Import code from previous AssetBuilder version

thirdparty/libtomcrypt/mac/xcbc/xcbc_process.c

@@ -0,0 +1,73 @@
+/* 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 xcbc_process.c
+  XCBC Support, process blocks with XCBC
+*/
+
+#ifdef LTC_XCBC
+
+/** Process data through XCBC-MAC
+  @param xcbc     The XCBC-MAC state
+  @param in       Input data to process
+  @param inlen    Length of input in octets
+  Return CRYPT_OK on success
+*/
+int xcbc_process(xcbc_state *xcbc, const unsigned char *in, unsigned long inlen)
+{
+   int err;
+#ifdef LTC_FAST
+   int x;
+#endif
+
+   LTC_ARGCHK(xcbc != NULL);
+   LTC_ARGCHK(in   != NULL);
+
+   /* check structure */
+   if ((err = cipher_is_valid(xcbc->cipher)) != CRYPT_OK) {
+      return err;
+   }
+
+   if ((xcbc->blocksize > cipher_descriptor[xcbc->cipher].block_length) || (xcbc->blocksize < 0) ||
+       (xcbc->buflen > xcbc->blocksize) || (xcbc->buflen < 0)) {
+      return CRYPT_INVALID_ARG;
+   }
+
+#ifdef LTC_FAST
+   if (xcbc->buflen == 0) {
+       while (inlen > (unsigned long)xcbc->blocksize) {
+           for (x = 0; x < xcbc->blocksize; x += sizeof(LTC_FAST_TYPE)) {
+              *(LTC_FAST_TYPE_PTR_CAST(&(xcbc->IV[x]))) ^= *(LTC_FAST_TYPE_PTR_CAST(&(in[x])));
+           }
+           cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key);
+           in    += xcbc->blocksize;
+           inlen -= xcbc->blocksize;
+       }
+   }
+#endif
+
+   while (inlen) {
+      if (xcbc->buflen == xcbc->blocksize) {
+         cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key);
+         xcbc->buflen = 0;
+      }
+      xcbc->IV[xcbc->buflen++] ^= *in++;
+      --inlen;
+   }
+   return CRYPT_OK;
+}
+
+#endif
+
+/* ref:         HEAD -> master, tag: v1.18.2 */
+/* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
+/* commit time: 2018-07-01 22:49:01 +0200 */
+