Replaced system SQLite with SQLCipher to support encrypted database

2025-06-07 18:11:17 +03:00
parent f4198d62a7
commit 177d74700f
534 changed files with 362771 additions and 21 deletions
--- a/Sources/DataLiteC/libtomcrypt/encauth/ocb3/ocb3_decrypt.c
+++ b/Sources/DataLiteC/libtomcrypt/encauth/ocb3/ocb3_decrypt.c
@@ -0,0 +1,82 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+/**
+   @file ocb3_decrypt.c
+   OCB implementation, decrypt data, by Tom St Denis
+*/
+#include "tomcrypt_private.h"
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wconversion"
+#pragma clang diagnostic ignored "-Wshorten-64-to-32"
+
+#ifdef LTC_OCB3_MODE
+
+/**
+   Decrypt blocks of ciphertext with OCB
+   @param ocb     The OCB state
+   @param ct      The ciphertext (length multiple of the block size of the block cipher)
+   @param ctlen   The length of the input (octets)
+   @param pt      [out] The plaintext (length of ct)
+   @return CRYPT_OK if successful
+*/
+int ocb3_decrypt(ocb3_state *ocb, const unsigned char *ct, unsigned long ctlen, unsigned char *pt)
+{
+   unsigned char tmp[MAXBLOCKSIZE];
+   int err, i, full_blocks;
+   unsigned char *pt_b, *ct_b;
+
+   LTC_ARGCHK(ocb != NULL);
+   if (ctlen == 0) return CRYPT_OK; /* no data, nothing to do */
+   LTC_ARGCHK(ct != NULL);
+   LTC_ARGCHK(pt != NULL);
+
+   if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) {
+      return err;
+   }
+   if (ocb->block_len != cipher_descriptor[ocb->cipher].block_length) {
+      return CRYPT_INVALID_ARG;
+   }
+
+   if (ctlen % ocb->block_len) { /* ctlen has to bu multiple of block_len */
+      return CRYPT_INVALID_ARG;
+   }
+
+   full_blocks = ctlen/ocb->block_len;
+   for(i=0; i<full_blocks; i++) {
+     pt_b = (unsigned char *)pt+i*ocb->block_len;
+     ct_b = (unsigned char *)ct+i*ocb->block_len;
+
+     /* ocb->Offset_current[] = ocb->Offset_current[] ^ Offset_{ntz(block_index)} */
+     ocb3_int_xor_blocks(ocb->Offset_current, ocb->Offset_current, ocb->L_[ocb3_int_ntz(ocb->block_index)], ocb->block_len);
+
+     /* tmp[] = ct[] XOR ocb->Offset_current[] */
+     ocb3_int_xor_blocks(tmp, ct_b, ocb->Offset_current, ocb->block_len);
+
+     /* decrypt */
+     if ((err = cipher_descriptor[ocb->cipher].ecb_decrypt(tmp, tmp, &ocb->key)) != CRYPT_OK) {
+        goto LBL_ERR;
+     }
+
+     /* pt[] = tmp[] XOR ocb->Offset_current[] */
+     ocb3_int_xor_blocks(pt_b, tmp, ocb->Offset_current, ocb->block_len);
+
+     /* ocb->checksum[] = ocb->checksum[] XOR pt[] */
+     ocb3_int_xor_blocks(ocb->checksum, ocb->checksum, pt_b, ocb->block_len);
+
+     ocb->block_index++;
+   }
+
+   err = CRYPT_OK;
+
+LBL_ERR:
+#ifdef LTC_CLEAN_STACK
+   zeromem(tmp, sizeof(tmp));
+#endif
+   return err;
+}
+
+#endif
+
+#pragma clang diagnostic pop