pub unsafe extern "C" fn secp256k1_ecdsa_adaptor_encrypt(
    cx: *const Context,
    adaptor_sig162: *mut EcdsaAdaptorSignature,
    seckey32: *const c_uchar,
    enckey: *const PublicKey,
    msg32: *const c_uchar,
    noncefp: EcdsaAdaptorNonceFn,
    ndata: *mut c_void
) -> c_int