Qt + OpenSSL & EVP_DecryptFinal_ex error bad decrypt

qDebug

I wonder if there is some one out there using OpenSSL EVP + Qt successfully? Most of the examples are outdated and not working. And if i ask, i always hear: try something else, it is better.

SGaist

Hi,

Did you got the OpenSSL part working without Qt ?
What examples are you referring to ?

qDebug

Hi SGaist!

I'm using

vh/0fb1R3awZqWeKpYDqlCafaRS7s49EIAPBmZXKgLo=

for testing. The encoded string ist "this is a test". My key is "test" (md5).

echo vh/0fb1R3awZqWeKpYDqlCafaRS7s49EIAPBmZXKgLo= | openssl.exe enc -d -a -A -aes-128-cbc -iv be1ff47dbd51ddac19a9678aa580ea94 -K 098f6bcd4621d373cade4e832627b4f6

This works, it gets decrypted as expected like:

YÈ])-EÖºà¯ÌSå+£gthis is a test

In my code i get a bad decrypt. I did google a lot about what may the problem. I did test and try other OpenSSL versions as well. The only think i did not try yet, is building OpenSSL myself but i'm not sure if this makes any difference.

Thanks!

SGaist

There's no need to build your own version of OpenSSL,. My question was rather: did you got EVP API working without using Qt at all ?

qDebug

Like in Visual Studio? No. Since i plan to use it in Qt i started here.

SGaist

No, I mean, just using plain C with char arrays etc.

qDebug

No, i did not.

SGaist

Then you should start by doing that. Ensure that you get it working correctly with the raw API and then you can start integrating it your GUI application.

qDebug

OK, so no one got it working in Qt yet.

Thanks.

jsulm

@qDebug said in Qt + OpenSSL & EVP_DecryptFinal_ex error bad decrypt:

OK, so no one got it working in Qt yet.

How do you know?

qDebug

This is my superpower, i can tell.

I'm right as long as some one proves me wrong ;-)