clean-up test-build and extend tomcrypt_custom.h

added LTC_MINIMAL to be able do a build without nearly any
functionality :)
make sure timing resistant RSA & ECC are enabled if not said otherwise

src/headers/tomcrypt_custom.h

@@ -125,6 +125,19 @@
    #define LTC_BASE64
 #endif
 
+/* The minimal set of functionality to run the tests */
+#ifdef LTC_MINIMAL
+   #define LTC_SHA256
+   #define LTC_CTR_MODE
+   #define LTC_RNG_MAKE_PRNG
+   #define LTC_RNG_GET_BYTES
+   #define LTC_YARROW
+   #define LTC_DEVRANDOM
+   #define LTC_TRY_URANDOM_FIRST
+
+   #undef LTC_NO_FILE
+#endif
+
 /* Enable self-test test vector checking */
 #ifndef LTC_NO_TEST
    #define LTC_TEST
@@ -252,6 +265,7 @@
 
 #endif /* LTC_NO_HASHES */
 
+
 /* ---> MAC functions <--- */
 #ifndef LTC_NO_MACS
 
@@ -283,6 +297,7 @@
 
 #endif /* LTC_NO_MACS */
 
+
 /* --> Pseudo Random Number Generators <--- */
 #ifndef LTC_NO_PRNGS
 
@@ -304,17 +319,14 @@
 
 /* Fortuna PRNG */
 #define LTC_FORTUNA
-/* reseed every N calls to the read function */
-#define LTC_FORTUNA_WD    10
-/* number of pools (4..32) can save a bit of ram by lowering the count */
-#define LTC_FORTUNA_POOLS 32
 
 /* Greg's LTC_SOBER128 PRNG ;-0 */
 #define LTC_SOBER128
 
 /* the *nix style /dev/random device */
 #define LTC_DEVRANDOM
-/* try /dev/urandom before trying /dev/random */
+/* try /dev/urandom before trying /dev/random
+ * are you sure you want to disable this? http://www.2uo.de/myths-about-urandom/ */
 #define LTC_TRY_URANDOM_FIRST
 /* rng_get_bytes() */
 #define LTC_RNG_GET_BYTES
@@ -323,17 +335,27 @@
 
 #endif /* LTC_NO_PRNGS */
 
+#ifdef LTC_FORTUNA
+
+#ifndef LTC_FORTUNA_WD
+/* reseed every N calls to the read function */
+#define LTC_FORTUNA_WD    10
+#endif
+
+#ifndef LTC_FORTUNA_POOLS
+/* number of pools (4..32) can save a bit of ram by lowering the count */
+#define LTC_FORTUNA_POOLS 32
+#endif
+
+#endif /* LTC_FORTUNA */
+
+
 /* ---> Public Key Crypto <--- */
 #ifndef LTC_NO_PK
 
 /* Include RSA support */
 #define LTC_MRSA
 
-#ifndef LTC_NO_RSA_BLINDING
-/* Enable RSA blinding when doing private key operations by default */
-#define LTC_RSA_BLINDING
-#endif  /* LTC_NO_RSA_BLINDING */
-
 /* Include Diffie-Hellman support */
 #ifndef GMP_DESC
 /* is_prime fails for GMP */
@@ -373,13 +395,18 @@
 /* do we want fixed point ECC */
 /* #define LTC_MECC_FP */
 
-#ifndef LTC_NO_ECC_TIMING_RESISTANT
+#endif /* LTC_NO_PK */
+
+#if defined(LTC_MRSA) && !defined(LTC_NO_RSA_BLINDING)
+/* Enable RSA blinding when doing private key operations by default */
+#define LTC_RSA_BLINDING
+#endif  /* LTC_NO_RSA_BLINDING */
+
+#if defined(LTC_MECC) && !defined(LTC_NO_ECC_TIMING_RESISTANT)
 /* Enable ECC timing resistant version by default */
 #define LTC_ECC_TIMING_RESISTANT
 #endif
 
-#endif /* LTC_NO_PK */
-
 /* define these PK sizes out of LTC_NO_PK
  * to have them always defined
  */