description

SHA is a cryptographic hash function. SHA1 implements the second implementation that produce a 160 bit digest from a message. SHA256 implements newer version that produce 256 bits digest. SHA512 implement 512 bits digest

This provide a interface for OCaml program to use SHA1, SHA256 and SHA512 functions.

Sha modules are now available through debian packaging system, courtesy of Eric Cooper. just install the package libsha-ocaml-dev using your favorite dpkg tools (apt-get, aptitute, ...).

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Thoses package contains multiple SHA implementation:

Thoses versions contains only SHA1:

documentation

The interface is similar of the MD5 Digest available in OCaml standard library here.

You can turn a digest into a printable string through Sha1.to_hex

  • Sha1.string : string -> t
  • Sha1.substring : string -> int -> int -> t
  • Sha1.channel : in_channel -> int -> t
  • Sha1.file : string -> t
  • Sha1.input : in_channel -> t
  • Sha1.output : out_channel -> t -> unit
  • Sha1.to_hex : t -> string

The Sha256 and Sha512 interface are absolutely the same (with Sha256/512 instead of Sha1 ;))

Changelog
  • 1.5: 2 Makefiles fixes (Florent Monnier)
  • 1.4: Reduce code duplication by using a functor
  • 1.3: implement SHA512.
  • 1.2: lots of optimisations for SHA1.
  • 1.1: implement SHA256.
  • 1.0: Lot of performance tweaking. Misc fixes.
  • 0.9: Tweak sha1 algorithm to be faster, using linux kernel SHA1 code with some unrolling inspiration from GNU coreutils. sha1sum become only 2 slower than coreutils sha1sum. more tweak to come.
  • 0.8: Finish implement sha1sum (add check mode), now almost equivalent of the C sha1sum
  • 0.7: Improve performance using an imperative algorithm for channel and switch to -O2 for C part.
  • 0.6: Add small sha1sum program equivalent to C sha1sum for single use.
  • 0.5: Hide low level function, update now take an offset argument. add high level function, similar to ones available in MD5 Digest.
  • 0.4: Rename some stubs function, and few type renaming.
  • 0.3: Use direct caml heap to store the sha1_ctx object instead of mallocing it.
  • 0.2: Cleanup, fix memory leak, add unit testing, build native and bytecode libraries.
  • 0.1: initial implementation.