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Error: 0D0680A8: asn1 encoding routine: ASN1_CHECK_TLEN: invalid tag when importing RSA public key

I created an RSA key pair (public and private). Now for testing, I'm trying to import the public key into the view Stringin PublicKey, to use it in an Android project, to send encrypted messages in RSA to a remote server, which subsequently decrypts them using the private key.

public static String encryptDataRSA(final String data) throws IOException {  
  final byte[] dataToEncrypt = data.getBytes();
  byte[] encryptedData = null;  

  try {
    final String keyStr = "-----BEGIN PUBLIC KEY-----\n" +
                            "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDdQudusozLmogBfU2LCO+WcM59\n" +
                            "ycup9SxMsBNCku23PxrPMO6u//QjtWPz7istE9vkQfa6tQn1Or+SDxeHLMxEesF0\n" +
                            "xiBEgFUhg7vjOF2SnFQQEADgUyizUIBBn1UgKNA8eP24Ux0P0M2aHMn78HIHsRcu\n" +
                            "pNGUNW7p51HOVoIPJQIDAQAB\n" +
                            "-----END PUBLIC KEY-----";

    PublicKey publicKey = KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(keyStr.getBytes()));

    final Cipher cipher = Cipher.getInstance("RSA");  
    cipher.init(Cipher.ENCRYPT_MODE, publicKey);  
    encryptedData = cipher.doFinal(dataToEncrypt); 

    try {
      final String encryptedText = new String(Base64.encode(encryptedData, Base64.DEFAULT), "UTF-8");
      return encryptedText.toString();
    } 
    catch (final UnsupportedEncodingException e1) { return null; }      
  } catch (Exception e) { e.printStackTrace(); }     

  return "ERROR";
}

The problem is that this returns the following exception:

03-19 21:14:31.449: W/System.err(2713): java.security.spec.InvalidKeySpecException: java.lang.RuntimeException: error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag
03-19 21:14:31.480: W/System.err(2713):     at org.apache.harmony.xnet.provider.jsse.OpenSSLKey.getPublicKey(OpenSSLKey.java:89)
03-19 21:14:31.480: W/System.err(2713):     at org.apache.harmony.xnet.provider.jsse.OpenSSLRSAKeyFactory.engineGeneratePublic(OpenSSLRSAKeyFactory.java:47)
03-19 21:14:31.489: W/System.err(2713):     at java.security.KeyFactory.generatePublic(KeyFactory.java:171)
03-19 21:14:31.489: W/System.err(2713):     at com.mydomain.myproject.SecurityTools.encryptDataRSA(SecurityTools.java:85)
03-19 21:14:31.501: W/System.err(2713):     at com.mydomain.myproject.MainActivity.onCreate(MainActivity.java:93)
03-19 21:14:31.501: W/System.err(2713):     at android.app.Activity.performCreate(Activity.java:5133)
03-19 21:14:31.509: W/System.err(2713):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-19 21:14:31.521: W/System.err(2713):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
03-19 21:14:31.521: W/System.err(2713):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
03-19 21:14:31.529: W/System.err(2713):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
03-19 21:14:31.529: W/System.err(2713):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
03-19 21:14:31.541: W/System.err(2713):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-19 21:14:31.541: W/System.err(2713):     at android.os.Looper.loop(Looper.java:137)
03-19 21:14:31.561: W/System.err(2713):     at android.app.ActivityThread.main(ActivityThread.java:5103)
03-19 21:14:31.571: W/System.err(2713):     at java.lang.reflect.Method.invokeNative(Native Method)
03-19 21:14:31.581: W/System.err(2713):     at java.lang.reflect.Method.invoke(Method.java:525)
03-19 21:14:31.592: W/System.err(2713):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
03-19 21:14:31.601: W/System.err(2713):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
03-19 21:14:31.609: W/System.err(2713):     at dalvik.system.NativeStart.main(Native Method)
03-19 21:14:31.621: W/System.err(2713): Caused by: java.lang.RuntimeException: error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag
03-19 21:14:31.649: W/System.err(2713):     at org.apache.harmony.xnet.provider.jsse.NativeCrypto.d2i_PUBKEY(Native Method)
03-19 21:14:31.649: W/System.err(2713):     at org.apache.harmony.xnet.provider.jsse.OpenSSLKey.getPublicKey(OpenSSLKey.java:87)
03-19 21:14:31.663: W/System.err(2713):     ... 18 more

The exception points to this line: cipher.init(Cipher.ENCRYPT_MODE, publicKey);

Why does this return this exception and how to solve it? Thank.

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2 answers

X509EncodedKeySpec DER- , PEM-. , "BEGIN" "END" base64-decode .

final String key2 = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDdQudusozLmogBfU2LCO+WcM59"
    + "ycup9SxMsBNCku23PxrPMO6u//QjtWPz7istE9vkQfa6tQn1Or+SDxeHLMxEesF0"
    + "xiBEgFUhg7vjOF2SnFQQEADgUyizUIBBn1UgKNA8eP24Ux0P0M2aHMn78HIHsRcu"
    + "pNGUNW7p51HOVoIPJQIDAQAB";

PublicKey publicKey = KeyFactory.getInstance("RSA").generatePublic(
    new X509EncodedKeySpec(DatatypeConverter.parseBase64Binary(key2)));
+17

, - :

CertificateFactory factory = CertificateFactory.getInstance("X.509");
try {           
       X509Certificate cer = (X509Certificate) factory.generateCertificate(inputStream);
       publicKey = cer.getPublicKey();
       inputStream.close();
} catch (IOException e) {
       e.printStackTrace();
}

. ----- BEGIN CERTIFICATE ----

+1

Source: https://habr.com/ru/post/1532562/

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