PHP mcrypt error, unsuccessful decryption

Question

The code below does not decrypt the plaintext correctly. Does anyone know why the decrypt will not give me the correct plain text?

<?php

$key = "ShHhd8a08JhJiho98ayslcjh";
$plaintext = "Let us meet at 9 o'clock at the secret place.";
$cyphertext = "arTdPqWOg6VppOqUD6mGITjb24+x5vJjfAufNQ4DN7rVEtpDmhFnMVM+W/WFlksR";


$encrypted = mcrypt_encrypt(MCRYPT_3DES, $key, $plaintext, MCRYPT_MODE_ECB);
$decrypted = mcrypt_decrypt(MCRYPT_3DES, $key, $cyphertext, MCRYPT_MODE_ECB);

echo base64_encode($encrypted)."</br>";
echo base64_encode($decrypted)."</br>";
?>

Instead of echo base64_encode($decrypted), why don't you.. echo the $decrypted? — Michael J.V.
– Michael J.V., Commented Jul 6, 2011 at 15:53

Marc B · Accepted Answer · 2011-07-06 15:54:52Z

1

Your cyphertext looks to be base64-encoded already, so you're comparing apples/oranges. Assuming your $cyphertext is correctly generated in the first place, you'd have to compare

$cyphertext == base64_encode($encrypted)

to get a valid comparison, or

base64_decode($cyphertext) == $encrypted

answered Jul 6, 2011 at 15:54

Marc B

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1 Comment

Shane Chin Over a year ago

Thanks Mark, I was looking at it for fifteen minutes completely dumbfounded.

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