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 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 }
view source
print
?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 }
