from nx_crypto_hkdf.h:72
typedef struct NX_CRYPTO_HKDF_STRUCT
{
UCHAR *nx_crypto_hkdf_salt;
NX_CRYPTO_KEY_SIZE nx_crypto_hkdf_salt_length;
UCHAR *nx_crypto_hkdf_ikm;
UINT nx_crypto_hkdf_ikm_length;
UCHAR *nx_crypto_hkdf_info;
UINT nx_crypto_hkdf_info_size;
UCHAR nx_crypto_hkdf_prk[64];
UINT nx_crypto_hkdf_prk_size;
NX_CRYPTO_METHOD *nx_crypto_hmac_method;
NX_CRYPTO_METHOD *nx_crypto_hash_method;
UCHAR nx_crypto_hkdf_temp_T[120];
UCHAR nx_crypto_hmac_metadata[sizeof(NX_CRYPTO_SHA512_HMAC)];
UCHAR *nx_crypto_hmac_output;
UINT nx_crypto_hmac_output_size;
} NX_CRYPTO_HKDF;