//
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());
}