1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
/*
20241114
Jan Mojzis
Public domain.
*/
#include "buf.h"
#include "crypto.h"
#include "purge.h"
#include "crypto_int16.h"
#include "sshcrypto.h"
int curve25519_enc(unsigned char *c, unsigned char *k,
const unsigned char *pk) {
unsigned char onetimesk[crypto_dh_x25519_SECRETKEYBYTES];
long long i;
unsigned int d = 0;
crypto_dh_x25519_keypair(/*onetimepk*/ c, onetimesk);
crypto_dh_x25519(k, pk, onetimesk);
purge(onetimesk, sizeof onetimesk);
for (i = 0; i < crypto_dh_x25519_BYTES; ++i) d |= k[i];
return crypto_int16_zero_mask(d);
}
void curve25519_putkemkey(struct buf *b, const unsigned char *x) {
buf_putsharedsecret(b, x, crypto_dh_x25519_BYTES);
}
|
