Using AWS Key Management Service to store passwords [closed]

Using AWS Key Management Service to store passwords [closed]

I obtained the code below from ChatGPT. It works but I'm trying to understand the purpose of KMS. Does it basically store passwords in KMS and allowing me to retrieve them each time I send over the CiphertextBlob? And could I store more than one password under one keyId? I tried and it worked but not sure if that's the recommended approach.

<?php
require 'vendor/autoload.php';
use Aws\Kms\KmsClient;

// AWS credentials
$credentials = [
  'key' => 'your_access_key',
  'secret' => 'your_secret_key',
  'region' => 'your_aws_region',
];

// Initialize KMS client
$kmsClient = new KmsClient([
  'version' => 'latest',
  'region' => $credentials['region'],
  'credentials' => $credentials,
]);

// Encrypt the password
$plaintextPassword = 'your_password';
$keyId = 'your_kms_key_id'; // The ID or ARN of the KMS key
$result = $kmsClient->encrypt([
  'KeyId' => $keyId,
  'Plaintext' => $plaintextPassword,
]);

$encryptedPassword = $result['CiphertextBlob'];

// Store or transmit $encryptedPassword securely
// Decrypt the password when needed
$decryptedResult = $kmsClient->decrypt([
  'KeyId' => $keyId,
  'CiphertextBlob' => $encryptedPassword,
]);

$decryptedPassword = $decryptedResult['Plaintext'];

// Use $decryptedPassword in your application