Some better memory maintenance.

MasterPassword/C/mpw-algorithm.h

@@ -6,13 +6,15 @@
 //  Copyright (c) 2014 Lyndir. All rights reserved.
 //
 
+#define MP_dkLen            64
+
 /** Derive the master key for a user based on their name and master password.
-  * @return A new 64-byte allocated buffer. */
+  * @return A new MP_dkLen-byte allocated buffer or NULL if an allocation error occurred. */
 const uint8_t *mpw_masterKeyForUser(
         const char *fullName, const char *masterPassword);
 
 /** Encode a password for the site from the given master key and site parameters.
-  * @return A newly allocated string. */
+  * @return A newly allocated string or NULL if an allocation error occurred. */
 const char *mpw_passwordForSite(
         const uint8_t *masterKey, const char *siteName, const MPSiteType siteType, const uint32_t siteCounter,
         const MPSiteVariant siteVariant, const char *siteContext);