When creating a new Credential for many connections you will need to provide the SHA-1 of the certificate you’re using to sign your application. When completing your Application’s configuration in the Auth0 Dashboard you will also need to provide the SHA-256 value. Locate the certificate you’re using to sign your application. If you don’t have one you can generate it. For production applications, you should do this. During development, you can sign your application with the default android.keystore certificate that was generated automatically for you when you installed the SDK. In this example we’re going to use this default keystore. To generate the key hashes using this keystore follow the examples below.

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Generating your key hashes

On Windows: keytool -list -v -keystore "%USERPROFILE%\.android\debug.keystore" -alias androiddebugkey -storepass android -keypass android On Linux / macOS: keytool -list -v -keystore ~/.android/debug.keystore -alias androiddebugkey -storepass android -keypass android Sample output: Alias name: androiddebugkey Creation date: Jan 01, 2013 Entry type: PrivateKeyEntry Certificate chain length: 1 Certificate[1]: Owner: CN=Android Debug, O=Android, C=US Issuer: CN=Android Debug, O=Android, C=US Serial number: 4aa9b300 Valid from: Mon Jan 01 08:04:04 UTC 2013 until: Mon Jan 01 18:04:04 PST 2033 Certificate fingerprints: MD5: AE:9F:95:D0:A6:86:89:BC:A8:70:BA:34:FF:6A:AC:F9 SHA1: BB:0D:AC:74:D3:21:E1:43:07:71:9B:62:90:AF:A1:66:6E:44:5D:75 SHA256: 15:B9:F9:33:9F:E4:E3:68:C2:10:49:17:5D:A8:77:12:7C:8E:57:E9:FF:B7:23:EA:CC:DD:56:08:06:C9:5E:33 Signature algorithm name: SHA256withRSA Version: 3

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Using your key hashes

Once you have your key hashes output, copy the resulting SHA256 value and go to your application’s settings in the Auth0 Dashboard. Click “Show Advanced Settings”, and in the “Device Settings” tab, under “Android”, fill the “App Package Name” with your application’s package name, and the “Key Hashes” field with the SHA256 value you copied. Don’t forget to save the changes. If you don’t add the Callback URL to the application settings nor the Key Hashes to the application’s device settings, the Auth0 server won’t return the call result to your application.