Import code from previous AssetBuilder version

thirdparty/libtomcrypt/modes/ctr/ctr_setiv.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_setiv.c
+  CTR implementation, set IV, Tom St Denis
+*/
+
+#ifdef LTC_CTR_MODE
+
+/**
+   Set an initialization vector
+   @param IV   The initialization vector
+   @param len  The length of the vector (in octets)
+   @param ctr  The CTR state
+   @return CRYPT_OK if successful
+*/
+int ctr_setiv(const unsigned char *IV, unsigned long len, symmetric_CTR *ctr)
+{
+   int err;
+
+   LTC_ARGCHK(IV  != NULL);
+   LTC_ARGCHK(ctr != NULL);
+
+   /* bad param? */
+   if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
+      return err;
+   }
+
+   if (len != (unsigned long)ctr->blocklen) {
+      return CRYPT_INVALID_ARG;
+   }
+
+   /* set IV */
+   XMEMCPY(ctr->ctr, IV, len);
+
+   /* force next block */
+   ctr->padlen = 0;
+   return cipher_descriptor[ctr->cipher].ecb_encrypt(IV, ctr->pad, &ctr->key);
+}
+
+#endif
+
+
+/* ref:         HEAD -> master, tag: v1.18.2 */
+/* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
+/* commit time: 2018-07-01 22:49:01 +0200 */