1 |
5 |
rudi |
/////////////////////////////////////////////////////////////////////
|
2 |
|
|
//// ////
|
3 |
|
|
//// CRP ////
|
4 |
|
|
//// DES Crypt Module ////
|
5 |
|
|
//// ////
|
6 |
|
|
//// Author: Rudolf Usselmann ////
|
7 |
|
|
//// rudi@asics.ws ////
|
8 |
|
|
//// ////
|
9 |
|
|
/////////////////////////////////////////////////////////////////////
|
10 |
|
|
//// ////
|
11 |
|
|
//// Copyright (C) 2001 Rudolf Usselmann ////
|
12 |
|
|
//// rudi@asics.ws ////
|
13 |
|
|
//// ////
|
14 |
|
|
//// This source file may be used and distributed without ////
|
15 |
|
|
//// restriction provided that this copyright statement is not ////
|
16 |
|
|
//// removed from the file and that any derivative work contains ////
|
17 |
|
|
//// the original copyright notice and the associated disclaimer.////
|
18 |
|
|
//// ////
|
19 |
|
|
//// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ////
|
20 |
|
|
//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ////
|
21 |
|
|
//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ////
|
22 |
|
|
//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ////
|
23 |
|
|
//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ////
|
24 |
|
|
//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ////
|
25 |
|
|
//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ////
|
26 |
|
|
//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ////
|
27 |
|
|
//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ////
|
28 |
|
|
//// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ////
|
29 |
|
|
//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ////
|
30 |
|
|
//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ////
|
31 |
|
|
//// POSSIBILITY OF SUCH DAMAGE. ////
|
32 |
|
|
//// ////
|
33 |
|
|
/////////////////////////////////////////////////////////////////////
|
34 |
|
|
|
35 |
|
|
module crp(P, R, K_sub);
|
36 |
|
|
output [1:32] P;
|
37 |
|
|
input [1:32] R;
|
38 |
|
|
input [1:48] K_sub;
|
39 |
|
|
|
40 |
|
|
wire [1:48] E;
|
41 |
|
|
wire [1:48] X;
|
42 |
7 |
rudi |
wire [1:32] S;
|
43 |
5 |
rudi |
|
44 |
|
|
assign E[1:48] = { R[32], R[1], R[2], R[3], R[4], R[5], R[4], R[5],
|
45 |
|
|
R[6], R[7], R[8], R[9], R[8], R[9], R[10], R[11],
|
46 |
|
|
R[12], R[13], R[12], R[13], R[14], R[15], R[16],
|
47 |
|
|
R[17], R[16], R[17], R[18], R[19], R[20], R[21],
|
48 |
|
|
R[20], R[21], R[22], R[23], R[24], R[25], R[24],
|
49 |
|
|
R[25], R[26], R[27], R[28], R[29], R[28], R[29],
|
50 |
|
|
R[30], R[31], R[32], R[1]};
|
51 |
|
|
|
52 |
|
|
assign X = E ^ K_sub;
|
53 |
|
|
|
54 |
|
|
sbox1 u0( .addr(X[01:06]), .dout(S[01:04]) );
|
55 |
|
|
sbox2 u1( .addr(X[07:12]), .dout(S[05:08]) );
|
56 |
|
|
sbox3 u2( .addr(X[13:18]), .dout(S[09:12]) );
|
57 |
|
|
sbox4 u3( .addr(X[19:24]), .dout(S[13:16]) );
|
58 |
|
|
sbox5 u4( .addr(X[25:30]), .dout(S[17:20]) );
|
59 |
|
|
sbox6 u5( .addr(X[31:36]), .dout(S[21:24]) );
|
60 |
|
|
sbox7 u6( .addr(X[37:42]), .dout(S[25:28]) );
|
61 |
|
|
sbox8 u7( .addr(X[43:48]), .dout(S[29:32]) );
|
62 |
|
|
|
63 |
|
|
assign P[1:32] = { S[16], S[7], S[20], S[21], S[29], S[12], S[28],
|
64 |
|
|
S[17], S[1], S[15], S[23], S[26], S[5], S[18],
|
65 |
|
|
S[31], S[10], S[2], S[8], S[24], S[14], S[32],
|
66 |
|
|
S[27], S[3], S[9], S[19], S[13], S[30], S[6],
|
67 |
|
|
S[22], S[11], S[4], S[25]};
|
68 |
|
|
|
69 |
|
|
endmodule
|