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[/] [csa/] [trunk/] [rtl/] [stream_cypher.v] - Blame information for rev 21

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// this file implement the stream cypher module
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module stream_cypher(clk,rst,en,init,ck,sb,cb);
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input                 clk;
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input                 rst;   // hi enable
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input                 en;      // hi enable
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input                 init;    // hi enable
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input  [8 *8-1:0]     ck;
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input  [8 *8-1:0]     sb;
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output [8 *8-1:0]     cb;
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// intermediate variable
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reg    [10*4-1 : 0]A;
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reg    [10*4-1 : 0]B;
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reg    [4-1    : 0]X;
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reg    [4-1    : 0]Y;
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reg    [4-1    : 0]Z;
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reg    [4-1    : 0]D;
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reg    [4-1    : 0]E;
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reg    [4-1    : 0]F;
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reg                p;
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reg                q;
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reg                r;
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reg    [8 *8-1 : 0]cb;
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wire   [10*4-1 : 0]Ao;
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wire   [10*4-1 : 0]Ainit;
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wire   [10*4-1 : 0]Bo;
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wire   [10*4-1 : 0]Binit;
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wire   [4-1    : 0]Xo;
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wire   [4-1    : 0]Yo;
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wire   [4-1    : 0]Zo;
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wire   [4-1    : 0]Do;
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wire   [4-1    : 0]Eo;
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wire   [4-1    : 0]Fo;
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wire               po;
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wire               qo;
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wire               ro;
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wire   [8 *8-1 : 0]cbo;
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assign Ainit = {
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                4'b0,         4'b0,
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        ck[7*4-1:6*4],ck[8*4-1:7*4],
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        ck[5*4-1:4*4],ck[6*4-1:5*4],
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        ck[3*4-1:2*4],ck[4*4-1:3*4],
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        ck[1*4-1:0*4],ck[2*4-1:1*4]
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};
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assign Binit = {
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                   4'b0,           4'b0,
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        ck[15*4-1:14*4],ck[16*4-1:15*4],
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        ck[13*4-1:12*4],ck[14*4-1:13*4],
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        ck[11*4-1:10*4],ck[12*4-1:11*4],
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        ck[ 9*4-1: 8*4],ck[10*4-1: 9*4]
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};
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always @(posedge clk)
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begin
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        if(rst)
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        begin
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                A<= 40'h0000000000;
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                B<= 40'h0000000000;
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                X<=  8'h00;
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                Y<=  8'h00;
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                Z<=  8'h00;
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                D<=  8'h00;
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                E<=  8'h00;
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                F<=  8'h00;
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                p<=  8'h00;
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                q<=  8'h00;
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                r<=  8'h00;
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        end
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        else
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        begin
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                if(en)
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                begin
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                        cb <= cbo;
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                        A<=  Ao;
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                        B<=  Bo;
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                        X<=  Xo;
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                        Y<=  Yo;
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                        Z<=  Zo;
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                        D<=  Do;
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                        E<=  Eo;
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                        F<=  Fo;
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                        p<=  po;
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                        q<=  qo;
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                        r<=  ro;
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                end
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        end
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end
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stream_8bytes b(
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                        .init(init)
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                       ,.sb(sb)
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                       ,.Ai((init)?Ainit:A)
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                       ,.Bi((init)?Binit:B)
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                       ,.Di((init)?4'b0 :D)
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                       ,.Ei((init)?4'b0 :E)
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                       ,.Fi((init)?4'b0 :F)
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                       ,.Xi((init)?4'b0 :X)
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                       ,.Yi((init)?4'b0 :Y)
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                       ,.Zi((init)?4'b0 :Z)
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                       ,.pi((init)?1'b0 :p)
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                       ,.qi((init)?1'b0 :q)
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                       ,.ri((init)?1'b0 :r)
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                       ,.Ao(Ao)
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                       ,.Bo(Bo)
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                       ,.Do(Do)
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                       ,.Eo(Eo)
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                       ,.Fo(Fo)
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                       ,.Xo(Xo)
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                       ,.Yo(Yo)
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                       ,.Zo(Zo)
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                       ,.po(po)
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                       ,.qo(qo)
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                       ,.ro(ro)
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                       ,.cb(cbo)
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                );
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endmodule

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