Play Integrity Exception "org.jose4j.lang.IntegrityException: A256KW key unwrap/decrypt failed"

[Jitendran]

We follow the below google and separate 1 developer blog
Google doc
https://developer.android.com/google/play/integrity/verdict#decrypt-verify-locally

1 developer blog
https://hoven.in/cpp-projects/play-integrity-api-2.html
https://hoven.in/cpp-projects/play-integrity-api-3.html

We are getting this "org.jose4j.lang.IntegrityException: A256KW key unwrap/decrypt failed" exception in below try catch block line.

"compactJws = jwe.payload"
// This is the code we are using for Play integrity

val str = "AIzaSyBPF4dLN4SLxNlraMWUD2FpUrfE39qvF_E"
val strBytes = Base64.decode(str, Base64.DEFAULT)
val encoded = Base64.encode( strBytes, Base64.URL_SAFE or Base64.NO_PADDING or Base64.NO_WRAP )
val nonce = String(encoded)
val DECRYPTION_KEY = "xcClpnhjH0JQrwcJ…./9TPiTqr34Nmqs="
val VERIFICATION_KEY = "MFkwEwYHKoZIzj0CAQYI….AEuzmUjHs7b7Z7NUgbKmq/5AJfpeMbjh/10yNlQllYlDz1DRIisRMbLI/4yDIO95VWgcfrrnSyIPKBMRFiFEZE3Q=="

val integrityManager = IntegrityManagerFactory.create(applicationContext)
val integrityTokenResponse = integrityManager.requestIntegrityToken(IntegrityTokenRequest.builder()
.setNonce(nonce)
.setCloudProjectNumber(70102…724)
.build()
)
.addOnSuccessListener(
(OnSuccessListener { response: IntegrityTokenResponse ->
val integrityToken = response.token()
val decryptionKeyBytes: ByteArray =
Base64.decode(DECRYPTION_KEY, Base64.DEFAULT)

        // SecretKey
        val decryptionKey: SecretKey =
            SecretKeySpec(decryptionKeyBytes, 0, decryptionKeyBytes.size, "AES")
        val encodedVerificationKey: ByteArray =
            Base64.decode(VERIFICATION_KEY, Base64.DEFAULT)

        // PublicKey
        var verificationKey: PublicKey? = null
        verificationKey = KeyFactory.getInstance("EC")
                .generatePublic(X509EncodedKeySpec(encodedVerificationKey))
        if (null == verificationKey) {
            return@OnSuccessListener
        }

        // JsonWebEncryption
        var jwe: JsonWebEncryption? = null
        jwe = JsonWebStructure.fromCompactSerialization(integrityToken) as JsonWebEncryption
        
        if (null == jwe) {
            return@OnSuccessListener
        }
        jwe.key = decryptionKey
        var compactJws: String? = null
        try {
            **compactJws = jwe.payload**	// We are getting exception on tis line
        } catch (e: JoseException) {
            Log.d(TAG, e.message!!)
        }

        // JsonWebSignature
        var jws: JsonWebSignature? = null
        try {
            if (compactJws != null) {
                jws = JsonWebStructure
                    .fromCompactSerialization(compactJws) as JsonWebSignature
            } else {
                Log.d(TAG, "Null compactJWS")
            }

        } catch (e: JoseException) {
            Log.d(TAG, e.message!!)
        }

        if (null == jws) {
            return@OnSuccessListener
        }
        jws.key = verificationKey

        // get the json human readable string
        var jsonPlainVerdict: String? = ""
        jsonPlainVerdict = try {
            jws.payload
        } catch (e: JoseException) {
            Log.d(TAG, e.message!!)
            return@OnSuccessListener
        }

        // payload is available in json format
        // plain text, can be processed as per needs
        Log.d(TAG, jsonPlainVerdict!!)
    } as OnSuccessListener<IntegrityTokenResponse>)!!
)
.addOnFailureListener((OnFailureListener { ex: Exception? ->
    Log.d(
        TAG,
        ex!!.message.toString()
    )
} as OnFailureListener)!!)

[dvsekhvalnov]

Hey @Jitendran ,

it doesn't look like the code that using jose-jwt lib? Not sure what i can comment about?

[Jitendran]

Hey @dvsekhvalnov , Thanks for your reply.
I am using below lib in my kotlin build.gradle file.

implementation 'com.google.android.play:integrity:1.1.0'
implementation group: 'org.bitbucket.b_c', name: 'jose4j', version: '0.7.12'

[dvsekhvalnov]

@Jitendran i got it :)

I can't comment on those ones, i can comment on jose-jwt project, but you not showing any code that using it.

[dishanphilips]

On C# I managed to solve it like mentioned here : #202

[Jitendran]

Thanks @dishanphilips for your reply.

[dvsekhvalnov]

If you guys good with your question, feel free to close ticket.

[KubinkiewiczDawid]

Hi @Jitendran, did u managed to fix it in ur app?

[Jitendran]

Hi @KubinkiewiczDawid , we was facing this issue before the app was not live when we live the app in Play store after that we are not facing this issue.