1// sha3.h 2// 19-Nov-11 Markku-Juhani O. Saarinen <mjos@iki.fi> 3 4#ifndef SHA3_H 5#define SHA3_H 6 7#include <stddef.h> 8#include <stdint.h> 9 10#ifndef KECCAKF_ROUNDS 11#define KECCAKF_ROUNDS 24 12#endif 13 14#ifndef ROTL64 15#define ROTL64(x, y) (((x) << (y)) | ((x) >> (64 - (y)))) 16#endif 17 18// state context 19typedef struct { 20 union { // state: 21 uint8_t b[200]; // 8-bit bytes 22 uint64_t q[25]; // 64-bit words 23 } st; 24 int pt, rsiz, mdlen; // these don't overflow 25} sha3_ctx_t; 26 27// Compression function. 28static void sha3_keccakf(uint64_t st[25]); 29 30// OpenSSL - like interfece 31static int sha3_init(sha3_ctx_t *c, int mdlen); // mdlen = hash output in bytes 32static int sha3_update(sha3_ctx_t *c, const void *data, size_t len); 33static int sha3_final(void *md, sha3_ctx_t *c); // digest goes to md 34 35// compute a sha3 hash (md) of given byte length from "in" 36#if 0 37static void *sha3(const void *in, size_t inlen, void *md, int mdlen); 38#endif 39 40// SHAKE128 and SHAKE256 extensible-output functions 41#define shake128_init(c) sha3_init(c, 16) 42#define shake256_init(c) sha3_init(c, 32) 43#define shake_update sha3_update 44 45static void shake_xof(sha3_ctx_t *c); 46static void shake_out(sha3_ctx_t *c, void *out, size_t len); 47 48#endif 49 50