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Line 12... |
//// - Luo Dongjun, dongjun_luo@hotmail.com ////
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//// - Luo Dongjun, dongjun_luo@hotmail.com ////
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//// ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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module sbox(
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module sbox(
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clk,
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clk,
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reset_n,
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reset,
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enable,
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enable,
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din,
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din,
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ende,
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ende,
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en_dout,
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en_dout,
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de_dout);
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de_dout);
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input clk;
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input clk;
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input reset_n;
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input reset;
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input enable;
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input enable;
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input [7:0] din;
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input [7:0] din;
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input ende; //0: encryption; 1: decryption
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input ende; //0: encryption; 1: decryption
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output [7:0] en_dout;
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output [7:0] en_dout;
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output [7:0] de_dout;
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output [7:0] de_dout;
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| Line 37... |
Line 37... |
// GF(256) to GF(16) transformation
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// GF(256) to GF(16) transformation
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assign first_matrix_in[7:0] = ende ? INV_AFFINE(din[7:0]): din[7:0];
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assign first_matrix_in[7:0] = ende ? INV_AFFINE(din[7:0]): din[7:0];
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assign first_matrix_out[7:0] = GF256_TO_GF16(first_matrix_in[7:0]);
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assign first_matrix_out[7:0] = GF256_TO_GF16(first_matrix_in[7:0]);
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// pipeline 1
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// pipeline 1
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always @ (posedge clk or negedge reset_n)
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always @ (posedge clk or posedge reset)
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begin
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begin
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if (!reset_n)
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if (reset)
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first_matrix_out_L[7:0] <= 8'b0;
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first_matrix_out_L[7:0] <= 8'b0;
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else if (enable)
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else if (enable)
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first_matrix_out_L[7:0] <= first_matrix_out[7:0];
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first_matrix_out_L[7:0] <= first_matrix_out[7:0];
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end
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end
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| Line 79... |
Line 79... |
// results
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// results
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assign p_new[3:0] = MUL(sumpq[3:0],inv_sump2q2[3:0]);
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assign p_new[3:0] = MUL(sumpq[3:0],inv_sump2q2[3:0]);
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assign q_new[3:0] = MUL(q[3:0],inv_sump2q2[3:0]);
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assign q_new[3:0] = MUL(q[3:0],inv_sump2q2[3:0]);
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// pipeline 2
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// pipeline 2
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always @ (posedge clk or negedge reset_n)
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always @ (posedge clk or posedge reset)
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begin
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begin
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if (!reset_n)
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if (reset)
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{p_new_L[3:0],q_new_L[3:0]} <= 8'b0;
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{p_new_L[3:0],q_new_L[3:0]} <= 8'b0;
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else if (enable)
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else if (enable)
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{p_new_L[3:0],q_new_L[3:0]} <= {p_new[3:0],q_new[3:0]};
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{p_new_L[3:0],q_new_L[3:0]} <= {p_new[3:0],q_new[3:0]};
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end
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end
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