转自：http://www.cnblogs.com/ahui/archive/2011/04/22/2025045.html

1.NET源代码:

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001 using System;
002 using System.Text;
003 using System.Security.Cryptography;
004   
005 namespace ConsoleApplicationDemo
006 {
007     /// <summary>
008     /// AES对称加密解密类
009     /// </summary>
010     public class AESHelper
011     {
012         #region 成员变量
013         /// <summary>
014         /// 密钥(32位,不足在后面补0)
015         /// </summary>
016         private const string _passwd = "ihlih*0037JOHT*)(PIJY*(()JI^)IO%";
017         /// <summary>
018         /// 运算模式
019         /// </summary>
020         private static CipherMode _cipherMode = CipherMode.ECB;
021         /// <summary>
022         /// 填充模式
023         /// </summary>
024         private static PaddingMode _paddingMode = PaddingMode.PKCS7;
025         /// <summary>
026         /// 字符串采用的编码
027         /// </summary>
028         private static Encoding _encoding = Encoding.UTF8;
029         #endregion
030   
031         #region 辅助方法
032         /// <summary>
033         /// 获取32byte密钥数据
034         /// </summary>
035         /// <param name="password">密码</param>
036         /// <returns></returns>
037         private static byte[] GetKeyArray(string password)
038         {
039             if (password == null)
040             {
041                 password = string.Empty;
042             }
043   
044             if (password.Length < 32)
045             {
046                 password = password.PadRight(32, '0');
047             }
048             else if (password.Length > 32)
049             {
050                 password = password.Substring(0, 32);
051             }
052   
053             return _encoding.GetBytes(password);
054         }
055   
056         /// <summary>
057         /// 将字符数组转换成字符串
058         /// </summary>
059         /// <param name="inputData"></param>
060         /// <returns></returns>
061         private static string ConvertByteToString(byte[] inputData)
062         {
063             StringBuilder sb = new StringBuilder(inputData.Length * 2);
064             foreach (var b in inputData)
065             {
066                 sb.Append(b.ToString("X2"));
067             }
068             return sb.ToString();
069         }
070   
071         /// <summary>
072         /// 将字符串转换成字符数组
073         /// </summary>
074         /// <param name="inputString"></param>
075         /// <returns></returns>
076         private static byte[] ConvertStringToByte(string inputString)
077         {
078             if (inputString == null || inputString.Length < 2)
079             {
080                 throw new ArgumentException();
081             }
082             int l = inputString.Length / 2;
083             byte[] result = new byte[l];
084             for (int i = 0; i < l; ++i)
085             {
086                 result[i] = Convert.ToByte(inputString.Substring(2 * i, 2), 16);
087             }
088   
089             return result;
090         }
091         #endregion
092   
093         #region 加密
094         /// <summary>
095         /// 加密字节数据
096         /// </summary>
097         /// <param name="inputData">要加密的字节数据</param>
098         /// <param name="password">密码</param>
099         /// <returns></returns>
100         public static byte[] Encrypt(byte[] inputData, string password)
101         {
102             AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
103             aes.Key = GetKeyArray(password);
104             aes.Mode = _cipherMode;
105             aes.Padding = _paddingMode;
106             ICryptoTransform transform = aes.CreateEncryptor();
107             byte[] data = transform.TransformFinalBlock(inputData, 0, inputData.Length);
108             aes.Clear();
109             return data;
110         }
111   
112         /// <summary>
113         /// 加密字符串(加密为16进制字符串)
114         /// </summary>
115         /// <param name="inputString">要加密的字符串</param>
116         /// <param name="password">密码</param>
117         /// <returns></returns>
118         public static string Encrypt(string inputString, string password)
119         {
120             byte[] toEncryptArray = _encoding.GetBytes(inputString);
121             byte[] result = Encrypt(toEncryptArray, password);
122             return ConvertByteToString(result);
123         }
124   
125         /// <summary>
126         /// 字符串加密(加密为16进制字符串)
127         /// </summary>
128         /// <param name="inputString">需要加密的字符串</param>
129         /// <returns>加密后的字符串</returns>
130         public static string EncryptString(string inputString)
131         {
132             return Encrypt(inputString, _passwd);
133         }
134         #endregion
135   
136         #region 解密
137         /// <summary>
138         /// 解密字节数组
139         /// </summary>
140         /// <param name="inputData">要解密的字节数据</param>
141         /// <param name="password">密码</param>
142         /// <returns></returns>
143         public static byte[] Decrypt(byte[] inputData, string password)
144         {
145             AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
146             aes.Key = GetKeyArray(password);
147             aes.Mode = _cipherMode;
148             aes.Padding = _paddingMode;
149             ICryptoTransform transform = aes.CreateDecryptor();
150             byte[] data = null;
151             try
152             {
153                 data = transform.TransformFinalBlock(inputData, 0, inputData.Length);
154             }
155             catch
156             {
157                 return null;
158             }
159             aes.Clear();
160             return data;
161         }
162   
163         /// <summary>
164         /// 解密16进制的字符串为字符串
165         /// </summary>
166         /// <param name="inputString">要解密的字符串</param>
167         /// <param name="password">密码</param>
168         /// <returns>字符串</returns>
169         public static string Decrypt(string inputString, string password)
170         {
171             byte[] toDecryptArray = ConvertStringToByte(inputString);
172             string decryptString = _encoding.GetString(Decrypt(toDecryptArray, password));
173             return decryptString;
174         }
175   
176         /// <summary>
177         /// 解密16进制的字符串为字符串
178         /// </summary>
179         /// <param name="inputString">需要解密的字符串</param>
180         /// <returns>解密后的字符串</returns>
181         public static string DecryptString(string inputString)
182         {
183             return Decrypt(inputString, _passwd);
184         }
185         #endregion
186     }
187 }

2.Android代码:

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001 package com.google.test;
002   
003 import java.io.UnsupportedEncodingException;
004 import javax.crypto.Cipher;
005 import javax.crypto.spec.SecretKeySpec;
006   
007 /** AES对称加密解密类 **/
008 public class AESHelper {
009   
010     /** 算法/模式/填充 **/
011     private static final String CipherMode = "AES/ECB/PKCS5Padding";
012   
013     /** 创建密钥 **/
014     private static SecretKeySpec createKey(String password) {
015         byte[] data = null;
016         if (password == null) {
017             password = "";
018         }
019         StringBuffer sb = new StringBuffer(32);
020         sb.append(password);
021         while (sb.length() < 32) {
022             sb.append("0");
023         }
024         if (sb.length() > 32) {
025             sb.setLength(32);
026         }
027   
028         try {
029             data = sb.toString().getBytes("UTF-8");
030         } catch (UnsupportedEncodingException e) {
031             e.printStackTrace();
032         }
033         return new SecretKeySpec(data, "AES");
034     }
035   
036     /** 加密字节数据 **/
037     public static byte[] encrypt(byte[] content, String password) {
038         try {
039             SecretKeySpec key = createKey(password);
040             Cipher cipher = Cipher.getInstance(CipherMode);
041             cipher.init(Cipher.ENCRYPT_MODE, key);
042             byte[] result = cipher.doFinal(content);
043             return result;
044         } catch (Exception e) {
045             e.printStackTrace();
046         }
047         return null;
048     }
049   
050     /** 加密(结果为16进制字符串) **/
051     public static String encrypt(String content, String password) {
052         byte[] data = null;
053         try {
054             data = content.getBytes("UTF-8");
055         } catch (Exception e) {
056             e.printStackTrace();
057         }
058         data = encrypt(data, password);
059         String result = byte2hex(data);
060         return result;
061     }
062   
063     /** 解密字节数组 **/
064     public static byte[] decrypt(byte[] content, String password) {
065         try {
066             SecretKeySpec key = createKey(password);
067             Cipher cipher = Cipher.getInstance(CipherMode);
068             cipher.init(Cipher.DECRYPT_MODE, key);
069             byte[] result = cipher.doFinal(content);
070             return result;
071         } catch (Exception e) {
072             e.printStackTrace();
073         }
074         return null;
075     }
076   
077     /** 解密16进制的字符串为字符串 **/
078     public static String decrypt(String content, String password) {
079         byte[] data = null;
080         try {
081             data = hex2byte(content);
082         } catch (Exception e) {
083             e.printStackTrace();
084         }
085         data = decrypt(data, password);
086         if (data == null)
087             return null;
088         String result = null;
089         try {
090             result = new String(data, "UTF-8");
091         } catch (UnsupportedEncodingException e) {
092             e.printStackTrace();
093         }
094         return result;
095     }
096   
097     /** 字节数组转成16进制字符串 **/
098     public static String byte2hex(byte[] b) { // 一个字节的数，
099         StringBuffer sb = new StringBuffer(b.length * 2);
100         String tmp = "";
101         for (int n = 0; n < b.length; n++) {
102             // 整数转成十六进制表示
103             tmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
104             if (tmp.length() == 1) {
105                 sb.append("0");
106             }
107             sb.append(tmp);
108         }
109         return sb.toString().toUpperCase(); // 转成大写
110     }
111   
112     /** 将hex字符串转换成字节数组 **/
113     private static byte[] hex2byte(String inputString) {
114         if (inputString == null || inputString.length() < 2) {
115             return new byte[0];
116         }
117         inputString = inputString.toLowerCase();
118         int l = inputString.length() / 2;
119         byte[] result = new byte[l];
120         for (int i = 0; i < l; ++i) {
121             String tmp = inputString.substring(2 * i, 2 * i + 2);
122             result[i] = (byte) (Integer.parseInt(tmp, 16) & 0xFF);
123         }
124         return result;
125     }
126 }