轉(zhuǎn)自：http://www.cnblogs.com/ahui/archive/2011/04/22/2025045.html

1.NET源代碼:

view sourceprint?

001	using System;

002	using System.Text;

003	using System.Security.Cryptography;

004

??

005	namespace ConsoleApplicationDemo

006

{

007	????/// <summary>

008	????/// AES對稱加密解密類

009	????/// </summary>

010	????public class AESHelper

011

????{

012	????????#region 成員變量

013	????????/// <summary>

014	????????/// 密鑰(32位,不足在后面補(bǔ)0)

015	????????/// </summary>

016	????????private const string _passwd = "ihlih*0037JOHT*)(PIJY*(()JI^)IO%";

017	????????/// <summary>

018	????????/// 運(yùn)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	????????/// 字符串采用的編碼

027	????????/// </summary>

028	????????private static Encoding _encoding = Encoding.UTF8;

029	????????#endregion

030

??

031	????????#region 輔助方法

032	????????/// <summary>

033	????????/// 獲取32byte密鑰數(shù)據(jù)

034	????????/// </summary>

035	????????/// <param name="password">密碼</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	????????/// 將字符數(shù)組轉(zhuǎn)換成字符串

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	????????/// 將字符串轉(zhuǎn)換成字符數(shù)組

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	????????/// 加密字節(jié)數(shù)據(jù)

096	????????/// </summary>

097	????????/// <param name="inputData">要加密的字節(jié)數(shù)據(jù)</param>

098	????????/// <param name="password">密碼</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(加密為16進(jìn)制字符串)

114	????????/// </summary>

115	????????/// <param name="inputString">要加密的字符串</param>

116	????????/// <param name="password">密碼</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(加密為16進(jìn)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	????????/// 解密字節(jié)數(shù)組

139	????????/// </summary>

140	????????/// <param name="inputData">要解密的字節(jié)數(shù)據(jù)</param>

141	????????/// <param name="password">密碼</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進(jìn)制的字符串為字符串

165	????????/// </summary>

166	????????/// <param name="inputString">要解密的字符串</param>

167	????????/// <param name="password">密碼</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進(jìn)制的字符串為字符串

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代碼:

view sourceprint?

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對稱加密解密類 **/

008	public class AESHelper {

009

??

010	????/** 算法/模式/填充 **/

011	????private static final String CipherMode = "AES/ECB/PKCS5Padding";

012

??

013	????/** 創(chuàng)建密鑰 **/

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	????/** 加密字節(jié)數(shù)據(jù) **/

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(結(jié)果為16進(jìn)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	????/** 解密字節(jié)數(shù)組 **/

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進(jìn)制的字符串為字符串 **/

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	????/** 字節(jié)數(shù)組轉(zhuǎn)成16進(jìn)制字符串 **/

098	????public static String byte2hex(byte[] b) { // 一個字節(jié)的數(shù)，

099	????????StringBuffer sb = new StringBuffer(b.length * 2);

100	????????String tmp = "";

101	????????for (int n = 0; n < b.length; n++) {

102	????????????// 整數(shù)轉(zhuǎn)成十六進(jìn)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(); // 轉(zhuǎn)成大寫

110

????}

111

??

112	????/** 將hex字符串轉(zhuǎn)換成字節(jié)數(shù)組 **/

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

}

轉(zhuǎn)載于:https://www.cnblogs.com/huanglong/archive/2011/06/27/2091328.html

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