How to use the php interface and ECharts to implement data encryption and decryption of statistical charts

In web applications, statistical charts are often needed to display data and trends. The statistical chart function can be easily implemented using the PHP interface and ECharts. However, sometimes sensitive data needs to be encrypted to ensure security, so the data needs to be encrypted and decrypted. This article will introduce how to use the PHP interface and ECharts to implement data encryption and decryption of statistical charts, and provide specific code examples.

1. Encrypted data

In PHP, you can use the openssl_encrypt function to encrypt sensitive data. This function accepts four parameters: encryption algorithm, key, plaintext, and encryption options. Here is an example of a simple encryption function:

function encrypt($plaintext, $encryption_key) {
  $cipher = "AES-128-CBC";
  $ivlen = openssl_cipher_iv_length($cipher);
  $iv = openssl_random_pseudo_bytes($ivlen);
  $ciphertext_raw = openssl_encrypt($plaintext, $cipher, $encryption_key, $options=OPENSSL_RAW_DATA, $iv);
  $hmac = hash_hmac('sha256', $ciphertext_raw, $encryption_key, $as_binary=true);
  return base64_encode( $iv.$hmac.$ciphertext_raw );
}

When calling this function, pass the plaintext to be encrypted and the encryption key. For example:

$encryption_key = "my_secret_key";
$plaintext = "sensitive_data";
$ciphertext = encrypt($plaintext, $encryption_key);

After encryption, we save $ciphertext in the database or send it to the client for later use.

2. Decrypt data

We can use openssl_decrypt function to decrypt encrypted data. This function accepts four parameters: decryption algorithm, key, ciphertext, and decryption options. Here is an example of a simple decryption function:

function decrypt($ciphertext, $encryption_key) {
  $c = base64_decode($ciphertext);
  $cipher = "AES-128-CBC";
  $ivlen = openssl_cipher_iv_length($cipher);
  $iv = substr($c, 0, $ivlen);
  $hmac = substr($c, $ivlen, $sha2len=32);
  $ciphertext_raw = substr($c, $ivlen+$sha2len);
  $calcmac = hash_hmac('sha256', $ciphertext_raw, $encryption_key, $as_binary=true);
  if (!hash_equals($hmac, $calcmac)) { return null; }
  $plaintext = openssl_decrypt($ciphertext_raw, $cipher, $encryption_key, $options=OPENSSL_RAW_DATA, $iv);
  return $plaintext;
}

When calling this function, pass the ciphertext to be decrypted and the decryption key. For example:

$encryption_key = "my_secret_key";
$plaintext = decrypt($ciphertext, $encryption_key);

$plaintext is the sensitive data before encryption. If the key is incorrect or the data has been tampered with, the function returns null.

3. Use ECharts to display statistical charts

ECharts is an open source visualization library based on JavaScript that can easily create dynamic statistical charts that can be interacted with users. Here is a simple example showing how to use ECharts to display a basic histogram:

<script src="https://cdn.staticfile.org/echarts/4.7.0/echarts.min.js"></script>
<script>
var myChart = echarts.init(document.getElementById('chart'));
var option = {
  title: { text: 'My Chart' },
  tooltip: {},
  xAxis: { data: ['A', 'B', 'C', 'D', 'E'] },
  yAxis: {},
  series: [{
    name: 'Data',
    type: 'bar',
    data: [5, 20, 36, 10, 10]
  }]
};
myChart.setOption(option);
</script>
<div id="chart" style="height: 400px;"></div>

This code will create a histogram named "My Chart" with data displayed in A, B, C, D and E, the values ​​are 5, 20, 36, 10 and 10. One of the advantages of using ECharts is that it can be used with PHP and other backend languages ​​to dynamically load data from the server.

4. Using encrypted data with ECharts

In order to use encrypted data with ECharts, the ciphertext needs to be sent to the client. Here is a simple example of using encrypted data with ECharts using PHP and JavaScript:

<script>
var myChart = echarts.init(document.getElementById('chart'));
var url = "data.php?ciphertext=<?php echo $ciphertext; ?>";
myChart.showLoading();
$.getJSON(url, function(data) {
  myChart.hideLoading();
  myChart.setOption({
    title: { text: 'My Chart' },
    tooltip: {},
    xAxis: { data: data.labels },
    yAxis: {},
    series: [{
      name: 'Data',
      type: 'bar',
      data: data.values
    }]
  });
});
</script>

This code will create a histogram called "My Chart", but when reading the data requires passing "data. php" as the middleman. In order to use this method, the "data.php" file needs to be created:

<?php
$encryption_key = "my_secret_key";
$ciphertext = $_GET["ciphertext"];
$plaintext = decrypt($ciphertext, $encryption_key);
$data = array(
  "labels" => array("A", "B", "C", "D", "E"),
  "values" => array(5, 20, 36, 10, 10)
);
echo json_encode($data);
?>

This code will decrypt the data from the encrypted ciphertext and return the JSON formatted data that will be used in ECharts. In this example, the data is hardcoded, but they can be easily fetched from the server.

By combining data encryption and decryption with ECharts, you can flexibly and securely present eye-catching statistical charts while maximizing the protection of sensitive data.

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