/////////////////////////////////////////////////////////////////////////                                                             ////////  CRP                                                        ////////  DES Crypt 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  crp(P, R, K_sub);output	[1:32]	P;input	[1:32]	R;input	[1:48]	K_sub;wire	[1:48] E;wire	[1:48] X;wire	[1:32] S;assign E[1:48] = {	R[32], R[1], R[2], R[3], R[4], R[5], R[4], R[5],			R[6], R[7], R[8], R[9], R[8], R[9], R[10], R[11],			R[12], R[13], R[12], R[13], R[14], R[15], R[16],			R[17], R[16], R[17], R[18], R[19], R[20], R[21],			R[20], R[21], R[22], R[23], R[24], R[25], R[24],			R[25], R[26], R[27], R[28], R[29], R[28], R[29],			R[30], R[31], R[32], R[1]};assign X = E ^ K_sub;sbox1 u0( .addr(X[01:06]), .dout(S[01:04]) );sbox2 u1( .addr(X[07:12]), .dout(S[05:08]) );sbox3 u2( .addr(X[13:18]), .dout(S[09:12]) );sbox4 u3( .addr(X[19:24]), .dout(S[13:16]) );sbox5 u4( .addr(X[25:30]), .dout(S[17:20]) );sbox6 u5( .addr(X[31:36]), .dout(S[21:24]) );sbox7 u6( .addr(X[37:42]), .dout(S[25:28]) );sbox8 u7( .addr(X[43:48]), .dout(S[29:32]) );assign P[1:32] = {	S[16], S[7], S[20], S[21], S[29], S[12], S[28],			S[17], S[1], S[15], S[23], S[26], S[5], S[18],			S[31], S[10], S[2], S[8], S[24], S[14], S[32],			S[27], S[3], S[9], S[19], S[13], S[30], S[6],			S[22], S[11], S[4], S[25]};endmodule