diff --git a/literature/2006_how_to_obtain_full_privacy_in_auctions.pdf b/literature/2006_how_to_obtain_full_privacy_in_auctions.pdf
new file mode 100644
index 0000000..0391554
Binary files /dev/null and b/literature/2006_how_to_obtain_full_privacy_in_auctions.pdf differ
diff --git a/smc.c b/smc.c
index e065f8a..e3e90cf 100644
--- a/smc.c
+++ b/smc.c
@@ -24,12 +24,13 @@
 GEN
 smc_hextodec (char *s)                      /* int */
 {
-	long i, tmp;
+	unsigned int i, tmp;
 	GEN ret = gen_0;                        /* int */
 	GEN v = gtovecsmall (strtoGENstr (s));  /* vecsmall */
 
 	for (i = 1; i < lg (v); ++i)
 	{
+		///TODO: scanf instead of if
 		if ((v[i] >= '0') && (v[i] <= '9'))
 			tmp = v[i] - '0';
 		else if ((v[i] >= 'a') && (v[i] <= 'f'))