Also set the queue types map when rebuilding the ready queue map

[lhc/web/wiklou.git] / includes / GlobalFunctions.php

diff --git a/includes/GlobalFunctions.php b/includes/GlobalFunctions.php
index 9cbb9d6..c95c380 100644 (file)
--- a/includes/GlobalFunctions.php
+++ b/includes/GlobalFunctions.php
@@ -104,6 +104,53 @@ if ( !function_exists( 'gzdecode' ) ) {
                return gzinflate( substr( $data, 10, -8 ) );
        }
 }
+
+// hash_equals function only exists in PHP >= 5.6.0
+if ( !function_exists( 'hash_equals' ) ) {
+       /**
+        * Check whether a user-provided string is equal to a fixed-length secret without
+        * revealing bytes of the secret through timing differences.
+        *
+        * This timing guarantee -- that a partial match takes the same time as a complete
+        * mismatch -- is why this function is used in some security-sensitive parts of the code.
+        * For example, it shouldn't be possible to guess an HMAC signature one byte at a time.
+        *
+        * Longer explanation: http://www.emerose.com/timing-attacks-explained
+        *
+        * @codeCoverageIgnore
+        * @param string $known_string Fixed-length secret to compare against
+        * @param string $user_string User-provided string
+        * @return bool True if the strings are the same, false otherwise
+        */
+       function hash_equals( $known_string, $user_string ) {
+               // Strict type checking as in PHP's native implementation
+               if ( !is_string( $known_string ) ) {
+                       trigger_error( 'hash_equals(): Expected known_string to be a string, ' .
+                               gettype( $known_string ) . ' given', E_USER_WARNING );
+
+                       return false;
+               }
+
+               if ( !is_string( $user_string ) ) {
+                       trigger_error( 'hash_equals(): Expected user_string to be a string, ' .
+                               gettype( $user_string ) . ' given', E_USER_WARNING );
+
+                       return false;
+               }
+
+               // Note that we do one thing PHP doesn't: try to avoid leaking information about
+               // relative lengths of $known_string and $user_string, and of multiple $known_strings.
+               // However, lengths may still inevitably leak through, for example, CPU cache misses.
+               $known_string_len = strlen( $known_string );
+               $user_string_len = strlen( $user_string );
+               $result = $known_string_len ^ $user_string_len;
+               for ( $i = 0; $i < $user_string_len; $i++ ) {
+                       $result |= ord( $known_string[$i % $known_string_len] ) ^ ord( $user_string[$i] );
+               }
+
+               return ( $result === 0 );
+       }
+}
 /// @endcond
 
 /**