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Unable to decrypt data with mcrypt ..

13 New Member
I am encrypting the data with blowfish CBC mode in C using openssl.
I am trying to decrypt the data with the key using PHP mycrypt.But it does not give me the actual data but some garbage text.I am able to decrypt and encrypt with mcrypt but if i encrypt with c i am unable to decrypt with PHP.
Mar 2 '10 #1
16 7145
5,058 Recognized Expert Expert

Not much we can do for you without seeing your code, I'm afraid.
Mar 2 '10 #2
13 New Member
Oh certainly..
I am using command line ssl to encrypt file using blowfish CBC mode.

The decryption code is using mcrypt.
Expand|Select|Wrap|Line Numbers
  1. <?php
  2. //base 64 decoding the encrypted data.
  3. $data = base64_decode('BdRY7DN8iPDdjdsevowiZQ==');
  4. $key ='12345678';
  5. $iv ='1234';
  7. $res2 = mcrypt_decrypt(MCRYPT_BLOWFISH,$key,$data,MCRYPT_MODE_CBC,$iv);
  8. echo $res2;
  9. ?>
Mar 2 '10 #3
13 New Member
Any ideas?
Mar 3 '10 #4
5,058 Recognized Expert Expert
I can't see anything wrong with that, unless:
  1. Your $key or $iv are incorrect.
  2. You input data is invalid
  3. Your C code is doing something wrong. - Which, honestly, is a lot more likely than your PHP code being wrong.
  4. ... Nope, that's all I've got.
One thing, though. Why do you decrypt the data as Base64 before sending it to Mcrypt?
Mar 3 '10 #5
13 New Member
hi,,thanks for the input.
I am doing base64 decode because data that i get as encrypted is garbage type.doing base64 helps to make it easy to send.

Mar 4 '10 #6
13 New Member
Hello friends.I have been trying to encrypt data in C and decrypt in PHP.SO far no success.:(
I want to know if any of you have done encryption in C and PHP.
If yes,please let me know and how.
I encrypt data in c and when in decrypt in php,i get vague characters.
Mar 9 '10 #7
5,000 Recognized Expert Expert
Are you sure you are using the same encryption algorithim. If you encrypt something in C and write the encrypted text to a plain old text file, then you should be able to take that to any platform and decrypt it.

If you encrypted file that you encrypted in C will not decrypt using PHP then I would blame the user not the technology.
Mar 9 '10 #8
13 New Member
I do agree that but cross platform encryption has much more that just key and iv like padding,file format etc .
I want to know where i am missing those details and are there more to be counted.I guess person who has done this in php and C is the best judge.

regards all
Mar 9 '10 #9
5,000 Recognized Expert Expert
does it say that mcrypt_decrypt needs a $data value that has been base64_decoded?

That would be my first suspicion.
Mar 9 '10 #10

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