7 void ed25519_sign(unsigned char *signature, const unsigned char *message, size_t message_len, const unsigned char *public_key, const unsigned char *private_key) {
9 unsigned char hram[64];
15 sha512_update(&hash, private_key + 32, 32);
16 sha512_update(&hash, message, message_len);
17 sha512_final(&hash, r);
20 ge_scalarmult_base(&R, r);
21 ge_p3_tobytes(signature, &R);
24 sha512_update(&hash, signature, 32);
25 sha512_update(&hash, public_key, 32);
26 sha512_update(&hash, message, message_len);
27 sha512_final(&hash, hram);
30 sc_muladd(signature + 32, hram, private_key, r);