> phbgt> Second :
> phbgt>
> phbgt> I want to encyrpt and decrypt a file, using aes-256-cbc.
> phbgt>
> phbgt> First I use
> phbgt> type = EVP_get_cipherbyname("aes-256-cbc") to set the cipher type.
> phbgt>
> phbgt> Then I use EVP_CipherInit(ctx,type,key,iv,enc) to set the key and
> the iv.
> phbgt>
> phbgt> My problem is that I always succed in decrypt the file, even if the
> iv has
> phbgt> not the good value.
>
> Hmm, do you have possibility to check what the IV becomes after you
> initialise? And possibly what low-level function actually does the
> encryption and decryption? If not, make some example code that we can
> test with and send it to us.
>
I had made some test: in fact when I changed the iv, I only changed few
bits, so the uncrypted file "seams" to be the same. (whatever the value of
iv, only the first bloc change). It's ok.
> phbgt> In the man, when you write EVP_CipherInit " always use the
> phbgt> default cipher implementation", is that mean that even using
> phbgt> EVP_get_cipherbyname("aes-256-cbc"), the cipher is not set to
> phbgt> "aes-256-cbc"?
>
With this type of initialisation, EVP_CipherInit use aes-256-cbc. In fact,
it seams that there's no default cipher in openssl.
> If that's the meaning in practice, you've uncovered a bug.
>
> --
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