Online PHP editor | refs for XVAq1

<?php //bk2020 cc0 // SipHash-2-4 // Aumasson and Bernstein 2012, https://131002.net/siphash/ // https://github.com/jedisct1/libsodium/tree/master/src/libsodium/crypto_shorthash // https://github.com/php/php-src/tree/master/ext/sodium/libsodium.c#L472 function bytes_as_hex(&$str, $len=null) { if( !$len ) { $len = strlen($str); } // zero-based array index for unpack, kennwhite 2005: // https://www.php.net/manual/en/function.unpack.php#45188 $arrhead = array_merge( unpack('C*', substr($str,0,$len)) ); return array_reduce( $arrhead, function($a,$b) { return ($b>15) ? $a.dechex($b) : $a.'0'.dechex($b); }, '' ); } $SIPHASH = null; if( function_exists('\sodium_crypto_shorthash') ) { $SIPHASH = 'sodium_crypto_shorthash'; } else if( function_exists('\Sodium\crypto_shorthash') ) { $SIPHASH = '\Sodium\crypto_shorthash'; } else { die('Unable to test SipHash-2-4 using sodium_crypto_shorthash'); } $SIPKEY = '1234567890abcdef'; // 16-byte key for SipHash-2-4 echo '# ', $SIPHASH, PHP_EOL; // thanks to: https://3v4l.org/EsGSU // (note: bin2hex won't print leading zero on byte values <16) for ($i = 0; $i < 256; ++$i) { $msg = bin2hex( chr(($i & 0x3F) | 0x80) ); $aref = hrtime(); $hsh = $SIPHASH( $msg, $SIPKEY ); $anow = hrtime(); $nanos = ($anow[0]===$aref[0]) ? $anow[1]-$aref[1] : -1; echo $i, "\t", bytes_as_hex($hsh,8), "\t", $nanos, PHP_EOL; }