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
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
#include "crypto_core_hsalsa20.h"
#include "crypto_stream_salsa20.h"
#include "crypto_stream_xsalsa20.h"
#include "randombytes.h"
#include "utils.h"
int
crypto_stream_xsalsa20(unsigned char *c, unsigned long long clen,
const unsigned char *n, const unsigned char *k)
{
unsigned char subkey[32];
int ret;
crypto_core_hsalsa20(subkey, n, k, NULL);
ret = crypto_stream_salsa20(c, clen, n + 16, subkey);
sodium_memzero(subkey, sizeof subkey);
return ret;
}
int
crypto_stream_xsalsa20_xor_ic(unsigned char *c, const unsigned char *m,
unsigned long long mlen, const unsigned char *n,
uint64_t ic, const unsigned char *k)
{
unsigned char subkey[32];
int ret;
crypto_core_hsalsa20(subkey, n, k, NULL);
ret = crypto_stream_salsa20_xor_ic(c, m, mlen, n + 16, ic, subkey);
sodium_memzero(subkey, sizeof subkey);
return ret;
}
int
crypto_stream_xsalsa20_xor(unsigned char *c, const unsigned char *m,
unsigned long long mlen, const unsigned char *n,
const unsigned char *k)
{
return crypto_stream_xsalsa20_xor_ic(c, m, mlen, n, 0ULL, k);
}
size_t
crypto_stream_xsalsa20_keybytes(void)
{
return crypto_stream_xsalsa20_KEYBYTES;
}
size_t
crypto_stream_xsalsa20_noncebytes(void)
{
return crypto_stream_xsalsa20_NONCEBYTES;
}
size_t
crypto_stream_xsalsa20_messagebytes_max(void)
{
return crypto_stream_xsalsa20_MESSAGEBYTES_MAX;
}
void
crypto_stream_xsalsa20_keygen(unsigned char k[crypto_stream_xsalsa20_KEYBYTES])
{
randombytes_buf(k, crypto_stream_xsalsa20_KEYBYTES);
}
|
