I programming using BIO and I have a question about the BIO_set_cipher 
parameter. Now,i did my research and I read that 

"BIO_set_cipher() sets the cipher of BIO <b> to cipher using key key and IV iv. 
enc should be set to 1 for encryption and zero for decryption".

So correct me if im wrong, but all i would have to do to decrpyt something is 
to change 
 
BIO_set_cipher(cipher, EVP_aes_256_ecb(), key, NULL, 1); 
toBIO_set_cipher(cipher, EVP_aes_256_ecb(), key, NULL, 0); ?                    
                 

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