Import code from previous AssetBuilder version

2025-07-03 01:31:54 +00:00 · 2019-09-24 10:45:09 +02:00
parent 5609557516
commit 0d8432d4f7
919 changed files with 154412 additions and 26 deletions
--- a/thirdparty/libtomcrypt/encauth/eax/eax_done.c
+++ b/thirdparty/libtomcrypt/encauth/eax/eax_done.c
@ -0,0 +1,92 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ */
+
+/**
+   @file eax_done.c
+   EAX implementation, terminate session, by Tom St Denis
+*/
+#include "tomcrypt.h"
+
+#ifdef LTC_EAX_MODE
+
+/**
+   Terminate an EAX session and get the tag.
+   @param eax       The EAX state
+   @param tag       [out] The destination of the authentication tag
+   @param taglen    [in/out] The max length and resulting length of the authentication tag
+   @return CRYPT_OK if successful
+*/
+int eax_done(eax_state *eax, unsigned char *tag, unsigned long *taglen)
+{
+   int           err;
+   unsigned char *headermac, *ctmac;
+   unsigned long x, len;
+
+   LTC_ARGCHK(eax    != NULL);
+   LTC_ARGCHK(tag    != NULL);
+   LTC_ARGCHK(taglen != NULL);
+
+   /* allocate ram */
+   headermac = XMALLOC(MAXBLOCKSIZE);
+   ctmac     = XMALLOC(MAXBLOCKSIZE);
+
+   if (headermac == NULL || ctmac == NULL) {
+      if (headermac != NULL) {
+         XFREE(headermac);
+      }
+      if (ctmac != NULL) {
+         XFREE(ctmac);
+      }
+      return CRYPT_MEM;
+   }
+
+   /* finish ctomac */
+   len = MAXBLOCKSIZE;
+   if ((err = omac_done(&eax->ctomac, ctmac, &len)) != CRYPT_OK) {
+      goto LBL_ERR;
+   }
+
+   /* finish headeromac */
+
+   /* note we specifically don't reset len so the two lens are minimal */
+
+   if ((err = omac_done(&eax->headeromac, headermac, &len)) != CRYPT_OK) {
+      goto LBL_ERR;
+   }
+
+   /* terminate the CTR chain */
+   if ((err = ctr_done(&eax->ctr)) != CRYPT_OK) {
+      goto LBL_ERR;
+   }
+
+   /* compute N xor H xor C */
+   for (x = 0; x < len && x < *taglen; x++) {
+       tag[x] = eax->N[x] ^ headermac[x] ^ ctmac[x];
+   }
+   *taglen = x;
+
+   err = CRYPT_OK;
+LBL_ERR:
+#ifdef LTC_CLEAN_STACK
+   zeromem(ctmac,     MAXBLOCKSIZE);
+   zeromem(headermac, MAXBLOCKSIZE);
+   zeromem(eax,       sizeof(*eax));
+#endif
+
+   XFREE(ctmac);
+   XFREE(headermac);
+
+   return err;
+}
+
+#endif
+
+/* ref:         HEAD -> master, tag: v1.18.2 */
+/* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
+/* commit time: 2018-07-01 22:49:01 +0200 */