Internal switch to Crypto::Secret

src/sodium/crypto_box.cr

@@ -22,10 +22,12 @@ module Sodium
       # Precalculate key for later use.
       # Large speed gains with small data sizes and many messages.
       # Small speed gains with large data sizes or few messages.
-      if LibSodium.crypto_box_beforenm(@key, @public_key.to_slice, @secret_key.to_slice) != 0
+      @secret_key.key.readonly do |skslice|
+        if LibSodium.crypto_box_beforenm(@key, @public_key.to_slice, skslice) != 0
           raise Error.new("crypto_box_beforenm")
         end
       end
+    end
 
     # Encrypts data and returns {ciphertext, nonce}
     def encrypt(src)

src/sodium/kdf.cr

@@ -82,8 +82,8 @@ module Sodium
 
       subkey = SecureBuffer.new subkey_size
       subkey.readwrite do |sub_slice|
-        @sbuf.readonly do
+        @sbuf.readonly do |sslice|
-          if (ret = LibSodium.crypto_kdf_derive_from_key(sub_slice, sub_slice.bytesize, subkey_id, context, self.to_slice)) != 0
+          if (ret = LibSodium.crypto_kdf_derive_from_key(sub_slice, sub_slice.bytesize, subkey_id, context, sslice)) != 0
             raise Sodium::Error.new("crypto_kdf_derive_from_key returned #{ret} (subkey size is probably out of range)")
           end
         end

src/sodium/secret_box.cr

@@ -63,8 +63,8 @@ module Sodium
       nonce ||= Nonce.random
 
       nonce.used!
-      r = @key.readonly do
+      r = @key.readonly do |kslice|
-        LibSodium.crypto_secretbox_easy(dst, src, src.bytesize, nonce.to_slice, @key)
+        LibSodium.crypto_secretbox_easy(dst, src, src.bytesize, nonce.to_slice, kslice)
       end
       raise Sodium::Error.new("crypto_secretbox_easy") if r != 0
       {dst, nonce}