BF_set_key
BF_set_key(&bf_ks, 16, key16);
BF_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx), key);
void BF_set_key(BF_KEY *key, int len, const unsigned char *data);
void BF_set_key(BF_KEY *, int, unsigned char *);