C#中使用DES和AES加密解密

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

namespace MyCryptography
{
    ///
    /// DES加密解密
    ///
    public class DES
    {
        ///
        /// 获取密钥
        ///
        private static string Key
        {
            get { return @"P@+#wG+Z"; }
        }

        ///
        /// 获取向量
        ///
        private static string IV
        {
            get { return @"L%n67}G/Mk@k%:~Y"; }
        }

        ///
        /// DES加密
        ///
        /// 明文字符串
        /// 密文
        public static string DESEncrypt(string plainStr)
        {
            byte[] bKey = Encoding.UTF8.GetBytes(Key);
            byte[] bIV = Encoding.UTF8.GetBytes(IV);
            byte[] byteArray = Encoding.UTF8.GetBytes(plainStr);

            string encrypt = null;
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            try
            {
                using (MemoryStream mStream = new MemoryStream())
                {
                    using (CryptoStream cStream = new CryptoStream(mStream, des.CreateEncryptor(bKey, bIV), CryptoStreamMode.Write))
                    {
                        cStream.Write(byteArray, 0, byteArray.Length);
                        cStream.FlushFinalBlock();
                        encrypt = Convert.ToBase64String(mStream.ToArray());
                    }
                }
            }
            catch { }
            des.Clear();

            return encrypt;
        }

        ///
        /// DES解密
        ///
        /// 密文字符串
        /// 明文
        public static string DESDecrypt(string encryptStr)
        {
            byte[] bKey = Encoding.UTF8.GetBytes(Key);
            byte[] bIV = Encoding.UTF8.GetBytes(IV);
            byte[] byteArray = Convert.FromBase64String(encryptStr);

            string decrypt = null;
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            try
            {
                using (MemoryStream mStream = new MemoryStream())
                {
                    using (CryptoStream cStream = new CryptoStream(mStream, des.CreateDecryptor(bKey, bIV), CryptoStreamMode.Write))
                    {
                        cStream.Write(byteArray, 0, byteArray.Length);
                        cStream.FlushFinalBlock();
                        decrypt = Encoding.UTF8.GetString(mStream.ToArray());
                    }
                }
            }
            catch { }
            des.Clear();

            return decrypt;
        }
    }

    ///
    /// AES加密解密
    ///
    public class AES
    {
        ///
        /// 获取密钥
        ///
        private static string Key
        {
            get { return @")O[NB]6,YF}+efcaj{+oESb9d8>Z'e9M"; }
        }

        ///
        /// 获取向量
        ///
        private static string IV
        {
            get { return @"L+/~f4,Ir)b$=pkf"; }
        }

        ///
        /// AES加密
        ///
        /// 明文字符串
        /// 密文
        public static string AESEncrypt(string plainStr)
        {
            byte[] bKey = Encoding.UTF8.GetBytes(Key);
            byte[] bIV = Encoding.UTF8.GetBytes(IV);
            byte[] byteArray = Encoding.UTF8.GetBytes(plainStr);

            string encrypt = null;
            Rijndael aes = Rijndael.Create();
            try
            {
                using (MemoryStream mStream = new MemoryStream())
                {
                    using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateEncryptor(bKey, bIV), CryptoStreamMode.Write))
                    {
                        cStream.Write(byteArray, 0, byteArray.Length);
                        cStream.FlushFinalBlock();
                        encrypt = Convert.ToBase64String(mStream.ToArray());
                    }
                }
            }
            catch { }
            aes.Clear();

            return encrypt;
        }

        ///
        /// AES加密
        ///
        /// 明文字符串
        /// 加密失败时是否返回 null，false 返回 String.Empty
        /// 密文
        public static string AESEncrypt(string plainStr, bool returnNull)
        {
            string encrypt = AESEncrypt(plainStr);
            return returnNull ? encrypt : (encrypt == null ? String.Empty : encrypt);
        }

        ///
        /// AES解密
        ///
        /// 密文字符串
        /// 明文
        public static string AESDecrypt(string encryptStr)
        {
            byte[] bKey = Encoding.UTF8.GetBytes(Key);
            byte[] bIV = Encoding.UTF8.GetBytes(IV);
            byte[] byteArray = Convert.FromBase64String(encryptStr);

            string decrypt = null;
            Rijndael aes = Rijndael.Create();
            try
            {
                using (MemoryStream mStream = new MemoryStream())
                {
                    using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateDecryptor(bKey, bIV), CryptoStreamMode.Write))
                    {
                        cStream.Write(byteArray, 0, byteArray.Length);
                        cStream.FlushFinalBlock();
                        decrypt = Encoding.UTF8.GetString(mStream.ToArray());
                    }
                }
            }
            catch { }
            aes.Clear();

            return decrypt;
        }

        ///
        /// AES解密
        ///
        /// 密文字符串
        /// 解密失败时是否返回 null，false 返回 String.Empty
        /// 明文
        public static string AESDecrypt(string encryptStr, bool returnNull)
        {
            string decrypt = AESDecrypt(encryptStr);
            return returnNull ? decrypt : (decrypt == null ? String.Empty : decrypt);
        }
    }
}