ed25519/keypair.c

#include "ed25519.h"
#include "sha512.h"
#include "ge.h"



int ed25519_create_keypair(unsigned char *verify_key, unsigned char *sign_key, unsigned char *seed)
{
  unsigned char h[64];
  ge_p3 A;
  int i;

  sha512(seed, 32, h);
  h[0] &= 248;
  h[31] &= 63;
  h[31] |= 64;

  ge_scalarmult_base(&A, h);
  ge_p3_tobytes(verify_key, &A);

  for (i = 0; i < 32; ++i) sign_key[i] = seed[i];
  for (i = 0; i < 32; ++i) sign_key[32 + i] = verify_key[i];
    
  return 0;
}