CODEWITHSUNDEEP
php
Alisa
Alisa

Reputation: 553

encrypted and decrypted results are different when using mcrypt_ecb() function in php

I am using the following function to encrypt and decrypt

define('KEYVAL',"hgfzhjh");
function encryption($plain_text)
{
$key_value = KEYVAL;
$encrypted_text = mcrypt_ecb(MCRYPT_DES, $key_value, $plain_text, MCRYPT_ENCRYPT);
return $encrypted_text;
}

function decryption($encrypted_text)
{
$key_value = KEYVAL;
$decrypted_text = mcrypt_ecb(MCRYPT_DES, $key_value, $encrypted_text, MCRYPT_DECRYPT);
return $decrypted_text;
}

echo $id = 'abc';
echo "<br />";    
$enc = encryption('abc');
echo $dec = decryption($enc);   
echo "<br />";
echo $dec;
echo "<br />";
echo strcmp($id,$dec);

Although the echo of $enc and $dec is same but the result of strcmp is -5. Why..?

I am fetching data from database using the decrypted result but it is unable to fetch data because both strings are not same. please let me know if I am not using it correctly..

Upvotes: 1

Views: 914

Answers (2)

Shankar Narayana Damodaran
Shankar Narayana Damodaran

Reputation: 68536

If you have doubts, just var_dump your string. var_dump($dec) gives the length of 8, that is why your strcmp gave you -5

Decryption here gives you extra spaces on the end of the string, so make use of a rtrim

You need to trim the decrypted string in the function itself !.

function decryption($encrypted_text)
{
$key_value = KEYVAL;
$decrypted_text = mcrypt_ecb(MCRYPT_DES, $key_value, $encrypted_text, MCRYPT_DECRYPT);
return rtrim($decrypted_text); //Trimming here
}

Btw .. why spaces are getting added ? Have a look at this thread

Upvotes: 1

Deepanshu Goyal
Deepanshu Goyal

Reputation: 2833

trim your encrypted value

$enc = trim(encryption('abc'));

Upvotes: 1

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