我是Android的新手,我正在嘗試實現SMS Retriever API,以便在我的應用中使用OTP.

不幸的是,我陷入了“計算你的應用程序的哈希字符串”的部分

我在這里引用了指南部分,并在每個部分下面 – 我的問題：

>將您的應用程序的公鑰證書作為小寫十六進制字符串.例如,要從密鑰庫中獲取十六進制字符串,請鍵入以下命令

keytool -alias MyAndroidKey -exportcert -keystore MyProduction.keystore | xxd -p | tr -d "[:space:]"

我在哪里可以找到我的“公鑰證書”,我應該在哪里運行此命令？

>計算組合字符串的SHA-256總和.

什么是SHA-256,計算它意味著什么？

> Base64-編碼SHA-256總和的二進制值.您可能需要首先從其輸出格式解碼SHA-256和.

無法理解,我應該在這做什么？

解決方法:

import android.content.Context;

import android.content.ContextWrapper;

import android.content.pm.PackageManager;

import android.content.pm.Signature;

import android.os.Build;

import android.util.Base64;

import android.util.Log;

import java.nio.charset.StandardCharsets;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import java.util.ArrayList;

import java.util.Arrays;

/*

This is a helper class to generate your message hash to be included in your SMS message.

Without the correct hash, your app won't recieve the message callback. This only needs to be

generated once per app and stored. Then you can remove this helper class from your code.

*/

public class AppSignatureHelper extends ContextWrapper {

public static final String TAG = AppSignatureHelper.class.getSimpleName();

private static final String HASH_TYPE = "SHA-256";

public static final int NUM_HASHED_BYTES = 9;

public static final int NUM_BASE64_CHAR = 11;

public AppSignatureHelper(Context context) {

super(context);

getAppSignatures();

}

/**

* Get all the app signatures for the current package

* @return

*/

public ArrayList getAppSignatures() {

ArrayList appCodes = new ArrayList<>();

try {

// Get all package signatures for the current package

String packageName = getPackageName();

PackageManager packageManager = getPackageManager();

Signature[] signatures = packageManager.getPackageInfo(packageName,

PackageManager.GET_SIGNATURES).signatures;

// For each signature create a compatible hash

for (Signature signature : signatures) {

String hash = hash(packageName, signature.toCharsString());

if (hash != null) {

appCodes.add(String.format("%s", hash));

}

Log.d(TAG, "Hash " + hash);

}

} catch (PackageManager.NameNotFoundException e) {

Log.e(TAG, "Unable to find package to obtain hash.", e);

}

return appCodes;

}

private static String hash(String packageName, String signature) {

String appInfo = packageName + " " + signature;

try {

MessageDigest messageDigest = MessageDigest.getInstance(HASH_TYPE);

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {

messageDigest.update(appInfo.getBytes(StandardCharsets.UTF_8));

}

byte[] hashSignature = messageDigest.digest();

// truncated into NUM_HASHED_BYTES

hashSignature = Arrays.copyOfRange(hashSignature, 0, NUM_HASHED_BYTES);

// encode into Base64

String base64Hash = Base64.encodeToString(hashSignature, Base64.NO_PADDING | Base64.NO_WRAP);

base64Hash = base64Hash.substring(0, NUM_BASE64_CHAR);

Log.d(TAG, String.format("pkg: %s -- hash: %s", packageName, base64Hash));

return base64Hash;

} catch (NoSuchAlgorithmException e) {

Log.e(TAG, "hash:NoSuchAlgorithm", e);

}

return null;

}

}

在項目中添加上面的類,然后從LoginActivity中調用它,如下所示

AppSignatureHelper appSignatureHelper = new AppSignatureHelper(LoginActivity.this);然后你會得到11位哈希

標簽：android

來源： https://codeday.me/bug/20190731/1586098.html

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