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
      19  typedef 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.
      28  static void sha3_keccakf(uint64_t st[25]);
      29  
      30  // OpenSSL - like interfece
      31  static int sha3_init(sha3_ctx_t *c, int mdlen);    // mdlen = hash output in bytes
      32  static int sha3_update(sha3_ctx_t *c, const void *data, size_t len);
      33  static 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
      37  static 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  
      45  static void shake_xof(sha3_ctx_t *c);
      46  static void shake_out(sha3_ctx_t *c, void *out, size_t len);
      47  
      48  #endif
      49