Import code from previous AssetBuilder version

thirdparty/libtomcrypt/modes/ctr/ctr_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 ctr_decrypt.c
+  CTR implementation, decrypt data, Tom St Denis
+*/
+
+#ifdef LTC_CTR_MODE
+
+/**
+   CTR decrypt
+   @param ct      Ciphertext
+   @param pt      [out] Plaintext
+   @param len     Length of ciphertext (octets)
+   @param ctr     CTR state
+   @return CRYPT_OK if successful
+*/
+int ctr_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CTR *ctr)
+{
+   LTC_ARGCHK(pt != NULL);
+   LTC_ARGCHK(ct != NULL);
+   LTC_ARGCHK(ctr != NULL);
+
+   return ctr_encrypt(ct, pt, len, ctr);
+}
+
+#endif
+
+
+/* ref:         HEAD -> master, tag: v1.18.2 */
+/* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
+/* commit time: 2018-07-01 22:49:01 +0200 */