Java 未找到带有RSA实现的Android GAE密钥工厂SHA1

我正在尝试用我的Android 4.4.2手机处理一个pub密钥，并用它验证签名。我使用谷歌应用程序引擎。请参阅下面我的系统错误和代码。谢谢你的帮助

11-25 18:30:00.271: W/System.err(11042): java.security.NoSuchAlgorithmException: KeyFactory SHA1withRSA implementation not found
11-25 18:30:00.271: W/System.err(11042):    at org.apache.harmony.security.fortress.Engine.notFound(Engine.java:177)
11-25 18:30:00.271: W/System.err(11042):    at org.apache.harmony.security.fortress.Engine.getInstance(Engine.java:151)
11-25 18:30:00.271: W/System.err(11042):    at java.security.KeyFactory.getInstance(KeyFactory.java:81)
11-25 18:30:00.271: W/System.err(11042):    at com.sample.activities.MainActivity$Task.onPostExecute(MainActivity.java:1304)
11-25 18:30:00.276: W/System.err(11042):    at com.sample.activities.MainActivity$Task.onPostExecute(MainActivity.java:1)
11-25 18:30:00.276: W/System.err(11042):    at android.os.AsyncTask.finish(AsyncTask.java:632)
11-25 18:30:00.276: W/System.err(11042):    at android.os.AsyncTask.access$600(AsyncTask.java:177)
11-25 18:30:00.276: W/System.err(11042):    at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
11-25 18:30:00.276: W/System.err(11042):    at android.os.Handler.dispatchMessage(Handler.java:102)
11-25 18:30:00.276: W/System.err(11042):    at android.os.Looper.loop(Looper.java:146)
11-25 18:30:00.276: W/System.err(11042):    at android.app.ActivityThread.main(ActivityThread.java:5602)
11-25 18:30:00.276: W/System.err(11042):    at java.lang.reflect.Method.invokeNative(Native Method)
11-25 18:30:00.276: W/System.err(11042):    at java.lang.reflect.Method.invoke(Method.java:515)
11-25 18:30:00.276: W/System.err(11042):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
11-25 18:30:00.276: W/System.err(11042):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
11-25 18:30:00.276: W/System.err(11042):    at dalvik.system.NativeStart.main(Native Method)

代码：

---

使用

密钥工厂

仅使用

的“RSA”

而不是

的“SHA1withRSA”

。哈希是签名算法的一部分，但密钥不是签名算法的专用密钥

编辑：这是签名算法的另一种方法，所以你可能只是切换了这两种方法

请注意，在使用公钥进行签名验证之前，您需要信任公钥。

try {

                X509EncodedKeySpec pubKeySpec = new X509EncodedKeySpec(
                        serverPubKey);
                // Now you need a KeyFactory object to do the conversion. That
                // object must be one that works with RSA keys.

                KeyFactory keyFactory = KeyFactory.getInstance("SHA1withRSA");
                // Finally, you can use the KeyFactory object to generate a
                // PublicKey from the key specification.

                PublicKey pubKey = keyFactory.generatePublic(pubKeySpec);

                Signature sig = Signature.getInstance("RSA");
                sig.initVerify(pubKey);
                boolean verifies = sig.verify(dataSignature);

                System.out.println("signature verifies: " + verifies);

        } catch (InvalidKeyException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvalidKeySpecException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SignatureException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }