PHP writes the encryption function that supports private key of described in detail
- 2020-06-12 08:45:19
- OfStack
Part in developing PHP system, members tend to be an essential module, have to face the problem and the process of password is PHP Mcrypt encryption library and the need for additional Settings, many are direct use of md5 encryption () function, and this method is safe, but because md5 is irreversible encryption, unable to restore the password, so there are some inconvenience, in this paper, the encryption function supports the private key, is good to use.
The code is as follows:
PHP:
The result of each encryption is not the same, which greatly strengthens the security of the password.
The code is as follows:
PHP:
<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 the encryption function , Support for private keys </span>
</div>
</li>
<li class="li1"><div class="de1"><span class="co1">// Finish: https://www.ofstack.com </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">$md5</span>
= <span class="kw3">substr</span>
<span class="br0">(</span>
<span class="re0">$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">$i</span>
,<span class="nu0">1</span>
<span class="br0">)</span>
^ <span class="re0">$md5</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'm 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 it 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">" decryption 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>
The result of each encryption is not the same, which greatly strengthens the security of the password.