cryptography ip-cores in vhdl / verilog
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  1. -- ======================================================================
  2. -- DES encryption/decryption
  3. -- package file with functions
  4. -- Copyright (C) 2007 Torsten Meissner
  5. -------------------------------------------------------------------------
  6. -- This program is free software; you can redistribute it and/or modify
  7. -- it under the terms of the GNU General Public License as published by
  8. -- the Free Software Foundation; either version 2 of the License, or
  9. -- (at your option) any later version.
  10. -- This program is distributed in the hope that it will be useful,
  11. -- but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13. -- GNU General Public License for more details.
  14. -- You should have received a copy of the GNU General Public License
  15. -- along with this program; if not, write to the Free Software
  16. -- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  17. -- ======================================================================
  18. library ieee;
  19. use ieee.std_logic_1164.all;
  20. use ieee.numeric_std.all;
  21. package des_pkg is
  22. component des is
  23. generic (
  24. design_type : string := "ITER"
  25. );
  26. port (
  27. reset_i : in std_logic; -- async reset
  28. clk_i : in std_logic; -- clock
  29. mode_i : in std_logic; -- des-modus: 0 = encrypt, 1 = decrypt
  30. key_i : in std_logic_vector(0 to 63); -- key input
  31. data_i : in std_logic_vector(0 to 63); -- data input
  32. valid_i : in std_logic; -- input key/data valid
  33. accept_o : out std_logic; -- input accept
  34. data_o : out std_logic_vector(0 to 63); -- data output
  35. valid_o : out std_logic; -- output data valid flag
  36. accept_i : in std_logic -- output accept
  37. );
  38. end component des;
  39. type ip_matrix is array (0 to 63) of natural range 0 to 63;
  40. constant ip_table : ip_matrix := (57, 49, 41, 33, 25, 17, 9, 1,
  41. 59, 51, 43, 35, 27, 19, 11, 3,
  42. 61, 53, 45, 37, 29, 21, 13, 5,
  43. 63, 55, 47, 39, 31, 23, 15, 7,
  44. 56, 48, 40, 32, 24, 16, 8, 0,
  45. 58, 50, 42, 34, 26, 18, 10, 2,
  46. 60, 52, 44, 36, 28, 20, 12, 4,
  47. 62, 54, 46, 38, 30, 22, 14, 6);
  48. constant ipn_table : ip_matrix := (39, 7, 47, 15, 55, 23, 63, 31,
  49. 38, 6, 46, 14, 54, 22, 62, 30,
  50. 37, 5, 45, 13, 53, 21, 61, 29,
  51. 36, 4, 44, 12, 52, 20, 60, 28,
  52. 35, 3, 43, 11, 51, 19, 59, 27,
  53. 34, 2, 42, 10, 50, 18, 58, 26,
  54. 33, 1, 41, 9, 49, 17, 57, 25,
  55. 32, 0, 40, 8, 48, 16, 56, 24);
  56. type e_matrix is array (0 to 47) of natural range 0 to 31;
  57. constant e_table : e_matrix := (31, 0, 1, 2, 3, 4,
  58. 3, 4, 5, 6, 7, 8,
  59. 7, 8, 9, 10, 11, 12,
  60. 11, 12, 13, 14, 15, 16,
  61. 15, 16, 17, 18, 19, 20,
  62. 19, 20, 21, 22, 23, 24,
  63. 23, 24, 25, 26, 27, 28,
  64. 27, 28, 29, 30, 31, 0);
  65. type s_matrix is array (0 to 3, 0 to 15) of integer range 0 to 15;
  66. constant s1_table : s_matrix := (0 => (14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7),
  67. 1 => ( 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8),
  68. 2 => ( 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0),
  69. 3 => (15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13));
  70. constant s2_table : s_matrix := (0 => (15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10),
  71. 1 => ( 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5),
  72. 2 => ( 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15),
  73. 3 => (13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9));
  74. constant s3_table : s_matrix := (0 => (10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8),
  75. 1 => (13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1),
  76. 2 => (13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7),
  77. 3 => ( 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12));
  78. constant s4_table : s_matrix := (0 => ( 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15),
  79. 1 => (13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9),
  80. 2 => (10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4),
  81. 3 => ( 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14));
  82. constant s5_table : s_matrix := (0 => ( 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9),
  83. 1 => (14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6),
  84. 2 => ( 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14),
  85. 3 => (11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3));
  86. constant s6_table : s_matrix := (0 => (12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11),
  87. 1 => (10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8),
  88. 2 => ( 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6),
  89. 3 => ( 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13));
  90. constant s7_table : s_matrix := (0 => ( 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1),
  91. 1 => (13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6),
  92. 2 => ( 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2),
  93. 3 => ( 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12));
  94. constant s8_table : s_matrix := (0 => (13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7),
  95. 1 => ( 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2),
  96. 2 => ( 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8),
  97. 3 => ( 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11));
  98. type pc_matrix is array (0 to 27) of natural range 0 to 63;
  99. constant pc1c_table : pc_matrix := (56, 48, 40, 32, 24, 16, 8,
  100. 0, 57, 49, 41, 33, 25, 17,
  101. 9, 1, 58, 50, 42, 34, 26,
  102. 18, 10, 2, 59, 51, 43, 35);
  103. constant pc1d_table : pc_matrix := (62, 54, 46, 38, 30, 22, 14,
  104. 6, 61, 53, 45, 37, 29, 21,
  105. 13, 5, 60, 52, 44, 36, 28,
  106. 20, 12, 4, 27, 19, 11, 3);
  107. type p_matrix is array (0 to 31) of natural range 0 to 31;
  108. constant p_table : p_matrix := (15, 6, 19, 20,
  109. 28, 11, 27, 16,
  110. 0, 14, 22, 25,
  111. 4, 17, 30, 9,
  112. 1, 7, 23, 13,
  113. 31, 26, 2, 8,
  114. 18, 12, 29, 5,
  115. 21, 10, 3, 24);
  116. type pc2_matrix is array (0 to 47) of natural range 0 to 63;
  117. constant pc2_table : pc2_matrix := (13, 16, 10, 23, 0, 4,
  118. 2, 27, 14, 5, 20, 9,
  119. 22, 18, 11, 3, 25, 7,
  120. 15, 6, 26, 19, 12, 1,
  121. 40, 51, 30, 36, 46, 54,
  122. 29, 39, 50, 44, 32, 47,
  123. 43, 48, 38, 55, 33, 52,
  124. 45, 41, 49, 35, 28, 31);
  125. function ip ( input_vector : std_logic_vector(0 to 63) ) return std_logic_vector;
  126. function ipn ( input_vector : std_logic_vector(0 to 63) ) return std_logic_vector;
  127. function e (input_vector : std_logic_vector(0 to 31) ) return std_logic_vector;
  128. function p (input_vector : std_logic_vector(0 to 31) ) return std_logic_vector;
  129. function s (input_vector : std_logic_vector(0 to 5); s_table : s_matrix ) return std_logic_vector;
  130. function f (input_r : std_logic_vector(0 to 31); input_key : std_logic_vector(0 to 47) ) return std_logic_vector;
  131. function pc1_c ( input_vector : std_logic_vector(0 to 63) ) return std_logic_vector;
  132. function pc1_d ( input_vector : std_logic_vector(0 to 63) ) return std_logic_vector;
  133. function pc2 ( input_vector : std_logic_vector(0 to 55) ) return std_logic_vector;
  134. end package des_pkg;
  135. package body des_pkg is
  136. function ip ( input_vector : std_logic_vector(0 to 63) ) return std_logic_vector is
  137. variable result : std_logic_vector(0 to 63);
  138. begin
  139. for index IN 0 to 63 loop
  140. result( index ) := input_vector( ip_table( index ) );
  141. end loop;
  142. return result;
  143. end function ip;
  144. function ipn ( input_vector : std_logic_vector(0 to 63) ) return std_logic_vector is
  145. variable result : std_logic_vector(0 to 63);
  146. begin
  147. for index IN 0 to 63 loop
  148. result( index ) := input_vector( ipn_table( index ) );
  149. end loop;
  150. return result;
  151. end function ipn;
  152. function e (input_vector : std_logic_vector(0 to 31) ) return std_logic_vector is
  153. variable result : std_logic_vector(0 to 47);
  154. begin
  155. for index IN 0 to 47 loop
  156. result( index ) := input_vector( e_table( index ) );
  157. end loop;
  158. return result;
  159. end function e;
  160. function s ( input_vector : std_logic_vector(0 to 5); s_table : s_matrix ) return std_logic_vector is
  161. variable int : std_logic_vector(0 to 1);
  162. variable i : integer range 0 to 3;
  163. variable j : integer range 0 to 15;
  164. variable result : std_logic_vector(0 to 3);
  165. begin
  166. int := input_vector( 0 ) & input_vector( 5 );
  167. i := to_integer( unsigned( int ) );
  168. j := to_integer( unsigned( input_vector( 1 to 4) ) );
  169. result := std_logic_vector( to_unsigned( s_table( i, j ), 4 ) );
  170. return result;
  171. end function s;
  172. function p (input_vector : std_logic_vector(0 to 31) ) return std_logic_vector is
  173. variable result : std_logic_vector(0 to 31);
  174. begin
  175. for index IN 0 to 31 loop
  176. result( index ) := input_vector( p_table( index ) );
  177. end loop;
  178. return result;
  179. end function p;
  180. function f (input_r : std_logic_vector(0 to 31); input_key : std_logic_vector(0 to 47) ) return std_logic_vector is
  181. variable intern : std_logic_vector(0 to 47);
  182. variable result : std_logic_vector(0 to 31);
  183. begin
  184. intern := e( input_r ) xor input_key;
  185. result := p( s( intern(0 to 5), s1_table ) & s( intern(6 to 11), s2_table ) & s( intern(12 to 17), s3_table ) &
  186. s( intern(18 to 23), s4_table ) & s( intern(24 to 29), s5_table ) & s( intern(30 to 35), s6_table ) &
  187. s( intern(36 to 41), s7_table ) & s( intern(42 to 47), s8_table ) );
  188. return result;
  189. end function f;
  190. function pc1_c ( input_vector : std_logic_vector(0 to 63) ) return std_logic_vector is
  191. variable result : std_logic_vector(0 to 27);
  192. begin
  193. for index IN 0 to 27 loop
  194. result( index ) := input_vector( pc1c_table( index ) );
  195. end loop;
  196. return result;
  197. end function pc1_c;
  198. function pc1_d ( input_vector : std_logic_vector(0 to 63) ) return std_logic_vector is
  199. variable result : std_logic_vector(0 to 27);
  200. begin
  201. for index IN 0 to 27 loop
  202. result( index ) := input_vector( pc1d_table( index ) );
  203. end loop;
  204. return result;
  205. end function pc1_d;
  206. function pc2 ( input_vector : std_logic_vector(0 to 55) ) return std_logic_vector is
  207. variable result : std_logic_vector(0 to 47);
  208. begin
  209. for index IN 0 to 47 loop
  210. result( index ) := input_vector( pc2_table( index ) );
  211. end loop;
  212. return result;
  213. end function pc2;
  214. end package body des_pkg;