1 files changed, 163 insertions, 0 deletions

diff --git a/vendor/paragonie/sodium_compat/src/Core32/SecretStream/State.php b/vendor/paragonie/sodium_compat/src/Core32/SecretStream/State.php
new file mode 100644
index 0000000..6f20486
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/SecretStream/State.php
@@ -0,0 +1,163 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core32_SecretStream_State
+ */
+class ParagonIE_Sodium_Core32_SecretStream_State
+{
+    /** @var string $key */
+    protected $key;
+
+    /** @var int $counter */
+    protected $counter;
+
+    /** @var string $nonce */
+    protected $nonce;
+
+    /** @var string $_pad */
+    protected $_pad;
+
+    /**
+     * ParagonIE_Sodium_Core32_SecretStream_State constructor.
+     * @param string $key
+     * @param string|null $nonce
+     */
+    public function __construct($key, $nonce = null)
+    {
+        $this->key = $key;
+        $this->counter = 1;
+        if (is_null($nonce)) {
+            $nonce = str_repeat("\0", 12);
+        }
+        $this->nonce = str_pad($nonce, 12, "\0", STR_PAD_RIGHT);;
+        $this->_pad = str_repeat("\0", 4);
+    }
+
+    /**
+     * @return self
+     */
+    public function counterReset()
+    {
+        $this->counter = 1;
+        $this->_pad = str_repeat("\0", 4);
+        return $this;
+    }
+
+    /**
+     * @return string
+     */
+    public function getKey()
+    {
+        return $this->key;
+    }
+
+    /**
+     * @return string
+     */
+    public function getCounter()
+    {
+        return ParagonIE_Sodium_Core32_Util::store32_le($this->counter);
+    }
+
+    /**
+     * @return string
+     */
+    public function getNonce()
+    {
+        if (!is_string($this->nonce)) {
+            $this->nonce = str_repeat("\0", 12);
+        }
+        if (ParagonIE_Sodium_Core32_Util::strlen($this->nonce) !== 12) {
+            $this->nonce = str_pad($this->nonce, 12, "\0", STR_PAD_RIGHT);
+        }
+        return $this->nonce;
+    }
+
+    /**
+     * @return string
+     */
+    public function getCombinedNonce()
+    {
+        return $this->getCounter() .
+            ParagonIE_Sodium_Core32_Util::substr($this->getNonce(), 0, 8);
+    }
+
+    /**
+     * @return self
+     */
+    public function incrementCounter()
+    {
+        ++$this->counter;
+        return $this;
+    }
+
+    /**
+     * @return bool
+     */
+    public function needsRekey()
+    {
+        return ($this->counter & 0xffff) === 0;
+    }
+
+    /**
+     * @param string $newKeyAndNonce
+     * @return self
+     */
+    public function rekey($newKeyAndNonce)
+    {
+        $this->key = ParagonIE_Sodium_Core32_Util::substr($newKeyAndNonce, 0, 32);
+        $this->nonce = str_pad(
+            ParagonIE_Sodium_Core32_Util::substr($newKeyAndNonce, 32),
+            12,
+            "\0",
+            STR_PAD_RIGHT
+        );
+        return $this;
+    }
+
+    /**
+     * @param string $str
+     * @return self
+     */
+    public function xorNonce($str)
+    {
+        $this->nonce = ParagonIE_Sodium_Core32_Util::xorStrings(
+            $this->getNonce(),
+            str_pad(
+                ParagonIE_Sodium_Core32_Util::substr($str, 0, 8),
+                12,
+                "\0",
+                STR_PAD_RIGHT
+            )
+        );
+        return $this;
+    }
+
+    /**
+     * @param string $string
+     * @return self
+     */
+    public static function fromString($string)
+    {
+        $state = new ParagonIE_Sodium_Core32_SecretStream_State(
+            ParagonIE_Sodium_Core32_Util::substr($string, 0, 32)
+        );
+        $state->counter = ParagonIE_Sodium_Core32_Util::load_4(
+            ParagonIE_Sodium_Core32_Util::substr($string, 32, 4)
+        );
+        $state->nonce = ParagonIE_Sodium_Core32_Util::substr($string, 36, 12);
+        $state->_pad = ParagonIE_Sodium_Core32_Util::substr($string, 48, 8);
+        return $state;
+    }
+
+    /**
+     * @return string
+     */
+    public function toString()
+    {
+        return $this->key .
+            $this->getCounter() .
+            $this->nonce .
+            $this->_pad;
+    }
+}