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