Import code from previous AssetBuilder version

thirdparty/libtomcrypt/modes/cfb/cfb_start.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 cfb_start.c
+   CFB implementation, start chain, Tom St Denis
+*/
+
+
+#ifdef LTC_CFB_MODE
+
+/**
+   Initialize a CFB context
+   @param cipher      The index of the cipher desired
+   @param IV          The initialization vector
+   @param key         The secret key
+   @param keylen      The length of the secret key (octets)
+   @param num_rounds  Number of rounds in the cipher desired (0 for default)
+   @param cfb         The CFB state to initialize
+   @return CRYPT_OK if successful
+*/
+int cfb_start(int cipher, const unsigned char *IV, const unsigned char *key,
+              int keylen, int num_rounds, symmetric_CFB *cfb)
+{
+   int x, err;
+
+   LTC_ARGCHK(IV != NULL);
+   LTC_ARGCHK(key != NULL);
+   LTC_ARGCHK(cfb != NULL);
+
+   if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
+      return err;
+   }
+
+
+   /* copy data */
+   cfb->cipher = cipher;
+   cfb->blocklen = cipher_descriptor[cipher].block_length;
+   for (x = 0; x < cfb->blocklen; x++)
+       cfb->IV[x] = IV[x];
+
+   /* init the cipher */
+   if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &cfb->key)) != CRYPT_OK) {
+      return err;
+   }
+
+   /* encrypt the IV */
+   cfb->padlen = 0;
+   return cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->IV, cfb->IV, &cfb->key);
+}
+
+#endif
+
+/* ref:         HEAD -> master, tag: v1.18.2 */
+/* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
+/* commit time: 2018-07-01 22:49:01 +0200 */