this will help newbees also. just adding more details to @coder_For_Life22's answer. if this answer helps you don't forget to upvote. it motivates us. for this you must already know the path of the app's keystore file and password for this example consider the key is stored at "c:\keystorekey\new.jks" 1. open this page https://code.google.com/archive/p/openssl-for-windows/downloads 2. download 32 or 64 bit zip file as per your windows OS. 3. extract the downloaded file where ever you want and remember the path. 4. for this example we consider that you have extracted the folder in download folder. so the file address will be "C:\Users\0\Downloads\openssl-0.9.8e_X64\bin\openssl.exe"; 5. now on keyboard press windows+r button. 6. this will open run box. 7. type cmd and press Ctrl+Shift+Enter. 8. this will open command prompt as administrator. 9. here navigate to java's bin folder: if you use jre provided by Android Studio you will find the path as follows: a. open android studio. b. file->project structure c. in the left pane, click 'SDK location' d. in the right pane, below 'JDK location' is your jre path. e. add "\bin" at the end of this path as the file "keytool.exe", we need, is inside this folder. for this example i consider, you have installed java separately and following is the path "C:\Program Files\Java\jre-10.0.2\bin" if you have installed 32bit java it will be in "C:\Program Files (x86)\Java\jre-10.0.2\bin" 10. now with above paths execute command as following:

keytool -exportcert -alias androiddebugkey -keystore "c:\keystorekey\new.jks" | "C:\Users\0\Downloads\openssl-0.9.8e_X64\bin\openssl.exe" sha1 -binary |"C:\Users\0\Downloads\openssl-0.9.8e_X64\bin\openssl.exe" base64

您将被要求输入密码，请输入您在创建密钥存储库密钥时所提供的密码。 ! ! 这将给你钥匙

错误: 如果你得到: --- 'keytool'不能被识别为内部或外部命令 --- 这意味着Java安装在其他地方。

自从API 26以来，你可以在KOTLIN中使用以下代码生成你的HASH key，而不需要任何Facebook SDK。

fun generateSSHKey(context: Context){
    try {
        val info = context.packageManager.getPackageInfo(context.packageName, PackageManager.GET_SIGNATURES)
        for (signature in info.signatures) {
            val md = MessageDigest.getInstance("SHA")
            md.update(signature.toByteArray())
            val hashKey = String(Base64.getEncoder().encode(md.digest()))
            Log.i("AppLog", "key:$hashKey=")
        }
    } catch (e: Exception) {
        Log.e("AppLog", "error:", e)
    }

}

你可以用这个apk

1.first install the app from the Google play store
2.install the above apk
3.launch the apk and input the package name of your app
4.then you will get the hash code you want

很容易找到你的android项目的sha1

然后粘贴到这个网站上

对于get sha1只是

// vscode and my cmd
project-name/cd android && ./gradlew signingReport

// other 
project-name/cd android && ./gradlew signingReport

我也遇到了同样的问题，下面是我如何解决它的方法

keytool -list -alias androiddebugkey -keystore <project_file\android\app\debug.keystore>

简单的方法

通过使用这个网站，您可以通过将SHA1密钥转换为Facebook的哈希密钥来获得哈希密钥。