Data stream encryption and decryption of C

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

using System.Security.Cryptography;
using System.IO;
using System.Globalization;


namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
  /// <summary>
    ///  Password encryption and decryption operation related classes 
    /// </summary>
    public static class PassWordHelper
    {
        #region MD5  encryption 
 
        /// <summary>
        /// MD5 encryption 
        /// </summary>
        public static string Md532(this string source)
        {
            if (String.IsNullOrEmpty(source)) return null;
            var encoding = Encoding.UTF8;
            MD5 md5 = MD5.Create();
            return HashAlgorithmBase(md5, source, encoding);
        }
 
        /// <summary>
        ///  Add salt MD5 encryption 
        /// </summary>
        public static string Md532Salt(this string source, string salt)
        {
            return String.IsNullOrEmpty(salt) ? source.Md532() : (source + "『" + salt + "』").Md532();
        }
 
        #endregion
 
        #region SHA  encryption 
 
        /// <summary>
        /// SHA1  encryption 
        /// </summary>
        public static string Sha1(this string source)
        {
            if (String.IsNullOrEmpty(source)) return null;
            var encoding = Encoding.UTF8;
            SHA1 sha1 = new SHA1CryptoServiceProvider();
            return HashAlgorithmBase(sha1, source, encoding);
        }
 
        /// <summary>
        /// SHA256  encryption 
        /// </summary>
        public static string Sha256(this string source)
        {
            if (String.IsNullOrEmpty(source)) return null;
            var encoding = Encoding.UTF8;
            SHA256 sha256 = new SHA256Managed();
            return HashAlgorithmBase(sha256, source, encoding);
        }
 
        /// <summary>
        /// SHA512  encryption 
        /// </summary>
        public static string Sha512(this string source)
        {
            if (String.IsNullOrEmpty(source)) return null;
            var encoding = Encoding.UTF8;
            SHA512 sha512 = new SHA512Managed();
            return HashAlgorithmBase(sha512, source, encoding);
        }
 
        #endregion
 
        #region HMAC  encryption 
 
        /// <summary>
        /// HmacSha1  encryption 
        /// </summary>
        public static string HmacSha1(this string source, string keyVal)
        {
            if (String.IsNullOrEmpty(source)) return null;
            var encoding = Encoding.UTF8;
            byte[] keyStr = encoding.GetBytes(keyVal);
            HMACSHA1 hmacSha1 = new HMACSHA1(keyStr);
            return HashAlgorithmBase(hmacSha1, source, encoding);
        }
 
        /// <summary>
        /// HmacSha256  encryption 
        /// </summary>
        public static string HmacSha256(this string source, string keyVal)
        {
            if (String.IsNullOrEmpty(source)) return null;
            var encoding = Encoding.UTF8;
            byte[] keyStr = encoding.GetBytes(keyVal);
            HMACSHA256 hmacSha256 = new HMACSHA256(keyStr);
            return HashAlgorithmBase(hmacSha256, source, encoding);
        }
 
        /// <summary>
        /// HmacSha384  encryption 
        /// </summary>
        public static string HmacSha384(this string source, string keyVal)
        {
            if (String.IsNullOrEmpty(source)) return null;
            var encoding = Encoding.UTF8;
            byte[] keyStr = encoding.GetBytes(keyVal);
            HMACSHA384 hmacSha384 = new HMACSHA384(keyStr);
            return HashAlgorithmBase(hmacSha384, source, encoding);
        }
 
        /// <summary>
        /// HmacSha512  encryption 
        /// </summary>
        public static string HmacSha512(this string source, string keyVal)
        {
            if (String.IsNullOrEmpty(source)) return null;
            var encoding = Encoding.UTF8;
            byte[] keyStr = encoding.GetBytes(keyVal);
            HMACSHA512 hmacSha512 = new HMACSHA512(keyStr);
            return HashAlgorithmBase(hmacSha512, source, encoding);
        }
 
        /// <summary>
        /// HmacMd5  encryption 
        /// </summary>
        public static string HmacMd5(this string source, string keyVal)
        {
            if (String.IsNullOrEmpty(source)) return null;
            var encoding = Encoding.UTF8;
            byte[] keyStr = encoding.GetBytes(keyVal);
            HMACMD5 hmacMd5 = new HMACMD5(keyStr);
            return HashAlgorithmBase(hmacMd5, source, encoding);
        }
 
        /// <summary>
        /// HmacRipeMd160  encryption 
        /// </summary>
        public static string HmacRipeMd160(this string source, string keyVal)
        {
            if (String.IsNullOrEmpty(source)) return null;
            var encoding = Encoding.UTF8;
            byte[] keyStr = encoding.GetBytes(keyVal);
            HMACRIPEMD160 hmacRipeMd160 = new HMACRIPEMD160(keyStr);
            return HashAlgorithmBase(hmacRipeMd160, source, encoding);
        }
 
        #endregion
 
        #region AES  Encryption and decryption 
 
        /// <summary>  
        /// AES encryption   
        /// </summary>  
        /// <param name="source"> Fields to be encrypted </param>  
        /// <param name="keyVal"> Key value </param>  
        /// <param name="ivVal"> Encrypt auxiliary vectors </param> 
        /// <returns></returns>  
        public static string AesStr(this string source, string keyVal, string ivVal)
        {
            var encoding = Encoding.UTF8;
            byte[] btKey = keyVal.FormatByte(encoding);
            byte[] btIv = ivVal.FormatByte(encoding);
            byte[] byteArray = encoding.GetBytes(source);
            string encrypt;
            Rijndael aes = Rijndael.Create();
            using (MemoryStream mStream = new MemoryStream())
            {
                using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateEncryptor(btKey, btIv), CryptoStreamMode.Write))
                {
                    cStream.Write(byteArray, 0, byteArray.Length);
                    cStream.FlushFinalBlock();
                    encrypt = Convert.ToBase64String(mStream.ToArray());
                }
            }
            aes.Clear();
            return encrypt;
        }
 
        /// <summary>  
        /// AES Decrypt   
        /// </summary>  
        /// <param name="source"> Fields to be encrypted </param>  
        /// <param name="keyVal"> Key value </param>  
        /// <param name="ivVal"> Encrypt auxiliary vectors </param>  
        /// <returns></returns>  
        public static string UnAesStr(this string source, string keyVal, string ivVal)
        {
            var encoding = Encoding.UTF8;
            byte[] btKey = keyVal.FormatByte(encoding);
            byte[] btIv = ivVal.FormatByte(encoding);
            byte[] byteArray = Convert.FromBase64String(source);
            string decrypt;
            Rijndael aes = Rijndael.Create();
            using (MemoryStream mStream = new MemoryStream())
            {
                using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateDecryptor(btKey, btIv), CryptoStreamMode.Write))
                {
                    cStream.Write(byteArray, 0, byteArray.Length);
                    cStream.FlushFinalBlock();
                    decrypt = encoding.GetString(mStream.ToArray());
                }
            }
            aes.Clear();
            return decrypt;
        }
 
        /// <summary>  
        /// AES Byte type   encryption   
        /// </summary>  
        /// <param name="data"> Plaintext to be encrypted </param>  
        /// <param name="keyVal"> Key value </param>  
        /// <param name="ivVal"> Encrypt auxiliary vectors </param>  
        /// <returns></returns>  
        public static byte[] AesByte(this byte[] data, string keyVal, string ivVal)
        {
            byte[] bKey = new byte[32];
            Array.Copy(Encoding.UTF8.GetBytes(keyVal.PadRight(bKey.Length)), bKey, bKey.Length);
            byte[] bVector = new byte[16];
            Array.Copy(Encoding.UTF8.GetBytes(ivVal.PadRight(bVector.Length)), bVector, bVector.Length);
            byte[] cryptograph;
            Rijndael aes = Rijndael.Create();
            try
            {
                using (MemoryStream mStream = new MemoryStream())
                {
                    using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateEncryptor(bKey, bVector), CryptoStreamMode.Write))
                    {
                        cStream.Write(data, 0, data.Length);
                        cStream.FlushFinalBlock();
                        cryptograph = mStream.ToArray();
                    }
                }
            }
            catch
            {
                cryptograph = null;
            }
            return cryptograph;
        }
 
        /// <summary>  
        /// AES Byte type   Decrypt   
        /// </summary>  
        /// <param name="data"> Plaintext to be decrypted </param>  
        /// <param name="keyVal"> Key value </param>  
        /// <param name="ivVal"> Encrypt auxiliary vectors </param> 
        /// <returns></returns>  
        public static byte[] UnAesByte(this byte[] data, string keyVal, string ivVal)
        {
            byte[] bKey = new byte[32];
            Array.Copy(Encoding.UTF8.GetBytes(keyVal.PadRight(bKey.Length)), bKey, bKey.Length);
            byte[] bVector = new byte[16];
            Array.Copy(Encoding.UTF8.GetBytes(ivVal.PadRight(bVector.Length)), bVector, bVector.Length);
            byte[] original;
            Rijndael aes = Rijndael.Create();
            try
            {
                using (MemoryStream mStream = new MemoryStream(data))
                {
                    using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateDecryptor(bKey, bVector), CryptoStreamMode.Read))
                    {
                        using (MemoryStream originalMemory = new MemoryStream())
                        {
                            byte[] buffer = new byte[1024];
                            int readBytes;
                            while ((readBytes = cStream.Read(buffer, 0, buffer.Length)) > 0)
                            {
                                originalMemory.Write(buffer, 0, readBytes);
                            }
 
                            original = originalMemory.ToArray();
                        }
                    }
                }
            }
            catch
            {
                original = null;
            }
            return original;
        }
 
        #endregion
 
        #region RSA  Encryption and decryption 
 
        // Key pair , Please use it with the key generation tool 『 http://download.csdn.net/detail/downiis6/9464639 』
        private const string PublicRsaKey = @"pubKey";
        private const string PrivateRsaKey = @"priKey";
 
        /// <summary>
        /// RSA  encryption 
        /// </summary>
        public static string Rsa(this string source)
        {
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(PublicRsaKey);
            var cipherbytes = rsa.Encrypt(Encoding.UTF8.GetBytes(source), true);
            return Convert.ToBase64String(cipherbytes);
        }
 
        /// <summary>
        /// RSA Decrypt 
        /// </summary>
        public static string UnRsa(this string source)
        {
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(PrivateRsaKey);
            var cipherbytes = rsa.Decrypt(Convert.FromBase64String(source), true);
            return Encoding.UTF8.GetString(cipherbytes);
        }
 
        #endregion
 
        #region DES  Encryption and decryption 
 
        /// <summary>
        /// DES  encryption 
        /// </summary>
        public static string Des(this string source, string keyVal, string ivVal)
        {
            try
            {
                byte[] data = Encoding.UTF8.GetBytes(source);
                var des = new DESCryptoServiceProvider { Key = Encoding.ASCII.GetBytes(keyVal.Length > 8 ? keyVal.Substring(0, 8) : keyVal), IV = Encoding.ASCII.GetBytes(ivVal.Length > 8 ? ivVal.Substring(0, 8) : ivVal) };
                var desencrypt = des.CreateEncryptor();
                byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
                return BitConverter.ToString(result);
            }
            catch { return " Conversion error ！"; }
        }
 
        /// <summary>
        /// DES  Decrypt 
        /// </summary>
        public static string UnDes(this string source, string keyVal, string ivVal)
        {
            try
            {
                string[] sInput = source.Split("-".ToCharArray());
                byte[] data = new byte[sInput.Length];
                for (int i = 0; i < sInput.Length; i++)
                {
                    data[i] = byte.Parse(sInput[i], NumberStyles.HexNumber);
                }
                var des = new DESCryptoServiceProvider { Key = Encoding.ASCII.GetBytes(keyVal.Length > 8 ? keyVal.Substring(0, 8) : keyVal), IV = Encoding.ASCII.GetBytes(ivVal.Length > 8 ? ivVal.Substring(0, 8) : ivVal) };
                var desencrypt = des.CreateDecryptor();
                byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
                return Encoding.UTF8.GetString(result);
            }
            catch { return " Decryption error ！"; }
        }
 
        #endregion
 
        #region TripleDES  Encryption and decryption 
 
        /// <summary>
        /// DES3  encryption 
        /// </summary>
        public static string Des3(this string source, string keyVal)
        {
            try
            {
                TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider
                {
                    Key = keyVal.FormatByte(Encoding.UTF8),
                    Mode = CipherMode.ECB,
                    Padding = PaddingMode.PKCS7
                };
                using (MemoryStream ms = new MemoryStream())
                {
                    byte[] btArray = Encoding.UTF8.GetBytes(source);
                    try
                    {
                        using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
                        {
                            cs.Write(btArray, 0, btArray.Length);
                            cs.FlushFinalBlock();
                        }
                        return ms.ToArray().Bytes2Str();
                    }
                    catch { return source; }
                }
            }
            catch
            {
                return "TripleDES Encryption error ";
            }
        }
 
        /// <summary>
        /// DES3  Decrypt 
        /// </summary>
        public static string UnDes3(this string source, string keyVal)
        {
            try
            {
                byte[] byArray = source.Str2Bytes();
                TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider
                {
                    Key = keyVal.FormatByte(Encoding.UTF8),
                    Mode = CipherMode.ECB,
                    Padding = PaddingMode.PKCS7
                };
                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(byArray, 0, byArray.Length);
                        cs.FlushFinalBlock();
                        cs.Close();
                        ms.Close();
                        return Encoding.UTF8.GetString(ms.ToArray());
                    }
                }
            }
            catch
            {
                return "TripleDES Decryption error ";
            }
        }
 
        #endregion
 
        #region BASE64  Encryption and decryption 
 
        /// <summary>
        /// BASE64  encryption 
        /// </summary>
        /// <param name="source"> Fields to be encrypted </param>
        /// <returns></returns>
        public static string Base64(this string source)
        {
            var btArray = Encoding.UTF8.GetBytes(source);
            return Convert.ToBase64String(btArray, 0, btArray.Length);
        }
 
        /// <summary>
        /// BASE64  Decrypt 
        /// </summary>
        /// <param name="source"> Fields to be decrypted </param>
        /// <returns></returns>
        public static string UnBase64(this string source)
        {
            var btArray = Convert.FromBase64String(source);
            return Encoding.UTF8.GetString(btArray);
        }
 
        #endregion
 
        #region  Internal methods 
		 
        /// <summary>
        ///  Turn it into an array 
        /// </summary>
        private static byte[] Str2Bytes(this string source)
        {
            source = source.Replace(" ", "");
            byte[] buffer = new byte[source.Length / 2];
            for (int i = 0; i < source.Length; i += 2) buffer[i / 2] = Convert.ToByte(source.Substring(i, 2), 16);
            return buffer;
        }
 
        /// <summary>
        ///  Convert to string 
        /// </summary>
        private static string Bytes2Str(this IEnumerable<byte> source, string formatStr = "{0:X2}")
        {
            StringBuilder pwd = new StringBuilder();
            foreach (byte btStr in source) { pwd.AppendFormat(formatStr, btStr); }
            return pwd.ToString();
        }
 
        private static byte[] FormatByte(this string strVal, Encoding encoding)
        {
            return encoding.GetBytes(strVal.Base64().Substring(0, 16).ToUpper());
        }
 
        /// <summary>
        /// HashAlgorithm  Unified encryption method 
        /// </summary>
        private static string HashAlgorithmBase(HashAlgorithm hashAlgorithmObj, string source, Encoding encoding)
        {
            byte[] btStr = encoding.GetBytes(source);
            byte[] hashStr = hashAlgorithmObj.ComputeHash(btStr);
            return hashStr.Bytes2Str();
        }
 
        #endregion
    }

}