[mod_auth] http_auth_const_time_memeq_pad()

rename http_auth_const_time_memeq() to http_auth_const_time_memeq_pad()
for constant time padded comparison of strings of potentially different
length

src/http_auth.c

@@ -51,7 +51,7 @@ void http_auth_backend_set (const http_auth_backend_t *backend)
 }
 
 
-int http_auth_const_time_memeq (const char *a, const size_t alen, const char *b, const size_t blen)
+int http_auth_const_time_memeq_pad (const void *a, const size_t alen, const void *b, const size_t blen)
 {
     /* constant time memory compare, unless compiler figures it out
      * (similar to mod_secdownload.c:const_time_memeq()) */

src/http_auth.h

@@ -69,7 +69,9 @@ const http_auth_scheme_t * http_auth_scheme_get (const buffer *name);
 void http_auth_scheme_set (const http_auth_scheme_t *scheme);
 const http_auth_backend_t * http_auth_backend_get (const buffer *name);
 void http_auth_backend_set (const http_auth_backend_t *backend);
-int http_auth_const_time_memeq (const char *a, size_t alen, const char *b, size_t blen);
+
+__attribute_pure__
+int http_auth_const_time_memeq_pad (const void *a, size_t alen, const void *b, size_t blen);
 
 void http_auth_setenv(connection *con, const char *username, size_t ulen, const char *auth_type, size_t alen);
 

src/mod_authn_file.c

@@ -443,7 +443,7 @@ static handler_t mod_authn_file_plain_basic(server *srv, connection *con, void *
     mod_authn_file_patch_connection(srv, con, p);
     rc = mod_authn_file_htpasswd_get(srv, p->conf.auth_plain_userfile, CONST_BUF_LEN(username), password_buf);
     if (0 == rc) {
-        rc = http_auth_const_time_memeq(CONST_BUF_LEN(password_buf), pw, strlen(pw)) ? 0 : -1;
+        rc = http_auth_const_time_memeq_pad(CONST_BUF_LEN(password_buf), pw, strlen(pw)) ? 0 : -1;
     }
     buffer_free(password_buf);
     return 0 == rc && http_auth_match_rules(require, username->ptr, NULL, NULL)