C# Andriod AES 加密算法

android端：

package com.kingmed.http;
import java.io.UnsupportedEncodingException;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
public class AESHelper {
    
private static final String CipherMode =
"AES/ECB/PKCS5Padding";
    
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");
    }
 
   
    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;
    }
 
   
    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;
    }
 
   
    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;
    }
 
   
    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;
    }
 
   
    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
    }
 
   
    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;
    }
}

.NET端：

using System;
using System.Text;
using System.Security.Cryptography;

///
///AESHelper 的摘要说明
///
///
/// AES对称加密解密类
///
public class AESHelper
{
    #region
成员变量
    ///
    ///
密钥(32位,不足在后面补0)
    ///
    private
const string _passwd = "ihlih*0037JOHT*)(PIJY*(()JI^)IO%";
    ///
    ///
运算模式
    ///
    private
static CipherMode _cipherMode = CipherMode.ECB;
    ///
    ///
填充模式
    ///
    private
static PaddingMode _paddingMode = PaddingMode.PKCS7;
    ///
    ///
字符串采用的编码
    ///
    private
static Encoding _encoding = Encoding.UTF8;
   
#endregion

#region
辅助方法
    ///
    ///
获取32byte密钥数据
    ///
    /// 密码
    ///
    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);
    }

///
    ///
将字符数组转换成字符串
    ///
    ///
    ///
    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();
    }

///
    ///
将字符串转换成字符数组
    ///
    ///
    ///
    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
    ///
    ///
加密字节数据
    ///
    ///
要加密的字节数据
    /// 密码
    ///
    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;
    }

///
    ///
加密字符串(加密为16进制字符串)
    ///
    ///
要加密的字符串
    /// 密码
    ///
    public
static string Encrypt(string inputString, string password)
    {
       
byte[] toEncryptArray = _encoding.GetBytes(inputString);
       
byte[] result = Encrypt(toEncryptArray, password);
       
return ConvertByteToString(result);
    }

///
    ///
字符串加密(加密为16进制字符串)
    ///
    ///
需要加密的字符串
    ///
加密后的字符串
    public
static string EncryptString(string inputString)
    {
       
return Encrypt(inputString, _passwd);
    }
   
#endregion

#region
解密
    ///
    ///
解密字节数组
    ///
    ///
要解密的字节数据
    /// 密码
    ///
    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;
    }

///
    ///
解密16进制的字符串为字符串
    ///
    ///
要解密的字符串
    /// 密码
    ///
字符串
    public
static string Decrypt(string inputString, string password)
    {
       
byte[] toDecryptArray = ConvertStringToByte(inputString);
       
string decryptString = _encoding.GetString(Decrypt(toDecryptArray,
password));
       
return decryptString;
    }

///
    ///
解密16进制的字符串为字符串
    ///
    ///
需要解密的字符串
    ///
解密后的字符串
    public
static string DecryptString(string inputString)
    {
       
return Decrypt(inputString, _passwd);
    }
   
#endregion
}

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