Android(安卓)DES AES MD5加密

AES加密：

<span style="font-size:18px;">package com.example.encrypdate.util;import java.io.UnsupportedEncodingException;import java.security.InvalidKeyException;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;import javax.crypto.BadPaddingException;import javax.crypto.Cipher;import javax.crypto.IllegalBlockSizeException;import javax.crypto.KeyGenerator;import javax.crypto.NoSuchPaddingException;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;public class AES {/** * 加密 *  * @param content *            需要加密的内容 * @param password *            加密密码 * @return */public static byte[] encrypt(String content, String password) {try {KeyGenerator kgen = KeyGenerator.getInstance("AES");kgen.init(128, new SecureRandom(password.getBytes()));SecretKey secretKey = kgen.generateKey();byte[] enCodeFormat = secretKey.getEncoded();SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");Cipher cipher = Cipher.getInstance("AES");// 创建密码器byte[] byteContent = content.getBytes("utf-8");cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化byte[] result = cipher.doFinal(byteContent);return result; // 加密} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (NoSuchPaddingException e) {e.printStackTrace();} catch (InvalidKeyException e) {e.printStackTrace();} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (IllegalBlockSizeException e) {e.printStackTrace();} catch (BadPaddingException e) {e.printStackTrace();}return null;}/** * 解密 *  * @param content *            待解密内容 * @param password *            解密密钥 * @return */public static byte[] decrypt(byte[] content, String password) {try {KeyGenerator kgen = KeyGenerator.getInstance("AES");kgen.init(128, new SecureRandom(password.getBytes()));SecretKey secretKey = kgen.generateKey();byte[] enCodeFormat = secretKey.getEncoded();SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");Cipher cipher = Cipher.getInstance("AES");// 创建密码器cipher.init(Cipher.DECRYPT_MODE, key);// 初始化byte[] result = cipher.doFinal(content);return result; // 加密} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (NoSuchPaddingException e) {e.printStackTrace();} catch (InvalidKeyException e) {e.printStackTrace();} catch (IllegalBlockSizeException e) {e.printStackTrace();} catch (BadPaddingException e) {e.printStackTrace();}return null;}/** * 将十进制转换成16进制 *  * @param buf * @return */public static String parseByte2HexStr(byte buf[]) {StringBuffer sb = new StringBuffer();for (int i = 0; i < buf.length; i++) {String hex = Integer.toHexString(buf[i] & 0xFF);if (hex.length() == 1) {hex = '0' + hex;}sb.append(hex.toUpperCase());}return sb.toString();}/** * 将16进制转换为十进制 *  * @param hexStr * @return */public static byte[] parseHexStr2Byte(String hexStr) {if (hexStr.length() < 1)return null;byte[] result = new byte[hexStr.length() / 2];for (int i = 0; i < hexStr.length() / 2; i++) {int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2),16);result[i] = (byte) (high * 16 + low);}return result;}}</span>

DES加密：

<span style="font-size:18px;">package com.example.encrypdate.util;import javax.crypto.Cipher;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecretKeySpec;import android.util.Base64;public class DES {// 初始化向量，随机填充private static byte[] iv = { 1, 2, 3, 4, 5, 6, 7, 8 };/** * @param encryptString *            需要加密的明文 * @param encryptKey *            秘钥 * @return 加密后的密文 * @throws Exception */public static String encryptDES(String encryptString, String encryptKey)throws Exception {// 实例化IvParameterSpec对象，使用指定的初始化向量IvParameterSpec zeroIv = new IvParameterSpec(iv);// 实例化SecretKeySpec类，根据字节数组来构造SecretKeySecretKeySpec key = new SecretKeySpec(encryptKey.getBytes(), "DES");// 创建密码器Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");// 用秘钥初始化Cipher对象cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);// 执行加密操作byte[] encryptedData = cipher.doFinal(encryptString.getBytes());return Base64.encodeToString(encryptedData, Base64.DEFAULT);}/**** *  * @param decrypString *            密文 * @param decryptKey *            解密密钥 * @return * @throws Exception */public static String decryptDES(String decrypString, String decryptKey)throws Exception {byte[] byteMi = Base64.decode(decrypString, Base64.DEFAULT);// 实例化IvParameterSpec对象，使用指定的初始化向量IvParameterSpec zeroIv = new IvParameterSpec(iv);// 实例化SecretKeySpec类，根据字节数组来构造SecretKeySecretKeySpec key = new SecretKeySpec(decryptKey.getBytes(), "DES");// 创建密码器Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");// 用秘钥初始化Cipher对象cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);// 执行解密操作byte[] decryptedData = cipher.doFinal(byteMi);return new String(decryptedData);}}</span>

MD5加密：

<span style="font-size:18px;">package com.example.encrypdate.util;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;public class MD5 {/*** * @param data * @return */public static String toMD5(String data) {try {// 实例化一个指定摘要算法为MD5的MessageDigest对象MessageDigest algorithm = MessageDigest.getInstance("MD5");// 重置摘要以供再次使用algorithm.reset();// 使用bytes更新摘要algorithm.update(data.getBytes());// 使用指定的byte数组对摘要进行最的更新，然后完成摘要计算return toHexString(algorithm.digest(), "");} catch (NoSuchAlgorithmException e) {// TODO 自动生成的 catch 块e.printStackTrace();}return "";}// 将字符串中的每个字符转换为十六进制private static String toHexString(byte[] bytes, String separator) {StringBuilder hexstring = new StringBuilder();for (byte b : bytes) {String hex = Integer.toHexString(0xFF & b);if (hex.length() == 1) {hexstring.append('0');}hexstring.append(hex);}return hexstring.toString();}}</span>

测试文件：

<span style="font-size:18px;">package com.example.encrypdate;import com.example.encrypdate.util.AES;import com.example.encrypdate.util.DES;import android.os.Bundle;import android.app.Activity;import android.util.Log;import android.widget.TextView;import com.example.encrypdate.util.MD5;public class MainActivity extends Activity {private TextView tv;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tv = (TextView) this.findViewById(R.id.tv);// DESTest();// MD5Test();AESTest();}public void DESTest() {// 指定秘钥 只能是8位String key = "12345678";// 指定需要加密的明文String text = "多少";Log.i("DES", "DES加密明文：" + text + "\n加密秘钥：" + key);// 调用DES加密try {String encryptResult = DES.encryptDES(text, key);String decryptResult = DES.decryptDES(encryptResult, key);tv.setText("加密结果：" + encryptResult + "\n解密结果：" + decryptResult);Log.i("DES", "加密结果：" + encryptResult + "\n解密结果：" + decryptResult);} catch (Exception e) {// TODO 自动生成的 catch 块e.printStackTrace();}}private void AESTest() {String content = "test3444";String password = "11";// 加密byte[] encryptResult = AES.encrypt(content, password);String encryptResultStr = AES.parseByte2HexStr(encryptResult);// 解密byte[] decryptFrom = AES.parseHexStr2Byte(encryptResultStr);String decryptResult = new String(AES.decrypt(decryptFrom, password));Log.i("AES", "密码：" + password + "\n加密前：" + content + "\n加密后："+ encryptResultStr + "\n解密后：" + decryptResult);tv.setText("密码：" + password + "\n加密前：" + content + "\n加密后："+ encryptResultStr + "\n解密后：" + decryptResult);}private void MD5Test() {String str = "1nakjnvjanbdvjk女嘉宾那覅v骄傲不能浪费的哪里方便v啊别v骄傲不能浪费的哪里方便v啊别v骄傲不能浪费的哪里方便v啊别浪费vu巴娄病v阿拉伯风v ";String MD5Result = MD5.toMD5(str);Log.i("MD5", str + "  MD5加密结果：" + MD5Result);tv.setText(str + "  MD5加密结果：" + MD5Result);}}</span>

完整工程地址：

http://download.csdn.net/detail/u014071669/7930951

另外，非对称加密RSA详解见：

http://blog.csdn.net/yongbingchao/article/details/39346099

更多相关文章

随机推荐