Summary of C# encryption algorithms (recommended)

//Must add a reference
using ; 
... 
/// <summary> 
/// SHA1 encryption string
/// </summary> 
/// <param name="source">source string</param>
/// <returns> Encrypted string</returns>
public string SHA1(string source) 
{ 
return (source, "SHA1"); 
} 
/// <summary> 
/// MD5 encrypted string
/// </summary> 
/// <param name="source">source string</param>
/// <returns> Encrypted string</returns>
public string MD5(string source) 
{ 
return (source, "MD5");; 
}

using ; 
... 
public string Encode(string data) 
{ 
byte[] byKey = (KEY_64); 
byte[] byIV = (IV_64); 
DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider(); 
int i = ; 
MemoryStream ms = new MemoryStream(); 
CryptoStream cst = new CryptoStream(ms, (byKey, byIV), ); 
StreamWriter sw = new StreamWriter(cst); 
(data); 
(); 
(); 
(); 
return Convert.ToBase64String((), 0, (int)); 
} 
public string Decode(string data) 
{ 
byte[] byKey = (KEY_64); 
byte[] byIV = (IV_64); 
byte[] byEnc; 
try 
{ 
byEnc = Convert.FromBase64String(data); 
} 
catch 
{ 
return null; 
} 
DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider(); 
MemoryStream ms = new MemoryStream(byEnc); 
CryptoStream cst = new CryptoStream(ms, (byKey, byIV), ); 
StreamReader sr = new StreamReader(cst); 
return (); 
}

using ; 
... 
//MD5 irreversible encryption
//32-bit encryption
public string GetMD5_32(string s, string _input_charset) 
{ 
MD5 md5 = new MD5CryptoServiceProvider(); 
byte[] t = ((_input_charset).GetBytes(s)); 
StringBuilder sb = new StringBuilder(32); 
for (int i = 0; i < ; i++) 
{ 
(t[i].ToString("x").PadLeft(2, '0')); 
} 
return (); 
} 
//16-bit encryption
public static string GetMd5_16(string ConvertString) 
{ 
MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); 
string t2 = (((ConvertString)), 4, 8); 
t2 = ("-", ""); 
return t2; 
}

using ; 
using ; 
... 
private SymmetricAlgorithm mobjCryptoService; 
private string Key; 
/// <summary> 
/// Constructor of symmetric encryption class
/// </summary> 
public SymmetricMethod() 
{ 
mobjCryptoService = new RijndaelManaged(); 
Key = "Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7"; 
} 
/// <summary> 
/// Obtain the key
/// </summary> 
/// <returns>Key</returns>
private byte[] GetLegalKey() 
{ 
string sTemp = Key; 
(); 
byte[] bytTemp = ; 
int KeyLength = ; 
if ( > KeyLength) 
sTemp = (0, KeyLength); 
else if ( < KeyLength) 
sTemp = (KeyLength, ' '); 
return (sTemp); 
} 
/// <summary> 
/// Obtain the initial vector IV
/// </summary> 
/// <returns>First trial vector IV</returns>
private byte[] GetLegalIV() 
{ 
string sTemp = "E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk"; 
(); 
byte[] bytTemp = ; 
int IVLength = ; 
if ( > IVLength) 
sTemp = (0, IVLength); 
else if ( < IVLength) 
sTemp = (IVLength, ' '); 
return (sTemp); 
} 
/// <summary> 
/// Encryption method
/// </summary> 
/// <param name="Source">String to be encrypted</param>
/// <returns>Encrypted string</returns>
public string Encrypto(string Source) 
{ 
byte[] bytIn = UTF8Encoding.(Source); 
MemoryStream ms = new MemoryStream(); 
= GetLegalKey(); 
= GetLegalIV(); 
ICryptoTransform encrypto = (); 
CryptoStream cs = new CryptoStream(ms, encrypto, ); 
(bytIn, 0, ); 
(); 
(); 
byte[] bytOut = (); 
return Convert.ToBase64String(bytOut); 
} 
/// <summary> 
/// Decryption method
/// </summary> 
/// <param name="Source">Serial to be decrypted</param>
/// <returns>Decrypted string</returns>
public string Decrypto(string Source) 
{ 
byte[] bytIn = Convert.FromBase64String(Source); 
MemoryStream ms = new MemoryStream(bytIn, 0, ); 
= GetLegalKey(); 
= GetLegalIV(); 
ICryptoTransform encrypto = (); 
CryptoStream cs = new CryptoStream(ms, encrypto, ); 
StreamReader sr = new StreamReader(cs); 
return (); 
}

using ; 
using ; 
using ; 
... 
//Default key vector
private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; 
/// <summary> 
/// DES encryption string
/// </summary> 
/// <param name="encryptString">Stand to be encrypted</param>
/// <param name="encryptKey">Encrypt key, required to be 8 bits</param>
/// <returns> Encryption successfully returns the encrypted string, and fails to return the source string</returns>
public static string EncryptDES(string encryptString, string encryptKey) 
{ 
try 
{ 
byte[] rgbKey = Encoding.((0, 8)); 
byte[] rgbIV = Keys; 
byte[] inputByteArray = Encoding.(encryptString); 
DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider(); 
MemoryStream mStream = new MemoryStream(); 
CryptoStream cStream = new CryptoStream(mStream, (rgbKey, rgbIV), ); 
(inputByteArray, 0, ); 
(); 
return Convert.ToBase64String(()); 
} 
catch 
{ 
return encryptString; 
} 
} 
/// <summary> 
/// DES decryption string
/// </summary> 
/// <param name="decryptString">Stand to be decrypted</param>
/// <param name="decryptKey">The decrypt key is required to be 8 bits, the same as the encryption key</param>
/// <returns>The decryption successfully returns the decrypted string, and the source string is returned to the failed</returns>
public static string DecryptDES(string decryptString, string decryptKey) 
{ 
try 
{ 
byte[] rgbKey = Encoding.(decryptKey); 
byte[] rgbIV = Keys; 
byte[] inputByteArray = Convert.FromBase64String(decryptString); 
DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider(); 
MemoryStream mStream = new MemoryStream(); 
CryptoStream cStream = new CryptoStream(mStream, (rgbKey, rgbIV), ); 
(inputByteArray, 0, ); 
(); 
return Encoding.(()); 
} 
catch 
{ 
return decryptString; 
} 
}

using ; 
using ; 
using ; 
... 
//Encrypted file
private static void EncryptData(String inName, String outName, byte[] desKey, byte[] desIV) 
{ 
//Create the file streams to handle the input and output files. 
FileStream fin = new FileStream(inName, , ); 
FileStream fout = new FileStream(outName, , ); 
(0); 
//Create variables to help with read and write. 
byte[] bin = new byte[100]; //This is intermediate storage for the encryption. 
long rdlen = 0; //This is the total number of bytes written. 
long totlen = ; //This is the total length of the input file. 
int len; //This is the number of bytes to be written at a time. 
DES des = new DESCryptoServiceProvider(); 
CryptoStream encStream = new CryptoStream(fout, (desKey, desIV), ); 
//Read from the input file, then encrypt and write to the output file. 
while (rdlen < totlen) 
{ 
len = (bin, 0, 100); 
(bin, 0, len); 
rdlen = rdlen + len; 
} 
(); 
(); 
(); 
} 
//Decrypt the file
private static void DecryptData(String inName, String outName, byte[] desKey, byte[] desIV) 
{ 
//Create the file streams to handle the input and output files. 
FileStream fin = new FileStream(inName, , ); 
FileStream fout = new FileStream(outName, , ); 
(0); 
//Create variables to help with read and write. 
byte[] bin = new byte[100]; //This is intermediate storage for the encryption. 
long rdlen = 0; //This is the total number of bytes written. 
long totlen = ; //This is the total length of the input file. 
int len; //This is the number of bytes to be written at a time. 
DES des = new DESCryptoServiceProvider(); 
CryptoStream encStream = new CryptoStream(fout, (desKey, desIV), ); 
//Read from the input file, then encrypt and write to the output file. 
while (rdlen < totlen) 
{ 
len = (bin, 0, 100); 
(bin, 0, len); 
rdlen = rdlen + len; 
} 
(); 
(); 
(); 
}

using System;
using ;//This is the prerequisite for handling text encoding
using ;
using ;
/// <summary>
/// DES encryption method
/// </summary>
/// <param name="strPlain">Plaintext</param>
/// <param name="strDESKey">key</param>
/// <param name="strDESIV">Vector</param>
/// <returns>ciphertext</returns>
public string DESEncrypt(string strPlain,string strDESKey,string strDESIV)
{
//Convert key to byte array
byte[] bytesDESKey=(strDESKey);
//Convert vectors into byte arrays
byte[] bytesDESIV=(strDESIV);
//Declare 1 new DES object
DESCryptoServiceProvider desEncrypt=new DESCryptoServiceProvider();
//Open a memory stream
MemoryStream msEncrypt=new MemoryStream();
//Package the memory stream object into an encrypted stream object
CryptoStream csEncrypt=new CryptoStream(msEncrypt,(bytesDESKey,bytesDESIV),);
//Package the encrypted stream object into a write stream object
StreamWriter swEncrypt=new StreamWriter(csEncrypt);
//Write stream object to write plain text
(strPlain);
//Write stream closes
();
//Encrypted stream is closed
();
//Convert the memory stream into a byte array, and the memory stream is now ciphertext
byte[] bytesCipher=();
//Memory stream is closed
();
//Convert ciphertext byte array to string and return
return (bytesCipher);
}
/// <summary>
/// DES decryption method
/// </summary>
/// <param name="strCipher">ciphertext</param>
/// <param name="strDESKey">key</param>
/// <param name="strDESIV">Vector</param>
/// <returns>Plain text</returns>
public string DESDecrypt(string strCipher,string strDESKey,string strDESIV)
{
//Convert key to byte array
byte[] bytesDESKey=(strDESKey);
//Convert vectors into byte arrays
byte[] bytesDESIV=(strDESIV);
//Convert ciphertext to byte array
byte[] bytesCipher=(strCipher);
//Declare 1 new DES object
DESCryptoServiceProvider desDecrypt=new DESCryptoServiceProvider();
//Open a memory stream and store a cryptographic byte array
MemoryStream msDecrypt=new MemoryStream(bytesCipher);
//Package the memory stream object into a decrypted stream object
CryptoStream csDecrypt=new CryptoStream(msDecrypt,(bytesDESKey,bytesDESIV),);
//Package the decrypted stream object into a read stream object
StreamReader srDecrypt=new StreamReader(csDecrypt);
//Plain text = read content of read stream
string strPlainText=();
//Read stream is closed
();
//Decryption stream is closed
();
//Memory stream is closed
();
//Return to the plain text
return strPlainText;
}