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// this module is used to computer a key
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// this module is used to computer a key
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// author: Simon panti
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// author: Simon panti
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// mengxipeng@gmail.com
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// mengxipeng@gmail.com
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// refer:
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// refer:
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// cas.c in vlc opensource project
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// cas.c in vlc opensource project
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// this module implement the function csa_ComputeKey
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// this module implement the function csa_ComputeKey
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// and cw accord to ck
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// and cw accord to ck
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// key accord to kk;
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// key accord to kk;
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//
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//
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module key_computer(cw,key);
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module key_computer(cw,key);
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input [63:0] cw; // input cw, has 64bits
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input [63:0] cw; // input cw, has 64bits
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output [447:0] key; // output key, has 7*64bits
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output [447:0] key; // output key, has 7*64bits
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wire [63:0] key1;
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wire [63:0] key1;
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wire [63:0] key2;
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wire [63:0] key2;
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wire [63:0] key3;
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wire [63:0] key3;
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wire [63:0] key4;
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wire [63:0] key4;
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wire [63:0] key5;
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wire [63:0] key5;
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wire [63:0] key6;
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wire [63:0] key6;
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key_perm kp0 ( cw, key6 );
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key_perm kp0 ( cw, key6 );
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key_perm kp1 ( key6, key5 );
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key_perm kp1 ( key6, key5 );
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key_perm kp2 ( key5, key4 );
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key_perm kp2 ( key5, key4 );
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key_perm kp3 ( key4, key3 );
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key_perm kp3 ( key4, key3 );
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key_perm kp4 ( key3, key2 );
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key_perm kp4 ( key3, key2 );
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key_perm kp5 ( key2, key1 );
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key_perm kp5 ( key2, key1 );
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assign key[64*1-1:64*0]=key1 ^ 64'h0000000000000000;
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assign key[64*1-1:64*0]=key1 ^ 64'h0000000000000000;
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assign key[64*2-1:64*1]=key2 ^ 64'h0101010101010101;
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assign key[64*2-1:64*1]=key2 ^ 64'h0101010101010101;
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assign key[64*3-1:64*2]=key3 ^ 64'h0202020202020202;
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assign key[64*3-1:64*2]=key3 ^ 64'h0202020202020202;
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assign key[64*4-1:64*3]=key4 ^ 64'h0303030303030303;
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assign key[64*4-1:64*3]=key4 ^ 64'h0303030303030303;
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assign key[64*5-1:64*4]=key5 ^ 64'h0404040404040404;
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assign key[64*5-1:64*4]=key5 ^ 64'h0404040404040404;
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assign key[64*6-1:64*5]=key6 ^ 64'h0505050505050505;
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assign key[64*6-1:64*5]=key6 ^ 64'h0505050505050505;
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assign key[64*7-1:64*6]=cw ^ 64'h0606060606060606;
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assign key[64*7-1:64*6]=cw ^ 64'h0606060606060606;
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endmodule
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endmodule
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