Replaced system SQLite with SQLCipher to support encrypted database

Sources/DataLiteC/libtomcrypt/stream/chacha/chacha_memory.c

@@ -0,0 +1,57 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+#include "tomcrypt_private.h"
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wconversion"
+#pragma clang diagnostic ignored "-Wshorten-64-to-32"
+
+#ifdef LTC_CHACHA
+
+/**
+   Encrypt (or decrypt) bytes of ciphertext (or plaintext) with ChaCha
+   @param key     The key
+   @param keylen  The key length
+   @param rounds  The number of rounds
+   @param iv      The initial vector
+   @param ivlen   The initial vector length
+   @param counter initial counter value, either ignored, 32- or 64-bit, depending on ivlen
+   @param datain  The plaintext (or ciphertext)
+   @param datalen The length of the input and output (octets)
+   @param dataout [out] The ciphertext (or plaintext)
+   @return CRYPT_OK if successful
+*/
+int chacha_memory(const unsigned char *key,    unsigned long keylen,  unsigned long rounds,
+                  const unsigned char *iv,     unsigned long ivlen,   ulong64 counter,
+                  const unsigned char *datain, unsigned long datalen, unsigned char *dataout)
+{
+   chacha_state st;
+   int err;
+   const unsigned char *iv_ = iv;
+   unsigned long ivlen_ = ivlen;
+   ulong64 counter_ = counter;
+
+   if (ivlen == 16) {
+      LOAD64L(counter_, iv);
+      iv_ += 8;
+      ivlen_ -=8;
+   }
+
+   LTC_ARGCHK(ivlen_ <= 8 || counter_ < CONST64(4294967296));       /* 2**32 */
+
+   if ((err = chacha_setup(&st, key, keylen, rounds))       != CRYPT_OK) goto WIPE_KEY;
+   if (ivlen_ > 8) {
+        if ((err = chacha_ivctr32(&st, iv_, ivlen_, (ulong32)counter_)) != CRYPT_OK) goto WIPE_KEY;
+   } else {
+        if ((err = chacha_ivctr64(&st, iv_, ivlen_, counter_)) != CRYPT_OK) goto WIPE_KEY;
+   }
+   err = chacha_crypt(&st, datain, datalen, dataout);
+WIPE_KEY:
+   chacha_done(&st);
+   return err;
+}
+
+#endif /* LTC_CHACHA */
+
+#pragma clang diagnostic pop