+++ /dev/null
-/* 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: $Format:%D$ */
-/* git commit: $Format:%H$ */
-/* commit time: $Format:%ai$ */