Create unit test to confirm non-biased random numbers (uniform distribution)

[sa6mwa]

I don't know enough about RNG tests, but think it would be cool to have the RNG in Krypto431 pass all of the dieharder(1) tests. This is an example how to test the Linux /dev/urandom PRNG (well, /dev/random is also a PRNG, it just blocks when the entropy is out). We can do a similar test with the PRNGs in Krypto431, but the numbers need to be 0 to 25 (you probably need to set the range in dieharder somehow). For example, look at the two WEAK assessments below...

From the dieharder man page...

   Alternatively, dieharder can be used to test files of numbers  produced
   by a candidate random number generators:

     dieharder -a -g 201 -f random.org_bin

   for raw binary input or

     dieharder -a -g 202 -f random.org.txt

$ cat /dev/urandom | dieharder -a -g 200
#=============================================================================#
#            dieharder version 3.31.1 Copyright 2003 Robert G. Brown          #
#=============================================================================#
   rng_name    |rands/second|   Seed   |
stdin_input_raw|  1.13e+07  |1428260778|
#=============================================================================#
        test_name   |ntup| tsamples |psamples|  p-value |Assessment
#=============================================================================#
   diehard_birthdays|   0|       100|     100|0.28151290|  PASSED  
      diehard_operm5|   0|   1000000|     100|0.62816230|  PASSED  
  diehard_rank_32x32|   0|     40000|     100|0.22641794|  PASSED  
    diehard_rank_6x8|   0|    100000|     100|0.07648248|  PASSED  
   diehard_bitstream|   0|   2097152|     100|0.90620443|  PASSED  
        diehard_opso|   0|   2097152|     100|0.19382105|  PASSED  
        diehard_oqso|   0|   2097152|     100|0.16862596|  PASSED  
         diehard_dna|   0|   2097152|     100|0.80774230|  PASSED  
diehard_count_1s_str|   0|    256000|     100|0.81936551|  PASSED  
diehard_count_1s_byt|   0|    256000|     100|0.17920809|  PASSED  
 diehard_parking_lot|   0|     12000|     100|0.96831462|  PASSED  
    diehard_2dsphere|   2|      8000|     100|0.96217378|  PASSED  
    diehard_3dsphere|   3|      4000|     100|0.55956984|  PASSED  
     diehard_squeeze|   0|    100000|     100|0.44334894|  PASSED  
        diehard_sums|   0|       100|     100|0.70990252|  PASSED  
        diehard_runs|   0|    100000|     100|0.75815013|  PASSED  
        diehard_runs|   0|    100000|     100|0.04289927|  PASSED  
       diehard_craps|   0|    200000|     100|0.94163220|  PASSED  
       diehard_craps|   0|    200000|     100|0.97273682|  PASSED  
 marsaglia_tsang_gcd|   0|  10000000|     100|0.91438421|  PASSED  
 marsaglia_tsang_gcd|   0|  10000000|     100|0.97598335|  PASSED  
         sts_monobit|   1|    100000|     100|0.60896355|  PASSED  
            sts_runs|   2|    100000|     100|0.74353520|  PASSED  
          sts_serial|   1|    100000|     100|0.19787900|  PASSED  
          sts_serial|   2|    100000|     100|0.70397015|  PASSED  
          sts_serial|   3|    100000|     100|0.08278372|  PASSED  
          sts_serial|   3|    100000|     100|0.93438930|  PASSED  
          sts_serial|   4|    100000|     100|0.07266823|  PASSED  
          sts_serial|   4|    100000|     100|0.20766267|  PASSED  
          sts_serial|   5|    100000|     100|0.23227633|  PASSED  
          sts_serial|   5|    100000|     100|0.99087787|  PASSED  
          sts_serial|   6|    100000|     100|0.02708506|  PASSED  
          sts_serial|   6|    100000|     100|0.23152481|  PASSED  
          sts_serial|   7|    100000|     100|0.00124029|   WEAK   
          sts_serial|   7|    100000|     100|0.00175634|   WEAK   
          sts_serial|   8|    100000|     100|0.15996183|  PASSED  
          sts_serial|   8|    100000|     100|0.63733538|  PASSED  
          sts_serial|   9|    100000|     100|0.58882223|  PASSED  
          sts_serial|   9|    100000|     100|0.09394493|  PASSED  
          sts_serial|  10|    100000|     100|0.35573017|  PASSED  
          sts_serial|  10|    100000|     100|0.59022963|  PASSED  
          sts_serial|  11|    100000|     100|0.52742847|  PASSED  
          sts_serial|  11|    100000|     100|0.89610194|  PASSED  
          sts_serial|  12|    100000|     100|0.14909867|  PASSED  
          sts_serial|  12|    100000|     100|0.92046940|  PASSED  
          sts_serial|  13|    100000|     100|0.88926749|  PASSED  
          sts_serial|  13|    100000|     100|0.30840791|  PASSED  
          sts_serial|  14|    100000|     100|0.46455530|  PASSED  
          sts_serial|  14|    100000|     100|0.70294453|  PASSED  
          sts_serial|  15|    100000|     100|0.20870357|  PASSED  
          sts_serial|  15|    100000|     100|0.01099756|  PASSED  
          sts_serial|  16|    100000|     100|0.22245261|  PASSED  
          sts_serial|  16|    100000|     100|0.55027247|  PASSED  
         rgb_bitdist|   1|    100000|     100|0.93378073|  PASSED  
         rgb_bitdist|   2|    100000|     100|0.81954461|  PASSED  
         rgb_bitdist|   3|    100000|     100|0.64799316|  PASSED  
         rgb_bitdist|   4|    100000|     100|0.35560131|  PASSED  
         rgb_bitdist|   5|    100000|     100|0.37430215|  PASSED  
         rgb_bitdist|   6|    100000|     100|0.42392682|  PASSED  
         rgb_bitdist|   7|    100000|     100|0.89174165|  PASSED  
         rgb_bitdist|   8|    100000|     100|0.65737678|  PASSED  
         rgb_bitdist|   9|    100000|     100|0.98717990|  PASSED  
         rgb_bitdist|  10|    100000|     100|0.33063485|  PASSED  
         rgb_bitdist|  11|    100000|     100|0.64609554|  PASSED  

...