C#加密算法汇总

方法一：

02	//须添加对System.Web的引用

03	using System.Web.Security;

04

05

...

06

07	/// <summary>

08	/// SHA1加密字符串

09	/// </summary>

10	/// <param name="source">源字符串</param>

11	/// <returns>加密后的字符串</returns>

12	public string SHA1(string source)

13

{

14	return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "SHA1");

15

}

16

17

18	/// <summary>

19	/// MD5加密字符串

20	/// </summary>

21	/// <param name="source">源字符串</param>

22	/// <returns>加密后的字符串</returns>

23	public string MD5(string source)

24

{

25	return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "MD5");;

26

}

 

01 方法二(可逆加密解密)：
02     using System.Security.Cryptography;
03
04     ...
05
06     public string Encode(string data)
07     {
08         byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
09         byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
10
11         DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
12         int i = cryptoProvider.KeySize;
13         MemoryStream ms = new MemoryStream();
14         CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);
15
16         StreamWriter sw = new StreamWriter(cst);
17         sw.Write(data);
18         sw.Flush();
19         cst.FlushFinalBlock();
20         sw.Flush();
21         return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
22
23     }
24
25     public string Decode(string data)
26     {
27         byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
28         byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
29
30         byte[] byEnc;
31         try
32         {
33             byEnc = Convert.FromBase64String(data);
34         }
35         catch
36         {
37             return null;
38         }
39
40         DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
41         MemoryStream ms = new MemoryStream(byEnc);
42         CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);
43         StreamReader sr = new StreamReader(cst);
44         return sr.ReadToEnd();
45     }

01 方法三(MD5不可逆)：
02     using System.Security.Cryptography;
03
04     ...
05
06     //MD5不可逆加密
07
08     //32位加密
09
10     public string GetMD5_32(string s, string _input_charset)
11     {
12         MD5 md5 = new MD5CryptoServiceProvider();
13         byte[] t = md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s));
14         StringBuilder sb = new StringBuilder(32);
15         for (int i = 0; i < t.Length; i++)
16         {
17             sb.Append(t[i].ToString("x").PadLeft(2, '0'));
18         }
19         return sb.ToString();
20     }
21
22     //16位加密
23     public static string GetMd5_16(string ConvertString)
24     {
25         MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
26         string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);
27         t2 = t2.Replace("-", "");
28         return t2;
29     }

01 方法四(对称加密)：
02     using System.IO;
03     using System.Security.Cryptography;
04
05     ...
06
07     private SymmetricAlgorithm mobjCryptoService;
08     private string Key;
09     /// <summary>
10     /// 对称加密类的构造函数
11     /// </summary>
12     public SymmetricMethod()
13     {
14         mobjCryptoService = new RijndaelManaged();
15         Key = "Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";
16     }
17     /// <summary>
18     /// 获得密钥
19     /// </summary>
20     /// <returns>密钥</returns>
21     private byte[] GetLegalKey()
22     {
23         string sTemp = Key;
24         mobjCryptoService.GenerateKey();
25         byte[] bytTemp = mobjCryptoService.Key;
26         int KeyLength = bytTemp.Length;
27         if (sTemp.Length > KeyLength)
28             sTemp = sTemp.Substring(0, KeyLength);
29         else if (sTemp.Length < KeyLength)
30             sTemp = sTemp.PadRight(KeyLength, ' ');
31         return ASCIIEncoding.ASCII.GetBytes(sTemp);
32     }
33     /// <summary>
34     /// 获得初始向量IV
35     /// </summary>
36     /// <returns>初试向量IV</returns>
37     private byte[] GetLegalIV()
38     {
39         string sTemp = "E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk";
40         mobjCryptoService.GenerateIV();
41         byte[] bytTemp = mobjCryptoService.IV;
42         int IVLength = bytTemp.Length;
43         if (sTemp.Length > IVLength)
44             sTemp = sTemp.Substring(0, IVLength);
45         else if (sTemp.Length < IVLength)
46             sTemp = sTemp.PadRight(IVLength, ' ');
47         return ASCIIEncoding.ASCII.GetBytes(sTemp);
48     }
49     /// <summary>
50     /// 加密方法
51     /// </summary>
52     /// <param name="Source">待加密的串</param>
53     /// <returns>经过加密的串</returns>
54     public string Encrypto(string Source)
55     {
56         byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);
57         MemoryStream ms = new MemoryStream();
58         mobjCryptoService.Key = GetLegalKey();
59         mobjCryptoService.IV = GetLegalIV();
60         ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
61         CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
62         cs.Write(bytIn, 0, bytIn.Length);
63         cs.FlushFinalBlock();
64         ms.Close();
65         byte[] bytOut = ms.ToArray();
66         return Convert.ToBase64String(bytOut);
67     }
68     /// <summary>
69     /// 解密方法
70     /// </summary>
71     /// <param name="Source">待解密的串</param>
72     /// <returns>经过解密的串</returns>
73     public string Decrypto(string Source)
74     {
75         byte[] bytIn = Convert.FromBase64String(Source);
76         MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);
77         mobjCryptoService.Key = GetLegalKey();
78         mobjCryptoService.IV = GetLegalIV();
79         ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
80         CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
81         StreamReader sr = new StreamReader(cs);
82         return sr.ReadToEnd();
83     }

01 方法五：
02     using System.IO;
03     using System.Security.Cryptography;
04     using System.Text;
05
06     ...
07
08     //默认密钥向量
09     private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
10     /// <summary>
11     /// DES加密字符串
12     /// </summary>
13     /// <param name="encryptString">待加密的字符串</param>
14     /// <param name="encryptKey">加密密钥,要求为8位</param>
15     /// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
16     public static string EncryptDES(string encryptString, string encryptKey)
17     {
18         try
19         {
20             byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
21             byte[] rgbIV = Keys;
22             byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
23             DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
24             MemoryStream mStream = new MemoryStream();
25             CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
26             cStream.Write(inputByteArray, 0, inputByteArray.Length);
27             cStream.FlushFinalBlock();
28             return Convert.ToBase64String(mStream.ToArray());
29         }
30         catch
31         {
32             return encryptString;
33         }
34     }
35
36     /// <summary>
37     /// DES解密字符串
38     /// </summary>
39     /// <param name="decryptString">待解密的字符串</param>
40     /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
41     /// <returns>解密成功返回解密后的字符串，失败返源串</returns>
42     public static string DecryptDES(string decryptString, string decryptKey)
43     {
44         try
45         {
46             byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
47             byte[] rgbIV = Keys;
48             byte[] inputByteArray = Convert.FromBase64String(decryptString);
49             DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
50             MemoryStream mStream = new MemoryStream();
51             CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
52             cStream.Write(inputByteArray, 0, inputByteArray.Length);
53             cStream.FlushFinalBlock();
54             return Encoding.UTF8.GetString(mStream.ToArray());
55         }
56         catch
57         {
58             return decryptString;
59         }
60     }

01 方法六(文件加密)：
02     using System.IO;
03     using System.Security.Cryptography;
04     using System.Text;
05
06     ...
07
08     //加密文件
09     private static void EncryptData(String inName, String outName, byte[] desKey, byte[] desIV)
10     {
11         //Create the file streams to handle the input and output files.
12         FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
13         FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
14         fout.SetLength(0);
15
16         //Create variables to help with read and write.
17         byte[] bin = new byte[100]; //This is intermediate storage for the encryption.
18         long rdlen = 0;              //This is the total number of bytes written.
19         long totlen = fin.Length;    //This is the total length of the input file.
20         int len;                     //This is the number of bytes to be written at a time.
21
22         DES des = new DESCryptoServiceProvider();
23         CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write);
24
25         //Read from the input file, then encrypt and write to the output file.
26         while (rdlen < totlen)
27         {
28             len = fin.Read(bin, 0, 100);
29             encStream.Write(bin, 0, len);
30             rdlen = rdlen + len;
31         }
32
33         encStream.Close();
34         fout.Close();
35         fin.Close();
36     }
37
38     //解密文件
39     private static void DecryptData(String inName, String outName, byte[] desKey, byte[] desIV)
40     {
41         //Create the file streams to handle the input and output files.
42         FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
43         FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
44         fout.SetLength(0);
45
46         //Create variables to help with read and write.
47         byte[] bin = new byte[100]; //This is intermediate storage for the encryption.
48         long rdlen = 0;              //This is the total number of bytes written.
49         long totlen = fin.Length;    //This is the total length of the input file.
50         int len;                     //This is the number of bytes to be written at a time.
51
52         DES des = new DESCryptoServiceProvider();
53         CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(desKey, desIV), CryptoStreamMode.Write);
54
55         //Read from the input file, then encrypt and write to the output file.
56         while (rdlen < totlen)
57         {
58             len = fin.Read(bin, 0, 100);
59             encStream.Write(bin, 0, len);
60             rdlen = rdlen + len;
61         }
62
63         encStream.Close();
64         fout.Close();
65         fin.Close();
66
67 }

 

01 using System;
02 using System.Security.Cryptography;//这个是处理文字编码的前提
03 using System.Text;
04 using System.IO;
05 /// <summary>
06 /// DES加密方法
07 /// </summary>
08 /// <param name="strPlain">明文</param>
09 /// <param name="strDESKey">密钥</param>
10 /// <param name="strDESIV">向量</param>
11 /// <returns>密文</returns>
12 public string DESEncrypt(string strPlain,string strDESKey,string strDESIV)
13 {
14  //把密钥转换成字节数组
15  byte[] bytesDESKey=ASCIIEncoding.ASCII.GetBytes(strDESKey);
16  //把向量转换成字节数组
17  byte[] bytesDESIV=ASCIIEncoding.ASCII.GetBytes(strDESIV);
18  //声明1个新的DES对象
19  DESCryptoServiceProvider desEncrypt=new DESCryptoServiceProvider();
20  //开辟一块内存流
21  MemoryStream msEncrypt=new MemoryStream();
22  //把内存流对象包装成加密流对象
23  CryptoStream csEncrypt=new CryptoStream(msEncrypt,desEncrypt.CreateEncryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Write);
24  //把加密流对象包装成写入流对象
25  StreamWriter swEncrypt=new StreamWriter(csEncrypt);
26  //写入流对象写入明文
27  swEncrypt.WriteLine(strPlain);
28  //写入流关闭
29  swEncrypt.Close();
30  //加密流关闭
31  csEncrypt.Close();
32  //把内存流转换成字节数组，内存流现在已经是密文了
33  byte[] bytesCipher=msEncrypt.ToArray();
34  //内存流关闭
35  msEncrypt.Close();
36  //把密文字节数组转换为字符串，并返回
37  return UnicodeEncoding.Unicode.GetString(bytesCipher);
38 }
39
40
41
42
43 /// <summary>
44 /// DES解密方法
45 /// </summary>
46 /// <param name="strCipher">密文</param>
47 /// <param name="strDESKey">密钥</param>
48 /// <param name="strDESIV">向量</param>
49 /// <returns>明文</returns>
50 public string DESDecrypt(string strCipher,string strDESKey,string strDESIV)
51 {
52  //把密钥转换成字节数组
53  byte[] bytesDESKey=ASCIIEncoding.ASCII.GetBytes(strDESKey);
54  //把向量转换成字节数组
55  byte[] bytesDESIV=ASCIIEncoding.ASCII.GetBytes(strDESIV);
56  //把密文转换成字节数组
57  byte[] bytesCipher=UnicodeEncoding.Unicode.GetBytes(strCipher);
58  //声明1个新的DES对象
59  DESCryptoServiceProvider desDecrypt=new DESCryptoServiceProvider();
60  //开辟一块内存流，并存放密文字节数组
61  MemoryStream msDecrypt=new MemoryStream(bytesCipher);
62  //把内存流对象包装成解密流对象
63  CryptoStream csDecrypt=new CryptoStream(msDecrypt,desDecrypt.CreateDecryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Read);
64  //把解密流对象包装成读出流对象
65  StreamReader srDecrypt=new StreamReader(csDecrypt);
66  //明文=读出流的读出内容
67  string strPlainText=srDecrypt.ReadLine();
68  //读出流关闭
69  srDecrypt.Close();
70  //解密流关闭
71  csDecrypt.Close();
72  //内存流关闭
73  msDecrypt.Close();
74  //返回明文
75  return strPlainText;
76 }

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