Decrypt des with openssl_decrypt in PHP

Question

Trying to decrypt a single des encrypted data using this code:

$keyValue ='0123456789abcdef'; //hex value
$encryptedOrderId = '88C10F0B8C084E5F'; //hex value
$binaryEncrypted = hex2bin($encryptedOrderId);
$decodeValueByOnlineTool = '2020202039353538';  // this is hex
$opensslDecrypt = openssl_decrypt(  $encryptedOrderId  ,'DES-ECB', $keyValue, OPENSSL_RAW_DATA , '' );
var_dump($opensslDecrypt);

The output is false. I do not know what wrong I'm doing.

The output from my tool is as follows:

Do you not find it odd that you aren't using keyValue in your call to openssl_decrypt? Did you actually write that code or have you copied it from somewhere without understanding it? I suggest you read the docs for openssl_decrypt. — Luke Joshua Park
– Luke Joshua Park, Commented Jan 18, 2018 at 6:20
sorry for that I some how deleted it from my code check my updates. — Purushotam Sangroula
– Purushotam Sangroula, Commented Jan 18, 2018 at 6:23
DES keys are 64-bits (including parity) in length but the (hint: hex) string that you are passing in is interpreted as being 128-bits. Can you figure out what is wrong from that? Obviously the warning you have is relevant too. — Luke Joshua Park
– Luke Joshua Park, Commented Jan 18, 2018 at 6:24
not actually ,please give an answer if it works i'll mark it correct. you mean to say I need to convert it to binary? — Purushotam Sangroula
– Purushotam Sangroula, Commented Jan 18, 2018 at 6:25
Yes, you do. And fix the IV. I think that one is self explanatory. — Luke Joshua Park
– Luke Joshua Park, Commented Jan 18, 2018 at 6:27

Luke Joshua Park · Accepted Answer · 2018-01-18 07:04:37Z

3

Your inputs are in hex. openssl_decrypt expects binary. Use hex2bin on each input before passing to openssl_decrypt.

openssl_decrypt(hex2bin($encryptedOrderId), 'DES-ECB', hex2bin($keyValue), ...

Remember to convert the result back into hex to get the result you want. Make sure you've set OPENSSL_ZERO_PADDING as per your screenshot.

EDIT: The exact code I used...

$keyValue ='0123456789abcdef'; //hex value
$encryptedOrderId = '88C10F0B8C084E5F'; //hex value
$binaryEncrypted = hex2bin($encryptedOrderId);
$decodeValueByOnlineTool = '2020202039353538';  // this is hex
$opensslDecrypt = openssl_decrypt( $binaryEncrypted  ,'des-ecb', hex2bin($keyValue), OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING , '');
var_dump($opensslDecrypt);

edited Jan 18, 2018 at 7:04

answered Jan 18, 2018 at 6:49

Luke Joshua Park

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9 Comments

Purushotam Sangroula Over a year ago

I did that too. returns false.

Luke Joshua Park Over a year ago

With the no padding?

Purushotam Sangroula Over a year ago

with OPENSSL_ZERO_PADDING in 4th parameter. empty string output

Luke Joshua Park Over a year ago

See the exact code I used above. Definitely works for me.

Purushotam Sangroula Over a year ago

letme check it .

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