Strip leading zero bytes from public key values.

src/sbbs3/js_cryptcon.c

@@ -134,6 +134,10 @@ static void js_simple_asn1(unsigned char *data, size_t len, JSContext *cx, JSObj
 						n = malloc(sz);
 						if (n == NULL)
 							return;
+						while(data[off] == 0) {
+							off++;
+							sz--;
+						}
 						memcpy(n, data+off, sz);
 						n64 = malloc(sz*4/3+3);
 						if (n64 == NULL) {
@@ -161,6 +165,10 @@ static void js_simple_asn1(unsigned char *data, size_t len, JSContext *cx, JSObj
 							free(n64);
 							return;
 						}
+						while(data[off] == 0) {
+							off++;
+							sz--;
+						}
 						memcpy(e, data+off, sz);
 						e64 = malloc(sz*4/3+3);
 						if (e64 == NULL) {