#include <stdint.h>

#include "util.h"
#include "sha2.h"

/* Hashes:
 *   SHA-224
 *   SHA-256
 *   SHA-384
 *   SHA-512
 *   SHA-512/224
 *   SHA-512/256
 */

/* From Fitz */
typedef struct {
	unsigned int state[8];
	unsigned int count[2];
	union {
		unsigned char u8[64];
		unsigned int u32[16];
	} buffer;
} fz_sha256;

void fz_sha256_init(fz_sha256 *state);
void fz_sha256_update(fz_sha256 *state, const unsigned char *input, unsigned int inlen);
void fz_sha256_final(fz_sha256 *state, unsigned char digest[32]);

/* SHA-256 */
void sha256_hash(uint8_t out[32], const uint8_t *data, int len)
{
	fz_sha256 state = {};

	fz_sha256_init(&state);
	fz_sha256_update(&state, data, len);
	fz_sha256_final(&state, out);
}

/* Test */
void sha256_test(void)
{
	uint8_t in[]    = "hello";
	uint8_t out[32] = {};

	sha256_hash(out, in, sizeof(in)-1);

	hexdump("Input:",  "\t%04x: ", in,  sizeof(in)-1);
	hexdump("Output:", "\t%04x: ", out, sizeof(out));
}