Replaced system SQLite with SQLCipher to support encrypted database

Sources/DataLiteC/libtomcrypt/math/rand_bn.c

@@ -0,0 +1,65 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+#include "tomcrypt_private.h"
+
+#if defined(LTC_MDSA) || defined(LTC_MECC)
+/**
+  Generate a random number N with given bitlength (note: MSB can be 0)
+*/
+
+int rand_bn_bits(void *N, int bits, prng_state *prng, int wprng)
+{
+   int res, bytes;
+   unsigned char *buf, mask;
+
+   LTC_ARGCHK(N != NULL);
+   LTC_ARGCHK(bits > 1);
+
+   /* check PRNG */
+   if ((res = prng_is_valid(wprng)) != CRYPT_OK) return res;
+
+   bytes = (bits+7) >> 3;
+   mask = 0xff >> (bits % 8 == 0 ? 0 : 8 - bits % 8);
+
+   /* allocate buffer */
+   if ((buf = XCALLOC(1, bytes)) == NULL) return CRYPT_MEM;
+
+   /* generate random bytes */
+   if (prng_descriptor[wprng].read(buf, bytes, prng) != (unsigned long)bytes) {
+      res = CRYPT_ERROR_READPRNG;
+      goto cleanup;
+   }
+   /* mask bits */
+   buf[0] &= mask;
+   /* load value */
+   if ((res = ltc_mp_read_unsigned_bin(N, buf, bytes)) != CRYPT_OK) goto cleanup;
+
+   res = CRYPT_OK;
+
+cleanup:
+#ifdef LTC_CLEAN_STACK
+   zeromem(buf, bytes);
+#endif
+   XFREE(buf);
+   return res;
+}
+
+/**
+  Generate a random number N in a range: 1 <= N < limit
+*/
+int rand_bn_upto(void *N, void *limit, prng_state *prng, int wprng)
+{
+   int res, bits;
+
+   LTC_ARGCHK(N != NULL);
+   LTC_ARGCHK(limit != NULL);
+
+   bits = ltc_mp_count_bits(limit);
+   do {
+     res = rand_bn_bits(N, bits, prng, wprng);
+     if (res != CRYPT_OK) return res;
+   } while (ltc_mp_cmp_d(N, 0) != LTC_MP_GT || ltc_mp_cmp(N, limit) != LTC_MP_LT);
+
+   return CRYPT_OK;
+}
+#endif