disable ltc_rng by default

src/headers/tomcrypt_custom.h

@@ -304,6 +304,9 @@
 /* rng_make_prng() */
 #define LTC_RNG_MAKE_PRNG
 
+/* enable the ltc_rng hook to integrate e.g. embedded hardware RNG's easily */
+/* #define LTC_PRNG_ENABLE_LTC_RNG */
+
 #endif /* LTC_NO_PRNGS */
 
 #ifdef LTC_YARROW

src/headers/tomcrypt_prng.h

@@ -193,8 +193,10 @@ unsigned long rng_get_bytes(unsigned char *out,
 
 int rng_make_prng(int bits, int wprng, prng_state *prng, void (*callback)(void));
 
+#ifdef LTC_PRNG_ENABLE_LTC_RNG
 extern unsigned long (*ltc_rng)(unsigned char *out, unsigned long outlen,
       void (*callback)(void));
+#endif
 
 
 /* $Source$ */