Php Encryption Algorithm Implementation Reversible Encryption Algorithm and decryption sharing _ php instance

For most password encryption, we can use md5, sha1, and other methods. This can effectively prevent data leaks, but these methods only apply to data encryption that does not require restoration. For the information to be restored, a reversible encryption and decryption algorithm is required. the following set of PHP functions implement this encryption and decryption method. The encryption algorithm is as follows:

The Code is as follows:

Function encrypt ($ data, $ key)
{
$ Key = md5 ($ key );
$ X = 0;
$ Len = strlen ($ data );
$ L = strlen ($ key );
For ($ I = 0; $ I <$ len; $ I ++)
{
If ($ x = $ l)
{
$ X = 0;
}
$ Char. = $ key {$ x };
$ X ++;
}
For ($ I = 0; $ I <$ len; $ I ++)
{
$ Str. = chr (ord ($ data {$ I}) + (ord ($ char {$ I}) % 256 );
}
Return base64_encode ($ str );
}

The decryption algorithm is as follows:

The Code is as follows:

Function decrypt ($ data, $ key)
{
$ Key = md5 ($ key );
$ X = 0;
$ Data = base64_decode ($ data );
$ Len = strlen ($ data );
$ L = strlen ($ key );
For ($ I = 0; $ I <$ len; $ I ++)
{
If ($ x = $ l)
{
$ X = 0;
}
$ Char. = substr ($ key, $ x, 1 );
$ X ++;
}
For ($ I = 0; $ I <$ len; $ I ++)
{
If (ord (substr ($ data, $ I, 1) <ord (substr ($ char, $ I, 1 )))
{
$ Str. = chr (ord (substr ($ data, $ I, 1) + 256)-ord (substr ($ char, $ I, 1 )));
}
Else
{
$ Str. = chr (ord (substr ($ data, $ I, 1)-ord (substr ($ char, $ I, 1 )));
}
}
Return $ str;
}

An encryption key ($ key) is required for the above encryption and decryption process ).

The Code is as follows:

$ Data = 'php encryption and decryption algorithmic '; // encrypted information
$ Key = '000000'; // key
$ Encrypt = encrypt ($ data, $ key );
$ Decrypt = decrypt ($ encrypt, $ key );
Echo $ encrypt, "\ n", $ decrypt;

The output is similar to the following:

The Code is as follows:

GniCSOzZG + HnS9zcFea7SefNGhXF
PHP encryption and decryption algorithm

From the above results, we can see that this is a set of reversible encryption and decryption algorithms that can be used to encrypt part of the data to be restored.