aesxcbc_ctx
uint8_t ctx[sizeof(aesxcbc_ctx)];
aesxcbc_ctx *ctx;
aesxcbc_ctx *ctx;
aesxcbc_ctx *ctx;
aesxcbc_ctx aesxcbcctx;
&auth_hash_aes_xcbc_mac_96, sizeof(aesxcbc_ctx),