internal static unsafe extern int crypto_hash_sha256_update( crypto_hash_sha256_state *state, SecureMemoryHandle @in, ulong inlen);
internal static unsafe extern int crypto_hash_sha256_init( crypto_hash_sha256_state *state);
internal static unsafe extern int crypto_hash_sha256_update( crypto_hash_sha256_state *state, byte * @in, ulong inlen);
internal static unsafe extern int crypto_hash_sha256_final( crypto_hash_sha256_state *state, byte * @out);