Init. Implemented only password hashing functions

Project.toml

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+name = "Sodium"
+uuid = "04b35f30-b1d3-48e3-a9a8-b40e01b02b62"
+authors = ["nixo <nicolo@nixo.xyz>"]
+version = "0.1.0"

src/Sodium.jl

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+module Sodium
+
+# BinaryBuilder builder has dozen of dependencies, it's extremely complex and
+# does nothing more than guix.
+const lib = "libsodium.so"
+
+# crypto_pwhash_str is 2x fast if sodium has been initalized
+# So remember to init it before using crypto functions
+"""Starts libsodium. Makes crypto_pwhash functions fasters,
+so you need to call it.
+
+Returns true if success, false else"""
+sodium_init() = if ccall((:sodium_init,lib),Int,()) != -1
+    @info "Sodium initialized"
+else
+    @error "Could not init libsodium"
+end
+
+const crypto_pwhash_STRBYTES = Ref(Csize_t(0))
+const crypto_pwhash_OPSLIMIT_INTERACTIVE = Ref(Csize_t(0))
+const crypto_pwhash_OPSLIMIT_MODERATE = Ref(Csize_t(0))
+const crypto_pwhash_OPSLIMIT_SENSITIVE = Ref(Csize_t(0))
+const crypto_pwhash_MEMLIMIT_INTERACTIVE = Ref(Csize_t(0))
+const crypto_pwhash_MEMLIMIT_MODERATE = Ref(Csize_t(0))
+const crypto_pwhash_MEMLIMIT_SENSITIVE = Ref(Csize_t(0))
+
+function __init__()
+    sodium_init()
+    crypto_pwhash_STRBYTES[] = ccall((:crypto_pwhash_strbytes,lib),Csize_t,())
+
+    crypto_pwhash_OPSLIMIT_INTERACTIVE[] =
+        ccall((:crypto_pwhash_opslimit_interactive,lib),Csize_t,())
+    crypto_pwhash_MEMLIMIT_INTERACTIVE[] =
+        ccall((:crypto_pwhash_memlimit_interactive,lib),Csize_t,())
+
+    crypto_pwhash_OPSLIMIT_MODERATE[] =
+        ccall((:crypto_pwhash_opslimit_moderate,lib),Csize_t,())
+    crypto_pwhash_MEMLIMIT_MODERATE[] =
+        ccall((:crypto_pwhash_memlimit_moderate,lib),Csize_t,())
+
+    crypto_pwhash_OPSLIMIT_SENSITIVE[] =
+        ccall((:crypto_pwhash_opslimit_sensitive,lib),Csize_t,())
+    crypto_pwhash_MEMLIMIT_SENSITIVE[] =
+        ccall((:crypto_pwhash_memlimit_sensitive,lib),Csize_t,())
+end
+
+"See the libsodium documentation for info"
+function crypto_pwhash_str(password::AbstractString,
+                           opslimit = crypto_pwhash_OPSLIMIT_SENSITIVE[],
+                           memlimit = crypto_pwhash_MEMLIMIT_SENSITIVE[])
+    hashed = zeros(UInt8, crypto_pwhash_STRBYTES[])
+    if ccall((:crypto_pwhash_str, lib), Int,
+             (Ref{UInt8}, Cstring, Int, Csize_t, Csize_t),
+             hashed, password, length(password), opslimit, memlimit) == 0
+        let s = String(hashed)
+            return s[1:(findfirst('\0', s)-1)]
+        end
+    else
+        @error "OOM error"
+    end
+end
+
+"See the libsodium documentation for info"
+function crypto_pwhash_str_verify(password::String, hashed::String)
+    ccall((:crypto_pwhash_str_verify, lib), Int,
+          (Cstring, Cstring, Int),
+          hashed, password, length(password)) == 0
+end
+
+"returns an unpredictable value between 0 and 0xffffffff (included)"
+randombyte() = ccall((:randombytes_random, lib), UInt32, ())
+
+export sodium_init, crypto_pwhash_str, crypto_pwhash_str_verify, randombyte
+
+end # module