Created Conversions module to use for the new functions in haskell-cr…

…yptography#106

libsodium-bindings/libsodium-bindings.cabal

@@ -68,6 +68,7 @@ library
     LibSodium.Bindings
     LibSodium.Bindings.AEAD
     LibSodium.Bindings.Comparison
+    LibSodium.Bindings.Conversions
     LibSodium.Bindings.CryptoAuth
     LibSodium.Bindings.CryptoBox
     LibSodium.Bindings.CryptoSign

libsodium-bindings/src/LibSodium/Bindings/Conversions.hs

@@ -0,0 +1,38 @@
+{-# LANGUAGE CApiFFI #-}
+
+-- |
+-- Module: LibSodium.Bindings.Conversions
+-- Description: Sodium Conversions
+-- Copyright: (C) Lemon
+-- License: MIT
+-- Maintainer: [email protected]
+-- Stability: Stable
+-- Portability: GHC only
+module LibSodium.Bindings.Conversions
+  ( -- * Functions
+  ) where
+
+import Foreign
+import Foreign.C
+import Foreign.C.ConstPtr
+
+foreign import capi "sodium.h sodium_bin2base64"
+  sodiumBin2Base64
+    :: ConstPtr CChar
+    -- ^ Resulting conversion to base64 is stored here including C null terminator
+    -> CSize
+    -- ^ Maximum number of bytes allowed to be stored in base64 number when converting
+    -- ^ WARNING: Must be 2 * binLen + 1 in size
+    -- ^ NOTE: This is `const size_t` in sodium
+    -> ConstPtr CUChar
+    -- ^ Decimal numbers to convert to base64
+    -- ^ NOTE: This is `const unsigned char *const` in sodium
+    -> CSize
+    -- ^ Amount of bytes to convert to base64
+    -- ^ NOTE:
+    -- ^ NOTE: This is `const size_t` in sodium
+    -> CInt
+    -- ^ The variant of base64 to use
+    -- ^ NOTE: This is `const int` in sodium
+    -> Ptr CChar
+    -- ^ The result of converting bin to base64