version 0.3.33

[fms.git] / libs / libtomcrypt / misc / crypt / crypt_register_hash.c

diff --git a/libs/libtomcrypt/misc/crypt/crypt_register_hash.c b/libs/libtomcrypt/misc/crypt/crypt_register_hash.c
new file mode 100644 (file)
index 0000000..45d0e85
--- /dev/null
+++ b/libs/libtomcrypt/misc/crypt/crypt_register_hash.c
@@ -0,0 +1,54 @@
+/* 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@gmail.com, http://libtomcrypt.com
+ */
+#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? */
+   LTC_MUTEX_LOCK(&ltc_hash_mutex);
+   for (x = 0; x < TAB_SIZE; x++) {
+       if (XMEMCMP(&hash_descriptor[x], hash, sizeof(struct ltc_hash_descriptor)) == 0) {
+          LTC_MUTEX_UNLOCK(&ltc_hash_mutex);
+          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));
+          LTC_MUTEX_UNLOCK(&ltc_hash_mutex);
+          return x;
+       }
+   }
+
+   /* no spot */
+   LTC_MUTEX_UNLOCK(&ltc_hash_mutex);
+   return -1;
+}
+
+/* $Source: /cvs/libtom/libtomcrypt/src/misc/crypt/crypt_register_hash.c,v $ */
+/* $Revision: 1.6 $ */
+/* $Date: 2006/11/01 09:28:17 $ */