#include "curve25519.h"

#include <sodium.h>

#include <stddef.h>
#include <stdlib.h>

void init() {
	if(sodium_init() == -1) {
		exit(-1);
	}
}

void sodium_curve25519_keypair_deleter(struct KeyPair* p) {
	sodium_free(p->sec);
	free(p->pub);
}

struct KeyPair curve25519_create_keypair() {
	init();

	unsigned char* sec = (unsigned char*) sodium_malloc(crypto_box_SECRETKEYBYTES);
	unsigned char* pub = (unsigned char*) malloc(crypto_box_PUBLICKEYBYTES);

	randombytes_buf(sec, crypto_box_SECRETKEYBYTES);
	crypto_scalarmult_base(pub, sec);

	return (struct KeyPair){sec, pub, crypto_box_SECRETKEYBYTES, crypto_box_PUBLICKEYBYTES, &sodium_curve25519_keypair_deleter};
}