?? des.v
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///////////////////////////////////////////////////////////////////////// //////// DES //////// DES Top Level module //////// //////// Author: Rudolf Usselmann //////// rudi@asics.ws //////// ///////////////////////////////////////////////////////////////////////////// //////// Copyright (C) 2001 Rudolf Usselmann //////// rudi@asics.ws //////// //////// 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 SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY //////// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED //////// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS //////// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR //////// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, //////// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES //////// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE //////// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR //////// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF //////// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT //////// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT //////// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE //////// POSSIBILITY OF SUCH DAMAGE. //////// /////////////////////////////////////////////////////////////////////////module des(desOut, desIn, key, decrypt, roundSel, clk);output [63:0] desOut;input [63:0] desIn;input [55:0] key;input decrypt;input [3:0] roundSel;input clk;wire [1:48] K_sub;wire [1:64] IP, FP;reg [1:32] L, R;wire [1:32] Xin;wire [1:32] Lout, Rout;wire [1:32] out;assign Lout = (roundSel == 0) ? IP[33:64] : R;assign Xin = (roundSel == 0) ? IP[01:32] : L;assign Rout = Xin ^ out;assign FP = { Rout, Lout};crp u0( .P(out), .R(Lout), .K_sub(K_sub) );always @(posedge clk) L <= #1 Lout;always @(posedge clk) R <= #1 Rout; // Select a subkey from key.key_sel u1( .K_sub( K_sub ), .K( key ), .roundSel( roundSel ), .decrypt( decrypt ) );// Perform initial permutationassign IP[1:64] = { desIn[06], desIn[14], desIn[22], desIn[30], desIn[38], desIn[46], desIn[54], desIn[62], desIn[04], desIn[12], desIn[20], desIn[28], desIn[36], desIn[44], desIn[52], desIn[60], desIn[02], desIn[10], desIn[18], desIn[26], desIn[34], desIn[42], desIn[50], desIn[58], desIn[00], desIn[08], desIn[16], desIn[24], desIn[32], desIn[40], desIn[48], desIn[56], desIn[07], desIn[15], desIn[23], desIn[31], desIn[39], desIn[47], desIn[55], desIn[63], desIn[05], desIn[13], desIn[21], desIn[29], desIn[37], desIn[45], desIn[53], desIn[61], desIn[03], desIn[11], desIn[19], desIn[27], desIn[35], desIn[43], desIn[51], desIn[59], desIn[01], desIn[09], desIn[17], desIn[25], desIn[33], desIn[41], desIn[49], desIn[57] };// Perform final permutationassign desOut = { FP[40], FP[08], FP[48], FP[16], FP[56], FP[24], FP[64], FP[32], FP[39], FP[07], FP[47], FP[15], FP[55], FP[23], FP[63], FP[31], FP[38], FP[06], FP[46], FP[14], FP[54], FP[22], FP[62], FP[30], FP[37], FP[05], FP[45], FP[13], FP[53], FP[21], FP[61], FP[29], FP[36], FP[04], FP[44], FP[12], FP[52], FP[20], FP[60], FP[28], FP[35], FP[03], FP[43], FP[11], FP[51], FP[19], FP[59], FP[27], FP[34], FP[02], FP[42], FP[10], FP[50], FP[18], FP[58], FP[26], FP[33], FP[01], FP[41], FP[09], FP[49], FP[17], FP[57], FP[25] };endmodule
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