check in some experimental X.509 parsing code

tls_cipherprio.c

@@ -0,0 +1,13 @@
+#include <tinytls.h>
+
+static uint16_t ciphers[] = {
+  TLS_RSA_WITH_AES_256_CBC_SHA256,
+  TLS_RSA_WITH_AES_256_CBC_SHA,
+};
+
+int tls_cipherprio(uint16_t cipher) {
+  size_t i;
+  for (i=0; i<sizeof(ciphers)/sizeof(ciphers[0]); ++i)
+    if (ciphers[i]==cipher) return i;
+  return -1;
+}