AES && DES加解密

MD5加密一般不可逆，只能暴力突破。所以这边记录一下一些关于字符串的加解密的两种方法，以便自己学习

AES

   public class AESHelper
    {
        public static string AESEncrypt(string text)
        {
            return AESEnc(text, KeyStruct.strKey);
        }

        public static string AESDecrypt(string text)
        {
            return AESDes(text, KeyStruct.strKey);
        }
        //加密
        private static string AESEnc(string text, string mkey)
        {
            using (RijndaelManaged rijndael = new RijndaelManaged())
            {
                rijndael.Mode = CipherMode.ECB;
                rijndael.Padding = PaddingMode.PKCS7;
                rijndael.KeySize = 128;
                rijndael.BlockSize = 128;
                byte[] pwdBytes = Encoding.Default.GetBytes(mkey);
                byte[] keyBytes = new byte[16];
                int len = pwdBytes.Length > keyBytes.Length ? keyBytes.Length : pwdBytes.Length;
                Array.Copy(pwdBytes, keyBytes, len);
                rijndael.Key = keyBytes;
                using (ICryptoTransform tranform = rijndael.CreateEncryptor())
                {
                    byte[] txtBytes = Encoding.Default.GetBytes(text);                 
                    return Convert.ToBase64String(tranform.TransformFinalBlock(txtBytes, 0, txtBytes.Length));
                }
            }          
        }
        //解密
        private static string AESDes(string text, string key)
        {
            using (RijndaelManaged rijndael = new RijndaelManaged())
            {
                rijndael.Mode = CipherMode.ECB;
                rijndael.Padding = PaddingMode.PKCS7;
                rijndael.KeySize = 128;
                rijndael.BlockSize = 128;
                byte[] encryptedData = Convert.FromBase64String(text);
                byte[] pwdBytes = Encoding.Default.GetBytes(key);
                byte[] keyBytes = new byte[16];
                int len = pwdBytes.Length > keyBytes.Length ? keyBytes.Length : pwdBytes.Length;
                Array.Copy(pwdBytes, keyBytes, len);
                rijndael.Key = keyBytes;
                using (ICryptoTransform tranform = rijndael.CreateDecryptor())
                {
                    var a = tranform.TransformFinalBlock(encryptedData, 0, encryptedData.Length);
                    return Encoding.Default.GetString(a);
                }
            }   
        }

        private  struct KeyStruct
        {
            public static string strKey = "****";
        }
    }

DES

public class DesHelper
    {
        private static string desKey = "****";
        public static string DesEncrypt(string text)
        {
            return DesEnc(text, desKey);
        }
        public static string DesDescript(string text)
        {
            return DesDes(text, desKey);
        }
        private static string DesEnc(string text, string dkey)
        {
            using (DESCryptoServiceProvider descry = new DESCryptoServiceProvider())
            {
                byte[] txtBytes = Encoding.Default.GetBytes(text);
                byte[] keyBytes =ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.
                    HashPasswordForStoringInConfigFile(dkey, "MD5").Substring(0, 8));              
                descry.Key = keyBytes;
                descry.IV = keyBytes;  //获取或设置对称算法的初始化向量,这边默认向量为key
                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cs = new CryptoStream(ms, descry.CreateEncryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(txtBytes, 0, txtBytes.Length);
                        cs.FlushFinalBlock();
                    }
                    //StringBuilder ret = new StringBuilder();
                    //foreach (byte b in ms.ToArray())
                    //{
                    //    ret.AppendFormat("{0:X2}", b);
                    //}
                    return Convert.ToBase64String(ms.ToArray());
                }
            }
        }

        private static string DesDes(string text, string dkey)
        {
            try
            {
                using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
                {
                    byte[] txtBytes = Convert.FromBase64String(text);
                    des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.
                             HashPasswordForStoringInConfigFile(dkey, "MD5").Substring(0, 8));
                    des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.
                          HashPasswordForStoringInConfigFile(dkey, "MD5").Substring(0, 8));
                    using (MemoryStream ms = new MemoryStream())
                    {
                        using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
                        {
                            cs.Write(txtBytes, 0, txtBytes.Length);
                            cs.FlushFinalBlock();
                            return Encoding.Default.GetString(ms.ToArray());
                        }
                    }
                }
            }
            catch (Exception ex)
            {                
                throw ex;
            }
        }
    }