在Android中字符串加密 [英] String Encryption in Android
本文介绍了在Android中字符串加密的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我使用的是code加密和加密。它不给字符串结果。该字节数组不转换为字符串。我什么都试过几乎到了字节数组为char转换，但它不是给人造成的。
公共类EncryptionTest延伸活动{EditText上输入，输出，outputDecrypt;
串plain_text;
字节[]键，encrypted_bytes，keyStart，byte_char_text，decrpyted_bytes;@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_encryption_test）; 输入=（EditText上）findViewById（R.id.text_inputText）;
输出=（EditText上）findViewById（R.id.text_Result）;
outputDecrypt =（EditText上）findViewById（R.id.text_decrypt_Result）;
按钮encrypt_btn =（按钮）findViewById（R.id.btn_encrpyt）;
按钮decrypt_btn =（按钮）findViewById（R.id.btn_Decrypt）; plain_text = input.getText（）的toString（）。
keyStart =Supriyo.getBytes（）;
byte_char_text = plain_text.getBytes（）; encrypt_btn.setOnClickListener（新OnClickListener（）{ @覆盖
公共无效的onClick（视图v）{
尝试{ 的KeyGenerator凯基= KeyGenerator.getInstance（AES）;
SecureRandom的SR = SecureRandom.getInstance（SHA1PRNG）;
sr.setSeed（keyStart）;
keygen.init（128，SR）;
SecretKey的SKEY = keygen.generateKey（）;
关键= skey.getEn codeD（）; encrypted_bytes =加密（键，byte_char_text）;
串inputResult = encrypted_bytes.toString（）;
output.setText（inputResult）;
decrpyted_bytes =解密（键，encrypted_bytes）;
的System.out.println（DECR+ Arrays.toString（decrpyted_bytes））;
字符串outputResult =新的String（decrpyted_bytes，UTF-8）;
的System.out.println（ - ＆GT;＆GT;＆gt;中+ outputResult）;
outputDecrypt.setText（outputResult）; }赶上（抛出：NoSuchAlgorithmException E）{ e.printStackTrace（）;
}赶上（InvalidKeyException将E）{
// TODO自动生成catch块
e.printStackTrace（）;
}赶上（NoSuchPaddingException E）{
// TODO自动生成catch块
e.printStackTrace（）;
}赶上（IllegalBlockSizeException E）{
// TODO自动生成catch块
e.printStackTrace（）;
}赶上（BadPaddingException E）{
// TODO自动生成catch块
e.printStackTrace（）;
}赶上（例外五）{
// TODO自动生成catch块
e.printStackTrace（）;
} }
}）;
}公共静态的byte []解密（字节[]生，字节[] encrypteds）
抛出异常{ SecretKeySpec SKEY =新SecretKeySpec（生，AES）;
密密码= Cipher.getInstance（AES）;
cipher.init（Cipher.DECRYPT_MODE，SKEY）;
字节[]解密= cipher.doFinal（encrypteds）;
返回解密;
}公共静态的byte []加密（字节[]生，字节[]清）
抛出异常{ SecretKeySpec skeySpec =新SecretKeySpec（生，AES）;
密密码= Cipher.getInstance（AES）;
cipher.init（Cipher.ENCRYPT_MODE，skeySpec）;
字节的加密[] = cipher.doFinal（清晰）; 返回加密;
} @覆盖
公共布尔onCreateOptionsMenu（菜单菜单）{
//充气菜单;如果是present这增加了项目操作栏。
。getMenuInflater（）膨胀（R.menu.encryption_test，菜单）;
返回true;
} }
解决方案
在code被成功加密的字符串以及从资产产生文件夹中的XML文件。
进口java.io.BufferedReader中;
进口的java.io.File;
进口java.io.FileInputStream中;
进口java.io.FileOutputStream中;
进口java.io.FilterWriter中;
进口的java.io.InputStream;
进口java.io.InputStreamReader中; 进口javax.crypto.Cipher中;
进口javax.crypto.CipherInputStream中;
进口javax.crypto.KeyGenerator;
进口javax.crypto.SecretKey; 进口android.os.Bundle;
进口android.app.Activity;
进口android.view.Menu;
进口android.view.View;
进口android.view.View.OnClickListener;
进口android.widget.Button;
进口android.widget.EditText;
进口org.apache.commons codec.binary.Base64。 公共类EncryptionTest1延伸活动{
输出的EditText，outputDecrypt;
的EditText输入;
串plainData =;
串密文，decryptedText;
注册机的KeyGenerator;
SecretKey的SecretKey的;密码aesCipher;
FileOutputStream中FOS;字节[] byteDataToEncrypt，byteCipherText，byteDecryptedText;
字节[] xmlStream;@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_encryption_test1）;
输入=（EditText上）findViewById（R.id.text_inputText1）;
输出=（EditText上）findViewById（R.id.text_Result1）;
outputDecrypt =（EditText上）findViewById（R.id.text_decrypt_Result1）; 按钮btn_encrypt =（按钮）findViewById（R.id.btn_encrpyt1）; btn_encrypt.setOnClickListener（新OnClickListener（）{ @覆盖
公共无效的onClick（视图v）{ 尝试{
plainData = input.getText（）的toString（）。
的System.out.println（输入==＆GT;＆gt;中+ plainData）;
字节[] =文件流fileOpening（SaleReport.xml）;
字节[] = DataEncrypt加密（文件流）;
字符串DataDecrypt =解密（DataEncrypt）; 的System.out.println（解密文本：===＆GT;＆gt;中+ DataDecrypt）;
outputDecrypt.setText（DataDecrypt）;
}赶上（例外五）{
e.printStackTrace（）;
}
} }）;
}私人字节[] fileOpening（字符串文件名）抛出异常{
InputStream为= getAssets（）打开（文件名）。
INT大小= is.available（）;
xmlStream =新的字节[大小]
is.read（xmlStream）;
的System.out.println（xmlstream长度==＆GT;＆gt;中+ xmlStream.length）;
返回xmlStream;
}私人字节[]加密（字节[] xmlStream）抛出异常{ 凯基= KeyGenerator.getInstance（AES）;
keyGen.init（128）;
SecretKey的= keyGen.generateKey（）;
aesCipher = Cipher.getInstance（AES）;
aesCipher.init（Cipher.ENCRYPT_MODE，SecretKey的）;
// byteDataToEncrypt = plainData.getBytes（）; byteCipherText = aesCipher.doFinal（xmlStream）;
密文=新的String（新的Base64（）带codeBase64（byteCipherText））;
output.setText（密文）;
的System.out.println（密文）; 返回byteCipherText;}公共字符串解密（字节[] DataEncrypt）抛出异常{
aesCipher.init（Cipher.DECRYPT_MODE，SecretKey的，
aesCipher.getParameters（））;
byteDecryptedText = aesCipher.doFinal（DataEncrypt）;
decryptedText =新的String（byteDecryptedText）;
返回decryptedText;
}@覆盖
公共布尔onCreateOptionsMenu（菜单菜单）{
//充气菜单;如果是present这增加了项目操作栏。
。getMenuInflater（）膨胀（R.menu.encryption_test1，菜单）;
返回true;
} }
I am using the code for encryption and encryption. Its not giving the string result. The byte array is not converting to string. I tried everything almost to convert the byte array to char but its not giving the result.
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;
}
}
解决方案
The Code is successfully Encrypting the String As well as the Xml file from the assests folder.
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;
}
}
这篇关于在Android中字符串加密的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
