给出代码示例

以下是一个简单的Verilog实现MD5算法的示例代码，仅供参考：

module MD5(
  input clk,
  input rst,
  input [7:0] msg_in,
  output reg [127:0] md_out
);

reg [511:0] msg_buf;
reg [31:0] a, b, c, d;
reg [31:0] f, g, temp;
reg [31:0] k [0:63] = '{ 32'hd76aa478, 32'he8c7b756, 32'h242070db, 32'hc1bdceee,
                            32'hf57c0faf, 32'h4787c62a, 32'ha8304613, 32'hfd469501,
                            32'h698098d8, 32'h8b44f7af, 32'hffff5bb1, 32'h895cd7be,
                            32'h6b901122, 32'hfd987193, 32'ha679438e, 32'h49b40821,
                            32'hf61e2562, 32'hc040b340, 32'h265e5a51, 32'he9b6c7aa,
                            32'hd62f105d, 32'h02441453, 32'hd8a1e681, 32'he7d3fbc8,
                            32'h21e1cde6, 32'hc33707d6, 32'hf4d50d87, 32'h455a14ed,
                            32'ha9e3e905, 32'hfcefa3f8, 32'h676f02d9, 32'h8d2a4c8a,
                            32'hfffa3942, 32'h8771f681, 32'h6d9d6122, 32'hfde5380c,
                            32'ha4beea44, 32'h4bdecfa9, 32'hf6bb4b60, 32'hbebfbc70,
                            32'h289b7ec6, 32'heaa127fa, 32'hd4ef3085, 32'h04881d05,
                            32'hd9d4d039, 32'he6db99e5, 32'h1fa27cf8, 32'hc4ac5665,
                            32'hf4292244, 32'h432aff97, 32'hab9423a7, 32'hfc93a039,
                            32'h655b59c3, 32'h8f0ccc92, 32'hffeff47d, 32'h85845dd1,
                            32'h6fa87e4f, 32'hfe2ce6e0, 32'ha3014314, 32'h4e0811a1,
                            32'hf7537e82, 32'hbd3af235, 32'h2ad7d2bb, 32'heb86d391 };
reg [31:0] s [0:63] = '{ 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
                           5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20,
                           4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
                           6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21 };

integer i, j;

always @(posedge clk) begin
  if (rst) begin
    msg_buf <= 512'h0;
    a <= 32'h67452301;
    b <= 32'hefcdab89;
    c <= 32'h98badcfe;
    d <= 32'h10325476;
  end else begin
    msg_buf[7:0] <= msg_in;
    if ((i+1)%64 == 0) begin
      for (j = 0; j < 16; j = j + 1) begin
        f = (b & c) | ((~b) & d);
        g = j;
        temp = d;
        d = c;
        c = b;
        b = b + ((a + f + k[j] + msg_buf[j*4 + 3:j*4]) << s[j]);
        a = temp;
      end
    end
    i = i + 1;
  end
end

assign md_out = {a, b, c, d};

endmodule

这只是一个简单的示例，具体实现还需要根据具体需求进行调整和完善。