X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=libtomcrypt%2Fsrc%2Fencauth%2Feax%2Feax_done.c;fp=libtomcrypt%2Fsrc%2Fencauth%2Feax%2Feax_done.c;h=b00bfe08441c450c198b03e03ef2ede9c149f9bd;hb=66bc25938679f1d6a1d1200f329093d82a5e99b4;hp=0000000000000000000000000000000000000000;hpb=a52ee0733f420ca20224049260d6fc5cf7d8f621;p=zpackage

diff --git a/libtomcrypt/src/encauth/eax/eax_done.c b/libtomcrypt/src/encauth/eax/eax_done.c
new file mode 100644
index 0000000..b00bfe0
--- /dev/null
+++ b/libtomcrypt/src/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:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */