1 #ifndef crypto_scalarmult_curve25519_H
2 #define crypto_scalarmult_curve25519_H
3 
4 #include <stddef.h>
5 
6 #include "export.h"
7 
8 #ifdef __cplusplus
9 extern "C" {
10 #endif
11 
12 #define crypto_scalarmult_curve25519_BYTES 32U
13 SODIUM_EXPORT
14 size_t crypto_scalarmult_curve25519_bytes(void);
15 
16 #define crypto_scalarmult_curve25519_SCALARBYTES 32U
17 SODIUM_EXPORT
18 size_t crypto_scalarmult_curve25519_scalarbytes(void);
19 
20 /*
21  * NOTE: Do not use the result of this function directly.
22  *
23  * Hash the result with the public keys in order to compute a shared
24  * secret key: H(q || client_pk || server_pk)
25  *
26  * Or unless this is not an option, use the crypto_kx() API instead.
27  */
28 SODIUM_EXPORT
29 int crypto_scalarmult_curve25519(unsigned char *q, const unsigned char *n,
30                                  const unsigned char *p)
31             __attribute__ ((warn_unused_result));
32 
33 SODIUM_EXPORT
34 int crypto_scalarmult_curve25519_base(unsigned char *q, const unsigned char *n);
35 
36 #ifdef __cplusplus
37 }
38 #endif
39 
40 #endif
41