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Snippet Name: Reversible Encryption in PHP

Description: Mcrypt is a PHP function that uses encryption algorithms. It can be used to encrypt and decrypt data.

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Language: PHP
Highlight Mode: PHP
Last Modified: February 19th, 2010

$string = "Mary had a little lamb.";
$key = "My Secret Key";
// Encryption Algorithm
// Create the initialization vector for increased security.
$iv = mcrypt_create_iv(mcrypt_get_iv_size($alg, MCRYPT_MODE_ECB), MCRYPT_RAND);
// Output the original string
PRINT "The original string is: $string <p>";
// Encrypt $string
$encrypted_string = mcrypt_encrypt($alg, $key, $string, MCRYPT_MODE_CBC, $iv);
// Convert to hexadecimal and output to browser
PRINT "The encrypted string is: ".BIN2HEX($encrypted_string)."<p>";
$decrypted_string = mcrypt_decrypt($alg, $key, $encrypted_string, MCRYPT_MODE_CBC, $iv);
PRINT "The decrypted string is: $decrypted_string";

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