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13 lines
402 B
Systemverilog
13 lines
402 B
Systemverilog
// find a hash collision for DJB2 hash where it visits the same state twice
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module djb2hash (input clock);
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(* keep *) rand const reg [31:0] magic;
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(* keep *) rand reg [7:0] inputval;
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(* keep *) reg [31:0] state = 5381;
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(* keep *) integer cnt = 0;
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always @(posedge clock) begin
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state <= ((state << 5) + state) ^ inputval;
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if (state == magic) cnt <= cnt + 1;
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assert (cnt < 2);
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end
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endmodule
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