Merge pull request #1191 from sfackler/fix-seal

                enc_key_ptrs.push(enc_key_ptr);

                pub_key_ptrs.push(key.as_ptr());

            }

            let mut iv = cipher.iv_len().map(|len| Vec::with_capacity(len));

            let mut iv = cipher.iv_len().map(|len| vec![0; len]);

            let iv_ptr = iv.as_mut().map_or(ptr::null_mut(), |v| v.as_mut_ptr());

            let mut enc_key_lens = vec![0; enc_keys.len()];

    {

        unsafe {

            assert!(encrypted_key.len() <= c_int::max_value() as usize);

            assert!(cipher.iv_len().is_none() || iv.is_some());

            match (cipher.iv_len(), iv) {

                (Some(len), Some(iv)) => assert_eq!(len, iv.len(), "IV length mismatch"),

                (None, None) => {}

                (Some(_), None) => panic!("an IV was required but not provided"),

                (None, Some(_)) => panic!("an IV was provided but not required"),

            }

            let ctx = cvt_p(ffi::EVP_CIPHER_CTX_new())?;

            cvt(ffi::EVP_OpenInit(