This is in C btw.

I'm using the open.ssl lib to find the key value for an encrypted string for an encrpytion.

I know that the expected output for the encrypted string is some hex value

http://www.openssl.org/docs/crypto/EVP_EncryptInit.html

Following the above link, encrytpupdate places the cipher into an unsigned char value.

I have to compare the expected output to the cipher output to see if the keys correct, by going byte by byte, (aka does the expected output match the output from the cipher)

Question :- : Kinda confused on how to take the expected hex output and compare it to the unsigned char cipher output. Like how are you supposed to compare them byte by byte?

This post was edited by lopelurag on Sep 26 2014 02:55pm

Could you provide an actual example of a hex value and the unsigned char buffer to compare it to?

Use memcmp to compare. You need a buffer with data you're going compare your result to.

Yea I figured it out sorry for not replying.

Thanks for the insight though



Didn't think of mem compare, I assume you'd have to malloc for it to be used?

No, you do not.