put support for 13 back in, had to remove some 14+ specific code.

sql/pgsodium--2.0.2--3.0.0.sql

@@ -29,7 +29,8 @@ GRANT USAGE ON SCHEMA @extschema@_masks TO pgsodium_keyiduser;
 
 CREATE OR REPLACE FUNCTION @[email protected]()
   RETURNS text
-  RETURN (SELECT extversion FROM pg_extension WHERE extname = 'pgsodium');
+  AS $$ SELECT extversion FROM pg_extension WHERE extname = 'pgsodium') $$
+  LANGUAGE sql;
 
 -- Internal Key Management
 
@@ -90,7 +91,7 @@ CREATE FUNCTION @[email protected]_key(
   key_context bytea = 'pgsodium',
   expires timestamp = null,
   user_data jsonb = null) RETURNS @[email protected]
-        BEGIN ATOMIC
+        AS $$
         INSERT INTO @[email protected] (key_id, key_context, key_type, expires, comment, user_data)
           VALUES (case when key_id is null then nextval('@[email protected]_key_id_seq'::regclass) else key_id
                   end,
@@ -99,7 +100,7 @@ CREATE FUNCTION @[email protected]_key(
                   expires,
                   comment,
                   user_data) RETURNING *;
-        END;
+        $$ LANGUAGE sql;
 
 -- Deterministic AEAD functions by key uuid
 
@@ -279,20 +280,20 @@ GRANT SELECT ON @[email protected]_rule TO PUBLIC;
 
 
 CREATE FUNCTION @[email protected]_mask(role regrole, source_name text)
-  RETURNS BOOLEAN RETURN (
+  RETURNS boolean AS $$
   SELECT EXISTS(
     SELECT 1
       FROM pg_shseclabel
      WHERE  objoid = role
        AND provider = 'pgsodium'
        AND label ilike 'ACCESS%' || source_name || '%')
-  );
+  $$ LANGUAGE sql;
 
 -- Display all columns of the relation with the masking function (if any)
 CREATE FUNCTION @[email protected]_columns(source_relid oid)
   RETURNS TABLE (attname name, key_id text, key_id_column text,
                  associated_column text, nonce_column text, format_type text)
-BEGIN ATOMIC
+AS $$
   SELECT
   a.attname,
   m.key_id,
@@ -308,7 +309,7 @@ BEGIN ATOMIC
   AND    a.attnum > 0 -- exclude ctid, cmin, cmax
   AND    NOT a.attisdropped
   ORDER BY a.attnum;
-END;
+$$ LANGUAGE sql;
 
 -- get the "select filters" that will decrypt the real data of a table
 CREATE FUNCTION @[email protected]_columns(

sql/pgsodium--3.0.4--3.0.5.sql

@@ -605,13 +605,13 @@ CREATE VIEW pgsodium.mask_columns AS SELECT
 
 CREATE OR REPLACE FUNCTION pgsodium.quote_assoc(text, boolean = false)
 RETURNS text
-BEGIN ATOMIC
+AS $$
     WITH a AS (SELECT array_agg(CASE WHEN $2 THEN
                                     'new.' || quote_ident(trim(v))
                                 ELSE quote_ident(trim(v)) END) as r
-               FROM string_to_table($1, ',') as v)
+               FROM regexp_split_to_table($1, '\s*,\s*') as v)
     SELECT array_to_string(a.r, '::text || ') || '::text' FROM a;
-END;
+$$ LANGUAGE sql;
 
 CREATE OR REPLACE FUNCTION pgsodium.encrypted_columns(relid OID)
 RETURNS TEXT AS

test.sh

@@ -2,7 +2,7 @@
 
 set -e
 
-versions=${1:-14 15}
+versions=${1:-13 14 15}
 
 for version in $versions
 do