Christina Penn wrote:
> Here is some example code of me trying to decrypt a partial AES message.
> It doesn't work.. is there a way I can do something like this? It only
works
> if I call DecryptMessage() with the entire encrypted string. Why?
Your DecryptMessage function is specifically designed to require the entire
encrypted string:
if(!EVP_DecryptFinal_ex(&deCTX, plaintext+p_len, &f_len))
cerr << "ERROR in EVP_DecryptFinal_ex" << endl;
See how it calls EVP_DecryptFinal_ex?
As EVP_DecryptInit should only be called at the very start to initialize a
message, so EVP_DecryptFinal_ex should only be called at the very end to
finish a complete message. In the middle, you should only be using
EVP_DecryptUpdate.
DS
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