anchor.diff:  sign_verify_detached(SIG, M, PK) ->
       enacl_nif:crypto_sign_verify_detached(SIG, M, PK).
   
  --type sign_state() :: reference().
   
   %% @doc sign_init/0 initialize a multi-part signature state.
   %%
  
positive.code: 
  %% Internal verification of the system
  -export([verify/0]).
  
  
  
  
negative.code: %% This function generates a hash of the message using a key. The hash size is
  %% either 16, 32 or 64 bytes
  %% @end
  -spec generichash(generichash_bytes(), iodata(), binary()) -> binary().
  generichash(HashSize, Message, Key) ->
      enacl_nif:crypto_generichash(HashSize, Message, Key).
  