Hash algorithms in C and OCaml

Digestif is a toolbox which implements hashes:

• SHA1
• SHA224
• SHA256
• SHA384
• SHA512
• BLAKE2B
• BLAKE2S
• RIPEMD160

Digestif uses a trick about linking and let the end-user to choose which implementation he wants to use. We provide 2 implementations:

• C implementation with digestif.c
• OCaml implementation with digestif.ocaml

Both are well-tested. However, OCaml implementation is slower than the C implementation.

API

For each hash, we implement the same API which is referentially transparent. Then, on the top of these, we reflect functions (like digesti or hmaci) with GADT - however, conversion from GADT to hash type is not possible (but you can destruct GADT to a string).

Build Requirements

• OCaml >= 4.03.0 (may be less but need test)
• base-bytes meta-package
• Bigarray module (provided by the standard library of OCaml)
• dime to build the project

If you want to compile the test program, you need:

• alcotest

Credits

This work is from the nocrypto library and the Vincent hanquez's work in ocaml-sha.

All credits appear in the begin of files and this library is motivated by two reasons:

• delete the dependancy with nocrypto if you don't use the encryption (and common) part
• aggregate all hashes functions in one library