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This article focuses on "how to write PHP reversible encryption and decryption algorithm code", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Next let the editor to take you to learn how to write PHP reversible encryption and decryption algorithm code!

For most password encryption, we can use md5, sha1 and other methods. Data leakage can be effectively prevented, but these methods are only applicable to data encryption that does not need to be restored.

For the information that needs to be restored, a reversible encryption and decryption algorithm is needed.

The following set of PHP functions is the way to achieve this encryption and decryption:

The encryption algorithm is as follows:

The copy code is as follows:

Function encrypt ($data, $key)

{

$key = md5 ($key)

$x = 0

$len = strlen ($data)

$l = strlen ($key)

For ($I = 0; $I < $len; $iTunes +)

{

If ($x = = $l)

{

$x = 0

}

$char. = $key {$x}

$xbirthday +

}

For ($I = 0; $I < $len; $iTunes +)

{

$str. = chr (ord ($data {$I}) + (ord ($char {$I})) 256)

}

Return base64_encode ($str)

}

The decryption algorithm is as follows:

The copy 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; $iTunes +)

{

If ($x = = $l)

{

$x = 0

}

$char. = substr ($key, $x, 1)

$xbirthday +

}

For ($I = 0; $I < $len; $iTunes +)

{

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

}

The above encryption and decryption process requires an encryption key (that is, the parameter $key).

The copy code is as follows:

$data = 'PHP encryption and decryption algorithm'; / / encrypted information

$key = '123 keys; / / key

$encrypt = encrypt ($data, $key)

$decrypt = decrypt ($encrypt, $key)

Echo $encrypt, "\ n", $decrypt

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PHP encryption and decryption algorithm

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