from nx_crypto_sha2.h:98
UINT _nx_crypto_method_sha256_init(struct NX_CRYPTO_METHOD_STRUCT *method,
UCHAR *key,
NX_CRYPTO_KEY_SIZE key_size_in_bits,
VOID **handle,
VOID *crypto_metadata,
ULONG crypto_metadata_size);
Implemented in nx_crypto_sha2.c:631