Php mcrypt not decrypting data required while using cbc mode

Question

i have the below code for encryption , but the problem is its not decrypting the data as reqired

$salt ='whatever_you_want';

$en= simple_encrypt('data');
echo simple_decrypt($en);
function simple_encrypt($text)
{
    global $salt;
    return trim(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $salt, $text, MCRYPT_MODE_CBC, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC), MCRYPT_RAND))));
}

function simple_decrypt($text)
{
    global $salt;
    return trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $salt, base64_decode($text), MCRYPT_MODE_CBC, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC), MCRYPT_RAND)));
}

the problem is it encrypts and each time it generates a new encrypted text as i want it to happen but the decryption is not happening

im getting something like this

%B…*¥   Þ‚á+ËU:L|(øŽ«úÐ9ÇvÉêÿ¿Ïg

any insight would be appreciated guys :)

You're not saying what exactly the problem is and what happens? — Pekka, May 15 '13 at 17:37

score 0 · Answer 1 · answered May 15 '13 at 18:56

0

When decrypting, you need to use the same IV and key as when encrypting.

Your encrypt function needs to return the IV as well as the encrypted data. That IV should then be sent to the decrypt function along with the data and the key.

answered May 15 '13 at 18:56

gen_Eric

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Php mcrypt not decrypting data required while using cbc mode

1 Answers1