Encrypting the variable with password in PHP [duplicate] - php

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Closed 10 years ago.
Possible Duplicate:
Two-way encryption in PHP
I need a PHP script that encrypts a variable with password. I don't mean hash like md5($var); or sha1($var);
I need a script that could make (for example) md5($var); hash but also get from md5($var); the useful string.
Expectation like
$password = "SomePassword";
$data = "TheVerySecretString";
$encrypted = TheEncyptionFunctionINeed($password, $data); // Output some useless strings
$decrypted = TheDecryptionFunctionINeed($password, $data); // Output: "TheVerySecretString"

Answer 1

Two-way encryption in PHP
Sry to open this up a couple years later, but I think it's important
since it's in the top search rankings...
PHP 5.3 has introduced a new encryption method that is really easy to
use.
It's openssl_encrypt and openssl_decrypt...It's not well documented
here, so here's a simple example..
$textToEncrypt = "My super secret information.";
$encryptionMethod = "AES-256-CBC"; // AES is used by the U.S. gov't to encrypt top secret documents.
$secretHash = "25c6c7ff35b9979b151f2136cd13b0ff";
//To encrypt
$encryptedMessage = openssl_encrypt($textToEncrypt, $encryptionMethod, $secretHash);
//To Decrypt
$decryptedMessage = openssl_decrypt($encryptedMessage, $encryptionMethod, $secretHash);
//Result
echo "Encrypted: $encryptedMessage <br>Decrypted: $decryptedMessage";

Answer 2

Here are 2 functions:
function encryptData($value){
$key = "top secret key";
$text = $value;
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
$crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv);
return $crypttext;
}
function decryptData($value){
$key = "top secret key";
$crypttext = $value;
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
$decrypttext = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $crypttext, MCRYPT_MODE_ECB, $iv);
return trim($decrypttext);
}
?>
check the manual for functions: mcrypt_encrypt and mcrypt_decrypt