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PHP Write encryption function, support private key (detailed introduction) _php Tips

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Author: User
Tags decrypt md5 php write
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In the development of PHP system, the member is often an essential module, and password processing has to face the problem, PHP Mcrypt Encryption Library needs additional settings, many people are directly using MD5 () function encryption, this method is indeed safe, but because MD5 is irreversible encryption, Unable to restore the password, so there are some inconveniences, this article describes the encryption function to support the private key, it is good to use.
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<ol><li class= "Li1" ><div class= "De1" > </div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "Kw2" ><?php</span>
</div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "co1" >//Description: PHP write encryption function, support private key </span>
</div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "Co1" >//collation: Http://www.jb51.net </span>
</div>
</li>
<li class= "Li2" ><div class= "De2" > </div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "Kw2" >function</span>
Keyed<span class= "Br0" > (</span>
<span class= "Re0" > $txt </span>
, <span class= "Re0" > $encrypt _key</span>
<span class= "Br0" >) </span>
</div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "Br0" >{</span>
</div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "re0" > $encrypt _key</span>
= <span class= "KW3" >md5</span>
<span class= "Br0" > (</span>
<span class= "Re0" > $encrypt _key</span>
<span class= "Br0" >) </span>
; </div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "re0" > $ctr </span>
=<span class= "Nu0" >0</span>
; </div>
</li>
<li class= "Li2" ><div class= "De2" > <span class= "re0" > $tmp </span>
= <span class= "st0" > "" </span>
; </div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "kw1" >for</span>
<span class= "Br0" > (</span>
<span class= "Re0" > $i </span>
=<span class= "Nu0" >0</span>
; <span class= "Re0" > $i </span>
<strlen<span class= "Br0" > (</span>
<span class= "Re0" > $txt </span>
<span class= "Br0" >) </span>
; <span class= "Re0" > $i </span>
++<span class= "Br0" >) </span>
</div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "br0" >{</span>
</div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "kw1" >if</span>
<span class= "Br0" > (</span>
<span class= "Re0" > $ctr </span>
==<span class= "KW3" >strlen</span>
<span class= "Br0" > (</span>
<span class= "Re0" > $encrypt _key</span>
<span class= "Br0" >) </span>
<span class= "Br0" >) </span>
<span class= "Re0" > $ctr </span>
=<span class= "Nu0" >0</span>
; </div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "re0" > $tmp </span>
. = <span class= "KW3" >substr</span>
<span class= "Br0" > (</span>
<span class= "Re0" > $txt </span>
, <span class= "Re0" > $i </span>
, <span class= "Nu0" >1</span>
<span class= "Br0" >) </span>
^ <span class= "KW3" >substr</span>
<span class= "Br0" > (</span>
<span class= "Re0" > $encrypt _key</span>
, <span class= "Re0" > $ctr </span>
, <span class= "Nu0" >1</span>
<span class= "Br0" >) </span>
; </div>
</li>
<li class= "Li2" ><div class= "De2" > <span class= "re0" > $ctr </span>
++; </div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "br0" >}</span>
</div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "kw1" >return</span>
<span class= "Re0" > $tmp </span>
; </div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "Br0" >}</span>
</div>
</li>
<li class= "Li1" ><div class= "De1" > </div>
</li>
<li class= "Li2" ><div class= "De2" ><span class= "Kw2" >function</span>
Encrypt<span class= "Br0" > (</span>
<span class= "Re0" > $txt </span>
, <span class= "Re0" > $key </span>
<span class= "Br0" >) </span>
</div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "Br0" >{</span>
</div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "kw3" >srand</span>
<span class= "Br0" > (</span>
<span class= "Br0" > (</span>
Double<span class= "Br0" >) </span>
<span class= "KW3" >microtime</span>
<span class= "Br0" > (</span>
<span class= "Br0" >) </span>
*<span class= "Nu0" >1000000</span>
<span class= "Br0" >) </span>
; </div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "re0" > $encrypt _key</span>
= <span class= "KW3" >md5</span>
<span class= "Br0" > (</span>
<span class= "KW3" >rand</span>
<span class= "Br0" > (</span>
<span class= "Nu0" >0</span>
, <span class= "Nu0" >32000</span>
<span class= "Br0" >) </span>
<span class= "Br0" >) </span>
; </div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "re0" > $ctr </span>
=<span class= "Nu0" >0</span>
; </div>
</li>
<li class= "Li2" ><div class= "De2" > <span class= "re0" > $tmp </span>
= <span class= "st0" > "" </span>
; </div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "kw1" >for</span>
<span class= "Br0" > (</span>
<span class= "Re0" > $i </span>
=<span class= "Nu0" >0</span>
; <span class= "Re0" > $i </span>
<strlen<span class= "Br0" > (</span>
<span class= "Re0" > $txt </span>
<span class= "Br0" >) </span>
; <span class= "Re0" > $i </span>
++<span class= "Br0" >) </span>
</div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "br0" >{</span>
</div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "kw1" >if</span>
<span class= "Br0" > (</span>
<span class= "Re0" > $ctr </span>
==<span class= "KW3" >strlen</span>
<span class= "Br0" > (</span>
<span class= "Re0" > $encrypt _key</span>
<span class= "Br0" >) </span>
<span class= "Br0" >) </span>
<span class= "Re0" > $ctr </span>
=<span class= "Nu0" >0</span>
; </div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "re0" > $tmp </span>
. = <span class= "KW3" >substr</span>
<span class= "Br0" > (</span>
<span class= "Re0" > $encrypt _key</span>
, <span class= "Re0" > $ctr </span>
, <span class= "Nu0" >1</span>
<span class= "Br0" >) </span>
. <span class= "Br0" > (</span>
<span class= "KW3" >substr</span>
<span class= "Br0" > (</span>
<span class= "Re0" > $txt </span>
, <span class= "Re0" > $i </span>
, <span class= "Nu0" >1</span>
<span class= "Br0" >) </span>
^ <span class= "KW3" >substr</span>
<span class= "Br0" > (</span>
<span class= "Re0" > $encrypt _key</span>
, <span class= "Re0" > $ctr </span>
, <span class= "Nu0" >1</span>
<span class= "Br0" >) </span>
<span class= "Br0" >) </span>
; </div>
</li>
<li class= "Li2" ><div class= "De2" > <span class= "re0" > $ctr </span>
++; </div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "br0" >}</span>
</div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "kw1" >return</span>
Keyed<span class= "Br0" > (</span>
<span class= "Re0" > $tmp </span>
, <span class= "Re0" > $key </span>
<span class= "Br0" >) </span>
; </div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "Br0" >}</span>
</div>
</li>
<li class= "Li1" ><div class= "De1" > </div>
</li>
<li class= "Li2" ><div class= "De2" ><span class= "Kw2" >function</span>
Decrypt<span class= "Br0" > (</span>
<span class= "Re0" > $txt </span>
, <span class= "Re0" > $key </span>
<span class= "Br0" >) </span>
</div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "Br0" >{</span>
</div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "re0" > $txt </span>
= Keyed<span class= "Br0" > (</span>
<span class= "Re0" > $txt </span>
, <span class= "Re0" > $key </span>
<span class= "Br0" >) </span>
; </div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "re0" > $tmp </span>
= <span class= "st0" > "" </span>
; </div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "kw1" >for</span>
<span class= "Br0" > (</span>
<span class= "Re0" > $i </span>
=<span class= "Nu0" >0</span>
; <span class= "Re0" > $i </span>
<strlen<span class= "Br0" > (</span>
<span class= "Re0" > $txt </span>
<span class= "Br0" >) </span>
; <span class= "Re0" > $i </span>
++<span class= "Br0" >) </span>
</div>
</li>
<li class= "Li2" ><div class= "De2" > <span class= "br0" >{</span>
</div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "re0" > $md 5</span>
= <span class= "KW3" >substr</span>
<span class= "Br0" > (</span>
<span class= "Re0" > $txt </span>
, <span class= "Re0" > $i </span>
, <span class= "Nu0" >1</span>
<span class= "Br0" >) </span>
; </div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "re0" > $i </span>
++; </div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "re0" > $tmp </span>
. = <span class= "Br0" > (</span>
<span class= "KW3" >substr</span>
<span class= "Br0" > (</span>
<span class= "Re0" > $txt </span>
, <span class= "Re0" > $i </span>
, <span class= "Nu0" >1</span>
<span class= "Br0" >) </span>
^ <span class= "Re0" > $md 5</span>
<span class= "Br0" >) </span>
; </div>
</li>
<li class= "Li1" ><div class= "De1" > <span class= "br0" >}</span>
</div>
</li>
<li class= "Li2" ><div class= "De2" > <span class= "kw1" >return</span>
<span class= "Re0" > $tmp </span>
; </div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "Br0" >}</span>
</div>
</li>
<li class= "Li1" ><div class= "De1" > </div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "re0" > $key </span>
= <span class= "st0" > "www.yitu.org" </span>
; </div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "re0" > $string </span>
= <span class= "st0" > "I am an encrypted character" </span>
; </div>
</li>
<li class= "Li2" ><div class= "De2" > </div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "co1" >//encrypt $string, and store it in $enc _text </ Span>
</div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "re0" > $enc _text</span>
= Encrypt<span class= "Br0" > (</span>
<span class= "Re0" > $string </span>
, <span class= "Re0" > $key </span>
<span class= "Br0" >) </span>
; </div>
</li>
<li class= "Li1" ><div class= "De1" > </div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "Co1" >//decrypt the encrypted text $enc _text, and store I T in $dec _text </span>
</div>
</li>
<li class= "Li2" ><div class= "De2" ><span class= "re0" > $dec _text</span>
= Decrypt<span class= "Br0" > (</span>
<span class= "Re0" > $enc _text</span>
, <span class= "Re0" > $key </span>
<span class= "Br0" >) </span>
; </div>
</li>
<li class= "Li1" ><div class= "De1" > </div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "KW3" >print</span>
<span class= "St0" > "Encrypted text: $enc _text <Br>" </span>
; </div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "KW3" >print</span>
<span class= "St0" > "decrypted text: $dec _text <Br>" </span>
; </div>
</li>
<li class= "Li1" ><div class= "de1" ><span class= "Kw2" >?></span>
</div>
</li>
<li class= "Li2" ><div class= "De2" > </div>
</li>
</ol>

Each time the result of the encryption is not the same, greatly enhance the security of the password.

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Related Keywords:
public key encryption private key decryption php public key encryption php write function php private static function php private function key function in php encryption key

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