keytool -exportcert -alias androiddebugkey -keystore       C:\Users\pravin\.android\debug.keystore | "H:\OpenSSL\bin\openssl" sha1 -binary | "H:\OpenSSL\bin\openssl" base64

这对我很管用……

步骤:

1) Open command line go to - > java Keytool..... for me C:\Program Files\Java\JDK1.7\bin
2) Download OpenSSL from google
3) paste this with changing your paths -
   keytool -exportcert -alias androiddebugkey -keystore C:\Users\pravin\.android\debug.keystore | "H:\OpenSSL\bin\openssl" sha1 -binary | "H:\OpenSSL\bin\openssl" base64 

    ....................   give proper debug.keystore path and openSSL path .. 

4) Finley it may be ask u password .. so give password -> android   ...
5) you will get 28 characters that will be your has key

facebook开发者网站上的官方文件:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Add code to print out the key hash
    try {
        PackageInfo info = getPackageManager().getPackageInfo(
                "com.facebook.samples.hellofacebook", 
                PackageManager.GET_SIGNATURES);
        for (Signature signature : info.signatures) {
            MessageDigest md = MessageDigest.getInstance("SHA");
            md.update(signature.toByteArray());
            Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
            }
    } catch (NameNotFoundException e) {

    } catch (NoSuchAlgorithmException e) {

    }

这是Facebook官方页面上给出的内容:

   keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore | openssl sha1 -binary | openssl base64

让我把这个命令分解成几个片段。

Look for "keytool.exe". You can search that on the C: drive. You can find it in "java jdk" or "java jre". If you have installed multiple versions, choose any. Open a CMD prompt and go to the above directory where you found "keytool.exe". Clip the "exe`" and paste the above command provided on the Facebook page. You will get an error on entering this that OpenSSL is not recognized as in input output command. Solution : Download "Openssl" from OpenSSL (if you have a 64-bit machine you must download openssl-0.9.8e X64). Extract and save it anywhere... I saved it on the C: drive in the OpenSSl folder Replace the openssl in the above command in which you was getting an error of OpenSSL with "C:\OpenSSL\bin\openssl" at both the places after the pipe, "|". If prompted for a password, enter android.

你会得到你的哈希键。要了解进一步的步骤，请再次参考Facebook页面。

目前Facebook Android教程中的说明在Windows下并不适用。他们的例子展示了如何将keytool输出输出到openssl，但是如果你在Windows下尝试这样做，由于某些原因输出是无效的。我发现我必须使用中间文件才能让它正常工作。以下是对我有用的步骤:

首先从谷歌下载openssl for Windows。

C:\Users\Me>keytool -exportcert -alias my_key -keystore my.keystore -storepass PASSWORD > mycert.bin

C:\Users\Me>openssl sha1 -binary mycert.bin > sha1.bin

C:\Users\Me>openssl base64 -in sha1.bin -out base64.txt

运行这些命令后，有效的散列存储在文件base64.txt中。复制粘贴到你的Facebook应用设置中。

对于Android应用程序

这段代码用于在Android应用程序中获取Facebook集成的哈希键。我已经测试了所有的设备，一切正常。只更改此代码的包名:

private void facebookHashKey() {

    try {
        PackageInfo info = getPackageManager().getPackageInfo("com.app.helpcove", PackageManager.GET_SIGNATURES);
        for (Signature signature : info.signatures) {
            MessageDigest md = MessageDigest.getInstance("SHA");
            md.update(signature.toByteArray());
            String hashCode  = Base64.encodeToString(md.digest(), Base64.DEFAULT);
            System.out.println("Print the hashKey for Facebook :"+hashCode);
            Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
        }
    } catch (NameNotFoundException e) {

    } catch (NoSuchAlgorithmException e) {

    }
}

在Android Studio中也解决了我的问题，但方法略有不同。

在Android Studio中获取SHA-1值。

点击它 点击签署报告 sha - 1副本

SHA-1值是这样的 CD: A1: EA: A3:5C: 5 c: 68: FB:费尔南多-阿隆索:0:6 b: E5:5A: 72:64: DD: 26:8D: 44:84 打开http://tomeko.net/online_tools/hex_to_base64.php进行转换 你的SHA1值到base64。这就是Facebook所要求的 生成的哈希 " ********************= " 并复制关键散列 facebook应用程序控制台。

部分答案来自Github链接