C 之 AES加密原始碼

using

system;
using
system.collections.generic;
using
system.linq;
using
system.web;
using
exam.encryptprivate;
using
system.text;
using
system.security.cryptography;
//////
aes加密、解密，金鑰長度256，金鑰長度不大於32個位元組 
/// 
public
class
aescryptohelper
set 
}private
bool
m_containkey;
//////
true：密文中包含金鑰 
///false：密文中不包含金鑰 
/// 
public
bool
containkey
set 
}public
aescryptohelper()
public aescryptohelper(bool containkey):this
() 
private
string encrypt(string s_crypto, byte key, byte
iv)s_encryped +=byte2hexstring(encrypted);
return
s_encryped;
}catch
(exception ex)
}//////
指定金鑰對明文進行aes加密 
/// 
///明文 
///加密金鑰
///public
string encrypt(string s_crypto, string
s_key)
key =string2byte(s_key.padright(key.length));
iv =string2byte(crypto_iv.padright(iv.length));
return
encrypt(s_crypto, key, iv);
}//////
動態生成金鑰，並對明文進行aes加密 
/// 
///明文 
///public
string encrypt(string
s_crypto)
private
string decrypt(string s_encrypted, byte key, byte
iv)catch
(exception ex)
}//////
從密文中解析出金鑰，並對密文進行解密 
/// 
///密文 
///public
string decrypt(string
s_encrypted)
if(m_containkey)
key =hexstring2byte(s_key);
iv =string2byte(crypto_iv.padright(iv.length));
return
decrypt(s_encrypted, key, iv);
}//////
指定金鑰，並對密文進行解密 
/// 
///密文 
///金鑰 
///public
string decrypt(string s_encrypted, string
s_key)
key =string2byte(s_key.padright(key.length));
iv =string2byte(crypto_iv.padright(iv.length));
if(m_containkey)
return
decrypt(s_encrypted, key, iv);
}private
string byte2hexstring(byte
bytes)
", b);
}return
sb.tostring();
}private
byte hexstring2byte(string
hex)
return
bytes;
}private
byte string2byte(string
str)
private
string byte2string(byte
bytes)
}

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