Comment Vérifier si une Clé Privée Correspond à un Certificat Public (2024)

Lorsqu'il s'agit de la sécurité des serveurs et de la communication chiffrée, il est essentiel de s'assurer que la clé privée correspond au certificat public. Ces clés travaillent en tandem pour établir une connexion sécurisée, et leur incompatibilité peut poser de sérieux problèmes. Dans cet article, nous expliquerons comment déterminer si votre clé privée appartient à votre certificat public, et comment vérifier la correspondance de leurs valeurs.

Vérification de la Correspondance des Clés

Pour vérifier si votre clé privée correspond à votre certificat public, suivez les étapes ci-dessous :

  1. Ouvrez une fenêtre de terminal sur votre serveur.

  2. Validez la correspondance de la clé publique en exécutant la commande suivante :

    openssl x509 -noout -modulus -in <public.crt> | openssl md5 > /tmp/crt.pub

    Remarque : Assurez-vous de remplacer <public.crt> par le nom de votre fichier de certificat public.

  3. Validez la correspondance de la clé privée en exécutant la commande suivante :

    openssl rsa -noout -modulus -in <private.key> | openssl md5 > /tmp/key.pub

    Remarque : Assurez-vous de remplacer <private.key> par le nom de votre fichier de clé privée. Entrez le mot de passe si vous y êtes invité.

  4. Comparez les empreintes de hachage des deux fichiers avec la commande suivante :

    diff /tmp/crt.pub /tmp/key.pub

    Si rien n'est imprimé dans la console, cela signifie que la clé privée et le certificat public correspondent. Toute différence sera détaillée dans la console.

Conclusion

La correspondance entre la clé privée et le certificat public est cruciale pour assurer une communication sécurisée sur votre serveur. En suivant ces étapes, vous pouvez vérifier rapidement si vos clés sont compatibles, évitant ainsi les problèmes potentiels liés à l'encryption.

Ce guide vous a fourni les étapes essentielles pour vérifier la correspondance entre votre clé privée et votre certificat public. Assurez-vous de toujours effectuer cette vérification avant de mettre en place des communications chiffrées sur votre serveur pour garantir la sécurité de vos données et de vos utilisateurs.

N'oubliez pas que la sécurité de votre serveur est d'une importance capitale, et la vérification de la correspondance entre la clé privée et le certificat public est une étape cruciale dans ce processus.

Comment Vérifier si une Clé Privée Correspond à un Certificat Public (2024)

FAQs

How to verify certificate and private key match? ›

It's a three-part process to confirm the integrity of a key pair:
  1. Verify the integrity of a private key - that has not been tampered with.
  2. Verify the modulus of both private and public key match.
  3. Successfully perform encryption with the public key from the certificate and decryption with the private key.
Jul 13, 2024

How to determine if a private key belongs to a public certificate? ›

Those commands validate if the private key belongs to the public certificate:
  1. openssl x509 -noout -modulus -in <public.crt> | openssl md5 > /tmp/crt.pub. Note: Replace <public. ...
  2. openssl rsa -noout -modulus -in <private.key> | openssl md5 > /tmp/key.pub. Note: Replace <private. ...
  3. diff /tmp/crt.pub /tmp/key.pub.
Jul 24, 2023

How do I pair a private key with a certificate? ›

Open the Microsoft Management Console. Go to the menu option 'File', followed by the option 'Add/Remove Snap-in'. Click on 'Certificates' and click on 'Add'. Select the correct account in the Certificates Snap-in window and click on 'Next'.

How to verify a certificate is valid? ›

Chrome:
  1. Enter the URL of the website you want to check in your browser's address bar and press Enter.
  2. Click on the padlock icon in the address bar.
  3. Click on Connection is secure.
  4. Click on Certificate is valid to open the Certificate Viewer.
Oct 18, 2022

How to convert a CER to PEM? ›

Use the following command to convert a base64-encoded .cer file to a .pem format file:
  1. Syntax: openssl x509 -in <path-to-cer-file> -outform pem -out <path-to-pem-file>
  2. Example: openssl x509 -in C:\Certificates\AnyCert.cer -outform pem -out C:\Certificates\AnyCertInPem.pem.
Mar 3, 2024

How do I prove I have a private key? ›

You can use OpenSSL to show proof-of-possession (POP) of a private key by signing a test file with it. This method works for both RSA and ECC keys. What is OpenSSL? OpenSSL is a very useful open-source command-line toolkit for working with X.

What is the difference between a private key and a certificate? ›

Only the key owner can use the private key to encrypt a document, which generates a digital signature. An SSL certificate is a document that is digitally signed by a certificate authority (CA). The document contains information about a public key and the owner of the public key.

How do you check if a public key matches a private key? ›

To verify that an RSA private key matches the RSA public key in a certificate you need to i) verify the consistency of the private key and ii) compare the modulus of the public key in the certificate against the modulus of the private key. If it doesn't say 'RSA key ok', it isn't OK!"

How to validate CSR and private key? ›

How to verify compliance of SSL certificates with their CSR and private keys
  1. $ openssl x509 -noout -modulus -in ssl_certificate.crt | openssl md5. The command to display the private key modulus:
  2. $ openssl rsa -noout -modulus -in private.key | openssl md5. ...
  3. $ openssl req -noout -modulus -in csr_request.csr | openssl md5.

Can you verify signature with a private key? ›

Public and private keys alone, however, aren't enough to truly verify a signature. Even if you've verified that a signed file contains a matching key pair, you still need some way to confirm that the public key actually comes from the signer that it purports to come from.

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