Replaced system SQLite with SQLCipher to support encrypted database

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

@@ -0,0 +1,53 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+#include "tomcrypt_private.h"
+
+#ifdef LTC_MECC
+
+/** Export raw public or private key (public keys = ANS X9.63 compressed or uncompressed; private keys = raw bytes)
+  @param out    [out] destination of export
+  @param outlen [in/out]  Length of destination and final output size
+  @param type   PK_PRIVATE, PK_PUBLIC or PK_PUBLIC|PK_COMPRESSED
+  @param key    Key to export
+  Return        CRYPT_OK on success
+*/
+
+int ecc_get_key(unsigned char *out, unsigned long *outlen, int type, const ecc_key *key)
+{
+   unsigned long size, ksize;
+   int err, compressed;
+
+   LTC_ARGCHK(key    != NULL);
+   LTC_ARGCHK(out    != NULL);
+   LTC_ARGCHK(outlen != NULL);
+
+   size = key->dp.size;
+   compressed = type & PK_COMPRESSED ? 1 : 0;
+   type &= ~PK_COMPRESSED;
+
+   if (type == PK_PUBLIC) {
+      if ((err = ltc_ecc_export_point(out, outlen, key->pubkey.x, key->pubkey.y, size, compressed)) != CRYPT_OK) {
+         return err;
+      }
+   }
+   else if (type == PK_PRIVATE) {
+      if (key->type != PK_PRIVATE)                                                return CRYPT_PK_TYPE_MISMATCH;
+      if (size > *outlen) {
+         *outlen = size;
+         return CRYPT_BUFFER_OVERFLOW;
+      }
+      *outlen = size;
+      if ((ksize = ltc_mp_unsigned_bin_size(key->k)) > size)                          return CRYPT_BUFFER_OVERFLOW;
+      /* pad and store k */
+      if ((err = ltc_mp_to_unsigned_bin(key->k, out + (size - ksize))) != CRYPT_OK)   return err;
+      zeromem(out, size - ksize);
+   }
+   else {
+      return CRYPT_INVALID_ARG;
+   }
+
+   return CRYPT_OK;
+}
+
+#endif