src/secp256k1/include/secp256k1_ecdh.h

   1 #ifndef SECP256K1_ECDH_H
   2 #define SECP256K1_ECDH_H
   3
   4 #include "secp256k1.h"
   5
   6 #ifdef __cplusplus
   7 extern "C" {
   8 #endif
   9
  10 /** Compute an EC Diffie-Hellman secret in constant time
  11  *  Returns: 1: exponentiation was successful
  12  *           0: scalar was invalid (zero or overflow)
  13  *  Args:    ctx:        pointer to a context object (cannot be NULL)
  14  *  Out:     result:     a 32-byte array which will be populated by an ECDH
  15  *                       secret computed from the point and scalar
  16  *  In:      pubkey:     a pointer to a secp256k1_pubkey containing an
  17  *                       initialized public key
  18  *           privkey:    a 32-byte scalar with which to multiply the point
  19  */
  20 SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ecdh(
  21   const secp256k1_context* ctx,
  22   unsigned char *result,
  23   const secp256k1_pubkey *pubkey,
  24   const unsigned char *privkey
  25 ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
  26
  27 #ifdef __cplusplus
  28 }
  29 #endif
  30
  31 #endif /* SECP256K1_ECDH_H */