C#编写的Base64加密和解密类
这个C#类是一个基于Base64的加密和解密类，用户可以可以使用默认的秘钥进行加密、解密，也可以自己设定秘钥进行加密和解密，非常实用
代码一：非常精简的代码
///<summary>
///Base64加密，解密方法
///</summary>
///<paramname="s">输入字符串</param>
///<paramname="c">true-加密,false-解密</param>
staticpublicstringbase64(strings,boolc)
{
if(c)
{
returnSystem.Convert.ToBase64String(System.Text.Encoding.Default.GetBytes(s));
}
else
{
try
{
returnSystem.Text.Encoding.Default.GetString(System.Convert.FromBase64String(pwdString));
}
catch(Exceptionexp)
{
returnexp.Message;
}
}
}
代码二：
usingSystem;
usingSystem.Security.Cryptography;
usingSystem.Text;
namespaceDotNet.Utilities
{
///<summary>
///Encrypt的摘要说明。
///</summary>
publicclassDEncrypt
{
///<summary>
///构造方法
///</summary>
publicDEncrypt()
{
}
#region使用缺省密钥字符串加密/解密string
///<summary>
///使用缺省密钥字符串加密string
///</summary>
///<paramname="original">明文</param>
///<returns>密文</returns>
publicstaticstringEncrypt(stringoriginal)
{
returnEncrypt(original,"sharejs.com");
}
///<summary>
///使用缺省密钥字符串解密string
///</summary>
///<paramname="original">密文</param>
///<returns>明文</returns>
publicstaticstringDecrypt(stringoriginal)
{
returnDecrypt(original,"sharejs.com",System.Text.Encoding.Default);
}
#endregion
#region使用给定密钥字符串加密/解密string
///<summary>
///使用给定密钥字符串加密string
///</summary>
///<paramname="original">原始文字</param>
///<paramname="key">密钥</param>
///<paramname="encoding">字符编码方案</param>
///<returns>密文</returns>
publicstaticstringEncrypt(stringoriginal,stringkey)
{
byte[]buff=System.Text.Encoding.Default.GetBytes(original);
byte[]kb=System.Text.Encoding.Default.GetBytes(key);
returnConvert.ToBase64String(Encrypt(buff,kb));
}
///<summary>
///使用给定密钥字符串解密string
///</summary>
///<paramname="original">密文</param>
///<paramname="key">密钥</param>
///<returns>明文</returns>
publicstaticstringDecrypt(stringoriginal,stringkey)
{
returnDecrypt(original,key,System.Text.Encoding.Default);
}
///<summary>
///使用给定密钥字符串解密string,返回指定编码方式明文
///</summary>
///<paramname="encrypted">密文</param>
///<paramname="key">密钥</param>
///<paramname="encoding">字符编码方案</param>
///<returns>明文</returns>
publicstaticstringDecrypt(stringencrypted,stringkey,Encodingencoding)
{
byte[]buff=Convert.FromBase64String(encrypted);
byte[]kb=System.Text.Encoding.Default.GetBytes(key);
returnencoding.GetString(Decrypt(buff,kb));
}
#endregion
#region使用缺省密钥字符串加密/解密/byte[]
///<summary>
///使用缺省密钥字符串解密byte[]
///</summary>
///<paramname="encrypted">密文</param>
///<paramname="key">密钥</param>
///<returns>明文</returns>
publicstaticbyte[]Decrypt(byte[]encrypted)
{
byte[]key=System.Text.Encoding.Default.GetBytes("sharejs.com");
returnDecrypt(encrypted,key);
}
///<summary>
///使用缺省密钥字符串加密
///</summary>
///<paramname="original">原始数据</param>
///<paramname="key">密钥</param>
///<returns>密文</returns>
publicstaticbyte[]Encrypt(byte[]original)
{
byte[]key=System.Text.Encoding.Default.GetBytes("sharejs.com");
returnEncrypt(original,key);
}
#endregion
#region使用给定密钥加密/解密/byte[]
///<summary>
///生成MD5摘要
///</summary>
///<paramname="original">数据源</param>
///<returns>摘要</returns>
publicstaticbyte[]MakeMD5(byte[]original)
{
MD5CryptoServiceProviderhashmd5=newMD5CryptoServiceProvider();
byte[]keyhash=hashmd5.ComputeHash(original);
hashmd5=null;
returnkeyhash;
}
///<summary>
///使用给定密钥加密
///</summary>
///<paramname="original">明文</param>
///<paramname="key">密钥</param>
///<returns>密文</returns>
publicstaticbyte[]Encrypt(byte[]original,byte[]key)
{
TripleDESCryptoServiceProviderdes=newTripleDESCryptoServiceProvider();
des.Key=MakeMD5(key);
des.Mode=CipherMode.ECB;
returndes.CreateEncryptor().TransformFinalBlock(original,0,original.Length);
}
///<summary>
///使用给定密钥解密数据
///</summary>
///<paramname="encrypted">密文</param>
///<paramname="key">密钥</param>
///<returns>明文</returns>
publicstaticbyte[]Decrypt(byte[]encrypted,byte[]key)
{
TripleDESCryptoServiceProviderdes=newTripleDESCryptoServiceProvider();
des.Key=MakeMD5(key);
des.Mode=CipherMode.ECB;
returndes.CreateDecryptor().TransformFinalBlock(encrypted,0,encrypted.Length);
}
#endregion
}
}
代码三：
usingSystem;
usingSystem.Collections.Generic;
usingSystem.Text;
namespaceMyLibs.encrypt
{
publicclassBase64
{
privatestaticstringbase64EncodeChars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";//编码后的字符集
privatestaticint[]base64DecodeChars=newint[]{-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63,52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1};//对应ASICC字符的位置
publicstaticstringbase64encode(stringstr)
{//加密
stringOut="";
inti=0,len=str.Length;
charc1,c2,c3;
while(i<len)
{
c1=Convert.ToChar(str[i++]&0xff);
if(i==len)
{
Out+=base64EncodeChars[c1>>2];
Out+=base64EncodeChars[(c1&0x3)<<4];
Out+="==";
break;
}
c2=str[i++];
if(i==len)
{
Out+=base64EncodeChars[c1>>2];
Out+=base64EncodeChars[((c1&0x3)<<4)|((c2&0xF0)>>4)];
Out+=base64EncodeChars[(c2&0xF)<<2];
Out+="=";
break;
}
c3=str[i++];
Out+=base64EncodeChars[c1>>2];
Out+=base64EncodeChars[((c1&0x3)<<4)|((c2&0xF0)>>4)];
Out+=base64EncodeChars[((c2&0xF)<<2)|((c3&0xC0)>>6)];
Out+=base64EncodeChars[c3&0x3F];
}
returnOut;
}
publicstringutf16to8(stringstr)
{
stringOut="";
inti,len;
charc;//char为16位Unicode字符,范围0~0xffff,感谢vczh提醒
len=str.Length;
for(i=0;i<len;i++)
{//根据字符的不同范围分别转化
c=str[i];
if((c>=0x0001)&&(c<=0x007F))
{
Out+=str[i];
}
elseif(c>0x07FF)
{
Out+=(char)(0xE0|((c>>12)&0x0F));
Out+=(char)(0x80|((c>>6)&0x3F));
Out+=(char)(0x80|((c>>0)&0x3F));
}
else
{
Out+=(char)(0xC0|((c>>6)&0x1F));
Out+=(char)(0x80|((c>>0)&0x3F));
}
}
returnOut;
}
publicstaticstringbase64decode(stringstr)
{//解密
intc1,c2,c3,c4;
inti,len;
stringOut;
len=str.Length;
i=0;Out="";
while(i<len)
{
do
{
c1=base64DecodeChars[str[i++]&0xff];
}while(i<len&&c1==-1);
if(c1==-1)break;
do
{
c2=base64DecodeChars[str[i++]&0xff];
}while(i<len&&c2==-1);
if(c2==-1)break;
Out+=(char)((c1<<2)|((c2&0x30)>>4));
do
{
c3=str[i++]&0xff;
if(c3==61)returnOut;
c3=base64DecodeChars[c3];
}while(i<len&&c3==-1);
if(c3==-1)break;
Out+=(char)(((c2&0XF)<<4)|((c3&0x3C)>>2));
do
{
c4=str[i++]&0xff;
if(c4==61)returnOut;
c4=base64DecodeChars[c4];
}while(i<len&&c4==-1);
if(c4==-1)break;
Out+=(char)(((c3&0x03)<<6)|c4);
}
returnOut;
}
publicstringutf8to16(stringstr)
{
stringOut="";
inti,len;
charc,char2,char3;
len=str.Length;
i=0;while(i<len)
{
c=str[i++];
switch(c>>4)
{
case0:
case1:
case2:
case3:
case4:
case5:
case6:
case7:Out+=str[i-1];break;
case12:
case13:char2=str[i++];
Out+=(char)(((c&0x1F)<<6)|(char2&0x3F));break;
case14:char2=str[i++];
char3=str[i++];
Out+=(char)(((c&0x0F)<<12)|((char2&0x3F)<<6)|((char3&0x3F)<<0));break;
}
}
returnOut;
}
}
}
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