How to use PHP reversible encryption function

This article is about how to use the PHP reversible encryption function. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Many times we need to encrypt and decrypt the data, for example, some data need to be saved in cookie, but the data cannot be easily obtained by users, so we need to encrypt the data and save it to cookie, and then decrypt it when we need to use it.

The encryption process is as follows:

The copy code is as follows:

/ / encrypt the data and write it to cookie

$cookie_data = $this-> encrypt ("nowamagic", $data)

$cookie = array (

'name' = >'$data'

'value' = > $cookie_data

'expire' = > $user_expire

'domain' = >''

'path' = >' /'

'prefix' = >''

);

$this- > input- > set_cookie ($cookie)

/ / encryption

Public function encrypt ($key, $plain_text) {

$plain_text = trim ($plain_text)

$iv = substr (md5 ($key), 0mcryptencrypgetroomivqualified size (MCRYPT_CAST_256,MCRYPT_MODE_CFB))

$plain_text = mcrypt_cfb (MCRYPT_CAST_256, $key, $plain_text, MCRYPT_ENCRYPT, $iv)

Return trim (chop (base64_encode ($clockt)

}

Decrypt it when in use:

If (isset ($_ COOKIE ['data']))

{

/ / use cookie to assign values to session

$_ SESSION ['data'] = decrypt ("nowamagic", $_ COOKIE [' data'])

}

Function decrypt ($key, $clockt) {

$chop = trim (base64_decode ($Centrt)

$iv = substr (md5 ($key), 0mcryptencrypgetroomivqualified size (MCRYPT_CAST_256,MCRYPT_MODE_CFB))

$MCRYPT_DECRYPT = mcrypt_cfb (MCRYPT_CAST_256, $key, $Centrt, MCRYPT_DECRYPT, $iv)

Return trim (chop ($pimpt))

}

The use of this reversible encryption function is recorded here.

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