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git-svn-id: http://moon:8086/svn/vhdl/trunk@1423 cc03376c-175c-47c8-b038-4cd826a8556b
2021-03-21 11:31:55 +00:00
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+--- ============================================================================
+--
+-- Design unit      :   aes_encryption
+--
+-- File Name        :   aes_encryption.vhd
+--
+-- Purpose          :   Design file
+--
+--
+-- Depends on       :
+--
+-- - Package(s)     :   -
+--
+-- - Module(s)      :   -
+--
+--
+-- Dev. Platform    :   Xilinx ISE 8.1i SP3 / Win32 (W2k SP4)
+--
+-- - Simulator(s)   :   Modelsim XE III 6.0d
+--
+-- - Synthesis      :   Xilinx XST
+--
+-- - Place & Route  :   Xilinx PAR
+--
+--
+-- Errors           :   None known
+--
+--
+-- Limitations      :   None known
+--
+--
+-- Notes            :   -
+--
+--
+-- Author(s)        :   A. Freund (af) <a.freund@dsi-it.de>, 
+--                      M.v.d.Wall (mvdw) <vdwall@dsi-it.de>
+--                      Digitale Signalverabeitung & Informationstechnik GmbH,
+--                      Bremen, Germany
+--
+-- ============================================================================
+--
+-- Revision List:
+--
+-- see SVN logs
+--
+-- ============================================================================
+--
+-- Naming conventions:
+--
+-- - coding style: record-signals for related purposes (Gaisler-style)
+-- - active-low signals are indicated by appending "_n"
+-- - constants are in UPPERCASE
+-- - name parts are separated by "_"
+--
+-- ============================================================================
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+use work.aes_definitions.all;
+use work.aes_common.all;
+use work.aes_column_ops.all;
+use work.aes_row_ops.all;
+
+
+package aes_encryption is
+
+
+	function mix_columns(st : in aes_state_t) return aes_state_t;
+
+	function shift_rows(st : in aes_state_t) return aes_state_t;
+
+
+end aes_encryption;
+
+
+package body aes_encryption is
+
+
+	function mix_columns(st : in aes_state_t) return aes_state_t is
+		type columns_t is array(0 to 3) of column_t;
+		variable v_cols : columns_t;
+		variable v_st : aes_state_t;
+	begin
+		for i in v_cols'range loop
+			v_cols(i) := mix_column(select_column(st, i));
+			v_st := replace_column(v_st, v_cols(i), i);
+		end loop;
+
+		return v_st;
+	end mix_columns;
+
+
+
+
+	function shift_rows(st : in aes_state_t) return aes_state_t is
+		type rows_t is array(0 to 3) of row_t;
+		variable v_rows : rows_t;
+		variable v_st : aes_state_t;
+	begin
+		for i in v_rows'range loop
+			v_rows(i) := shift_row(select_row(st, i), i);
+			v_st := replace_row(v_st, v_rows(i), i);
+		end loop;
+
+		return v_st;
+	end shift_rows;
+
+
+end aes_encryption;