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node_modules/mysql2/lib/auth_plugins/sha256_password.js

@@ -0,0 +1,60 @@
+'use strict';
+
+const PLUGIN_NAME = 'sha256_password';
+const crypto = require('crypto');
+const { xor } = require('../auth_41');
+
+const REQUEST_SERVER_KEY_PACKET = Buffer.from([1]);
+
+const STATE_INITIAL = 0;
+const STATE_WAIT_SERVER_KEY = 1;
+const STATE_FINAL = -1;
+
+function encrypt(password, scramble, key) {
+  const stage1 = xor(
+    Buffer.from(`${password}\0`, 'utf8').toString('binary'),
+    scramble.toString('binary')
+  );
+  return crypto.publicEncrypt(key, stage1);
+}
+
+module.exports = (pluginOptions = {}) => ({ connection }) => {
+  let state = 0;
+  let scramble = null;
+
+  const password = connection.config.password;
+
+  const authWithKey = serverKey => {
+    const _password = encrypt(password, scramble, serverKey);
+    state = STATE_FINAL;
+    return _password;
+  };
+
+  return data => {
+    switch (state) {
+      case STATE_INITIAL:
+        scramble = data.slice(0, 20);
+        // if client provides key we can save one extra roundrip on first connection
+        if (pluginOptions.serverPublicKey) {
+          return authWithKey(pluginOptions.serverPublicKey);
+        }
+
+        state = STATE_WAIT_SERVER_KEY;
+        return REQUEST_SERVER_KEY_PACKET;
+
+      case STATE_WAIT_SERVER_KEY:
+        if (pluginOptions.onServerPublicKey) {
+          pluginOptions.onServerPublicKey(data);
+        }
+        return authWithKey(data);
+      case STATE_FINAL:
+        throw new Error(
+          `Unexpected data in AuthMoreData packet received by ${PLUGIN_NAME} plugin in STATE_FINAL state.`
+        );
+    }
+
+    throw new Error(
+      `Unexpected data in AuthMoreData packet received by ${PLUGIN_NAME} plugin in state ${state}`
+    );
+  };
+};