Replaced system SQLite with SQLCipher to support encrypted database

Sources/DataLiteC/libtomcrypt/modes/cbc/cbc_encrypt.c

@@ -0,0 +1,85 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+#include "tomcrypt_private.h"
+
+/**
+   @file cbc_encrypt.c
+   CBC implementation, encrypt block, Tom St Denis
+*/
+
+
+#ifdef LTC_CBC_MODE
+
+/**
+  CBC encrypt
+  @param pt     Plaintext
+  @param ct     [out] Ciphertext
+  @param len    The number of bytes to process (must be multiple of block length)
+  @param cbc    CBC state
+  @return CRYPT_OK if successful
+*/
+int cbc_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CBC *cbc)
+{
+   int x, err;
+
+   LTC_ARGCHK(pt != NULL);
+   LTC_ARGCHK(ct != NULL);
+   LTC_ARGCHK(cbc != NULL);
+
+   if ((err = cipher_is_valid(cbc->cipher)) != CRYPT_OK) {
+       return err;
+   }
+
+   /* is blocklen valid? */
+   if (cbc->blocklen < 1 || cbc->blocklen > (int)sizeof(cbc->IV)) {
+      return CRYPT_INVALID_ARG;
+   }
+
+   if (len % cbc->blocklen) {
+      return CRYPT_INVALID_ARG;
+   }
+#ifdef LTC_FAST
+   if (cbc->blocklen % sizeof(LTC_FAST_TYPE)) {
+      return CRYPT_INVALID_ARG;
+   }
+#endif
+
+   if (cipher_descriptor[cbc->cipher].accel_cbc_encrypt != NULL) {
+      return cipher_descriptor[cbc->cipher].accel_cbc_encrypt(pt, ct, len / cbc->blocklen, cbc->IV, &cbc->key);
+   }
+   while (len) {
+      /* xor IV against plaintext */
+#if defined(LTC_FAST)
+      for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) {
+         *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)cbc->IV + x)) ^= *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)pt + x));
+      }
+#else
+      for (x = 0; x < cbc->blocklen; x++) {
+         cbc->IV[x] ^= pt[x];
+      }
+#endif
+
+      /* encrypt */
+      if ((err = cipher_descriptor[cbc->cipher].ecb_encrypt(cbc->IV, ct, &cbc->key)) != CRYPT_OK) {
+         return err;
+      }
+
+      /* store IV [ciphertext] for a future block */
+#if defined(LTC_FAST)
+      for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) {
+         *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)cbc->IV + x)) = *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)ct + x));
+      }
+#else
+      for (x = 0; x < cbc->blocklen; x++) {
+         cbc->IV[x] = ct[x];
+      }
+#endif
+
+      ct  += cbc->blocklen;
+      pt  += cbc->blocklen;
+      len -= cbc->blocklen;
+   }
+   return CRYPT_OK;
+}
+
+#endif