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Client credentials in MSAL Java

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There are three types of client secrets in MSAL4J:

  • Application Secrets
  • Certificates
  • Client assertions

Client Credentials with application secret in MSAL4J

During the registration of a the confidential client application with Microsoft Entra ID, a client secret is generated (a kind of application password). When the client wants to acquire a token in its own name it will:

  • Create IClientCredential using the ClientCredentialFactory, passing in the client secret, which should be a string.
String CLIENT_SECRET; 
IClientCredential credential = ClientCredentialFactory.createFromSecret(CLIENT_SECRET)

Client Credentials with certificate

In this case, when the application is registered with Microsoft Entra ID, it uploads the public key of a certificate. When it wants to acquire a token, the client application will

  • Create IClientCredential using the ClientCredentialFactory, passing in either both the public and private keys, or a InputStream of the pkcs12
PrivateKey privateKey;  
X509Certificate publicKey;  
IClientCredential credential = ClientCredentialFactory.createFromCertificate(privateKey, publicKey)

or

InputStream inputStream;  
String password;  
IClientCredential credential = ClientCredentialFactory.create(inputStream, password)
  • You would then create a confidential client application and pass in the client credential.
ConfidentialClientApplication app =
                    ConfidentialClientApplication.builder(
                        CLIENT_ID,
                        credential)
                .build();