Replaced system SQLite with SQLCipher to support encrypted database

Sources/DataLiteC/libtomcrypt/modes/cfb/cfb_start.c

@@ -0,0 +1,90 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+#include "tomcrypt_private.h"
+
+/**
+   @file cfb_start.c
+   CFB implementation, start chain, Tom St Denis
+*/
+
+
+#ifdef LTC_CFB_MODE
+
+
+/**
+   Extended initialization of a CFB 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 width       The width of the mode in bits (0 for default)
+   @param cfb         The CFB state to initialize
+   @return CRYPT_OK if successful
+*/
+int cfb_start_ex(int cipher, const unsigned char *IV, const unsigned char *key,
+                 int keylen, int num_rounds, int width, symmetric_CFB *cfb)
+{
+   int x, err;
+
+   LTC_ARGCHK(IV != NULL);
+   LTC_ARGCHK(key != NULL);
+   LTC_ARGCHK(cfb != NULL);
+
+   if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
+      return err;
+   }
+
+   switch (width) {
+      case 0:
+         width = cipher_descriptor[cipher].block_length * 8;
+         break;
+      case 1:
+      case 8:
+         LTC_ARGCHK(cipher_descriptor[cipher].block_length == 8
+                    || cipher_descriptor[cipher].block_length == 16);
+         break;
+      case 64:
+      case 128:
+         LTC_ARGCHK(width == cipher_descriptor[cipher].block_length * 8);
+         break;
+      default:
+         return CRYPT_INVALID_ARG;
+   }
+
+
+   /* copy data */
+   cfb->cipher = cipher;
+   cfb->width = width;
+   cfb->blocklen = cipher_descriptor[cipher].block_length;
+   for (x = 0; x < cfb->blocklen; x++) {
+       cfb->pad[x] = IV[x];
+   }
+
+   /* init the cipher */
+   if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &cfb->key)) != CRYPT_OK) {
+      return err;
+   }
+
+   /* encrypt the IV */
+   cfb->padlen = 0;
+   return cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->pad, cfb->IV, &cfb->key);
+}
+
+/**
+   Initialize a CFB 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 cfb         The CFB state to initialize
+   @return CRYPT_OK if successful
+*/
+int cfb_start(int cipher, const unsigned char *IV, const unsigned char *key,
+              int keylen, int num_rounds, symmetric_CFB *cfb)
+{
+   return cfb_start_ex(cipher, IV, key, keylen, num_rounds, 0, cfb);
+}
+
+#endif