kolibrios/programs/develop/libraries/crypt_des/trunk/about.htm
IgorA 0a833519d1 1) fix example
2) add documentation

git-svn-id: svn://kolibrios.org@3330 a494cfbc-eb01-0410-851d-a64ba20cac60
2013-03-05 10:14:38 +00:00

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<title>áèáëèîòåêà äëÿ øèôðîâàíèÿ ôàéëîâ ïî àëãîðèòìó DES</title>
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<h1>Îãëàâëåíèå</h1>
<ul>
<li>Âñòóïëåíèå</li>
<li><a href="#fun">Ôóíêöèè</a><br>
<ul>
<li><a href="#f_en">des_encryption</a></li>
<li><a href="#f_de">des_decryption</a></li>
<li><a href="#tabl_e">Òàáëèöà ýêñïîðòà</a></li>
</ul>
<h1>Âñòóïëåíèå</h1>
<p>Áèáëèîòåêà äëÿ øèôðîâàíèÿ ôàéëîâ ïî àëãîðèòìó DES (Data Encryption Standard) — ñèììåòðè÷íûé àëãîðèòì øèôðîâàíèÿ.</p>
<p>Äîêóìåíòàöèÿ îáíîâëÿëàñü 05.03.13.</p>
<h1><a name="fun">Ôóíêöèè</a></h1>
<h4><a name="f_en">des_encryption</a></h4>
<p>Ôóíêöèÿ øèôðîâàíèÿ ôàéëîâ. Ïðèìåð èñïîëüçîâàíèÿ:</p>
<pre>txt_key db 'des_2013',0
mem_key rb 120
...
mov eax,[open_file_size]
shr eax,3
stdcall [des_encryption], txt_key,mem_key,[open_file],eax</pre>
<p>ãäå:</p>
<p><b>txt_key</b> - âõîäíîé êëþ÷ 64 áèò</p>
<p><b>mem_keys</b> - ïàìÿòü äëÿ ôîðìèðîâàíèÿ 16 ïîäêëþ÷åé (ðàçìåð 120 áàéò)</p>
<p><b>[open_file]</b> - óêàçàòåëü íà ïåðâûé øèôðóåìûé 8 áàéòíûé áëîê</p>
<p><b>eax</b> - ÷èñëî áëîêîâ äëÿ øèôðîâàíèÿ (<i>[open_file_size]</i> - ðàçìåð ôàéëà)</p>
<h4><a name="f_de">des_decryption</a></h4>
<p>Ôóíêöèÿ ðàñøèôðîâûâàíèÿ ôàéëîâ. Ïðèìåð èñïîëüçîâàíèÿ:</p>
<pre>txt_key db 'des_2013',0
mem_key rb 120
...
mov eax,[open_file_size]
shr eax,3
stdcall [des_decryption], txt_key,mem_key,[open_file],eax</pre>
<p>ãäå:</p>
<p><b>txt_key</b> - âõîäíîé êëþ÷ 64 áèò</p>
<p><b>mem_keys</b> - ïàìÿòü äëÿ ôîðìèðîâàíèÿ 16 ïîäêëþ÷åé (ðàçìåð 120 áàéò)</p>
<p><b>[open_file]</b> - óêàçàòåëü íà ïåðâûé ðàñøèôðîâûâàåìûé 8 áàéòíûé áëîê</p>
<p><b>eax</b> - ÷èñëî áëîêîâ äëÿ ðàñøèôðîâàíèÿ (<i>[open_file_size]</i> - ðàçìåð ôàéëà)</p>
<h1><a name="tabl_e">Òàáëèöà ýêñïîðòà</a></h1>
<p>Ïðèìåð òàáëèöû ýêñïîðòà, ðàñ÷èòàííîé íà èñïîëüçîâàíèå ìàêðîñà <b>@use_library</b>:</p>
<pre>align 4
import_des:
des_encryption dd sz_des_encryption
des_decryption dd sz_des_decryption
dd 0,0
sz_des_encryption db 'des_encryption',0
sz_des_decryption db 'des_decryption',0</pre>
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