PHP通用DES加密算法

代码如下

 

class Des_Crypt
{
private key;

function __construct(key)
{
this->key =key;
}

function encrypt(string)
{size = mcrypt_get_block_size('des','ecb');
string = mb_convert_encoding(string, 'GBK', 'UTF-8');
string =this->pkcs5_pad(string,size);
key =this->key;
td = mcrypt_module_open('des', '', 'ecb', '');iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size(td), MCRYPT_RAND);
@mcrypt_generic_init(td, key,iv);
data = mcrypt_generic(td, string);
mcrypt_generic_deinit(td);
mcrypt_module_close(td);data = base64_encode(data);
returndata;
}
function decrypt(string)
{string = base64_decode(string);key =this->key;td = mcrypt_module_open('des','','ecb','');
//使用MCRYPT_DES算法,cbc模式
iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size(td), MCRYPT_RAND);
ks = mcrypt_enc_get_key_size(td);
@mcrypt_generic_init(td,key, iv);
//初始处理decrypted = mdecrypt_generic(td,string);
//解密
mcrypt_generic_deinit(td);
//结束
mcrypt_module_close(td);

result =this->pkcs5_unpad(decrypted);result = mb_convert_encoding(result, 'UTF-8', 'GBK');
returnresult;
}
function pkcs5_pad (text,blocksize)
{
pad =blocksize - (strlen(text) %blocksize);
return text . str_repeat(chr(pad), pad);
}
function pkcs5_unpad(text)
{
pad = ord(text{strlen(text)-1});
if (pad > strlen(text))
{
return false;
}
if (strspn(text, chr(pad), strlen(text) - pad) !=pad)
{
return false;
}
return substr(text, 0, -1 *pad);
}
}
/*
For example:

key = "!@#%test";string1 = "13808080808";
string2 = "这是中文测试";des = new Des_Crypt(key);encryption = des->encrypt(string2);
decryption =des->decrypt(encryption);

echo "原始值：".decryption;
echo "<br />";
echo "加密值：".$encryption;
*/

 

 

 

php中的des加密解密函数简介

 

php中的des加密解密,这里来看两个函数，是关于php的des加密、解密的，这两个函数可以把数据加密成复杂的字符串，如果不解密的话是无法知道未加密前的内容的，可以用des加密实现密码的加密保存之类的操作，php的mde加密和MD5都是加密的好东西。 两个函数如下：

加密函数：encrypt

function encrypt(encrypt,key=”") {
iv = mcrypt_create_iv ( mcrypt_get_iv_size ( MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB ), MCRYPT_RAND );passcrypt = mcrypt_encrypt ( MCRYPT_RIJNDAEL_256, key,encrypt, MCRYPT_MODE_ECB, iv );encode = base64_encode ( passcrypt );
returnencode;
}

 

解密函数：decrypt

function decrypt(decrypt,key=”") {
decoded = base64_decode (decrypt );
iv = mcrypt_create_iv ( mcrypt_get_iv_size ( MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB ), MCRYPT_RAND );decrypted = mcrypt_decrypt ( MCRYPT_RIJNDAEL_256, key,decoded, MCRYPT_MODE_ECB, iv );
returndecrypted;
}

 

 

下面来看这两个函数的实例：

<?php
new = encrypt(“wo shi old”,”111″);old = decrypt(new,”111″);
echonew.”的明文是：”.”<br>”;
echo $old;
?>

 

 

运行的结果为： bnF+S42hS0BzXqMwPJJN82yBa4/DiYoYcTGmt0TotwY=的明文是：wo shi old

 

注：加密或解密时一定要注意key的值，加密后要想解密就必须要知道key的值，不然不能解出正确的明文。