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| <html> |
| <head> |
| <title>áèáëèîòåêà äëÿ øèôðîâàíèÿ ôàéëîâ ïî àëãîðèòìó DES</title> |
| <meta http-equiv="content-type" content="text/html; charset=WINDOWS-1251"> |
| <style> |
| body |
| { |
| font-size: 15px; |
| font-family: "Bookman Old Style"; |
| color: black; |
| text-align: justify; |
| } |
| h1 { color: green; font-size: 23px; } |
| h2 { color: green; font-size: 21px; } |
| h3 { color: green; font-size: 19px; } |
| h4 { color: #803f00; font-size: 17px; } |
| i { color: #0099cc; } |
| b { color: #0099cc; } |
| p { |
| text-indent: 1em; |
| margin-top: 3px; |
| margin-bottom: 2px; |
| margin-left: 0px; |
| margin-right: 0px; |
| } |
| ol, ul, dl{ |
| margin-top: 3px; |
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| pre |
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| padding: 2px; |
| padding-left: 20px; |
| margin-top: 5px; |
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| margin-left: 0px; |
| margin-right: 0px; |
| font-family: "Courier New"; |
| font-size: 15px; |
| color: #004000; |
| background-color: #ffd0ff; |
| } |
| table { font-size: 15px; } |
| </style> |
| </head> |
| |
| <body> |
| |
| <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> |
| |
| </body> |
| </html> |