init web ems all

phpMyAdmin/vendor/pragmarx/google2fa/src/Support/Base32.php

@@ -0,0 +1,135 @@
+<?php
+
+namespace PragmaRX\Google2FA\Support;
+
+use ParagonIE\ConstantTime\Base32 as ParagonieBase32;
+use PragmaRX\Google2FA\Exceptions\IncompatibleWithGoogleAuthenticatorException;
+use PragmaRX\Google2FA\Exceptions\InvalidCharactersException;
+
+trait Base32
+{
+    /**
+     * Enforce Google Authenticator compatibility.
+     */
+    protected $enforceGoogleAuthenticatorCompatibility = true;
+
+    /**
+     * Generate a digit secret key in base32 format.
+     *
+     * @param int $length
+     *
+     * @return string
+     */
+    public function generateBase32RandomKey($length = 16, $prefix = '')
+    {
+        $secret = $prefix ? $this->toBase32($prefix) : '';
+
+        $secret = $this->strPadBase32($secret, $length);
+
+        $this->validateSecret($secret);
+
+        return $secret;
+    }
+
+    /**
+     * Decodes a base32 string into a binary string.
+     *
+     * @param string $b32
+     *
+     * @throws InvalidCharactersException
+     *
+     * @return int
+     */
+    public function base32Decode($b32)
+    {
+        $b32 = strtoupper($b32);
+
+        $this->validateSecret($b32);
+
+        return ParagonieBase32::decodeUpper($b32);
+    }
+
+    /**
+     * Pad string with random base 32 chars.
+     *
+     * @param $string
+     * @param $length
+     *
+     * @return string
+     */
+    private function strPadBase32($string, $length)
+    {
+        for ($i = 0; $i < $length; $i++) {
+            $string .= substr(Constants::VALID_FOR_B32_SCRAMBLED, $this->getRandomNumber(), 1);
+        }
+
+        return $string;
+    }
+
+    /**
+     * Encode a string to Base32.
+     *
+     * @param $string
+     *
+     * @return mixed
+     */
+    public function toBase32($string)
+    {
+        $encoded = ParagonieBase32::encodeUpper($string);
+
+        return str_replace('=', '', $encoded);
+    }
+
+    /**
+     * Get a random number.
+     *
+     * @param $from
+     * @param $to
+     *
+     * @return int
+     */
+    protected function getRandomNumber($from = 0, $to = 31)
+    {
+        return random_int($from, $to);
+    }
+
+    /**
+     * Validate the secret.
+     *
+     * @param $b32
+     */
+    protected function validateSecret($b32)
+    {
+        $this->checkForValidCharacters($b32);
+
+        $this->checkGoogleAuthenticatorCompatibility($b32);
+    }
+
+    /**
+     * Check if the secret key is compatible with Google Authenticator.
+     *
+     * @param $b32
+     *
+     * @throws IncompatibleWithGoogleAuthenticatorException
+     */
+    protected function checkGoogleAuthenticatorCompatibility($b32)
+    {
+        if ($this->enforceGoogleAuthenticatorCompatibility && ((strlen($b32) & (strlen($b32) - 1)) !== 0)) {
+            throw new IncompatibleWithGoogleAuthenticatorException();
+        }
+    }
+
+    /**
+     * Check if all secret key characters are valid.
+     *
+     * @param $b32
+     *
+     * @throws InvalidCharactersException
+     */
+    protected function checkForValidCharacters($b32)
+    {
+        if (preg_replace('/[^'.Constants::VALID_FOR_B32.']/', '', $b32) !== $b32) {
+            throw new InvalidCharactersException();
+        }
+    }
+}