PrintKeyHash

printKeyHashForFacebookSDKlogin.kt

   fun printKeyHash(context: Activity): String? {
        val packageInfo: PackageInfo
        var key: String? = null
        try {
             //getting application package name, as defined in manifest
            val packageName = context.applicationContext.packageName

            //Retriving package info
            packageInfo = context.packageManager.getPackageInfo(packageName,
                    PackageManager.GET_SIGNATURES)
            Log.e("Package Name=", context.applicationContext.packageName)
            for (signature in packageInfo.signatures) {
                val md: MessageDigest = MessageDigest.getInstance("SHA")
                md.update(signature.toByteArray())
                key = String(Base64.encode(md.digest(), 0))
            }
        } catch (e1: PackageManager.NameNotFoundException) {
            Log.e("Name not found", e1.toString())
        } catch (e: NoSuchAlgorithmException) {
            Log.e("No such an algorithm", e.toString())
        } catch (e: Exception) {
            Log.e("Exception", e.toString())
        }
        return key
    }