Function EVP_AEAD_CTX_openv 

pub unsafe extern "C" fn EVP_AEAD_CTX_openv(
    ctx: *const EVP_AEAD_CTX,
    iovec: *const CRYPTO_IOVEC,
    num_iovec: usize,
    out_total_bytes: *mut usize,
    nonce: *const u8,
    nonce_len: usize,
    aadvec: *const CRYPTO_IVEC,
    num_aadvec: usize,
) -> c_int