src/hmac.h

   1 /*Copyright (c) Brian B.
   2
   3   This library is free software; you can redistribute it and/or
   4   modify it under the terms of the GNU Lesser General Public
   5   License as published by the Free Software Foundation; either
   6   version 3 of the License, or (at your option) any later version.
   7   See the file LICENSE included with this distribution for more
   8   information.
   9
  10   Portions Copyright (c) 1994, Regents of the University of California
  11
  12 */
  13 #ifndef __HMAC_H__
  14 #define __HMAC_H__
  15
  16 #include <stdlib.h>
  17 #include <stdint.h>
  18
  19 #define SHA_BLOCK_LEN 64
  20 #define SHA_DIGEST_LEN 32
  21 #define SHA_DIGEST_STRLEN (SHA_DIGEST_LEN * 2 + 1)
  22 #define HMAC_IPAD 0x36
  23 #define HMAC_OPAD 0x5C
  24
  25 typedef struct {
  26     uint32_t state [8];
  27     uint64_t bitcount;
  28     uint8_t buf [SHA_BLOCK_LEN];
  29 } sha_t;
  30 void sha_init (sha_t *ctx);
  31 void sha_update (sha_t *ctx, const uint8_t *data, size_t len);
  32 void sha_final (sha_t *ctx, uint8_t *digest);
  33
  34 typedef struct {
  35     sha_t hash;
  36     uint8_t ipad [SHA_BLOCK_LEN];
  37     uint8_t opad [SHA_BLOCK_LEN];
  38 } hmac_t;
  39 void hmac_init (hmac_t *ctx, uint8_t *key, size_t len);
  40 void hmac_update (hmac_t *ctx, const uint8_t *data, size_t len);
  41 void hmac_final (hmac_t *ctx, uint8_t *dst, size_t len);
  42
  43 #endif