int
crypto_box(unsigned char *c, const unsigned char *m,
unsigned long long mlen, const unsigned char *n,
const unsigned char *pk, const unsigned char *sk)
{
return crypto_box_curve25519xsalsa20poly1305(c, m, mlen, n, pk, sk);
}
/*
* wrapper around crypto_box.
* operates on buf "in place".
* box will be used to hold randomly generated nonce and auth tag data.
*/
static void
pubencryptmsg(uint8_t *buf, unsigned long long msglen, uint8_t *box,
uint8_t *pubkey, uint8_t *seckey)
{
uint8_t *cmsg, *msg;
randombytes(box, ENCNONCEBYTES);
msg = xmalloc(msglen + ENCZEROBYTES);
memset(msg, 0, ENCZEROBYTES);
memcpy(msg + ENCZEROBYTES, buf, msglen);
cmsg = xmalloc(msglen + ENCZEROBYTES);
crypto_box_curve25519xsalsa20poly1305(cmsg, msg, msglen + ENCZEROBYTES,
box, pubkey, seckey);
xfree(msg, msglen + SYMZEROBYTES);
memcpy(box + ENCNONCEBYTES, cmsg + ENCBOXZEROBYTES, ENCBOXBYTES);
memcpy(buf, cmsg + ENCZEROBYTES, msglen);
xfree(cmsg, msglen + ENCZEROBYTES);
}
int
main(int argc, char **argv) {
global_urandom_fd = open("/dev/urandom", O_RDONLY);
if (global_urandom_fd < 0) {
perror("Opening /dev/urandom");
return 1;
}
if (argc != 4)
return usage(argv[0]);
uint32_t target_ip;
if (!ip_parse(&target_ip, argv[1]))
return usage(argv[0]);
const unsigned portnum = strtoul(argv[2], NULL, 10);
uint8_t server_pk[32];
unsigned server_pk_len = sizeof(server_pk);
if (!base32_decode(server_pk, &server_pk_len, (const uint8_t *) argv[3], strlen(argv[3]), 1)) {
perror("base32_decode");
return 1;
}
if (server_pk_len != 32) {
fprintf(stderr, "Invalid server public key\n");
return 1;
}
static const uint8_t query[] =
"\xab\xcd\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x03www\x06google\x03org\x00\x00\x02\x00\x01";
uint8_t pk[32];
crypto_box_curve25519xsalsa20poly1305_keypair(pk, global_secret_key);
uint8_t nonce[24];
uint8_t nonce_and_box[4096];
randombytes(nonce, 12);
memset(nonce + 12, 0, 12);
memset(nonce_and_box, 0, 32);
memcpy(nonce_and_box + 32, query, sizeof(query) - 1);
crypto_box_curve25519xsalsa20poly1305
(nonce_and_box, nonce_and_box, 32 + sizeof(query) - 1, nonce,
server_pk, global_secret_key);
memcpy(nonce_and_box + 4, nonce, 12);
write(1, pk, 32);
write(1, nonce_and_box + 4, 12 + 16 + sizeof(query) - 1);
uint8_t request[4096];
unsigned requestlen = sizeof(request) - 2;
if (!dns_curve_request_build(request + 2, &requestlen,
nonce_and_box + 4, 12 + 16 + sizeof(query) - 1,
pk, (unsigned char *) "\x06google\x03org\x00")) {
perror("dns_curve_request_build");
return 1;
}
requestlen += 2;
const int fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (fd < 0) {
perror("socket");
return 1;
}
struct sockaddr_in sin;
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = target_ip;
sin.sin_port = htons(portnum);
ssize_t n;
do {
n = sendto(fd, request, requestlen, 0, (struct sockaddr *) &sin, sizeof(sin));
} while (n == -1 && errno == EINTR);
if (n < 0) {
perror("sendto");
return 1;
}
return 0;
}
void curve25519_selftest(void)
{
/* Test from the NaCl library */
int i;
unsigned char alicesk[32] = {
0x77, 0x07, 0x6d, 0x0a, 0x73, 0x18, 0xa5, 0x7d,
0x3c, 0x16, 0xc1, 0x72, 0x51, 0xb2, 0x66, 0x45,
0xdf, 0x4c, 0x2f, 0x87, 0xeb, 0xc0, 0x99, 0x2a,
0xb1, 0x77, 0xfb, 0xa5, 0x1d, 0xb9, 0x2c, 0x2a
};
unsigned char bobpk[32] = {
0xde, 0x9e, 0xdb, 0x7d, 0x7b, 0x7d, 0xc1, 0xb4,
0xd3, 0x5b, 0x61, 0xc2, 0xec, 0xe4, 0x35, 0x37,
0x3f, 0x83, 0x43, 0xc8, 0x5b, 0x78, 0x67, 0x4d,
0xad, 0xfc, 0x7e, 0x14, 0x6f, 0x88, 0x2b, 0x4f
};
unsigned char nonce[24] = {
0x69, 0x69, 0x6e, 0xe9, 0x55, 0xb6, 0x2b, 0x73,
0xcd, 0x62, 0xbd, 0xa8, 0x75, 0xfc, 0x73, 0xd6,
0x82, 0x19, 0xe0, 0x03, 0x6b, 0x7a, 0x0b, 0x37
};
/* API requires first 32 bytes to be 0 */
unsigned char m[163] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xbe, 0x07, 0x5f, 0xc5, 0x3c, 0x81, 0xf2, 0xd5,
0xcf, 0x14, 0x13, 0x16, 0xeb, 0xeb, 0x0c, 0x7b,
0x52, 0x28, 0xc5, 0x2a, 0x4c, 0x62, 0xcb, 0xd4,
0x4b, 0x66, 0x84, 0x9b, 0x64, 0x24, 0x4f, 0xfc,
0xe5, 0xec, 0xba, 0xaf, 0x33, 0xbd, 0x75, 0x1a,
0x1a, 0xc7, 0x28, 0xd4, 0x5e, 0x6c, 0x61, 0x29,
0x6c, 0xdc, 0x3c, 0x01, 0x23, 0x35, 0x61, 0xf4,
0x1d, 0xb6, 0x6c, 0xce, 0x31, 0x4a, 0xdb, 0x31,
0x0e, 0x3b, 0xe8, 0x25, 0x0c, 0x46, 0xf0, 0x6d,
0xce, 0xea, 0x3a, 0x7f, 0xa1, 0x34, 0x80, 0x57,
0xe2, 0xf6, 0x55, 0x6a, 0xd6, 0xb1, 0x31, 0x8a,
0x02, 0x4a, 0x83, 0x8f, 0x21, 0xaf, 0x1f, 0xde,
0x04, 0x89, 0x77, 0xeb, 0x48, 0xf5, 0x9f, 0xfd,
0x49, 0x24, 0xca, 0x1c, 0x60, 0x90, 0x2e, 0x52,
0xf0, 0xa0, 0x89, 0xbc, 0x76, 0x89, 0x70, 0x40,
0xe0, 0x82, 0xf9, 0x37, 0x76, 0x38, 0x48, 0x64,
0x5e, 0x07, 0x05
};
unsigned char c[163];
unsigned char result[147] = {
0xf3, 0xff, 0xc7, 0x70, 0x3f, 0x94, 0x00, 0xe5,
0x2a, 0x7d, 0xfb, 0x4b, 0x3d, 0x33, 0x05, 0xd9,
0x8e, 0x99, 0x3b, 0x9f, 0x48, 0x68, 0x12, 0x73,
0xc2, 0x96, 0x50, 0xba, 0x32, 0xfc, 0x76, 0xce,
0x48, 0x33, 0x2e, 0xa7, 0x16, 0x4d, 0x96, 0xa4,
0x47, 0x6f, 0xb8, 0xc5, 0x31, 0xa1, 0x18, 0x6a,
0xc0, 0xdf, 0xc1, 0x7c, 0x98, 0xdc, 0xe8, 0x7b,
0x4d, 0xa7, 0xf0, 0x11, 0xec, 0x48, 0xc9, 0x72,
0x71, 0xd2, 0xc2, 0x0f, 0x9b, 0x92, 0x8f, 0xe2,
0x27, 0x0d, 0x6f, 0xb8, 0x63, 0xd5, 0x17, 0x38,
0xb4, 0x8e, 0xee, 0xe3, 0x14, 0xa7, 0xcc, 0x8a,
0xb9, 0x32, 0x16, 0x45, 0x48, 0xe5, 0x26, 0xae,
0x90, 0x22, 0x43, 0x68, 0x51, 0x7a, 0xcf, 0xea,
0xbd, 0x6b, 0xb3, 0x73, 0x2b, 0xc0, 0xe9, 0xda,
0x99, 0x83, 0x2b, 0x61, 0xca, 0x01, 0xb6, 0xde,
0x56, 0x24, 0x4a, 0x9e, 0x88, 0xd5, 0xf9, 0xb3,
0x79, 0x73, 0xf6, 0x22, 0xa4, 0x3d, 0x14, 0xa6,
0x59, 0x9b, 0x1f, 0x65, 0x4c, 0xb4, 0x5a, 0x74,
0xe3, 0x55, 0xa5
};
crypto_box_curve25519xsalsa20poly1305(c, m, 163, nonce, bobpk, alicesk);
for (i = 16; i < 163; ++i) {
if (c[i] != result[i - 16])
panic("PANIC: crypto selftest failed at pos %d "
"(%u != %u)! :-(\n", i, c[i], result[i]);
}
}
