dear list,

i'm trying to develop a stable aes 256 bit cipher code with the EVP routines.
everything works fine, but i dont seem to get feedback when using
EVP_aes_256_cbc/cfb/ofb() modes, although i use an IV of 32 bytes.

the order of my function callings is as follows:

EVP_CIPHER_CTX_init();
EVP_EncryptInit_ex();
EVP_EncryptUpdate();
EVP_EncryptFinal_ex();

the same applies for the decryption routine with the corresponding functions.

when the plaintext repeats the ciphertext does too, what really shouldnt be
the case with feedback mode.

any ideas?

thanks a lot
best regards

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