secp256k1__ecdh_8h_source.html

 #ifndef SECP256K1_ECDH_H
 #define SECP256K1_ECDH_H

 #include "secp256k1.h"

 #ifdef __cplusplus
 extern "C" {
 #endif

 typedef int (*secp256k1_ecdh_hash_function)(
   unsigned char *output,
   const unsigned char *x32,
   const unsigned char *y32,
   void *data
 );

 SECP256K1_API extern const secp256k1_ecdh_hash_function secp256k1_ecdh_hash_function_sha256;

 SECP256K1_API extern const secp256k1_ecdh_hash_function secp256k1_ecdh_hash_function_default;

 SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ecdh(
   const secp256k1_context* ctx,
   unsigned char *output,
   const secp256k1_pubkey *pubkey,
   const unsigned char *seckey,
   secp256k1_ecdh_hash_function hashfp,
   void *data
 ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);

 #ifdef __cplusplus
 }
 #endif

 #endif /* SECP256K1_ECDH_H */
SECP256K1_WARN_UNUSED_RESULT
#define SECP256K1_WARN_UNUSED_RESULT
Warning attributes NONNULL is not used if SECP256K1_BUILD is set to avoid the compiler optimizing out...
Definition: secp256k1.h:150

secp256k1_ecdh_hash_function_sha256
SECP256K1_API const secp256k1_ecdh_hash_function secp256k1_ecdh_hash_function_sha256
An implementation of SHA256 hash function that applies to compressed public key.
Definition: main_impl.h:26

secp256k1_context_struct
Definition: secp256k1.c:70

secp256k1_ecdh_hash_function_default
SECP256K1_API const secp256k1_ecdh_hash_function secp256k1_ecdh_hash_function_default
A default ECDH hash function (currently equal to secp256k1_ecdh_hash_function_sha256).
Definition: main_impl.h:27

ctx
static secp256k1_context * ctx
Definition: tests.c:36

SECP256K1_ARG_NONNULL
#define SECP256K1_ARG_NONNULL(_x)
Definition: secp256k1.h:155

secp256k1_ecdh
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ecdh(const secp256k1_context *ctx, unsigned char *output, const secp256k1_pubkey *pubkey, const unsigned char *seckey, secp256k1_ecdh_hash_function hashfp, void *data) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4)
Compute an EC Diffie-Hellman secret in constant time.
Definition: main_impl.h:29

secp256k1.h

secp256k1_ecdh_hash_function
int(* secp256k1_ecdh_hash_function)(unsigned char *output, const unsigned char *x32, const unsigned char *y32, void *data)
A pointer to a function that hashes an EC point to obtain an ECDH secret.
Definition: secp256k1_ecdh.h:21

SECP256K1_API
#define SECP256K1_API
Definition: secp256k1.h:140

secp256k1_pubkey
Opaque data structure that holds a parsed and valid public key.
Definition: secp256k1.h:67