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使用DES对称加密代码,支持中文

来源:互联网  宽屏版  评论
2008-12-13 08:24:14

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//名称空间

using System;

using System.Security.Cryptography;

using System.IO;

using System.Text;

//方法

//加密方法

public string Encrypt(string pToEncrypt, string sKey)

{

DESCryptoServiceProvider des = new DESCryptoServiceProvider();

//把字符串放到byte数组中

//原来使用的UTF8编码,我改成Unicode编码了,不行

byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);

//byte[] inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt);

//建立加密对象的密钥和偏移量

//原文使用ASCIIEncoding.ASCII方法的GetBytes方法

//使得输入密码必须输入英文文本

des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

MemoryStream ms = new MemoryStream();

CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(),CryptoStreamMode.Write);

//Write the byte array into the crypto stream

//(It will end up in the memory stream)

cs.Write(inputByteArray, 0, inputByteArray.Length);

cs.FlushFinalBlock();

//Get the data back from the memory stream, and into a string

StringBuilder ret = new StringBuilder();

foreach(byte b in ms.ToArray())

{

//Format as hex

ret.AppendFormat("{0:X2}", b);

}

ret.ToString();

return ret.ToString();

}

//解密方法

public string Decrypt(string pToDecrypt, string sKey)

{

DESCryptoServiceProvider des = new DESCryptoServiceProvider();

//Put the input string into the byte array

byte[] inputByteArray = new byte[pToDecrypt.Length / 2];

for(int x = 0; x < pToDecrypt.Length / 2; x++)

{

int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));

inputByteArray[x] = (byte)i;

}

//建立加密对象的密钥和偏移量,此值重要,不能修改

des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

MemoryStream ms = new MemoryStream();

CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(),CryptoStreamMode.Write);

//Flush the data through the crypto stream into the memory stream

cs.Write(inputByteArray, 0, inputByteArray.Length);

cs.FlushFinalBlock();

//Get the decrypted data back from the memory stream

//建立StringBuild对象,CreateDecrypt使用的是流对象,必须把解密后的文本变成流对象

StringBuilder ret = new StringBuilder();

return System.Text.Encoding.Default.GetString(ms.ToArray());

}

//-------代码完毕--------------------

//名称空间

using System;

using System.Security.Cryptography;

using System.IO;

using System.Text;

//方法

//加密方法

public string Encrypt(string pToEncrypt, string sKey)

{

DESCryptoServiceProvider des = new DESCryptoServiceProvider();

//把字符串放到byte数组中

//原来使用的UTF8编码,我改成Unicode编码了,不行

byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);

//byte[] inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt);

//建立加密对象的密钥和偏移量

//原文使用ASCIIEncoding.ASCII方法的GetBytes方法

//使得输入密码必须输入英文文本

des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

MemoryStream ms = new MemoryStream();

CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(),CryptoStreamMode.Write);

//Write the byte array into the crypto stream

//(It will end up in the memory stream)

cs.Write(inputByteArray, 0, inputByteArray.Length);

cs.FlushFinalBlock();

//Get the data back from the memory stream, and into a string

StringBuilder ret = new StringBuilder();

foreach(byte b in ms.ToArray())

{

//Format as hex

ret.AppendFormat("{0:X2}", b);

}

ret.ToString();

return ret.ToString();

}

//解密方法

public string Decrypt(string pToDecrypt, string sKey)

{

DESCryptoServiceProvider des = new DESCryptoServiceProvider();

//Put the input string into the byte array

byte[] inputByteArray = new byte[pToDecrypt.Length / 2];

for(int x = 0; x < pToDecrypt.Length / 2; x++)

{

int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));

inputByteArray[x] = (byte)i;

}

//建立加密对象的密钥和偏移量,此值重要,不能修改

des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

MemoryStream ms = new MemoryStream();

CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(),CryptoStreamMode.Write);

//Flush the data through the crypto stream into the memory stream

cs.Write(inputByteArray, 0, inputByteArray.Length);

cs.FlushFinalBlock();

//Get the decrypted data back from the memory stream

//建立StringBuild对象,CreateDecrypt使用的是流对象,必须把解密后的文本变成流对象

StringBuilder ret = new StringBuilder();

return System.Text.Encoding.Default.GetString(ms.ToArray());

}

//-------代码完毕--------------------

注意:sKey输入密码的时候,必须使用英文字符,区分大小写,且字符数量是8个,不能多也不能少,否则出错。

本人使用Windows2000 Server .Net Framework SP3 ,VS.Net下在asp.net下使用成功,加密解密正常!

view plaincopy to clipboardprint? //名称空间 using System; using System.Security.Cryptography; using System.IO; using System.Text; //方法 //加密方法 public string Encrypt(string pToEncrypt, string sKey) { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); //把字符串放到byte数组中 //原来使用的UTF8编码,我改成Unicode编码了,不行 byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt); //byte[] inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt); //建立加密对象的密钥和偏移量 //原文使用ASCIIEncoding.ASCII方法的GetBytes方法 //使得输入密码必须输入英文文本 des.Key = ASCIIEncoding.ASCII.GetBytes(sKey); des.IV = ASCIIEncoding.ASCII.GetBytes(sKey); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(),CryptoStreamMode.Write); //Write the byte array into the crypto stream //(It will end up in the memory stream) cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); //Get the data back from the memory stream, and into a string StringBuilder ret = new StringBuilder(); foreach(byte b in ms.ToArray()) { //Format as hex ret.AppendFormat("{0:X2}", b); } ret.ToString(); return ret.ToString(); } //解密方法 public string Decrypt(string pToDecrypt, string sKey) { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); //Put the input string into the byte array byte[] inputByteArray = new byte[pToDecrypt.Length / 2]; for(int x = 0; x < pToDecrypt.Length / 2; x++) { int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16)); inputByteArray[x] = (byte)i; } //建立加密对象的密钥和偏移量,此值重要,不能修改 des.Key = ASCIIEncoding.ASCII.GetBytes(sKey); des.IV = ASCIIEncoding.ASCII.GetBytes(sKey); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(),CryptoStreamMode.Write); //Flush the data through the crypto stream into the memory stream cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); //Get the decrypted data back from the memory stream //建立StringBuild对象,CreateDecrypt使用的是流对象,必须把解密后的文本变成流对象 StringBuilder ret = new StringBuilder(); return System.Text.Encoding.Default.GetString(ms.ToArray()); } //-------代码完毕-------------------- //名称空间 using System; using System.Security.Cryptography; using System.IO; using System.Text; //方法 //加密方法 public string Encrypt(string pToEncrypt, string sKey) { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); //把字符串放到byte数组中 //原来使用的UTF8编码,我改成Unicode编码了,不行 byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt); //byte[] inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt); //建立加密对象的密钥和偏移量 //原文使用ASCIIEncoding.ASCII方法的GetBytes方法 //使得输入密码必须输入英文文本 des.Key = ASCIIEncoding.ASCII.GetBytes(sKey); des.IV = ASCIIEncoding.ASCII.GetBytes(sKey); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(),CryptoStreamMode.Write); //Write the byte array into the crypto stream //(It will end up in the memory stream) cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); //Get the data back from the memory stream, and into a string StringBuilder ret = new StringBuilder(); foreach(byte b in ms.ToArray()) { //Format as hex ret.AppendFormat("{0:X2}", b); } ret.ToString(); return ret.ToString(); } //解密方法 public string Decrypt(string pToDecrypt, string sKey) { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); //Put the input string into the byte array byte[] inputByteArray = new byte[pToDecrypt.Length / 2]; for(int x = 0; x < pToDecrypt.Length / 2; x++) { int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16)); inputByteArray[x] = (byte)i; } //建立加密对象的密钥和偏移量,此值重要,不能修改 des.Key = ASCIIEncoding.ASCII.GetBytes(sKey); des.IV = ASCIIEncoding.ASCII.GetBytes(sKey); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(),CryptoStreamMode.Write); //Flush the data through the crypto stream into the memory stream cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); //Get the decrypted data back from the memory stream //建立StringBuild对象,CreateDecrypt使用的是流对象,必须把解密后的文本变成流对象 StringBuilder ret = new StringBuilder(); return System.Text.Encoding.Default.GetString(ms.ToArray()); } //-------代码完毕-------------------- 注意:sKey输入密码的时候,必须使用英文字符,区分大小写,且字符数量是8个,不能多也不能少,否则出错。 本人使用Windows2000 Server .Net Framework SP3 ,VS.Net下在asp.net下使用成功,加密解密正常!
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