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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <jni.h>
#include <cstdint>
#include <optional>
#include <utility>
#include <vector>
#include "base/android/jni_array.h"
#include "base/android/scoped_java_ref.h"
#include "device/fido/attestation_object.h"
// Must come after all headers that specialize FromJniType() / ToJniType().
#include "components/webauthn/android/jni_headers/Fido2Api_jni.h"
using base::android::JavaByteArrayToByteVector;
using base::android::JavaParamRef;
using base::android::ScopedJavaLocalRef;
using base::android::ToJavaByteArray;
namespace webauthn {
// Parses a CTAP2 attestation[1] and extracts the
// parts that the browser provides via Javascript API [2]. Called
// Fido2Api.java when constructing the makeCredential reply.
//
// [1] https://www.w3.org/TR/webauthn/#attestation-object
// [2] https://w3c.github.io/webauthn/#sctn-public-key-easy
static jboolean JNI_Fido2Api_ParseAttestationObject(
JNIEnv* env,
const base::android::JavaParamRef<jbyteArray>& jattestation_object_bytes,
const base::android::JavaParamRef<jobject>& out_result) {
std::vector<uint8_t> attestation_object_bytes;
JavaByteArrayToByteVector(env, jattestation_object_bytes,
&attestation_object_bytes);
std::optional<device::AttestationObject::ResponseFields> fields =
device::AttestationObject::ParseForResponseFields(
std::move(attestation_object_bytes), /*attestation_acceptable=*/true);
if (!fields) {
return false;
}
ScopedJavaLocalRef<jbyteArray> spki_java;
if (fields->public_key_der) {
spki_java.Reset(ToJavaByteArray(env, *fields->public_key_der));
}
Java_AttestationObjectParts_setAll(
env, out_result, ToJavaByteArray(env, fields->authenticator_data),
spki_java, fields->public_key_algo,
ToJavaByteArray(env, fields->attestation_object_bytes));
return true;
}
} // namespace webauthn
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