Replaced system SQLite with SQLCipher to support encrypted database

Sources/DataLiteC/libtomcrypt/modes/ofb/ofb_start.c

@@ -0,0 +1,48 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+#include "tomcrypt_private.h"
+
+/**
+   @file ofb_start.c
+   OFB implementation, start chain, Tom St Denis
+*/
+
+
+#ifdef LTC_OFB_MODE
+
+/**
+   Initialize a OFB context
+   @param cipher      The index of the cipher desired
+   @param IV          The initialization vector
+   @param key         The secret key
+   @param keylen      The length of the secret key (octets)
+   @param num_rounds  Number of rounds in the cipher desired (0 for default)
+   @param ofb         The OFB state to initialize
+   @return CRYPT_OK if successful
+*/
+int ofb_start(int cipher, const unsigned char *IV, const unsigned char *key,
+              int keylen, int num_rounds, symmetric_OFB *ofb)
+{
+   int x, err;
+
+   LTC_ARGCHK(IV != NULL);
+   LTC_ARGCHK(key != NULL);
+   LTC_ARGCHK(ofb != NULL);
+
+   if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
+      return err;
+   }
+
+   /* copy details */
+   ofb->cipher = cipher;
+   ofb->blocklen = cipher_descriptor[cipher].block_length;
+   for (x = 0; x < ofb->blocklen; x++) {
+       ofb->IV[x] = IV[x];
+   }
+
+   /* init the cipher */
+   ofb->padlen = ofb->blocklen;
+   return cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ofb->key);
+}
+
+#endif