*/
class MWCryptRand {
-
/**
* Minimum number of iterations we want to make in our drift calculations.
*/
$files[] = __DIR__;
$files[] = dirname( __DIR__ );
- // The config file is likely the most often edited file we know should be around
- // so include its stat info into the state.
- // The constant with its location will almost always be defined, as WebStart.php defines
- // MW_CONFIG_FILE to $IP/LocalSettings.php unless being configured with MW_CONFIG_CALLBACK (eg. the installer)
+ // The config file is likely the most often edited file we know should
+ // be around so include its stat info into the state.
+ // The constant with its location will almost always be defined, as
+ // WebStart.php defines MW_CONFIG_FILE to $IP/LocalSettings.php unless
+ // being configured with MW_CONFIG_CALLBACK (e.g. the installer).
if ( defined( 'MW_CONFIG_FILE' ) ) {
$files[] = MW_CONFIG_FILE;
}
* @author Tim Starling
*/
protected function driftHash( $data ) {
- // Minimum number of iterations (to avoid slow operations causing the loop to gather little entropy)
+ // Minimum number of iterations (to avoid slow operations causing the
+ // loop to gather little entropy)
$minIterations = self::MIN_ITERATIONS;
// Duration of time to spend doing calculations (in seconds)
$duration = ( self::MSEC_PER_BYTE / 1000 ) * $this->hashLength();
"(time-taken=" . ( $timeTaken * 1000 ) . "ms, " .
"iterations=$iterations, " .
"time-per-iteration=" . ( $timeTaken / $iterations * 1e6 ) . "us)\n" );
+
return $data;
}
// Generate a new random state based on the initial random state or previous
// random state by combining it with clock drift
$state = $this->driftHash( $state );
+
return $state;
}
if ( in_array( $algorithm, $algos ) ) {
$this->algo = $algorithm;
wfDebug( __METHOD__ . ": Using the {$this->algo} hash algorithm.\n" );
+
return $this->algo;
}
}
if ( is_null( $this->hashLength ) ) {
$this->hashLength = strlen( $this->hash( '' ) );
}
+
return $this->hashLength;
}
if ( is_null( $this->strong ) ) {
throw new MWException( __METHOD__ . ' called before generation of random data' );
}
+
return $this->strong;
}
public function realGenerate( $bytes, $forceStrong = false ) {
wfProfileIn( __METHOD__ );
- wfDebug( __METHOD__ . ": Generating cryptographic random bytes for " . wfGetAllCallers( 5 ) . "\n" );
+ wfDebug( __METHOD__ . ": Generating cryptographic random bytes for " .
+ wfGetAllCallers( 5 ) . "\n" );
$bytes = floor( $bytes );
static $buffer = '';
wfDebug( __METHOD__ . ": mcrypt_create_iv returned false.\n" );
} else {
$buffer .= $iv;
- wfDebug( __METHOD__ . ": mcrypt_create_iv generated " . strlen( $iv ) . " bytes of randomness.\n" );
+ wfDebug( __METHOD__ . ": mcrypt_create_iv generated " . strlen( $iv ) .
+ " bytes of randomness.\n" );
}
wfProfileOut( __METHOD__ . '-mcrypt' );
}
}
if ( strlen( $buffer ) < $bytes ) {
- // If available make use of openssl's random_pseudo_bytes method to attempt to generate randomness.
- // However don't do this on Windows with PHP < 5.3.4 due to a bug:
+ // If available make use of openssl's random_pseudo_bytes method to
+ // attempt to generate randomness. However don't do this on Windows
+ // with PHP < 5.3.4 due to a bug:
// http://stackoverflow.com/questions/1940168/openssl-random-pseudo-bytes-is-slow-php
// http://git.php.net/?p=php-src.git;a=commitdiff;h=cd62a70863c261b07f6dadedad9464f7e213cad5
if ( function_exists( 'openssl_random_pseudo_bytes' )
wfDebug( __METHOD__ . ": openssl_random_pseudo_bytes returned false.\n" );
} else {
$buffer .= $openssl_bytes;
- wfDebug( __METHOD__ . ": openssl_random_pseudo_bytes generated " . strlen( $openssl_bytes ) . " bytes of " . ( $openssl_strong ? "strong" : "weak" ) . " randomness.\n" );
+ wfDebug( __METHOD__ . ": openssl_random_pseudo_bytes generated " .
+ strlen( $openssl_bytes ) . " bytes of " .
+ ( $openssl_strong ? "strong" : "weak" ) . " randomness.\n" );
}
if ( strlen( $buffer ) >= $bytes ) {
// openssl tells us if the random source was strong, if some of our data was generated
}
// Only read from urandom if we can control the buffer size or were passed forceStrong
- if ( strlen( $buffer ) < $bytes && ( function_exists( 'stream_set_read_buffer' ) || $forceStrong ) ) {
+ if ( strlen( $buffer ) < $bytes &&
+ ( function_exists( 'stream_set_read_buffer' ) || $forceStrong )
+ ) {
wfProfileIn( __METHOD__ . '-fopen-urandom' );
$rem = $bytes - strlen( $buffer );
if ( !function_exists( 'stream_set_read_buffer' ) && $forceStrong ) {
- wfDebug( __METHOD__ . ": Was forced to read from /dev/urandom without control over the buffer size.\n" );
+ wfDebug( __METHOD__ . ": Was forced to read from /dev/urandom " .
+ "without control over the buffer size.\n" );
}
// /dev/urandom is generally considered the best possible commonly
// available random source, and is available on most *nix systems.
$random_bytes = fread( $urandom, max( $chunk_size, $rem ) );
$buffer .= $random_bytes;
fclose( $urandom );
- wfDebug( __METHOD__ . ": /dev/urandom generated " . strlen( $random_bytes ) . " bytes of randomness.\n" );
+ wfDebug( __METHOD__ . ": /dev/urandom generated " . strlen( $random_bytes ) .
+ " bytes of randomness.\n" );
+
if ( strlen( $buffer ) >= $bytes ) {
// urandom is always strong, set to true if all our data was generated using it
$this->strong = true;
// We hash the random state with more salt to avoid the state from leaking
// out and being used to predict the /randomness/ that follows.
if ( strlen( $buffer ) < $bytes ) {
- wfDebug( __METHOD__ . ": Falling back to using a pseudo random state to generate randomness.\n" );
+ wfDebug( __METHOD__ .
+ ": Falling back to using a pseudo random state to generate randomness.\n" );
}
while ( strlen( $buffer ) < $bytes ) {
wfProfileIn( __METHOD__ . '-fallback' );
$generated = substr( $buffer, 0, $bytes );
$buffer = substr( $buffer, $bytes );
- wfDebug( __METHOD__ . ": " . strlen( $buffer ) . " bytes of randomness leftover in the buffer.\n" );
+ wfDebug( __METHOD__ . ": " . strlen( $buffer ) .
+ " bytes of randomness leftover in the buffer.\n" );
wfProfileOut( __METHOD__ );
+
return $generated;
}
$bytes = ceil( $chars / 2 );
// Generate the data and then convert it to a hex string
$hex = bin2hex( $this->generate( $bytes, $forceStrong ) );
+
// A bit of paranoia here, the caller asked for a specific length of string
// here, and it's possible (eg when given an odd number) that we may actually
// have at least 1 char more than they asked for. Just in case they made this
if ( is_null( self::$singleton ) ) {
self::$singleton = new self;
}
+
return self::$singleton;
}
public static function generateHex( $chars, $forceStrong = false ) {
return self::singleton()->realGenerateHex( $chars, $forceStrong );
}
-
}
dépôts / lhc / web / wiklou.git / blobdiff