Android key hash 구하기

override fun onCreate(savedInstanceState: Bundle?) { 
	super.onCreate(savedInstanceState) 
	setContentView(R.layout.activity_main) 
	try { 
		val info = packageManager.getPackageInfo(packageName, PackageManager.GET_SIGNING_CERTIFICATES) 
		val signatures = info.signingInfo.apkContentsSigners 
		val md = MessageDigest.getInstance("SHA") 
		for (signature in signatures) 
			{ 
              val md: MessageDigest 
              md = MessageDigest.getInstance("SHA") 
              md.update(signature.toByteArray()) 
              val key = String(Base64.encode(md.digest(), 0)) 
      		} 
      } 
catch(e: Exception) { Log.e("name not found", e.toString()) }}