Android和.NET通用的AES算法
原文引自 http://www.cnblogs.com/ahui/archive/2011/04/22/2025045.html
1.NET源代码:
using System;using System.Text;using System.Security.Cryptography;namespace ConsoleApplicationDemo{ /// <summary> /// AES对称加密解密类 /// </summary> public class AESHelper { #region 成员变量 /// <summary> /// 密钥(32位,不足在后面补0) /// </summary> private const string _passwd = "ihlih*0037JOHT*)(PIJY*(()JI^)IO%"; /// <summary> /// 运算模式 /// </summary> private static CipherMode _cipherMode = CipherMode.ECB; /// <summary> /// 填充模式 /// </summary> private static PaddingMode _paddingMode = PaddingMode.PKCS7; /// <summary> /// 字符串采用的编码 /// </summary> private static Encoding _encoding = Encoding.UTF8; #endregion #region 辅助方法 /// <summary> /// 获取32byte密钥数据 /// </summary> /// <param name="password">密码</param> /// <returns></returns> private static byte[] GetKeyArray(string password) { if (password == null) { password = string.Empty; } if (password.Length < 32) { password = password.PadRight(32, '0'); } else if (password.Length > 32) { password = password.Substring(0, 32); } return _encoding.GetBytes(password); } /// <summary> /// 将字符数组转换成字符串 /// </summary> /// <param name="inputData"></param> /// <returns></returns> private static string ConvertByteToString(byte[] inputData) { StringBuilder sb = new StringBuilder(inputData.Length * 2); foreach (var b in inputData) { sb.Append(b.ToString("X2")); } return sb.ToString(); } /// <summary> /// 将字符串转换成字符数组 /// </summary> /// <param name="inputString"></param> /// <returns></returns> private static byte[] ConvertStringToByte(string inputString) { if (inputString == null || inputString.Length < 2) { throw new ArgumentException(); } int l = inputString.Length / 2; byte[] result = new byte[l]; for (int i = 0; i < l; ++i) { result[i] = Convert.ToByte(inputString.Substring(2 * i, 2), 16); } return result; } #endregion #region 加密 /// <summary> /// 加密字节数据 /// </summary> /// <param name="inputData">要加密的字节数据</param> /// <param name="password">密码</param> /// <returns></returns> public static byte[] Encrypt(byte[] inputData, string password) { AesCryptoServiceProvider aes = new AesCryptoServiceProvider(); aes.Key = GetKeyArray(password); aes.Mode = _cipherMode; aes.Padding = _paddingMode; ICryptoTransform transform = aes.CreateEncryptor(); byte[] data = transform.TransformFinalBlock(inputData, 0, inputData.Length); aes.Clear(); return data; } /// <summary> /// 加密字符串(加密为16进制字符串) /// </summary> /// <param name="inputString">要加密的字符串</param> /// <param name="password">密码</param> /// <returns></returns> public static string Encrypt(string inputString, string password) { byte[] toEncryptArray = _encoding.GetBytes(inputString); byte[] result = Encrypt(toEncryptArray, password); return ConvertByteToString(result); } /// <summary> /// 字符串加密(加密为16进制字符串) /// </summary> /// <param name="inputString">需要加密的字符串</param> /// <returns>加密后的字符串</returns> public static string EncryptString(string inputString) { return Encrypt(inputString, _passwd); } #endregion #region 解密 /// <summary> /// 解密字节数组 /// </summary> /// <param name="inputData">要解密的字节数据</param> /// <param name="password">密码</param> /// <returns></returns> public static byte[] Decrypt(byte[] inputData, string password) { AesCryptoServiceProvider aes = new AesCryptoServiceProvider(); aes.Key = GetKeyArray(password); aes.Mode = _cipherMode; aes.Padding = _paddingMode; ICryptoTransform transform = aes.CreateDecryptor(); byte[] data = null; try { data = transform.TransformFinalBlock(inputData, 0, inputData.Length); } catch { return null; } aes.Clear(); return data; } /// <summary> /// 解密16进制的字符串为字符串 /// </summary> /// <param name="inputString">要解密的字符串</param> /// <param name="password">密码</param> /// <returns>字符串</returns> public static string Decrypt(string inputString, string password) { byte[] toDecryptArray = ConvertStringToByte(inputString); string decryptString = _encoding.GetString(Decrypt(toDecryptArray, password)); return decryptString; } /// <summary> /// 解密16进制的字符串为字符串 /// </summary> /// <param name="inputString">需要解密的字符串</param> /// <returns>解密后的字符串</returns> public static string DecryptString(string inputString) { return Decrypt(inputString, _passwd); } #endregion }}2.Android代码:
package com.google.test;
import java.io.UnsupportedEncodingException;import javax.crypto.Cipher;import javax.crypto.spec.SecretKeySpec;/** AES对称加密解密类 **/public class AESHelper { /** 算法/模式/填充 **/ private static final String CipherMode = "AES/ECB/PKCS5Padding"; /** 创建密钥 **/ private static SecretKeySpec createKey(String password) { byte[] data = null; if (password == null) { password = ""; } StringBuffer sb = new StringBuffer(32); sb.append(password); while (sb.length() < 32) { sb.append("0"); } if (sb.length() > 32) { sb.setLength(32); } try { data = sb.toString().getBytes("UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return new SecretKeySpec(data, "AES"); } /** 加密字节数据 **/ public static byte[] encrypt(byte[] content, String password) { try { SecretKeySpec key = createKey(password); Cipher cipher = Cipher.getInstance(CipherMode); cipher.init(Cipher.ENCRYPT_MODE, key); byte[] result = cipher.doFinal(content); return result; } catch (Exception e) { e.printStackTrace(); } return null; } /** 加密(结果为16进制字符串) **/ public static String encrypt(String content, String password) { byte[] data = null; try { data = content.getBytes("UTF-8"); } catch (Exception e) { e.printStackTrace(); } data = encrypt(data, password); String result = byte2hex(data); return result; } /** 解密字节数组 **/ public static byte[] decrypt(byte[] content, String password) { try { SecretKeySpec key = createKey(password); Cipher cipher = Cipher.getInstance(CipherMode); cipher.init(Cipher.DECRYPT_MODE, key); byte[] result = cipher.doFinal(content); return result; } catch (Exception e) { e.printStackTrace(); } return null; } /** 解密16进制的字符串为字符串 **/ public static String decrypt(String content, String password) { byte[] data = null; try { data = hex2byte(content); } catch (Exception e) { e.printStackTrace(); } data = decrypt(data, password); if (data == null) return null; String result = null; try { result = new String(data, "UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return result; } /** 字节数组转成16进制字符串 **/ public static String byte2hex(byte[] b) { // 一个字节的数， StringBuffer sb = new StringBuffer(b.length * 2); String tmp = ""; for (int n = 0; n < b.length; n++) { // 整数转成十六进制表示 tmp = (java.lang.Integer.toHexString(b[n] & 0XFF)); if (tmp.length() == 1) { sb.append("0"); } sb.append(tmp); } return sb.toString().toUpperCase(); // 转成大写 } /** 将hex字符串转换成字节数组 **/ private static byte[] hex2byte(String inputString) { if (inputString == null || inputString.length() < 2) { return new byte[0]; } inputString = inputString.toLowerCase(); int l = inputString.length() / 2; byte[] result = new byte[l]; for (int i = 0; i < l; ++i) { String tmp = inputString.substring(2 * i, 2 * i + 2); result[i] = (byte) (Integer.parseInt(tmp, 16) & 0xFF); } return result; }}另:要支持AES/ECB/ZeroBytePadding(对应.net的PaddingMode.Zeros)，需引入bcprov .jar!
