Replaced system SQLite with SQLCipher to support encrypted database

Sources/DataLiteC/libtomcrypt/pk/ecc/ecc_make_key.c

@@ -0,0 +1,73 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+#include "tomcrypt_private.h"
+
+/**
+  @file ecc_make_key.c
+  ECC Crypto, Tom St Denis
+*/
+
+#ifdef LTC_MECC
+
+/**
+  Make a new ECC key
+  @param prng         An active PRNG state
+  @param wprng        The index of the PRNG you wish to use
+  @param keysize      The keysize for the new key (in octets from 20 to 65 bytes)
+  @param key          [out] Destination of the newly created key
+  @return CRYPT_OK if successful, upon error all allocated memory will be freed
+*/
+int ecc_make_key(prng_state *prng, int wprng, int keysize, ecc_key *key)
+{
+   int err;
+
+   if ((err = ecc_set_curve_by_size(keysize, key)) != CRYPT_OK) { return err; }
+   if ((err = ecc_generate_key(prng, wprng, key)) != CRYPT_OK)  { return err; }
+   return CRYPT_OK;
+}
+
+int ecc_make_key_ex(prng_state *prng, int wprng, ecc_key *key, const ltc_ecc_curve *cu)
+{
+   int err;
+   if ((err = ecc_set_curve(cu, key)) != CRYPT_OK)             { return err; }
+   if ((err = ecc_generate_key(prng, wprng, key)) != CRYPT_OK) { return err; }
+   return CRYPT_OK;
+}
+
+int ecc_generate_key(prng_state *prng, int wprng, ecc_key *key)
+{
+   int            err;
+
+   LTC_ARGCHK(ltc_mp.name != NULL);
+   LTC_ARGCHK(key         != NULL);
+   LTC_ARGCHK(key->dp.size > 0);
+
+   /* ECC key pair generation according to FIPS-186-4 (B.4.2 Key Pair Generation by Testing Candidates):
+    * the generated private key k should be the range [1, order-1]
+    *  a/ N = bitlen(order)
+    *  b/ generate N random bits and convert them into big integer k
+    *  c/ if k not in [1, order-1] go to b/
+    *  e/ Q = k*G
+    */
+   if ((err = rand_bn_upto(key->k, key->dp.order, prng, wprng)) != CRYPT_OK) {
+      goto error;
+   }
+
+   /* make the public key */
+   if ((err = ltc_mp.ecc_ptmul(key->k, &key->dp.base, &key->pubkey, key->dp.A, key->dp.prime, 1)) != CRYPT_OK) {
+      goto error;
+   }
+   key->type = PK_PRIVATE;
+
+   /* success */
+   err = CRYPT_OK;
+   goto cleanup;
+
+error:
+   ecc_free(key);
+cleanup:
+   return err;
+}
+
+#endif