Import code from previous AssetBuilder version

thirdparty/libtomcrypt/encauth/ocb3/ocb3_encrypt_authenticate_memory.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.
+ */
+
+/**
+  @file ocb3_encrypt_authenticate_memory.c
+  OCB implementation, encrypt block of memory, by Tom St Denis
+*/
+#include "tomcrypt.h"
+
+#ifdef LTC_OCB3_MODE
+
+/**
+   Encrypt and generate an authentication code for a buffer of memory
+   @param cipher     The index of the cipher desired
+   @param key        The secret key
+   @param keylen     The length of the secret key (octets)
+   @param nonce      The session nonce (length of the block ciphers block size)
+   @param noncelen   The length of the nonce (octets)
+   @param adata      The AAD - additional associated data
+   @param adatalen   The length of AAD (octets)
+   @param pt         The plaintext
+   @param ptlen      The length of the plaintext (octets)
+   @param ct         [out] The ciphertext
+   @param tag        [out] The authentication tag
+   @param taglen     [in/out] The max size and resulting size of the authentication tag
+   @return CRYPT_OK if successful
+*/
+int ocb3_encrypt_authenticate_memory(int cipher,
+    const unsigned char *key,    unsigned long keylen,
+    const unsigned char *nonce,  unsigned long noncelen,
+    const unsigned char *adata,  unsigned long adatalen,
+    const unsigned char *pt,     unsigned long ptlen,
+          unsigned char *ct,
+          unsigned char *tag,    unsigned long *taglen)
+{
+   int err;
+   ocb3_state *ocb;
+
+   LTC_ARGCHK(taglen != NULL);
+
+   /* allocate memory */
+   ocb = XMALLOC(sizeof(ocb3_state));
+   if (ocb == NULL) {
+      return CRYPT_MEM;
+   }
+
+   if ((err = ocb3_init(ocb, cipher, key, keylen, nonce, noncelen, *taglen)) != CRYPT_OK) {
+      goto LBL_ERR;
+   }
+
+   if (adata != NULL || adatalen != 0) {
+      if ((err = ocb3_add_aad(ocb, adata, adatalen)) != CRYPT_OK) {
+         goto LBL_ERR;
+      }
+   }
+
+   if ((err = ocb3_encrypt_last(ocb, pt, ptlen, ct)) != CRYPT_OK) {
+      goto LBL_ERR;
+   }
+
+   err = ocb3_done(ocb, tag, taglen);
+
+LBL_ERR:
+#ifdef LTC_CLEAN_STACK
+   zeromem(ocb, sizeof(ocb3_state));
+#endif
+
+   XFREE(ocb);
+   return err;
+}
+
+#endif
+
+/* ref:         HEAD -> master, tag: v1.18.2 */
+/* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
+/* commit time: 2018-07-01 22:49:01 +0200 */