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Getting a License for Android SDK

You can generate the trial license here or contact us by email to get a productive license. To create the license, your applicationId (bundle id) is required.

To pass your license file to the SDK, call the OzLivenessSDK.init method with a list of LicenseSources. Use one of the following:

LicenseSource.LicenseAssetId should contain a path to a license file called forensics.license, which has to be located in the project's res/raw folder.
LicenseSource.LicenseFilePath should contain a file path to the place in the device's storage where the license file is located.

OzLivenessSDK.init(context,
    listOf(
        LicenseSource.LicenseAssetId(R.raw.your_license_name),
        LicenseSource.LicenseFilePath("absolute_path_to_your_license_file")
    ),
    object : StatusListener<LicensePayload> {
        override fun onSuccess(result: LicensePayload) { /*check the license payload*/ }
        override fun onError(error: OzException) { /*handle the exception */ }
    }
  )

OzLivenessSDK.INSTANCE.getConfig().setBaseURL(BASE_URL);
OzLivenessSDK.INSTANCE.init(context,
    Arrays.asList(
        new LicenseSource.LicenseAssetId(R.raw.forensics),
        new LicenseSource.LicenseFilePath("absolute_path_to_your_license_file")
    ),
    new StatusListener<LicensePayload>() {
        @Override public void onStatusChanged(@Nullable String s) {}
        @Override public void onSuccess(LicensePayload licensePayload) { /*check the license payload*/ }
        @Override public void onError(@NonNull OzException e) { /*handle the exception */ }
    }
);

In case of any license errors, the onError function is called. Use it to handle the exception as shown above. Otherwise, the system will return information about license. To check the license data manually, use the getLicensePayload method.

Possible License Errors

Error message

What to Do

Master License for Android

Master license is the offline license that allows using Mobile SDKs with any bundle_id, unlike the regular licenses. To get a master license, create a pair of keys as shown below. Email us the public key, and we will email you the master license shortly after that. Your application needs to sign its bundle_id with the private key, and the Mobile SDK checks the signature using the public key from the master license. Master licenses are time-limited.

Generating Keys

This section describes the process of creating your private and public keys.

Creating a Private Key

To create a private key, run the commands below one by one.

openssl genpkey -algorithm RSA -outform DER -out privateKey.der -pkeyopt rsa_keygen_bits:2048
# for MacOS
base64 -i privateKey.der -o privateKey.txt
# for Linux 
base64 -w 0 privateKey.der > privateKey.txt

You will get these files:

privateKey.der is a private .der key;
privateKey.txt is privateKey.der encoded by base64. This key containing will be used as the host app bundle_id signature.

File examples:

The OpenSSL command specification: https://www.openssl.org/docs/man1.1.1/man1/openssl-pkcs8.html

Creating a Public Key

To create a public key, run this command.

openssl rsa -pubout -in privateKey.der -out publicKey.pub

You will get the public key file: publicKey.pub. To get a license, please email us this file. We will email you the license.

File example:

SDK Integration

SDK initialization:

fun init(
    context: Context,
    licenseSources: List<LicenseSource>,
    masterLicenseSignature: String,
    statusListener: StatusListener<LicensePayload>? = null,
)

For Android 6.0 (API level 23) and older:

Add the implementation 'com.madgag.spongycastle:prov:1.58.0.0' dependency;
Before creating a signature, call Security.insertProviderAt(org.spongycastle.jce.provider.BouncyCastleProvider(), 1)

Prior to the SDK initializing, create a base64-encoded signature for the host app bundle_id using the private key.

Signature creation example:

private fun getMasterSignature(): String {
    Security.insertProviderAt(org.spongycastle.jce.provider.BouncyCastleProvider(), 1)

    val privateKeyBase64String = "the string copied from the privateKey.txt file"
    // with key example:
    // val privateKeyBase64String = "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"
    val sig = Signature.getInstance("SHA512WithRSA")
    val keySpec = PKCS8EncodedKeySpec(Base64.decode(privateKeyBase64String, Base64.DEFAULT))
    val keyFactory = KeyFactory.getInstance("RSA")
    sig.initSign(keyFactory.generatePrivate(keySpec))
    sig.update(packageName.toByteArray(Charsets.UTF_8))
    return Base64.encodeToString(sig.sign(), Base64.DEFAULT).replace("\n", "")
}

Signature example for com.ozforensics.liveness.demo

Please note: this signature does not match with the pair of keys listed above.

KohJ1rsUgLMzZHpHGAZDK2efHPnMj9tw9VIedBLvyZt0B2JH3SWfJLJ8X6JNz3bR2sce6PR2wdEIFln0r1pUnD+6WBCgexKIHAv7esiRVQZoZOEANDBwDvJVv73H/0qL2LGlhxKzbBg5CxGPClTBQdLo1P+7HsTXHHG/Hf6m3rdu1OUeGXVPoaS2NzE8kiRH6gb8Nhr7PBLTUeMKTeLoiX13hvwjOqhV1ANhgS97T4hC2+ZilZt4RektgRY/+fGmWnOqErNeYuz/WSInfaJS0YEWhJW3gXKPjdCzNGIBIqbxaFSjU46wu/alh2+tBRFnrYFl1dRQVcTlW0VwwZHcug==

Pass the signature as the masterLicenseSignature parameter during the SDK initialization.

If the signature is invalid, the initialization continues as usual: the SDK checks the list of bundle_id included into the license, like it does it by default without a master license.