Replaced system SQLite with SQLCipher to support encrypted database

Sources/DataLiteC/libtomcrypt/pk/x25519/x25519_make_key.c

@@ -0,0 +1,42 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+#include "tomcrypt_private.h"
+
+/**
+  @file x25519_make_key.c
+  Create a X25519 key, Steffen Jaeckel
+*/
+
+#ifdef LTC_CURVE25519
+
+/**
+   Create a X25519 key
+   @param prng     An active PRNG state
+   @param wprng    The index of the PRNG desired
+   @param key      [out] Destination of a newly created private key pair
+   @return CRYPT_OK if successful
+*/
+int x25519_make_key(prng_state *prng, int wprng, curve25519_key *key)
+{
+   int err;
+
+   LTC_ARGCHK(prng != NULL);
+   LTC_ARGCHK(key  != NULL);
+
+   if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
+      return err;
+   }
+
+   if (prng_descriptor[wprng].read(key->priv, sizeof(key->priv), prng) != sizeof(key->priv)) {
+      return CRYPT_ERROR_READPRNG;
+   }
+
+   tweetnacl_crypto_scalarmult_base(key->pub, key->priv);
+
+   key->type = PK_PRIVATE;
+   key->pka = LTC_PKA_X25519;
+
+   return err;
+}
+
+#endif