1  #ifndef crypto_kdf_hkdf_sha256_H
 2  #define crypto_kdf_hkdf_sha256_H
 3  
 4  #include <stddef.h>
 5  #include <stdint.h>
 6  #include <stdlib.h>
 7  
 8  #include <sodium.h>
 9  //#include "crypto_kdf.h"
10  //#include "crypto_auth_hmacsha256.h"
11  //#include "export.h"
12  
13  #ifdef __cplusplus
14  # ifdef __GNUC__
15  #  pragma GCC diagnostic ignored "-Wlong-long"
16  # endif
17  extern "C" {
18  #endif
19  
20  #define crypto_kdf_hkdf_sha256_KEYBYTES crypto_auth_hmacsha256_BYTES
21  SODIUM_EXPORT
22  size_t crypto_kdf_hkdf_sha256_keybytes(void);
23  
24  #define crypto_kdf_hkdf_sha256_BYTES_MIN 0U
25  SODIUM_EXPORT
26  size_t crypto_kdf_hkdf_sha256_bytes_min(void);
27  
28  #define crypto_kdf_hkdf_sha256_BYTES_MAX (0xff * crypto_auth_hmacsha256_BYTES)
29  SODIUM_EXPORT
30  size_t crypto_kdf_hkdf_sha256_bytes_max(void);
31  
32  SODIUM_EXPORT
33  int crypto_kdf_hkdf_sha256_extract(unsigned char prk[crypto_kdf_hkdf_sha256_KEYBYTES],
34                                     const unsigned char *salt, size_t salt_len,
35                                     const unsigned char *ikm, size_t ikm_len)
36              __attribute__ ((nonnull(4)));
37  
38  SODIUM_EXPORT
39  void crypto_kdf_hkdf_sha256_keygen(unsigned char prk[crypto_kdf_hkdf_sha256_KEYBYTES]);
40  
41  SODIUM_EXPORT
42  int crypto_kdf_hkdf_sha256_expand(unsigned char *out, size_t out_len,
43                                    const char *ctx, size_t ctx_len,
44                                    const unsigned char prk[crypto_kdf_hkdf_sha256_KEYBYTES])
45              __attribute__ ((nonnull(1)));
46  
47  /* ------------------------------------------------------------------------- */
48  
49  typedef struct crypto_kdf_hkdf_sha256_state {
50      crypto_auth_hmacsha256_state st;
51  } crypto_kdf_hkdf_sha256_state;
52  
53  SODIUM_EXPORT
54  size_t crypto_kdf_hkdf_sha256_statebytes(void);
55  
56  SODIUM_EXPORT
57  int crypto_kdf_hkdf_sha256_extract_init(crypto_kdf_hkdf_sha256_state *state,
58                                          const unsigned char *salt, size_t salt_len)
59              __attribute__ ((nonnull(1)));
60  
61  SODIUM_EXPORT
62  int crypto_kdf_hkdf_sha256_extract_update(crypto_kdf_hkdf_sha256_state *state,
63                                            const unsigned char *ikm, size_t ikm_len)
64              __attribute__ ((nonnull));
65  
66  SODIUM_EXPORT
67  int crypto_kdf_hkdf_sha256_extract_final(crypto_kdf_hkdf_sha256_state *state,
68                                           unsigned char prk[crypto_kdf_hkdf_sha256_KEYBYTES])
69              __attribute__ ((nonnull));
70  
71  #ifdef __cplusplus
72  }
73  #endif
74  
75  #endif