Oblivious HTTP Encapsulator

The library provides a simple Kotlin API for Android apps to encapsulate and decapsulate Oblivious HTTP requests to the Privacy Relay. The library represents an Android JNI wrapper for Cloudflare Privacy Gateway Client Library binaries.

Download

Declare Gradle dependencies

dependencies {
    implementation("com.github.flohealth:ohttp-encapsulator:0.1.0")
}

Download artifacts

You can download artifacts from GitHub Releases.

Usage

import health.flo.network.ohttp.encapsulator.ohttpEncapsulator

val serializedRequest: ByteArray // serialized request in format used by your app
val cryptoConfig: ByteArray // OHTTP crypto config obtained from your server

val encapsulator: OhttpEncapsulator = ohttpEncapsulator()
val encapsulationResult: EncapsulationResult = encapsulator.encapsulateRequest(
    serializedRequest,
    cryptoConfig,
)

when (encapsulationResult) {
    is EncapsulationResult.Failure -> {
        // handle error
    }
    is EncapsulationResult.Success -> {
        val encapsulatedRequest: ByteArray = encapsulationResult.data
        val decapsulator: OhttpDecapsulator = encapsulationResult.decapsulator

        // send encryptedRequest to relay server & get encrypted response from relay server
        val encapsulatedResponse: ByteArray // encrypted response from relay

        val decapsulationResult: DecapsulationResult = decapsulator.decapsulateResponse(encapsulatedResponse)
        when (decapsulationResult) {
            is DecapsulationResult.Failure -> {
                // handle error
            }
            DecapsulationResult.Disposed -> {
                // this could happen if you call decapsulateResponse second time. 
                // you should call decapsulateResponse only once.
            }
            is DecapsulationResult.Success -> {
                val decapsulatedSerializedResponse: ByteArray = decapsulationResult.data
                // deserialize decryptedResponse into used response format & use it
            }
        }
    }
}

License

Released under MIT License.