credentials/credentials/src/main/java/androidx/credentials/webauthn/WebAuthnUtilsApi28.kt

/*
 * Copyright 2023 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package androidx.credentials.webauthn

import androidx.annotation.RequiresApi
import androidx.annotation.RestrictTo
import androidx.credentials.provider.CallingAppInfo
import java.security.MessageDigest

@RestrictTo(RestrictTo.Scope.LIBRARY)
@RequiresApi(28)
internal class WebAuthnUtilsApi28 {
    companion object {
        fun appInfoToOrigin(info: CallingAppInfo): String {
            val cert = info.signingInfo.apkContentsSigners[0].toByteArray()
            val md = MessageDigest.getInstance("SHA-256")
            val certHash = md.digest(cert)
            return "android:apk-key-hash:${WebAuthnUtils.b64Encode(certHash)}"
        }
    }
}