AES_GMAC_Setkey
void AES_GMAC_Setkey(void *, const uint8_t *, u_int);
AES_GMAC_Setkey(&ctx->gmac, key, len);
.Setkey = AES_GMAC_Setkey,
.Setkey = AES_GMAC_Setkey,
.Setkey = AES_GMAC_Setkey,