diff --git a/stubs/CoreGenericFunctions.phpstub b/stubs/CoreGenericFunctions.phpstub
index 54bd9d8f27b..720ba46e1d8 100644
--- a/stubs/CoreGenericFunctions.phpstub
+++ b/stubs/CoreGenericFunctions.phpstub
@@ -334,6 +334,22 @@ function fclose(&$stream) : bool
 {
 }
 
+/**
+ * @psalm-pure
+ * @template T as string
+ * @param T $string
+ * @return (T is non-empty-string ? non-empty-string : string)
+ */
+function sodium_bin2base64(string $string, int $id): string
+
+/**
+ * @psalm-pure
+ * @template T as string
+ * @param T $string
+ * @return (T is non-empty-string ? non-empty-string : string)
+ */
+function sodium_bin2hex(string $string): string {}
+
 /**
  * @param string $string
  * @param-out null $string
@@ -1308,9 +1324,21 @@ function base64_decode(string $string, bool $strict = false) {}
  * @psalm-pure
  *
  * @psalm-flow ($string) -> return
+ * @template T as string
+ * @param T $string
+ * @return (T is non-empty-string ? non-empty-string : string)
  */
 function base64_encode(string $string) : string {}
 
+/**
+ * @psalm-pure
+ *
+ * @template T as string
+ * @param T $string
+ * @return (T is non-empty-string ? non-empty-string : string)
+ */
+function bin2hex(string $string): string {}
+
 /**
  * @psalm-pure
  *