Import code from previous AssetBuilder version

thirdparty/libtomcrypt/modes/lrw/lrw_decrypt.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 lrw_decrypt.c
+   LRW_MODE implementation, Decrypt blocks, Tom St Denis
+*/
+
+#ifdef LTC_LRW_MODE
+
+/**
+  LRW decrypt blocks
+  @param ct     The ciphertext
+  @param pt     [out] The plaintext
+  @param len    The length in octets, must be a multiple of 16
+  @param lrw    The LRW state
+*/
+int lrw_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_LRW *lrw)
+{
+   int err;
+
+   LTC_ARGCHK(pt  != NULL);
+   LTC_ARGCHK(ct  != NULL);
+   LTC_ARGCHK(lrw != NULL);
+
+   if ((err = cipher_is_valid(lrw->cipher)) != CRYPT_OK) {
+      return err;
+   }
+
+   if (cipher_descriptor[lrw->cipher].accel_lrw_decrypt != NULL) {
+      return cipher_descriptor[lrw->cipher].accel_lrw_decrypt(ct, pt, len, lrw->IV, lrw->tweak, &lrw->key);
+   }
+
+   return lrw_process(ct, pt, len, LRW_DECRYPT, lrw);
+}
+
+
+#endif
+
+/* ref:         HEAD -> master, tag: v1.18.2 */
+/* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
+/* commit time: 2018-07-01 22:49:01 +0200 */