struct cryptx_hash_sha256 {
	uint8_t data[64];		/**< holds sha-256 block for transformation */
	uint8_t datalen;		/**< holds the current length of data in data[64] */
	uint8_t bitlen[8];		/**< holds the current length of transformed data */
	uint32_t state[8];		/**< holds hash state for transformed data */
};

typedef union {
	struct cryptx_hash_sha256;
} cryptx_hash_internal_h;


struct cryptx_hash_ctx {
	bool (*init)(void* ctx);
	void (*update)(void* ctx, const void* data, size_t len);
	void (*final)(void* ctx, void* output);
	cryptx_hash_internal_h meta;
	uint8_t digest_len;
};