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Update sample application to show how to use the new Evervault provider to source PCRs #53

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Update sample application to show how to use the new Evervault provider to source PCRs #53

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9536c3c
chore: update sample application to show how to use the new Evervault…
lfarrel6 Jan 24, 2024
a58a32a
Update build config to use Enclave name
lfarrel6 Jan 24, 2024
8eaf701
update datatype name to match docs
lfarrel6 Jan 25, 2024
1e99463
Merge branch 'main' into liam/update-sample-app-to-use-evervault-prov…
matt-evervault Jan 7, 2026
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1 change: 1 addition & 0 deletions sampleapplication/build.gradle.kts
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@ android {
buildConfigField("String", "EV_APP_UUID", "\"$evAppId\"")
buildConfigField("String", "MERCHANT_ID", "\"$evervaultMerchantId\"")
buildConfigField("String", "PCR_CALLBACK_URL", "\"$evervaultPcrCallbackUrl\"")
buildConfigField("String", "ENCLAVE_NAME", "\"hello-enclave\"")
buildConfigField("String", "ENCLAVE_URL", "\"$evervaultEnclaveUrl\"")
}

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96 changes: 63 additions & 33 deletions sampleapplication/src/main/java/com/evervault/sampleapplication/ui/views/EnclaveView.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -32,13 +32,17 @@ import java.io.IOException
@OptIn(ExperimentalComposeUiApi::class)
@Composable
fun EnclaveView() {

val enclaveName = BuildConfig.ENCLAVE_NAME
val appUuid = BuildConfig.APP_UUID

var cachedCallResponseText: String? by remember { mutableStateOf(null) }
var staticPCRCallResponseText: String? by remember { mutableStateOf(null) }

LaunchedEffect(Unit) {
withContext(Dispatchers.IO) {
staticPCRCallResponseText = EvervaultHttpClient.staticPCRsEnclaveRequest()
cachedCallResponseText = EvervaultHttpClient.cachedPCRsEnclaveRequest()
staticPCRCallResponseText = staticPCRsEnclaveRequest(enclaveName, appUuid)
cachedCallResponseText = cacheManagerEnclaveCall(enclaveName, appUuid)
}
}

Expand All @@ -60,34 +64,18 @@ fun EnclaveView() {
}
}

object EvervaultHttpClient {
private var client: OkHttpClient? = null
private const val enclaveURL = BuildConfig.ENCLAVE_URL
private const val enclaveName = BuildConfig.ENCLAVE_UUID
private const val appUuid = BuildConfig.EV_APP_UUID
@Synchronized
private fun getClient(pcrCallback: PcrCallback? = null): OkHttpClient {
return client ?: OkHttpClient.Builder()
.enclavesTrustManager(
if (pcrCallback != null) {
AttestationData(enclaveName, pcrCallback)
} else {
AttestationData(
enclaveName,
PCRs(
pcr0 = "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
pcr1 = "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
pcr2 = "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
pcr8 = "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
)
)
},
appUuid,
enclaveURL
)
.build()
.also { client = it }
}
// Data type to mirror the Evervault API response shape from the Enclave attestation info endpoint.
data class PCRContainer(
val data: List<PCRs>
)

fun cacheManagerEnclaveCall(enclaveName: String, appUuid: String): String {
val url = "https://$enclaveName.$appUuid.enclave.evervault.com/compute"
val pcrClient = OkHttpClient.Builder().build()
val pcrRequest = Request.Builder()
.url(BuildConfig.PCR_CALLBACK_URL)
.header("x-evervault-app-id", appUuid.replace("-","_"))
.build()

fun staticPCRsEnclaveRequest(): String {
val request = Request.Builder()
Expand All @@ -113,9 +101,9 @@ object EvervaultHttpClient {

val pcrCallback: PcrCallback = {
val pcrResponse = pcrClient.newCall(pcrRequest).execute()
val type = object : TypeToken<List<PCRs>>() {}.type
val responseMap: List<PCRs> = Gson().fromJson(pcrResponse.body!!.string(), type)
responseMap
val type = object : TypeToken<PCRContainer>() {}.type
val responseMap: PCRContainer = Gson().fromJson(pcrResponse.body!!.string(), type)
responseMap.data
}

val request = Request.Builder()
Expand All @@ -134,3 +122,45 @@ object EvervaultHttpClient {
}
}

fun staticPCRsEnclaveRequest(enclaveName: String, appUuid: String): String {
val url = "https://$enclaveName.$appUuid.enclave.evervault.com/compute"

val jsonPayload = JSONObject()
jsonPayload.put("a", 1)
jsonPayload.put("b", 2)

val requestBody = RequestBody.create(
"application/json; charset=utf-8".toMediaTypeOrNull(),
jsonPayload.toString()
)

val client = OkHttpClient.Builder()
.enclavesTrustManager(
AttestationData(
enclaveName = enclaveName,
// Replace with legitimate PCR strings when not in debug mode
PCRs(
pcr0 = "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
pcr1 = "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
pcr2 = "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
pcr8 = "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
)
),
appUuid
)
.build()

val request = Request.Builder()
.url(url)
.post(requestBody)
.build()

return try {
val response = client.newCall(request).execute()
val responseMap: Map<String, String> = Gson().fromJson(response.body!!.string(), Map::class.java) as Map<String, String>
responseMap["sum"].toString()
} catch (e: IOException) {
e.printStackTrace()
"Error: ${e.message}"
}
}
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