github.com/sergeymakinen/go-crypt (go): Package crypt implements a basic interface to validate crypt(3) hashes.  Validation of any particular hash requires the prior registration of a check function. Registration is typically automatic as a side effect of initializing that hash's package so that, to validate an Argon2 has, it suffices to have  in a program's main package. The _ means to import a package purely for its initialization side effects.
Keywords: crypt|crypto|generator|go|golang|hash|validator