version 0.3.33

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

diff --git a/libs/libtomcrypt/misc/crypt/crypt_prng_is_valid.c b/libs/libtomcrypt/misc/crypt/crypt_prng_is_valid.c
new file mode 100644 (file)
index 0000000..6af0a3c
--- /dev/null
+++ b/libs/libtomcrypt/misc/crypt/crypt_prng_is_valid.c
@@ -0,0 +1,36 @@
+/* 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_prng_is_valid.c
+  Determine if PRNG is valid, Tom St Denis
+*/
+
+/*
+   Test if a PRNG index is valid
+   @param idx   The index of the PRNG to search for
+   @return CRYPT_OK if valid
+*/
+int prng_is_valid(int idx)
+{
+   LTC_MUTEX_LOCK(&ltc_prng_mutex);
+   if (idx < 0 || idx >= TAB_SIZE || prng_descriptor[idx].name == NULL) {
+      LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
+      return CRYPT_INVALID_PRNG;
+   }
+   LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
+   return CRYPT_OK;
+}
+
+/* $Source: /cvs/libtom/libtomcrypt/src/misc/crypt/crypt_prng_is_valid.c,v $ */
+/* $Revision: 1.5 $ */
+/* $Date: 2006/03/31 14:15:35 $ */