jens
73cfd45401
git-svn-id: http://moon:8086/svn/vhdl/trunk@1423 cc03376c-175c-47c8-b038-4cd826a8556b
111 lines
2.5 KiB
VHDL
111 lines
2.5 KiB
VHDL
--- ============================================================================
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--
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-- Design unit : aes_encryption
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--
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-- File Name : aes_encryption.vhd
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--
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-- Purpose : Design file
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--
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--
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-- Depends on :
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--
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-- - Package(s) : -
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--
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-- - Module(s) : -
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--
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--
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-- Dev. Platform : Xilinx ISE 8.1i SP3 / Win32 (W2k SP4)
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--
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-- - Simulator(s) : Modelsim XE III 6.0d
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--
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-- - Synthesis : Xilinx XST
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--
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-- - Place & Route : Xilinx PAR
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--
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--
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-- Errors : None known
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--
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--
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-- Limitations : None known
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--
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--
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-- Notes : -
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--
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--
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-- Author(s) : A. Freund (af) <a.freund@dsi-it.de>,
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-- M.v.d.Wall (mvdw) <vdwall@dsi-it.de>
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-- Digitale Signalverabeitung & Informationstechnik GmbH,
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-- Bremen, Germany
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--
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-- ============================================================================
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--
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-- Revision List:
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--
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-- see SVN logs
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--
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-- ============================================================================
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--
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-- Naming conventions:
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--
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-- - coding style: record-signals for related purposes (Gaisler-style)
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-- - active-low signals are indicated by appending "_n"
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-- - constants are in UPPERCASE
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-- - name parts are separated by "_"
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--
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-- ============================================================================
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library ieee;
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use ieee.std_logic_1164.all;
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use work.aes_definitions.all;
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use work.aes_common.all;
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use work.aes_column_ops.all;
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use work.aes_row_ops.all;
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package aes_encryption is
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function mix_columns(st : in aes_state_t) return aes_state_t;
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function shift_rows(st : in aes_state_t) return aes_state_t;
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end aes_encryption;
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package body aes_encryption is
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function mix_columns(st : in aes_state_t) return aes_state_t is
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type columns_t is array(0 to 3) of column_t;
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variable v_cols : columns_t;
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variable v_st : aes_state_t;
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begin
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for i in v_cols'range loop
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v_cols(i) := mix_column(select_column(st, i));
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v_st := replace_column(v_st, v_cols(i), i);
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end loop;
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return v_st;
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end mix_columns;
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function shift_rows(st : in aes_state_t) return aes_state_t is
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type rows_t is array(0 to 3) of row_t;
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variable v_rows : rows_t;
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variable v_st : aes_state_t;
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begin
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for i in v_rows'range loop
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v_rows(i) := shift_row(select_row(st, i), i);
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v_st := replace_row(v_st, v_rows(i), i);
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end loop;
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return v_st;
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end shift_rows;
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end aes_encryption;
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