Subversion Repositories aes_decrypt_fpga

////////////////////////////////////////////////////////////////// ////

////                                                                                                                            ////

//// AES Decryption Core for FPGA                                                                       ////

////                                                                                                                            ////

//// This file is part of the AES Decryption Core for FPGA project      ////

//// http://www.opencores.org/cores/xxx/                                                        ////

////                                                                                                                            ////

//// Description                                                                                                        ////

//// Implementation of  AES Decryption Core for FPGA according to       ////

//// core specification document.                                                                       ////

////                                                                                                                            ////

//// To Do:                                                                                                             ////

//// -                                                                                                                          ////

////                                                                                                                            ////

//// Author(s):                                                                                                         ////

//// - scheng, schengopencores@opencores.org                                            ////

////                                                                                                                            ////

//////////////////////////////////////////////////////////////////////

////                                                                                                                            ////

//// Copyright (C) 2009 Authors and OPENCORES.ORG                                       ////

////                                                                                                                            ////

//// This source file may be used and distributed without                       ////

//// restriction provided that this copyright statement is not          ////

//// removed from the file and that any derivative work contains        ////

//// the original copyright notice and the associated disclaimer.       ////

////                                                                                                                            ////

//// This source file is free software; you can redistribute it         ////

//// and/or modify it under the terms of the GNU Lesser General         ////

//// Public License as published by the Free Software Foundation;       ////

//// either version 2.1 of the License, or (at your option) any         ////

//// later version.                                                                                             ////

////                                                                                                                            ////

//// This source is distributed in the hope that it will be             ////

//// useful, but WITHOUT ANY WARRANTY; without even the implied         ////

//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR            ////

//// PURPOSE. See the GNU Lesser General Public License for more        ////

//// details.                                                                                                           ////

////                                                                                                                            ////

//// You should have received a copy of the GNU Lesser General          ////

//// Public License along with this source; if not, download it         ////

//// from http://www.opencores.org/lgpl.shtml                                           ////

////                                                                                                                            //// ///

///////////////////////////////////////////////////////////////////

////                                                                                                                            ////

//// Wrapper for 128-bit AES decryption                                                         ////

////                                                                                                                            ////

////////////////////////////////////////////////////////////////////////

module aes_decrypt128(

        input   [0:127] kt,

        input   kt_vld,         // Active high input informing key expander that a valid new key is present at kt.

        output  kt_rdy,         // Active high output indicates decryptor ready to accept new key.

        input   [0:127] ct,     // Ciphertext input

        input   ct_vld,         // Active high input indicates a valid ciphertext present on ct.

        output  ct_rdy,         // Active high output indicates decryptor ready to accept new ct.

        output  [0:127] pt,     // Plaintext output

        output  pt_vld,         // Active high output indicates valid plaintext available on pt.

        input   clk,

        input   rst

        );

        // Decryptor side

        wire    [0:127] rkey_decrypt;

        wire    rkey_vld_decrypt;

        wire    next_rkey_decrypt;

        // Key Expander side

        wire    [0:127] rkey_keyexp;

        wire    rkey_vld_keyexp;

        (* KEEP_HIRARACHY = "yes" *) KschBuffer KschBuffer_u(.rkey_in(rkey_keyexp),

                                                        .rkey_vld_in(rkey_vld_keyexp),

                                                        .rkey_out(rkey_decrypt),

                                                        .rkey_vld_out(rkey_vld_decrypt),

                                                        .next_rkey(next_rkey_decrypt),

                                                        .klen_sel(2'b00),

                                                        .clk(clk),

                                                        .rst(rst)

                                                        );

        (* KEEP_HIRARACHY = "yes" *) KeyExpand128 KeyExpand128_u(

                                                        .kt(kt),

                                                        .kt_vld(kt_vld),

                                                        .kt_rdy(kt_rdy),

                                                        .rkey(rkey_keyexp),

                                                        .rkey_vld(rkey_vld_keyexp),

                                                        .rkey_last(),

                                                        .clk(clk),

                                                        .rst(rst)

                                                        );

        (* KEEP_HIRARACHY = "yes" *) decrypt decrypt_u( .ct(ct),

                                        .ct_vld(ct_vld),

                                        .ct_rdy(ct_rdy),

                                        .rkey(rkey_decrypt),

                                        .rkey_vld(rkey_vld_decrypt),

                                        .next_rkey(next_rkey_decrypt),

                                        .pt(pt),

                                        .pt_vld(pt_vld),

                                        .klen_sel(2'b00),

                                        .clk(clk),

                                        .rst(rst)

                                        );

endmodule