[英]Unable to retrieve Private Key from KeyStore
I am trying to make an Chat app which uses RSA algorithm for encryption. 我正在尝试制作一个使用RSA算法进行加密的聊天应用程序。 After But when I try to decrypt messages I am getting this error below. 之后但是,当我尝试解密消息时,下面出现此错误。
Here is how I am creating keys; 这是我创建密钥的方式;
if (!keyStore.containsAlias(alias)) {
Calendar start = Calendar.getInstance();
Calendar end = Calendar.getInstance();
end.add(Calendar.YEAR, 25);
KeyPairGeneratorSpec spec = new KeyPairGeneratorSpec.Builder(getApplicationContext())
.setAlias(alias)
.setSubject(new X500Principal("CN=Sample Name, O=Android Authority"))
.setSerialNumber(BigInteger.ONE)
.setStartDate(start.getTime())
.setEndDate(end.getTime())
.build();
KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", "AndroidKeyStore");
generator.initialize(spec);
}
And here is how I tryed to decrypt messages; 这就是我尝试解密消息的方式。
Definition the KeyStore; 定义密钥库;
static KeyStore keyStore;
Loading keyStore in onCreate method: 在onCreate方法中加载keyStore:
try{
keyStore = KeyStore.getInstance("AndroidKeyStore");
keyStore.load(null);
}
catch (CertificateException | NoSuchAlgorithmException | KeyStoreException | IOException e) {
e.printStackTrace();
}
Decrypt Function: 解密功能:
public String decryptString(String alias, String decrypted) {
try {
KeyStore.Entry entry;
//ERROR HAPPENS HERE.
entry = keyStore.getEntry(alias, null);
KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry) entry;
Cipher output = Cipher.getInstance("RSA/ECB/PKCS1Padding");
output.init(Cipher.DECRYPT_MODE, privateKeyEntry.getPrivateKey());
CipherInputStream cipherInputStream = new CipherInputStream(
new ByteArrayInputStream(Base64.decode(decrypted, Base64.DEFAULT)), output);
ArrayList<Byte> values = new ArrayList<>();
int nextByte;
while ((nextByte = cipherInputStream.read()) != -1) {
values.add((byte) nextByte);
}
byte[] bytes = new byte[values.size()];
for (int i = 0; i < bytes.length; i++) {
bytes[i] = values.get(i);
}
String finalText = new String(bytes, 0, bytes.length, "UTF-8");
return finalText;
} catch (IOException | KeyStoreException | NoSuchPaddingException | UnrecoverableEntryException | InvalidKeyException | NoSuchAlgorithmException e) {
e.printStackTrace();
}
return "Error";
}
I am getting this error below; 我在下面收到此错误;
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.furkan.profil, PID: 10591
java.lang.NullPointerException: Attempt to invoke virtual method 'java.security.KeyStore$Entry java.security.KeyStore.getEntry(java.lang.String, java.security.KeyStore$ProtectionParameter)' on a null object reference
at com.furkan.profil.RSAHelper.decryptString(RSAHelper.java:180)
at com.furkan.profil.Chat.ChatActivity$4.onChildAdded(ChatActivity.java:251)
at com.google.android.gms.internal.zzblz.zza(Unknown Source)
at com.google.android.gms.internal.zzbnz.zzYj(Unknown Source)
at com.google.android.gms.internal.zzboc$1.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
I've just noticed that I am accessing this method from another activity and this I am not triggering onCreate() method when I try to access method. 我刚刚注意到我正在从另一个活动访问此方法,并且在尝试访问该方法时并未触发onCreate()方法。 I added; 我加了;
try{
keyStore = KeyStore.getInstance("AndroidKeyStore");
keyStore.load(null);
} catch (CertificateException | NoSuchAlgorithmException | KeyStoreException | IOException e) {
throw new IllegalStateException("KeyStore could not be initialized", e);
}
lines to decryptString() method. 线指向cryptoString()方法。 After that my problems are solved. 之后,我的问题解决了。
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