Adding siganture checker

- Dead simple, just recreate the same lfsr pattern at destination

stdlib/rtl/oh_verify.v

@@ -0,0 +1,43 @@
+//#############################################################################
+//# Function: Signature Checker                                               #
+//#############################################################################
+//# Author:   Andreas Olofsson                                                #
+//# License:  MIT (see LICENSE file in OH! repository)                        #
+//#############################################################################
+
+module oh_verify
+  #(parameter N = 32  // width of verifier
+    )
+   (
+    input 	   clk,
+    input 	   nreset, //async reset
+    input 	   en, // enable counter
+    input 	   entaps, // enable taps input
+    input [N-1:0]  taps, // user driven taps
+    input [N-1:0]  seed, // seed
+    input [N-1:0]  mask, // mask output (1 = active)
+    input [N-1:0]  in, // input data
+    output [N-1:0] out, // generated random number
+    output 	   error // difference found
+    );
+
+   // Recreate random number
+   oh_random oh_random(/*AUTOINST*/
+		       // Outputs
+		       .out		(out[N-1:0]),
+		       // Inputs
+		       .clk		(clk),
+		       .nreset		(nreset),
+		       .en		(en),
+		       .entaps		(entaps),
+		       .taps		(taps[N-1:0]),
+		       .seed		(seed[N-1:0]),
+		       .mask		(mask[N-1:0]));
+
+
+   // Compare random number to data
+   // TODO: add
+   assign error = (out[N-1:0] != in[N-1:0]);
+
+
+endmodule // oh_random