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
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/* Binary signer/checker using ed25519
*
* Compile with:
* gcc -o sign sign.c -lsodium
*
* Generate a keypair:
* ./sign g
*
* Sign a file:
* ./sign s PRIVATEKEY file.bin signedfile.bin
*
* Check a file:
*
* ./sign c PUBKEY signedfile.bin
*
* NOTE: The signature is appended to the end of the file.
*/
#include <sodium.h>
#include <string.h>
#include "../../testing/misc_tools.h" // hex_string_to_bin
#include "../../toxcore/ccompat.h"
static int load_file(char *filename, unsigned char **result)
{
int size = 0;
FILE *f = fopen(filename, "rb");
if (f == nullptr) {
*result = nullptr;
return -1; // -1 means file opening fail
}
fseek(f, 0, SEEK_END);
size = ftell(f);
fseek(f, 0, SEEK_SET);
*result = (unsigned char *)malloc(size + 1);
if (size != fread(*result, sizeof(char), size, f)) {
free(*result);
fclose(f);
return -2; // -2 means file reading fail
}
fclose(f);
(*result)[size] = 0;
return size;
}
int main(int argc, char *argv[])
{
unsigned char pk[crypto_sign_ed25519_PUBLICKEYBYTES];
unsigned char sk[crypto_sign_ed25519_SECRETKEYBYTES];
if (argc == 2 && argv[1][0] == 'g') {
crypto_sign_ed25519_keypair(pk, sk);
printf("Public key:\n");
int i;
for (i = 0; i < crypto_sign_ed25519_PUBLICKEYBYTES; i++) {
printf("%02X", pk[i]);
}
printf("\nSecret key:\n");
for (i = 0; i < crypto_sign_ed25519_SECRETKEYBYTES; i++) {
printf("%02X", sk[i]);
}
printf("\n");
}
if (argc == 5 && argv[1][0] == 's') {
unsigned char *secret_key = hex_string_to_bin(argv[2]);
unsigned char *data;
int size = load_file(argv[3], &data);
if (size < 0) {
goto fail;
}
unsigned long long smlen;
unsigned char *sm = (unsigned char *)malloc(size + crypto_sign_ed25519_BYTES * 2);
crypto_sign_ed25519(sm, &smlen, data, size, secret_key);
free(secret_key);
if (smlen - size != crypto_sign_ed25519_BYTES) {
goto fail;
}
FILE *f = fopen(argv[4], "wb");
if (f == nullptr) {
goto fail;
}
memcpy(sm + smlen, sm, crypto_sign_ed25519_BYTES); // Move signature from beginning to end of file.
if (fwrite(sm + (smlen - size), 1, smlen, f) != smlen) {
goto fail;
}
fclose(f);
printf("Signed successfully.\n");
}
if (argc == 4 && argv[1][0] == 'c') {
unsigned char *public_key = hex_string_to_bin(argv[2]);
unsigned char *data;
int size = load_file(argv[3], &data);
if (size < 0) {
goto fail;
}
unsigned char *signe = (unsigned char *)malloc(size + crypto_sign_ed25519_BYTES);
memcpy(signe, data + size - crypto_sign_ed25519_BYTES,
crypto_sign_ed25519_BYTES); // Move signature from end to beginning of file.
memcpy(signe + crypto_sign_ed25519_BYTES, data, size - crypto_sign_ed25519_BYTES);
unsigned char *m = (unsigned char *)malloc(size);
unsigned long long mlen;
if (crypto_sign_ed25519_open(m, &mlen, signe, size, public_key) == -1) {
printf("Failed checking sig.\n");
goto fail;
}
printf("Checked successfully.\n");
}
return 0;
fail:
printf("FAIL\n");
return 1;
}
|
