sop / gcm

lib/GCM/GHASH.php

Indentation +85 added lines, -85 removed lines

@@ -13,94 +13,94 @@
  */
 class GHASH
 {
-    /**
-     * Fixed R-block.
-     *
-     * @var string
-     */
-    const R = "\xE1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
+	/**
+	 * Fixed R-block.
+	 *
+	 * @var string
+	 */
+	const R = "\xE1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
     
-    /**
-     * Hash subkey.
-     *
-     * @var string $_subkey
-     */
-    protected $_subkey;
+	/**
+	 * Hash subkey.
+	 *
+	 * @var string $_subkey
+	 */
+	protected $_subkey;
     
-    /**
-     * Constructor.
-     *
-     * @param string $subkey Hash subkey
-     */
-    public function __construct(string $subkey)
-    {
-        if (strlen($subkey) != 16) {
-            throw new \LengthException("Subkey must be 128 bits.");
-        }
-        $this->_subkey = $subkey;
-    }
+	/**
+	 * Constructor.
+	 *
+	 * @param string $subkey Hash subkey
+	 */
+	public function __construct(string $subkey)
+	{
+		if (strlen($subkey) != 16) {
+			throw new \LengthException("Subkey must be 128 bits.");
+		}
+		$this->_subkey = $subkey;
+	}
     
-    /**
-     * Compute hash.
-     *
-     * @param string $X Input string
-     * @return string Hash
-     */
-    public function compute(string $X): string
-    {
-        $len = strlen($X);
-        if (0 != $len % 16) {
-            throw new \UnexpectedValueException(
-                "Input string must be a multiple of 128 bits.");
-        }
-        $Y = GCM::ZB_128;
-        // number of 128-bit blocks
-        $m = $len >> 4;
-        for ($i = 0; $i < $m; ++$i) {
-            $xi = substr($X, $i << 4, 16);
-            $Y = $this->_mult($Y ^ $xi, $this->_subkey);
-        }
-        return $Y;
-    }
+	/**
+	 * Compute hash.
+	 *
+	 * @param string $X Input string
+	 * @return string Hash
+	 */
+	public function compute(string $X): string
+	{
+		$len = strlen($X);
+		if (0 != $len % 16) {
+			throw new \UnexpectedValueException(
+				"Input string must be a multiple of 128 bits.");
+		}
+		$Y = GCM::ZB_128;
+		// number of 128-bit blocks
+		$m = $len >> 4;
+		for ($i = 0; $i < $m; ++$i) {
+			$xi = substr($X, $i << 4, 16);
+			$Y = $this->_mult($Y ^ $xi, $this->_subkey);
+		}
+		return $Y;
+	}
     
-    /**
-     * Functor method for <code>compute</code>.
-     *
-     * @param string $arg
-     * @return string
-     */
-    public function __invoke(string $arg): string
-    {
-        return $this->compute($arg);
-    }
+	/**
+	 * Functor method for <code>compute</code>.
+	 *
+	 * @param string $arg
+	 * @return string
+	 */
+	public function __invoke(string $arg): string
+	{
+		return $this->compute($arg);
+	}
     
-    /**
-     * Apply block multiplication operation.
-     *
-     * See NIST SP-800-38D, chapter 6.3 for the details.
-     *
-     * @param string $X
-     * @param string $Y
-     * @return string
-     */
-    private function _mult(string $X, string $Y): string
-    {
-        $x = GCM::strToGMP($X);
-        $Z = GCM::strToGMP(GCM::ZB_128);
-        $V = GCM::strToGMP($Y);
-        $R = GCM::strToGMP(self::R);
-        for ($i = 0; $i < 128; ++$i) {
-            // if bit at X[i] is set
-            if (gmp_testbit($x, 127 - $i)) {
-                $Z ^= $V;
-            }
-            // if LSB(Vi) = 0
-            if (!gmp_testbit($V, 0)) {
-                $V >>= 1;
-            } else {
-                $V = ($V >> 1) ^ $R;
-            }
-        }
-        return GCM::gmpToStr($Z, 16);
-    }
+	/**
+	 * Apply block multiplication operation.
+	 *
+	 * See NIST SP-800-38D, chapter 6.3 for the details.
+	 *
+	 * @param string $X
+	 * @param string $Y
+	 * @return string
+	 */
+	private function _mult(string $X, string $Y): string
+	{
+		$x = GCM::strToGMP($X);
+		$Z = GCM::strToGMP(GCM::ZB_128);
+		$V = GCM::strToGMP($Y);
+		$R = GCM::strToGMP(self::R);
+		for ($i = 0; $i < 128; ++$i) {
+			// if bit at X[i] is set
+			if (gmp_testbit($x, 127 - $i)) {
+				$Z ^= $V;
+			}
+			// if LSB(Vi) = 0
+			if (!gmp_testbit($V, 0)) {
+				$V >>= 1;
+			} else {
+				$V = ($V >> 1) ^ $R;
+			}
+		}
+		return GCM::gmpToStr($Z, 16);
+	}
 }

examples/explicit-encrypt.php

Indentation +1 added lines, -1 removed lines

@@ -23,4 +23,4 @@
 // print the ciphertext along with the authentication tag
 // and the initialization vector
 echo bin2hex($ciphertext) . "\n" . bin2hex($auth_tag) . "\n" . bin2hex($iv) .
-     "\n";
+	 "\n";