Générer des octets aléatoires

Cette rubrique explique comment récupérer des octets aléatoires du générateur de nombres aléatoires dans Cloud HSM.

Avant de commencer

• Accordez l'autorisation cloudkms.locations.generateRandomBytes dans les emplacements cloud où votre service générera des octets aléatoires. Pour en savoir plus sur les autorisations et les rôles dans Cloud Key Management Service, consultez la page Autorisations et rôles.

Générer des octets aléatoires

C#

Pour exécuter ce code, commencez par configurer un environnement de développement C#, puis installez le SDK Cloud KMS pour C#.

using Google.Api.Gax.ResourceNames;
using Google.Cloud.Kms.V1;

public class GenerateRandomBytesSample
{
    public byte[] GenerateRandomBytes(
      string projectId = "my-project", string locationId = "us-east1", int numBytes = 256)
    {
        // Create the client.
        KeyManagementServiceClient client = KeyManagementServiceClient.Create();

        // Build the location name.
        LocationName locationName = new LocationName(projectId, locationId);

        // Call the API.
        GenerateRandomBytesResponse result = client.GenerateRandomBytes(locationName.ToString(), numBytes, ProtectionLevel.Hsm);

        // The data comes back as raw bytes, which may include non-printable
        // characters. To print the result, you could encode it as base64.
        // string encodedData = result.Data.ToBase64();

        return result.Data.ToByteArray();
    }
}

Go

Pour exécuter ce code, commencez par configurer un environnement de développement Go, puis installez le SDK Cloud KMS pour Go.

import (
	"context"
	"encoding/base64"
	"fmt"
	"io"

	kms "cloud.google.com/go/kms/apiv1"
	"cloud.google.com/go/kms/apiv1/kmspb"
)

// generateRandomBytes generates random bytes with entropy sourced from the
// given location.
func generateRandomBytes(w io.Writer, location string, numBytes int32) error {
	// name := "projects/my-project/locations/us-east1"
	// numBytes := 256

	// Create the client.
	ctx := context.Background()
	client, err := kms.NewKeyManagementClient(ctx)
	if err != nil {
		return fmt.Errorf("failed to create kms client: %w", err)
	}
	defer client.Close()

	// Build the request.
	req := &kmspb.GenerateRandomBytesRequest{
		Location:        location,
		LengthBytes:     numBytes,
		ProtectionLevel: kmspb.ProtectionLevel_HSM,
	}

	// Generate random bytes.
	result, err := client.GenerateRandomBytes(ctx, req)
	if err != nil {
		return fmt.Errorf("failed to generate random bytes: %w", err)
	}

	// The data comes back as raw bytes, which may include non-printable
	// characters. This base64-encodes the result so it can be printed below.
	encodedData := base64.StdEncoding.EncodeToString(result.Data)

	fmt.Fprintf(w, "Random bytes: %s", encodedData)
	return nil
}

Java

Pour exécuter ce code, commencez par configurer un environnement de développement Java et installez le SDK Cloud KMS pour Java.

import com.google.cloud.kms.v1.GenerateRandomBytesResponse;
import com.google.cloud.kms.v1.KeyManagementServiceClient;
import com.google.cloud.kms.v1.LocationName;
import com.google.cloud.kms.v1.ProtectionLevel;
import java.io.IOException;
import java.util.Base64;

public class GenerateRandomBytes {

  public void generateRandomBytes() throws IOException {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String locationId = "us-east1";
    int numBytes = 256;
    generateRandomBytes(projectId, locationId, numBytes);
  }

  // Create a new key for use with MacSign.
  public void generateRandomBytes(String projectId, String locationId, int numBytes)
      throws IOException {
    // Initialize client that will be used to send requests. This client only
    // needs to be created once, and can be reused for multiple requests. After
    // completing all of your requests, call the "close" method on the client to
    // safely clean up any remaining background resources.
    try (KeyManagementServiceClient client = KeyManagementServiceClient.create()) {
      // Build the parent name for the location.
      LocationName locationName = LocationName.of(projectId, locationId);

      // Generate the bytes.
      GenerateRandomBytesResponse response =
          client.generateRandomBytes(locationName.toString(), numBytes, ProtectionLevel.HSM);

      // The data comes back as raw bytes, which may include non-printable
      // characters. This base64-encodes the result so it can be printed below.
      String encodedData = Base64.getEncoder().encodeToString(response.getData().toByteArray());

      System.out.printf("Random bytes: %s", encodedData);
    }
  }
}

Node.js

Pour exécuter ce code, commencez par configurer un environnement de développement Node.js, puis installez le SDK Cloud KMS pour Node.js.

//
// TODO(developer): Uncomment these variables before running the sample.
//
// const projectId = 'my-project';
// const locationId = 'us-east1';
// const numBytes = 256;

// Imports the Cloud KMS library
const {KeyManagementServiceClient} = require('@google-cloud/kms');

// Instantiates a client
const client = new KeyManagementServiceClient();

// Build the location name
const locationName = client.locationPath(projectId, locationId);

async function generateRandomBytes() {
  const [randomBytesResponse] = await client.generateRandomBytes({
    location: locationName,
    lengthBytes: numBytes,
    protectionLevel: 'HSM',
  });

  console.log(`Random bytes: ${randomBytesResponse.data.toString('base64')}`);
  return randomBytesResponse;
}

return generateRandomBytes();

PHP

Pour exécuter ce code, commencez par en apprendre plus sur l'utilisation de PHP sur Google Cloud, puis installez le SDK Cloud KMS pour PHP.

use Google\Cloud\Kms\V1\Client\KeyManagementServiceClient;
use Google\Cloud\Kms\V1\GenerateRandomBytesRequest;
use Google\Cloud\Kms\V1\ProtectionLevel;

/**
 * Generate a random byte string using Cloud KMS.
 *
 * @param string $projectId The Google Cloud project ID.
 * @param string $locationId The location ID (e.g. us-east1).
 * @param int $numBytes The number of bytes to generate.
 */
function generate_random_bytes(
    string $projectId,
    string $locationId = 'us-east1',
    int $numBytes = 256
) {
    // Create the Cloud KMS client.
    $client = new KeyManagementServiceClient();

    // Build the parent name.
    $locationName = $client->locationName($projectId, $locationId);

    // Call the API.
    $generateRandomBytesRequest = (new GenerateRandomBytesRequest())
        ->setLocation($locationName)
        ->setLengthBytes($numBytes)
        ->setProtectionLevel(ProtectionLevel::HSM);
    $randomBytesResponse = $client->generateRandomBytes($generateRandomBytesRequest);

    // The data comes back as raw bytes, which may include non-printable
    // characters. This base64-encodes the result so it can be printed below.
    $encodedData = base64_encode($randomBytesResponse->getData());
    printf('Random bytes: %s' . PHP_EOL, $encodedData);

    return $randomBytesResponse;
}

Python

Pour exécuter ce code, commencez par configurer un environnement de développement Python, puis installez le SDK Cloud KMS pour Python.

# Import base64 for encoding the bytes for printing.
import base64

# Import the client library.
from google.cloud import kms


def generate_random_bytes(project_id: str, location_id: str, num_bytes: int) -> bytes:
    """
    Generate random bytes with entropy sourced from the given location.

    Args:
        project_id (string): Google Cloud project ID (e.g. 'my-project').
        location_id (string): Cloud KMS location (e.g. 'us-east1').
        num_bytes (integer): number of bytes of random data.

    Returns:
        bytes: Encrypted ciphertext.

    """

    # Create the client.
    client = kms.KeyManagementServiceClient()

    # Build the location name.
    location_name = client.common_location_path(project_id, location_id)

    # Call the API.
    protection_level = kms.ProtectionLevel.HSM
    random_bytes_response = client.generate_random_bytes(
        request={
            "location": location_name,
            "length_bytes": num_bytes,
            "protection_level": protection_level,
        }
    )

    print(f"Random bytes: {base64.b64encode(random_bytes_response.data)}")
    return random_bytes_response

Ruby

Pour exécuter ce code, commencez par configurer un environnement de développement Ruby, puis installez le SDK Cloud KMS pour Ruby.

# TODO(developer): uncomment these values before running the sample.
# project_id  = "my-project"
# location_id = "us-east1"
# num_bytes = 256

# Require the library.
require "google/cloud/kms"

# Create the client.
client = Google::Cloud::Kms.key_management_service

# Build the parent location name.
location_name = client.location_path project:    project_id,
                                     location:   location_id

# Call the API.
response = client.generate_random_bytes location: location_name, length_bytes: num_bytes, protection_level: :HSM

# The data comes back as raw bytes, which may include non-printable
# characters. This base64-encodes the result so it can be printed below.
encoded_data = Base64.strict_encode64 response.data

puts "Random bytes: #{encoded_data}"

Limitations connues

• L'appel d'API GenerateRandomBytes peut produire au maximum 1 024 octets d'aléatoire par appel. Pour générer plus d'octets à caractère aléatoire, vous pouvez effectuer plusieurs appels d'API.

• L'appel d'API GenerateRandomBytes n'est pas disponible pour les niveaux de protection Logiciel ou Externe.