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60e3ce1c96
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For each character, XOR with the corresponding key char (key cycled
via 'i mod kn'):
let xor_cipher key text =
let buf = Buffer.create n in
for i = 0 to n - 1 do
let c = Char.code text.[i] in
let k = Char.code key.[i mod kn] in
Buffer.add_string buf (String.make 1 (Char.chr (c lxor k)))
done;
Buffer.contents buf
XOR is its own inverse, so encrypt + decrypt with the same key yields
the original. Test combines:
- String.length decoded = 6
- decoded = 'Hello!' -> 1
- 6 * 100 + 1 = 601
Tests Char.code + Char.chr round-trip, the iter-127 lxor operator,
Buffer.add_string + String.make 1, and key-cycling via mod.
90 baseline programs total.
95 lines
2.0 KiB
JSON
95 lines
2.0 KiB
JSON
{
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"ackermann.ml": 125,
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"anagram_check.ml": 2,
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"anagrams.ml": 3,
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"atm.ml": 120,
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"bag.ml": 3,
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"bf_full.ml": 6,
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"bisect.ml": 141,
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"bigint_add.ml": 28,
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"bits.ml": 21,
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"balance.ml": 3,
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"base_n.ml": 17,
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"bfs.ml": 6,
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"btree.ml": 39,
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"brainfuck.ml": 75,
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"bsearch.ml": 7,
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"caesar.ml": 215,
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"calc.ml": 13,
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"closures.ml": 315,
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"coin_change.ml": 6,
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"count_change.ml": 406,
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"csv.ml": 10,
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"exception_handle.ml": 4,
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"exception_user.ml": 26,
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"expr_eval.ml": 16,
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"expr_simp.ml": 22,
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"factorial.ml": 3628800,
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"fib_doubling.ml": 102334155,
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"fib_mod.ml": 391360,
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"fraction.ml": 7,
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"frequency.ml": 5,
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"gcd_lcm.ml": 60,
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"grep_count.ml": 3,
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"grid_paths.ml": 210,
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"group_consec.ml": 53,
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"hailstone.ml": 111,
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"hanoi.ml": 1023,
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"hist.ml": 75,
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"int_sqrt.ml": 1027,
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"fizzbuzz.ml": 57,
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"flatten_tree.ml": 28,
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"list_ops.ml": 30,
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"luhn.ml": 2,
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"mat_mul.ml": 621,
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"max_path_tree.ml": 11,
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"mod_inverse.ml": 27,
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"json_pretty.ml": 24,
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"kadane.ml": 6,
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"lambda_calc.ml": 7,
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"levenshtein.ml": 11,
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"memo_fib.ml": 75025,
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"mortgage.ml": 1073,
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"merge_sort.ml": 44,
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"merge_two.ml": 441,
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"module_use.ml": 3,
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"newton_sqrt.ml": 1414,
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"mutable_record.ml": 10,
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"option_match.ml": 5,
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"palindrome.ml": 4,
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"paren_depth.ml": 7,
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"pancake_sort.ml": 910,
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"pascal.ml": 252,
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"peano.ml": 30,
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"pi_leibniz.ml": 314,
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"prefix_sum.ml": 66,
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"pretty_table.ml": 64,
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"poly_stack.ml": 5,
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"pow_mod.ml": 738639,
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"prime_factors.ml": 17,
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"queens.ml": 2,
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"quicksort.ml": 44,
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"roman.ml": 44,
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"rpn.ml": 9,
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"run_decode.ml": 21,
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"run_length.ml": 11,
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"safe_div.ml": 20,
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"shuffle.ml": 55,
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"simpson_int.ml": 10000,
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"stable_unique.ml": 46,
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"subset_sum.ml": 8,
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"tic_tac_toe.ml": 1,
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"word_freq.ml": 8,
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"xor_cipher.ml": 601,
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"zigzag.ml": 55,
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"zip_unzip.ml": 1000,
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"sieve.ml": 15,
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"sum_squares.ml": 385,
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"tree_depth.ml": 4,
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"triangle.ml": 11,
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"twosum.ml": 5,
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"unique_set.ml": 9,
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"validate.ml": 417,
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"word_count.ml": 3
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}
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