Android中的字符串加密

我正在使用代码进行加密和加密。 它没有给出字符串结果。 字节数组未转换为字符串。 我尝试了一切几乎将字节数组转换为char但它没有给出结果。

public class EncryptionTest extends Activity { EditText input, output, outputDecrypt; String plain_text; byte[] key, encrypted_bytes,keyStart,byte_char_text,decrpyted_bytes ; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_encryption_test); input = (EditText) findViewById(R.id.text_inputText); output = (EditText) findViewById(R.id.text_Result); outputDecrypt = (EditText) findViewById(R.id.text_decrypt_Result); Button encrypt_btn = (Button) findViewById(R.id.btn_encrpyt); Button decrypt_btn = (Button) findViewById(R.id.btn_Decrypt); plain_text = input.getText().toString(); keyStart = "Supriyo".getBytes(); byte_char_text = plain_text.getBytes(); encrypt_btn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { try { KeyGenerator keygen = KeyGenerator.getInstance("AES"); SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); sr.setSeed(keyStart); keygen.init(128, sr); SecretKey skey = keygen.generateKey(); key = skey.getEncoded(); encrypted_bytes = encrypt(key, byte_char_text); String inputResult = encrypted_bytes.toString(); output.setText(inputResult); decrpyted_bytes = decrypt(key, encrypted_bytes); System.out.println("decr"+Arrays.toString(decrpyted_bytes)); String outputResult = new String(decrpyted_bytes,"UTF-8"); System.out.println("-->>>"+outputResult); outputDecrypt.setText(outputResult); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (InvalidKeyException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (NoSuchPaddingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalBlockSizeException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (BadPaddingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); } public static byte[] decrypt(byte[] raw, byte[] encrypteds) throws Exception { SecretKeySpec skey = new SecretKeySpec(raw, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.DECRYPT_MODE, skey); byte[] decrypted = cipher.doFinal(encrypteds); return decrypted; } public static byte[] encrypt(byte[] raw, byte[] clear) throws Exception{ SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, skeySpec); byte encrypted[] = cipher.doFinal(clear); return encrypted; } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.encryption_test, menu); return true; } } 

Answer 1

代码成功加密字符串以及assests文件夹中的Xml文件。

  import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.FilterWriter; import java.io.InputStream; import java.io.InputStreamReader; import javax.crypto.Cipher; import javax.crypto.CipherInputStream; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import org.apache.commons.codec.binary.Base64; public class EncryptionTest1 extends Activity { EditText output, outputDecrypt; EditText input; String plainData = ""; String cipherText, decryptedText; KeyGenerator keyGen; SecretKey secretKey; Cipher aesCipher; FileOutputStream fos; byte[] byteDataToEncrypt, byteCipherText, byteDecryptedText; byte[] xmlStream; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_encryption_test1); input = (EditText) findViewById(R.id.text_inputText1); output = (EditText) findViewById(R.id.text_Result1); outputDecrypt = (EditText) findViewById(R.id.text_decrypt_Result1); Button btn_encrypt = (Button) findViewById(R.id.btn_encrpyt1); btn_encrypt.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { try { plainData = input.getText().toString(); System.out.println("input==>>" + plainData); byte[] fileStreams = fileOpening("SaleReport.xml"); byte[] DataEncrypt = encrypt(fileStreams); String DataDecrypt = decrypt(DataEncrypt); System.out.println("Decrypted Text:===>>" + DataDecrypt); outputDecrypt.setText(DataDecrypt); } catch (Exception e) { e.printStackTrace(); } } }); } private byte[] fileOpening(String fileName) throws Exception { InputStream is = getAssets().open(fileName); int size = is.available(); xmlStream = new byte[size]; is.read(xmlStream); System.out.println("xmlstream length==>>" + xmlStream.length); return xmlStream; } private byte[] encrypt(byte[] xmlStream) throws Exception { keyGen = KeyGenerator.getInstance("AES"); keyGen.init(128); secretKey = keyGen.generateKey(); aesCipher = Cipher.getInstance("AES"); aesCipher.init(Cipher.ENCRYPT_MODE, secretKey); // byteDataToEncrypt = plainData.getBytes(); byteCipherText = aesCipher.doFinal(xmlStream); cipherText = new String(new Base64().encodeBase64(byteCipherText)); output.setText(cipherText); System.out.println(cipherText); return byteCipherText; } public String decrypt(byte[] DataEncrypt) throws Exception { aesCipher.init(Cipher.DECRYPT_MODE, secretKey, aesCipher.getParameters()); byteDecryptedText = aesCipher.doFinal(DataEncrypt); decryptedText = new String(byteDecryptedText); return decryptedText; } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.encryption_test1, menu); return true; } } 

Answer 2

问题是plain_text总是等于"" ，因为你在onCreate初始化它，因此你的EditText在那一刻是空的。

在onClick方法中移动它：

 plain_text = input.getText().toString(); byte_char_text = plain_text.getBytes(); 

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另外正如评论中指出的那样：

1. System.out.println("decryption-->>" + decrpyted_bytes); 不会给你很多关于你的数组内容的信息。 因此，使用Arrays.toString查看其内容。
2. new String(bytes[])用于使用decrpyted_bytes数组创建String ，以查看加密/解密是否有效。