.Net(c#)加密解密之Aes和Des
原文：http://www.cnblogs.com/GodX/p/4223851.html
.Net(c#)加密解密工具类：
///
/// .Net加密解密帮助类
///
public class NetCryptoHelper
{
#region des实现
///
/// Des默认密钥向量
///
public static byte[] DesIv = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
///
/// Des加解密钥必须8位
///
public const string DesKey = "deskey8w";
///
/// 获取Des8位密钥
///
/// Des密钥字符串
/// Des8位密钥
static byte[] GetDesKey(string key)
{
if (string.IsNullOrEmpty(key))
{
throw new ArgumentNullException("key", "Des密钥不能为空");
}
if (key.Length > 8)
{
key = key.Substring(0, 8);
}
if (key.Length < 8)
{
// 不足8补全
key = key.PadRight(8, '0');
}
return Encoding.UTF8.GetBytes(key);
}
///
/// Des加密
///
/// 源字符串
/// des密钥，长度必须8位
/// 密钥向量
/// 加密后的字符串
public static string EncryptDes(string source, string key, byte[] iv)
{
using (DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider())
{
byte[] rgbKeys = GetDesKey(key),
rgbIvs = iv,
inputByteArray = Encoding.UTF8.GetBytes(source);
using (MemoryStream memoryStream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, desProvider.CreateEncryptor(rgbKeys, rgbIvs), CryptoStreamMode.Write))
{
cryptoStream.Write(inputByteArray, 0, inputByteArray.Length);
cryptoStream.FlushFinalBlock();
// 1.第一种
return Convert.ToBase64String(memoryStream.ToArray());
// 2.第二种
//StringBuilder result = new StringBuilder();
//foreach (byte b in memoryStream.ToArray())
//{
// result.AppendFormat("{0:X2}", b);
//}
//return result.ToString();
}
}
}
}
///
/// Des解密
///
/// 源字符串
/// des密钥，长度必须8位
/// 密钥向量
/// 解密后的字符串
public static string DecryptDes(string source, string key, byte[] iv)
{
using (DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider())
{
byte[] rgbKeys = GetDesKey(key),
rgbIvs = iv,
inputByteArray = Convert.FromBase64String(source);
using (MemoryStream memoryStream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, desProvider.CreateDecryptor(rgbKeys, rgbIvs), CryptoStreamMode.Write))
{
cryptoStream.Write(inputByteArray, 0, inputByteArray.Length);
cryptoStream.FlushFinalBlock();
return Encoding.UTF8.GetString(memoryStream.ToArray());
}
}
}
}
#endregion
#region aes实现
///
/// Aes加解密钥必须32位
///
public static string AesKey = "asekey32w";
///
/// 获取Aes32位密钥
///
/// Aes密钥字符串
/// Aes32位密钥
static byte[] GetAesKey(string key)
{
if (string.IsNullOrEmpty(key))
{
throw new ArgumentNullException("key", "Aes密钥不能为空");
}
if (key.Length < 32)
{
// 不足32补全
key = key.PadRight(32, '0');
}
if (key.Length > 32)
{
key = key.Substring(0, 32);
}
return Encoding.UTF8.GetBytes(key);
}
///
/// Aes加密
///
/// 源字符串
/// aes密钥，长度必须32位
/// 加密后的字符串
public static string EncryptAes(string source, string key)
{
using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider())
{
aesProvider.Key = GetAesKey(key);
aesProvider.Mode = CipherMode.ECB;
aesProvider.Padding = PaddingMode.PKCS7;
using (ICryptoTransform cryptoTransform = aesProvider.CreateEncryptor())
{
byte[] inputBuffers = Encoding.UTF8.GetBytes(source);
byte[] results = cryptoTransform.TransformFinalBlock(inputBuffers, 0, inputBuffers.Length);
aesProvider.Clear();
aesProvider.Dispose();
return Convert.ToBase64String(results, 0, results.Length);
}
}
}
///
/// Aes解密
///
/// 源字符串
/// aes密钥，长度必须32位
/// 解密后的字符串
public static string DecryptAes(string source, string key)
{
using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider())
{
aesProvider.Key = GetAesKey(key);
aesProvider.Mode = CipherMode.ECB;
aesProvider.Padding = PaddingMode.PKCS7;
using (ICryptoTransform cryptoTransform = aesProvider.CreateDecryptor())
{
byte[] inputBuffers = Convert.FromBase64String(source);
byte[] results = cryptoTransform.TransformFinalBlock(inputBuffers, 0, inputBuffers.Length);
aesProvider.Clear();
return Encoding.UTF8.GetString(results);
}
}
}
#endregion
}
调试运行：
class Program
{
static void Main(string[] args)
{
string plainText = "博客园",
encryptString = NetCryptoHelper.EncryptDes(plainText, NetCryptoHelper.DesKey, NetCryptoHelper.DesIv);
Console.WriteLine("des加密前的字符串:{0}", plainText);
Console.WriteLine("des加密后的字符串:{0}", encryptString);
Console.WriteLine("des解密后的字符串:{0}", NetCryptoHelper.DecryptDes(encryptString, NetCryptoHelper.DesKey, NetCryptoHelper.DesIv));
Console.WriteLine("-----------分割线-----------");
Console.WriteLine("aes加密前的字符串:{0}", plainText);
encryptString = NetCryptoHelper.EncryptAes(plainText, NetCryptoHelper.AesKey);
Console.WriteLine("aes加密后的字符串:{0}", encryptString);
Console.WriteLine("aes解密后的字符串:{0}", NetCryptoHelper.DecryptAes(encryptString, NetCryptoHelper.AesKey));
Console.ReadKey();
}
}
结果
