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#include <limits.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "core.h"
#include "crypto_box_curve25519xchacha20poly1305.h"
#include "crypto_core_hchacha20.h"
#include "crypto_hash_sha512.h"
#include "crypto_scalarmult_curve25519.h"
#include "crypto_secretbox_xchacha20poly1305.h"
#include "private/common.h"
#include "randombytes.h"
#include "utils.h"
int
crypto_box_curve25519xchacha20poly1305_seed_keypair(unsigned char *pk,
unsigned char *sk,
const unsigned char *seed)
{
unsigned char hash[64];
crypto_hash_sha512(hash, seed, 32);
memcpy(sk, hash, 32);
sodium_memzero(hash, sizeof hash);
return crypto_scalarmult_curve25519_base(pk, sk);
}
int
crypto_box_curve25519xchacha20poly1305_keypair(unsigned char *pk,
unsigned char *sk)
{
randombytes_buf(sk, 32);
return crypto_scalarmult_curve25519_base(pk, sk);
}
int
crypto_box_curve25519xchacha20poly1305_beforenm(unsigned char *k,
const unsigned char *pk,
const unsigned char *sk)
{
static const unsigned char zero[16] = { 0 };
unsigned char s[32];
if (crypto_scalarmult_curve25519(s, sk, pk) != 0) {
return -1;
}
return crypto_core_hchacha20(k, zero, s, NULL);
}
int
crypto_box_curve25519xchacha20poly1305_detached_afternm(
unsigned char *c, unsigned char *mac, const unsigned char *m,
unsigned long long mlen, const unsigned char *n, const unsigned char *k)
{
return crypto_secretbox_xchacha20poly1305_detached(c, mac, m, mlen, n, k);
}
int
crypto_box_curve25519xchacha20poly1305_detached(
unsigned char *c, unsigned char *mac, const unsigned char *m,
unsigned long long mlen, const unsigned char *n, const unsigned char *pk,
const unsigned char *sk)
{
unsigned char k[crypto_box_curve25519xchacha20poly1305_BEFORENMBYTES];
int ret;
COMPILER_ASSERT(crypto_box_curve25519xchacha20poly1305_BEFORENMBYTES >=
crypto_secretbox_xchacha20poly1305_KEYBYTES);
if (crypto_box_curve25519xchacha20poly1305_beforenm(k, pk, sk) != 0) {
return -1;
}
ret = crypto_box_curve25519xchacha20poly1305_detached_afternm(c, mac, m,
mlen, n, k);
sodium_memzero(k, sizeof k);
return ret;
}
int
crypto_box_curve25519xchacha20poly1305_easy_afternm(unsigned char *c,
const unsigned char *m,
unsigned long long mlen,
const unsigned char *n,
const unsigned char *k)
{
if (mlen > crypto_box_curve25519xchacha20poly1305_MESSAGEBYTES_MAX) {
sodium_misuse();
}
return crypto_box_curve25519xchacha20poly1305_detached_afternm(
c + crypto_box_curve25519xchacha20poly1305_MACBYTES, c, m, mlen, n, k);
}
int
crypto_box_curve25519xchacha20poly1305_easy(
unsigned char *c, const unsigned char *m, unsigned long long mlen,
const unsigned char *n, const unsigned char *pk, const unsigned char *sk)
{
if (mlen > crypto_box_curve25519xchacha20poly1305_MESSAGEBYTES_MAX) {
sodium_misuse();
}
return crypto_box_curve25519xchacha20poly1305_detached(
c + crypto_box_curve25519xchacha20poly1305_MACBYTES, c, m, mlen, n, pk,
sk);
}
int
crypto_box_curve25519xchacha20poly1305_open_detached_afternm(
unsigned char *m, const unsigned char *c, const unsigned char *mac,
unsigned long long clen, const unsigned char *n, const unsigned char *k)
{
return crypto_secretbox_xchacha20poly1305_open_detached(m, c, mac, clen, n,
k);
}
int
crypto_box_curve25519xchacha20poly1305_open_detached(
unsigned char *m, const unsigned char *c, const unsigned char *mac,
unsigned long long clen, const unsigned char *n, const unsigned char *pk,
const unsigned char *sk)
{
unsigned char k[crypto_box_curve25519xchacha20poly1305_BEFORENMBYTES];
int ret;
if (crypto_box_curve25519xchacha20poly1305_beforenm(k, pk, sk) != 0) {
return -1;
}
ret = crypto_box_curve25519xchacha20poly1305_open_detached_afternm(
m, c, mac, clen, n, k);
sodium_memzero(k, sizeof k);
return ret;
}
int
crypto_box_curve25519xchacha20poly1305_open_easy_afternm(
unsigned char *m, const unsigned char *c, unsigned long long clen,
const unsigned char *n, const unsigned char *k)
{
if (clen < crypto_box_curve25519xchacha20poly1305_MACBYTES) {
return -1;
}
return crypto_box_curve25519xchacha20poly1305_open_detached_afternm(
m, c + crypto_box_curve25519xchacha20poly1305_MACBYTES, c,
clen - crypto_box_curve25519xchacha20poly1305_MACBYTES, n, k);
}
int
crypto_box_curve25519xchacha20poly1305_open_easy(
unsigned char *m, const unsigned char *c, unsigned long long clen,
const unsigned char *n, const unsigned char *pk, const unsigned char *sk)
{
if (clen < crypto_box_curve25519xchacha20poly1305_MACBYTES) {
return -1;
}
return crypto_box_curve25519xchacha20poly1305_open_detached(
m, c + crypto_box_curve25519xchacha20poly1305_MACBYTES, c,
clen - crypto_box_curve25519xchacha20poly1305_MACBYTES, n, pk, sk);
}
size_t
crypto_box_curve25519xchacha20poly1305_seedbytes(void)
{
return crypto_box_curve25519xchacha20poly1305_SEEDBYTES;
}
size_t
crypto_box_curve25519xchacha20poly1305_publickeybytes(void)
{
return crypto_box_curve25519xchacha20poly1305_PUBLICKEYBYTES;
}
size_t
crypto_box_curve25519xchacha20poly1305_secretkeybytes(void)
{
return crypto_box_curve25519xchacha20poly1305_SECRETKEYBYTES;
}
size_t
crypto_box_curve25519xchacha20poly1305_beforenmbytes(void)
{
return crypto_box_curve25519xchacha20poly1305_BEFORENMBYTES;
}
size_t
crypto_box_curve25519xchacha20poly1305_noncebytes(void)
{
return crypto_box_curve25519xchacha20poly1305_NONCEBYTES;
}
size_t
crypto_box_curve25519xchacha20poly1305_macbytes(void)
{
return crypto_box_curve25519xchacha20poly1305_MACBYTES;
}
size_t
crypto_box_curve25519xchacha20poly1305_messagebytes_max(void)
{
return crypto_box_curve25519xchacha20poly1305_MESSAGEBYTES_MAX;
}
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