module Digest: sig .. end
MD5 message digest.
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. This module should not be
used for secure and sensitive cryptographic applications. For these
kind of applications more recent and 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
Pervasives.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 string : string -> t
Return the digest of the given string.
val substring : string -> int -> 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 : Pervasives.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 to_hex : t -> string
Return the printable hexadecimal representation of the given digest.
val from_hex : string -> t
Convert a hexadecimal representation back into the corresponding digest.
Raise Invalid_argument if the argument is not exactly 32 hexadecimal
characters.
Since 4.00.0