Chaocipher: Difference between revisions
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=={{header|Phix}}==
Originally translated from C, but ended up more of a direct implementation of the algorithm in the pdf.
<!--<lang Phix>(phixonline)--
<span style="color: #000080;font-style:italic;">-- demo\rosetta\Chao_cipher.exw</span>
<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">l_alphabet</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"HXUCZVAMDSLKPEFJRIGTWOBNYQ"</span><span style="color: #0000FF;">,</span>
<span style="color: #000000;">r_alphabet</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"PTLNBQDEOYSFAVZKGJRIHWXUMC"</span>
<span style="color: #008080;">enum</span> <span style="color: #000000;">ENCRYPT</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">DECRYPT</span>
<span style="color: #008080;">function</span> <span style="color: #000000;">chao_cipher</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">integer</span> <span style="color: #000000;">mode</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">bool</span> <span style="color: #000000;">show_steps</span><span style="color: #0000FF;">)</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">len</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">)</span>
<span style="color: #004080;">string</span> <span style="color: #000000;">out</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #008000;">' '</span><span style="color: #0000FF;">,</span><span style="color: #000000;">len</span><span style="color: #0000FF;">),</span>
<span style="color: #000000;">left</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">l_alphabet</span><span style="color: #0000FF;">,</span>
<span style="color: #000000;">right</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">r_alphabet</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">len</span> <span style="color: #008080;">do</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">show_steps</span> <span style="color: #008080;">then</span> <span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"%s %s\n"</span><span style="color: #0000FF;">,</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">left</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">right</span><span style="color: #0000FF;">})</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">index</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">find</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">],</span><span style="color: #008080;">iff</span><span style="color: #0000FF;">(</span><span style="color: #000000;">mode</span><span style="color: #0000FF;">==</span><span style="color: #000000;">ENCRYPT</span><span style="color: #0000FF;">?</span><span style="color: #000000;">right</span><span style="color: #0000FF;">:</span><span style="color: #000000;">left</span><span style="color: #0000FF;">))</span>
<span style="color: #000000;">out</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #008080;">iff</span><span style="color: #0000FF;">(</span><span style="color: #000000;">mode</span><span style="color: #0000FF;">==</span><span style="color: #000000;">ENCRYPT</span><span style="color: #0000FF;">?</span><span style="color: #000000;">left</span><span style="color: #0000FF;">:</span><span style="color: #000000;">right</span><span style="color: #0000FF;">)[</span><span style="color: #000000;">index</span><span style="color: #0000FF;">]</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">==</span><span style="color: #000000;">len</span> <span style="color: #008080;">then</span> <span style="color: #008080;">exit</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #000080;font-style:italic;">/* permute left */</span>
<span style="color: #000000;">left</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">left</span><span style="color: #0000FF;">[</span><span style="color: #000000;">index</span><span style="color: #0000FF;">..</span><span style="color: #000000;">26</span><span style="color: #0000FF;">]&</span><span style="color: #000000;">left</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..</span><span style="color: #000000;">index</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span>
<span style="color: #000000;">left</span><span style="color: #0000FF;">[</span><span style="color: #000000;">2</span><span style="color: #0000FF;">..</span><span style="color: #000000;">14</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">left</span><span style="color: #0000FF;">[</span><span style="color: #000000;">3</span><span style="color: #0000FF;">..</span><span style="color: #000000;">14</span><span style="color: #0000FF;">]&</span><span style="color: #000000;">left</span><span style="color: #0000FF;">[</span><span style="color: #000000;">2</span><span style="color: #0000FF;">]</span>
<span style="color: #000080;font-style:italic;">/* permute right */</span>
<span style="color: #000000;">right</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">right</span><span style="color: #0000FF;">[</span><span style="color: #000000;">index</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..</span><span style="color: #000000;">26</span><span style="color: #0000FF;">]&</span><span style="color: #000000;">right</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..</span><span style="color: #000000;">index</span><span style="color: #0000FF;">]</span>
<span style="color: #000000;">right</span><span style="color: #0000FF;">[</span><span style="color: #000000;">3</span><span style="color: #0000FF;">..</span><span style="color: #000000;">14</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">right</span><span style="color: #0000FF;">[</span><span style="color: #000000;">4</span><span style="color: #0000FF;">..</span><span style="color: #000000;">14</span><span style="color: #0000FF;">]&</span><span style="color: #000000;">right</span><span style="color: #0000FF;">[</span><span style="color: #000000;">3</span><span style="color: #0000FF;">]</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
--printf(1,"\nThe left and right alphabets after each permutation"&▼
<span style="color: #008080;">return</span> <span style="color: #000000;">out</span>
-- " during encryption are :\n\n")▼
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
--string cipher_text = chao_cipher(plain_text, ENCRYPT, true)▼
<span style="color: #004080;">string</span> <span style="color: #000000;">plain_text</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"WELLDONEISBETTERTHANWELLSAID"</span>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"The original plaintext is : %s\n"</span><span style="color: #0000FF;">,</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">plain_text</span><span style="color: #0000FF;">})</span>
▲ <span style="color: #000080;font-style:italic;">--printf(1,"\nThe left and right alphabets after each permutation"&
▲ --string cipher_text = chao_cipher(plain_text, ENCRYPT, true)</span>
<span style="color: #004080;">string</span> <span style="color: #000000;">cipher_text</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">chao_cipher</span><span style="color: #0000FF;">(</span><span style="color: #000000;">plain_text</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">ENCRYPT</span><span style="color: #0000FF;">,</span> <span style="color: #004600;">false</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"\nThe ciphertext is : %s\n"</span><span style="color: #0000FF;">,</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">cipher_text</span><span style="color: #0000FF;">})</span>
<span style="color: #004080;">string</span> <span style="color: #000000;">plain_text2</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">chao_cipher</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cipher_text</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">DECRYPT</span><span style="color: #0000FF;">,</span> <span style="color: #004600;">false</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"\nThe recovered plaintext is : %s\n"</span><span style="color: #0000FF;">,</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">plain_text2</span><span style="color: #0000FF;">})</span>
<!--</lang>-->
{{out}}
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