macOS Code Signing

Code signing is required on macOS to allow your application to be listed in the Apple App Store and to prevent a warning that your application is broken and can not be started, when downloaded from the browser.

Prerequisites

Code signing on macOS requires enrolling to the Apple Developer program, which at the time of writing costs 99$ per year. You also need an Apple device where you perform the code signing. This is required by the signing process and due to Apple’s Terms and Conditions.

Signing

To setup code signing for macOS you must create an Apple code signing certificate and install it to your Mac computer keychain or export it to be used in CI/CD platforms.

Creating a signing certificate

To create a new signing certificate, you must generate a Certificate Signing Request (CSR) file from your Mac computer. See creating a certificate signing request to learn how to create the CSR for code signing.

On your Apple Developer account, navigate to the Certificates, IDs & Profiles page and click on the Create a certificate button to open the interface to create a new certificate. Choose the appropriate certificate type (Apple Distribution to submit apps to the App Store, and Developer ID Application to ship apps outside the App Store). Upload your CSR, and the certificate will be created.

Note

Only the Apple Developer Account Holder can create Developer ID Application certificates. But it can be associated with a different Apple ID by creating a CSR with a different user email address.

Downloading the certificate

On the Certificates, IDs & Profiles page, click on the certificate you want to use and click on the Download button. It saves a .cer file that installs the certificate on the keychain once opened.

Configuring Tauri

You can configure Tauri to use your certificate when building macOS apps on your local machine or when using CI/CD platforms.

Signing locally

With the certificate installed in your Mac computer keychain, you can configure Tauri to use it for code signing.

The name of the certificate’s keychain entry represents the signing identity, which can also be found by executing:

security find-identity -v -p codesigning

This identity can be provided in the tauri.conf.json > bundle > macOS > signingIdentity configuration option or via the APPLE_SIGNING_IDENTITY environment variable.

Note

A signing certificate is only valid if associated with your Apple ID. An invalid certificate won’t be listed on the Keychain Access > My Certificates tab or the security find-identity -v -p codesigning output. If the certificate does not download to the correct location, make sure the “login” option is selected in Keychain Access under “Default Keychains” when downloading the .cer file.

Signing in CI/CD platforms

To use the certificate in CI/CD platforms, you must export the certificate to a base64 string and configure the APPLE_CERTIFICATE and APPLE_CERTIFICATE_PASSWORD environment variables:

1. Open the Keychain Access app, click the My Certificates tab in the login keychain and find your certificate’s entry.
2. Expand the entry, double-click on the key item, and select Export "$KEYNAME".
3. Select the path to save the certificate’s .p12 file and define a password for the exported certificate.
4. Convert the .p12 file to base64 running the following script on the terminal:

openssl base64 -in /path/to/certificate.p12 -out certificate-base64.txt

5. Set the contents of the certificate-base64.txt file to the APPLE_CERTIFICATE environment variable.
6. Set the certificate password to the APPLE_CERTIFICATE_PASSWORD environment variable.

Notarization

To notarize your application, you must provide credentials for Tauri to authenticate with Apple:

• APPLE_API_ISSUER, APPLE_API_KEY and APPLE_API_KEY_PATH: authenticate using an App Store Connect API key

  Open the App Store Connect’s Users and Access page, select the Integrations tab, click on the Add button and select a name and the Developer access. The APPLE_API_ISSUER (Issuer ID) is presented above the keys table, and the APPLE_API_KEY is the value on the Key ID column on that table. You also need to download the private key, which can only be done once and is only visible after a page reload (the button is shown on the table row for the newly created key). The private key file path must be set via the APPLE_API_KEY_PATH environment variable.

• APPLE_ID, APPLE_PASSWORD and APPLE_TEAM_ID: authenticate using your Apple ID

  Alternatively, to authenticate with your Apple ID, set the APPLE_ID to your Apple account email and the APPLE_PASSWORD to an app-specific password for the Apple account.

Note

Notarization is required when using a Developer ID Application certificate.