static int SRP_user_pwd_set_sv(SRP_user_pwd *vinfo, const char *s,
const char *v)
{
unsigned char tmp[MAX_LEN];
int len;
vinfo->v = NULL;
vinfo->s = NULL;
len = t_fromb64(tmp, sizeof(tmp), v);
if (len < 0)
return 0;
if (NULL == (vinfo->v = BN_bin2bn(tmp, len, NULL)))
return 0;
len = t_fromb64(tmp, sizeof(tmp), s);
if (len < 0)
goto err;
vinfo->s = BN_bin2bn(tmp, len, NULL);
if (vinfo->s == NULL)
goto err;
return 1;
err:
BN_free(vinfo->v);
vinfo->v = NULL;
return 0;
}
static SRP_gN_cache *SRP_gN_new_init(const char *ch)
{
unsigned char tmp[MAX_LEN];
int len;
SRP_gN_cache *newgN = OPENSSL_malloc(sizeof(*newgN));
if (newgN == NULL)
return NULL;
len = t_fromb64(tmp, sizeof(tmp), ch);
if (len < 0)
goto err;
if ((newgN->b64_bn = OPENSSL_strdup(ch)) == NULL)
goto err;
if ((newgN->bn = BN_bin2bn(tmp, len, NULL)))
return newgN;
OPENSSL_free(newgN->b64_bn);
err:
OPENSSL_free(newgN);
return NULL;
}
int
main()
{
int index;
struct t_client * tc;
struct t_preconf *tcp;
struct t_num n;
struct t_num g;
struct t_num s;
struct t_num B;
char username[MAXUSERLEN];
char hexbuf[MAXHEXPARAMLEN];
char buf1[MAXPARAMLEN], buf2[MAXPARAMLEN], buf3[MAXSALTLEN];
unsigned char cbuf[20];
struct t_num * A;
unsigned char * skey;
char pass[128];
printf("Enter username: "******"Enter index (from server): ");
fgets(hexbuf, sizeof(hexbuf), stdin);
index = atoi(hexbuf);
tcp = t_getpreparam(index - 1);
printf("Enter salt (from server): ");
fgets(hexbuf, sizeof(hexbuf), stdin);
s.data = buf3;
s.len = t_fromb64(s.data, hexbuf);
tc = t_clientopen(username, &tcp->modulus, &tcp->generator, &s);
if (tc == 0) {
printf("invalid n, g\n");
exit(1);
}
A = t_clientgenexp(tc);
printf("A (to server): %s\n", t_tob64(hexbuf, A->data, A->len));
t_getpass(pass, 128, "Enter password:"******"Enter B (from server): ");
fgets(hexbuf, sizeof(hexbuf), stdin);
B.data = buf1;
B.len = t_fromb64(B.data, hexbuf);
skey = t_clientgetkey(tc, &B);
printf("Session key: %s\n", t_tohex(hexbuf, skey, 40));
printf("Response (to server): %s\n",
t_tohex(hexbuf, t_clientresponse(tc), RESPONSE_LEN));
printf("Enter server response: ");
fgets(hexbuf, sizeof(hexbuf), stdin);
hexbuf[strlen(hexbuf) - 1] = '\0';
t_fromhex(cbuf, hexbuf);
if (t_clientverify(tc, cbuf) == 0)
printf("Server authentication successful.\n");
else
printf("Server authentication failed.\n");
t_clientclose(tc);
return 0;
}
