1 files changed, 39 insertions, 0 deletions
diff --git a/vendor/paragonie/sodium_compat/src/Core32/ChaCha20/IetfCtx.php b/vendor/paragonie/sodium_compat/src/Core32/ChaCha20/IetfCtx.php
new file mode 100644
index 0000000..eea08de
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/ChaCha20/IetfCtx.php
@@ -0,0 +1,39 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_ChaCha20_IetfCtx', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_ChaCha20_IetfCtx
+ */
+class ParagonIE_Sodium_Core32_ChaCha20_IetfCtx extends ParagonIE_Sodium_Core32_ChaCha20_Ctx
+{
+    /**
+     * ParagonIE_Sodium_Core_ChaCha20_IetfCtx constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $key     ChaCha20 key.
+     * @param string $iv      Initialization Vector (a.k.a. nonce).
+     * @param string $counter The initial counter value.
+     *                        Defaults to 4 0x00 bytes.
+     * @throws InvalidArgumentException
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function __construct($key = '', $iv = '', $counter = '')
+    {
+        if (self::strlen($iv) !== 12) {
+            throw new InvalidArgumentException('ChaCha20 expects a 96-bit nonce in IETF mode.');
+        }
+        parent::__construct($key, self::substr($iv, 0, 8), $counter);
+
+        if (!empty($counter)) {
+            $this->container[12] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($counter, 0, 4));
+        }
+        $this->container[13] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($iv, 0, 4));
+        $this->container[14] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($iv, 4, 4));
+        $this->container[15] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($iv, 8, 4));
+    }
+}