Replaced system SQLite with SQLCipher to support encrypted database

Sources/DataLiteC/libtomcrypt/misc/crypt/crypt_prng_is_valid.c

@@ -0,0 +1,24 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+#include "tomcrypt_private.h"
+
+/**
+  @file crypt_prng_is_valid.c
+  Determine if PRNG is valid, Tom St Denis
+*/
+
+/*
+   Test if a PRNG index is valid
+   @param idx   The index of the PRNG to search for
+   @return CRYPT_OK if valid
+*/
+int prng_is_valid(int idx)
+{
+   LTC_MUTEX_LOCK(&ltc_prng_mutex);
+   if (idx < 0 || idx >= TAB_SIZE || prng_descriptor[idx].name == NULL) {
+      LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
+      return CRYPT_INVALID_PRNG;
+   }
+   LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
+   return CRYPT_OK;
+}