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diff --git a/testsuite/ghdl-issues/issue1421a/aes_pkg.vhdl b/testsuite/ghdl-issues/issue1421a/aes_pkg.vhdl
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+++ b/testsuite/ghdl-issues/issue1421a/aes_pkg.vhdl
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+
+library ieee;
+  use ieee.std_logic_1164.all;
+  use ieee.numeric_std.all;
+
+package aes_pkg is
+
+  type t_usig_1d is array(natural range <>) of unsigned(7 downto 0);
+
+  type t_usig_2d is array(natural range <>, natural range <>) of unsigned(7 downto 0);
+
+  constant C_STATE_ROWS : integer := 2;
+  constant C_STATE_COLS : integer := 2;
+
+  subtype st_word is t_usig_1d(0 to C_STATE_COLS - 1);
+  subtype st_state is t_usig_2d(0 to C_STATE_ROWS - 1, 0 to C_STATE_COLS - 1);
+  subtype st_sbox is t_usig_1d(0 to 255);
+
+  type t_key is array(natural range <>) of st_word;
+
+  function mix_columns (a_in : st_state) return st_state;
+
+end package aes_pkg;
+
+package body aes_pkg is
+
+  -- FIPS 197, 5.1.3 MixColumns() Transformation
+
+  function mix_columns (a_in : st_state) return st_state is
+    variable a_out : st_state;
+  begin
+    for col in 0 to C_STATE_COLS - 1 loop
+      a_out(0, col) := a_in(0, col) xor
+                       a_in(1, col);
+      a_out(1, col) := a_in(0, col) xor
+                       a_in(1, col);
+    end loop;
+    return a_out;
+  end mix_columns;
+end package body;