Module Import0.Digest
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.
val compare : t -> t -> int
The comparison function for 16-character digest, with the same specification as
Stdlib.compare
and the implementation shared withString.compare
. Along with the typet
, this functioncompare
allows the moduleDigest
to be passed as argument to the functorsSet
.Make andMap
.Make.- since
- 4.00.0
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 ofs
starting at indexofs
and containinglen
characters.
val subbytes : bytes -> int -> int -> t
Digest.subbytes s ofs len
returns the digest of the subsequence ofs
starting at indexofs
and containinglen
bytes.- since
- 4.02.0
val channel : Stdlib.in_channel -> int -> t
If
len
is nonnegative,Digest.channel ic len
readslen
characters from channelic
and returns their digest, or raisesEnd_of_file
if end-of-file is reached beforelen
characters are read. Iflen
is negative,Digest.channel ic len
reads all characters fromic
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 : Stdlib.out_channel -> t -> unit
Write a digest on the given output channel.
val input : Stdlib.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. Raise
Invalid_argument
if the argument is not exactly 16 bytes.
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