int main()
{
int i;
crypto_auth_hmacsha512256(a,c,sizeof c,key);
for (i = 0;i < 32;++i) {
printf(",0x%02x",(unsigned int) a[i]);
if (i % 8 == 7) printf("\n");
}
return 0;
}
int crypto_secretbox(
unsigned char *c,
const unsigned char *m,unsigned long long mlen,
const unsigned char *n,
const unsigned char *k
)
{
if (mlen < 32) return -1;
crypto_stream_salsa20_xor(c,m,mlen,n,k);
return crypto_auth_hmacsha512256(c,c + 32,mlen - 32,c);
}
int
crypto_auth_hmacsha512256_verify(const unsigned char *h,
const unsigned char *in,
unsigned long long inlen,
const unsigned char *k)
{
unsigned char correct[32];
crypto_auth_hmacsha512256(correct, in, inlen, k);
return crypto_verify_32(h, correct) | (-(h == correct)) |
sodium_memcmp(correct, h, 32);
}
SODIUM_EXPORT int
crypto_auth_hmacsha512256_ref(unsigned char *out, const unsigned char *in,
unsigned long long inlen, const unsigned char *k)
{
return crypto_auth_hmacsha512256(out, in, inlen, k);
}
static void notify_init(int fd, int udp, struct curve25519_proto *p,
struct curve25519_struct *c, char *home)
{
int fd2, i;
ssize_t err, clen;
size_t us_len, msg_len, pad;
struct ct_proto hdr;
char username[256], path[PATH_MAX], *us, *cbuff, *msg;
unsigned char auth[crypto_auth_hmacsha512256_BYTES], *token;
mt_init_by_random_device();
memset(&hdr, 0, sizeof(hdr));
hdr.flags |= PROTO_FLAG_INIT;
memset(path, 0, sizeof(path));
slprintf(path, sizeof(path), "%s/%s", home, FILE_USERNAM);
fd2 = open_or_die(path, O_RDONLY);
memset(username, 0, sizeof(username));
err = read(fd2, username, sizeof(username));
username[sizeof(username) - 1] = 0;
close(fd2);
token = get_serv_store_entry_auth_token();
if (!token)
syslog_panic("Cannot find auth token for server!\n");
us_len = sizeof(struct username_struct) + crypto_box_zerobytes;
us = xzmalloc(us_len);
err = username_msg(username, strlen(username) + 1,
us + crypto_box_zerobytes,
us_len - crypto_box_zerobytes);
if (unlikely(err))
syslog_panic("Cannot create init message!\n");
clen = curve25519_encode(c, p, (unsigned char *) us, us_len,
(unsigned char **) &cbuff);
if (unlikely(clen <= 0))
syslog_panic("Init encrypt error!\n");
err = crypto_auth_hmacsha512256(auth, (unsigned char *) cbuff, clen, token);
if (unlikely(err))
syslog_panic("Cannot create init hmac message!\n");
pad = mt_rand_int32() % 200;
msg_len = clen + sizeof(auth) + pad;
msg = xzmalloc(msg_len);
memcpy(msg, auth, sizeof(auth));
memcpy(msg + sizeof(auth), cbuff, clen);
for (i = sizeof(auth) + clen; i < msg_len; ++i)
msg[i] = (uint8_t) mt_rand_int32();
hdr.payload = htons((uint16_t) msg_len);
set_sock_cork(fd, udp);
write_exact(fd, &hdr, sizeof(struct ct_proto), 0);
write_exact(fd, msg, msg_len, 0);
set_sock_uncork(fd, udp);
xfree(msg);
xfree(us);
}