Import code from previous AssetBuilder version

thirdparty/libtomcrypt/mac/pmac/pmac_shift_xor.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.
+ */
+#include "tomcrypt.h"
+
+/**
+   @file pmac_shift_xor.c
+   PMAC implementation, internal function, by Tom St Denis
+*/
+
+#ifdef LTC_PMAC
+
+/**
+  Internal function.  Performs the state update (adding correct multiple)
+  @param pmac   The PMAC state.
+*/
+void pmac_shift_xor(pmac_state *pmac)
+{
+   int x, y;
+   y = pmac_ntz(pmac->block_index++);
+#ifdef LTC_FAST
+   for (x = 0; x < pmac->block_len; x += sizeof(LTC_FAST_TYPE)) {
+       *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)pmac->Li + x)) ^=
+       *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)pmac->Ls[y] + x));
+   }
+#else
+   for (x = 0; x < pmac->block_len; x++) {
+       pmac->Li[x] ^= pmac->Ls[y][x];
+   }
+#endif
+}
+
+#endif
+
+/* ref:         HEAD -> master, tag: v1.18.2 */
+/* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
+/* commit time: 2018-07-01 22:49:01 +0200 */