OpenCores
URL https://opencores.org/ocsvn/csa/csa/trunk

Subversion Repositories csa

[/] [csa/] [trunk/] [rtl/] [stream_cypher.v] - Blame information for rev 20

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 20 simon111 
 
2 
 
3 
// this file implement the stream cypher module
4 
 
5 
module stream_cypher(clk,rst_n,en,init,ck,sb,cb);
6 
input                 clk;
7 
input                 rst_n;   // low enable
8 
input                 en;      // hi enable
9 
input                 init;    // hi enable
10 
input  [8 *8-1:0]     ck;
11 
input  [8 *8-1:0]     sb;
12 
output [8 *8-1:0]     cb;
13 
 
14 
// intermediate variable
15 
reg                en_d;
16 
reg    [10*4-1 : 0]A;
17 
reg    [10*4-1 : 0]B;
18 
reg    [4-1    : 0]X;
19 
reg    [4-1    : 0]Y;
20 
reg    [4-1    : 0]Z;
21 
reg    [4-1    : 0]D;
22 
reg    [4-1    : 0]E;
23 
reg    [4-1    : 0]F;
24 
reg                p;
25 
reg                q;
26 
reg                r;
27 
 
28 
wire   [10*4-1 : 0]Ao;
29 
wire   [10*4-1 : 0]Ainit;
30 
wire   [10*4-1 : 0]Bo;
31 
wire   [10*4-1 : 0]Binit;
32 
wire   [4-1    : 0]Xo;
33 
wire   [4-1    : 0]Yo;
34 
wire   [4-1    : 0]Zo;
35 
wire   [4-1    : 0]Do;
36 
wire   [4-1    : 0]Eo;
37 
wire   [4-1    : 0]Fo;
38 
wire               po;
39 
wire               qo;
40 
wire               ro;
41 
 
42 
assign Ainit = {
43 
                4'b0,         4'b0,
44 
        ck[7*4-1:6*4],ck[8*4-1:7*4],
45 
        ck[5*4-1:4*4],ck[6*4-1:5*4],
46 
        ck[3*4-1:2*4],ck[4*4-1:3*4],
47 
        ck[1*4-1:0*4],ck[2*4-1:1*4]
48 
};
49 
 
50 
assign Binit = {
51 
                   4'b0,           4'b0,
52 
        ck[15*4-1:14*4],ck[16*4-1:15*4],
53 
        ck[13*4-1:12*4],ck[14*4-1:13*4],
54 
        ck[11*4-1:10*4],ck[12*4-1:11*4],
55 
        ck[ 9*4-1: 8*4],ck[10*4-1: 9*4]
56 
};
57 
 
58 
always @(posedge clk)
59 
begin
60 
        if(!rst_n)
61 
        begin
62 
                A<= 40'h0000000000;
63 
                B<= 40'h0000000000;
64 
                X<=  8'h00;
65 
                Y<=  8'h00;
66 
                Z<=  8'h00;
67 
                D<=  8'h00;
68 
                E<=  8'h00;
69 
                F<=  8'h00;
70 
                p<=  8'h00;
71 
                q<=  8'h00;
72 
                r<=  8'h00;
73 
                en_d <= 1'h00;
74 
        end
75 
        else
76 
        begin
77 
                en_d <= en;
78 
                if(en_d)
79 
                begin
80 
                        A<=  Ao;
81 
                        B<=  Bo;
82 
                        X<=  Xo;
83 
                        Y<=  Yo;
84 
                        Z<=  Zo;
85 
                        D<=  Do;
86 
                        E<=  Eo;
87 
                        F<=  Fo;
88 
                        p<=  po;
89 
                        q<=  qo;
90 
                        r<=  ro;
91 
 
92 
                end
93 
        end
94 
end
95 
 
96 
 
97 
stream_8bytes b(
98 
                        .init(init)
99 
                       ,.sb(sb)
100 
                       ,.Ai((init)?Ainit:A)
101 
                       ,.Bi((init)?Binit:B)
102 
                       ,.Di((init)?4'b0 :D)
103 
                       ,.Ei((init)?4'b0 :E)
104 
                       ,.Fi((init)?4'b0 :F)
105 
                       ,.Xi((init)?4'b0 :X)
106 
                       ,.Yi((init)?4'b0 :Y)
107 
                       ,.Zi((init)?4'b0 :Z)
108 
                       ,.pi((init)?1'b0 :p)
109 
                       ,.qi((init)?1'b0 :q)
110 
                       ,.ri((init)?1'b0 :r)
111 
 
112 
                       ,.Ao(Ao)
113 
                       ,.Bo(Bo)
114 
                       ,.Do(Do)
115 
                       ,.Eo(Eo)
116 
                       ,.Fo(Fo)
117 
                       ,.Xo(Xo)
118 
                       ,.Yo(Yo)
119 
                       ,.Zo(Zo)
120 
                       ,.po(po)
121 
                       ,.qo(qo)
122 
                       ,.ro(ro)
123 
                       ,.cb(cb)
124 
                );
125 
 
126 
endmodule

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.