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// sha3.h
// 19-Nov-11 Markku-Juhani O. Saarinen <mjos@iki.fi>
#ifndef SHA3_H
#define SHA3_H
#include <stddef.h>
#include <stdint.h>
#ifndef KECCAKF_ROUNDS
#define KECCAKF_ROUNDS 24
#endif
#ifndef ROTL64
#define ROTL64(x, y) (((x) << (y)) | ((x) >> (64 - (y))))
#endif
// state context
typedef struct {
union { // state:
uint8_t b[200]; // 8-bit bytes
uint64_t q[25]; // 64-bit words
} st;
int pt, rsiz, mdlen; // these don't overflow
} sha3_ctx_t;
// Compression function.
static void sha3_keccakf(uint64_t st[25]);
// OpenSSL - like interfece
static int sha3_init(sha3_ctx_t *c, int mdlen); // mdlen = hash output in bytes
static int sha3_update(sha3_ctx_t *c, const void *data, size_t len);
static int sha3_final(void *md, sha3_ctx_t *c); // digest goes to md
// compute a sha3 hash (md) of given byte length from "in"
#if 0
static void *sha3(const void *in, size_t inlen, void *md, int mdlen);
#endif
// SHAKE128 and SHAKE256 extensible-output functions
#define shake128_init(c) sha3_init(c, 16)
#define shake256_init(c) sha3_init(c, 32)
#define shake_update sha3_update
static void shake_xof(sha3_ctx_t *c);
static void shake_out(sha3_ctx_t *c, void *out, size_t len);
#endif
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