> bool

       The equal function for 16-character digest.

       Since 4.03.0

       val string : string -> t

       Return the digest of the given string.

       val bytes : bytes -> t

       Return the digest of the given byte sequence.

       Since 4.02.0

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

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

       val subbytes : bytes -> int -> int -> t

       Digest.subbytes s ofs len returns the digest of the subsequence of s starting at index ofs
       and containing len bytes.

       Since 4.02.0

       val channel : in_channel -> int -> t

       If  len  is  nonnegative,  Digest.channel  ic len reads len characters from channel ic and
       returns their  digest,  or  raises  End_of_file  if  end-of-file  is  reached  before  len
       characters  are read.  If len is negative, Digest.channel ic len reads all characters from
       ic until end-of-file is reached and return 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.

       val to_hex : t -> string

       Return the printable hexadecimal representation of the given digest.

       Raises Invalid_argument if the argument is not exactly 16 bytes.

       val from_hex : string -> t

       Convert a hexadecimal representation back into the corresponding digest.

       Since 4.00.0

       Raises Invalid_argument if the argument is not exactly 32 hexadecimal characters.