added libtomcrypt-1.00

src/misc/crypt/crypt_register_hash.c

@@ -0,0 +1,46 @@
+/* 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.
+ *
+ * Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
+ */
+#include "tomcrypt.h"
+
+/**
+  @file crypt_register_hash.c
+  Register a HASH, Tom St Denis
+*/
+
+/**
+   Register a hash with the descriptor table
+   @param hash   The hash you wish to register
+   @return value >= 0 if successfully added (or already present), -1 if unsuccessful
+*/
+int register_hash(const struct ltc_hash_descriptor *hash)
+{
+   int x;
+
+   LTC_ARGCHK(hash != NULL);
+
+   /* is it already registered? */
+   for (x = 0; x < TAB_SIZE; x++) {
+       if (memcmp(&hash_descriptor[x], hash, sizeof(struct ltc_hash_descriptor)) == 0) {
+          return x;
+       }
+   }
+
+   /* find a blank spot */
+   for (x = 0; x < TAB_SIZE; x++) {
+       if (hash_descriptor[x].name == NULL) {
+          XMEMCPY(&hash_descriptor[x], hash, sizeof(struct ltc_hash_descriptor));
+          return x;
+       }
+   }
+
+   /* no spot */
+   return -1;
+}