#include <string.h>
#include "ed25519.h"
#include "sha512.h"
#include "ge.h"
#include "sc.h"
void ed25519_sign(unsigned char *signature, const unsigned char *message, size_t message_len, const unsigned char *private_key) {
sha512_context hash;
unsigned char hram[64];
unsigned char nonce[64];
unsigned char az[64];
ge_p3 R;
sha512(private_key, 32, az);
az[0] &= 248;
az[31] &= 63;
az[31] |= 64;
sha512_init(&hash);
sha512_update(&hash, az + 32, 32);
sha512_update(&hash, message, message_len);
sha512_final(&hash, nonce);
memmove(signature + 32, private_key + 32, 32);
sc_reduce(nonce);
ge_scalarmult_base(&R, nonce);
ge_p3_tobytes(signature, &R);
sha512_init(&hash);
sha512_update(&hash, signature, 64);
sha512_update(&hash, message, message_len);
sha512_final(&hash, hram);
sc_reduce(hram);
sc_muladd(signature + 32, hram, az, nonce);
memset(az, 0, sizeof(az));
memset(nonce, 0, sizeof(nonce));
}