diff options
Diffstat (limited to 'src/rtl/aes_inv_sbox.v')
| -rw-r--r-- | src/rtl/aes_inv_sbox.v | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/src/rtl/aes_inv_sbox.v b/src/rtl/aes_inv_sbox.v index 68642db..807f397 100644 --- a/src/rtl/aes_inv_sbox.v +++ b/src/rtl/aes_inv_sbox.v @@ -44,13 +44,22 @@ module aes_inv_sbox( //---------------------------------------------------------------- - // Wires. + // The inverse sbox array. //---------------------------------------------------------------- wire [7 : 0] inv_sbox [0 : 255]; //---------------------------------------------------------------- - // Concurrent assignments for ports. + // Four parallel muxes. + //---------------------------------------------------------------- + assign new_sword[31 : 24] = inv_sbox[sword[31 : 24]]; + assign new_sword[23 : 16] = inv_sbox[sword[23 : 16]]; + assign new_sword[15 : 08] = inv_sbox[sword[15 : 08]]; + assign new_sword[07 : 00] = inv_sbox[sword[07 : 00]]; + + + //---------------------------------------------------------------- + // Creating the contents of the array. //---------------------------------------------------------------- assign inv_sbox[8'h00] = 8'h52; assign inv_sbox[8'h01] = 8'h09; @@ -309,11 +318,6 @@ module aes_inv_sbox( assign inv_sbox[8'hfe] = 8'h0c; assign inv_sbox[8'hff] = 8'h7d; - assign new_sword[31 : 24] = inv_sbox[sword[31 : 24]]; - assign new_sword[23 : 16] = inv_sbox[sword[23 : 16]]; - assign new_sword[15 : 08] = inv_sbox[sword[15 : 08]]; - assign new_sword[07 : 00] = inv_sbox[sword[07 : 00]]; - endmodule // aes_inv_sbox //====================================================================== |