function findSingleByteXOR($cipherText)
{
for ($kv = 0; $kv < 256; $kv++) {
$charScore = 0;
$plainText = singleByteXOR($cipherText, chr($kv));
$charScore = englishLetterWeight($plainText, 5);
$scores[$kv] = $charScore;
}
return $scores;
}
<?php
require_once '../../functions/singleByteXOR.php';
if ($argc > 1) {
$input = hex2bin($argv[1]);
} else {
$input = hex2bin("1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736");
}
$scores = findSingleByteXOR($input);
arsort($scores);
$keyCount = 0;
foreach ($scores as $key => $value) {
if ($keyCount < 5) {
$decrypt = singleByteXOR($input, chr($key));
printf("'%1\$1c' (%1\$'03u) %2\$+09.3f : %3\$1s\n", $key, $value, $decrypt);
} else {
break;
}
$keyCount++;
}
}
fclose($file);
$linesKey = [];
//store best scoring key for each line
$linesScore = [];
//store best score for each line
foreach ($lines as $lineNumber => $line) {
$scores = findSingleByteXOR(hex2bin($line));
arsort($scores);
$keyCount = 0;
foreach ($scores as $key => $value) {
if ($keyCount < 1) {
$linesKey[$lineNumber] = $key;
$linesScore[$lineNumber] = $value;
} else {
break;
}
$keyCount++;
}
}
arsort($linesScore);
$lineCount = 0;
printf("LINE KEY KEY# SCORE OUTPUT\n");
foreach ($linesScore as $lineNumber => $lineScore) {
//return the top scoring entries in the file
if ($lineCount < 5) {
$decrypt = singleByteXOR(hex2bin($lines[$lineNumber]), chr($linesKey[$lineNumber]));
printf("#%1\$'03u '%2\$1c' (%2\$'03u) %3\$+09.3f : %4\$1s\n", $lineNumber, $linesKey[$lineNumber], $linesScore[$lineNumber], $decrypt);
}
$lineCount++;
}
