Import code from previous AssetBuilder version

thirdparty/libtomcrypt/encauth/eax/eax_addheader.c

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+/* 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_addheader.c
+    EAX implementation, add meta-data, by Tom St Denis
+*/
+#include "tomcrypt.h"
+
+#ifdef LTC_EAX_MODE
+
+/**
+    add header (metadata) to the stream
+    @param eax    The current EAX state
+    @param header The header (meta-data) data you wish to add to the state
+    @param length The length of the header data
+    @return CRYPT_OK if successful
+*/
+int eax_addheader(eax_state *eax, const unsigned char *header,
+                  unsigned long length)
+{
+   LTC_ARGCHK(eax    != NULL);
+   LTC_ARGCHK(header != NULL);
+   return omac_process(&eax->headeromac, header, length);
+}
+
+#endif
+
+/* ref:         HEAD -> master, tag: v1.18.2 */
+/* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
+/* commit time: 2018-07-01 22:49:01 +0200 */