sha256.v

安全散列函数的VERILOG实现

                begin
                        case (round)
                        
                        'd0:
                                begin
                                        if (cmd[1])
                                        begin
                                                W0 <= text_i;
                                                Wt <= text_i;
                                                busy <= 'b1;
                                                round <= round_plus_1;
                                                
                                                case (cmd[2])
                                                        1'b0:   // sha-256 first message
                                                                begin
                                                                        A <= `SHA256_H0;
                                                                        B <= `SHA256_H1;
                                                                        C <= `SHA256_H2;
                                                                        D <= `SHA256_H3;
                                                                        E <= `SHA256_H4;
                                                                        F <= `SHA256_H5;
                                                                        G <= `SHA256_H6;
                                                                        H <= `SHA256_H7;

                                                                        H0 <= `SHA256_H0;
                                                                        H1 <= `SHA256_H1;
                                                                        H2 <= `SHA256_H2;
                                                                        H3 <= `SHA256_H3;
                                                                        H4 <= `SHA256_H4;
                                                                        H5 <= `SHA256_H5;
                                                                        H6 <= `SHA256_H6;
                                                                        H7 <= `SHA256_H7;
                                                                end
                                                        1'b1:   // sha-256 internal message
                                                                begin
                                                                        H0 <= A;
                                                                        H1 <= B;
                                                                        H2 <= C;
                                                                        H3 <= D;
                                                                        H4 <= E;
                                                                        H5 <= F;
                                                                        H6 <= G;
                                                                        H7 <= H;
                                                                end
                                                endcase
                                        end
                                        else
                                        begin   // IDLE
                                                round <= 'd0;
                                        end
                                end
                        'd1:
                                begin
                                        W1 <= text_i;
                                        Wt <= text_i;
                                        
                                        H <= G;
                                        G <= F;
                                        F <= E;
                                        E <= next_E;
                                        D <= C;
                                        C <= B;
                                        B <= A;
                                        A <= next_A;
                                                
                                        round <= round_plus_1;
                                end
                        'd2:
                                begin
                                        W2 <= text_i;
                                        Wt <= text_i;
                                        
                                        H <= G;
                                        G <= F;
                                        F <= E;
                                        E <= next_E;
                                        D <= C;
                                        C <= B;
                                        B <= A;
                                        A <= next_A;
                                                
                                        round <= round_plus_1;
                                end
                        'd3:
                                begin
                                        W3 <= text_i;
                                        Wt <= text_i;
                                        
                                        H <= G;
                                        G <= F;
                                        F <= E;
                                        E <= next_E;
                                        D <= C;
                                        C <= B;
                                        B <= A;
                                        A <= next_A;
                                                
                                        round <= round_plus_1;
                                end
                        'd4:
                                begin
                                        W4 <= text_i;
                                        Wt <= text_i;
                                        
                                        H <= G;
                                        G <= F;
                                        F <= E;
                                        E <= next_E;
                                        D <= C;
                                        C <= B;
                                        B <= A;
                                        A <= next_A;
                                                
                                        round <= round_plus_1;
                                end
                        'd5:
                                begin
                                        W5 <= text_i;
                                        Wt <= text_i;
                                        
                                        H <= G;
                                        G <= F;
                                        F <= E;
                                        E <= next_E;
                                        D <= C;
                                        C <= B;
                                        B <= A;
                                        A <= next_A;
                                                
                                        round <= round_plus_1;
                                end
                        'd6:
                                begin
                                        W6 <= text_i;
                                        Wt <= text_i;
                                        
                                        H <= G;
                                        G <= F;
                                        F <= E;
                                        E <= next_E;
                                        D <= C;
                                        C <= B;
                                        B <= A;
                                        A <= next_A;
                                                
                                        round <= round_plus_1;
                                end
                        'd7:
                                begin
                                        W7 <= text_i;
                                        Wt <= text_i;
                                        
                                        H <= G;
                                        G <= F;
                                        F <= E;
                                        E <= next_E;
                                        D <= C;
                                        C <= B;
                                        B <= A;
                                        A <= next_A;
                                                
                                        round <= round_plus_1;
                                end
                        'd8:
                                begin
                                        W8 <= text_i;
                                        Wt <= text_i;
                                        
                                        H <= G;
                                        G <= F;
                                        F <= E;
                                        E <= next_E;
                                        D <= C;
                                        C <= B;
                                        B <= A;
                                        A <= next_A;
                                                
                                        round <= round_plus_1;
                                end
                        'd9:
                                begin
                                        W9 <= text_i;
                                        Wt <= text_i;
                                        
                                        H <= G;
                                        G <= F;
                                        F <= E;
                                        E <= next_E;
                                        D <= C;
                                        C <= B;
                                        B <= A;
                                        A <= next_A;
                                                
                                        round <= round_plus_1;
                                end
                        'd10:
                                begin
                                        W10 <= text_i;
                                        Wt <= text_i;
                                        
                                        H <= G;
                                        G <= F;
                                        F <= E;
                                        E <= next_E;
                                        D <= C;
                                        C <= B;
                                        B <= A;
                                        A <= next_A;
                                                
                                        round <= round_plus_1;
                                end
                        'd11:
                                begin
                                        W11 <= text_i;
                                        Wt <= text_i;
                                        
                                        H <= G;
                                        G <= F;
                                        F <= E;
                                        E <= next_E;
                                        D <= C;
                                        C <= B;
                                        B <= A;
                                        A <= next_A;
                                                
                                        round <= round_plus_1;
                                end
                        'd12:
                                begin
                                        W12 <= text_i;
                                        Wt <= text_i;
                                        
                                        H <= G;
                                        G <= F;
                                        F <= E;
                                        E <= next_E;
                                        D <= C;
                                        C <= B;
                                        B <= A;
                                        A <= next_A;
                                                
                                        round <= round_plus_1;
                                end
                        'd13:
                                begin
                                        W13 <= text_i;
                                        Wt <= text_i;
                                        
                                        H <= G;
                                        G <= F;
                                        F <= E;
                                        E <= next_E;
                                        D <= C;
                                        C <= B;
                                        B <= A;
                                        A <= next_A;
                                                
                                        round <= round_plus_1;
                                end