Php custom encryption solution implementation code. The Mcrypt encryption library in PHP requires additional settings. many people directly use the md5 () function for encryption. this method is indeed safe, but because md5 is irreversible encryption, the password cannot be restored, therefore, there is also a PHP Mcrypt encryption library that requires additional settings. many people directly use the md5 () function for encryption. this method is indeed safe, but because md5 is irreversible encryption, the password cannot be restored, therefore, there are some inconveniences. This article introduces how encryption functions support private keys, which are good for use.
| The code is as follows: |
|
// Description: encryption function written in PHP. private keys are supported.
Function keyED ($ txt, $ encrypt_key)
{
$ Encrypt_key = md5 ($ encrypt_key );
$ Ctr = 0;
$ Tmp = "";
For ($ I = 0; $ I {
If ($ ctr = strlen ($ encrypt_key) $ ctr = 0;
$ Tmp. = substr ($ txt, $ I, 1) ^ substr ($ encrypt_key, $ ctr, 1 );
$ Ctr ++;
}
Return $ tmp;
}
Function encrypt ($ txt, $ key)
{
Srand (double) microtime () * 1000000 );
$ Encrypt_key = md5 (rand (0, 32000 ));
$ Ctr = 0;
$ Tmp = "";
For ($ I = 0; $ I {
If ($ ctr = strlen ($ encrypt_key) $ ctr = 0;
$ Tmp. = substr ($ encrypt_key, $ ctr, 1). (substr ($ txt, $ I, 1) ^ substr ($ encrypt_key, $ ctr, 1 ));
$ Ctr ++;
}
Return keyED ($ tmp, $ key );
}
Function decrypt ($ txt, $ key)
{
$ Txt = keyED ($ txt, $ key );
$ Tmp = "";
For ($ I = 0; $ I {
$ Md5 = substr ($ txt, $ I, 1 );
$ I ++;
$ Tmp. = (substr ($ txt, $ I, 1) ^ $ md5 );
}
Return $ tmp;
}
$ Key = "YITU.org ";
$ String = "I am an encrypted character ";
// Encrypt $ string, and store it in $ enc_text
$ Enc_text = encrypt ($ string, $ key );
// Decrypt the encrypted text $ enc_text, and store it in $ dec_text
$ Dec_text = decrypt ($ enc_text, $ key );
Print "encrypted text: $ enc_text
";
Print "decrypted text: $ dec_text
";
?> |
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